JP5720864B2 - Drug supply device - Google Patents

Description

  The present invention relates to a drug supply device that supplies a drug to a circulating water system provided in an industrial facility.

  Conventionally, various industrial facilities having a circulating water system are installed in commercial buildings, industrial plants, and the like. For example, a cooling tower is known as an industrial facility having a circulating water system. The cooling tower is connected to a cooled apparatus such as a heat exchanger incorporated in an air conditioner or a refrigerator. Cooling water for cooling these devices circulates in the circulating water system. The cooling water circulates in the circulating water system while being cooled by the cooling tower (hereinafter, the circulating cooling water is also referred to as “circulating water”). That is, the circulating water circulates between the cooling tower and the apparatus to be cooled through the circulating water system.

  When the circulating water is cooled by the cooling tower, a part of the circulating water evaporates. Therefore, when circulating water is continuously circulated, the concentration of circulating water gradually increases and the water quality deteriorates. Therefore, blow-down processing is performed to improve the quality of the circulating water. The blow-down process is a process for periodically supplying fresh makeup water from the outside and diluting the circulating water by discharging a part of the highly concentrated circulating water to the outside. In addition, when the blow-down process is executed, a process of supplying a chemical such as a scale inhibitor or an anticorrosive agent to the circulating water or makeup water (hereinafter also referred to as “medicine injection process”) is also executed.

  Conventionally, a technique for reducing waste of chemicals supplied to circulating water or makeup water has been proposed. For example, there has been proposed a chemical injection control device that does not execute chemical injection processing during blow-down processing, and performs chemical injection processing with a dose of chemical proportional to the execution time of blow-down processing after the completion of blow-down processing. (See Patent Documents 1 and 2).

Japanese Patent Laid-Open No. 11-63746 JP 2011-247447 A

  In the conventional chemical injection control device described above, the chemical injection process is not executed during the blow-down process. The chemical injection process is executed after the blow-down process is completed. While the medicine injection process is being executed, the next blow-down process may be executed. In that case, in the conventional chemical injection control device, since the chemical injection processing is continuously executed, the medicine supplied during the execution of the next blow-down processing is immediately discharged out of the system together with a part of the circulating water. There is. Therefore, in the conventional medicine injection control device, there is a possibility that the medicine is wasted.

  Therefore, an object of this invention is to provide the chemical | medical agent supply apparatus which can suppress that a chemical | medical agent is consumed wastefully by the blowdown process started during execution of the stopped chemical injection process.

  The present invention detects flow rate of makeup water supplied to a circulating water system through which circulating water circulates, and outputs a flow rate detecting means for outputting the detected water volume value, and a drug capable of executing a drug supply process for supplying a drug to the circulating water system A supply means, and a medicine supply control section for causing the medicine supply means to execute the medicine supply process so that an input amount of the medicine proportional to the detected water amount value output from the flow rate detection means is supplied to the circulating water system; A storage unit that stores an amount of medicine that has not been supplied from the medicine supply means to the circulating water system in the medicine supply process, and the medicine supply control unit (i) supplies makeup water to the circulating water system. If it is during the execution period of the blow-down process that discharges a part of the circulating water flowing through the circulating water system to the outside, the execution of the chemical supply process is waited, and the blow-down process After the completion, the medicine supply means executes the medicine supply process so that an amount of medicine proportional to the detected water amount detected during the blow-down process is supplied to the circulating water system, ii) When the next blow-down process is executed during the execution of the drug supply process, the execution of the drug supply process is interrupted, and the drug that has not been supplied to the circulating water system in the drug supply process is input. An amount of medicine is stored in the storage unit, and after the completion of the next blow-down process, the amount of medicine input stored in the storage unit and detection detected during the execution period of the next blow-down process The present invention relates to a medicine supply device that causes the medicine supply means to execute the medicine supply process so that a total amount of medicine that is added to the amount of medicine proportional to the amount of water is supplied to the circulating water system. .

Moreover, it is preferable that the said chemical | medical agent supply control part calculates the injection amount of a chemical | medical agent based on Formula (1).
W = V × C ÷ N ÷ D (1)
W: amount of drug input V: detected water amount value of makeup water C: maintenance concentration of drug in circulating water N: concentration rate of circulating water D: density of drug

The circulating water system is connected to a cooling tower that cools the circulating water including the supplied makeup water and supplies the cooled circulating water to the apparatus to be cooled, detects the electrical conductivity of the circulating water, 1st electrical conductivity detection means which outputs as 1 detection electrical conductivity value, and 2nd electrical conductivity detection means which detects electrical conductivity of make-up water and outputs as 2nd detection electrical conductivity value The medicine supply control unit obtains the first detected electric conductivity output from the first electric conductivity detecting means and the second detected electric conductivity output from the second electric conductivity detecting means. The concentration rate of the circulating water is preferably calculated based on the formula (2).
N = E1 ÷ E2 (2)
E1: First detected electric conductivity value E2: Second detected electric conductivity value

  In addition, when the circulating water is circulated through the circulating water system and the period during which the makeup water is not supplied to the circulating water system exceeds a preset allowable period, the chemical supply control unit, Regardless of the amount of makeup water, it is preferable to execute the medicine supply process with a preset input amount.

  Moreover, it is preferable that the said chemical | medical agent supply means supplies a disinfectant as a chemical | medical agent supplied to the said circulating water system in the said chemical | medical agent supply process.

  ADVANTAGE OF THE INVENTION According to this invention, the chemical | medical agent supply apparatus which can suppress that a chemical | medical agent is consumed wastefully by the blowdown process started during execution of the stopped chemical injection process can be provided.

It is a schematic structure figure showing cooling system 1 of an embodiment. It is a functional block diagram concerning control of cooling system 1 of an embodiment. 1 is a schematic configuration diagram of a medicine supply device 300. FIG. 6 is a time chart showing the timing of executing a medicine injection process in the medicine supply device 300. It is a time chart which shows the place timing which performs an auxiliary | assistant medicine injection process in the chemical | medical agent supply apparatus. 4 is a flowchart showing a processing procedure when a blow process is executed in the system control unit 100. 5 is a flowchart showing a processing procedure when a medicine injection process is executed in the medicine supply device 300. It is a flowchart which shows the process sequence in the case of performing an auxiliary | assistant medicine injection process in the chemical | medical agent supply apparatus 300. FIG. It is a flowchart which shows the process sequence in the case of performing an auxiliary | assistant medicine injection process in the chemical | medical agent supply apparatus 300. FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In this embodiment, a cooling system to which the medicine supply device according to the present invention is applied will be described. FIG. 1 is a schematic configuration diagram showing a cooling system 1 of the present embodiment. FIG. 2 is a functional block diagram relating to the control of the cooling system 1. FIG. 3 is a schematic configuration diagram of the medicine supply device 300.

  As shown in FIG. 1, the cooling system 1 of the present embodiment circulates circulating water W2 (cooling water) in order to cool a cooled device 131 such as a heat exchanger incorporated in an air conditioner or a refrigerator. System. During operation of the cooling system 1, the circulating water W <b> 2 is circulated and used while being cooled by the cooling tower 120. The circulating water W2 is replenished from the outside by the evaporation, scattering, blowdown processing (described later), and the like. In the present embodiment, the cooling tower 120 as an industrial facility is a so-called open type cooling tower.

  The cooling system 1 of the present embodiment includes, as main components, a cooling tower 120, a cooled device 131, and a first electrical conductivity sensor (hereinafter referred to as “first EC sensor”) as first electrical conductivity detection means. ) 133, a medicine supply device 300, a second electrical conductivity sensor (hereinafter also referred to as “second EC sensor”) 139 as a second electrical conductivity detection unit, and a system control unit 100. The cooling system 1 includes a circulating water line L110 and a makeup water line L120 as main lines. “Line” is a general term for lines capable of flowing fluid such as flow paths, paths, and pipelines. In FIG. 1, the path of electrical connection is indicated by a broken line.

  The cooling tower 120 is a facility for supplying the makeup water W1, supplying the makeup water W1 as the circulating water W2 to the cooled device 131, and cooling the circulating water W2 collected (returned) from the cooled device 131. is there. The cooling tower 120 includes a tower main body 121 and a storage unit 122. The cooling tower 120 and the circulating water line L110 constitute a circulating water system.

  The tower main body 121 is a casing that forms an outer shell of the cooling tower 120. The tower main body 121 has a circulating water cooling unit (not shown) including a watering unit, a fan, an opening, a louver, a filler, and the like. The circulating water W2 is cooled by the circulating water cooling unit and falls into the storage unit 122.

  The storage part 122 is a site | part which stores the circulating water W2 cooled by the circulating water cooling part. The storage part 122 is provided in the lower part of the tower main body 121. A circulating water supply line L111 (described later) of the circulating water line L110 is connected to the bottom of the storage unit 122. The circulating water W2 stored in the storage unit 122 is supplied to the cooled apparatus 131 via the circulating water supply line L111. The storage unit 122 is provided with a water tap 137 and an overflow port 138 that are used in the blow-down process.

  The circulating water line L110 is a line that circulates the circulating water W2 between the cooling tower 120 and the apparatus to be cooled 131. The circulating water line L110 includes a circulating water supply line L111 and a circulating water recovery line L112.

  The circulating water supply line L111 connects between the storage unit 122 and the apparatus to be cooled 131. The circulating water W2 in the storage unit 122 is supplied to the cooled device 131 via the circulating water supply line L111.

  A circulating water pump 132 is provided in the middle of the circulating water supply line L111. The circulating water pump 132 can send out the circulating water W2 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 pump 132 is electrically connected to the system control unit 100. The operation (drive and stop) of the circulating water pump 132 is controlled by a pump operation signal output from the system control unit 100.

  The circulating water recovery line L112 is a line that connects between the cooled device 131 and the tower body 121. The circulating water W2 heated by heat exchange in the apparatus to be cooled 131 is recovered by the circulating water cooling unit (not shown) of the tower body 121 through the circulating water recovery line L112.

  The to-be-cooled device 131 is various devices such as a heat exchanger that needs to be cooled by the circulating water W2. The apparatus to be cooled 131 is, for example, a turbo chiller or an absorption chiller for various chemical plants, an air conditioner chiller for buildings, a cold water production machine or a vacuum chiller for food factories, and the like.

  In the cooled device 131, the downstream end of the circulating water supply line L111 is connected to one end of the circulating water flow path. In the cooled device 131, the upstream end of the circulating water recovery line L112 is connected to the other end of the circulating water flow path.

The first EC sensor 133 is a device that measures the quality of the circulating water W2 in the storage unit 122 and outputs it as a first detected electrical conductivity value. The first EC sensor 133 is electrically connected to the system control unit 100. The first detected electrical conductivity value measured by the first EC sensor 133 (hereinafter also referred to as “first electrical conductivity EC ₁ ”) is transmitted to the system control unit 100. The first EC sensor 133 measures the electric conductivity of the circulating water W2 in real time, and transmits the first electric conductivity EC ₁ to the system control unit 100. The first electrical conductivity EC ₁ measured at the 1EC sensor 133 is also transmitted to the medicine supply apparatus 300 via the system control unit 100.

  The medicine supply device 300 is a device capable of performing a chemical injection process for supplying medicine such as a scale inhibitor, an anticorrosive agent, and a bactericidal agent to the circulating water W2 in the storage unit 122. The medicine supply device 300 is connected to the storage unit 122 via a medicine supply line L140. The medicine supply device 300 is electrically connected to the system control unit 100. The configuration of the medicine supply device 300 will be described in detail later.

  The scale inhibitor is a compound used to prevent scale growth in water or scale deposition on a pipe surface or the like. The anticorrosive is a compound mainly used for suppressing the occurrence of general corrosion in the piping system or the like, or partial corrosion such as pitting. A disinfectant is a compound used to suppress the growth of microorganisms in water and is also called a slime control agent. In the present embodiment, the scale inhibitor, anticorrosive, and bactericidal agent are collectively referred to as “drug” or “drug W3”.

The scale inhibitor, anticorrosive, and bactericidal agent are provided as, for example, a one-pack type multi-drug, and are supplied to the storage unit 122 from a drug tank 330, a drug supply pump 350, and a drug supply line L140 (all described later).
The configuration of the medicine supply device 300 will be described in detail later.

  The medicine supply line L140 is a line that supplies the medicine W3 to the storage unit 122. The upstream end of the medicine supply line L140 is connected to a discharge port of a medicine supply pump 350 (described later). The downstream end of the medicine supply line L140 is connected to the storage unit 122.

  In addition, a makeup water line L120 is connected to the cooling tower 120. The makeup water line L120 is a line for replenishing the reservoir 122 with the makeup water W1. The makeup water line L120 includes a first makeup water line L121 on the upstream side, and a second makeup water line L122 and a third makeup water line L123 on the downstream side. The first makeup water line L121 is connected to a supply source (not shown) of makeup water W1 such as tap water and industrial water. The makeup water line L120 is branched into the second makeup water line L122 and the third makeup water line L123 at the branch portion J3. The branch portion J3 is disposed between the connection portion J4 (described later) and the cooling tower 120.

  A flow sensor 135 is connected to the first makeup water line L121. The flow sensor 135 is a device that detects the flow rate per unit time of the makeup water W1 that flows through the first makeup water line L121. The flow sensor 135 is connected to the first makeup water line L121 at the connection portion J4. The connection portion J4 is disposed between the connection portion J5 (described later) and the branch portion J3. As the flow rate sensor 135, for example, a pulse transmission type flow rate sensor in which an axial flow impeller or a tangential impeller (not shown) is disposed in the flow path housing can be used.

  The pulse transmission type flow sensor used in the present embodiment includes an impeller in which the tip portions of even-numbered blades are alternately magnetized to N and S poles. The pulse transmission type flow rate sensor outputs a pulse signal having a time width proportional to the flow rate of the makeup water W1 by detecting the rotation of the impeller with the Hall IC. The Hall IC is an electronic circuit in which a voltage regulator, a Hall element, an amplifier circuit, a Schmitt trigger circuit, an output transistor, and the like are packaged. This electronic circuit outputs a rectangular wave pulse signal as a detected water amount value every time the impeller rotates once in response to a change in magnetic flux accompanying the rotational movement of the impeller. The flow rate [L / pulse] when the impeller rotates once is determined by the design specification of the flow rate sensor. Therefore, a medicine injection control unit 311 (described later) of the medicine supply device 300 can calculate the makeup water amount [L] of the makeup water W1 based on the pulse signal output from the flow sensor 135.

  For example, in the flow rate sensor 135, when the flow rate when the impeller rotates once is 1 [L], if the number of pulse signals output from the flow rate sensor 135 is 3 pulses, the makeup water amount of the makeup water W1 Becomes 3 [L].

  The flow sensor 135 is one of the devices constituting the medicine supply device 300. The flow sensor 135 is electrically connected to the medicine supply device 300. The pulse signal output from the flow sensor 135 is transmitted to the medicine supply device 300.

A second EC sensor 139 is connected to the first makeup water line L121. The second EC sensor 139 is a device that measures the water quality of the makeup water W1 flowing through the first makeup water line L121 and outputs it as a second detected electrical conductivity value. The second EC sensor 139 is connected to the first makeup water line L121 at the connection portion J5. The connecting portion J5 is disposed between the supply source (not shown) of the makeup water W1 and the connecting portion J4. The second EC sensor 139 is electrically connected to the system control unit 100. The second detected electrical conductivity value measured by the second EC sensor 139 (hereinafter also referred to as “second electrical conductivity EC ₂ ”) is transmitted to the system control unit 100. The 2EC sensor 139, an electrical conductivity of supplementary water W1 is measured in real time, and transmits the system control unit 100 to the second electrical conductivity EC _2. Note that the second electrical conductivity EC ₂ measured at the 2EC sensor 139 is also transmitted to the medicine supply apparatus 300 via the system control unit 100.

  The downstream end of the second makeup water line L122 is connected to the tower body 121. In the second makeup water line L122, a makeup water valve 136 is provided between the branch portion J3 and the cooling tower 120.

  The makeup water valve 136 can open and close the second makeup water line L122. By opening the second makeup water line L122, the makeup water W1 can be forcibly supplied to the storage section 122. The makeup water valve 136 is electrically connected to the system control unit 100. The open / close state of the makeup water valve 136 is controlled by a valve drive signal output from the system control unit 100 (blow-down process control unit 200). By making the makeup water valve 136 open, the second makeup water line L122 can be opened. The second makeup water line L122 can be closed by closing the makeup water valve 136.

  The downstream end of the third makeup water line L123 is connected to the tower body 121. A water faucet 137 is provided at the downstream end of the third makeup water line L123. The water tap 137 is a ball tap type water supply facility that manages the water level (that is, the amount of water) of the circulating water W <b> 2 in the storage unit 122. When the water level in the storage unit 122 decreases due to evaporation and scattering of the circulating water W2, the ball tap of the water tap 137 operates, and the supply water W1 flowing through the third supply water line L123 is supplied to the storage unit 122.

  The drain line L <b> 130 is attached substantially vertically inside the storage unit 122. The drain line L <b> 130 extends further downward from the storage unit 122. The upstream end of the drain line L130 forms an overflow port 138 for the circulating water W2. The overflow port 138 opens above the control water level of the water tap 137. On the other hand, the downstream end of the drain line L130 communicates with the outside of the reservoir 122. The drainage line L130 is a line that discharges the circulating water W2 overflowing from the storage unit 122 when the makeup water valve 136 is opened and the makeup water W1 is forcibly supplied in a blow-down process described later. is there.

  In the above configuration, the blow-down process for discharging a part of the circulating water W2 from the cooling tower 120 to the outside while supplying the makeup water W1 to the cooling tower 120 by opening the makeup water valve 136 is performed. Can do.

  Next, functions related to the control of the cooling system 1 will be described with reference to FIG.

  The system control unit 100 controls the operation of each part in the cooling system 1. As shown in FIG. 2, the system control unit 100 is electrically connected to, for example, the circulating water pump 132, the medicine supply device 300, and the makeup water valve 136.

  The system control unit 100 is electrically connected to each measurement device of the cooling system 1 and receives measurement information from these measurement devices. For example, the system control unit 100 is electrically connected to a first EC sensor 133, a second EC sensor 139, and a flow sensor 135 as measurement devices. In the system control unit 100, the latest measurement information received from each measurement apparatus is stored in the memory 210 as appropriate.

  The system control unit 100 includes a blow-down process control unit 200 and a memory 210. The function of the blowdown processing control unit 200 in the system control unit 100 is realized by a microprocessor (not shown) including a CPU and an internal memory.

Blowdown processing control unit 200, when the first electrical conductivity EC ₁ circulating water W2 detected by the 1EC sensor 133, reaches a preset upper threshold _{EC b1} above, controls the makeup water valve 136 Then, the blow-down process of the circulating water W2 is executed. The upper threshold EC _b1 is determined in consideration of, for example, a concentration factor that can ensure the durability of the effects of the scale inhibitor and the anticorrosive.

The blow-down process control unit 200 performs drainage of the circulating water W2 and replenishment of the makeup water W1 simultaneously (or continuously) as the blow-down process. Specifically, the blow-down process control unit 200 opens the makeup water valve 136 when the first electrical conductivity EC ₁ ≧ the upper limit threshold EC _b1 , that is, when the quality of the circulating water W2 deteriorates. The fresh supply water W1 is forcibly supplied to the storage unit 122 through the second supply water line L122. When the replenishing water W1 is replenished, the water level of the storage unit 122 rises, so that the circulating water W2 overflowing from the overflow port 138 is discharged to the outside through the drain line L130. In other words, when the blow-down process is executed, a part of the circulating water W2 that has been concentrated is replaced with the makeup water W1. Therefore, circulating water W2 which flows through the circulating water line L110, the first electrical conductivity EC ₁ is lowered as a whole.

Then, the blow-down processing control unit 200 opens the makeup water valve 136 and then the first electrical conductivity EC ₁ ≦ the lower limit threshold EC _b2 , that is, when the water quality of the circulating water W2 is restored, The replenishment water valve 136 is closed to stop the replenishment of the replenishment water W1. Naturally, the relationship between the upper limit threshold EC _b1 that is the start point of the blow-down process and the lower limit threshold EC _b2 that is the end point of the blow-down process is such that the upper limit threshold EC _b1 > the lower limit threshold EC _b2 .

  The blow-down process control unit 200 outputs an external stop signal (interlock signal) to the medicine supply device 300 when executing the blow-down process. The external stop signal is a signal for notifying execution (start) of blowdown processing. Further, the blow-down process control unit 200 stops outputting an external stop signal to the medicine supply device 300 when the blow-down process is completed.

The memory 210 is a storage device that stores various data relating to blowdown processing and the like. For example, the memory 210 includes a first electrical conductivity EC ₁ (updated value) measured by the first EC sensor 133, a second electrical conductivity EC ₂ (updated value) measured by the second EC sensor 139, and a blow-down process. The upper limit threshold EC _b1 (set value) that is the start point of the lower limit threshold EC _b2 (set value) that is the end point of the blow-down process, a control program for executing the blow-down process, and the like are stored.

Next, the configuration of the medicine supply device 300 will be described in detail with reference to FIG.
As shown in FIG. 3, the medicine supply device 300 includes a medicine injection control unit 310, a flow rate sensor 135, a medicine tank 330, and a medicine supply pump 350 as main components. Among these, the medicine tank 330 and the medicine supply pump 350 constitute the medicine supply means in the present invention.

  First, the configuration of the control system of the medicine supply device 300 will be described. The chemical injection control unit 310 includes a chemical injection control unit 311 as a chemical supply control unit, a timer unit 312, and a memory 320. Each function of the chemical injection control unit 311 and the time measuring unit 312 in the chemical injection control unit 310 is realized by a microprocessor (not shown) including a CPU and an internal memory. In the present embodiment, the system control unit 100 is mounted on the medicine supply device 300 and shares information such as various measurement values and control states between the system control unit 100 and the medicine injection control unit 310.

  The chemical injection control unit 311 calculates the makeup water amount of the makeup water W <b> 1 based on the pulse signal output from the flow sensor 135. The chemical injection control unit 311 then performs a chemical injection process (flow rate chemical injection process) in the chemical supply pump 350 so that an input amount of the chemical W3 proportional to the calculated supplemental water amount of the supplementary water W1 is supplied to the circulating water W2. Is executed.

  Specifically, the medicine injection control unit 311 counts the number of pulse signals output from the flow sensor 135. Then, every time the number of counted pulse signals (hereinafter also referred to as “number of pulse signals”) reaches a predetermined number of pulse signals, the medicine injection control unit 311 inputs the amount proportional to the number of pulse signals (the amount of makeup water). A pump drive signal is output to the medicine supply pump 350 (described later) so that the medicine W3 is supplied to the circulating water W2 (frequency division control). Thereby, in the medicine supply device 300, the medicine injection process is executed.

  In addition, every time one pulse signal is output from the flow sensor 135 in the medicinal control unit 311, the medicating process is repeatedly performed a plurality of times so that a predetermined amount of chemical is supplied to the circulating water W <b> 2. Good (counter control).

  The medicine injection control unit 311 outputs a pump drive signal having a pulse width corresponding to the calculated amount of medicine to be supplied to the medicine supply pump 350. Thereby, in the medicine supply pump 350, the medicine is supplied with the designated number of strokes over the period (operation time) of the pulse width of the pump drive signal output from the medicine injection control unit 311. By this operation, a required amount of medicine W3 is supplied from the medicine tank 330 to the circulating water W2.

  If the blow-down process by the blow-down process control unit 200 (system control unit 100) is being executed, the chemical-feed control unit 311 waits for the execution of the drug-feed process until the blow-down process is completed. The medicinal injection control unit 311 then dispenses the medicinal injection so that an amount of the medicine W3 proportional to the amount of makeup water detected during the execution period of the blowdown process is supplied to the circulating water W2 after the blowdown process is completed. Execute the process.

  When the external stop signal is output from the blow-down process control unit 200, the medicine injection control unit 311 determines that the blow-down process has been started (executed). Moreover, the chemical injection control part 311 determines with the blowdown process having been complete | finished, when the output of an external stop signal from the blowdown process control part 200 stops.

  Moreover, the chemical injection control part 311 interrupts execution of a chemical injection process, when the next blow down process is performed during execution of the chemical injection process made to wait. Here, the medicinal injection control unit 311 causes the memory 320 to store the amount of the medicine that has not been supplied to the circulating water W2 in the interrupted medicating process. In addition, the medicine injection control unit 311 counts the number of pulse signals output from the flow rate sensor 135 as the number of pulse signals P during the next blow-down process. Thereby, the chemical injection control part 311 can calculate the amount of replenishment water in the execution period of the blowdown process after the completion | finish of the next blowdown process.

  Then, after the next blow-down process is completed, the medicine injection control unit 311 stores the amount of medicine stored in the memory 320 and the number of pulse signals P (replenishment) detected during the execution period of the next blow-down process. The pulse width corresponding to the total amount of the drug W3 is set so that the total amount of the drug W3 (hereinafter also referred to as “total amount”) proportional to the amount of water) is supplied to the circulating water W2. A pump drive signal having the same is output to the medicine supply pump 350.

The medicinal injection control unit 311 calculates a dose W [mL] of the medicine proportional to the replenishment water amount [L] based on the following equation (1).
W = V × C ÷ N ÷ D (1)
W: Amount of drug input [mL]
V: Detected water amount value of makeup water W1 [L]
C: Maintenance concentration of drug in circulating water W2 [mL / L]
N: Concentration magnification of circulating water W2 [−]
D: Drug density [mg / mL]
Here, the maintenance concentration of the drug is the amount of drug per unit replenishment water amount.

Moreover, the chemical injection control part 311 calculates the concentration magnification N of the circulating water W2 in Formula (1) based on the following formula (2).
N = E1 ÷ E2 (2)
N: Concentration magnification of circulating water W2 [−]
E1: First detected electric conductivity value [mS / m]
E2: Second detected electric conductivity value [mS / m]

The first detection electric conductivity value E1 is a first electrical conductivity EC ₁ of the circulating water W2 outputted from the 1EC sensor 133. The second detection electric conductivity value E2 is a second electrical conductivity EC ₂ makeup water W1 outputted from the first 2EC sensor 139. The first electrical conductivity EC ₁ and the second electrical conductivity EC ₂ are transmitted to the medicine supply device 300 via the system control unit 100.

  Agents such as scale inhibitors and anticorrosive agents need to keep an appropriate concentration in the circulating water W2. When the variation of the drug concentration is large, a sufficient effect cannot be obtained. Accordingly, in the chemical injection management of the circulating water W2, it is necessary to keep the drug concentration higher than the drug maintenance concentration at which the drug exhibits an effect. The required amount of drug in conventional chemical injection management has been determined based on a state where the drug is not most concentrated in the circulating water W2, that is, a state where the concentration rate of the circulating water W2 is the lowest. In other words, the required amount of medicine in conventional drug administration has been operated as a fixed value. However, since the electrical conductivity of the circulating water W2 and the makeup water W1 both vary with time, the concentration rate of the circulating water W2 is not a constant value. Therefore, in the conventional chemical injection management, when the concentration rate of the circulating water W2 is increased, the drug concentration exceeds the drug maintenance concentration. Therefore, in the conventional chemical injection management, there is a possibility that the excess medicine is wasted. On the other hand, the chemical injection control unit 311 of the present embodiment adjusts the required amount of the medicine following the change in the concentration rate of the circulating water W2.

First, the electrical conductivity of the circulation water W2 (first electric conductivity EC ₁₎ is a case in which fluctuations, explaining its effect. In the cooling system 1 of the present embodiment, the first electrical conductivity EC ₁ of the circulating water W2 during operation of the cooling tower 120, transitions between the upper threshold _{EC b1} lower limit threshold _{EC b2} by blowdown processing control unit 200 To be managed. For example, the drug maintenance concentration is set to 200 mg / L, the upper threshold EC _b1 is set to 120 mS / m, the lower threshold EC _b2 is set to 100 mS / m, the drug density is 1.15 mg / mL, and the electrical conductivity of the makeup water W1 is 20 mS. Assume the case of / m. When the concentration of the circulating water W2 progresses and the first electric conductivity EC ₁ = the upper limit threshold EC _b1 is reached, the concentration rate of the circulating water W2 is 6, and the required amount of the drug is 29 mL / L. On the other hand, when the blow-down process is executed and the first electrical conductivity EC ₁ = the lower limit threshold EC _b2 is reached, the concentration rate of the circulating water W2 is 5, and the required amount of the drug is 35 mL / L. That is, the medicinal injection control unit 311 adjusts the required amount of the medicine in the range of 35 to 29 mL / L following the change in the concentration rate of the circulating water W2 in the range of 5 to 6. Therefore, according to the cooling system 1 of the present embodiment, wasteful use of the drug can be suppressed while maintaining the drug maintenance concentration at 200 mg / L.

Next, when the second electrical conductivity EC ₂ makeup water W1 is varied, it will be described the effects. Second electrical conductivity EC ₂ makeup water W1 is the case of using industrial water and groundwater in the makeup water W1, seasonal factors (e.g., rainfall) varies with such. The second electrical conductivity EC ₂ makeup water W1 is the industrial water and groundwater, reuse water (e.g., pure water used for washing) When a blend of being a makeup water W1, the reuse water It varies depending on the recovery rate.

For example, the drug maintenance concentration is set to 200 mg / L, the drug density is 1.15 mg / mL, the electrical conductivity of the circulating water W2 is 110 mS / m, and the fluctuation range of the electrical conductivity of the makeup water W1 is 15 to 25 mS / m. Assume that m. When the quality of the makeup water W1 is good and the second electrical conductivity EC _{2 is} 15 mS / m, the concentration rate of the circulating water W2 is 7.3, and the required amount of the drug is 24 mL / L.

On the other hand, when the water quality of the makeup water W1 deteriorates and the second electrical conductivity EC ₂ = 25 mS / m, the concentration rate of the circulating water W2 is 4.4, and the required amount of the drug is 40 mL / L. Become. That is, the medicinal injection control unit 311 adjusts the required amount of the drug in the range of 40 to 24 mL / L following the change in the concentration rate of the circulating water W2 in the range of 4.4 to 7.3. Therefore, according to the cooling system 1 of the present embodiment, wasteful use of the drug can be suppressed while maintaining the drug maintenance concentration at 200 mg / L.

In addition, in the medicinal injection control unit 311, the calculation of the concentration factor N by the expression (2) is such that the first detected electrical conductivity value E1 (first electrical conductivity EC ₁ ) of the circulating water W2 is equal to or greater than a preset specified value. This is applied in the case of (for example, the lower threshold EC _b2 or more). For example, the start of operation and immediately after installing the cooling system 1, in such case of replacing the circulating water W2 total of first conductivity EC ₁ and the second electrical conductivity EC ₂ is substantially equal. At that time, if an attempt is made to achieve the drug maintenance concentration based on the concentration rate calculated by the equation (2), the amount of the drug to be calculated calculated by the equation (1) becomes excessively large. Therefore, when the first electrical conductivity EC ₁ is less than a preset specified value, the medicine injection control unit 311 determines a predetermined basic input set based on the basic input concentration of the medicine and the amount of water held in the circulating water system. Dosage in bulk.

In addition, the chemical injection control unit 311 is in operation of the cooling tower 120, and when the period during which the makeup water W1 is not supplied to the cooling tower 120 (residence time T _T described later) exceeds a preset allowable period. Causes the medicine supply pump 350 to execute a medicine injection process (hereinafter also referred to as “auxiliary medicine injection processing”). In the auxiliary medicine injection process, a preset amount of medicine W3 is supplied to the circulating water W2. In the present embodiment, a bactericidal agent is supplied to the circulating water W2 in the auxiliary drug injection process. In addition, in a supplementary chemical injection process, you may supply together with a scale inhibitor, an anticorrosive, and a bactericidal agent similarly to a normal chemical injection process.

  The chemical injection control unit 311 determines the operation state of the cooling tower 120 based on the pump operation signal output from the system control unit 100 to the circulating water pump 132. That is, the chemical injection control unit 311 determines that the cooling tower 120 is in operation when a pump operation signal is output from the system control unit 100 to the circulating water pump 132. In addition, when the pump operation signal is not output from the system control unit 100 to the circulating water pump 132, the chemical injection control unit 311 determines that the cooling tower 120 is stopped. The pump operation signal is also transmitted from the system control unit 100 to the chemical injection control unit 311.

A period during which the makeup water W1 is not supplied to the cooling tower 120 (hereinafter also referred to as “residence time T _T ”) is measured by a timer unit 312 (described later). Dosing control unit 311, the time elapsed from the reception of the pulse signal from the flow rate sensor 135, thereby counting the residence time T _T to the clock unit 312. The dosing control unit 311, when counting residence time T _T of the timer unit 312 exceeds a preset allowable residence time T _W, so that the drug prescribed charging amount is supplied to the circulating water W2 The chemical injection process is executed.

If no pulse signal is received from the flow sensor 135, the chemical injection control unit 311 notifies the time measuring unit 312 that the pulse signal is not output from the flow sensor 135 and starts measuring the residence time T _T. . Also, dosing control unit 311 before clocking residence time T _T of the timer unit 312 exceeds a preset allowable residence time T _W, when the flow rate sensor 135 receives the next pulse signal, The time sensor 312 is notified that the pulse signal has been output from the flow sensor 135, and the time measurement of the residence time T _{T in} the time measurement unit 312 is reset.

  When the blow-down process is executed while the auxiliary drug injection process is being executed, the chemical injection control unit 311 ends the execution of the auxiliary drug injection process. In this case, the amount of the medicine that is proportional to the amount of replenishing water during the execution period of the blow-down process is calculated based on the above-described formulas (1) and (2), similar to the medicine injection process described above. The

Timing unit 312, a period in which makeup water W1 is not supplied to the cooling tower 120, for measuring the residence time _{T T.} Specifically, the time measuring unit 313 starts measuring the residence time T _T when notified from the drug injection control unit 311 that no pulse signal is output from the flow sensor 135. Further, timer unit 313 is notified from the chemical feeding, chemical dosing control unit 311 that the pulse signal is outputted at a flow rate sensor 135, to stop the counting of the retention time T _T. The timer unit 312 stores the measured residence time T _T in the memory 320. Further, timer unit 312, makeup water W1 in measurement of the residence time T _T is supplied to the cooling tower 120, the pulse signal in the flow rate sensor 135 is notified that the output from the chemical feeding, chemical dosing control unit 311, a timer reset residence time _{T T} of the (e.g., step ST306 of FIG. 8 to be described later).

The memory 320 is a storage device that stores various data related to the chemical injection process. For example, in the memory 320, the number P of pulse signals counted by the medicinal injection control unit 311, the amount of medicine that has not been supplied to the circulating water W <b> 2 in the interrupted medicinal treatment process or the auxiliary medicinal treatment process, the time measuring unit 312. The control program for causing the residence time T _T measured in step S1, the chemical injection process, and the auxiliary chemical injection process to be executed is stored.

  Next, in the medicine supply device 300 shown in FIG. 3, the configuration of a line for supplying the medicine W3 to the circulating water W2 and its peripheral equipment will be described.

  The medicine tank 330 is a container that can store medicine inside. A level sensor 340 is provided inside the medicine tank 330. In addition, a medicine supply pump 350 is connected to the medicine tank 330.

  The level sensor 340 is a device that detects the liquid level (that is, the liquid amount) of the medicine in the medicine tank 330. Level sensor 340 is electrically connected to chemical injection control unit 310. The level sensor 340 outputs a level signal corresponding to the liquid level of the medicine in the medicine tank 330. The level signal output from the level sensor 340 is transmitted to the chemical injection control unit 310. When the level signal decreases from the full water level A and does not reach the set liquid level B, the chemical injection control unit 310 generates an alarm for a certain period of time, for example, and prompts the administrator to replenish the medicine.

  The drug supply pump 350 is a device that sends the drug W3 in the drug tank 330 toward the storage unit 122 via the drug supply line L140. The drug supply pump 350 of this embodiment is an electromagnetically driven diaphragm type metering pump. When an electromagnetically driven diaphragm type metering pump is used as the medicine supply pump 350, the medicine W3 is intermittently pushed into the medicine supply line L140 by reciprocating a diaphragm valve (not shown). As a result, since the pressure increases on the upstream side of the medicine supply line L140, the medicine W3 is discharged from the downstream side of the medicine supply line L140 to the storage unit 122.

  The medicine supply pump 350 sets the discharge amount [mL / stroke] per stroke of the diaphragm valve to a predetermined value and increases / decreases the number of strokes [stroke / min], thereby discharging the medicine discharge flow rate [mL / min]. Can be adjusted. The number of strokes refers to the number of times the diaphragm valve reciprocates per unit time, and one reciprocation corresponds to one stroke. The chemical supply pump 350 is electrically connected to the chemical injection control unit 311 (chemical injection control unit 310). When a pump drive signal (pulse signal) is output from the medicine injection control unit 311, the medicine supply pump 350 has a specified number of strokes over a period of the pulse width (hereinafter also referred to as “operation time”). The injection of the drug is executed.

  In the present embodiment, an example will be described in which a one-component multi-drug containing a scale inhibitor, an anticorrosive, and a bactericide is supplied from one drug supply device 300 to the storage unit 122. When it is difficult to mix in one liquid due to the characteristics of the compound, a scale inhibitor, an anticorrosive, and a bactericidal agent may be supplied to the storage unit 122 from individual drug supply devices.

  The medicine supply line L140 is provided with a flow checker 141 and a check valve 142.

  The flow checker 141 is a device that detects the distribution state of the medicine W3 in the medicine supply line L140. The flow checker 141 is electrically connected to the medicine injection control unit 310. When the flow checker 141 detects that the medicine W3 is not properly distributed through the medicine supply line L140, the flow checker 141 transmits a detection signal to the medicine injection control unit 310. For example, when bubbles or solids are mixed in the medicine supply line L140 and the circulation of the medicine W3 is temporarily delayed, a blockage detection signal is transmitted from the flow checker 141 to the medicine injection control unit 310. The flow checker 141 is provided between the medicine tank 330 and the check valve 142 in the medicine supply line L140.

  The check valve 142 is a valve that regulates the flow direction of the medicine. The check valve 142 opens when the medicine W3 is pumped from the medicine tank 330 toward the storage section 122, and closes when the backflow occurs from the storage section 122. The check valve 142 is provided at a connection portion between the medicine supply line L140 and the storage unit 122.

  Next, the timing when the medicine supply device 300 described above executes the medicine injection process and the auxiliary medicine injection process will be described.

  First, the operation of the chemical injection control unit 311 when executing chemical injection processing (flow rate proportional chemical injection) will be described with reference to FIG. FIG. 4 (A) is a time chart when the chemical injection process (flow rate proportional chemical injection) is executed. FIG. 4B is a time chart when the chemical injection process is made to wait by the blow-down process. FIG. 4C is a time chart in the case where the next blow-down process is executed while the standby chemical injection process is being executed.

  In FIG. 4 and FIG. 5 (described later), “flow rate pulse” indicates a pulse signal output from the flow rate sensor 135. The “medicine injection operation” indicates the operation time of the drug supply pump 350 (drug supply apparatus 300). “Blowdown operation” indicates the open time of the makeup water valve 136 during the blowdown process. Further, the waveforms shown in FIGS. 4 and 5 show the respective time intervals with a conceptual length, and do not correspond to the actual time intervals. In addition, in the medicine injection operation, the amount of medicine to be supplied to the circulating water W2 is indicated by a pulse width proportional to the amount of introduction.

  As shown in FIG. 4A, every time the pulse signal (flow rate pulse) output from the flow rate sensor 135 reaches a predetermined number of pulse signals (for example, 3 pulses), the drug injection control unit 311 A pump drive signal is output to 350, and a chemical injection process (chemical injection operation) is executed.

Next, as shown in FIG. 4B, when the blow-down process A is executed, the medicine injection control unit 311 outputs a pump drive signal to the medicine supply pump 350 until the blow-down process A is completed. Is stopped, and the execution of the chemical injection process is waited. Dosing control unit 311 counts the number of pulse signals P ₁ output from the flow sensor 135 during execution of the blowdown process A. Then, the medicine injection control unit 311 is configured so that, after the blow-down process A is completed, the medicine input amount Q ₁ proportional to the counted number of pulse signals P ₁ (make-up water amount q ₁ ) is supplied to the circulating water W2. a pump drive signal having a pulse width corresponding to the input amount to Q ₁ drug output to drug supply pump 350. Thereby, in the medicine supply device 300, the medicine injection process a is executed.

As shown in FIG. 4B, when a pulse signal is output from the flow rate sensor 135 during the execution of the chemical injection process a, the chemical injection control unit 311 counts the number of pulse signals (replenishment water amount q ₃ ). is input amount Q ₃ proportional to drug to be supplied to the circulating water W2, it outputs a pump drive signal having a pulse width corresponding to the input amount Q ₃ of the drug to the drug supply pump 350. For this reason, in the medicine injection process a, a pump drive signal having a pulse width corresponding to the input amount Q ₁ + Q ₃ of the medicine is output to the medicine supply pump 350.

Next, as shown in FIG. 4 (C), when the next blow-down process B is executed while the medicine injection process a waited in FIG. 4 (B) is being executed, the medicine injection control unit 311 stops the output of the drive signal to the medicine supply pump 350 until the blow-down process B ends, and interrupts the execution of the medicine injection process a. Dosing control unit 311 counts the number of pulse signals P ₂ output from the flow sensor 135 during execution of the blowdown process B. Also, dosing control unit 311 stores the input amount Q _X of drug that is not supplied to the circulating water W2 in the dosing process a which is interrupted in the memory 320.

The dosing control unit 311, after the end of the blowdown process B, had been stored in the memory 320, and a charged amount Q _X of drug that is not supplied to the circulating water W2 in the dosing process a, blowdown process The amount of medicine (and the amount of medicine input Q ₃ ) summed with the amount of medicine input Q ₂ (calculated value) proportional to the number of pulse signals P ₂ (the amount of makeup water q ₂ ) detected during the execution period of B A pump drive signal having a pulse width corresponding to the input amount of drug Q _X + Q ₂ + Q ₃ is output to the drug supply pump 350 so that W3 is supplied to the circulating water W2. Thereby, in the medicine supply device 300, the medicine injection process a ′ is executed (resumed).

  Next, operation | movement of the chemical injection control part 311 in the case of performing an auxiliary chemical injection process is demonstrated with reference to FIG. FIG. 5 is a time chart showing the timing of executing the auxiliary medicine injection process in the medicine supply device 300. In FIG. 5, the pulse signal (flow rate pulse) output from the flow rate sensor 135 is omitted.

As shown in FIG. 5, during the operation period of the cooling tower 120, after the blow-down process A is completed, the period during which the makeup water W1 is not supplied to the cooling tower 120, that is, the period during which no pulse signal is output from the flow sensor 135 (residence time). Suppose that T _T ) exceeds a preset allowable residence time T _W. In this case, the medicine injection control unit 311 outputs a pump driving signal to the medicine supply pump 350 to execute the auxiliary medicine injection processing b. In the auxiliary drug injection process, a pump drive signal is output from the drug injection control unit 311 to the drug supply pump 350 so that a preset amount of drug Q _S is supplied to the circulating water W2.

Further, during execution of auxiliary chemical feed process b, if the blow-down process B is executed, dosing control unit 311, without waiting for the completion of the drug supply input amount Q _S, the pump to the drug supply pump 350 The output of the drive signal is stopped and the execution of the auxiliary medicine injection process b is ended. Dosing control unit 311 counts the number of pulse signals P ₄ which is output from the flow sensor 135 during execution of the blowdown process B. Then, the medicine injection control unit 311, after the end of the blowdown process B, the medicine W3 with the input amount Q ₄ proportional to the number of pulse signals P ₄ (make-up water amount q ₄ ) detected during the execution period of the blowdown process B. There outputs to be supplied to the circulating water W2, the pump drive signal having a pulse width corresponding to the input amount Q ₄ drug W3 in drug supply pump 350. Thereby, the chemical injection process (flow rate proportional chemical injection) b ′ is executed.

Here, dosing control unit 311, for charged amount Q _X of not supplied to the circulating water W2 in was terminated adjuvants Note process b agents, it does not perform the dosing process. The supplementary chemical injection process is executed as a supplement to the decrease or loss of the medicinal effect associated with the long-term retention of the circulating water W2. When the blow-down process B is executed, a new medicine is supplied by the subsequent chemical injection process b ', and the medicine in the circulating water W2 is replaced. Therefore, after the end of the blowdown process B, it is also useless to put the drug beyond the input amount Q ₄ required in dosing process b'. Thus, for charged amount Q _X agents, it does not perform the dosing process.

  Next, the operation | movement of the blowdown process and chemical injection process performed in the cooling system 1 of this embodiment is demonstrated with reference to the flowchart shown to FIGS.

  First, the blowdown process will be described. FIG. 6 is a flowchart showing a processing procedure when blow-down processing is executed in the system control unit 100. The process of the flowchart shown in FIG. 6 is executed by the blow-down process control unit 200 based on the control program stored in the memory 210. 6 is repeatedly executed during operation of the cooling system 1.

In step ST101 shown in FIG. 6, the blow-down process control unit 200 sets the first electrical conductivity EC ₁ of the circulating water W2 measured by the first EC sensor 133 and the upper limit threshold EC _b1 that is the start point of the blow-down process. Obtained from the memory 210.

In step ST102, the blow-down process control unit 200 determines whether or not the first electrical conductivity EC ₁ is equal to or higher than the upper limit threshold EC _b1 . In step ST102, when the blow-down process control unit 200 determines that the first electrical conductivity EC ₁ ≧ the upper limit threshold EC _b1 (YES), the concentration of the circulating water W2 is set to a predetermined concentration. Therefore, the process proceeds to step ST103. In Step ST102, when the blowdown processing control unit 200 determines that the first electrical conductivity EC ₁ <the upper limit threshold EC _b1 (NO), the concentration of the circulating water W2 is a predetermined concentration. Therefore, the process returns to step ST101.

  In step ST103 (step ST102: YES), the blow-down process control unit 200 opens the makeup water valve 136 and starts the blow-down process.

By performing the blow-down process in step ST103, the makeup water W1 is forcibly replenished to the storage unit 122, while a part of the circulating water W2 in the storage unit 122 is discharged to the outside from the drain line L130. . Therefore, the first electrical conductivity EC ₁ of the circulating water W2 is gradually decreased.

In step ST104, the blow-down process control unit 200 acquires from the memory 210 the first electrical conductivity EC ₁ of the circulating water W2 measured by the first EC sensor 133 and the lower limit threshold EC _b2 that is the end point of the blow-down process. To do.

In step ST105, the blow-down process control unit 200 determines whether or not the first electrical conductivity EC ₁ is equal to or lower than the lower limit threshold EC _b2 . In this step ST105, when it is determined by the blow-down process control unit 200 that the first electrical conductivity EC ₁ ≦ the lower limit threshold EC _b2 (YES), the concentration of the circulating water W2 is sufficiently reduced. Since it is considered, the process proceeds to step ST106. In step ST105, if the blow-down process control unit 200 determines that the first electric conductivity EC ₁ > the lower limit threshold EC _b2 (NO), the concentration of the circulating water W2 is still decreasing. Therefore, the process returns to step ST104.

  In step ST106 (step ST105: YES), the blow-down process control unit 200 closes the makeup water valve 136 and ends the blow-down process. Thereby, the process of this flowchart is complete | finished (it returns to step ST101).

  Next, the chemical injection process (flow rate proportional chemical injection) will be described. FIG. 7 is a flowchart showing a processing procedure when a medicine injection process is executed in the medicine supply device 300. The process of the flowchart shown in FIG. 7 is executed by the medicine injection control unit 311 based on the control program stored in the memory 320. Further, the process of the flowchart shown in FIG. 7 is repeatedly executed during the operation of the cooling system 1.

  In step ST201 shown in FIG. 7, the medicinal injection control unit 311 determines whether or not a predetermined number of pulse signals have been received from the flow sensor 135 (whether or not the counted pulse signals have reached a predetermined number). In this step ST201, when it determines with the chemical injection control part 311 having received the predetermined number of pulse signals (YES), a process transfers to step ST202. Moreover, in step ST201, when it determines with the chemical injection control part 311 not receiving the predetermined number of pulse signals (NO), a process returns to step ST201.

  In addition, when the blow-down process is executed while the pulse signal output from the flow sensor 135 has not reached the predetermined number, the medicine injection control unit 311 stores the count number up to that time in the memory 210. Then, in the chemical injection process after the blow-down process, the amount of the medicine that is proportional to the number of pulse signals (the amount of replenishment water) is added to the amount of injection calculated in step ST207 (described later) (the flowchart shown in FIG. 7). Is omitted).

  In step ST202 (step ST201: YES), the medicine injection control unit 311 determines whether or not the blow-down process has been started (executed). The medicinal injection control unit 311 can determine whether the blow-down process has been started based on the presence or absence of an external stop signal output from the blow-down process control unit 200.

  In this step ST202, when it determines with the chemical injection control part 311 having started the blowdown process (YES), a process transfers to step ST204. In this case, execution of the medicine injection process is in a standby state. Moreover, in step ST202, when it determines with the chemical injection control part 311 not having started the blowdown process (NO), a process transfers to step ST203.

  In step ST203 (step ST202: NO), the medicinal injection control unit 311 calculates the dose of the drug based on the pulse signal acquired in step ST201, and the pump drive signal having a pulse width corresponding to the dose is set as the drug. Output to the supply pump 350. Thereby, the medicine injection process is executed in the medicine supply pump 350. When the medicine injection process in step ST203 ends, the process of this flowchart ends (returns to step ST201).

  In addition, when the blow-down process is started while the medicine injection process is being performed in step ST203, the process proceeds to step ST204 described later. In that case, the medicine injection process performed in step ST203 is cancelled.

  On the other hand, in step ST204 (step ST202: YES), the medicine injection control unit 311 counts the number P of pulse signals output from the flow sensor 135 (starts counting P).

  In step ST205, the medicine injection control unit 311 determines whether or not the blow-down process has been completed. In step ST205, when the chemical injection control unit 311 determines that the blow-down process has ended (YES), the process proceeds to step ST206. In step ST205, when the chemical injection control unit 311 determines that the blow-down process has not ended (NO), the process returns to step ST205.

  In step ST206 (step ST205: YES), the medicine injection control unit 311 stores the counted pulse signal number P in the memory 320 and resets the count value of the pulse signal number P.

  In step ST207, the medicinal injection control unit 311 reads the counted number of pulse signals P from the memory 320, calculates the amount of the drug to be injected in proportion to the number of pulse signals P, and has a pulse width corresponding to the amount of input. A pump drive signal is output to the medicine supply pump 350. Thereby, the medicine injection process is executed in the medicine supply pump 350.

  In step ST208, the chemical injection control unit 311 determines whether or not the chemical injection processing has ended. In this step ST208, when it is determined by the chemical injection control unit 311 that the chemical injection process has been completed (YES), the processing of this flowchart ends (returns to step ST201). Moreover, in step ST208, when it determines with the chemical injection process not being complete | finished (NO), a process transfers to step ST209.

  In step ST209 (step ST208: NO), the medicine injection control unit 311 determines whether or not the blow-down process has been started (executed). The medicinal injection control unit 311 can determine whether the blow-down process has been started based on the presence or absence of an external stop signal output from the blow-down process control unit 200.

  In this step ST209, when it determines with the chemical injection control part 311 having started the blowdown process (YES), a process transfers to step ST210. In step ST209, when the chemical injection control unit 311 determines that the blow-down process has not been started (NO), the process returns to step ST208.

  In step ST210 (step ST209: YES), the medicine injection control unit 311 stops the output of the pump drive signal to the medicine supply pump 350 and interrupts the medicine injection process. In addition, the medicinal injection control unit 311 stores in the memory 320 the amount of medicine that has not been supplied to the circulating water W2 in the interrupted medicating process.

  In step ST211, the medicine injection control unit 311 counts the number P of pulse signals output from the flow sensor 135 (starts counting P).

  In step ST212, the chemical injection control unit 311 determines whether or not the blow-down process has ended. In this step ST212, when the chemical injection control unit 311 determines that the blow-down process has ended (YES), the process proceeds to step ST213. In step ST212, when the chemical injection control unit 311 determines that the blow-down process has not ended (NO), the process returns to step ST212.

  In step ST213 (step ST212: YES), the medicine injection control unit 311 stores the counted number of pulse signals P in the memory 320 and resets the count value of the number of pulse signals P.

  In step ST214, the medicinal injection control unit 311 reads from the memory 320 the amount of the medicine that has not been supplied to the circulating water W2 in the interrupted medicinal injection process. In addition, the medicine injection control unit 311 reads the counted number of pulse signals P from the memory 320, and calculates the amount of medicine input proportional to the number of pulse signals P. And the chemical injection control part 311 is the chemical | drug | medicine proportional to the input amount of the chemical | medical agent which was not supplied to circulating water W2 in the interrupted chemical injection process, and the pulse signal number P detected during the execution period of blowdown processing. A pump drive signal having a pulse width corresponding to the total amount of the drug is output to the drug supply pump 350 so that the total amount of the drug W3 is supplied to the circulating water W2. Thereby, the medicine injection process is executed (restarted) in the medicine supply pump 350. When the medicine injection process in step ST214 is completed, the process of this flowchart ends (returns to step ST201).

  Next, the auxiliary drug injection process will be described. FIG. 8 and FIG. 9 are flowcharts showing a processing procedure in the case where the auxiliary drug injection process is executed in the medicine supply device 300. The processing of the flowcharts shown in FIGS. 8 and 9 is executed by the medicine injection control unit 311 and the time measuring unit 312 based on the control program stored in the memory 320. 8 and 9 are repeatedly executed during the operation of the cooling system 1.

  In step ST301 shown in FIG. 8, the chemical injection control unit 311 determines whether there is an output of a pump operation signal to the circulating water pump 132 (whether the cooling tower 120 is in operation). In step ST301, when the chemical injection control unit 311 determines that there is an output of a pump operation signal to the circulating water pump 132 (YES), the process proceeds to step ST302. Moreover, in step ST301, when the chemical injection control unit 311 determines that there is no pump operation signal output to the circulating water pump 132 (NO), the process returns to step ST301.

  In step ST302, the medicine injection control unit 311 determines whether or not there is no pulse signal output from the flow sensor 135. In this step ST302, when the chemical injection control unit 311 determines that there is no pulse signal output from the flow sensor 135 (YES), the process proceeds to step ST303. In step ST302, when the chemical injection control unit 311 determines that there is a pulse signal output from the flow sensor 135 (NO), the process returns to step ST302.

Step ST 303: (Step ST 302 YES), time counting unit 312 starts counting the residence time _{T T.} The residence time T _T is the period of the pulse signal from the flow rate sensor 135 is not outputted.

In step ST 303, dosing control unit 311, the residence time _{T T,} which is kept by time keeping unit 312 determines whether or not exceeded the allowable residence time _{T W.} Incidentally, dosing control unit 311 obtains the allowable residence time _{T W} from the memory 320. In this step ST304, when the chemical injection control unit 311 determines that the residence time T _T > the allowable residence time T _W (YES), the process proceeds to step ST307. Further, in step ST 304, the dosing control unit 311, when it is determined that the residence time _{T T} ≦ allowable residence time _{T W} (NO), the process proceeds to step ST 305.

  In step ST305 (step ST304: NO), the medicine injection control unit 311 determines whether or not there is a pulse signal output from the flow sensor 135. In this step ST305, when it determines with the chemical injection control part 311 having the output of the pulse signal from the flow sensor 135 (YES), a process transfers to step ST306. In step ST305, when the chemical injection control unit 311 determines that there is no pulse signal output from the flow sensor 135 (NO), the process returns to step ST304.

Step ST 306: (Step ST 305 YES), dosing control unit 311 resets the counting of the retention time _{T T} by timing unit 312. Thereby, the process of this flowchart is complete | finished (it returns to step ST301). In the case the residence time T _T there is an output of the pulse signals from the flow sensor 135 before reaching the allowable residence time T _W (i.e., when there is a supply of makeup water W1), does not execute an auxiliary chemical feed processing Because.

  On the other hand, in step ST307 (step ST304: YES), the medicine injection control unit 311 outputs a pump drive signal to the medicine supply pump 350 so that a preset amount of medicine W3 is supplied to the circulating water W2. Then, the auxiliary drug injection process is executed.

  Next, in step ST308 shown in FIG. 9, the medicine injection control unit 311 determines whether or not the blow-down process has been started (executed). In this step ST308, when it determines with the chemical injection control part 311 having started the blowdown process (YES), a process transfers to step ST309. Moreover, in step ST308, when the chemical injection control part 311 determines with the blowdown process not being started (NO), a process transfers to step ST314.

  In step ST309 (step ST308: YES), the medicine injection control unit 311 stops the output of the pump drive signal to the medicine supply pump 350 and forcibly ends the auxiliary medicine injection processing. Thereby, the process of this flowchart is complete | finished (it transfers to step ST306).

  On the other hand, in step ST310 (step ST308: NO), the chemical injection control unit 311 determines whether or not the auxiliary chemical injection processing has ended. In this step ST310, when it is determined by the chemical injection control unit 311 that the auxiliary chemical injection processing has been completed (YES), the processing of this flowchart ends (the process proceeds to step ST306). Thus, if the blow-down process is not executed during the execution period of the auxiliary drug injection process, the process of the present flowchart ends without ending the auxiliary drug injection process halfway.

  In step ST310, when the chemical injection control unit 311 determines that the auxiliary chemical injection processing has not ended (NO), the process returns to step ST308.

  According to the medicine supply device 300 of the present embodiment described above, for example, the following effects can be obtained.

  The medicine supply device 300 waits (stops) the execution of the chemical injection process during the blow-down process, and executes the chemical injection process when the next blow-down process is executed during the execution of the chemical injection process. Suspend (stop). Therefore, it is avoided that the blow-down process and the chemical injection process are performed at the same time, and the medicine supplied during the execution of the next blow-down process is immediately discharged out of the system together with a part of the circulating water W2. There is nothing to do. Therefore, according to the medicine supply device 300, it is possible to suppress the wasteful consumption of the medicine by the next blow-down process started during the execution of the stopped medicine injection process.

  Further, when the medicine supply process is interrupted by the blow-down process, the medicine supply device 300 restarts the medicine injection process after the blow-down process is finished, and the medicine is not supplied by the interrupted medicine injection process. Is added to the circulating water W2 in an amount that is the sum of the amount of charged and the amount of chemical that is proportional to the amount of makeup water during the blow-down process. Therefore, according to the medicine supply device 300, even when the next blow-down process is executed during the execution of the stopped chemical injection process, the necessary amount of the medicine W3 is quickly circulated after the blow-down process is completed. Can be supplied to W2.

When the cooling tower 120 is in operation and the residence time T _T during which the makeup water W1 is not supplied to the cooling tower 120 exceeds the allowable residence time T _W , the medicine supply device 300 operates in the medicine supply pump 350. The supplementary medicine injection process is executed. Therefore, the medicine supply device 300 can effectively maintain the medicinal effect in the circulating water system when the load on the apparatus to be cooled 131 is low.

  In addition, the medicine supply device 300 supplies the bactericide from the medicine supply device 300 to the circulating water W2 in the auxiliary medicine injection process. In general, when the replenishment water W1 is not supplied to the cooling tower 120 for a long time during the operation of the cooling tower 120, the consumption of the scale inhibitor and the anticorrosive agent is small, but the consumption of the bactericide increases due to the growth of fungi. However, in the medicine supply device 300, when the replenishment water W1 is not supplied to the cooling tower 120 for a long time during the operation of the cooling tower 120, the sterilizing agent is supplied to the circulating water W2 in the auxiliary medicine injection process. Therefore, slime failure in the circulating water system can be effectively suppressed.

  Moreover, the chemical | medical agent supply apparatus 300 adjusts the required quantity of a chemical | medical agent following the change of the concentration rate of the circulating water W2. Therefore, even if the electrical conductivity of the makeup water W1 and the circulating water W2 fluctuates during the operation of the cooling tower 120, the chemical supply device maintains the chemical concentration in the circulating water W2 at an appropriate chemical maintenance concentration. Wasteful consumption can be suppressed.

  As mentioned above, although preferred embodiment of this invention was described, this invention is not limited to embodiment mentioned above, It can implement with a various form as follows.

  In this embodiment, the cooling tower 120 which has the circulating water line L110 was demonstrated to the example as industrial equipment which has a circulating water system. Not only this example but industrial equipment which has a circulating water system may be a boiler device and a reverse osmosis membrane device, for example.

  In the case of a boiler device, for example, in a multi-tube type once-through boiler, the steam-water mixture generated in the boiler body is separated into steam and saturated water by a steam-water separator connected to the upper header, and the saturated water is separated into a precipitation pipe ( It is configured to return to the lower header by a circulating water system. Therefore, in this type of boiler apparatus, the process of discharging a part of the water flowing through the circulating water system and introducing the makeup water supplied from the outside into the boiler body can be regarded as a blow-down process.

  In the case of a reverse osmosis membrane device, in order to secure the flow velocity on the primary membrane surface, in general, a part of the concentrated water discharged outside the membrane module is passed through a concentrated water return line (circulating water system). A cross-flow system is used to return to the raw water suction side of the pressure pump. Therefore, in the cross-flow type reverse osmosis membrane device, a process of discharging a part of the concentrated water flowing through the circulating water system and introducing the raw water supplied from the outside into the reverse osmosis membrane device is regarded as a blow-down process. I can do it.

  In this embodiment, the example which supplies a chemical | medical agent to the storage part 122 was demonstrated. However, the position for supplying the drug is not limited to this example as long as the drug can be supplied to the circulating water system (the tower main body 121 and the circulating water line L110). For example, the chemical may be supplied to a watering part (not shown) of the tower main body 121, or may be supplied to the circulating water supply line L111 or the circulating water recovery line L112. Further, the medicine may be supplied to the makeup water W1, or may be supplied to both the makeup water W1 and the circulating water W2.

In this embodiment, the example which arrange | positions the 1st EC sensor 133 in the storage part 122 was demonstrated. Not limited to this, the first EC sensor 133 may be disposed in the circulating water recovery line L112. In the present embodiment, the example in which the blow-down process is executed when the first electrical conductivity EC ₁ detected by the first EC sensor 133 is equal to or higher than the upper limit threshold EC _b1 has been described. In addition, the evaporative loss amount of the cooling tower 120 may be detected, and the concentration of the circulating water W2 may be estimated based on the detected evaporative loss amount to determine whether or not the blowdown process can be performed.

  In the present embodiment, as the blow-down process, an example (forcible replenishment) in which part of the circulating water W2 is discharged out of the system from the cooling tower 120 by forcibly supplying the makeup water W1 to the cooling tower 120 has been described. . As another blow-down process, for example, a drain valve is provided in the drain line L130, and the drain valve is opened to forcibly discharge the circulating water W2 from the cooling tower 120 to the outside of the system, thereby supplying the makeup water W1 to the cooling tower. 120 may be supplied (forced drainage). In this case, the upstream end of the drain line L130 is connected to the bottom of the reservoir 122 (see FIG. 1).

  Moreover, you may discharge | release a part of circulating water W2 out of the system from the circulating water line L110 as a blowdown process. Moreover, you may discharge | emit a part of circulating water W2 out of the system from both the cooling tower 120 and the circulating water line L110 as a blowdown process.

  In the present embodiment, an example in which an electromagnetically driven diaphragm type metering pump is used as the medicine supply pump 350 of the medicine supply apparatus 300 has been described. Not limited to this example, a fixed amount discharge pump such as a plunger pump or a bellows pump may be used as the medicine supply pump 350.

  In the present embodiment, an example in which the cooling tower 120 is configured as an open cooling tower has been described. Not limited to this example, the cooling tower 120 may be configured as a hermetic cooling tower.

  The present invention can be implemented in various other forms without departing from the spirit or main features thereof. Therefore, the above-described embodiments or examples are merely examples in all respects and should not be interpreted in a limited manner. The scope of the present invention is indicated by the scope of claims, and is not restricted by the text of the specification. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Cooling system 100 System control unit 120 Cooling tower 122 Storage part 133 1st EC sensor (1st electric conductivity sensor)
135 Flow rate sensor (flow rate detection means)
136 Supply water valve 137 Water tap 138 Overflow port 139 Second EC sensor (second electrical conductivity sensor)
201 Blowdown processing control unit 210 Memory 300 Drug supply device 310 Drug injection control unit 311 Drug injection control unit (drug supply control unit)
312 Timekeeping unit 320 Memory (storage unit)
330 Drug tank (Drug supply means)
350 Drug supply pump (drug supply means)
L110 Circulating water line L120 Supplementary water line L130 Drainage line L140 Chemical supply line W1 Supplementary water W2 Circulating water W3 Chemical

Claims (5)

A flow rate detecting means for detecting the amount of makeup water supplied to the circulating water system through which the circulating water circulates and outputting as a detected water amount value;
A medicine supply means capable of executing a medicine supply process for supplying a medicine to the circulating water system;
A medicine supply control unit that causes the medicine supply means to execute the medicine supply process so that an input amount of medicine proportional to the detected water amount value output from the flow rate detection means is supplied to the circulating water system;
A storage unit that stores an amount of medicine that has not been supplied from the medicine supply means to the circulating water system in the medicine supply process;
The drug supply control unit (i) supplies the make-up water to the circulating water system while the blow-down process for discharging a part of the circulating water flowing through the circulating water system to the outside is performed. Waiting for the execution of the supply process, and after completion of the blow-down process, the amount of medicine proportional to the detected water amount value detected during the execution period of the blow-down process is supplied to the circulating water system. (Ii) When the next blow-down process is executed during the execution of the medicine supply process, the medicine supply process is interrupted and the medicine supply process is interrupted. The amount of the medicine that has not been supplied to the circulating water system in the processing is stored in the storage unit, and the amount of the medicine that is stored in the storage unit after the completion of the next blow-down process, In the medicine supply means, the medicine supply means supplies the medicine in an amount that is the sum of the amount of medicine input proportional to the detected water amount detected during the next blow-down process. To execute the process,
Drug supply device. The medicine supply control unit calculates the dosage of medicine based on the formula (1).
The drug supply device according to claim 1.
W = V × C ÷ N ÷ D (1)
W: amount of drug input V: detected water amount value of makeup water C: maintenance concentration of drug in circulating water N: concentration rate of circulating water D: density of drug The circulating water system is
The circulating water including the supplied makeup water is cooled, and connected to a cooling tower that supplies the cooled circulating water to the apparatus to be cooled.
First electrical conductivity detection means for detecting the electrical conductivity of the circulating water and outputting it as a first detected electrical conductivity value;
Second electrical conductivity detection means for detecting the electrical conductivity of the makeup water and outputting as a second detected electrical conductivity value;
The medicine supply control unit obtains the first detected electric conductivity output from the first electric conductivity detecting means and the second detected electric conductivity output from the second electric conductivity detecting means, and circulates the medicine supply control section. Calculating the concentration ratio of water based on equation (2),
The drug supply device according to claim 2.
N = E1 ÷ E2 (2)
E1: First detected electric conductivity value E2: Second detected electric conductivity value The medicine supply control unit may supply makeup water to the medicine supply means when circulating water circulates in the circulating water system and a period in which makeup water is not supplied to the circulating water system exceeds a preset allowable period. Regardless of the amount of water, the medicine supply process of a preset input amount is executed.
The medicine supply device according to any one of claims 1 to 3. The drug supply means supplies a bactericide as a drug supplied to the circulating water system in the drug supply process.
The medicine supply device according to claim 4.

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