JP2013000678A - Water treatment system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water treatment system that can suppress excessive supply of a chemical agent.SOLUTION: The water treatment system includes: a cooling tower 110; a circulating water line L110; a chemical agent supply means 150; a water quality detection means 134 that detects the water quality of circulating water W110; a clocking means that clocks a first time zone and a second time zone; a process execution means 162 that executes a chemical agent supply starting process of supplying the chemical agent from the chemical agent supply means 150 to the circulating water line L110 in the first time zone and a chemical agent supply stopping process of stopping the chemical agent in the second time zone; and a process control means 163 that executes the chemical agent supply starting process when the water quality of the circulating water W 110 detected by the water quality detection means 134 is lower than the water quality at the start of supply of the chemical agent, executes the chemical agent supply-stopping process after a lapse of the first time zone, and executes the chemical agent supply-starting process after a lapse of the second time zone and when the water quality of the circulating water W 110 detected by the water quality detection means 134 is lower than the water quality at the end of supply of the chemical agent.

Description

  The present invention relates to a water treatment system that circulates circulating water between a cooling tower and a device to be cooled.

  In commercial buildings, industrial plants, etc., cooling water is used to cool a device to be cooled (cooling load device) such as a heat exchanger incorporated in an air conditioner or a refrigerator. From the viewpoint of saving the cooling water, the cooling water is circulated and used while being cooled in the cooling tower (hereinafter, the circulating cooling water is appropriately referred to as “circulated water”). The circulating water circulates between the cooling tower and the apparatus to be cooled through the circulating water line (the circulating water supply line and the circulating water recovery line).

  In the water treatment system, when the circulating water is continuously circulated, the quality of the circulating water gradually deteriorates and various water troubles that reduce the cooling capacity occur. Therefore, in order to improve the quality of the circulating water, chemicals such as slime control agents, anticorrosive agents, scale inhibitors, etc. are mainly supplied to the circulating water line (hereinafter also referred to as “medicine injection” where appropriate). ing.

  As a method of supplying a medicine to the circulating water line, a so-called timer medicine injection system is known in which the supply and stop of the medicine are alternately repeated every predetermined time. Further, a method is known in which the ORP (oxidation-reduction potential) value of circulating water flowing through the circulating water line is measured with a sensor, and the supply amount of a chemical comprising an oxidation-type slime control agent is automatically adjusted. In this method, the supply of the medicine is started when the ORP value of the circulating water reaches the medicine start water quality, and then the medicine supply is stopped when the ORP value of the circulating water reaches the medicine stop water quality. Yes (see Patent Document 1).

JP 2003-154241 A

  In the timer drug injection method described above, the drug supply is often excessive. This increases the user's economic burden. On the other hand, in the method of automatically adjusting the supply amount of the medicine according to the ORP value of the circulating water, it is possible to suppress excessive supply of the medicine as compared with the timer medicine injection method. However, since the route of the circulating water line is generally long, even if a medicine is supplied to a part of the route, it is not immediately reflected in the ORP value. For this reason, if the medicine is continuously supplied until the ORP value is equal to or higher than the predetermined value, the medicine may be excessively supplied as a result.

  Therefore, an object of this invention is to provide the water treatment system which can suppress the excessive supply of a chemical | medical agent.

  The present invention provides a cooling tower for cooling the circulating water supplied to the apparatus to be cooled, a circulating water line for circulating the circulating water between the cooling tower and the apparatus to be cooled, and supplying a chemical to the circulating water line. A medicine supply means, a water quality detection means for detecting the quality of circulating water flowing through the circulating water line, a first time zone for supplying medicine from the medicine supply means to the circulating water line, and a medicine from the medicine supply means A timing unit that counts a second time zone that is not supplied to the circulating water line; and a timing of the first time zone by the timing unit is started, and a drug is supplied from the drug supply unit to the circulating water line within the first time zone. A medicine supply start process for supplying the medicine; and the time measurement means starts measuring the second time zone, and stops the supply of the medicine from the medicine supply means to the circulating water line within the second time zone. A process execution means for executing the agent supply stop process, and the process execution means when the water quality of the circulating water detected by the water quality detection means is lower than the medicine supply start water quality that is the upper limit threshold of water quality for starting the supply of the medicine To start the medicine supply start process, and when the time measuring means finishes counting the first time zone, the process executing means executes the medicine supply stop process, and the time measuring means finishes the second time zone timing. And when the quality of the circulating water detected by the water quality detection means falls below the chemical supply end water quality, which is the lower limit threshold value of the quality of water for stopping the supply of the medicine, the process execution means executes the medicine supply start process. And a water treatment system comprising the means.

  Further, in the water treatment system, the process control means, when the quality of the circulating water detected by the water quality detection means exceeds the quality of the chemical supply end water during the execution of the chemical supply start process, It is preferable to stop the execution of the medicine supply start process.

  In the water treatment system, it is preferable that the water quality detection means is a redox potential detection device that detects a redox potential of circulating water flowing through the circulating water line.

  ADVANTAGE OF THE INVENTION According to this invention, the water treatment system which can suppress the excessive supply of a chemical | medical agent can be provided. As a result, the drug concentration in the circulating water can be maintained within an appropriate range.

It is a schematic block diagram which shows the water treatment system of embodiment. It is a functional block diagram concerning control of water treatment system 100 of an embodiment. It is a time chart which shows the relationship between each process which the process execution part 162 of the water treatment system 100 performs, and supply of a chemical | medical agent. 7 is a flowchart showing a processing procedure when the control unit 102 of the water treatment system 100 controls the supply of a medicine from the medicine supply device 150 to the circulating water line L110. It is a flowchart which shows the whole process sequence in case the control part 102 of the water treatment system 100 implements a blow process. It is a flowchart which shows the process sequence in case the control part 102 of the water treatment system 100 implements a 1st blow process. It is a flowchart which shows the process sequence in case the control part 102 of the water treatment system 100 implements a 2nd blow process.

  Hereinafter, a schematic configuration of a water treatment system 100 according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram showing a water treatment system 100 of the present embodiment.

  As shown in FIG. 1, the water treatment system 100 of this embodiment circulates circulating water W110 (cooling water) in order to cool a cooled device 131 such as a heat exchanger incorporated in an air conditioner or a refrigerator. It is a system to let you. The circulating water W110 is circulated and used while being cooled by the cooling tower 110 from the viewpoint of saving. The cooling tower 110 in this embodiment is a so-called open type cooling tower.

  The water treatment system 100 of the present embodiment includes, as main components, a cooling tower 110, an apparatus to be cooled 131, an electrical conductivity measuring device 133, an oxidation-reduction potential measuring device 134 as water quality detecting means, and a chemical supply means. As a medicine supply device 150 and a system control device 101. The water treatment system 100 includes a circulating water line L110 and a makeup water line L120. The “line” is a general term for a line capable of fluid flow such as a flow path, a path, and a pipeline. Moreover, in FIG. 1, the path | route of electrical connection is shown with the broken line.

  The cooling tower 110 is a facility for cooling the circulating water W110 for cooling the apparatus to be cooled 131. The cooling tower 110 includes a tower main body 111, a water sprinkling unit 112, a storage unit 116, a louver 118, a fan 120, an upper opening 121, and a fan driving unit 122.

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

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

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

  The storage part 116 is a site | part which stores the circulating water W110 sprayed from the water sprinkling part 112. FIG. The storage part 116 is provided in the lower part of the tower main body 111. The circulating water W110 sprayed downward from the sprinkler 112 is cooled by exchanging heat with the outside air E1 (described later) having a low temperature in the process of falling inside the tower body 111. A circulating water supply line L111 (described later) of the circulating water line L110 is connected to the bottom of the storage unit 116. The circulating water W110 stored in the storage unit 116 is supplied to the cooled apparatus 131 via the circulating water supply line L111.

  The louver 118 is a vent hole for introducing outside air (air) E1 into the tower main body 111. Outside air E1 outside the tower body 111 is introduced into the tower body 111 via the louver 118.

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

  The fan 120 is disposed in the upper opening 121. The fan 120 is connected to a rotation shaft (reference number omitted) of the fan driving unit 122. The fan 120 generates a negative pressure inside by rotating, and introduces the outside air E1 from the louver 118 to the inside of the tower main body 111, and the outside air E1 introduced into the inside of the tower main body 111 through the upper opening 121. To the outside of the tower body 111.

  The fan drive unit 122 is a drive source that rotates the fan 120. The fan drive unit 122 is configured by a motor (not shown). The fan drive unit 122 is disposed above the fan 120. The fan driving unit 122 is electrically connected to the system control device 101. Operation (drive and stop) of the fan drive unit 122, adjustment of the rotation speed (shift), and the like are controlled by a drive signal from the system control device 101.

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

  The circulating water supply line L111 is a line that connects between the storage unit 116 of the cooling tower 110 and the apparatus to be cooled 131. The circulating water supply line L111 can supply the circulating water W110 stored in the storage unit 116 to the cooled device 131.

  A circulating water pump 132 is connected in the middle of the circulating water supply line L111. The circulating water pump 132 can send out the circulating water W110 from the upstream side to the downstream side of the circulating water line L110 (the circulating water supply line L111, the circulating water recovery line L112). The circulating water pump 132 is electrically connected to the system controller 101. The operation (drive and stop) of the circulating water pump 132 is controlled by a drive signal from the system controller 101.

  An upstream end portion of the measurement line L113 is connected to the connection portion J112 of the circulating water supply line L111. A second temperature sensor 136 is connected to the connection portion J114 of the circulating water supply line L111. The second temperature sensor 136 is a temperature measuring device that measures the temperature of the circulating water W110 sent out from the storage unit 116 of the cooling tower 110 (hereinafter referred to as “exit temperature TP2”). The second temperature sensor 136 is electrically connected to the system control device 101. The outlet temperature TP2 of the circulating water W110 measured by the second temperature sensor 136 is transmitted to the system controller 101.

  The circulating water recovery line L112 is a line that connects between the cooled device 131 and the sprinkler 112 of the cooling tower 110. The circulating water recovery line L <b> 112 can recover the circulating water W <b> 110 heated by heat exchange in the apparatus to be cooled 131 to the sprinkler 112 of the cooling tower 110. The downstream side of the circulating water recovery line L112 is branched into a plurality of lines at the branch portion J111. The branched line is connected to each of the plurality of sprinklers 112.

  The first temperature sensor 135 is connected to the connection portion J115 of the circulating water recovery line L112. The first temperature sensor 135 is a temperature measuring device that measures the temperature of the circulating water W110 collected in the water sprinkling unit 112 of the cooling tower 110 (hereinafter referred to as “inlet temperature TP1”). The first temperature sensor 135 is electrically connected to the system control device 101. The inlet temperature TP1 of the circulating water W110 measured by the first temperature sensor 135 is transmitted to the system control apparatus 101.

  The apparatus to be cooled 131 is various devices such as a heat exchanger that needs to be cooled by the circulating water W110. 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. The apparatus to be cooled 131 includes a circulating water flow path (not shown) inside.

  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. Therefore, the circulating water flow path, together with the circulating water supply line L111 and the circulating water recovery line L112, forms a circulation path for circulating the circulating water W110 between the tower body 111 of the cooling tower 110 and the cooled device 131.

  The electrical conductivity measuring device 133 is a device that measures the electrical conductivity of the circulating water W110. The electrical conductivity measuring device 133 is connected to the circulating water line L110 at the connection portion J112 via the measurement line L113. In addition, the electrical conductivity measuring device 133 is electrically connected to the system control device 101. The electrical conductivity measured by the electrical conductivity measuring device 133 is transmitted to the system control device 101 as a detection signal. The electrical conductivity measuring device 133 measures the electrical conductivity at a predetermined time interval (or real time) and transmits it to the system control device 101.

  The oxidation-reduction potential measuring device 134 is a water quality detection unit that indirectly detects a supply concentration of a later-described drug (oxidation-type slime control agent) by measuring the ORP value of the circulating water W110. In the water treatment system 100 of the present embodiment, as described later, the supply or stop of the chemical is controlled based on the ORP value of the circulating water W110 measured by the oxidation-reduction potential measuring device 134. The oxidation-reduction potential measuring device 134 is connected to the circulating water line L110 at the connection portion J112 via the measurement line L113. The oxidation-reduction potential measuring device 134 is electrically connected to the system control device 101. The ORP value measured by the oxidation-reduction potential measuring device 134 is transmitted to the system control device 101 as a detection signal. The oxidation-reduction potential measuring device 134 measures the ORP value at a predetermined time interval (or real time) and transmits it to the system control device 101.

  The medicine supply device 150 is a facility for supplying medicine to the circulating water W110 stored in the storage unit 116 of the cooling tower 110. The medicine supply device 150 includes a medicine tank 151 and a medicine supply pump 152. The chemical tank 151 is a container that stores an oxidized slime control agent as a chemical for improving the quality of the circulating water W110. The slime control agent is a drug for suppressing the growth of microorganisms such as fungi and algae in the circulating water W110. As the oxidation type slime control agent, for example, a halogen-based oxidizing agent such as sodium hypochlorite or an oxygen-based oxidizing agent such as hydrogen peroxide is used. The drug supply pump 152 is connected to the storage unit 116 of the cooling tower 110 via the drug supply line L130. The medicine supply pump 152 can send the medicine stored in the medicine tank 151 to the storage section 116 of the cooling tower 110 via the medicine supply line L130. In addition, the medicine supply pump 152 is electrically connected to the system control device 101. The operation (drive and stop) of the medicine supply pump 152 is controlled by a drive signal from the system controller 101.

  The cooling tower 110 is connected to a makeup water line L120. The makeup water line L120 is a line for replenishing the makeup water W121 to the storage section 116 of the cooling tower 110. The upstream side of the makeup water line L120 is a first makeup water line L121 connected to a supply source (not shown) of raw water W120 such as tap water or industrial water. On the other hand, the downstream side of the makeup water line L120 branches to the second makeup water line L122 and the third makeup water line L123 at the connecting portion J121. In the first makeup water line L121, a raw water pump 141 and a raw water valve 142 are provided in order from the upstream side.

  The raw water pump 141 can send the raw water W120 from the upstream side to the downstream side of the makeup water line L120. The raw water pump 141 is electrically connected to the system control device 101. The operation (drive and stop) of the raw water pump 141 is controlled by a drive signal from the system controller 101.

  The raw water valve 142 can open and close the makeup water line L120 on the discharge side of the raw water pump 141. The raw water valve 142 is electrically connected to the system controller 101 (not shown). The opening and closing of the valve body in the raw water valve 142 is controlled by a drive signal from the system control device 101.

  The downstream end of the second makeup water line L122 is connected to the tower body 111 of the cooling tower 110. A makeup water valve 143 is provided in the middle of the second makeup water line L122. The makeup water valve 143 is a water supply facility that forcibly supplies the makeup water W121 to the storage section 116 by opening and closing the second makeup water line L122. The makeup water valve 143 is electrically connected to the system control device 101. The opening and closing of the valve body in the makeup water valve 143 is controlled by a drive signal from the system control device 101.

  The downstream end of the third makeup water line L123 is connected to the tower main body 111 of the cooling tower 110. A water faucet 144 is provided at the downstream end of the third makeup water line L123. The water tap 144 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> 110 stored in the storage unit 116. When the water level of the circulating water W110 stored in the storage unit 116 decreases in the water tap 144, the ball tap operates and the supply water W121 flowing through the third supply water line L123 is supplied to the storage unit 116.

  The drain line L140 is connected to the bottom of the storage part 116 and extends downward. The drainage line L140 is a line for forcibly discharging the circulating water W110 stored in the storage unit 116 of the cooling tower 110 to the outside of the water treatment system 100 in the first and second blow processes described later. A drain valve 145 is provided in the middle of the drain line L140. The drain valve 145 can open and close the drain line L140. The drain valve 145 is electrically connected to the system controller 101. The opening and closing of the valve body in the drain valve 145 is controlled by a drive signal from the system control device 101.

  The cooling tower 110 is connected to an overflow line L150 in addition to the above-described circulating water line L110, makeup water line L120, chemical supply line L130, and drainage line L140. The overflow line L150 discharges the circulating water W110 overflowing from the storage part 116 of the cooling tower 110 to the outside of the water treatment system 100 when the makeup water valve 143 is opened and the makeup water W121 is forcibly supplied. Line. That is, the overflow line L150 is stored in the storage unit 116 of the cooling tower 110 by controlling the opening and closing of the replenishing water valve 143 instead of the opening and closing control of the drain valve 145 in the first and second blow processes described later. It functions as a line for forcibly discharging the circulating water W110 out of the water treatment system 100.

  Next, with reference to FIG.2 and FIG.3, the function which concerns on control of the water treatment system 100 of this embodiment is demonstrated. FIG. 2 is a functional block diagram relating to control of the water treatment system 100 of the present embodiment. FIG. 3 is a time chart showing the relationship between each process executed by the process execution unit 162 and the supply of the medicine.

  The system control apparatus 101 controls the operation of each unit in the water treatment system 100 of the present embodiment. As shown in FIG. 2, the system control apparatus 101 is electrically connected to, for example, the fan drive unit 122, the circulating water pump 132, the raw water pump 141, the makeup water valve 143, the drain valve 145, and the medicine supply pump 152.

  The system control device 101 is electrically connected to each measurement device of the water treatment system 100 and receives measurement information from these measurement devices. For example, the system control device 101 is electrically connected to the electrical conductivity measuring device 133, and receives the electrical conductivity EC of the circulating water W110 measured by the electrical conductivity measuring device 133 as a detection signal. Further, the system control device 101 is electrically connected to the oxidation-reduction potential measurement device 134 and receives the ORP value Q0 of the circulating water W110 measured by the oxidation-reduction potential measurement device 134 as a detection signal.

  The system control apparatus 101 is electrically connected to the first temperature sensor 135 and the second temperature sensor 136. The system control apparatus 101 receives the inlet temperature TP1 of the circulating water W110 measured by the first temperature sensor 135 and the outlet temperature TP2 of the circulating water W110 measured by the second temperature sensor 136 as detection signals.

  In the system control apparatus 101, the received electrical conductivity EC, ORP value Q0, inlet temperature TP1 and outlet temperature TP2 of the circulating water W110 are stored in the memory 103 (described later). Further, the electrical conductivity EC, the ORP value Q0, the inlet temperature TP1, and the outlet temperature TP2 are sequentially updated to the latest values at predetermined time intervals (or real time). As for the electrical conductivity EC, a value (EC1) at the start of time measurement in a third time zone T3 to be described later (EC1) and a value at the end of time measurement (EC2) are held in the memory 103.

  The system control apparatus 101 includes a control unit 102 and a memory 103. The control unit 102 includes a timing unit 161 as a timing unit, a process execution unit 162 as a process execution unit, a process control unit 163 as a process control unit, a concentration determination unit 164, a blow processing control unit 165, Have The functions of the timer unit 161, process execution unit 162, process control unit 163, enrichment determination unit 164, and blow processing control unit 165 in the control unit 102 are realized by a microprocessor (not shown) including a CPU and an internal memory.

  The time measuring unit 161 measures the first time zone T1 and the second time zone T2. The first time zone T <b> 1 is a supply time of the drug from the drug supply device 150 to the storage unit 116 of the cooling tower 110. The second time period T2 is a standby time for stopping the supply of the drug from the drug supply device 150 to the storage unit 116 of the cooling tower 110.

  Moreover, the time measuring part 161 times the 3rd time slot | zone T3, the 4th time slot | zone T4, and the 5th time slot | zone T5 as needed in a blow process. The third time zone T3 is a waiting time when observing a change in the electrical conductivity EC. The fourth time zone T4 is the execution time of the blow process. The fifth time zone T5 is a standby time during which the blow process is not performed.

  The process execution unit 162 starts time measurement in the first time zone T1 by the time measurement unit 161 under the control of the process control unit 163, which will be described later, and also stores the cooling tower 110 from the drug supply device 150 in the first time zone T1. The medicine supply start process P1 for causing the medicine to be supplied to 116 is executed.

  In addition, the process execution unit 162 starts time measurement in the second time zone T2 by the time measurement unit 161 under the control of the process control unit 163, and also stores the cooling tower 110 from the drug supply device 150 in the second time zone T2. The medicine supply stop process P2 for stopping the supply of the medicine to 116 is executed.

  When the ORP value Q0 of the circulating water W110 detected by the oxidation-reduction potential measuring device 134 is less than the chemical supply start ORP value Q1, which is the upper limit threshold value of water quality for starting the supply of the chemical, the process control unit 163 The process execution unit 162 executes the medicine supply start process P1. Further, the process control unit 163 causes the process execution unit 162 to execute the medicine supply stop process P2 when the time measurement unit 161 finishes counting the first time period T1. Further, the process control unit 163 completes the time measurement in the second time zone T2 in the time measuring unit 161, and the ORP value Q0 of the circulating water W110 detected by the oxidation-reduction potential measuring device 134 determines the water quality at which the supply of the chemical is stopped. If the drug supply stop ORP value Q2 which is the lower limit threshold value is less than, the process execution unit 162 causes the drug supply start process P1 to be executed again.

  In addition, when the chemical supply start process P1 is being performed, the process control unit 163 determines that the ORP value Q0 of the circulating water W110 detected by the oxidation-reduction potential measuring device 134 is equal to or higher than the chemical supply stop ORP value Q2. The execution of the medicine supply start process P1 by the process execution unit 162 is stopped.

  Here, the process switching control by the process control unit 163 will be described with reference to FIG. (A) of FIG. 3 has shown the timing of the start (ON) and stop (OFF) of a chemical injection. The period of the ON state indicates the first time zone T1. In this period, the medicine supply start process P1 is executed. The period of the OFF state indicates the second time zone T2. In this period, the medicine supply stop process P2 is executed.

  FIG. 3B is a graph schematically showing an example of a change in the ORP value. The horizontal axis represents time (t), and the vertical axis represents the ORP value (Q). As shown in FIG. 3, when the ORP value Q0 of the circulating water W110 detected by the oxidation-reduction potential measuring device 134 becomes less than the chemical supply start ORP value Q1, the process control unit 163 sends a process execution unit 162 to the process execution unit 162. The medicine supply start process P1 is executed. This medicine supply start process P1 is executed during the first time period T1. When the ORP value Q0 of the circulating water W110 becomes equal to or higher than the chemical supply stop ORP value Q2 during the first time period T1, the process control unit 163 executes the chemical supply start process P1 by the process execution unit 162. Stop.

  The process control unit 163 causes the process execution unit 162 to execute the medicine supply stop process P2 when the first time period T1 has elapsed since the execution of the medicine supply start process P1. That is, the process control unit 163 performs switching control from the medicine supply start process P1 to the medicine supply stop process P2.

  The process control unit 163 periodically acquires the ORP value Q0 of the circulating water W110 during the second time period T2, and monitors the change state of the water quality. When the ORP value Q0 becomes equal to or higher than the medicine supply stop ORP value Q2, the process execution unit 162 stops the execution of the medicine supply start process P1 at that time. In this case, the process control unit 163 does not execute process switching control.

  On the other hand, if the ORP value Q0 of the circulating water W110 is less than the chemical supply stop ORP value Q2 when the second time zone T2 has elapsed after the chemical supply stop process P2 is executed, the process control unit 163 performs the process. The execution unit 162 is caused to execute the medicine supply start process P1. That is, the process control unit 163 performs switching control from the medicine supply stop process P2 to the medicine supply start process P1.

  As described above, in the first time zone T1, the process control unit 163 causes the process execution unit 162 to execute the medicine supply start process P1 and performs drug injection. In the second time zone T2, the process control unit 163 sends the medicine to the process execution unit 162. The supply stop process P2 is executed to temporarily stop the drug injection. During operation of the water treatment system 100, the process control unit 163 performs control to switch between the chemical supply start process P1 and the chemical supply stop process P2 until the ORP value Q0 of the circulating water W110 becomes equal to or higher than the chemical supply stop ORP value Q2. Run repeatedly.

  The first time zone T1 and the second time zone T2 are appropriately set according to the capacity of the medicine supply pump 152 and the path length of the circulating water line L110. Also, the medicine supply start ORP value Q1 and the medicine supply stop ORP value Q2 are appropriately set depending on the water quality to be maintained in the circulating water W110 (for example, the drug concentration at which the number of viable bacteria in the circulating water W110 is a predetermined value or less). Is done.

Returning to FIG. 2 again, the configuration of the system control apparatus 101 will be described.
The concentration determination unit 164 determines whether or not the electrical conductivity EC measured by the electrical conductivity measuring device 133 is equal to or greater than a predetermined threshold. As the predetermined threshold, for example, an upper limit electric conductivity that can prevent the occurrence of obstacles such as scale adhesion and corrosion in the cooled apparatus 131 due to an increase in the concentration of the circulating water W110 is set.

  The blow process control unit 165 performs the first blow process and the second blow process based on the temperature difference between the inlet temperature TP1 and the outlet temperature TP2 of the circulating water W110 in the cooling tower 110 and the determination result of the concentration determination unit 164. Control switching. The first blow process is a normal blow process. The second blow process is a blow process for backup when a failure or the like occurs in the electrical conductivity measuring device 133. These blow processes will be described later.

  The memory 103 stores a control program and various data necessary for controlling the water treatment system 100. Specifically, in the memory 103, a control program for operating various functions necessary for controlling the water treatment system 100, the electrical conductivity EC measured by the electrical conductivity measuring device 133, and the redox potential measuring device 134 are measured. The ORP value Q0, various threshold values, various calculated values, and the like are stored in predetermined storage areas assigned to them.

  Next, in the water treatment system 100 of the present embodiment, an operation when supplying a drug from the drug supply device 150 to the circulating water line L110 will be described with reference to FIG. FIG. 4 is a flowchart showing a processing procedure when the control unit 102 of the water treatment system 100 controls the supply of the medicine from the medicine supply device 150 to the circulating water line L110. The control of the flowchart shown in FIG. 4 is executed by the control unit 102 based on a control program stored in the memory 103. 4 is repeatedly executed during operation of the water treatment system 100.

  In step ST101, the process control unit 163 acquires the ORP value Q0 of the circulating water W110.

  In step ST102, the process control unit 163 determines whether or not the acquired ORP value Q0 is less than a medicine supply start ORP value Q1 that is an upper limit threshold of water quality at which medicine supply is started. In step ST102, when the process control unit 163 determines that ORP value Q0 <drug supply start ORP value Q1 (YES), the process proceeds to step ST103. In step ST102, if the process control unit 163 determines that ORP value Q0 ≧ medicine supply start ORP value Q1 (NO), the process returns to step ST101 again.

  In step ST103 transferred from step ST102 (YES determination), the process control unit 163 causes the process execution unit 162 to execute the medicine supply start process P1. The process execution unit 162 starts the time measurement of the first time zone T1 by the time measuring unit 161 and supplies the drug from the drug supply device 150 to the storage unit 116 of the cooling tower 110 within the first time zone T1 (start of drug supply start). Process P1).

  By executing the medicine supply start process P <b> 1, the medicine is supplied from the medicine supply device 150 to the storage unit 116 of the cooling tower 110. The chemical | medical agent supplied to the storage part 116 of the cooling tower 110 circulates between the tower main body 111 of the cooling tower 110 and the to-be-cooled apparatus 131 via the circulating water line L110 with the circulating water W110.

  In step ST104, the process control unit 163 acquires the ORP measurement value Q0 of the circulating water W110.

  In step ST105, the process control unit 163 determines whether or not the ORP value Q0 of the circulating water W110 is equal to or higher than the chemical supply stop ORP value Q2 that is a lower limit threshold of water quality that stops the supply of chemicals. If the process control unit 163 determines in this step ST105 that ORP value Q0 ≧ medicine supply stop ORP value Q2 (YES), the process proceeds to step ST106. In step ST105, if the process control unit 163 determines that ORP value Q0 <drug supply stop ORP value Q2 (NO), the process proceeds to step ST107.

  In step ST106 which shifted from step ST105 (YES determination), the process control unit 163 causes the process execution unit 162 to stop the execution of the medicine supply start process P1. The process execution unit 162 ends (resets) the time measurement of the first time zone T1 by the time measurement unit 161 to stop the execution of the drug supply start process P1, and also transfers from the drug supply device 150 to the storage unit 116 of the cooling tower 110. Stop the supply of drugs. In step ST106, after the process control unit 163 stops the medicine supply start process P1, the process returns to step ST101 again.

  On the other hand, in step ST107 that has shifted from step ST105 (NO determination), the process control unit 163 determines whether or not the timing of the first time zone T1 in the timing unit 161 has ended. In step ST107, when the process control unit 163 determines that the time measurement of the first time zone T1 has ended (YES), the process proceeds to step ST108. If the process control unit 163 determines in step ST107 that the time measurement in the first time zone T1 has not ended (NO), the process returns to step ST104.

In step ST108 shifted from step ST107 (YES determination), the process control unit 163 causes the process execution unit 162 to execute the medicine supply stop process P2. The process execution unit 162 starts measuring time in the second time zone T2 by the time measuring unit 161 and stops supply of the drug from the drug supply device 150 to the storage unit 116 of the cooling tower 110 in the second time zone T2 ( Drug supply stop process P2).
In step ST109, the process control unit 163 acquires the ORP measurement value Q0 of the circulating water W110.

  In step ST110, the process control unit 163 determines whether or not the ORP value Q0 of the circulating water W110 is equal to or greater than the chemical supply stop ORP value Q2. In step ST110, when the process control unit 163 determines that ORP value Q0 ≧ drug supply stop ORP value Q2 (YES), the process proceeds to step ST111. In step ST110, if the process control unit 163 determines that ORP value Q0 <drug supply stop ORP value Q2 (NO), the process proceeds to step ST112.

  In step ST111 shifted from step ST110 (YES determination), the process control unit 163 causes the process execution unit 162 to stop the execution of the medicine supply stop process P2. The process execution unit 162 ends (resets) the time measurement in the second time zone T2 by the time measurement unit 161 in order to stop the execution of the medicine supply stop process P2. In addition, since supply of the chemical | medical agent from the chemical | medical agent supply apparatus 150 to the storage part 116 of the cooling tower 110 has already stopped, control of the chemical | medical agent supply apparatus 150 (stop of the chemical | medical agent supply pump 152) is not performed. After the process control unit 163 causes the process execution unit 162 to stop the execution of the medicine supply stop process P2, the process returns to step ST101 again.

  On the other hand, in step ST112 that has shifted from step ST110 (NO determination), the process control unit 163 determines whether or not the timing of the second time zone T2 in the timing unit 161 has ended. In step ST112, when the process control unit 163 determines that the time measurement in the second time zone T2 has ended (YES), the process returns to step ST103. If the process control unit 163 determines in step ST112 that the time measurement in the second time period T2 has not ended (NO), the process returns to step ST109.

  Next, in the water treatment system 100 of this embodiment, the operation | movement in the case of performing the blow process of the circulating water W110 is demonstrated. First, an outline of the blow process will be described.

  A part of the circulating water W110 evaporates when it is cooled by the cooling tower 110. During the operation of the water treatment system 100, the cooling tower 110 repeats evaporation of the circulating water W110. For this reason, the concentration of the circulating water W110 gradually increases. When the concentration of the circulating water W110 increases, the concentration of impurities such as corrosive ions and scale generation factors contained in the circulating water W110 also increases. When the degree of concentration of the circulating water W110 becomes higher than a predetermined threshold value, there is a high possibility that obstacles such as scale adhesion and corrosion will occur in the cooled apparatus 131.

  In order to prevent this, it is necessary to constantly monitor the concentration of the circulating water W110 during operation of the water treatment system 100. Normally, the electrical conductivity increases as the concentration of the circulating water W110 increases. Therefore, the concentration of the circulating water W110 can be indirectly determined by periodically measuring the electrical conductivity EC of the circulating water W110. The blow process control unit 165 executes a blow process, which will be described later, when the concentration determination unit 164 determines that the electrical conductivity EC measured by the electrical conductivity measuring device 133 is equal to or greater than a predetermined threshold.

  In the blow process, drainage and replenishment of the circulating water W110 are performed simultaneously or continuously. When draining the circulating water W110, it is performed by one of the following methods.

(Forced drainage blow)
The blow processing control unit 165 opens the drain valve 145 and discharges a part of the circulating water W110 stored in the storage unit 116 of the cooling tower 110 from the drain line L140 to the outside. When a part of the circulating water W110 is discharged, the water level of the storage unit 116 is lowered, so that the ball tap of the water tap 144 is operated, and new makeup water W121 is replenished through the third makeup water line L123. When this forced drainage blow is performed, the replenishing water valve 143 remains in the closed state and no opening / closing operation is performed.

(Forced rehydration blow)
The blow process control unit 165 opens the makeup water valve 143 and forcibly replenishes the storage section 116 with new makeup water W121 through the second makeup water line L122. When the makeup water W121 is replenished, the water level in the storage unit 116 rises, so that the overflowing circulating water W110 is discharged from the overflow line L150 to the outside. In addition, when implementing this forced water replenishment blow, the drain valve 145 remains in a closed state, and no opening / closing operation is performed.

  The makeup water W121 that is newly replenished during the blow processing has a lower electrical conductivity than the concentrated circulation water W110, so that the electrical conductivity of the circulation water W110 can be lowered as a whole. The blow process is a normal blow process that is periodically performed during operation of the water treatment system 100. In the present embodiment, this blow process is referred to as “first blow process”.

  On the other hand, when a failure such as a failure occurs in the electrical conductivity measuring device 133 (or when a disconnection occurs with the system control device 101), the correct electrical conductivity EC is not detected and the detected value Is always zero or a fixed value. In such a case, since the blow process is not performed even though the concentration of the circulating water W110 is high, there is a possibility that a malfunction occurs in the cooled apparatus 131.

  Therefore, in the water treatment system 100 of the present embodiment, the electrical conductivity EC measured by the electrical conductivity measuring device 133 under the condition that the temperature difference between the inlet temperature TP1 and the outlet temperature TP2 of the circulating water W110 is a predetermined value or more. Is not changed by more than a predetermined value, it is determined that a failure such as a failure has occurred in the electrical conductivity measuring device 133, and intermittent blow processing is performed while the circulating water pump 132 is in operation. I have to. Such a blow process is a backup blow process performed when a failure such as a failure occurs in the electrical conductivity measuring device 133. In the present embodiment, this blow process is referred to as “second blow process”.

  Hereinafter, the operation when the circulating process of the circulating water W110 is performed will be described with reference to FIGS. FIG. 5 is a flowchart showing an overall processing procedure when the control unit 102 of the water treatment system 100 executes the blow process. FIG. 6 is a flowchart showing a processing procedure when the control unit 102 of the water treatment system 100 executes the first blow process. FIG. 7 is a flowchart illustrating a processing procedure when the control unit 102 of the water treatment system 100 executes the second blow process.

  First, an overall processing procedure when the control unit 102 of the water treatment system 100 executes a blow process will be described with reference to FIG. The process of the flowchart shown in FIG. 5 is repeatedly executed during operation of the water treatment system 100.

  In step ST201, the blow process control unit 165 determines whether or not the circulating water pump 132 is in operation and the blow process is stopped. The blow processing control unit 165 determines that the blow processing is stopped when both the makeup water valve 143 and the drain valve 145 are closed, and when either the makeup water valve 143 or the drain valve 145 is open. Determines that the blow process is being executed. In step ST201, when the blow process control unit 165 determines that the circulating water pump 132 is in operation and the blow process is stopped (YES), the process proceeds to step ST202. In step ST201, when the blow process control unit 165 determines that the circulating water pump 132 is in operation and the blow process is not stopped (NO), the process returns to step ST201 again.

  In step ST202 which shifted from step ST201 (YES determination), the blow process control unit 165 obtains the inlet temperature TP1 of the circulating water W110 from the first temperature sensor 135 and the outlet temperature TP2 of the circulating water W110 from the second temperature sensor 136. get.

  In step ST203, the blow process control unit 165 determines whether the temperature difference between the inlet temperature TP1 and the outlet temperature TP2 is equal to or greater than a predetermined value. In step ST203, when the blow process control unit 165 determines that the temperature difference between the inlet temperature TP1 and the outlet temperature TP2 is equal to or greater than a predetermined value (YES), the process proceeds to step ST204. In step ST203, when the blow process control unit 165 determines that the temperature difference between the inlet temperature TP1 and the outlet temperature TP2 is less than a predetermined value (NO), the process returns to step ST201 again.

  As described above, when the temperature difference between the inlet temperature TP1 and the outlet temperature TP2 is equal to or greater than a predetermined value, it is considered that the circulating water W110 has evaporated and the degree of concentration is high. Move to the step to do. On the other hand, when the temperature difference between the inlet temperature TP1 and the outlet temperature TP2 is less than a predetermined value, the concentration of the circulating water W110 is considered to be relatively low, and thus the process does not proceed to the step of determining the execution of the blow process. In addition, it waits until it reaches a state where the enrichment is considered to be high.

In step ST204 transferred from step ST203 (YES determination), the blow process control unit 165 obtains the electrical conductivity EC measured by the electrical conductivity measuring device 133 as the electrical conductivity EC1.
In step ST205, the blow processing control unit 165 causes the time measuring unit 161 to start measuring the third time zone T3.

  In step ST206, the blow process control unit 165 determines whether or not the time measuring unit 161 has finished measuring the third time zone T3. In step ST206, when the blow process control unit 165 determines that the time measurement in the third time zone T3 has ended (YES), the process proceeds to step ST207. If the blow process control unit 165 determines in step ST206 that the time measurement in the third time period T3 has not ended (NO), the process returns to step ST206.

  In step ST207 transferred from step ST206 (YES determination), the blow processing control unit 165 acquires the electrical conductivity EC measured by the electrical conductivity measuring device 133 as the electrical conductivity EC2.

  In step ST208, the blow process control unit 165 determines whether or not the difference between the electrical conductivities EC1 and EC2 is equal to or greater than a predetermined value (EC2−EC1 ≧ predetermined value). In step ST208, when the blow process control unit 165 determines that the difference between the electrical conductivities EC1 and EC2 is equal to or greater than a predetermined value (YES), the process proceeds to step ST209. In step ST208, when the blow process control unit 165 determines that the difference between the electrical conductivities EC1 and EC2 is less than a predetermined value (NO), the process proceeds to step ST210.

  Thus, if the difference between the electrical conductivities EC1 and EC2 is equal to or greater than a predetermined value, it is considered that the electrical conductivity measuring device 133 is operating normally reflecting the progress of concentration of the circulating water W110. The process proceeds to a step for executing a normal blow process. On the other hand, if the difference between the electrical conductivities EC1 and EC2 is less than a predetermined value, a malfunction such as a failure occurs in the electrical conductivity measuring device 133. For example, the detected value is always zero or a fixed value. Therefore, the process proceeds to the step of executing the blow process for backup.

  In step ST209 transferred from step ST208, the blow process control unit 165 executes a first blow process described later. On the other hand, in step ST210 which shifted from step ST208, the blow process control part 165 performs the 2nd blow process mentioned later.

  Next, a processing procedure when the control unit 102 of the water treatment system 100 executes the first blow process will be described with reference to FIG. The process of the flowchart shown in FIG. 6 is executed as a subroutine in step ST209 of FIG.

  In step ST301, the blow process control unit 165 determines whether or not the circulating water pump 132 is in operation. In step ST301, when the blow process control unit 165 determines that the circulating water pump 132 is in operation (YES), the process proceeds to step ST302. In step ST301, when the blow process control unit 165 determines that the circulating water pump 132 is not operating (NO), the process of this flowchart ends (returns to step ST201).

  In step ST302 transferred from step ST301 (YES determination), the blow process control unit 165 acquires the electrical conductivity EC measured by the electrical conductivity measuring device 133 as the electrical conductivity EC3.

  In step ST303, the blow process control unit 165 compares the electrical conductivity EC3 with the electrical conductivity ECth1, which is an upper limit threshold value for starting the blow process, and determines whether or not the electrical conductivity EC3 is equal to or higher than the electrical conductivity ECth1. . In step ST303, when the blow process control unit 165 determines that the electrical conductivity EC3 is equal to or higher than the electrical conductivity ECth1 (YES), the process proceeds to step ST304. If the blow process control unit 165 determines in step ST303 that the electrical conductivity EC3 is less than the electrical conductivity ECth1 (NO), the process of this flowchart ends (returns to step ST201).

  In step ST304 transferred from step ST303, the blow process control unit 165 starts the blow process (drainage and replenishment of the circulating water W110).

  In step ST305, the blow process control unit 165 determines whether or not the circulating water pump 132 is in operation. In step ST305, when the blow process control unit 165 determines that the circulating water pump 132 is in operation (YES), the process proceeds to step ST306. In Step ST305, when the blow processing control unit 165 determines that the circulating water pump 132 is not in operation (NO), the process proceeds to Step ST308.

  When the operation of the circulating water pump 132 is stopped, the circulating water W110 does not circulate. For this reason, when operation of circulating water pump 132 stops after starting blow processing, it shifts to Step ST108 and ends blow processing.

  In step ST306 transferred from step ST305, the blow process control unit 165 acquires the electrical conductivity EC measured by the electrical conductivity measuring device 133 as the electrical conductivity EC4.

  In step ST307, the blow process control unit 165 compares the electrical conductivity EC4 with the electrical conductivity ECth2, which is a lower limit threshold value for ending the blow process, and determines whether or not the electrical conductivity EC4 is less than the electrical conductivity ECth2. . In step ST307, when the blow process control unit 165 determines that the electrical conductivity EC4 is less than the electrical conductivity ECth2 (YES), the process proceeds to step ST308. If the blow process control unit 165 determines in step ST307 that the electrical conductivity EC4 is equal to or higher than the electrical conductivity ECth2 (NO), the process returns to step ST304.

Thus, when the electrical conductivity EC4 acquired after the start of the blow process is less than the electrical conductivity ECth2, it is considered that the concentration of the circulating water W110 has become sufficiently low, and the process proceeds to the step of ending the blow process. To do. On the other hand, when the electrical conductivity EC4 is equal to or higher than the electrical conductivity ECth2, it is considered that the concentration of the circulating water W110 is still high. Therefore, the process proceeds to the step of continuing the blowing process.
In step ST305 (NO determination) or step ST308 transferred from step ST307, the blow process control unit 165 ends the blow process. Thereby, the process of this flowchart is complete | finished (it returns to step ST201).

  Next, a processing procedure when the control unit 102 of the water treatment system 100 executes the second blow process will be described with reference to FIG. The process of the flowchart shown in FIG. 7 is executed as a subroutine in step ST210 of FIG.

  In step ST401, the blow process control unit 165 determines whether or not the circulating water pump 132 is in operation. In step ST401, when the blow process control unit 165 determines that the circulating water pump 132 is in operation (YES), the process proceeds to step ST402. Moreover, in step ST401, when the blow process control unit 165 determines that the circulating water pump 132 is not operating (NO), the process proceeds to step ST405.

In step ST402 transferred from step ST401 (YES determination), the blow process control unit 165 starts blow process (drainage and replenishment of the circulating water W110).
In step ST403, the blow process control unit 165 causes the time measuring unit 161 to start measuring the fourth time period T4.

  In step ST404, the blow process control unit 165 determines whether or not the time measurement in the fourth time zone T4 in the time measurement unit 161 has ended. In step ST404, when the blow process control unit 165 determines that the time measurement in the fourth time period T4 has ended (YES), the process proceeds to step ST406. If the blow process control unit 165 determines in step ST404 that the timing of the fourth time period T4 has not ended (NO), the process returns to step ST401.

On the other hand, in step ST405 shifted from step ST401 (NO determination), the blow processing control unit 165 finishes the timing and blow processing of the fourth time period T4 by the time measuring unit 161, and then the processing of this flowchart ends (step). (Return to ST201)
As described above, when the operation of the circulating water pump 132 is stopped, the circulating water W110 does not circulate. For this reason, when operation of circulating water pump 132 stops after starting blow processing, it shifts to Step ST405 and ends time-measurement and blow processing of the 4th time zone T4.

In step ST406 shifted from step ST404 (YES determination), the blow process control unit 165 ends the blow process.
In step ST407, the blow process control unit 165 determines whether or not the circulating water pump 132 is in operation. In step ST407, when the blow process control unit 165 determines that the circulating water pump 132 is in operation (YES), the process proceeds to step ST408. In step ST407, when the blow process control unit 165 determines that the circulating water pump 132 is not operating (NO), the process proceeds to step ST410.

  In step ST408, which has shifted from step ST407 (YES determination), the blow processing control unit 165 causes the time measuring unit 161 to start measuring the fifth time period T5.

  In step ST409, the blow processing control unit 165 determines whether or not the time counting in the fifth time zone T5 in the time measuring unit 161 has ended. In step ST409, when the blow process control unit 165 determines that the time measurement in the fifth time period T5 has ended (YES), the process returns to step ST401. If the blow process control unit 165 determines in step ST409 that the time measurement in the fifth time period T5 has not ended (NO), the process returns to step ST406.

  In step ST410 transferred from step ST407 (NO determination), the blow process control unit 165 ends the time measurement of the fifth time period T5 by the time measuring unit 161, and the process of this flowchart ends (returns to step ST201).

  In the second blow process for backup described above, the blow process is executed in the fourth time zone T4. In addition, in the fifth time period T5, execution of the blow process is stopped. Thus, in the second blow process, the blow process is intermittently performed until the operation of the circulating water pump 132 is stopped.

According to the water treatment system 100 of this embodiment mentioned above, there exist the following effects, for example.
When the ORP value Q0 of the circulating water W110 is less than the chemical supply start ORP value Q1, the water treatment system 100 of the present embodiment causes the chemical supply start process P1 to be executed within the first time period T1, and the first When the time period T1 has elapsed, the chemical supply stop process P2 is executed within the second time period T2, and further, the second time period T2 has elapsed and the ORP value Q0 of the circulating water W110 is equal to the chemical supply stop ORP. When the value is less than Q2, a process control unit 163 that causes the medicine supply start process P1 to be executed again within the first time period T1 is provided.

  The drug supplied to the circulating water line L110 in the drug supply start process P1 in the first time zone T1 described above diffuses to the circulating water line L110 in the drug supply stop process P2 in the second time zone T2. As a result, the effect of the supplied medicine is reflected on the ORP value of the circulating water W110 when the second time period T2 has elapsed.

  For this reason, if the ORP value Q0 is less than the medicine supply start ORP value Q1 at the time when the second time period T2 has elapsed, the medicine supply start process P1 is executed to continue the medicine supply, and the ORP value Q0 stops the medicine supply. If the ORP value is equal to or greater than Q2, by stopping the supply of the drug, it is possible to control the ORP value Q0 of the circulating water W110 to be equal to or higher than the drug supply stop ORP value Q2 while suppressing excessive supply of the drug. .

Thus, in the water treatment system 100 of the present embodiment, the chemical supply start process P1 and the chemical supply stop process P2 are alternately and repeatedly executed based on the ORP value Q0 of the circulating water W110. Even when the path of the line L110 is long, it is possible to control the ORP value Q0 of the circulating water W110 to be equal to or higher than the medicine supply stop ORP value Q2 while suppressing excessive supply of the medicine.
Therefore, according to the water treatment system 100 of the present embodiment, it is possible to suppress an excessive supply of the medicine. As a result, the drug concentration in the circulating water W110 can be maintained in an appropriate range.

  In the water treatment system 100 of the present embodiment, the process control unit 163 supplies the chemical when the ORP value Q0 of the circulating water W110 is equal to or higher than the chemical supply stop ORP value Q2 within the first time period T1. The execution of the start process P1 is stopped, and the supply of the medicine is stopped.

  As described above, even when the medicine supply start process P1 is being executed, if the ORP value Q0 of the circulating water W110 is equal to or higher than the medicine supply stop ORP value Q2, the execution of the medicine supply start process P1 is stopped. , Excessive supply of the drug can be more effectively suppressed.

  Further, in the water treatment system 100 of the present embodiment, the blow treatment control unit 165 has a difference between the inlet temperature TP1 and the outlet temperature TP2 in the cooling tower 110 of the circulating water W110 equal to or greater than a predetermined value, and the third time zone T3. When it is determined that the difference between the electrical conductivities EC1 and EC2 before and after is less than a predetermined value, a second blow process for backup is performed.

  Therefore, even when a failure such as a failure occurs in the electrical conductivity measuring device 133 and the detected electrical conductivity EC is always zero or a fixed value, the blow process can be surely performed. Therefore, the highly concentrated circulating water W110 is supplied to the cooled device 131, and it is possible to suppress the occurrence of failures such as scale adhesion and corrosion in the cooled device 131.

  As mentioned above, although preferred embodiment of this invention was described, this invention can be implemented with a various form, without being limited to embodiment mentioned above.

  In this embodiment, the example using the oxidation-reduction potential measuring device 134 that measures the oxidation-reduction potential of the circulating water W110 as the water quality detection means when the oxidized slime control agent is used as the drug has been described. Not only this but a water quality detection means is suitably selected according to the medicine supplied to circulating water W110. For example, when using a slime control agent, anticorrosive agent, scale inhibitor, etc. other than the oxidized type as a drug, the supply concentration of the drug is determined by measuring the concentration of the tracer substance mixed with the drug in the circulating water W110. It can be detected indirectly. As the tracer substance, for example, a lithium salt such as lithium chloride, a fluorescent compound such as pyrenesulfonic acid, a dye having absorption at a specific wavelength, and the like can be used. Examples of water quality detection means for detecting these tracer substances include an ion electrode type lithium ion concentration measurement device, a fluorescence intensity measurement device, and a transmitted light intensity measurement device.

  In addition, various well-known substances can be used for the slime control agent, anticorrosive agent, and scale inhibitor other than an oxidation type. Examples of slime control agents other than the oxidized type include isothiazoline compounds and carbamate compounds. Examples of the anticorrosive include silicate, zinc salt, molybdenum salt, benzotriazole derivative and the like. Furthermore, examples of the scale inhibitor include carboxylic acid polymers, acrylic acid polymers, phosphonic acid chelating agents, carboxylic acid chelating agents, and the like.

  In this embodiment, the example which supplies a chemical | medical agent from the chemical | medical agent supply apparatus 150 to the storage part 116 of the cooling tower 110 was demonstrated. However, the present invention is not limited to this, and the medicine may be directly supplied to the circulating water line L110. That is, if the drug can be finally supplied to the circulating water line L110, the positions where the drug is supplied are the cooling tower 110 (watering part 112, storage part 116) and the circulating water line L110 (circulating water supply line L111, circulation). It may be anywhere on the water recovery line L112).

In the present embodiment, when the second blow process is executed, the administrator of the water treatment system 100 may be notified by an alarm or the like that a failure such as a failure has occurred in the electrical conductivity measuring device 133. .
In this embodiment, although the example which comprised the cooling tower 110 as an open type cooling tower was shown, it does not restrict to this and you may comprise the cooling tower 110 as a closed type cooling tower.

DESCRIPTION OF SYMBOLS 100 Water treatment system 101 System control apparatus 102 Control part 103 Memory 110 Cooling tower 112 Sprinkling part 116 Storage part 131 Cooled apparatus 132 Circulating water pump 133 Electrical conductivity measuring apparatus 134 Oxidation reduction potential measuring apparatus (water quality detection means)
135 1st temperature sensor 136 2nd temperature sensor 150 chemical | medical agent supply apparatus (chemical | medical agent supply means)
161 Timekeeping section (timekeeping means)
162 Process execution unit (process execution means)
163 Process control unit (process control means)
164 Concentration determination unit 165 Blow processing control unit L110 Circulating water line L111 Circulating water supply line L112 Circulating water recovery line L120 Makeup water line L130 Chemical supply line L140 Drainage line W110 Circulating water W121 Makeup water

Claims (3)

A cooling tower for cooling the circulating water supplied to the apparatus to be cooled;
A circulating water line for circulating circulating water between the cooling tower and the cooled device;
A medicine supply means for supplying a medicine to the circulating water line;
Water quality detection means for detecting the quality of the circulating water flowing through the circulating water line;
A time counting means for timing a first time zone in which a medicine is supplied from the medicine supply means to the circulating water line and a second time zone in which a medicine is not supplied from the medicine supply means to the circulating water line;
A medicine supply start process for starting the time measurement of the first time zone by the time measuring means and supplying the medicine from the medicine supply means to the circulating water line within the first time zone; and the second time zone by the time measuring means; A process execution means for starting a time measurement and executing a medicine supply stop process for stopping the supply of the medicine from the medicine supply means to the circulating water line within a second time zone;
When the water quality of the circulating water detected by the water quality detection means is lower than the medicine supply start water quality that is the upper threshold of the quality of water for starting the supply of the medicine, the process execution means executes the medicine supply start process, and the time measuring means When the time measurement in the first time zone is completed, the chemical supply stop process is executed by the process execution means, and the circulating water detected by the water quality detection means is finished in the second time zone in the time measurement means. Process control means for causing the process execution means to execute a chemical supply start process when the water quality is lower than the chemical supply end water quality which is the lower threshold of the quality of water for stopping the supply of the chemical;
A water treatment system comprising.   When the water quality of the circulating water detected by the water quality detection unit exceeds the chemical supply end water quality during the execution of the chemical supply start process, the process control unit executes the chemical supply start process by the process execution unit. The water treatment system according to claim 1 to be stopped.   The water treatment system according to claim 1 or 2, wherein the water quality detection means is a redox potential detection device that detects a redox potential of circulating water flowing through the circulating water line.

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