JP5703552B2 - Water treatment system - Google Patents

Description

  The present invention relates to a water treatment system for circulating circulating water or spray water to a cooling tower.

  In commercial buildings, industrial plants, etc., cooling water is used to cool a device to be cooled (cooling load device) such as a heat exchanger represented by an air conditioner or a refrigerator. From the viewpoint of saving the cooling water, the cooling water is circulated and used while being cooled in the cooling tower (hereinafter, the circulating cooling water is also referred to as “circulated water”). The cooling tower can be broadly classified into two types: an open type cooling tower and a closed type cooling tower.

  In general, an open-type cooling tower is a tower main body, an exhaust port, a fan and a sprinkler provided in the upper part of the tower main body, a storage part provided in the lower part of the tower main body, and a passage provided in the side of the tower main body. And pores. A sprinkling part is a site | part which spreads circulating water in order to cool the circulating water which cools a to-be-cooled apparatus. A storage part is a site | part which stores the distribute | circulated circulating water.

  Circulating water circulates between the open-type cooling tower and the apparatus to be cooled via the circulating water supply line and the circulating water recovery line. Specifically, the circulating water is supplied from the cooling tower to the apparatus to be cooled through the circulating water supply line. The supplied circulating water is used for cooling the apparatus to be cooled, and is heated by heat exchange during this cooling. The heated circulating water is recovered to the cooling tower through the circulating water recovery line. Circulating water collected from the device to be cooled is introduced into the water sprinkling part and sprayed from the water sprinkling part. The sprayed circulating water falls to the storage part and is stored.

Further, in the open type cooling tower, when the fan is driven, the outside air flows into the cooling tower through the vent hole and is discharged from the exhaust port. Here, the dispersed circulating water is cooled by touching the air flow generated by the fan, that is, the outside air (air) flowing from the vent hole to the discharge port in the process of falling into the storage portion, and then into the storage portion. Stored.
The circulating water cooled and stored in the storage unit is supplied again to the cooled device via the circulating water supply line, and cools the cooled device. In this way, the circulating water that cools the apparatus to be cooled circulates between the open cooling tower and the apparatus to be cooled.

  On the other hand, the closed cooling tower has a cooling tower internal line in which the circulating liquid for cooling the apparatus to be cooled flows in a sealed state, and a circulating liquid located in the cooling tower internal line, as compared to the open cooling tower. In order to cool the sprayed water, a sprinkling part for spraying the sprayed water to the outside of the internal line of the cooling tower and a storage part for storing the sprayed sprayed water are provided, and the cooling tower is sprayed from the sprinkling part. The main difference is that a spray water line for circulating the spray water stored in the reservoir is connected.

  More specifically, the closed cooling tower generally includes a tower main body, an exhaust port, a fan and a water sprinkling section provided in the upper portion of the tower main body, a cooling tower internal line provided in the tower main body, and a tower main body. The storage part provided in a lower part, and the vent provided in the side part of a tower main body are provided. The cooling tower internal line is a line through which the circulating liquid for cooling the apparatus to be cooled flows in a sealed state. The water sprinkling part is a part for spraying spray water to the outside of the cooling tower internal line in order to cool the circulating liquid located in the cooling tower internal line. A storage part is a site | part which stores the sprayed sprayed water.

  The circulating liquid circulates between the hermetic cooling tower and the apparatus to be cooled through the circulating liquid supply line, the circulating liquid recovery line, and the cooling tower internal line. More specifically, the circulating liquid is supplied from the cooling tower internal line of the cooling tower to the apparatus to be cooled through the circulating liquid supply line. The supplied circulating fluid is used for cooling the apparatus to be cooled, and is heated by heat exchange during this cooling. The heated circulating liquid is recovered to the cooling tower internal line of the cooling tower via the circulating liquid recovery line. In this way, the circulating liquid that cools the apparatus to be cooled circulates between the hermetic cooling tower and the apparatus to be cooled.

On the other hand, in the hermetic cooling tower, the spray water is introduced from the spray water line into the sprinkler. The introduced spray water is sprayed from the sprinkling part to the outside of the cooling tower internal line. The sprayed water sprayed is dropped and stored in the storage part.
Further, when the fan is driven, the outside air flows into the cooling tower through the vent holes and is discharged from the exhaust port. Here, the sprayed sprayed water is cooled by touching the airflow generated by the fan, that is, the outside air (air) flowing from the vent hole to the discharge port in the process of falling into the reservoir, and then into the reservoir. Stored.
The sprayed water that has been cooled and stored in the storage section is reintroduced into the sprinkling section through the sprinkling water line, sprayed from the sprinkling section, and cools the circulating liquid located in the cooling tower internal line. In this way, the spray water for cooling the circulating liquid circulates through the spray water line.

  Further, in a water treatment system including a cooling tower (open cooling tower, closed cooling tower), circulating water or sprayed water is sprayed to circulate the circulating water or sprayed water. Concentrates. Thereby, dissolved salt and a nutrient source come to be contained in high concentration in circulating water or sprayed water. As a result, the quality of the circulating water or sprayed water is deteriorated, slime and algae are generated, and there is a possibility that water permeability is deteriorated and cooling capacity is lowered. In addition, Legionella bacteria may be propagated due to slime or the like, and the propagated Legionella bacteria may be entrained in the evaporated water and scattered in the atmosphere.

  Circulating water or sprayed water generally contains corrosive ions such as chloride ions and scale generating factors such as calcium carbonate and silica. When the water in the circulating water or spray water evaporates, the concentration of corrosive ions and scale generating factors in the circulating water or spray water increases. Accordingly, corrosion is promoted in the tower body and various piping systems (lines), and scale generation is promoted. Moreover, when scale accumulates and adheres to a to-be-cooled apparatus, various piping systems, etc., there exists a possibility of causing the deterioration of water permeability and the cooling capacity.

  Therefore, in the cooling tower, a make-up water line and a drain line are connected to prevent the circulating water or sprayed water from being excessively concentrated (the concentration is increased). Via the make-up water line, make-up water made up of raw water (hard water), softened water and the like is supplied to the storage section of the cooling tower. Moreover, the circulating water or sprayed water stored in the storage part is drained out of the system via the drainage line. Thus, the density | concentration in circulating water or spray water is reduced, and concentration of circulating water or spray water is eliminated.

By the way, in order to prevent generation of slime, algae, scales, etc., it is effective to use softened water for circulating water or sprayed water and to manage the electrical conductivity (control the concentration rate).
However, the softening water generally has hardness components such as calcium ions removed almost completely by a water softening device (water softener). Accordingly, since the softened water does not substantially contain a hardness component, there is a problem that corrosion of the piping system or the like is likely to occur compared to hard water containing the hardness component.

  That is, it is preferable to use softened water as much as possible as circulating water or sprayed water in order to suppress the generation of scale and ensure good water quality of the circulating water or sprayed water. On the other hand, it is sufficient to replenish only the necessary amount of hard water from the viewpoint of suppressing corrosion of piping systems and the like.

  In the patent document 1, the applicant of the present invention is “a cooling tower make-up water quality adjusting device for adjusting the quality of make-up water supplied to the cooling tower, and softens hard water containing a hardness component to generate soft water. A first water supply path connecting the water softener, the water softener and the cooling tower, a second supply path through which hard water connected to the first supply path bypassing the water softener passes, Control means for controlling the inflow of the hard water from the second supply path to the first supply path, and water quality management means for managing the quality of the circulating water circulating through the cooling tower and the apparatus to be cooled. The control means includes inflow permission means for permitting inflow of the hard water into the first supply path according to a water quality state of the circulating water managed by the water quality management means. Disclosed is a water quality adjusting device for cooling tower makeup water.

  In the water quality adjustment device disclosed in Patent Document 1, the water quality management means includes flow rate measurement means for measuring the integrated flow rates of the soft water and the hard water that pass through the first supply path, and the inflow permission means includes: When the integrated flow rate of the soft water has a predetermined value measured by the flow rate measuring means, the predetermined integrated flow rate of the hard water is allowed to flow into the first supply path.

  According to the water quality adjusting device disclosed in Patent Document 1, when the inflow permission unit measures the predetermined value of the integrated flow rate of the soft water by the flow rate measuring unit, the predetermined amount of hard water flowing into the first replenishment path is allowed to flow. To give permission. As a result, generation of slime and scale is suppressed, and corrosion of piping systems and the like is also suppressed.

JP 2009-41844 A

  However, in the water quality adjustment device disclosed in Patent Document 1, the inflow (replenishment) of raw water is controlled based on the integrated flow rate of softened water (soft water) or raw water (hard water) that is measured. Therefore, it is difficult to maintain the hardness in the circulating water at an appropriate height. Therefore, it is desired to more reliably suppress the generation of slime, scale, etc. and the corrosion of piping systems.

  Therefore, an object of the present invention is to provide a water treatment system that can more reliably suppress the generation of slime, scale, and the like, and the corrosion of piping systems and the like.

The present invention is a cooling tower having a sprinkling part for spraying circulating water to cool the circulating water for cooling the apparatus to be cooled, a storage part for storing the cooled circulating water, and the storage part. A circulating water supply line for supplying the circulating water from the cooling tower to the cooled device, and a circulating water recovery line for collecting the circulating water from the cooled device to the sprinkling part of the cooling tower, A circulating water line for circulating circulating water between the cooling tower and the cooled device via a supply line and the circulating water recovery line, an electrical conductivity measuring device for measuring the electrical conductivity of the circulating water, and raw water Raw water makeup water line for replenishing makeup water to any one or more of the water sprinkling section, the storage section, and the circulating water line, and the water sprinkling section for storing the raw water makeup water through the raw water makeup water line And the circulating water line The raw water makeup water circulation means that circulates to any one or more of the above, and softened water makeup water that replenishes softened water makeup water to any one or more of the sprinkling section, the storage section, and the circulating water line A softened water replenishment water distribution means for distributing softened water replenishment water to any one or more of the sprinkling section, the storage section, and the circulating water line via the softening water replenishment water line; When the hardness measuring device for measuring the hardness of the circulating water and the electrical conductivity measured by the electrical conductivity measuring device is equal to or greater than a preset threshold value, the raw water makeup water circulating by the raw water makeup water circulating means or When the flow of the softened water replenishment water by the softened water replenishment water circulation means is continued and the electrical conductivity measured by the electrical conductivity measuring device is less than a preset threshold, the raw water replenishment water flow means Raw water supply Or a concentration determination unit for stopping the circulation of the softened water makeup water by the softened water makeup water circulation means, and the raw water by the raw water makeup water circulation means based on the hardness of the circulating water measured by the hardness measuring device Flow rate control means for controlling the flow rate of makeup water and / or the flow rate of softened water makeup water by the softened water makeup water circulation means, and the hardness measuring device measures calcium hardness as hardness, and the flow rate control means Controls the softened water makeup water circulation means to stop the circulation of the softened water makeup water when the calcium hardness of the circulating water measured by the hardness measuring device becomes lower than a predetermined lower threshold. relates to a water treatment system that controls the raw makeup water flowing means so as to start the flow of raw water makeup water.

  Further, the flow rate control means is configured to stop the flow of the raw water makeup water when the calcium hardness of the circulating water measured by the hardness measuring device is higher than a predetermined upper limit threshold. It is preferable to control the softened water makeup water circulation means so as to start the circulation of the softened water makeup water.

The present invention includes a cooling tower internal line in which the circulating liquid for cooling the apparatus to be cooled flows in a sealed state, and spray water to the outside of the cooling tower internal line for cooling the circulating liquid located in the cooling tower internal line. A cooling tower having a sprinkling part for spraying and a storage part for storing the sprayed sprayed water, and a circulating liquid supply line for supplying a circulating liquid located in the cooling tower internal line from the cooling tower to the cooled apparatus. A circulating fluid recovery line for recovering the circulating fluid from the cooled device to the cooling tower internal line of the cooling tower, and through the circulating fluid supply line, the circulating fluid recovery line, and the cooling tower internal line, A circulating liquid line that circulates a circulating liquid between a cooling tower and the apparatus to be cooled, and a sprayer that is connected to the storage unit and connected to the watering unit, sprayed from the watering unit, and stored in the storage unit Circulate water Raw water for replenishing at least one of the sprinkling water line, the electric conductivity side hand device for measuring the electric conductivity of the sprinkling water, and the raw water replenishment water to the sprinkling part, the storage part and the sprinkling water line Softening water line, raw water replenishment water distribution means for distributing raw water replenishment water to any one or more of the sprinkling part, the storage part and the spray water line via the raw water replenishment water line, and softening A softened water replenishment water line that replenishes one or more of the water replenishment water, the storage section, and the spray water line, and the softened water replenishment water through the softened water replenishment water line. A softened water replenishment water flow means for flowing toward any one or more of the storage section, the storage section and the spray water line, a hardness measurement device for measuring the hardness of the spray water, and the electrical conductivity measurement device. Measured electrical conduction Is greater than or equal to a preset threshold value, the raw water makeup water circulation means by the raw water makeup water circulation means or the softening water makeup water circulation by the softened water makeup water circulation means is continued, and the electrical conductivity measuring device When the measured electrical conductivity is less than a preset threshold value, the concentration for stopping the flow of the raw water makeup water by the raw water makeup water circulation means or the circulation of the softened water makeup water by the softened water makeup water circulation means Based on the hardness of the spray water measured by the determination unit and the hardness measuring device, the flow rate of the raw water makeup water by the raw water makeup water circulation means and / or the flow rate of the softened water makeup water by the softened water makeup water circulation means A flow rate control means for controlling , the hardness measuring device measures calcium hardness as hardness, and the flow rate control means measures the calcium hardness of the spray water measured by the hardness measuring device. When the degree becomes lower than a predetermined lower threshold, the softened water makeup water circulation means is controlled to stop the circulation of the softened water makeup water, and the raw water replenishment is started so as to start the circulation of the raw water makeup water. that controls the water flow means on water treatment system.

  Further, the flow rate control means is configured to stop the flow of the raw water make-up water when the calcium hardness of the spray water measured by the hardness measuring device becomes higher than a predetermined upper limit threshold. It is preferable to control the softened water makeup water circulation means so as to start the circulation of the softened water makeup water.

  ADVANTAGE OF THE INVENTION According to this invention, the water treatment system which can perform more reliably suppression of generation | occurrence | production of a slime, a scale, etc. and suppression of corrosion of a piping system etc. can be provided.

It is a schematic structure figure showing water treatment system 100 of a 1st embodiment of the present invention. It is a functional block diagram concerning control of water treatment system 100 of a 1st embodiment. It is a flowchart which shows operation | movement of the water treatment system 100 of 1st Embodiment. It is a schematic block diagram which shows the water treatment system 200 of 2nd Embodiment of this invention. It is a functional block diagram concerning control of water treatment system 200 of a 2nd embodiment. It is a flowchart which shows operation | movement of the water treatment system 200 of 2nd Embodiment. It is a figure which shows the 1st modification regarding the replenishment position of the raw | natural water replenishment water W121 and softened water replenishment water W122 in 1st Embodiment. It is a figure which shows the 2nd modification regarding the replenishment position of the raw | natural water replenishment water W121 and softened water replenishment water W122 in 1st Embodiment. It is a figure which shows the 3rd modification regarding the replenishment position of the raw | natural water replenishment water W121 and softened water replenishment water W122 in 1st Embodiment. It is a figure which shows the 4th modification regarding the replenishment position of the raw | natural water replenishment water W121 and softened water replenishment water W122 in 1st Embodiment. It is a figure which shows the 5th modification regarding the replenishment position of the raw water supplementary water W121 and softened water supplementary water W122 in 1st Embodiment. It is a figure which shows the 6th modification regarding the replenishment position of the raw | natural water replenishment water W121 and softened water replenishment water W122 in 1st Embodiment.

<First Embodiment>
With reference to FIG. 1, the outline of the water treatment system 100 of 1st Embodiment of this invention is demonstrated. FIG. 1 is a schematic configuration diagram illustrating a water treatment system 100 according to a first embodiment of the present invention.

  As shown in FIG. 1, the water treatment system 100 of 1st Embodiment has the cooling tower 110, and to-be-cooled, such as a heat exchanger represented by an air conditioner or a refrigerator, in a commercial building, an industrial plant, etc. In order to cool the device 131, the cooling water is circulated. From the viewpoint of saving the cooling water, the cooling water is circulated and used while being cooled in the cooling tower 110 (hereinafter, the circulating cooling water is also referred to as “circulated water W110”). The cooling tower 110 in the first embodiment is a so-called open type cooling tower.

  The water treatment system 100 of the first embodiment circulates the circulating water W110 between the cooling tower 110 having the storage portion 116 for the circulating water W110, the cooled device 131, and the cooling tower 110 and the cooled device 131. Water line L110, makeup water line L120 for replenishing replenishment water W120 to storage section 116 of cooling tower 110, and circulating water W110 are forcibly discharged out of water treatment system 100 from storage section 116 of cooling tower 110. The drain line L130, the overflow line L140 that discharges the circulating water W110 overflowing from the storage part 116 of the cooling tower 110, the electrical conductivity measuring device 133 that measures the electrical conductivity of the circulating water W110, and the hardness of the circulating water W110 are measured. Mainly comprising a hardness measuring device 134 and a system control device 101 for controlling each part of the water treatment system 100 It is configured Te.

The circulating water line L110 includes a circulating water supply line L111 that supplies the circulating water W110 stored in the storage unit 116 from the cooling tower 110 to the cooled device 131, and a sprinkling unit of the cooling tower 110 that supplies the circulating water W110 from the cooled device 131. And a circulating water recovery line L112 for recovery to 112.
“Line” is a general term for lines that allow the flow of objects such as flow paths, paths, and pipelines.

  The cooling tower 110 in 1st Embodiment is demonstrated. The cooling tower 110 cools the circulating water W <b> 110 for cooling the cooled device 131 before supplying it to the cooled device 131. The cooling tower 110 includes a tower main body 111, a water sprinkling unit 112, a storage unit 116, a louver 118, a fan 120, an upper opening 121, and a fan driving unit 122.

  The tower main body 111 forms an outline of the cooling tower 110. A plurality of sprinklers 112, a fan 120, an upper opening 121, and a fan driving unit 122 are provided on the top of the tower body 111. A storage part 116 is provided in the lower part of the tower body 111. A louver 118 is provided on the side of the tower body 111.

  The water sprinkling unit 112 is a part that sprays the circulating water W110 in order to cool the circulating water W110 that cools the apparatus to be cooled 131. The sprinkler 112 spreads (sprinkles) the circulating water W110 recovered from the cooled device 131 through the circulating water recovery line L112 into the tower body 111.

  The watering part 112 includes an upper water tank 113 and a watering port 114. A circulating water recovery line L112 of the circulating water line L110 is connected to the upper water tank 113. The upper water tank 113 stores the circulating water W110 recovered from the cooled device 131 via the circulating water recovery line L112. The water spout 114 is composed of a nozzle formed on the lower side of the upper water tank 113 in order to spray the circulating water W110 stored in the upper water tank 113.

  A filler (not shown) is provided below the sprinkler 112 inside the tower body 111. The filling material drops the circulating water W110 sprayed from the water sprinkling part 112 to increase the contact area and the contact time between the circulating water W110 and the outside air E1 (described later), thereby efficiently cooling the circulating water W110. Provided for.

  The storage unit 116 stores the circulating water W110 sprayed from the sprinkling unit 112. The storage part 116 is provided in the lower part of the tower main body 111. As will be described later, the circulating water W <b> 110 stored in the storage unit 116 is cooled in the process of falling inside the tower body 111. A circulating water supply line L111 and a drainage line L130 of the circulating water line L110 are connected to the bottom of the storage unit 116. The circulating water W110 stored in the storage unit 116 is supplied to the cooled apparatus 131 via the circulating water supply line L111. In addition, the circulating water W110 stored in the storage unit 116 is discharged out of the water treatment system 100 via the drainage line L130.

  The louver 118 is a ventilation hole for introducing outside air (air) E1 to the inside of the tower body 111, and communicates the outside and the inside of the tower body 111. Air (outside air) E <b> 1 outside the tower main body 111 can flow into the tower main body 111 through the louver 118.

  The upper opening 121 is an opening formed in the upper part of the tower main body 111 and is provided for discharging the air E <b> 1 located inside the tower main body 111 to the outside of the tower main body 111. The discharged air is also referred to as “exhaust E2.”

  The fan 120 is disposed in the upper opening 121. The rotation shaft 120a of the fan 120 is disposed so as to extend in the vertical direction. The fan 120 causes the outside air (air) E1 to flow into the inside of the tower body 111 from the louver 118 and exhausts the air E1 located inside the tower body 111 to the outside of the tower body 111 through the upper opening 121. To generate airflow.

  The fan drive unit 122 is composed of a motor or the like and rotationally drives the fan 120. The fan drive unit 122 is disposed above the fan 120 and is connected to the rotating shaft 120 a of the fan 120. The fan drive unit 122 starts or stops the rotational drive of the fan 120, adjusts the rotational speed (shift), and the like.

  In addition to the circulating water line L110 and the drainage line L130, the cooling tower 110 is connected with a makeup water line L120 (raw water makeup water line L122, softened water makeup water line L123) and an overflow line L140. Through each of these lines, circulating water W110 is introduced into or discharged from cooling tower 110, and makeup water W120 (raw water makeup water W121, softened water makeup water W122) is supplemented.

  The circulating water line L110 is a line for circulating the circulating water W110 between the cooling tower 110 and the apparatus to be cooled 131. The circulating water line L110 includes a circulating water supply line L111 that supplies the circulating water W110 stored in the storage unit 116 from the cooling tower 110 to the cooled device 131, and a sprinkling unit of the cooling tower 110 that supplies the circulating water W110 from the cooled device 131. And a circulating water recovery line L112 for recovery to 112. The circulating water line L110 circulates the circulating water W110 between the cooling tower 110 and the cooled apparatus 131 via the circulating water supply line L111 and the circulating water recovery line L112.

The circulating water supply line L111 connects the storage unit 116 of the cooling tower 110 and the apparatus to be cooled 131. The circulating water supply line L111 can supply the circulating water W110 stored in the storage unit 116 to the cooled device 131.
A circulating water pump 132 is connected in the middle of the circulating water supply line L111. The circulating water pump 132 can send out the circulating water W110 from the upstream side to the downstream side of the circulating water line L110 (the circulating water supply line L111, the circulating water recovery line L112).

  The circulating water recovery line L112 connects the apparatus to be cooled 131 and the sprinkler 112 of the cooling tower 110. The circulating water recovery line L <b> 112 can recover the circulating water W <b> 110 heated by heat exchange in the apparatus to be cooled 131 to the sprinkler 112 of the cooling tower 110. The downstream side of the circulating water recovery line L112 branches into a plurality of lines at the recovery branch part J111. In the circulating water recovery line L112, a line upstream from the recovery branch part J111 is also referred to as an “upstream circulating water recovery line L112a”, and a plurality of lines downstream from the recovery branch part J111 are referred to as “downstream circulating water recovery line”. Also referred to as “L112b”. The downstream ends of the plurality of downstream circulating water recovery lines L112b are connected to the plurality of sprinklers 112, respectively.

  The apparatus to be cooled 131 is various apparatuses such as a heat exchanger that needs to be cooled by the circulating water W110. For example, turbo chillers and absorption chillers of various chemical plants, air conditioner coolers of buildings, and cold water of food factories. Manufacturing machines and vacuum coolers. The to-be-cooled apparatus 131 has a required circulating water flow path (not shown). This circulating water flow path has a circulating water introduction part 131a and a circulating water discharge part 131b.

  And the downstream edge part of the circulating water supply line L111 is connected to the circulating water introduction part 131a. The upstream end of the circulating water recovery line L112 is connected to the circulating water discharge part 131b. Thus, the circulating water flow path forms a circulation path for circulating the circulating water W110 between the tower main body 111 of the cooling tower 110 and the cooled device 131 together with the circulating water supply line L111 and the circulating water recovery line L112. doing.

  The electrical conductivity measuring device 133 is a device that measures the electrical conductivity of the circulating water W110. The electrical conductivity measuring device 133 is connected to the circulating water line L110. Specifically, a measurement connection portion J112 is provided between the circulating water pump 132 and the cooled device 131 in the circulating water supply line L111. The electrical conductivity measuring device 133 is connected to the circulating water supply line L111 at the measurement connection portion J112 via the measurement line L113.

  By the way, when the concentration of circulating water W110 increases, the concentration of corrosive ions and scale generation factors increases. Thereby, the electrical conductivity of circulating water W110 becomes high. Therefore, in the water treatment system 100, when the electrical conductivity measured by the electrical conductivity measuring device 133 is higher than a predetermined threshold, the concentration of the circulating water W110 is decreased (the electrical conductivity is reduced). In order to reduce the supply water W120, the supply water W120 is supplied to the storage unit 116 of the cooling tower 110, and the circulating water W110 stored in the storage unit 116 is diluted. In this way, the concentration of the circulating water W110 is managed based on the electrical conductivity of the circulating water W110.

  The hardness measuring device 134 is a device that measures the hardness of the circulating water W110. The hardness measuring device 134 may be capable of measuring the total hardness or may be capable of measuring only the calcium hardness. The hardness measuring device 134 is connected to the circulating water line L110. Specifically, the hardness measuring device 134 is connected to the circulating water supply line L111 at the measurement connection portion J112 via the measurement line L113.

As the hardness measuring device 134, for example, a colorimetric sensor that detects hardness by color development when a reagent containing a dye is added is used. The colorimetric sensor adds a reagent to a transparent container containing a predetermined amount of sample water, and measures the hue change of the sample water due to the reaction of the dye from the absorbance when irradiated with light of a specific wavelength. Then, the colorimetric sensor determines the hardness in the sample water based on the measured absorbance.
The hardness measuring device 134 is not limited to a colorimetric sensor, and may be an electrode sensor, a titration sensor, or the like.

The makeup water line L120 is a line for replenishing the makeup water W120 to the storage section 116 of the cooling tower 110. The makeup water line L120 includes a source-side makeup water line L121, a makeup water branch J121, a raw water makeup water line L122, and a softened water makeup water line L123.
The makeup water branch portion J121 is a portion where the raw water makeup water line L122 and the softened water makeup water line L123 are branched from the source flow side makeup water line L121.

  The upstream side of the source-side makeup water line L121 is connected to a supply source (not shown) of makeup water W120 made of raw water such as tap water or industrial water. The downstream side of the source-side makeup water line L121 is connected to the makeup water branch J121. The supply water W120 supplied from the supply source of the makeup water W120 flows through the source-side makeup water line L121.

  A makeup water pump 141 and a makeup water valve 142 are connected to the source flow side makeup water line L121 in order from the upstream side. The makeup water pump 141 can send makeup water W120 from the upstream side to the downstream side of the makeup water line L120 (source-side makeup water line L121, raw water makeup water line L122, softened water makeup water line L123). The makeup water valve 142 can open and close the source flow side makeup water line L121 between the makeup water branch J121 and the makeup water pump 141.

  The upstream end of the raw water makeup water line L122 is connected to the source flow side makeup water line L121 via a makeup water branch J121. In the raw water replenishment water line L122, replenishment water W120 is introduced and circulated through the source-side replenishment water line L121 and the replenishment water branch J121. The replenishment water W120 flowing through the raw water replenishment water line L122 is the same as the replenishment water W120 flowing through the source flow side replenishment water line L121. However, for convenience of explanation, the replenishment water W120 flowing through the source flow replenishment water line L121 is used. Also referred to as “raw water replenishment water W121”.

The raw water supply water line L122 is a line for supplying the raw water supply water W121 to the storage unit 116 of the cooling tower 110. An end 153 on the downstream side of the raw water replenishing water line L122 is connected to the tower main body 111 of the cooling tower 110, and is spaced above the storage part 116.
An auxiliary raw water makeup water valve 151 and a raw water makeup water valve 152 are connected to the raw water makeup water line L122 in order from the upstream side.

The auxiliary raw water replenishing water valve 151 is normally open, but is closed when the raw water replenishing water valve 152 is maintained.
The raw water replenishing water valve 152 is composed of a control valve. The raw water makeup water valve 152 can open and close the raw water makeup water line L122 between the downstream end 153 of the raw water makeup water line L122 and the makeup water branch J121 (auxiliary raw water makeup water valve 151). In the present embodiment, “a raw water makeup water distribution means for circulating the raw water makeup water W121 toward the storage section 116 via the raw water makeup water line L122” is configured from the makeup water pump 141, the raw water makeup water valve 152, and the like. Yes.

The softened water supply water line L123 is a line for supplying the softened water supply water W122 to the storage unit 116 of the cooling tower 110. A softening device 143 and a softening water replenishing water valve 144 are connected to the softening water replenishing water line L123 in order from the upstream side.
The upstream end portion of the softened water makeup water line L123 is connected to the source flow side makeup water line L121 via a makeup water branch portion J121. The downstream end of the softened water replenishment water line L123 is connected to the tower main body 111 of the cooling tower 110 and is located away from the bottom of the storage part 116.

  A ball tap type faucet 145 for managing the water level of the circulating water W110 stored in the storage unit 116 is provided at the downstream end of the softened water replenishment water line L123. When the water level of the circulating water W110 stored in the storage unit 116 decreases, the water tap 145 operates so that the ball tap operates and the softened water replenishment water W122 flowing through the softened water replenishment water line L123 is replenished to the storage unit 116. It is configured.

  The water softening device 143 is a device that softens the makeup water W120 made of raw water (hard water) and generates (obtains) the softened water makeup water W122. The water softening device 143 is a device that reduces (removes) hardness components contained in the makeup water W120, specifically, calcium ions and magnesium ions, and generates the softening water makeup water W122 from the makeup water W120 made of raw water. is there.

Softened water refers to water that is obtained (generated) by subjecting raw water (hard water) to water softening and has reduced hardness. Softened water also includes pure water obtained (generated) by subjecting raw water (hard water) to a pure water treatment. That is, the softened water includes pure water, and the water softening treatment includes pure water treatment.
The softened water preferably has a hardness reduced to 10 mg / L or less, and more preferably has a hardness reduced to 1 mg / L or less.

  The water softening device 143 is not particularly limited as long as the water softening treatment can be performed. As the water softening device 143, a cation exchange device that performs cation exchange using an ion exchange resin and performs water softening treatment, and performs water softening treatment by performing cation exchange and anion exchange using an ion exchange resin. Ion exchange device, reverse osmosis membrane device that performs filtration and softening using reverse osmosis membrane (RO membrane), electrodialysis device (electric deionization device) that performs water softening treatment using electrodialysis, etc. Is mentioned.

  The softened water replenishment water valve 144 is composed of a control valve. The softened water replenishment water valve 144 can open and close the softened water replenishment water line L123 between the downstream end of the softened water replenishment water line L123 and the water softening device 143. In the present embodiment, “softened water makeup water distribution means for distributing the softened water makeup water W122 toward the storage section 116 via the softened water makeup water line L123” from the makeup water pump 141, the softened water makeup water valve 144, and the like. Is configured.

  The drain line L130 is connected to the bottom of the storage part 116 and extends downward. The drainage line L130 discharges the circulating water W110 stored in the storage unit 116 to the outside of the water treatment system 100 as the drainage W130. A drain valve 161 is connected in the middle of the drain line L130. An overflow line L140 (described later) is connected to the downstream side of the drain valve 161 in the drain line L130 via a drainage junction J131. The drain valve 161 is composed of a control valve. The drainage valve 161 can open and close the drainage line L130 between the storage part 116 and the drainage junction part J131.

  The overflow line L140 is a line for discharging the circulating water W110 overflowing from the storage unit 116 to the outside of the water treatment system 100 as drainage W130. The upstream end portion 162 of the overflow line L140 is located at a position spaced upward from the storage portion 116 of the cooling tower 110. The overflow line L140 is connected (joined) with the drainage line L130 at the drainage junction J131.

Circulating water W110 overflowing from the reservoir 116 flows into the overflow line L140 from the upstream end 162 of the overflow line L140. The circulating water W110 that has flowed into the overflow line L140 flows into the drainage line L130 via the drainage junction J131 and is discharged out of the water treatment system 100.
In the present embodiment, the drainage valve 161 constitutes “a drainage circulation means for circulating the circulating water W110 stored in the reservoir 116 via the drainage line L130 toward the outside of the system”.

Next, with reference to FIG. 2, the function which concerns on control of the water treatment system 100 of 1st Embodiment is demonstrated. FIG. 2 is a functional block diagram relating to control of the water treatment system 100 of the first embodiment.
The system control apparatus 101 controls each unit in the water treatment system 100 of the first embodiment. As shown in FIG. 2, the system control apparatus 101 is electrically connected to, for example, a makeup water pump 141, a softened water makeup water valve 144, a raw water makeup water valve 152, a drain valve 161, and a fan drive unit 122.

  The system control device 101 is electrically connected to each measurement device in the water treatment system 100 and receives measurement information from each measurement device. For example, the system control apparatus 101 is electrically connected to the electrical conductivity measuring device 133 and receives electrical conductivity information measured by the electrical conductivity measuring device 133. The system control device 101 is electrically connected to the hardness measuring device 134 and receives hardness information measured by the hardness measuring device 134.

  The system control apparatus 101 includes a control unit 102. The control unit 102 includes a concentration determination unit 181, a hardness determination unit 182, and a makeup water control unit 183 as a flow rate control unit.

  The concentration determination unit 181 determines whether or not the electrical conductivity of the circulating water W110 measured by the electrical conductivity measuring device 133 is equal to or greater than a predetermined threshold value. As the predetermined threshold, for example, an upper limit electric conductivity that can ensure suppression of slime generation is set.

  The hardness determination unit 182 determines whether the hardness of the circulating water W110 measured by the hardness measuring device 134 is lower than a predetermined lower limit threshold or higher than a predetermined upper limit threshold.

  The makeup water control unit 183, when the concentration determination unit 181 determines that the electrical conductivity of the circulating water W110 is equal to or greater than a predetermined threshold, the makeup water pump 141, the softened water makeup water valve 144, and the raw water makeup water valve. 152, the drain valve 161, the fan drive unit 122, and the like are controlled. Under the control of the makeup water controller 183, makeup water W120 (raw water makeup water W121, softened water makeup water W122) is replenished to the storage section 116 of the cooling tower 110.

  Further, the makeup water control unit 183 controls the flow rate of the raw water makeup water W121 by the raw water makeup water circulation means (the makeup water pump 141, the raw water makeup water valve 152) based on the hardness of the circulating water W110 measured by the hardness measuring device 134. And / or controlling the flow rate of the softened water replenishment water W122 by the softened water replenishment water circulation means (replenishment water pump 141, softened water replenishment water valve 144).

  For example, the makeup water control unit 183 causes the softened water to stop the circulation of the softened water makeup water W122 when the hardness of the circulating water W110 measured by the hardness measuring device 134 is lower than a predetermined lower threshold. The replenishing water distribution means is controlled, and the raw water replenishment water distribution means is controlled to start distribution of the raw water replenishment water W121.

  In addition, the makeup water control unit 183 is configured to stop the circulation of the raw water makeup water W121 when the hardness of the circulating water W110 measured by the hardness measuring device 134 is higher than a predetermined upper limit threshold. The distribution means is controlled, and the softened water makeup water circulation means is controlled to start distribution of the softened water makeup water W122.

  As described above, it is preferable to use softened water as much as possible as the circulating water (or sprayed water) in order to suppress the generation of scale and ensure the good quality of the circulating water (or sprayed water). On the other hand, it is sufficient to replenish only the necessary amount of hard water from the viewpoint of suppressing corrosion of piping systems and the like.

  In view of this, the circulating water W110 has a predetermined range of hardness required to obtain a corrosion inhibiting effect. The predetermined range is set, for example, to a range from a predetermined lower limit threshold to a predetermined upper limit threshold. The hardness of the circulating water W110 has a hardness necessary for obtaining a corrosion inhibiting effect and a necessary hardness for suppressing the occurrence of scale when the hardness is within a range from a predetermined lower threshold to a predetermined upper threshold in a predetermined range. It is preferable to have. The predetermined lower limit threshold of the predetermined range is a lower limit threshold for obtaining the necessary hardness of the circulating water W110 necessary for obtaining the corrosion inhibiting effect. The predetermined upper limit threshold of the predetermined range is set to be higher than the predetermined lower limit threshold of the predetermined range, and obtains a hardness necessary for obtaining a corrosion inhibiting effect and a required hardness for suppressing the occurrence of scale. Any upper threshold may be used. Since it is sufficient to supply only the necessary amount of hard water, it is preferable that the upper limit threshold of the predetermined range of the circulating water W110 is set to a value close to the predetermined lower limit threshold of the predetermined range.

When the hardness of the circulating water W110 is higher than a predetermined upper limit threshold value, the circulating water W110 is recognized as having a hardness necessary for obtaining a corrosion inhibiting effect. The replenishment of the raw water replenishment water W121 is stopped by controlling the raw water replenishment water circulation means, and the replenishment of the softened water replenishment water W122 is started or continued by controlling the softened water replenishment water circulation means.
On the other hand, when the hardness of the circulating water W110 is lower than a predetermined lower limit threshold value, the circulating water W110 is recognized as not having the hardness necessary for obtaining the corrosion inhibiting effect, so the makeup water control unit 183 The replenishment of the softened water replenishment water W122 is stopped by controlling the softened water replenishment water distribution means, and the replenishment of the raw water replenishment water W121 is started or continued by controlling the raw water replenishment water distribution means.
In addition, when the hardness of the circulating water W110 is within the range from the predetermined lower limit threshold to the predetermined upper limit threshold, the circulating water W110 has a hardness necessary for obtaining a corrosion inhibiting effect and generation of scale. Therefore, the makeup water control unit 183 stops the replenishment of the raw water makeup water W121 and the softened water makeup water W122.

Next, with reference to FIG.1 and FIG.2, operation | movement of the water treatment system 100 of 1st Embodiment is demonstrated.
When the circulating water pump 132 is operated, the circulating water W110 stored in the storage unit 116 of the cooling tower 110 moves from the upstream side to the downstream side of the circulating water line L110 (the circulating water supply line L111 and the circulating water recovery line L112). Sent out.

  Specifically, the circulating water W110 is supplied to the cooled apparatus 131 via the circulating water supply line L111. The circulating water W110 passes through the circulating water flow path from the circulating water introduction part 131a of the cooled apparatus 131, cools the cooled apparatus 131, and is discharged from the circulating water discharge part 131b to the circulating water recovery line L112.

  The circulating water W110 discharged to the circulating water recovery line L112 is introduced into the upper water tank 113 of the sprinkler 112. Circulating water W <b> 110 introduced into the upper water tank 113 is sprayed from the sprinkling port 114 to the inside of the tower main body 111. As shown by the dotted line in FIG. 1, the dispersed circulating water W <b> 110 falls inside the tower body 111 and is received by the storage unit 116. In this manner, the circulating water W110 stored in the storage unit 116 circulates through the circulating water line L110, the sprinkling unit 112, and the like.

  In the cooling tower 110, the fan controller 122 is operated by the system controller 101 to rotate the fan 120. As a result, outside air (air) E1 flows into the tower main body 111 through the louver 118. The air E1 passes through the inside of the tower main body 111, and is discharged from the upper opening 121 to the outside of the tower main body 111 as exhaust E2.

  The circulating water W110 falling inside the tower main body 111 is cooled by touching the outside air E1 flowing into the tower main body 111. The circulating water W110 thus cooled and returned (falling) to the storage unit 116 is supplied again to the cooled device 131 via the circulating water supply line L111 and sprinkled through the cooling tower 110 via the circulating water recovery line L112. Return to section 112. Therefore, the circulating water W110 stored in the storage unit 116 functions as cooling water that circulates the circulating water supply line L111, the circulating water flow path of the cooling target device 131 and the circulating water recovery line L112, and cools the cooling target device 131. To do.

  In addition, when the concentration of the circulating water W110 is proceeding, in order to eliminate the concentration of the circulating water W110 and suppress the generation of slime, algae, etc., the replenishing water W120 (raw water replenishment) is supplied to the storage unit 116 of the cooling tower 110. Water W121 and softened water makeup water W122) are replenished.

  Specifically, in the water treatment system 100 of the first embodiment, the concentration determination unit 181 determines that the circulating water W110 is concentrated based on the electrical conductivity measured by the electrical conductivity measuring device 133. In this case, the make-up water control unit 183 controls the make-up water pump 141, the softened water make-up water valve 144, the raw water make-up water valve 152, and the like, and stores the cooling tower 110 through the make-up water line L120. Replenishment water W120 (softened water makeup water W122 or raw water makeup water W121) is replenished to 116. Further, the makeup water control unit 183 controls the drain valve 161 almost simultaneously with the replenishment of the makeup water W120, and the circulating water W110 stored in the storage unit 116 is connected to the system of the water treatment system 100 via the drain line L130. Drain out.

  Since the raw water replenishment water W121 is not softened and contains a hardness component which is a scale generation factor, it is preferable not to use it as the circulating water W110 as much as possible. Therefore, at the time of normal replenishment, the softened water replenishment water W122 is replenished to the storage unit 116. On the other hand, since the raw water replenishment water W121 containing a hardness component has a corrosion suppressing effect, it is necessary to replenish the storage unit 116 with the raw water replenishing water W121 to the extent that the corrosion suppressing effect can be secured.

  More specifically, when the hardness measured by the hardness measuring device 134 is higher than a predetermined threshold (hereinafter referred to as “required hardness”), it is not necessary to replenish the hardness component. Then, the softened water replenishment water W122 is replenished. Here, the auxiliary raw water replenishing water valve 151 will be described as being always open.

  Specifically, in a state where the makeup water valve 142 is opened and the raw water makeup water valve 152 is closed, the makeup water control unit 183 operates the makeup water pump 141 and opens the softened water makeup water valve 144. Thereby, the makeup water W120 made of raw water is supplied to the water softening device 143 through the source-side makeup water line L121, the makeup water branch J121, and the softened water makeup water line L123. As a result, the makeup water W120 is softened water supplemented water W122 made of softened water by removing the hardness component in the water softening device 143. The softened water replenishment water W122 is replenished from the water softening device 143 to the storage unit 116 of the cooling tower 110 via the softened water replenishment water line L123 and the softened water replenishment water valve 144 and stored.

  The make-up water control unit 183 opens the drain valve 161 almost simultaneously with the replenishment of the softened water make-up water W122 to the storage unit 116, and performs water treatment of the circulating water W110 stored in the storage unit 116 via the drain line L130. The system 100 is discharged out of the system.

  Thereafter, if the concentration determination unit 181 determines that the circulating water W110 is not concentrated based on the electrical conductivity measured by the electrical conductivity measuring device 133, the makeup water control unit 183 The supply water W120 (softened water supply water W122 and raw water supply water is supplied to the storage unit 116 of the cooling tower 110 via the supply water line L120 by controlling the pump 141, the softened water supply water valve 144, the raw water supply water valve 152, and the like. The supply of W121) is stopped. Almost simultaneously with the stoppage of the replenishment of the makeup water W120, the makeup water control unit 183 closes the drain valve 161, and the circulating water W110 (including the raw water makeup water W121 and the softened water makeup water W122) from the storage unit 116. The discharge of the water treatment system 100 out of the system is stopped. As a result, the concentration of the circulating water W110 in the storage unit 116 is reduced.

  By the way, if the replenishment of the softened water replenishment water W122 is repeated, the hardness of the recirculation water W110 decreases even if the concentration due to the evaporation of the recirculation water W110 is taken into account, and eventually becomes less than the required hardness. In this case, since the corrosion inhibitory effect cannot be sufficiently obtained, it is necessary to supplement the circulating water W110 with a hardness component to increase the hardness of the circulating water W110.

  More specifically, the makeup water control unit 183 closes the softened water makeup water valve 144 and opens the raw water makeup water valve 152. As a result, the storage unit 116 is supplied with the raw water supply water W121 instead of the softened water supply water W122.

  Specifically, the makeup water control unit 183 operates the makeup water pump 141 and opens the raw water makeup water valve 152 in a state where the makeup water valve 142 is opened and the softened water makeup water valve 144 is closed. Thereby, the replenishment water W120 made of raw water is replenished to the storage unit 116 of the cooling tower 110 as the raw water replenishment water W121 via the source flow side replenishment water line L121, the replenishment water branch part J121, and the raw water replenishment water line L122. Is done.

  The make-up water control unit 183 opens the drain valve 161 almost simultaneously with the replenishment of the raw water make-up water W121 to the storage unit 116, and supplies the circulating water W110 stored in the storage unit 116 to the water treatment system via the drain line L130. 100 out of the system.

  Thereafter, if the concentration determination unit 181 determines that the circulating water W110 is not concentrated based on the electrical conductivity measured by the electrical conductivity measuring device 133, the makeup water control unit 183 The supply water W120 (softened water supply water W122 and raw water supply water is supplied to the storage unit 116 of the cooling tower 110 via the supply water line L120 by controlling the pump 141, the softened water supply water valve 144, the raw water supply water valve 152, and the like. The supply of W121) is stopped. Almost simultaneously with the stoppage of the replenishment of the makeup water W120, the makeup water control unit 183 closes the drain valve 161, and the circulating water W110 (including the raw water makeup water W121 and the softened water makeup water W122) from the storage unit 116. The discharge of the water treatment system 100 out of the system is stopped. As a result, the hardness of the circulating water W110 in the storage unit 116 is increased, and as a result, the hardness of the circulating water W110 flowing through the circulating water line L110 is increased.

  The softened water replenishment water W122 and the raw water replenishment water W121 stored in the storage unit 116 are combined with the circulating water W110 stored in the storage unit 116, and used as the circulating water W110 for cooling the cooled device 131. 131.

  In this way, the circulation necessary for obtaining the corrosion suppression effect by controlling the supply (distribution) of the makeup water W120 (softened water makeup water W122, raw water makeup water W121) based on the hardness of the circulation water W110. While ensuring the hardness of the water W110, it is possible to suppress the generation of scale.

  Next, the 1st Example of operation | movement of the water treatment system 100 of 1st Embodiment is demonstrated, referring FIG. In the first embodiment, the flow rate of the raw water makeup water W121 and / or the flow rate of the softened water makeup water W122 is controlled based on the calcium hardness. FIG. 3 is a flowchart showing the operation of the water treatment system 100 of the first embodiment.

  In the first embodiment, the makeup water control unit 183 determines that the circulating water W110 is concentrated by the concentration determination unit 181 based on the electrical conductivity measured by the electrical conductivity measuring device 133. The makeup water pump 141, the softened water makeup water valve 144, the raw water makeup water valve 152 and the like are controlled to supply the makeup water W120 (softened water makeup water W122 or softened water to the storage section 116 of the cooling tower 110 via the makeup water line L120. The flow after the replenishment of the raw water replenishment water W121) will be described.

  As shown in FIG. 3, in step ST101, the hardness measuring device 134 measures the calcium hardness of the circulating water W110. Information on the calcium hardness measured by the hardness measurement device 134 is input to the hardness determination unit 182 of the control unit 102 of the system control device 101.

  In step ST102, the hardness determination unit 182 determines whether the calcium hardness of the circulating water W110 is greater than or equal to a predetermined lower limit threshold value or lower than a predetermined lower limit threshold value based on the input calcium hardness information. To do. If the calcium hardness is lower than the predetermined lower threshold (YES), the process proceeds to step ST103. If the calcium hardness is greater than or equal to a predetermined lower threshold (NO), the process proceeds to step ST104.

  When the calcium hardness is lower than the predetermined lower threshold (YES), the calcium hardness of the circulating water W110 does not have a sufficient height for obtaining a corrosion inhibiting effect. Therefore, in step ST103, it is necessary to increase the calcium hardness and suppress corrosion, and the raw water replenishment water W121 (containing a large amount of hardness components) is replenished. Specifically, the makeup water control unit 183 controls the softening water makeup water valve 144 and the like so as to stop the flow of the softening water makeup water W122 when the makeup water supplement water W122 is replenished. The makeup water control unit 183 controls the raw water makeup water valve 152 and the like so as to start circulation of the raw water makeup water W121. Thereby, the raw water replenishment water W121 is supplied to the storage part 116 of the cooling tower 110, and the calcium hardness of the circulating water W110 stored in the storage part 116 increases.

  After step ST103, the calcium hardness may be lower than a predetermined lower threshold, so the process returns to step ST101, and the hardness measuring device 134 measures the calcium hardness of the circulating water W110 again.

  When the calcium hardness is equal to or greater than the predetermined lower threshold (NO), the calcium hardness of the circulating water W110 has a sufficient height for obtaining a corrosion inhibiting effect. Therefore, there is no need to increase the calcium hardness of the circulating water W110, and emphasis is placed on the suppression of scale generation, and the hardness determination unit 182 determines that the calcium hardness of the circulating water W110 is a predetermined value based on the input calcium hardness information. It is determined whether it is higher than the upper threshold or lower than the upper threshold.

  In step ST104, the hardness determination unit 182 determines whether the calcium hardness of the circulating water W110 is higher than the upper threshold or lower than the upper threshold based on the input calcium hardness information. If the calcium hardness is higher than the upper threshold (YES), the process proceeds to step ST105. When the calcium hardness is equal to or lower than the upper limit threshold (NO), the process proceeds to step ST104.

  When the calcium hardness is higher than the predetermined upper limit threshold value (YES), the calcium hardness of the circulating water W110 has a sufficient height to obtain a corrosion inhibiting effect. Therefore, in step ST105, it is not necessary to increase the calcium hardness of the circulating water W110, and the softened water makeup water W122 is replenished with emphasis on the suppression of scale generation. Specifically, the makeup water control unit 183 controls the raw water makeup water valve 152 and the like so as to stop the circulation of the raw water makeup water W121 when the raw water makeup water W121 is being replenished. Further, the makeup water control unit 183 controls the softened water makeup water valve 144 and the like so as to start circulation of the softened water makeup water W122. Thereby, the softened water replenishment water W122 is supplied to the storage part 116 of the cooling tower 110. Since the softened water replenishment water W122 contains almost no hardness component, the calcium hardness of the circulating water W110 stored in the storage unit 116 is low.

  After step ST105, there is a case where the calcium hardness is lower than a predetermined lower limit threshold value or the calcium hardness is higher than a predetermined upper limit threshold value. Therefore, the process returns to step ST101, and the hardness measuring device 134 determines the calcium hardness of the circulating water W110. Measure again.

  When the calcium hardness is equal to or lower than the upper limit threshold value (NO), the calcium hardness of the circulating water W110 is in the range from the predetermined lower limit threshold value to the predetermined upper limit threshold value in the predetermined range. It has the necessary hardness to suppress the generation of scale. Here, the calcium hardness of the circulating water W110 has a required hardness, but the circulating water W120 (softened water supplemented water W122 or raw water supplemented water W121) is supplied to the reservoir 116 of the cooling tower 110 by circulating water. There is a possibility that W110 is concentrated. Therefore, based on the electrical conductivity measured by the electrical conductivity measurement device 133, the concentration determination unit 181 determines whether or not the circulating water W110 is concentrated.

  In step ST106, the electrical conductivity measuring device 133 measures the electrical conductivity of the circulating water W110. Information on the electrical conductivity of the circulating water W110 measured by the electrical conductivity measuring device 133 is input to the concentration determination unit 181 of the control unit 102 of the system control device 101.

  In step ST107, the enrichment determination unit 181 determines whether or not the electrical conductivity of the circulating water W110 is less than a predetermined threshold based on the input electrical conductivity information. If the electrical conductivity is less than the predetermined threshold (YES), the supply of the makeup water W120 (softened water makeup water W122 and raw water makeup water W121) is stopped. If the electrical conductivity is equal to or higher than a predetermined threshold (NO), the process returns to step ST101.

  Specifically, when the electrical conductivity is less than a predetermined threshold value (YES), the circulating water W110 is not concentrated and has a hardness necessary for obtaining a corrosion-inhibiting effect. Since it has the necessary hardness to suppress, the replenishment of the makeup water W120 (softened water makeup water W122 and raw water makeup water W121) is stopped.

  On the other hand, when the electrical conductivity is equal to or higher than the predetermined threshold (NO), since the circulating water W110 is concentrated, the replenishment of the makeup water W120 (softened water makeup water W122 or raw water makeup water W121) is continued. After step ST107, in step ST101, the hardness measuring device 134 measures the calcium hardness of the circulating water W110 again.

According to the water treatment system 100 of the first embodiment, for example, the following effects are exhibited.
The water treatment system 100 of the first embodiment includes a hardness measuring device 134 that measures the hardness of the circulating water W110, and the flow rate of the raw water makeup water W121 and / or the hardness of the circulating water W110 measured by the hardness measuring device 134. Alternatively, a makeup water controller 183 that controls the flow rate of the softened water makeup water W122 is provided.

  Therefore, for example, as in the first embodiment described above, at the time of normal replenishment, the softened water replenishment water W122 is replenished to the storage unit 116, while the raw water replenishment water W121 is supplied to the storage unit 116 to such an extent that a corrosion suppression effect can be secured. Can be replenished. Therefore, with respect to the circulating water W110, generation of slime, scale and the like, and corrosion of the piping system and the like can be more reliably performed.

  Next, another embodiment of the present invention will be described. The other embodiments will be described mainly with respect to differences from the first embodiment, and the same configurations as those in the first embodiment have the same reference (however, the hundreds of three-digit numbers are indicated by “ 1 ”to“ 2 ”), and detailed description is omitted. For the points not specifically described in other embodiments, the description of the first embodiment is appropriately applied or incorporated.

Second Embodiment
With reference to FIG. 4, the outline of the water treatment system 200 of 2nd Embodiment of this invention is demonstrated. FIG. 4 is a schematic configuration diagram showing a water treatment system 200 according to the second embodiment of the present invention.

  The water treatment system 200 according to the second embodiment is mainly different from the water treatment system 100 according to the first embodiment in that the cooling tower 210 is a sealed cooling tower. The closed-type cooling tower is positioned in the cooling tower 210 as compared with the open-type cooling tower, in the cooling tower 210, the cooling tower internal line L250 in which the circulating liquid W210 for cooling the apparatus 231 to be cooled circulates. In order to cool the circulating fluid W210 to be cooled, a water spraying part 212 for spraying the sprayed water W240 to the outside of the cooling tower internal line L250, a storage part 216 for storing the sprayed sprayed water W240, and The main difference is that a spray water line L260 for circulating the spray water W240 sprayed from the sprinkler 212 and stored in the reservoir 216 is connected to the cooling tower 210.

  As shown in FIG. 4, the water treatment system 200 of the second embodiment has a cooling tower 210 and is a system that circulates a coolant to cool the apparatus to be cooled 231. From the viewpoint of saving the cooling liquid, the cooling liquid is circulated and used while being cooled in the cooling tower 210 (hereinafter, the circulating cooling liquid is also referred to as “circulating liquid W210”). The cooling tower 210 in the second embodiment is a so-called hermetic cooling tower.

  The water treatment system 200 of the second embodiment is a circulation that circulates the circulating liquid W210 between the cooling tower 210 having the storage part 216 of the sprinkled water W240, the cooling target device 231, and the cooling tower 210 and the cooling target device 231. The liquid line L210, the sprinkling water line L260 for circulating the sprinkling water W240, the replenishing water line L220 for replenishing the replenishing water W220 to the storage part 216 of the cooling tower 210, and the sprinkling water W240 from the storage part 216 of the cooling tower 210 are watered. A drainage line L230 forcibly discharging out of the processing system 200, an overflow line L240 for discharging the sprayed water W240 overflowing from the storage unit 216 of the cooling tower 210, and an electrical conductivity for measuring the electrical conductivity of the sprayed water W240. A measuring device 233, a hardness measuring device 234 for measuring the hardness of the spray water W240, and the water treatment system 200. A system controller 201 for controlling the parts, as a major component, a.

  The cooling tower 210 sprays spray water W240 to the outside of the cooling tower internal line L250 in order to cool the cooling tower internal line L250 in which the circulating liquid W210 flows in a sealed state and the circulating liquid W210 located in the cooling tower internal line L250. And the storage part 216 for storing the dispersed sprayed water W240.

  The circulating liquid line L210 includes a circulating liquid supply line L211 for supplying the circulating liquid W210 located in the cooling tower internal line L250 from the cooling tower 210 to the cooled apparatus 231 and a cooling of the circulating liquid W210 from the cooled apparatus 231 to the cooling tower 210. And a circulating fluid recovery line L212 for recovery to the tower internal line L250. The circulating fluid line L210 circulates the circulating fluid W210 between the cooling tower 210 and the apparatus to be cooled 231 via the circulating fluid supply line L211, the circulating fluid recovery line L212, and the cooling tower internal line L250.

The spray water line L260 is connected to the storage unit 216 and to the water spray unit 212. The spray water line L260 circulates the spray water W240 sprayed from the sprinkler 212 and stored in the reservoir 216 outside the cooling tower 110.
“Line” is a general term for lines that allow the flow of objects such as flow paths, paths, and pipelines.

The cooling tower 210 in 2nd Embodiment is demonstrated. The cooling tower 210 cools the circulating liquid W <b> 210 for cooling the apparatus to be cooled 231 before supplying it to the apparatus to be cooled 231. The circulating liquid W210 is generally water (aqueous solution), but may be a liquid other than water.
The cooling tower 210 includes a tower main body 211, a cooling tower internal line L250, a water sprinkling part 212, a storage part 216, a louver 218, a fan 220, an upper opening part 221, and a fan driving part 222.

  The tower main body 211 forms an outline of the cooling tower 210. A plurality of sprinklers 212, a fan 220, an upper opening 221, and a fan driving unit 222 are provided on the top of the tower body 211. Inside the tower main body 211, a cooling tower internal line L250 is provided. A storage unit 216 is provided in the lower portion of the tower main body 211. A louver 218 is provided on the side of the tower body 211.

  The water sprinkling unit 212 is a part that sprays the sprayed water W240 to the outside of the cooling tower internal line L250 where the circulating liquid W210 is located (circulates) in order to cool the circulating liquid W210 that cools the cooling target device 231. The water sprinkling unit 212 sprays (sprinkles) the spray water W240 circulating through the spray water line L260 to the outside of the cooling tower internal line L250 inside the tower main body 211.

  The water sprinkling unit 212 includes an upper water tank 213 and a water spout 214. A spray water line L260 is connected to the upper water tank 213. The upper water tank 213 stores the spray water W240 that circulates through the spray water line L260. The water spout 214 is composed of a nozzle formed on the lower side of the upper water tank 213 in order to spray the spray water W240 stored in the upper water tank 213.

The cooling tower internal line L250 is a line through which the circulating liquid W210 flows in a sealed state inside the tower main body 211. The cooling tower internal line L250 meanders in order to ensure a contact area with the spray water W240 inside the tower main body 211. Specifically, the cooling tower internal line L250 branches into a first internal line L250a and a second internal line L250b at the tower internal branch portion J251. The first internal line L250a and the second internal line L250b join at the tower internal junction J252. The first internal line L250a and the second internal line L250b meander. The first internal line L250a and the second internal line L250b are respectively disposed below the sprinkler 212.
The downstream end of the cooling tower internal line L250 is connected to the circulating liquid supply line L211. The upstream end of the cooling tower internal line L250 is connected to the circulating liquid recovery line L212.

  A filler (not shown) is provided below the sprinkler 212 in the tower main body 211. The filling material drops the sprayed water W240 sprayed from the sprinkler 212 to increase the contact area and contact time between the sprayed water W240 and the outside air E1 (described later), so that the cooling tower internal line L250 and the inside thereof are increased. It is provided to efficiently cool the circulating fluid W210.

  Storage unit 216 stores sprayed water W240 sprayed from sprinkling unit 212. The storage unit 216 is provided in the lower part of the tower main body 211. As will be described later, the spray water W240 stored in the storage unit 216 is cooled in the process of falling inside the tower body 211. A spray water line L260 and a drainage line L230 are connected to the bottom of the reservoir 216. The spray water W240 stored in the storage unit 216 circulates outside the tower body 211 via the spray water line L260. The spray water W240 stored in the storage unit 216 is discharged out of the water treatment system 200 through the drain line L230.

  The louver 218 is a ventilation hole for introducing outside air (air) E1 into the inside of the tower main body 211, and communicates the outside and the inside of the tower main body 211. Air (outside air) E1 outside the tower main body 211 can flow into the tower main body 211 through the louver 218.

  The upper opening 221 is an opening formed in the upper part of the tower main body 211 and is provided for discharging the air E <b> 1 located inside the tower main body 211 to the outside of the tower main body 211. The discharged air is also referred to as “exhaust E2.”

  The fan 220 is disposed in the upper opening 221. The rotation shaft 220a of the fan 220 is disposed so as to extend in the vertical direction. The fan 220 allows outside air (air) E1 to flow into the inside of the tower body 211 from the louver 218 and exhausts the air E1 located inside the tower body 211 to the outside of the tower body 211 via the upper opening 221. To generate airflow.

  The fan driving unit 222 is composed of a motor or the like and rotationally drives the fan 220. The fan driving unit 222 is disposed above the fan 220 and is connected to the rotation shaft 220 a of the fan 220. The fan driving unit 222 starts or stops the rotational driving of the fan 220, adjusts the rotational speed (shift), and the like.

  In addition to the circulating liquid line L210, the spray water line L260, and the drainage line L230, the cooling tower 210 is connected with a makeup water line L220 (raw water makeup water line L222, softened water makeup water line L223) and overflow line L240. . Sprinkling water W240 is introduced into or discharged from cooling tower 210 via these lines, and makeup water W220 (raw water makeup water W221 and softened water makeup water W222) is replenished.

  The apparatus to be cooled 231 has a required circulating fluid flow path (not shown). This circulating fluid flow path has a circulating fluid inlet 231a and a circulating fluid outlet 231b. The downstream end of the circulating fluid supply line L211 is connected to the circulating fluid introduction portion 231a. The upstream end of the circulating fluid recovery line L212 is connected to the circulating fluid discharge portion 231b. As described above, the circulating liquid flow path circulates the circulating liquid W210 between the tower body 211 of the cooling tower 210 and the cooled device 231 together with the circulating liquid supply line L211, the circulating liquid recovery line L212, and the cooling tower internal line L250. A circulation path is formed for this purpose.

The circulating liquid supply line L211 connects the cooling tower internal line L250 of the cooling tower 210 and the apparatus to be cooled 231. The circulating fluid supply line L211 can supply the circulating fluid W210 located in the cooling tower internal line L250 to the apparatus 231 to be cooled.
A circulating fluid pump 232 is connected in the middle of the circulating fluid supply line L211. The circulating fluid pump 232 can send out the circulating fluid W210 from the upstream side to the downstream side of the circulating fluid line L210 (the circulating fluid supply line L211 and the circulating fluid recovery line L212).

  The circulating fluid recovery line L212 connects the apparatus to be cooled 231 and the cooling tower internal line L250 of the cooling tower 210. The circulating fluid recovery line L212 can recover the circulating fluid W210 heated by heat exchange in the apparatus to be cooled 231 to the cooling tower internal line L250 of the cooling tower 210.

  The sprinkling water line L260 includes a sprinkling water supply line L261 that supplies the sprinkling water W240 stored in the storage unit 216 from the cooling tower 210 to the sprinkling water pump 239, and a sprinkling water W240 from the sprinkling water pump 239 to the sprinkling part of the cooling tower 210. And a spray water recovery line L262 for recovery to 212. The spray water line L260 circulates the spray water W240 outside the cooling tower 210 via the spray water supply line L261 and the spray water recovery line L262.

  The downstream side of the spray water recovery line L262 is branched into a plurality of lines at the spray water branch portion J241. In the spray water line L260, a line upstream from the spray water branch part J241 is also referred to as an “upstream spray water recovery line L262a”, and a plurality of lines downstream from the spray water branch part J241 are referred to as “downstream spray water recovery”. Also referred to as “line L262b”. The downstream ends of the plurality of downstream sprayed water collection lines L262b are connected to the plurality of sprinklers 212, respectively.

  The spray water pump 239 is connected in the middle of the spray water line L260 (between the spray water supply line L261 and the spray water recovery line L262). The spray water pump 239 can send the spray water W240 from the upstream side to the downstream side of the spray water line L260 (spread water supply line L261, spray water recovery line L262).

  The electrical conductivity measuring device 233 is a device that measures the electrical conductivity of the spray water W240. The electrical conductivity measuring device 233 is connected to the spray water line L260. In detail, the measurement connection part J242 is provided in the spray water supply line L261. The electrical conductivity measuring device 233 is connected to the spray water supply line L261 at the measurement connection portion J242 via the measurement line L263.

  When the concentration of the spray water W240 increases, the concentrations of corrosive ions and scale generation factors increase. Thereby, the electrical conductivity of spray water W240 becomes high. Therefore, in the water treatment system 200, when the electrical conductivity measured by the electrical conductivity measuring device 233 is higher than a predetermined threshold, the concentration of the spray water W240 is decreased (the electrical conductivity is reduced). In order to reduce the supply water W220, the supply water W220 is supplied to the storage unit 216 of the cooling tower 210, and the spray water W240 stored in the storage unit 116 is diluted. In this way, the concentration of the spray water W240 is managed based on the electrical conductivity of the spray water W240.

  The hardness measuring device 234 is a device that measures the hardness of the spray water W240. The hardness measuring device 234 is connected to the spray water line L260. Specifically, the hardness measuring device 234 is connected to the spray water supply line L261 at the measurement connection portion J242 via the measurement line L263.

  The structure regarding the makeup water line L220 in 2nd Embodiment is the same as the structure (refer FIG. 1) regarding the makeup water line L120 in 1st Embodiment. Therefore, the description about the structure regarding the makeup water line L120 in 1st Embodiment is used, and description about the structure regarding the makeup water line L220 in 2nd Embodiment is abbreviate | omitted.

  The drain line L230 is connected to the bottom part of the storage part 216 and extends downward. The drain line L230 discharges the spray water W240 stored in the storage unit 216 to the outside of the water treatment system 200 as the drainage W230. A drain valve 261 is connected in the middle of the drain line L230. An overflow line L240 (described later) is connected to the downstream side of the drainage valve 261 in the drainage line L230 via a drainage junction J231. The drain valve 261 is composed of a control valve. The drainage valve 261 can open and close the drainage line L230 between the storage unit 216 and the drainage junction J231.

  The overflow line L240 is a line for discharging the sprayed water W240 overflowing from the storage unit 216 to the outside of the water treatment system 200 as the drainage W230. The upstream end portion 262 of the overflow line L240 is located at a position spaced upward from the storage portion 216 of the cooling tower 210. The overflow line L240 is connected (joined) with the drainage line L230 at the drainage junction J231.

The spray water W240 overflowing from the reservoir 216 flows into the overflow line L240 from the upstream end 262 of the overflow line L240. The spray water W240 that has flowed into the overflow line L240 flows into the drainage line L230 via the drainage junction J231 and is discharged out of the water treatment system 200.
In this embodiment, the drainage valve 261 constitutes “drainage distribution means for distributing the sprayed water W240 stored in the storage unit 216 via the drainage line L230 toward the outside of the system”.

Next, with reference to FIG. 5, the function which concerns on control of the water treatment system 200 of 2nd Embodiment is demonstrated. FIG. 5 is a functional block diagram relating to control of the water treatment system 200 of the second embodiment.
The system control apparatus 201 controls each unit in the water treatment system 200 of the second embodiment. As shown in FIG. 5, the system control apparatus 201 is electrically connected to, for example, a makeup water pump 241, a softened water makeup water valve 244, a raw water makeup water valve 252, a drain valve 261, and a fan drive unit 222.

  Moreover, the system control apparatus 201 is electrically connected to each measurement apparatus in the water treatment system 200, and receives measurement information from each measurement apparatus. For example, the system control device 201 is electrically connected to the electrical conductivity measurement device 233 and receives electrical conductivity information measured by the electrical conductivity measurement device 233. The system control device 201 is electrically connected to the hardness measurement device 234 and receives hardness information measured by the hardness measurement device 234.

  The system control device 201 includes a control unit 202. The control unit 202 includes a concentration determination unit 281, a hardness determination unit 282, and a makeup water control unit 283 as a flow rate control unit.

  The configuration and operation of the system control apparatus 201 in the second embodiment are the same as the configuration and operation of the system control apparatus 101 in the first embodiment. However, in the first embodiment, the replenishment (circulation) of the makeup water W120 is controlled based on the electrical conductivity and hardness of the circulating water W110, whereas in the second embodiment, the electrical conductivity of the spray water W240 is controlled. The difference between the two embodiments is that the replenishment (distribution) control of the replenishing water W220 is performed based on the hardness. In consideration of this point, the description of the configuration and operation of the system control apparatus 101 in the first embodiment is cited, and the description of the configuration and operation of the system control apparatus 201 in the second embodiment is omitted.

  Next, with reference to FIG.4 and FIG.5, operation | movement of the water treatment system 200 of 2nd Embodiment is demonstrated.

Specifically, when the circulating fluid pump 232 is operated, the circulating fluid W210 located in the cooling tower internal line L250 of the cooling tower 210 is upstream of the circulating fluid line L210 (the circulating fluid supply line L211 and the circulating fluid recovery line L212). Sent from the side toward the downstream side.
Specifically, the circulating fluid W210 is supplied to the cooled apparatus 231 via the circulating fluid supply line L211. The circulating fluid W210 passes through the circulating fluid flow path from the circulating fluid introduction portion 231a of the cooled device 231 to cool the cooled device 231 and is discharged from the circulating fluid discharge portion 231b to the circulating fluid recovery line L212. The circulating fluid W210 discharged to the circulating fluid recovery line L212 is introduced into the cooling tower internal line L250 of the cooling tower 110. In this way, the circulating liquid W210 circulates through the circulating liquid line L210, the cooling tower internal line L250, and the like.

  In addition, by operating the spray water pump 239, the spray water W240 stored in the storage unit 216 of the cooling tower 210 is downstream from the upstream side of the spray water line L260 (spray water supply line L261, spray water recovery line L262). Sent to the side.

  The spray water W240 sent to the spray water line L260 is introduced into the upper water tank 213 of the sprinkler 212. The spray water W240 introduced into the upper water tank 213 is sprayed from the water spout 214 to the outside of the cooling tower internal line L250 inside the tower main body 211. As shown by the dotted line in FIG. 4, the sprayed spray water W240 falls inside the tower body 211 and is received by the storage unit 216. Thus, the spray water W240 stored in the storage unit 216 circulates through the spray water line L260, the water spray unit 212, and the like.

  In the cooling tower 210, the system controller 201 operates the fan drive unit 222 to rotate the fan 220. Accordingly, outside air (air) E1 flows into the tower main body 211 through the louver 218. The air E1 passes through the inside of the tower main body 211, and is discharged from the upper opening 221 to the outside of the tower main body 211 as exhaust E2.

  The spray water W240 falling inside the tower main body 211 is cooled by touching the outside air E1 flowing into the tower main body 211. The sprayed water W240 that is cooled in this way and returns (falls) to the storage unit 216 returns to the spraying unit 212 of the cooling tower 210 again through the sprayed water line L260. Therefore, the spray water W240 stored in the storage unit 216 functions as cooling water that circulates through the spray water line L260 and cools the cooling tower internal line L250 and the circulating fluid W210 therein.

  The configuration and operation related to the replenishment (distribution) control of the makeup water W220 (raw water makeup water W221, softened water makeup water W222) in the second embodiment are the same as the makeup water W120 (raw water makeup water W121, softened water) in the first embodiment. This is the same as the configuration (see FIG. 2) and operation (control flow, see FIG. 3) related to the replenishment (circulation) control of the makeup water W122). However, in the first embodiment, the replenishment (circulation) of the makeup water W120 is controlled based on the electrical conductivity and hardness of the circulating water W110, whereas in the second embodiment, the electrical conductivity of the spray water W240 is controlled. The difference between the two embodiments is that the supply (distribution) of the makeup water W220 is controlled based on the hardness. In consideration of this point, the description of the configuration and operation related to the control of supply (distribution) of makeup water W120 in the first embodiment is used, and the control of supply (distribution) of makeup water W220 in the second embodiment. Description of the configuration and operation according to the above will be omitted.

Next, a second example of the operation of the water treatment system 200 of the second embodiment will be described with reference to FIG. FIG. 6 is a flowchart showing the operation of the water treatment system 200 of the second embodiment.
In the second embodiment, when the concentration determination unit 281 determines that the spray water W240 is concentrated based on the electric conductivity measured by the electric conductivity measuring device 233, the makeup water control unit 283 The makeup water pump 241, the softened water makeup water valve 244, the raw water makeup water valve 252, etc. are controlled, and the makeup water W 220 (softened water makeup water W 222 or A flow after the replenishment of the raw water replenishment water W221) will be described.

  As shown in FIG. 6, in step ST201, the hardness measuring device 234 measures the calcium hardness of the spray water W240. Information on the calcium hardness measured by the hardness measurement device 234 is input to the hardness determination unit 282 of the control unit 202 of the system control device 201.

  In step ST202, the hardness determination unit 282 determines whether the calcium hardness of the spray water W240 is higher than a predetermined threshold or lower than a predetermined threshold based on the input calcium hardness information. If the calcium hardness is lower than the predetermined lower threshold (YES), the process proceeds to step ST203. If the calcium hardness is greater than or equal to a predetermined lower threshold (NO), the process proceeds to step ST204.

  When the calcium hardness is lower than the predetermined lower threshold (YES), the calcium hardness of the spray water W240 does not have a sufficient height for obtaining a corrosion inhibiting effect. Therefore, in step ST203, it is necessary to increase the calcium hardness and suppress corrosion, and the raw water replenishment water W221 is replenished (containing a large amount of hardness components). Specifically, the makeup water control unit 283 controls the softening water makeup water valve 244 and the like so as to stop the flow of the softening water makeup water W222 when the lubrication water makeup water W222 is being replenished. Further, the makeup water control unit 283 controls the raw water makeup water valve 252 and the like so as to start circulation of the raw water makeup water W221. Thereby, raw | natural water replenishment water W221 is supplied to the storage part 216 of the cooling tower 210, and the calcium hardness of the spray water W240 stored in the storage part 216 increases.

  After step ST203, since the calcium hardness may be lower than a predetermined lower threshold, the process returns to step ST201, and the hardness measuring device 234 measures the calcium hardness of the spray water W240 again.

  When the calcium hardness is equal to or higher than a predetermined lower threshold (NO), the calcium hardness of the spray water W240 has a sufficient height for obtaining a corrosion inhibiting effect. Therefore, it is not necessary to increase the calcium hardness of the sprinkling water W240, and emphasizing the suppression of scale generation, the hardness determination unit 282 determines that the calcium hardness of the sprinkling water W240 is a predetermined value based on the input calcium hardness information. It is determined whether it is higher than the upper threshold or lower than the upper threshold.

  In step ST204, the hardness determination unit 282 determines whether the calcium hardness of the spray water W240 is higher than the upper threshold or lower than the upper threshold based on the input calcium hardness information. If the calcium hardness is higher than the upper threshold (YES), the process proceeds to step ST205. When the calcium hardness is equal to or lower than the upper limit threshold (NO), the process proceeds to step ST204.

  When the calcium hardness is higher than a predetermined upper limit threshold (YES), the calcium hardness of the spray water W240 has a sufficient height to obtain a corrosion inhibiting effect. Therefore, in step ST205, it is not necessary to increase the calcium hardness of the spray water W240, and the softened water replenishment water W222 is replenished with emphasis on suppression of scale generation. Specifically, the makeup water control unit 283 controls the raw water makeup water valve 252 and the like so as to stop the circulation of the raw water makeup water W221 when the raw water makeup water W221 is being replenished. In addition, the makeup water control unit 283 controls the softened water makeup water valve 244 and the like so as to start the distribution of the softened water makeup water W222. Thereby, the softened water replenishment water W222 is supplied to the storage unit 216 of the cooling tower 210. Since the softened water replenishment water W222 contains almost no hardness component, the calcium hardness of the spray water W240 stored in the storage unit 216 is low.

  After step ST205, the calcium hardness may be lower than a predetermined lower threshold or the calcium hardness may be higher than a predetermined upper threshold. Therefore, the process returns to step ST201, and the hardness measuring device 234 determines the calcium hardness of the spray water W240. Measure again.

  When the calcium hardness is equal to or lower than the upper limit threshold (NO), the calcium hardness of the spray water W240 is within the range from the predetermined lower limit threshold to the predetermined upper limit threshold in the predetermined range. It has the necessary hardness to suppress the generation of scale. Here, although the calcium hardness of the sprinkling water W240 has a required hardness, the sprinkling water is obtained by replenishing the replenishing water W220 (softened water replenishing water W222 or raw water replenishing water W221) to the storage unit 216 of the cooling tower 210. There is a possibility that W240 is concentrated. Therefore, based on the electrical conductivity measured by the electrical conductivity measuring device 233, the concentration determination unit 281 determines whether or not the spray water W240 is concentrated.

  In step ST206, the electrical conductivity measuring device 233 measures the electrical conductivity of the spray water W240. Information on the electrical conductivity of the spray water W240 measured by the electrical conductivity measurement device 233 is input to the concentration determination unit 281 of the control unit 202 of the system control device 201.

  In step ST207, the enrichment determination unit 281 determines whether or not the electrical conductivity of the spray water W240 is less than a predetermined threshold based on the input electrical conductivity information. When the electrical conductivity is less than a predetermined threshold (YES), the supply of the makeup water W220 (softened water makeup water W222 and raw water makeup water W221) is stopped. If the electrical conductivity is equal to or higher than a predetermined threshold (NO), the process returns to step ST201.

  Specifically, when the electrical conductivity is less than a predetermined threshold (YES), the spray water W240 is not concentrated and has a hardness necessary for obtaining a corrosion-inhibiting effect. Since it has the necessary hardness to be suppressed, the replenishment of the makeup water W220 (softened water makeup water W222 and raw water makeup water W221) is stopped.

  On the other hand, when the electrical conductivity is equal to or higher than the predetermined threshold (NO), the spray water W240 is concentrated, and thus the replenishment of the makeup water W220 (softened water makeup water W222 or raw water makeup water W221) is continued. After step ST207, in step ST201, the hardness measuring device 234 measures the calcium hardness of the spray water W240 again.

According to the water treatment system 200 of the second embodiment, for example, the following effects are exhibited.
The water treatment system 200 according to the second embodiment includes a hardness measurement device 234 that measures the hardness of the spray water W240, and the flow rate of the raw water makeup water W221 and / or based on the hardness of the spray water W240 measured by the hardness measurement device 234. Alternatively, a makeup water control unit 283 that controls the flow rate of the softened water makeup water W222 is provided.

  Therefore, for example, as in the second embodiment described above, at the time of normal replenishment, the softened water replenishment water W222 is replenished to the storage unit 216, while the raw water replenishment water W221 is supplied to the reserving unit 216 to the extent that a corrosion suppression effect can be secured. Can be replenished. Accordingly, the sprinkled water W240 can be more reliably suppressed from generation of slime, scale and the like, and corrosion of the piping system and the like.

The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and can be implemented in various forms.
For example, in the first embodiment including an open cooling tower, the hardness measuring device 134 is connected to the circulating water line L110 and measures the hardness of the circulating water W110 flowing through the circulating water line L110. Not limited. For example, the hardness measuring device 134 may be connected to the storage unit 116 of the cooling tower 110 and measure the hardness of the circulating water W110 stored in the storage unit 116. Further, the hardness measuring device 134 may be connected to the sprinkler 112 of the cooling tower 110 and measure the hardness of the circulating water W110 located in the sprinkler 112.

  Further, in the second embodiment including the hermetic cooling tower, the hardness measuring device 234 is connected to the spray water line L260 and measures the hardness of the spray water W240 flowing through the spray water line L260. Not limited. For example, the hardness measuring device 234 may be connected to the storage unit 216 of the cooling tower 210 and measure the hardness of the spray water W240 stored in the storage unit 216. Further, the hardness measuring device 234 may be connected to the sprinkler 212 of the cooling tower 210 and measure the hardness of the sprinkled water W240 located in the sprinkler 212.

  In the first embodiment, the raw water replenishment water W121 and the softened water replenishment water W122 are independently replenished to the storage unit 116 of the cooling tower 110, but are not limited thereto. For example, the raw water replenishment water W121 and the softened water replenishment water W122 may be replenished to the storage unit 116 of the cooling tower 110 in a state of being merged outside the cooling tower 110. The same applies to the second embodiment.

  In the first embodiment including an open cooling tower, the raw water makeup water line L122 supplies the raw water makeup water W121 to the storage section 116, and the softened water makeup water line L123 supplies the soft water supplementary water W122 to the storage section 116. It is replenished, but is not limited to this. For example, the raw water replenishment water line L122 may replenish the raw water replenishment water W121 to any one or more of the sprinkler 112, the reservoir 116, and the circulating water line L110. Further, the softened water replenishment water line L123 may replenish the softened water replenishment water W122 to any one or more of the sprinkler 112, the reservoir 116, and the circulating water line L110.

  With reference to FIGS. 7-12, the modification regarding the replenishment position of the raw | natural water replenishment water W121 and softened water replenishment water W122 in 1st Embodiment is demonstrated concretely. FIG. 7 is a diagram illustrating a first modification example regarding the replenishment positions of the raw water replenishment water W121 and the softened water replenishment water W122 in the first embodiment. FIG. 8 is a diagram illustrating a second modification example regarding the replenishment positions of the raw water replenishment water W121 and the softened water replenishment water W122 in the first embodiment. FIG. 9 is a diagram illustrating a third modification example regarding the replenishment positions of the raw water replenishment water W121 and the softened water replenishment water W122 in the first embodiment.

  FIG. 10 is a diagram illustrating a fourth modification example regarding the replenishment positions of the raw water replenishment water W121 and the softened water replenishment water W122 in the first embodiment. FIG. 11 is a diagram illustrating a fifth modification example regarding the replenishment positions of the raw water replenishment water W121 and the softened water replenishment water W122 in the first embodiment. FIG. 12 is a diagram illustrating a sixth modification example regarding the replenishment positions of the raw water replenishment water W121 and the softened water replenishment water W122 in the first embodiment. 7 to 12, the system control apparatus 101 and the control lines related to the system control apparatus 101 are omitted.

  As in the first modification shown in FIG. 7, the raw water makeup water line L122 supplies the raw water makeup water W121 to the storage unit 116, and the softened water makeup water line L123 supplies the softened water makeup water W122 to the watering unit 112. May be. Further, as in the second modification shown in FIG. 8, the raw water makeup water line L122 supplies the raw water makeup water W121 to the sprinkler 112, and the softened water makeup water line L123 stores the softened water makeup water W122. May be replenished.

  Further, as in the third modification shown in FIG. 9, the raw water makeup water line L122 supplies the raw water makeup water W121 to the sprinkler 112, and the softened water makeup water line L123 supplies the softened water makeup water W122 to the water spray 112. May be replenished. 10, the raw water makeup water line L122 supplies the raw water makeup water W121 to the circulating water line L110, and the softened water makeup water line L123 supplies the circulating water to the softened water makeup water W122. You may supply to the line L110.

  11, the raw water makeup water line L122 replenishes the raw water makeup water W121 to the circulating water line L110, and the softened water makeup water line L123 stores the softened water makeup water W122. 116 may be replenished. 12, the raw water makeup water line L122 replenishes the raw water makeup water W121 to the storage unit 116, and the softened water makeup water line L123 supplies the softened water makeup water W122 to the circulating water line. You may supply to L110.

  In the second embodiment including the hermetic cooling tower, the raw water replenishment water line L222 replenishes the raw water replenishment water W221 to the storage unit 216, and the softened water replenishment water line L223 stores the softened water replenishment water W222. Although it supplies to 216, it is not restrict | limited to this. For example, the raw water replenishment water line L222 may replenish the raw water replenishment water W221 to any one or more of the sprinkler 212, the reservoir 216, and the spray water L260. Moreover, the softened water replenishment water line L223 may replenish the softened water replenishment water W222 to any one or more of the sprinkler 212, the reservoir 216, and the spray water L260.

  Specifically, the raw water makeup water line L222 in the second embodiment is the same as the first modification to the sixth modification (see FIGS. 7 to 12) regarding the replenishment position of the raw water makeup water W121 in the first embodiment. Similarly, the raw water replenishment water W221 may be replenished to other than the storage unit 216. Further, the softened water makeup water line L223 in the second embodiment is the same as the first to sixth modifications (see FIGS. 7 to 12) related to the replenishment position of the softened water makeup water W122 in the first embodiment. Alternatively, the softened water replenishment water W222 may be replenished to other than the storage unit 216.

  In the first embodiment, when the hardness of the circulating water W110 is high, the circulation of the raw water makeup water W121 is stopped and the circulation of the softened water makeup water W122 is started, but this is not restrictive. For example, the distribution of the softened water makeup water W122 may be started while the circulation of the raw water makeup water W121 is continued. In this case, it is preferable to replenish the storage unit 116 of the cooling tower 110 with the softened water replenishment water W122 as a main body and a small amount of raw water replenishment water W121.

  Moreover, in the said 1st Example, when the hardness of the circulating water W110 is low, the distribution | circulation of the softened water supplementary water W122 is stopped, and the distribution | circulation of the raw | natural water supplementary water W121 is started, However, It is not restrict | limited. For example, the circulation of the raw water makeup water W121 may be started while the circulation of the softened water makeup water W122 is continued. In this case, it is preferable to replenish the storage unit 116 of the cooling tower 110 together with a small amount of softened water supplemented water W122 mainly composed of the raw water supplemented water W121.

  In the first embodiment, when the replenishment water W120 is supplied to the storage unit 116 of the cooling tower 110, the circulating water W110 stored in the storage unit 116 is forced to the outside of the cooling tower 110 via the drainage line L130. However, it is not limited to this. For example, the circulating water W110 may be discharged only through the overflow line L140 without forcibly discharging the circulating water W110 through the drain line L130.

In the first embodiment, the flow rate of the raw water replenishment water W121 and / or the flow rate of the softened water replenishment water W122 is controlled based on the calcium hardness, but is not limited thereto. For example, the flow rate of the raw water makeup water W121 and / or the flow rate of the softened water makeup water W122 may be controlled based on the total hardness.
The description regarding the modification of the first embodiment is also applied or incorporated as appropriate in the second embodiment.

100, 200 Water treatment systems 110, 210 Cooling towers 112, 212 Sprinkling units 116, 216 Reserving units 131, 231 Cooled devices 134, 234 Hardness measuring devices 141, 241 Make-up water pump (raw water make-up water distribution means, softened water make-up water Distribution means)
144,244 Softened water replenishment water valve (softening water replenishment water distribution means)
152,252 Raw water supply water valve (raw water supply water distribution means)
183,283 Makeup water control unit (flow rate control means)
L110 Circulating water line L111 Circulating water supply line L112 Circulating water recovery line L122, L222 Raw water makeup water line L123, L223 Softened water makeup water line L210 Circulating fluid line L211 Circulating fluid supply line L212 Circulating fluid recovery line L250 Cooling tower internal line L260 Spraying Water line W110 Circulating water W121 Raw water makeup water W122 Softened water makeup water W210 Circulating fluid W240 Spray water

Claims (4)

A cooling tower having a sprinkling part for spraying the circulating water to cool the circulating water for cooling the apparatus to be cooled, and a storage part for storing the cooled circulating water;
A circulating water supply line for supplying the circulating water stored in the storage unit from the cooling tower to the cooled device, and a circulating water recovery line for recovering the circulating water from the cooled device to the watering unit of the cooling tower; A circulating water line for circulating circulating water between the cooling tower and the cooled device via the circulating water supply line and the circulating water recovery line,
An electrical conductivity measuring device for measuring the electrical conductivity of the circulating water;
Raw water makeup water line for replenishing raw water makeup water to any one or more of the sprinkling section, the storage section and the circulating water line;
Raw water makeup water distribution means for distributing raw water makeup water to any one or more of the sprinkling section, the storage section and the circulating water line via the raw water makeup water line;
Softened water replenishment water line for replenishing softened water replenishment water to any one or more of the sprinkling section, the storage section and the circulating water line;
Softened water replenishment water distribution means for distributing softened water replenishment water to any one or more of the sprinkling part, the storage part and the circulating water line via the softened water replenishment water line;
A hardness measuring device for measuring the hardness of circulating water;
When the electrical conductivity measured by the electrical conductivity measuring device is greater than or equal to a preset threshold value, the raw water makeup water circulation by the raw water makeup water circulation means or the softened water makeup water by the softened water makeup water circulation means When the electrical conductivity measured by the electrical conductivity measuring device is less than a preset threshold value, the raw water makeup water circulation by the raw water makeup water circulation means or the softened water makeup water circulation is performed. A concentration determination unit for stopping the circulation of the softened water replenishment water by means,
Based on the hardness of the circulating water measured by the hardness measuring device, the flow rate control for controlling the flow rate of the raw water makeup water by the raw water makeup water circulation means and / or the flow rate of the softened water makeup water by the softened water makeup water circulation means Means,
Equipped with a,
The hardness measuring device measures calcium hardness as hardness,
The flow rate control means is configured to stop the flow of the softened water makeup water when the calcium hardness of the circulating water measured by the hardness measuring device is lower than a predetermined lower limit threshold. the water treatment system that controls the raw makeup water distribution means as well as controlling and starts the flow of the raw water supply water. The flow rate control means controls the raw water makeup water circulation means to stop the circulation of the raw water makeup water when the calcium hardness of the circulating water measured by the hardness measuring device becomes higher than a predetermined upper limit threshold. while, the water treatment system of claim 1 for controlling the softened water makeup water flowing means so as to start the flow of softened water make-up water. A cooling tower internal line through which the circulating liquid for cooling the apparatus to be cooled circulates in a sealed state, and a sprinkling section for spraying spray water to the outside of the cooling tower internal line to cool the circulating liquid located in the cooling tower internal line And a cooling tower having a reservoir for storing the dispersed sprayed water,
A circulating liquid supply line for supplying the circulating liquid located in the cooling tower internal line from the cooling tower to the cooled apparatus, and a circulating liquid for recovering the circulating liquid from the cooled apparatus to the cooling tower internal line of the cooling tower A circulating liquid line that circulates the circulating liquid between the cooling tower and the apparatus to be cooled via the circulating liquid supply line, the circulating liquid recovery line, and the cooling tower internal line,
A sprinkling water line that is connected to the water storage unit and connected to the water sprinkling unit, circulates the water sprayed from the water sprinkling unit and stored in the water storage unit, and
An electrical conductivity measuring device for measuring the electrical conductivity of the spray water;
A raw water makeup water line for replenishing raw water makeup water to any one or more of the water sprinkling section, the storage section and the spray water line;
Raw water makeup water distribution means for distributing raw water makeup water to any one or more of the sprinkling section, the storage section, and the spray water line through the raw water makeup water line;
Softened water replenishment water line for replenishing softened water replenishment water to any one or more of the sprinkling part, the storage part and the spray water line;
Softened water replenishment water distribution means for distributing softened water replenishment water to any one or more of the sprinkling part, the storage part, and the spray water line through the softened water replenishment water line;
A hardness measuring device for measuring the hardness of spray water,
When the electrical conductivity measured by the electrical conductivity measuring device is greater than or equal to a preset threshold value, the raw water makeup water circulation by the raw water makeup water circulation means or the softened water makeup water by the softened water makeup water circulation means When the electrical conductivity measured by the electrical conductivity measuring device is less than a preset threshold value, the raw water makeup water circulation by the raw water makeup water circulation means or the softened water makeup water circulation is performed. A concentration determination unit for stopping the circulation of the softened water replenishment water by means,
Flow rate control for controlling the flow rate of the raw water makeup water by the raw water makeup water circulation means and / or the flow rate of the softened water makeup water by the softened water makeup water circulation means based on the hardness of the spray water measured by the hardness measuring device. Means,
Equipped with a,
The hardness measuring device measures calcium hardness as hardness,
The flow rate control means is configured to stop the flow of the softened water makeup water when the calcium hardness of the spray water measured by the hardness measuring device is lower than a predetermined lower limit threshold. the water treatment system that controls the raw makeup water distribution means as well as controlling and starts the flow of the raw water supply water. The flow rate control means controls the raw water makeup water circulation means to stop the circulation of the raw water makeup water when the calcium hardness of the spray water measured by the hardness measuring device is higher than a predetermined upper threshold. The water treatment system according to claim 3 , wherein the softened water makeup water circulation means is controlled to start the circulation of the softened water makeup water.

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