JP7345402B2 - cooling system - Google Patents

Description

The present invention relates to a cooling system that utilizes a cooling tower.

A cooling system that uses a cooling tower generally consists of a cooling tower that cools the incoming water by partially evaporating the water by exchanging heat with the outside air, and a cooling tower that cools the water by partially evaporating it by exchanging heat between the incoming water and the outside air. It includes a heat exchange section that cools the object to be cooled by exchanging heat with the cooling tower, and a circulation flow path (circulation water flow path) that circulates water between the cooling tower and the heat exchange section. The cooling system is applied to cooling a wide variety of devices, from relatively large devices such as compressors, pumps, and generators to relatively small electronic devices used in computers and the like.

In such a cooling system, the temperature of circulating water for cooling an object to be cooled is uniquely determined depending on the design and performance of one system of cooling towers. Therefore, when cooling a plurality of objects to be cooled with different temperatures of circulating water, a multi-system cooling tower facility using a plurality of cooling towers is used. For example, Patent Document 1 describes a cooling system that includes two cooling towers and cools objects to be cooled to different temperatures.

On the other hand, in such a cooling system, circulating water is concentrated by evaporation of water in the cooling tower. That is, only the water in the circulating water evaporates, and the concentration of components other than water increases. As the concentration progresses, scale (silica, calcium, etc.) may be deposited on the piping of the circulation flow path of the circulating water, the heat exchanger tubes of the heat exchange section, and the like. Therefore, in a cooling system using a cooling tower, the circulating water is normally discharged (blowdown) as appropriate to prevent the circulating water from becoming too concentrated, and fresh, unconcentrated make-up water is supplied. In addition, by installing equipment for injecting scale-preventing chemicals into the cooling tower equipment and injecting the chemicals into the circulation channels and circulating them, it is possible to eliminate scale in the piping of the circulating water circulation channels and heat exchanger tubes in the heat exchange section. A method of suppressing precipitation is also known (see, for example, Patent Document 2).

Japanese Patent Application Publication No. 2010-25408 Japanese Patent Application Publication No. 2008-249300

The temperature of the circulating water used to cool the object to be cooled is usually determined depending on various factors such as the size of the object to be cooled, its purpose of use, and its function, and more specifically, depending on the type of object to be cooled. temperatures often vary. Therefore, when cooling these objects to be cooled at the same time, it is necessary to use a multi-system cooling tower facility in which a number of cooling towers corresponding to the desired temperature of the circulating water is used for the reasons described above.

The present inventors have discovered that when using a cooling system that requires the use of multiple systems of cooling tower equipment in which the temperature of the circulating water for cooling the object to be cooled differs, scale precipitation occurs in the circulating water circulation path, etc. We focused on the issue of how to effectively suppress this.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a cooling system that can efficiently supply a scale preventive agent to cooling tower equipment of different systems having different temperatures of circulating water for cooling objects to be cooled.

A cooling system according to one aspect of the present invention includes a first system cooling tower facility for cooling a first object to be cooled to a first temperature, and a cooling tower facility for cooling a second object to be cooled to a second temperature different from the first temperature. a second system cooling tower facility for cooling to a temperature of , a first circulation pump that causes the circulating water to flow into a first heat exchange section; and a first cooling target that causes heat exchange between the circulating water that has flowed in by the first circulation pump and the first cooling object; the first heat exchange section that cools the object to be cooled; a first cooling tower that cools the circulating water whose temperature has increased due to heat exchange in the first heat exchange section; and the first circulating flow. a first make-up water supply section that replenishes water to the channel; a first discharge channel that discharges a portion of the circulating water; and a chemical injection section that injects a scale-preventing chemical into the first circulating channel. , the second system cooling tower equipment includes a second circulation flow path through which circulating water circulates, and is disposed in the second circulation flow path and causes the circulating water to flow into a second heat exchange section. a second circulation pump, and the second heat exchange unit that exchanges heat between the circulating water introduced by the second circulation pump and the second object to be cooled to cool the second object to be cooled; , a second cooling tower that cools the circulating water whose temperature has increased due to heat exchange in the second heat exchange section; and a second make-up water supply section that supplies water to the second circulation flow path. , a second discharge flow path for discharging a portion of the circulating water, and a circulating water bypass flow path for receiving the supply of a scale prevention agent to the second circulation flow path, the circulating water bypass flow The channel is configured to allow a portion of the circulating water in the first discharge channel and/or the first circulation channel containing the anti-scaling agent to be supplied to the second circulation channel; The first discharge flow path and/or the first circulation flow path and the second circulation flow path are connected.

According to this cooling system, even if the second system cooling tower equipment is not equipped with a chemical injection part, a portion of the circulating water in the first discharge flow path and/or the first circulation flow path containing the scale prevention agent is supplied to the second circulating flow path via the circulating water bypass flow path. In other words, by providing the circulating water bypass channel, the scale prevention agent can be efficiently supplied to both the first system cooling tower equipment and the second system cooling tower equipment.

Furthermore, it is preferable that the flow rate in the first circulation flow path is higher than the flow rate in the second circulation flow path.

According to this configuration, circulation flows from the first circulation flow path in the first system cooling tower equipment where the flow rate of the circulation flow path is higher to the second circulation flow path of the second system cooling tower equipment where the flow rate of the circulation flow path is lower. Since a portion of the water is supplied, an appropriate amount of the anti-scaling agent can be supplied to the second circulation channel without significantly affecting the amount and temperature of the circulating water in both circulation channels.

Furthermore, the circulating water bypass flow path may be branched from the first discharge flow path and connected to the second circulation flow path.

According to this configuration, the circulating water discharged (blown down) from the first discharge passage of the first system cooling tower equipment is supplied to the second circulation passage of the second system cooling tower equipment to prevent scaling. It can be reused as a medicine.

Furthermore, in the above configuration, the first discharge flow path is located in a portion of the first circulation flow path between the discharge port side of the first circulation pump and the inlet side of the first heat exchange section. It is preferable if it is provided.

According to this configuration, a part of the circulating water can be supplied to the second circulation channel of the second system cooling tower equipment by using the discharge performance of the first circulation pump of the first system cooling tower equipment. Therefore, circulating water containing anti-scaling agents can be efficiently supplied.

Furthermore, the circulating water bypass flow path connects the second circulation flow path via the circulating water bypass flow path so that the amount of the scale prevention agent supplied per unit time falls within a preset range. The apparatus may further include a flow rate adjustment section that adjusts the amount of the circulating water supplied from the first circulation flow path.

According to this configuration, the scale prevention agent in the circulating water of the second system cooling tower equipment can be supplied in a more accurate and appropriate amount.

As described above, according to the present invention, it is possible to provide a cooling system that can efficiently supply a scale prevention agent to cooling tower equipment of different systems in which the temperature of circulating water for cooling objects to be cooled is different. becomes.

1 is a diagram schematically showing the configuration of a cooling system according to Embodiment 1 of the present invention. 2 is a diagram schematically showing the configuration of a first heat exchange section of the first system cooling tower equipment shown in FIG. 1. FIG. FIG. 2 is a diagram schematically showing the configuration of a cooling system according to Embodiment 2 of the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A waste treatment facility according to an embodiment of the present invention will be described in detail below based on the drawings.

(Embodiment 1)
The configuration of a cooling system 1 according to Embodiment 1 of the present invention will be described with reference to FIG. 1.

Note that although FIG. 1 shows only the main components of the cooling system 1 according to the first embodiment, the cooling system 1 may further include other components that are not shown in the figure. Each component of the cooling system 1 will be described in detail below.

The cooling system 1 according to the first embodiment is a system that uses water as a refrigerant and uses two systems of cooling tower equipment to cool an object to be cooled in a heat exchange section.

As shown in FIG. 1, the cooling system 1 includes a first system cooling tower facility 10 and a second system cooling tower facility 20.

The first system cooling tower equipment 10 is equipment that cools a first object to be cooled, which will be described later, to a preset first temperature. The second system cooling tower equipment 20 is equipment that cools a second object to be cooled, which will be described later, to a second temperature different from a preset first temperature.

The first system cooling tower equipment 10 includes a first circulation channel 11, a first circulation pump 12, a first heat exchange section 13, a first cooling tower 14, and a first make-up water supply pump. 311 and a first make-up water supply channel 312 (first make-up water supply section), a first discharge channel 15, and drug injection pump equipment 16 (medicine injection section).

First, these detailed functions in the first system cooling tower equipment 10 will be explained.

The first circulation channel 11 is a path through which circulating water (also referred to as cooling water), which is a refrigerant for cooling an object to be cooled, circulates, and is, for example, a pipe. In the first embodiment, in the first circulation flow path 11, the first circulation pump 12, the first heat exchange section 13, and the first cooling tower 14 are arranged in between in this order along the flow of circulating water. It is located. Note that the flow rate of the circulating water flowing through the first circulation channel 11 is a flow rate required for cooling a first cooling target 132, which will be described later.

The first circulation pump 12 is a pump that causes circulating water flowing through the first circulation channel 11 to flow into a first heat exchange section 13, which will be described later. The discharge performance of the first circulation pump 12 may be selected to match the flow rate in the first circulation flow path 11.

As will be described in detail later, a portion of the circulating water discharged from the first circulation pump 12 passes through the first discharge channel 15 to the outside of the first system cooling tower equipment 10 (also simply referred to as outside the system). Another part is supplied to the second circulation passage 21 of the second system cooling tower equipment 20 via the circulation water bypass passage 26 .

The first heat exchange unit 13 exchanges heat between the circulating water introduced by the first circulation pump 12 and the first object to be cooled, thereby cooling the first object to be cooled.

FIG. 2 is a diagram schematically showing the configuration of the first heat exchange section 13 of the first system cooling tower equipment 10 shown in FIG. As shown in FIG. 2, the first heat exchange section 13 includes a plurality of first heat exchangers 131 arranged in parallel with each other, and is arranged in contact with each of the plurality of first heat exchangers 131. A first cooling target 132 is provided, and a circulating water branch flow path 133 that passes through the plurality of first heat exchangers 131 is provided. The circulating water that has flowed into the first heat exchange section 13 in the first circulation channel 11 by the first circulation pump 12 is transferred to a plurality of circulating water branch channels 133 in the first heat exchanger 131. Branch out.

By branching and passing the circulating water (cooling water), the heat of the first cooling objects 132 placed in contact with each other is absorbed, and each first cooling object 132 has a preset first temperature. is cooled to The preset first temperature is a preset temperature that does not affect the functions or the like of the first cooling target 132 when it is actually used, or is determined to be appropriate. Basically, the temperature of the circulating water flowing through the first circulating flow path 11 is determined in accordance with the first temperature. Thereafter, when flowing out of the first heat exchange section 13, the plurality of circulating water branch channels 133 join together. Since the circulating water flowing out from the first heat exchange section 13 has absorbed the heat of the first cooling target 132, the temperature of the circulating water has increased.

The first cooling target 132 is a device in which the temperature of circulating water required to cool the device is relatively high. Examples of such devices include air compressors, hydraulic devices, and the like. The first cooling target 132 is, for example, a device in which the temperature of the circulating water on the outlet side of the first cooling tower 14 is about 32 to 35°C.

In the first cooling tower 14, the circulating water whose temperature has increased due to heat exchange in the first heat exchange section 13 is cooled, and the circulating water is cooled down again and is transferred to the piping of the first circulation channel 11, etc. Return to the route. Specifically, the first cooling tower 14 includes a filling material 141 provided between the top and bottom inside the tower, a fan 142 provided at the top of the tower, a water sprinkler 143 provided at the top of the tower, A lower water tank 144 provided at the bottom of the tower is provided.

The circulating water that has flowed in from the first heat exchange section 13 first flows to the water sprinkler 143 via a path such as piping. When the outside air taken in by the operation of the fan 142 comes into contact with the circulating water flowing from above to below the filler 141, heat is removed when a part of the water evaporates, thereby cooling the circulating water. be done. Note that among the components constituting the circulating water, the only component that evaporates is water, and the scale components and the scale-preventing agent described below are components that do not evaporate, so the content of the scale-preventing agent in the circulating water does not change. The amount of evaporation of the circulating water at this time varies depending on the amount of heat exchanged by the first cooling tower 14, that is, to what degree the temperature of the water in the first circulation channel 11 is lowered. For example, the amount of evaporation is about 0.1 to 5%, particularly about 0.5 to 1%, of the flow rate of water in the first circulation channel 11. Thereafter, the cooled circulating water is collected into the lower water tank 144.

Makeup water is also supplied to the lower water tank 144. The make-up water is approximately the amount of water in the circulating water evaporated in the first cooling tower 14 (for example, in m ³ /h) and the amount of circulating water discharged outside the system from the first discharge channel 15, which will be described later. The amount of water (for example, m ³ /h as a unit) and the amount of part of the circulating water supplied to the second circulation flow path 21 via the circulating water bypass flow path 26 (described later) (for example, m ^{3 /} h) /h) is added to the first circulation flow path 11. The make-up water is supplied by the first make-up water supply pump 311 from the make-up water tank 30 via the first make-up water supply channel 312 . The temperature of the make-up water is preferably the same or lower than that of the circulating water, but since the amount of evaporation of the circulating water and the amount of discharged to the outside of the system are usually small compared to the flow rate in the circulation flow path, the temperature is the same or lower than that of the circulating water. It doesn't have to be temperature. In this way, the cooled circulating water and make-up water will eventually be stored in the lower water tank 144. Thereafter, the circulating water flows out from the outlet side of the first cooling tower 14 at the original flow rate in the first circulation channel 11 .

The drug injection pump equipment 16 is equipment for injecting a scale prevention chemical into the first circulation channel 11 . Specifically, the drug injection pump equipment 16 is configured to inject a drug between the outlet side of the first cooling tower 14 and the suction port side of the first circulation pump 12 in the first circulation channel 11. It is located in By arranging the drug injection pump equipment 16 in such a position, after makeup water is supplied to the first circulation channel 11, a portion of the circulating water is discharged from the first discharge channel 15, which will be described later. The drug can be injected before the injection. That is, since the drug can be injected into a location where a large amount of flow is stably flowing in the first circulation channel 11, the drug can be injected while being homogeneously mixed. Furthermore, it is possible to avoid part of the circulating water from being discharged from the first discharge channel 15 immediately after the medicine is injected, thereby reducing the amount of the injected medicine that is discharged and wasted. I can do it.

The amount of anti-scaling agent to be injected is the amount of anti-scaling agent required in the first circulation channel 11 . For example, roughly speaking, when the cooling system 1 is started up, an amount based on the circulating water in the first circulating flow path 11 (for example, in g/m ³ ) is injected as the initial injection amount. After the operation of the cooling system 1 has stabilized, for example, approximately a preset injection amount of anti-scaling agent per amount of makeup water replenished in the first circulation channel 11 (for example in g/m ³ ), Alternatively, a preset injection amount (for example, in g/h) of the scale preventing agent per unit time in the first circulation channel 11 is injected. Specifically, for example, the amount of the scale prevention agent contained in a portion of the circulating water discharged out of the system per unit time from the first discharge channel 15 (described later) (for example, in g/h), Furthermore, if necessary, the amount of the scale preventive agent that is the same as the amount of the scale preventive agent scattered by the fan 142 of the first cooling tower 14 (for example, in g/h) may be injected again. .

Further, a concentration sensor for detecting the concentration (for example, g/m ³ as a unit) of the scale prevention agent contained in the circulating water flowing through the first circulation flow path 11 is further provided, and the concentration sensor is configured to detect the concentration of the scale preventive agent contained in the circulating water flowing through the first circulation channel 11. The required amount of antiscaling agent (for example in g/h) may be injected. Furthermore, a concentration sensor for detecting the concentration of such a scale prevention agent may be provided at any location in the first circulation channel 11. Alternatively, as an alternative to the concentration sensor described above, the circulating water flowing through any suitable point in the first circulating flow path 11 is intermittently sampled to determine the concentration of the scale preventive agent (for example, in g/m ³ ). May be measured. Note that the specific injection amount of the scale prevention agent varies depending on the type of scale prevention agent.

The first discharge flow path 15 is a path for discharging (blowdown) a part of the circulating water to the effluent water tank treatment equipment 40 outside the system. Specifically, the first discharge flow path 15 is connected to a location between the discharge port side of the first circulation pump 12 and the inlet side of the first heat exchange section 13 in the first circulation flow path 11. It is provided. As mentioned above, blowdown is performed to suppress scale precipitation due to concentration of circulating water. For example, the blowdown amount is about 0.2% to 1%, particularly about 0.2 to 0.5%, relative to the flow rate in the first circulation channel 11.

Here, in the first cooling tower 14, {(amount of evaporation of circulating water)+(amount of circulating water discharged from the first discharge channel 15)}/(amount of circulating water discharged from the first discharge channel 15) The amount of circulating water), that is, the concentration ratio of the circulating water is about 3 to 8 times, preferably about 5 times. By operating the cooling system 1 at such a magnification, it is possible to maintain a favorable balance between suppression of scale precipitation and cost burden due to discharge of the scale prevention agent during blowdown.

Next, the second system cooling tower equipment 20 will be explained.

The second system cooling tower equipment 20 includes a second circulation flow path 21, a second circulation pump 22, a second heat exchange section 23, a second cooling tower 24, and a second make-up water supply pump. 321 and a second makeup water supply channel 322 (second makeup water supply section), a second discharge channel 25, and a circulating water bypass channel 26.

The second cooling tower 24 and the second discharge passage 25 of the second system cooling tower equipment 20 are common with the first cooling tower 14 and the first discharge passage 15 of the first system cooling tower equipment 10, respectively. Since it has the same function and configuration, the explanation will be omitted.

Hereinafter, regarding other configurations of the second system cooling tower equipment 20, the points that differ from the configuration in the first system cooling tower equipment 10 will be mainly explained.

The second circulation flow path 21 basically has the same function and configuration as the first circulation flow path 11. The difference from the first circulation flow path 11 is that the flow rate in the second circulation flow path 21 is lower than the flow rate in the first circulation flow path 11.

The second circulation pump 22 basically has the same function and configuration as the first circulation pump 12. The difference from the first circulation pump 12 is that the discharge capacity of the second circulation pump 22 is smaller than that of the first circulation pump 12. This is because, as described above, the flow rate in the second circulation flow path 21 is smaller than the flow rate in the first circulation flow path 11.

The second heat exchange section 23 basically has the same function and configuration as the first heat exchange section 13. The difference from the first heat exchange section 13 is that the second cooling target is a device in which the temperature of the circulating water required to cool the device is relatively low. Examples of such equipment include vacuum pumps for extraction. The second object to be cooled is, for example, a device in which the temperature of the circulating water on the outlet side of the second cooling tower 24 is about 19 to 30°C. Furthermore, the number of second objects to be cooled within the second heat exchange section 23 is significantly smaller than the number of first objects to be cooled 132 within the first heat exchange section 13 (for example, two or three objects). ) (not shown), the flow rate of circulating water is also small.

Thus, in the first embodiment, the second cooling target requires a lower temperature of the circulating water compared to the first cooling target 132. That is, compared to the first system cooling tower equipment 10, the second system cooling tower equipment 20 needs to cool the circulating water to a lower temperature. In the case of cooling using outside air of the same temperature, in order to cool the circulating water to a lower temperature, more outside air can be transferred to the second system by increasing the rotation speed of the fan 242 of the second system cooling tower equipment 20. It is necessary to send it into the cooling tower 24. In other words, more power is consumed in the second cooling tower 24 when cooling the second object to be cooled, which requires cooling the circulating water to a lower temperature. The number of devices that can be used as the second cooling target that requires more power consumption to exhibit the performance of the device is limited compared to the first cooling target 132, so the number of devices is also the same as the first cooling target. It is often less than 132.

The second make-up water supply pump 321 and the second make-up water supply passage 322 basically have the same function and configuration as the first make-up water supply pump 311 and the first make-up water supply passage 312. have The difference from the first make-up water supply pump 311 and the first make-up water supply flow path 312 is that the make-up water is approximately the amount of water in the circulating water evaporated in the second cooling tower 24 (for example, as a unit) m ³ /h) and the amount of circulating water discharged outside the system from the second discharge flow path 25 (for example, m ³ /h in unit), the amount of circulating water is The second circulation flow path 21 is replenished with an amount of water equal to the value obtained by subtracting the amount of circulating water supplied to the second circulation flow path 21 (for example, in m ³ /h).

The second system cooling tower equipment 20 does not include the drug injection pump equipment 16, but instead includes a circulating water bypass channel 26.

The circulating water bypass flow path 26 is a flow path for receiving the supply of the scale prevention agent from the first circulation flow path 11 to the second circulation flow path 21 . Specifically, the circulating water bypass flow path 26 is provided in a portion of the first circulation flow path 11 between the discharge port side of the first circulation pump 12 and the inlet side of the first heat exchange section 13. The second circulation flow path 21 is branched from the first discharge flow path 15 which is connected to the lower water tank 244 of the second cooling tower 24, and the second circulation flow path 21 is connected to the first circulation flow path containing the anti-scaling agent. Part of the circulating water in 11 is supplied.

That is, the circulating water discharged (blown down) from the first circulating flow path 11 is reused as an anti-scaling agent to be supplied to the second circulating flow path 21. Therefore, the consumption amount of the scale preventive agent can be suppressed compared to the case where the scale preventive agent is injected into each of the first circulation flow path 11 and the second circulation flow path 21.

Furthermore, the circulating water that is branched from the first discharge channel 15 and supplied to the second circulating channel 21 via the circulating water bypass channel 26 contains more silica, calcium, etc. than makeup water. Contains many components that cause scale formation. Therefore, the blowdown from the second discharge flow path 25 is caused by the components that are concentrated due to the evaporation of the circulating water and cause scale formation, as well as the components that are caused by the blowdown from the first circulation flow path 11 via the circulating water bypass flow path 26. It is necessary to set the flow rate at a level that allows the components that cause scale formation contained in the concentrated circulating water supplied by the pump to be discharged. In other words, by appropriately setting the discharge amount (blowdown amount) from the second discharge flow path 25 and discharging components that cause scale formation, excessive concentration in the second system cooling tower equipment 20 can be prevented. It is possible to prevent this from happening.

Further, the circulating water bypass flow path 26 is provided with a bypass flow flow rate adjustment valve 27 (flow rate adjustment section). The bypass channel flow rate adjustment valve 27 adjusts the flow rate of circulating water flowing through the circulating water bypass channel 26 . Specifically, by adjusting the opening degree of the bypass channel flow rate adjustment valve 27, the amount of the scale prevention agent supplied per unit time (for example, in g/h) is kept within a preset range. The amount of circulating water (for example, in m ³ /h as a unit) from the first circulation passage 11 that is supplied to the second circulation passage 21 via the circulation water bypass passage 26 is adjusted in this manner. The preset range of the amount of the scale preventive agent supplied per unit time (for example, g/h as a unit) is determined according to the flow rate (for example, as a unit of m ³ ) in the second circulation flow path 21. , is the amount of the drug within a preset range that is determined to suppress scale precipitation in the second circulation channel 21. Alternatively, the mass of the scale preventive agent per flow rate in the first circulation flow path 11 (for example, in g/m ³ ) and the mass of the scale preventive agent per flow rate in the second circulation flow path 21 (for example, in g/m 3 ) The amount of circulating water (for example, m 3 /h) supplied per unit time via the circulating water bypass flow path 26 may be adjusted so that the ^amount of water (m ³ /m 3 ) is the same. Furthermore, if necessary, the scale preventive agent supplied in the amount of the scale preventive agent (for example, in g/h) that is further added to the amount of the scale preventive agent scattered by the fan 242 of the second cooling tower 24. You may adjust the amount.

The opening degree of the bypass channel flow rate adjustment valve 27 may be set without changing at a predetermined opening degree from the time of startup, depending on the overall configuration of the cooling system 1. Alternatively, an opening control section for the bypass channel flow rate adjustment valve 27 may be further provided to control the amount or scale of the circulating water containing the scale prevention agent supplied to the second circulating channel 21 as time passes from the start of operation. The degree of opening may be automatically or manually controlled so that the amount of the preventive agent (for example, in units of m ³ /h or g/h) falls within a preset range. In this case, a flow rate sensor that detects the flow rate (for example, in m ³ /h) of the circulating water supplied to the second circulating channel 21 via the circulating water bypass channel 26 and the second circulating channel 21 One or more concentration sensors may further be provided for detecting the concentration (eg, in g/m ³ ) of the antiscaling agent contained in the supplied circulating water. Alternatively, a concentration sensor that detects the concentration of the scale prevention agent (for example, in g/m ³ as a unit) may be provided at any location in the second circulation flow path 21. Alternatively, as an alternative to the concentration sensor described above, the circulating water supplied to the second circulation flow path 21 (or the circulating water at any appropriate location in the second circulation flow path 21) is intermittently sampled, The concentration of antiscaling agent may also be measured.

In this way, according to the cooling system 1, even if the second system cooling tower equipment 20 is not equipped with the chemical injection pump equipment 16, a portion of the circulating water in the first circulation channel 11 containing the scale-preventing chemical can be The circulating water is supplied to the second circulating flow path 21 via the circulating water bypass flow path 26 . Therefore, the anti-scaling agent can be efficiently supplied to the cooling tower equipment of another system (the second system cooling tower equipment 20) in which the temperature of the circulating water for cooling the object to be cooled is different. Furthermore, since there is no need to separately provide a drug injection pump facility in the second system cooling tower facility 20, the installation cost and running cost of the drug injection pump facility can be reduced. Furthermore, since there is no need to install the equipment, there is an advantage that the installation space can be reduced.

In particular, in the cooling system 1 of the first embodiment, the total amount of heat exchanged required for cooling the second object to be cooled is more significant than the total amount of heat exchanged required for cooling the first object 132 to be cooled. has decreased. Generally, in a cooling system, as the amount of exchanged heat required to cool the object to be cooled increases, it is necessary to increase the flow rate of circulating water in the circulation flow path within the cooling system. In the cooling system 1 of the first embodiment, the flow rate in the second circulation flow path 21 is lower than the flow rate in the first circulation flow path 11, so the flow rate in the circulation flow path is small (in other words, There is no need to separately provide a chemical injection pump facility in the second system cooling tower facility 20 (where the total amount of exchanged heat required for cooling the object to be cooled is small). Therefore, in the case where the total amount of exchanged heat required for cooling the second cooling object is lower than the total amount of exchanged heat required for cooling the first cooling object 132, as in the first embodiment, the main The invention can be widely and effectively applied.

Furthermore, when injecting a scale-preventing chemical into both the first circulation channel and the second circulation channel from one drug injection pump facility, it is necessary to greatly improve the performance of the drug injection pump facility itself. Compared to such a configuration, in the cooling system 1 of the first embodiment, it is only necessary to inject the anti-scaling agent into the first circulation channel 11, and there is no need to improve the performance of the agent injection pump equipment. The anti-scaling agent can be efficiently supplied using a method that allows for efficient supply of anti-scaling agents.

Furthermore, as described above, in the cooling system 1 of the first embodiment, the flow rate in the second circulation flow path 21 is smaller than the flow rate in the first circulation flow path 11. That is, a portion of the circulating water is supplied from the first circulation channel 11, which has a higher flow rate, to the second circulation channel 21, which has a lower flow rate. Therefore, an appropriate amount of the anti-scaling agent can be supplied to the second circulation channel 21 without significantly affecting the amount and temperature of the circulating water in both circulation channels. In addition, since the scale preventive agent is directly injected into the first circulation channel 11 of the first system cooling tower equipment 10 where the flow rate is higher, the scale prevention agent is directly injected into the first system cooling tower equipment 10 where the possibility of scale precipitation is higher. Since the anti-scaling agent is directly injected, the effects of the present invention can be exhibited more efficiently.

For example, the flow rate in the first circulation flow path 11/the flow rate in the second circulation flow path 21 = 100/1 to 5/1, preferably about 10/1. Specifically, the flow rate in the first circulation flow path 11 is, for example, about 50 to 800 m ³ /h, and the flow rate in the second circulation flow path 21 is, for example, about 4 to 100 m ³ /h. It is.

Here, in the first embodiment, for example, the flow rate in the first circulation channel 11 is F1 (m ³ /h), the amount of water evaporation in the first cooling tower 14 is E1 (m ³ /h), and the The amount of makeup water supplied to the first circulation channel 11 is S1 (m ³ /h), the amount of discharge from the first discharge channel 15 is B1 (m ³ /h), and the flow rate in the second circulation channel 21 is S1 (m 3 /h). is F2 (m ³ /h), the amount of water evaporation in the second cooling tower 24 is E2 (m ³ /h), and the amount of makeup water supplied to the second circulation flow path 21 is S2 (m ³ /h). , the amount of discharge from the second discharge channel 25 is B2 (m ³ /h), and the amount of circulating water supplied via the circulating water bypass channel 26 is BS (m ³ /h). At that time, the equation F1=F1-E1+S1-B1-BS should be approximately satisfied for the first circulation channel 11, and the equation F2=F2-E2+S2-B2+BS should be established for the second circulation channel 21. By adjusting each amount, the cooling system 1 can be continuously operated while the flow rate in the first circulation flow path 11 and the flow rate in the second circulation flow path 21 are substantially unchanged and stabilized.

Further, as described above, in the cooling system 1 of the first embodiment, the circulating water bypass flow path 26 is connected to the discharge port side of the first circulation pump 12 in the first circulation flow path 11 and the first heat exchange section. It branches from the first discharge flow path 15 provided between the inlet side of the cooling tower 13 and connects to the lower water tank 244 of the second cooling tower 24 . Therefore, by utilizing the discharge performance of the first circulation pump 12, the circulating water discharged (blown down) from the first discharge passage 15 is transferred to the scale prevention agent supplied to the second circulation passage 21. Therefore, circulating water containing anti-scaling agents can be efficiently supplied. Furthermore, before the circulating water is concentrated in the first cooling tower 14, a portion of the circulating water is supplied to the second circulating flow path 21, so that the anti-scaling agent can be applied at a more accurate and appropriate concentration. can be supplied. In addition, since the circulating water that is connected to the lower water tank 244 of the second cooling tower 24 and then supplied to the second cooling tower 24 is not immediately concentrated, the concentration does not change immediately. .

Furthermore, as described above, in the cooling system 1 of the first embodiment, the bypass flow rate adjustment valve 27 is provided in the circulating water bypass flow path 26, and the amount of scale prevention agent supplied per unit time is adjusted. The amount of the circulating water supplied to the second circulating flow path 21 is adjusted so that it falls within a preset range. Therefore, the scale prevention agent in the circulating water of the second system cooling tower equipment 20 can be supplied in a more accurate and appropriate amount.

(Embodiment 2)
Next, a cooling system 1A according to a second embodiment of the present invention will be described with reference to FIG. 3. The cooling system 1A according to the second embodiment basically has the same configuration as the cooling system 1 according to the first embodiment described above, and has the same effects. However, the cooling system 1A differs from the above-described first embodiment only in that the connection point of the circulating water bypass channel 26 in the second circulating channel 21 is different.

As shown in FIG. 3, the circulating water bypass passage 26 is located in the first circulation passage 11 between the discharge port side of the first circulation pump 12 and the inlet side of the first heat exchange section 13. Branching from the provided first discharge flow path 15, there is a connection between a portion of the second circulation flow path 21 where the second discharge flow path 25 is provided and the inlet side of the second heat exchange section 23. connected to the parts in between. Via the circulating water bypass channel 26, the second circulating channel 21 is supplied with a portion of the circulating water in the first circulating channel 11 containing the anti-scaling agent.

Even in a configuration in which the first circulation flow path 11 and the second circulation flow path 21 are connected at such a portion, the circulating water discharged (blown down) from the first discharge flow path 15 A portion of the circulating water can be supplied to the second circulating flow path 21 using the discharge performance of the first circulating pump 12, and before the circulating water is concentrated in the first cooling tower 14, the circulating water is Since a part of the amount is supplied to the second circulation channel 21, it is possible to supply the anti-scaling agent in a more accurate and appropriate amount. In addition, because part of the circulating water containing the scale prevention agent is supplied immediately before flowing into the circulating water branch channel in the second heat exchange section 23, the circulating water branch channel is narrow, etc. If there are circumstances where scale tends to precipitate, scale precipitation can be more efficiently prevented.

(Other embodiments)
In the first and second embodiments described above, the circulating water bypass flow path 26 branches from the first discharge flow path 15 to the second circulation flow path 21 (specifically, the lower part of the second cooling tower 24 Although the connection form is described above, the connection form is limited to such a connection form. Not done. Specifically, the circulating water bypass channel is connected to the first discharge channel and/or the first circulation channel so that a part of the circulating water in the first circulation channel can be supplied to the second circulation channel. If the circulation flow path and the second circulation flow path are connected, the same effects as the present invention can be achieved. For example, the circulating water bypass flow path is a part of the first circulation flow path immediately before branching into the first discharge flow path between the discharge port side of the first circulation pump and the installation location of the first discharge flow path. and the second circulation flow path may be connected.

In addition, in the above-mentioned Embodiments 1 and 2, the cooling systems 1 and 1A having two systems of cooling tower equipment were described, but the cooling system of the present invention is applied to cooling tower equipment of three or more systems. I don't mind. For example, in another embodiment, from the first circulation flow path of the first system cooling tower equipment to the second circulation flow path of the second system cooling tower equipment and the third circulation flow path of the third system cooling tower equipment A portion of the circulating water containing the anti-scaling agent may be supplied to the cooling tower equipment via a circulating water bypass flow path provided in each cooling tower facility. Alternatively, from the first circulation flow path of the first system cooling tower equipment to the second circulation flow path of the second system cooling tower equipment, and further from the second circulation flow path of the second system cooling tower equipment to the third system cooling A part of the circulating water containing an anti-scaling agent may be supplied to the third circulation channel of the tower facility via a circulating water bypass channel provided in each cooling tower facility. In other words, when applying the cooling system of the present invention to cooling tower equipment of three or more systems, the circulation flow path of the cooling tower equipment of one system and the circulation flow path of the cooling tower equipment of two or more systems may be connected in parallel via a circulating water bypass channel, or the circulating channels of cooling tower equipment of three or more systems may be connected in series via a circulating water bypass channel. . Furthermore, such parallel connections and series connections are combined between the circulation channels of cooling tower equipment in multiple systems, and the circulating water containing the anti-scaling agent is distributed through the respective circulating water bypass channels. A portion may each be provided.

Further, although the cooling systems 1 and 1A of the first and second embodiments described above are applied to cooling tower equipment having a simplified open type and counterflow type cooling tower, the cooling system of the present invention is applicable to other cooling tower equipment. It can be applied to cooling tower equipment equipped with any type of cooling tower. For example, the present invention may be applied to cooling tower equipment that includes a cross-flow type cooling tower, or may be applied to cooling tower equipment that includes a closed type cooling tower.

Furthermore, in the first and second embodiments described above, the circulating water containing the anti-scaling agent is passed from the first circulating channel 11 with a high flow rate to the second circulating channel 21 with a low flow rate via the circulating water bypass channel 26. Although the embodiment has been described in which a portion of the circulating water is supplied, the effects of the present invention can also be achieved even if a portion of the circulating water is supplied from the circulation channel with a lower flow rate to the circulation channel with a higher flow rate. can. Alternatively, in other embodiments, the flow rates in the two circulation channels are the same.

Furthermore, in the first and second embodiments described above, the first cooling target 132 is a device such as an air compressor or a hydraulic device that requires relatively high temperature of circulating water when cooling, and the second cooling target 132 is For example, we have described a form in which the temperature of the circulating water required for cooling is relatively low, such as a vacuum pump for bleed air. The temperature of the circulating water required to cool the equipment is not particularly limited. Specifically, the temperature of the circulating water in the first system cooling tower equipment and the temperature of the circulating water in the second system cooling tower equipment need only be different, and the temperature of the circulating water in the first system cooling tower equipment is different from the temperature of the circulating water in the second system cooling tower equipment. The temperature may be lower than the temperature of circulating water in the tower equipment. Furthermore, the number of second objects to be cooled relative to the number of first objects to be cooled is not limited either.

In addition, in the first and second embodiments described above, the cooling method in the heat exchange section is a direct cooling method, but if an appropriate cooling method is adopted for the first cooling object and the second cooling object, A method like this may also be used. For example, an indirect cooling method may be used.

Furthermore, in the cooling system of the present invention, makeup water may be replenished to any location in the first circulation flow path and the second circulation. For example, in another embodiment, make-up water is supplied between the circulating water outlet of the first cooling tower and the second cooling tower and the location where the drug injection pump equipment is injected via a path such as piping. be done.

In addition, in the first and second embodiments described above, a configuration is described in which makeup water is supplied to each circulation channel from one makeup water tank 30, but in other embodiments, makeup water is supplied from separate makeup water tanks 30. Makeup water is supplied at the same temperature or at a different temperature that matches the temperature of the circulating water for cooling each object to be cooled. Alternatively, the make-up water tank 30 in the first and second embodiments described above may be a water tank plant that is also used for other equipment.

Furthermore, in the cooling system of the present invention, the discharge passage in the cooling tower equipment of each system may be provided anywhere. For example, in another embodiment, a discharge flow path is provided in the lower water tank of the cooling tower in the cooling tower equipment of each system, and a portion of the circulating water (a portion of the cooled circulating water collected in the lower water tank) is provided. ) is configured to blow down to the effluent water tank treatment equipment outside the system.

Further, in the cooling system of the present invention, the discharge flow path in the cooling tower equipment of each system may be configured to allow flow rate adjustment. For example, in other embodiments, a flow rate regulating valve is provided in the discharge flow path. By making it possible to adjust the flow rate of the circulating water to be discharged, for example, the amount of discharged water at the time of startup of the cooling system and/or the amount of discharged over time from the start of operation can be adjusted, and the cooling system of the present invention can be adjusted. The startup and operation of the system can be made more stable.

Furthermore, in the cooling system of the present invention, the chemical injection pump equipment can be placed at any location where the anti-scaling agent can be injected into the first circulation flow path and mixed into the circulating water. I do not care. Specifically, the circulating water may be injected into any location in the first circulation channel as long as it has a large flow rate. For example, in another embodiment, an anti-scaling agent may be injected into the lower water tank of the first cooling tower in the same way as make-up water.

In addition, in the cooling system of the present invention, an underground water tank is provided below each circulation pump disposed in each circulation flow path, and each circulation pump sucks circulating water from the underground water tank and transfers the drawn circulating water to each It may also be allowed to flow into the heat exchange section. In the case of such a configuration, for example, makeup water may be supplied to each underground water tank. In addition, for the first system cooling tower equipment, an anti-scaling agent may also be injected into the underground water tank.

Furthermore, in the first and second embodiments described above, the bypass flow rate adjustment valve 27 is provided in the circulating water bypass flow path 26, but in other embodiments, the bypass flow rate adjustment valve is not provided. It doesn't have to be. For example, the flow rate flowing through the circulating water bypass channel can be adjusted by selecting, as the first circulation pump, a circulation pump with appropriate performance such as discharge amount and pressure.

In addition, in the cooling system of the present invention, the circulating water bypass channel can be connected to the first circulating channel and the circulating water bypass channel if a part of the circulating water in the first circulating channel can be supplied to the second circulating channel. The connection location of the second circulation flow path is not limited. For example, in another embodiment, the circulating water bypass flow path allows the second circulating water to flow from between the outlet side of the first cooling tower and the suction side of the first circulation pump in the first circulation flow path. It may be connected at any point on the road. In the cooling system of the present invention having such a configuration, in order to appropriately supply a part of the circulating water without using the discharge performance of the first circulating pump, for example, the first circulating water bypass flow path is The connection point of the circulation flow path may be provided at a higher position than the connection point of the second circulation flow path.

Further, after the circulating water is concentrated in the first cooling tower and before makeup water is supplied, a portion of the circulating water in the first circulating flow path is transferred to the second circulating flow channel via the circulating water bypass flow path. Even if the configuration of the connection point is such that the amount of moisture evaporated from the circulating water in the first cooling tower is small relative to the flow rate in the first circulation flow path, the scale preventive agent may be applied at an inappropriate concentration. It will not be supplied.

In addition, in the cooling system of the present invention, the supply amount of make-up water, the injection amount of the scale prevention agent, and the flow rate in the first circulation flow path 11 and the second circulation flow path 21 described in the above-mentioned Embodiments 1 and 2 are adjusted. The formulas for . . . do not necessarily have to be applied. For example, in other embodiments, the cooling system may include configurations other than those described in this disclosure, such as, for example, piping that flows out to or enters another location; In some cases, the supply amount, etc. may not apply.

The embodiments disclosed herein are illustrative in all respects and should be understood not to be restrictive. The scope of the present invention is indicated by the claims rather than the above description, and it is intended that all changes within the meaning and range equivalent to the claims are included.

1, 1A Cooling system 10 First system cooling tower equipment 20 Second system cooling tower equipment 11 First circulation channel 21 Second circulation channel 12 First circulation pump 22 Second circulation pump 13 First heat Exchange part 131 First heat exchanger 132 First cooling object 133 Circulating water branch flow path 23 Second heat exchange part 14 First cooling tower 24 Second cooling tower 141, 241 Filler 142, 242 Fan 143 , 243 Water sprinkler 144, 244 Lower water tank 30 Make-up water tank 40 Effluent tank treatment equipment 15 First discharge channel 25 Second discharge channel 16 Chemical injection pump equipment 26 Circulating water bypass channel 27 Bypass channel flow rate Regulating valve

Claims (5)

a first system cooling tower equipment for cooling a first cooling object to a first temperature; and a second system cooling tower equipment for cooling a second cooling object to a second temperature different from the first temperature. Equipped with tower equipment,
The first system cooling tower equipment includes a first circulation passage through which circulating water circulates, and a first circulation passage arranged in the first circulation passage through which the circulating water flows into a first heat exchange section. a pump, the first heat exchange unit configured to exchange heat between the circulating water introduced by the first circulating pump and the first cooling target to cool the first cooling target; a first cooling tower that cools the circulating water whose temperature has increased due to heat exchange in the heat exchange section; a first make-up water supply section that supplies water to the first circulation flow path; and a first makeup water supply section that supplies water to the first circulation flow path; a first discharge channel for discharging a part of the scale, and a drug injection part for injecting a scale prevention drug into the first circulation channel,
The second system cooling tower equipment includes a second circulation passage through which circulating water circulates, and a second circulation passage which is arranged in the second circulation passage and causes the circulation water to flow into a second heat exchange section. a pump, the second heat exchange unit configured to exchange heat between the circulating water introduced by the second circulation pump and the second object to be cooled, and cool the second object to be cooled; a second cooling tower that cools the circulating water whose temperature has increased due to heat exchange in the heat exchange section; a second make-up water supply section that supplies water to the second circulation flow path; and a second makeup water supply section that supplies water to the second circulation flow path; a second discharge flow path for discharging a portion of the water, and a circulating water bypass flow path for receiving the supply of the scale prevention agent to the second circulation flow path;
The circulating water bypass flow path is capable of supplying a portion of the circulating water in the first discharge flow path and/or the first circulation flow path containing the scale prevention agent to the second circulation flow path. the first discharge flow path and/or the first circulation flow path and the second circulation flow path are connected,
A cooling system in which a flow rate in the first circulation flow path is greater than a flow rate in the second circulation flow path . The cooling system according to claim 1 , wherein the circulating water bypass flow path is branched from the first discharge flow path and connected to the second circulation flow path. The first discharge flow path is provided in a portion of the first circulation flow path between a discharge port side of the first circulation pump and an inlet side of the first heat exchange section. The cooling system according to item 2 . The circulating water bypass channel supplies the anti-scaling agent to the second circulating channel via the circulating water bypass channel so that the amount of the anti-scaling agent supplied per unit time falls within a preset range. The cooling system according to any one of claims 1 to 3 , further comprising a flow rate adjustment unit that adjusts the amount of the circulating water from the first circulation flow path. 5. The method according to claim 1, wherein the total amount of heat exchanged required for cooling the second object to be cooled is lower than the total amount of heat exchanged required for cooling the first object to be cooled. Cooling system as described.

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