JP2013188730A - Water treatment system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water treatment system capable of simplifying the system and suppressing an occurrence of scale to the utmost in a circulation system.SOLUTION: A water treatment system includes: a hard water-softening device 143 producing a softened water from a raw water; a cooling tower cooling the softened water as a circulation water and feeding the cooled circulation water to a cooled device; a makeup water line feeding the softened water produced by the hard water-softening device 143 into the cooling tower as a makeup water; a circulation water line circulating the circulation water between the cooling tower and cooled device; a regeneration control part 106 for carrying out the regeneration treatment of the hard water-softening device 143; a blowing treatment control part 105 for carrying out the blowing treatment for discharging a part of the circulation water from the cooling tower and/or the circulation water line; and a regeneration/blowing treatment control part 108 for regulating the operation of regeneration treatment by the regeneration control part 106 or operation of blowing treatment by the blowing treatment control part 105 so as not to conduct the regeneration treatment and the blowing treatment concurrently in the same period.

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”). Circulating water circulates between the cooling tower and the apparatus to be cooled through the circulating water line.

  When the circulating water is cooled by the cooling tower, a part of it evaporates and the degree of concentration (concentration ratio) increases. When the concentration of circulating water is high, corrosion and scale are likely to occur in the circulation system, so it is necessary to periodically perform a blow treatment. The blow process is a process of supplying fresh water (makeup water) from the outside to the cooling tower to dilute the circulating water and discharging a part of the circulating water from the cooling tower to the outside. During the operation of the cooling tower, the amount of circulating water gradually decreases due to evaporation and scattering, so that the replenishing water is appropriately supplied according to the water level of the cooling tower as well as in the case of the blow process.

  Soft water having a low hardness component may be used as make-up water to be replenished to the cooling tower in order to suppress the accumulation of scale inside the piping and equipment. Softened water is produced by softening raw water (hard water) in a hard water softening device.

  When the ion exchange resin used in the water softening device reaches a predetermined amount of water, the ion exchange capacity is lowered. For this reason, it is necessary to periodically perform a regeneration process for recovering the ion exchange ability of the ion exchange resin. This regeneration process is performed, for example, when the integrated flow rate of the manufactured softened water reaches a predetermined amount.

  In the water treatment system provided with one hard water softening device, the softening treatment cannot be performed during the regeneration treatment. Therefore, a system has been proposed in which a plurality of water softening devices are provided in a cooling tower that operates for 24 hours, and the softening treatment is performed by another water softening device while one water softening device performs regeneration processing. (For example, refer to Patent Document 1).

JP-A-6-15265

  In the above system, since a plurality of water softening devices can be used alternately, there is no need to temporarily interrupt the softening process for the regeneration process. However, providing a plurality of water softening devices complicates the system configuration and increases the equipment cost.

  On the other hand, in a water treatment system that performs a softening process using a single water softening device, when the cooling tower is blown during the regeneration process of the water softening device, untreated raw water with high hardness is cooled during this period. Supply to the tower. For this reason, it becomes easy to generate a scale in a circulation system.

  Accordingly, an object of the present invention is to provide a water treatment system capable of simplifying the system and suppressing the generation of scale in the circulation system as much as possible.

  The present invention provides a hard water softening device that softens raw water with an ion exchange resin bed to produce softened water, and cools the softened water produced by the hard water softening device as circulating water, and cools the circulating water to be cooled. A cooling tower that is supplied to the cooling tower, a supplementary water line that supplies softened water produced by the hard water softening device as makeup water to the cooling tower, and circulating water is circulated between the cooling tower and the device to be cooled. A circulating water line, a regeneration processing control unit for performing the regeneration processing of the ion exchange resin bed, and a blow processing control unit for performing a blowing process for discharging a part of the circulating water from the cooling tower and / or the circulating water line. And the execution of the regeneration process by the regeneration process control unit or the execution of the blow process by the blow process control unit so that the regeneration process and the blow process are not performed in parallel within the same period. A reproduction / blow process execution control unit that restrict, on water treatment system comprising a.

  Further, in the water treatment system, the regeneration / blow process execution control unit restricts execution of the blow process by the blow process control unit while the regeneration process by the regeneration process control unit is being performed, It is preferable to allow the blow process control unit to execute the blow process after the regeneration process is completed.

  In the water treatment system, the regeneration / blow process execution control unit limits execution of the regeneration process by the regeneration process control unit while the blow process by the blow process control unit is being performed, It is preferable that execution of the regeneration process by the regeneration process control unit is allowed after the blow process is completed.

  ADVANTAGE OF THE INVENTION According to this invention, while simplifying a system, the water treatment system which can suppress generation | occurrence | production of the scale in a circulation system as much as possible can be provided.

It is a schematic structure figure showing water treatment system 100 of a 1st embodiment. It is a functional block diagram concerning control of water treatment system 100 of a 1st embodiment. It is a flowchart which shows the process sequence in the case of performing a softening process and a reproduction | regeneration process in the control part 102 of 1st Embodiment. It is a flowchart which shows the process sequence in the case of performing a blow process in the control part 102 of 1st Embodiment. It is a flowchart which shows the process sequence in the case of restrict | limiting execution of blow processing in the control part 102 of 1st Embodiment. It is a flowchart which shows the process sequence in the case of performing a softening process and a reproduction | regeneration process in the control part 102 of 2nd Embodiment. It is a flowchart which shows the process sequence in the case of performing a blow process in the control part 102 of 2nd Embodiment. It is a flowchart which shows the process sequence in the case of restrict | limiting execution of reproduction | regeneration processing in the control part 102 of 2nd Embodiment.

<First Embodiment>
With reference to FIG. 1, schematic structure of the water treatment system 100 of 1st Embodiment of this invention is demonstrated. Drawing 1 is a schematic structure figure showing water treatment system 100 of a 1st embodiment. FIG. 2 is a functional block diagram relating to control of the water treatment system 100. FIG. 3 is a flowchart showing a processing procedure when the softening process and the regeneration process are executed in the makeup water control unit 105 and the regeneration control unit 106. FIG. 4 is a flowchart showing a processing procedure when the makeup water control unit 105 executes the blow processing. FIG. 5 is a flowchart showing a processing procedure when the reproduction / blow process execution control unit 108 controls the execution of the blow process.

  As shown in FIG. 1, the water treatment system 100 according to the first embodiment uses circulating water W110 (cooling water) to cool a cooled device 131 such as a heat exchanger incorporated in an air conditioner or a refrigerator. It is a circulating system. 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 according to the first embodiment includes, as main components, a cooling tower 110, a cooled device 131, an electrical conductivity measuring device 133, a hardness measuring device 134, a scale inhibitor supply device 135, and a system. And a 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 transmitted 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 transmitted from the system control device 101. An upstream end portion of the measurement line L113 is connected to the connection portion J112 of the circulating water supply line L111.

  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 to-be-cooled device 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 electrical conductivity of the circulating water W110 is used when determining whether or not to perform a blow process (described later) in the makeup water control unit 105 (see FIG. 2).

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

  The hardness measuring device 134 is electrically connected to the system control device 101. Information on the hardness H measured by the hardness measuring device 134 is transmitted to the system control device 101 as a detection signal. The hardness measuring device 134 measures the hardness H at a predetermined time interval (or real time) and transmits it to the system control device 101. The hardness H of the circulating water W110 is used when the water quality control unit 107 (see FIG. 2) determines whether or not to supply the scale inhibitor to the storage unit 116 of the cooling tower 110.

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

  The scale inhibitor supply device 135 is a device that supplies the scale inhibitor to the storage unit 116 of the cooling tower 110. The scale inhibitor supply device 135 is connected to the storage unit 116 of the cooling tower 110 via the scale inhibitor supply line L140. The scale inhibitor is a chemical used to prevent scale growth in water or scale deposition on a pipe surface or the like. Examples of the scale inhibitor usable here include carboxylic acid polymers, acrylic acid polymers, phosphonic acid chelating agents, carboxylic acid chelating agents, and the like.

  The scale inhibitor supply device 135 is electrically connected to the system control device 101. The timing and supply amount of the scale inhibitor supplied from the scale inhibitor supply device 135 to the storage unit 116 are controlled by a drive signal transmitted from the system control device 101.

  On the other hand, a makeup water line L120 is connected to the cooling tower 110. The makeup water line L120 is a line for replenishing makeup water to the storage section 116 of the cooling tower 110. The makeup water line L120 includes a first makeup water line L121, a second makeup water line L122, a third makeup water line L123, a fourth makeup water line L124, a fifth makeup water line L125, and a sixth makeup water. A line L126.

  The downstream side of the first makeup water line L121 branches to the second makeup water line L122 and the fifth makeup water line L125 at the branch portion J121. The downstream side of the second makeup water line L122 and the fifth makeup water line L125 is connected to the upstream side of the third makeup water line L123 at the gathering portion J122. The downstream side of the third make-up water line L123 branches to a fourth make-up water line L124 and a sixth make-up water line L126 at the branch portion J123. The downstream end portions of the fourth makeup water line L124 and the sixth makeup water line L126 are connected to the tower body 111 of the cooling tower 110, respectively.

  The upstream side of the first makeup water line L121 is connected to a supply source (not shown) of raw water W120 such as tap water or industrial water. 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 second makeup water line L122, the fifth makeup water line L125, and the sixth makeup water line L126 are provided with a water softening device 143, a bypass valve 144, and a makeup water valve 145, respectively.

  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 transmitted from the system control device 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 transmitted from the system control device 101.

  The hard water softening device 143 is a device that softens raw water (hard water) W120 to produce softened water W121. The water softening device 143 can reduce the hardness component contained in the raw water W120, specifically, calcium ions and magnesium ions, and produce the softened water W121.

  The water softening device 143 is not particularly limited as long as the water softening device 143 requires a regeneration treatment when the removal ability of the softening treatment material decreases. As the water softening device 143, a cation exchange device that performs a softening process by performing ion exchange using a single bed made of a cation exchange resin is particularly preferable. Moreover, the ion exchange apparatus which performs a deionization process can also be applied by performing ion exchange using the mixed bed which consists of a cation exchange resin and an anion exchange resin.

  The water softening device 143 includes a pressure tank as a cation exchange resin bed tower and a process control valve (all not shown). The process control valve has a plurality of valves (not shown) for switching an internal flow path.

  The process control valve is electrically connected to the system controller 101. Opening and closing of each valve in the process control valve is controlled by a drive signal transmitted from the system control device 101. The system control device 101 can switch the internal flow path by controlling the opening and closing of each valve in the process control valve. The system control apparatus 101 can execute either the softening process or the regeneration process (regeneration process) by switching the flow path inside the process control valve.

  The softening process is a process for producing the softened water W121 by passing the raw water W120 through a pressure tank. The regeneration treatment is a process for recovering the ion exchange ability of the cation exchange resin bed column by circulating a regeneration solution (for example, sodium chloride aqueous solution) or the like through the pressure tank.

  Moreover, the hard water softening apparatus 143 measures the integrated flow volume (namely, water sampling amount) of the softened water W121 manufactured by the softening process with the flow meter (not shown) provided in the inside. Then, the hard water softening device 143 transmits a regeneration request signal to the system control device 101 (control unit 102) when the integrated flow rate of the manufactured softened water W121 reaches a predetermined amount. Further, the water softening device 143 transmits the end of the regeneration process to the system control device 101 (control unit 102) as a regeneration end signal.

  The bypass valve 144 is softened via the second make-up water line L122 by closing the fifth make-up water line L125 (that is, passing water through the hard-water softening device 143) when the softening process of the water softening device 143 is performed. This is a water supply facility for supplying water W121 toward the third makeup water line L123. Further, the bypass valve 144 opens the fifth make-up water line L125 (that is, bypasses the hard-water softening device 143) when the regeneration process of the hard water softening device 143 is executed, and thereby passes through the fifth make-up water line L125. This is a water supply facility that supplies raw water W120 toward the third makeup water line L123. The bypass valve 144 is electrically connected to the system control device 101. The opening and closing of the valve body in the bypass valve 144 is controlled by a drive signal from the system control device 101.

  The makeup water valve 145 is a water supply facility that forcibly supplies the raw water W120 or the softened water W121 as makeup water to the reservoir 116 by opening and closing the sixth makeup water line L126. The makeup water valve 145 is electrically connected to the system control device 101. The opening and closing of the valve body in the makeup water valve 145 is controlled by a drive signal from the system control device 101.

  A water faucet 146 is provided at the downstream end of the fourth makeup water line L124. The water tap 146 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 146, the ball tap is activated and the raw water W120 or softened water W121 flowing through the fourth makeup water line L124 is supplied to the storage unit 116 as makeup water. Is done.

  With the configuration of the makeup water line L120, when the bypass valve 144 is set in the closed state and the softening process of the hard water softening device 143 is being performed, the second makeup water line L122 and the third makeup water line L123. The fourth makeup water line L124 and the sixth makeup water line L126 function as a softened water makeup water line. On the other hand, when the bypass valve 144 is set to the open state and the regeneration process of the water softening device 143 is being executed, the fifth makeup water line L125, the third makeup water line L123, the fourth makeup water line L124, and The sixth makeup water line L126 functions as a raw water makeup water line.

  The drain line L130 is connected to the bottom of the storage part 116 and extends downward. The drainage line L130 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 a blow process described later. A drain valve 147 is connected in the middle of the drain line L130. The drain valve 147 can open and close the drain line L130. The drain valve 147 is electrically connected to the system controller 101. The opening and closing of the valve body in the drain valve 147 is controlled by a drive signal transmitted from the system control device 101.

  Further, an overflow line L150 is connected to the cooling tower 110. The overflow line L150 opens the replenishing water valve 145 and forcibly supplies the raw water W120 or the softened water W121 to the circulating water W110 that overflows from the storage unit 116 of the cooling tower 110. It is a line that discharges to That is, the overflow line L150 is configured to control the replenishing water valve 145 in place of the opening / closing control of the drain valve 147 in the blow processing described later, thereby allowing the circulating water W110 stored in the storage unit 116 of the cooling tower 110 to It functions as a line forcibly discharging out of the water treatment system 100.

  Next, with reference to FIG. 2, the function which concerns on control of the water treatment system 100 of 1st Embodiment is demonstrated.

  The system control apparatus 101 controls the operation of each unit in the water treatment system 100 of the first embodiment. As shown in FIG. 2, the system controller 101 includes, for example, a fan drive unit 122, a circulating water pump 132, a raw water pump 141, a bypass valve 144, a makeup water valve 145, a drain valve 147, a hard water softening device 143, and a scale inhibitor. It is electrically connected to the supply device 135.

  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 information on the electrical conductivity of the circulating water W110 measured by the electrical conductivity measuring device 133 as an electrical conductivity detection signal. The system control device 101 is electrically connected to the hardness measuring device 134 and receives information on the hardness of the circulating water W110 measured by the hardness measuring device 134 as a hardness detection signal.

  In the system control apparatus 101, the received electrical conductivity and hardness are stored in the memory 103 (described later). Further, the electrical conductivity and hardness are sequentially updated to the latest values at a predetermined time interval (or real time).

  The system control apparatus 101 includes a control unit 102 and a memory 103. Further, the control unit 102 includes a concentration determination unit 104, a makeup water control unit 105 serving as a blow process control unit, a regeneration control unit 106 serving as a regeneration process control unit, a water quality control unit 107, and a regeneration / blow process execution control unit 108. Is provided.

  The concentration determination unit 104 determines whether or not the electrical conductivity EC of the circulating water W110 measured by the electrical conductivity measuring device 133 is equal to or greater than the first threshold EC1. As the first threshold EC1, for example, an upper limit electric conductivity that can ensure suppression of generation of scale and slime in the circulation system is set. Further, the concentration determination unit 104 determines whether or not the electrical conductivity EC of the circulating water W110 measured by the electrical conductivity measuring device 133 is less than the second threshold value EC2. As the second threshold value EC2, for example, a lower limit electric conductivity that can ensure suppression of corrosion in the circulation system is set. The enrichment determination unit 104 transmits the determination result to the control unit 102.

  In the present embodiment, when the electrical conductivity EC of the circulating water W110 is equal to or higher than the first threshold value EC1, the blow processing of the cooling tower 110 is started. Further, when the electrical conductivity EC of the circulating water W110 becomes less than the second threshold value EC2, the blow processing of the cooling tower 110 is finished. Therefore, even when the electrical conductivity EC of the circulating water W110 is less than the first threshold EC1, if the electrical conductivity EC of the circulating water W110 is greater than or equal to the second threshold EC2, the cooling tower 110 blow process is continued. The

  When the concentration determination unit 104 determines that the electrical conductivity of the circulating water W110 is equal to or higher than the first threshold value EC1, the makeup water control unit 105 performs the blow process because the concentration of the circulating water W110 is high. By doing so, either the raw | natural water W120 or the softened water W121 is replenished to the storage part 116 as make-up water.

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

(Forced drainage blow)
The makeup water control unit 105 opens the drain valve 147 to discharge a part of the circulating water W110 stored in the storage unit 116 of the cooling tower 110 from the drain line L130 to the outside. When a part of the circulating water W110 is discharged, the water level in the storage unit 116 is lowered, so that the ball tap of the water tap 146 is operated, and new makeup water is replenished through the fourth makeup water line L124. When this forced drainage blow is performed, the replenishment water valve 145 remains closed and no opening / closing operation is performed.

(Forced rehydration blow)
The makeup water control unit 105 opens the makeup water valve 145 and forcibly replenishes the storage unit 116 with new makeup water through the sixth makeup water line L126. When the makeup water is replenished, the water level of the storage unit 116 rises, and thus the overflowing circulating water W110 is discharged from the overflow line L150 to the outside. Note that when this forced water replenishment blow is performed, the drain valve 147 remains in the closed state, and the opening / closing operation is not performed.

  In the normal operation (during the softening process) of the hard water softening device 143, the makeup water control unit 105 closes the bypass valve 144 and supplies the makeup water with the softened water makeup water line (that is, the supplementary water line). , A second makeup water line L122, a third makeup water line L123, a fourth makeup water line L124, and a sixth makeup water line L126) are set. Then, the makeup water control unit 105 determines that the electrical conductivity EC of the circulating water W110 is equal to or higher than the first threshold EC by the concentration determination unit 104, and sends a blow process permission signal from the regeneration / blow process execution control unit 108. If received, the replenishment water valve 145 or the drain valve 147 is controlled to replenish the reservoir 116 with the softened water W121 as make-up water (blow process start). The operation for executing the blow process in the makeup water control unit 105 will be described later.

  Thereafter, the makeup water control unit 105 determines that the electrical conductivity EC of the circulating water W110 is less than the second threshold value EC2 (concentration of the circulating water W110 is low; EC1> EC2) by the concentration determination unit 104. The supply water valve 145 or the drain valve 147 is controlled to stop the supply of the raw water W120 or the softened water W121 to the reservoir 116 (end of the blow process). As a result, the concentration of the circulating water W110 in the storage unit 116 is reduced.

  By receiving the regeneration request signal from the water softening device 143, the regeneration control unit 106 detects a time period during which the raw water W120 is supplied to the storage unit 116 as makeup water, that is, a time period during which regeneration processing is performed. When the regeneration control unit 106 receives the regeneration request signal from the water softening device 143, the regeneration control unit 106 transmits a drive signal for valve control to the process control valve of the water softening device 143 to control opening and closing of a predetermined valve. Thereby, in the process control valve, the internal flow path is switched to the flow path for the regeneration process. Thereafter, the regeneration control unit 106 starts the regeneration process by circulating the regeneration solution or the like through the pressure tank of the water softening device 143. The operation in the case where the reproduction control unit 106 executes the softening process and the reproduction process will be described later.

  In addition, the regeneration control unit 106 receives a regeneration end signal from the water softening device 143, thereby detecting a time zone in which the softened water W121 is supplied to the storage unit 116 as makeup water, that is, a time zone in which the softening process is performed. . When the regeneration control unit 106 receives the regeneration end signal from the water softening device 143, the regeneration control unit 106 transmits a drive signal to the process control valve of the water softening device 143 to control opening and closing of a predetermined valve. Thereby, in the process control valve, the internal flow path is switched to the flow path for the softening process. Thereafter, the regeneration control unit 106 starts the softening process by circulating the raw water W120 through the pressure tank of the hard water softening device 143.

  When the regeneration control unit 106 receives the regeneration request signal from the water softening device 143, that is, when the regeneration control unit 106 detects a time zone in which the regeneration process is performed, the water quality control unit 107 performs scale prevention. A drive signal is transmitted to the agent supply device 135 to cause the storage unit 116 to supply the scale inhibitor. In the present embodiment, the scale inhibitor is supplied to the circulating water W110 in proportion to the replenishment amount of the raw water W120 until the regeneration process is completed. Specifically, for example, an instantaneous flow meter is provided in the third makeup water line L123, and an amount of scale inhibitor proportional to the detected instantaneous flow rate of the raw water W120 is supplied in synchronization with the replenishment of the raw water W120. be able to. Further, for example, an integrated flow meter is provided in the third makeup water line L123, and an amount of scale inhibitor proportional to the integrated flow rate of the raw water W120 during the regeneration process is supplied all at once at the end of the regeneration process. You can also.

  Furthermore, in this embodiment, the scale inhibitor can be supplied to the circulating water W110 in proportion to the replenishment time of the raw water W120 until the regeneration process is completed. In addition, when supplying the scale inhibitor in proportion to the replenishment time of the raw water W120, it may be supplied continuously during the regeneration process, or may be supplied intermittently at a predetermined interval. In addition, an amount of the scale inhibitor that is proportional to the replenishment time of the raw water W120 during the regeneration process may be supplied all at once at the end of the regeneration process.

  The regeneration / blow process execution control unit 108 limits the execution of the blow process by the makeup water control unit 105 so that the regeneration process and the blow process are not performed in parallel within the same period. Specifically, the regeneration / blow process execution control unit 108 stops transmission of the blow process permission signal to the makeup water control unit 105 while the regeneration process by the regeneration control unit 106 is being performed, The execution of the blow processing by the water control unit 105 is restricted. In addition, after the regeneration process is completed, the regeneration / blow process execution control unit 108 transmits a blow process permission signal to the makeup water control unit 105 to allow the makeup water control unit 105 to execute the blow process. The operation when the reproduction / blow process execution control unit 108 restricts the execution of the blow process will be described later.

  The memory 103 stores a control program and various data necessary for controlling the water treatment system 100. Specifically, the memory 103 includes a control program for operating various functions necessary for controlling the water treatment system 100, the electrical conductivity measured by the electrical conductivity measuring device 133, and the hardness measured by the hardness measuring device 134. Various threshold values, various calculated values, and the like are stored in predetermined storage areas assigned thereto.

  Next, the operation when the softening process and the regeneration process are executed in the control unit 102 of the water treatment system 100 will be described with reference to FIG. The processing of the flowchart shown in FIG. 3 is executed by the makeup water control unit 105 and the regeneration control unit 106 of the control unit 102 based on the control program stored in the memory 103.

  In step ST101 shown in FIG. 3, the regeneration control unit 106 transmits a drive signal for valve control to the process control valve of the water softening device 143, and switches the inside of the process control valve to a flow path for softening processing. Run the action. The regeneration process is stopped by switching the flow path of the process control valve to the flow path for the softening process.

  In step ST102, the makeup water control unit 105 controls the bypass valve 144 to be in a closed state, and sets a softened water makeup water line as a line for supplying makeup water to the storage unit 116.

  In step ST103, the regeneration control unit 106 determines whether or not a regeneration request signal has been received from the water softening device 143. In step ST103, when the reproduction control unit 106 determines that the reproduction request signal has been received (YES), the process proceeds to step ST104. In step ST103, if the reproduction control unit 106 determines that the reproduction request signal has not been received (NO), the process returns to step ST103.

  In step ST104 (step ST103: YES), the makeup water control unit 105 controls the bypass valve 144 to an open state, and sets a raw water makeup water line as a line for supplying makeup water to the storage unit 116.

  In step ST105, the regeneration control unit 106 transmits a drive signal for valve control to the process control valve of the water softening device 143 to execute an operation of switching the inside of the process control valve to a flow path for regeneration processing. . The softening process is stopped by switching the flow path of the process control valve to the flow path for the regeneration process.

  In step ST106, the regeneration control unit 106 starts the regeneration process by transmitting a drive signal for the regeneration process to the process control valve of the water softening device 143 and circulating the regeneration liquid or the like through the pressure tank.

  In step ST107, the regeneration control unit 106 determines whether or not a regeneration end signal has been received from the water softening device 143. In step ST107, when the reproduction control unit 106 determines that a reproduction end signal has been received (YES), the processing of this flowchart ends (returns to step ST101). In step ST107, when the reproduction control unit 106 determines that the reproduction end signal has not been received (NO), the process returns to step ST107. In step ST107, the reproduction process is continued until the reproduction control unit 106 determines that the reproduction end signal has been received (YES).

  Next, the operation in the case of performing the blow process in the control unit 102 of the water treatment system 100 will be described with reference to FIG. The process of the flowchart shown in FIG. 4 is executed by the concentration determination unit 104 and the makeup water control unit 105 of the control unit 102 based on the control program stored in the memory 103.

  In step ST201 shown in FIG. 4, the concentration determination unit 104 determines whether or not the electrical conductivity EC of the circulating water W110 is greater than or equal to the first threshold EC1. In this step ST201, when the concentration determination unit 104 determines that the electrical conductivity EC of the circulating water W110 is equal to or higher than the first threshold EC1 (YES), the concentration of the circulating water W110 has reached the upper limit. The process proceeds to step ST202.

  In Step ST201, when the concentration determination unit 104 determines that the electrical conductivity EC of the circulating water W110 is less than the first threshold EC1 (NO), the concentration of the circulating water W110 reaches the upper limit. Therefore, the process returns to step ST201. In step ST201, the blow process is stopped until it is determined that the electrical conductivity EC of the circulating water W110 is equal to or higher than the first threshold value EC1 (YES).

  In step ST202 (step ST201: YES), the makeup water control unit 105 determines whether or not a blow process permission signal has been received from the regeneration / blow process execution control unit 108. If it is determined in step ST202 that the makeup water control unit 105 has received a blow process permission signal from the regeneration / blow process execution control unit 108 (YES), the process proceeds to step ST203. In Step ST202, when the makeup water control unit 105 determines that the blow process permission signal has not been received from the regeneration / blow process execution control unit 108 (NO), the process returns to Step ST202.

  In step ST202, when the blow processing permission signal is not received from the regeneration / blowing process execution control unit 108, the water softening device 143 performs the regeneration process. For this reason, the makeup water control unit 105 does not blow the cooling tower 110 until it receives a blow process permission signal from the regeneration / blow process execution control unit 108 even when the electrical conductivity EC of the circulating water W110 is equal to or higher than the first threshold EC1. Do not execute processing.

  In step ST203 (step ST202: YES), the makeup water control unit 105 transmits a drive signal for valve control to the makeup water valve 145 or the drain valve 147, and supplies the softened water W121 to the storage unit 116 as makeup water. Let That is, the makeup water control unit 105 starts the blowing process of the circulating water W110.

  In step ST204 (step ST201: NO), the concentration determination unit 104 determines whether or not the electrical conductivity EC of the circulating water W110 is less than the second threshold EC2. In this step ST204, when the concentration determination unit 104 determines that the electrical conductivity EC of the circulating water W110 is less than the second threshold EC2 (YES), the concentration of the circulating water W110 has decreased, so Moves to step ST205.

  In step ST204, when the concentration determination unit 104 determines that the electrical conductivity EC of the circulating water W110 is equal to or higher than the second threshold value EC2 (NO), the concentration of the circulating water W110 has decreased. Therefore, the process returns to step ST204. In step ST204, the blowing process is continued until it is determined that the electrical conductivity EC of the circulating water W110 is less than the second threshold value EC2 (YES).

  In step ST205 (step ST204: YES), the makeup water control unit 105 transmits a drive signal for valve control to the makeup water valve 145 or the drain valve 147 to stop the supply of the softened water W121 to the storage unit 116. Let That is, the makeup water control unit 105 ends the blowing process of the circulating water W110. Thereby, the process of this flowchart is complete | finished (it returns to step ST201).

  Next, the operation when the execution of the blow process is restricted in the control unit 102 of the water treatment system 100 will be described with reference to FIG. The processing of the flowchart shown in FIG. 5 is executed by the reproduction / blow process execution control unit 108 of the control unit 102 based on the control program stored in the memory 103.

  In step ST301 shown in FIG. 5, the regeneration / blow process execution control unit 108 determines whether or not a regeneration request signal has been received from the water softening device 143. In step ST301, when the reproduction / blow process execution control unit 108 determines that the reproduction request signal has been received (YES), the process proceeds to step ST302. In step ST301, when the reproduction / blow process execution control unit 108 determines that the reproduction request signal has not been received (NO), the process proceeds to step ST304.

  In step ST302 (step ST301: YES), the regeneration / blow process execution control unit 108 stops transmission of the blow process permission signal to the makeup water control unit 105. That is, when the regeneration process is performed in the water softening device 143, the regeneration / blow process execution control unit 108 performs the blow process to the makeup water control unit 105 so that the blow process is not performed in the cooling tower 110. Stop sending permission signals.

  Note that when the regeneration / blow process execution control unit 108 stops transmitting the blow process permission signal to the makeup water control unit 105, the blow process of the cooling tower 110 may be in progress. In that case, even if the regeneration / blow process execution control unit 108 stops transmitting the blow process permission signal to the makeup water control unit 105, the blow process of the cooling tower 110 continues without interruption. Executed.

  In step ST303, the regeneration / blow process execution control unit 108 determines whether or not a regeneration end signal has been received from the water softening device 143. If the playback / blow process execution control unit 108 determines in step ST303 that a playback end signal has been received (YES), the process proceeds to step ST304. If the reproduction / blow process execution control unit 108 determines in step ST303 that a reproduction end signal has not been received (NO), the process returns to step ST303.

  In step ST304 (step ST303: YES, step ST301: NO), the regeneration / blow process execution control unit 108 transmits a blow process permission signal to the makeup water control unit 105. That is, when the regeneration process is completed in the water softening device 143, the regeneration / blow process execution control unit 108 permits the supply process control unit 105 to perform the blow process so that the blow process is performed in the cooling tower 110. Send a signal. Thereby, the process of this flowchart is complete | finished (it returns to step ST301).

  According to the water treatment system 100 of 1st Embodiment mentioned above, the following effects are show | played, for example.

  In the water treatment system 100 of the first embodiment, the regeneration / blow process execution control unit 108 limits the execution of the blow process by the makeup water control unit 105 while the regeneration process by the regeneration control unit 106 is being performed, After completion of the regeneration process, the supply water control unit 105 is allowed to execute the blow process.

  According to this, the blowing process of the cooling tower 110 is not executed during the regeneration process of the water softening device 143, and the raw water W1 having high hardness is not supplied to the cooling tower 110 more than usual. Therefore, in the water treatment system 100, generation | occurrence | production of the scale in a circulation system can be suppressed as much as possible. Further, when the cooling tower 110 is operated for 24 hours, the water softening device 143 can be made one. Therefore, in the water treatment system 100, the system can be simplified and the equipment cost can be reduced.

Second Embodiment
Next, a second embodiment of the present invention will be described. The overall configuration of the water treatment system 100A of the second embodiment of the present invention is the same as the water treatment system 100 of the first embodiment. Therefore, the configuration of the water treatment system 100A will be described with reference to FIGS. 1 and 2 as in the first embodiment. In FIG.1 and FIG.2, the structural element provided with the characteristic of 2nd Embodiment is attached | subjected with "A" after a code | symbol. In the second embodiment, differences from the first embodiment will be mainly described. In that case, the same parts as those in the first embodiment will be described using the same reference numerals.

  The water treatment system 100A of the second embodiment differs from the first embodiment in the functions of the makeup water control unit 105A, the regeneration control unit 106A, and the regeneration / blow process execution control unit 108A (all of which are shown in FIG. 2) in the control unit 102. . Since other functions in the other control unit 102 are the same as those in the first embodiment, the description thereof is omitted.

  In the second embodiment, the makeup water control unit 105 </ b> A is a softened water line that supplies the makeup water to the storage unit 116 by closing the bypass valve 144 during normal operation of the water softening device 143 (during the softening process). A makeup water line (that is, a second makeup water line L122, a third makeup water line L123, a fourth makeup water line L124, and a sixth makeup water line L126) is set. Then, the makeup water control unit 105A controls the makeup water valve 145 or the drain valve 147 when the concentration determination unit 104 determines that the electrical conductivity EC of the circulating water W110 is equal to or greater than the first threshold value EC1. Thus, the softening water W121 is replenished to the storage unit 116 as makeup water. Other functions of the makeup water control unit 105A are the same as those of the makeup water control unit 105 of the first embodiment. In the makeup water control unit 105A, an operation when the blow process is executed will be described later.

  When the regeneration control unit 106A receives the regeneration request signal from the water softening device 143 and the regeneration / blow process execution control unit 108A, the regeneration control unit 106A supplies the raw water W120 to the storage unit 116 as makeup water. A time zone during which the playback process is executed is detected. When the regeneration control unit 106A receives the regeneration request signal from the water softening device 143 and also receives the regeneration processing permission signal from the regeneration / blow processing execution control unit 108A, the regeneration control unit 106A uses the process control valve of the water softening device 143 for valve control. A drive signal is transmitted to control opening and closing of a predetermined valve. Thereby, in the process control valve, the internal flow path is switched to the flow path for the regeneration process. Thereafter, the regeneration control unit 106A starts the regeneration process by circulating the regeneration solution or the like through the pressure tank of the water softening device 143. Operations in the case where the reproduction control unit 106A executes the softening process and the reproduction process will be described later.

  The reproduction / blow process execution control unit 108A in the second embodiment limits the execution of the reproduction process by the reproduction control unit 106A so that the reproduction process and the blow process are not executed in parallel within the same period. Specifically, the regeneration / blow process execution control unit 108A stops transmission of the regeneration process permission signal to the regeneration control unit 106A and performs regeneration while the blow process by the makeup water control unit 105A is being performed. Execution of reproduction processing by the control unit 106A is restricted. Further, the reproduction / blow process execution control unit 108A transmits a reproduction permission signal to the reproduction control unit 106A after the completion of the blow process, and allows the reproduction control unit 106A to execute the reproduction process. The operation when the reproduction / blow process execution control unit 108A restricts the execution of the reproduction process will be described later.

  Next, the operation when the softening process and the regeneration process are executed in the control unit 102 of the water treatment system 100A will be described with reference to FIG. The process of the flowchart shown in FIG. 6 is executed by the makeup water controller 105A and the regeneration controller 106A of the controller 102 based on the control program stored in the memory 103.

  In step ST401 shown in FIG. 6, the regeneration control unit 106A transmits a drive signal for valve control to the process control valve of the water softening device 143 to switch the inside of the process control valve to a flow path for softening processing. Run the action. The regeneration process is stopped by switching the flow path of the process control valve to the flow path for the softening process.

  In step ST402, the makeup water control unit 105A controls the bypass valve 144 to a closed state, and sets a softened water makeup water line as a line for supplying makeup water to the storage unit 116.

  In step ST403, the regeneration control unit 106A determines whether or not a regeneration request signal has been received from the water softening device 143. In step ST403, when the reproduction control unit 106A determines that the reproduction request signal has been received (YES), the process proceeds to step ST404. If the playback control unit 106A determines in step ST403 that the playback request signal has not been received (NO), the process returns to step ST403.

  In step ST404 (step ST403: YES), the reproduction control unit 106A determines whether or not a reproduction process permission signal has been received from the reproduction / blow process execution control unit 108A. If it is determined in step ST404 that the reproduction control unit 106A has received a reproduction process permission signal from the reproduction / blow process execution control unit 108A (YES), the process proceeds to step ST405. In step ST404, when it is determined by the playback control unit 106A that the playback processing permission signal has not been received from the playback / blow processing execution control unit 108A (NO), the process returns to step ST404.

  In step ST404, when the regeneration process permission signal is not received from the regeneration / blow process execution control unit 108, the blow process is performed in the cooling tower 110. Therefore, even when the regeneration control unit 106A receives the regeneration request signal from the water softening device 143, the regeneration control unit 106A does not execute the regeneration process of the water softening device 143 until it receives the regeneration process permission signal from the regeneration / blow process execution control unit 108. .

  In step ST405 (step ST404: YES), the makeup water control unit 105A controls the bypass valve 144 to an open state, and sets a raw water makeup water line as a line for supplying makeup water to the storage unit 116.

  In step ST406, the regeneration control unit 106A transmits a drive signal for valve control to the process control valve of the water softening device 143 to execute an operation of switching the inside of the process control valve to a flow path for regeneration processing. . The softening process is stopped by switching the flow path of the process control valve to the flow path for the regeneration process.

  In step ST407, the regeneration control unit 106A transmits a drive signal for regeneration processing to the process control valve of the water softening device 143, and causes regeneration fluid to flow through the pressure tank, thereby starting regeneration processing.

  In step ST408, the regeneration control unit 106A determines whether or not a regeneration end signal has been received from the water softening device 143. In step ST408, when the reproduction control unit 106A determines that a reproduction end signal has been received (YES), the processing of this flowchart ends (returns to step ST401). Also, in step ST408, when reproduction control unit 106A determines that a reproduction end signal has not been received (NO), the process returns to step ST408. In step ST408, the reproduction control unit 106A continues the reproduction process until it is determined that a reproduction end signal has been received (YES).

  Next, the operation in the case of performing the blow process in the control unit 102 of the water treatment system 100A will be described with reference to FIG. The process of the flowchart shown in FIG. 7 is executed by the concentration determination unit 104 and the makeup water control unit 105A of the control unit 102 based on the control program stored in the memory 103.

  In step ST501 shown in FIG. 7, the concentration determination unit 104 determines whether or not the electrical conductivity EC of the circulating water W110 is equal to or higher than the first threshold EC1. In step ST501, when the concentration determination unit 104 determines that the electrical conductivity EC of the circulating water W110 is equal to or higher than the first threshold EC1 (YES), the concentration of the circulating water W110 has reached the upper limit. The process moves to step ST502.

  In Step ST501, when the concentration determination unit 104 determines that the electrical conductivity EC of the circulating water W110 is less than or equal to the first threshold EC1 (NO), the concentration of the circulating water W110 is set to the upper limit. Since it has not reached, the process returns to step ST501. In step ST501, the blowing process is stopped until it is determined that the electrical conductivity EC of the circulating water W110 is equal to or higher than the first threshold value EC1 (YES).

  In step ST502 (step ST501: YES), the makeup water control unit 105A transmits a drive signal for valve control to the makeup water valve 145 or the drain valve 147, and replenishes the softening water W121 to the storage unit 116 as makeup water. Let That is, makeup water control part 105A starts the blow processing of circulating water W110.

  In step ST503, the concentration determination unit 104 determines whether or not the electrical conductivity EC of the circulating water W110 is less than the second threshold EC2. In step ST503, when the concentration determination unit 104 determines that the electrical conductivity EC of the circulating water W110 is less than the second threshold value EC2 (YES), the concentration of the circulating water W110 has decreased, and thus the processing is performed. Moves to step ST504.

  In Step ST503, when the concentration determination unit 104 determines that the electrical conductivity EC of the circulating water W110 is equal to or higher than the second threshold EC2 (NO), the concentration of the circulating water W110 has decreased. Therefore, the process returns to step ST503. In step ST503, the blowing process is continued until it is determined that the electrical conductivity EC of the circulating water W110 is less than the second threshold value EC2 (YES).

  In step ST504 (step ST503: YES), the makeup water control unit 105A transmits a drive signal for valve control to the makeup water valve 145 or the drain valve 147, and stops the supply of the softened water W121 to the storage unit 116. Let That is, the makeup water control unit 105A ends the blowing process of the circulating water W110. Thereby, the process of this flowchart is complete | finished (it returns to step ST501).

  Next, the operation in the case of restricting the execution of the regeneration process in the control unit 102 of the water treatment system 100A will be described with reference to FIG. The process of the flowchart shown in FIG. 8 is executed by the reproduction / blow process execution control unit 108A of the control unit 102 based on the control program stored in the memory 103.

  In step ST601 shown in FIG. 8, the regeneration / blow process execution control unit 108A determines whether or not the electrical conductivity EC of the circulating water W110 is equal to or higher than the first threshold EC1. Reproduction / blow process execution control unit 108A determines step ST601 based on the determination result in enrichment determination unit 104. In step ST601, when the regeneration / blow process execution control unit 108A determines that the electrical conductivity EC of the circulating water W110 is equal to or higher than the first threshold value EC1 (YES), the blow process is executed in the cooling tower 110. Therefore, the process proceeds to step ST602.

  In Step ST601, when the regeneration / blow process execution control unit 108A determines that the electrical conductivity EC of the circulating water W110 is less than the first threshold EC1 (NO), the process returns to Step ST601. And in step ST601, transmission of the regeneration process permission signal is continued until it is determined that the electrical conductivity EC of the circulating water W110 is equal to or higher than the first threshold value EC1 (YES).

  In step ST602 (step ST601: YES), the reproduction / blow process execution control unit 108A stops transmission of the reproduction process permission signal to the reproduction control unit 106. When the blow process is executed in the cooling tower 110, the regeneration / blow process execution control unit 108A notifies the regeneration control unit 106 of the regeneration process permission signal so that the regeneration process is not executed in the water softening device 143. Stop sending

  It should be noted that the regeneration process of the water softening device 143 may be executed when the regeneration / blow process execution control unit 108A stops transmitting the regeneration process permission signal to the regeneration control unit 106A. In that case, even if the regeneration / blow process execution control unit 108A stops transmitting the regeneration process permission signal to the regeneration control unit 106A, the regeneration process of the water softening device 143 continues without interruption. Executed.

  In step ST603, the regeneration / blow process execution control unit 108A determines whether or not the electrical conductivity EC of the circulating water W110 is less than the second threshold EC2. Reproduction / blow process execution control unit 108A determines step ST603 based on the determination result in enrichment determination unit 104. In this step ST603, when the regeneration / blow process execution control unit 108A determines that the electrical conductivity EC of the circulating water W110 is less than the second threshold EC2 (YES), the concentration of the circulating water W110 decreases. Therefore, the blow process ends. For this reason, a process transfers to step ST604.

  In Step ST603, when the regeneration / blow process execution control unit 108A determines that the electrical conductivity EC of the circulating water W110 is equal to or higher than the second threshold EC2 (NO), the concentration of the circulating water W110 is increased. Since it has not decreased, the blowing process is continued. For this reason, a process returns to step ST603.

  In step ST604 (step ST603: YES), the reproduction / blow process execution control unit 108A transmits a reproduction process permission signal to the reproduction control unit 106A. As described above, when the blow process is completed in the cooling tower 110, the regeneration / blow process execution control unit 108A sends the regeneration process to the regeneration control unit 106A so that the regeneration process is executed in the water softening device 143. Send permission signal. Thereby, the process of this flowchart is complete | finished (it returns to step ST601).

  According to the water treatment system 100A of the second embodiment described above, for example, the following effects are exhibited.

  In the water treatment system 100A of the second embodiment, the regeneration / blow process execution control unit 108A limits the execution of the regeneration process by the regeneration control unit 106A while the blow process by the makeup water control unit 105A is being performed, After completion of the blow process, the reproduction control unit 106A is allowed to execute the reproduction process.

  According to this, the regeneration process of the water softening device 143 is not executed during the blow process of the cooling tower 110, and the concentration of the circulating water W110 does not proceed more than necessary. Therefore, in the water treatment system 100A, scale generation in the circulation system can be suppressed as much as possible. Further, even when the cooling tower 110 is operated for 24 hours, the number of the water softening devices 143 can be reduced to one. Therefore, in the water treatment system 100A, the system can be simplified and the facility cost can be reduced.

  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.

  For example, in the first embodiment, an example in which the regeneration process of the water softening device 143 is performed with priority is described, and in the second embodiment, an example in which the blow process of the cooling tower 110 is performed with priority is described. . Not limited to this, when the regeneration process of the water softening device 143 is executed first, the execution of the blow process in the cooling tower 110 is limited, and the blow process of the cooling tower 110 is executed first. May restrict the execution of the regeneration process in the water softening device 143.

  Further, the regeneration / blow process execution control unit 108 predicts the time when the next regeneration process is started so that the blow process of the cooling tower 110 is completed immediately before the regeneration process of the water softening device 143 is started. You may control. Specifically, the playback / blow process execution control unit 108 predicts (i) the timing when the next playback process is started, and (ii) at least the time required for the blow process from the next playback start time. Blow processing starts at a time that goes back.

  The blow processing time can be calculated based on the discharge flow rate of the circulating water W110 during the blow processing. The discharge flow rate can be obtained, for example, by providing a flow rate sensor in the drain line L130 and measuring the integrated flow rate of the circulating water W110 discharged during normal blow processing. Here, when the load on the cooling tower 110 is large, the circulating water W110 is concentrated even during the blow processing, and thus the discharge flow rate of the circulating water W110 may change. Therefore, the integrated flow rate measured during the normal blow process is corrected based on the difference between the inlet temperature of the circulating water W110 returned to the cooling tower 110 and the outlet temperature of the circulating water W110 sent from the cooling tower 110, The blow processing time may be changed.

  The time required for the blow process also varies depending on the set width (differential) of the first threshold EC1 for starting the blow process and the second threshold EC2 for ending the blow process. For example, if the set width is increased, the blow processing interval is extended (the number of times is reduced), but the time required for one blow processing is increased. When the set width is reduced, the interval between blow processes is shortened (the number of times is increased), but the time required for one blow process is shortened.

  The regeneration start time of the water softening device 143 can be predicted based on, for example, the integrated flow rate of the softened water W121 measured by a flow meter (not shown) of the water softening device 143. Furthermore, the regeneration start time of the water softening device 143 can be predicted by measuring the time interval of regeneration processing during normal operation.

  According to such control, after the blow processing of the cooling tower 110 is completed, the regeneration processing of the water softening device 143 can be executed without stagnation. For this reason, in the water treatment system, the softened water W121 from which the hardness component has been sufficiently removed can be supplied as make-up water replenished to the cooling tower 110 during the blow treatment.

  In addition, the regeneration / blow process execution control unit 108 predicts the timing when the next blow process is started so that the regeneration process of the water softening device 143 ends immediately before the blow process of the cooling tower 110 is started. You may control. Specifically, the reproduction / blow process execution control unit 108 predicts (i) the timing when the next blow process is started, and (ii) at least the time required for the reproduction process from the predicted start time of the next blow process. Playback processing is started at a time that is back by.

  In the cooling tower 110, the time when the blow process is started is, for example, measured in advance from the time when the electrical conductivity EC in the circulating water W110 exceeds 80% of the allowable value until the blow process is started. Can be obtained. Alternatively, the rate of change of the electrical conductivity EC in the circulating water W110 may be calculated every predetermined time, and the time when the electrical conductivity EC of the circulating water W110 is equal to or higher than the first threshold EC1 may be obtained by calculation. Further, the determination can be made based on the operation time of the system, the amount of makeup water, and the like. In addition, the time required for the regeneration process can be grasped from, for example, the introduction time or the extrusion time of the regeneration liquid set in advance in the water softening device 143.

  According to such control, after the regeneration process of the water softening device 143 is completed, the blow process of the cooling tower 110 can be executed without stagnation. For this reason, in the water treatment system, the softened water W121 from which the hardness component has been sufficiently removed can be supplied as make-up water replenished to the cooling tower 110 during the blow treatment.

  Moreover, although this embodiment demonstrated the example which supplies a scale inhibitor to the storage part 116 of the cooling tower 110, you may make it supply not only this but a scale inhibitor directly to the circulating water line L110. That is, if the scale inhibitor can be finally supplied to the circulating water line L110, the position where the scale inhibitor is supplied is the cooling tower 110 (watering part 112, storage part 116) and the circulating water line L110 (circulating water supply). Either the line L111 or the circulating water recovery line L112) may be used. Furthermore, the scale inhibitor may be supplied not only to the circulating water line L110 but also to the makeup water line L120 (for example, the third makeup water line L123 or the sixth makeup water line L126).

  In the present embodiment, the example in which the scale inhibitor is supplied in synchronization with the execution of the blow process has been described. However, the present invention is not limited to this, and the state in which the raw water makeup water line is set (that is, the bypass valve 144 is opened). State), the scale inhibitor may always be supplied regardless of the execution of the blow process.

  Furthermore, in this embodiment, although the example which comprised the cooling tower 110 as an open type cooling tower was demonstrated, you may comprise not only this but the cooling tower 110 as a closed type cooling tower.

DESCRIPTION OF SYMBOLS 100,100A Water treatment system 101 System control apparatus 102 Control part 103 Memory 104 Concentration determination part 105,105A Make-up water control part (blow process control part)
106, 106A Reproduction control unit (reproduction processing control unit)
107 Water quality control unit 108, 108A Regeneration / blow processing execution control unit 110 Cooling tower 116 Storage unit 133 Electrical conductivity measurement device 134 Hardness measurement device 135 Scale inhibitor supply device 143 Hard water softening device 144 Bypass valve 145 Supply water valve 147 Drain valve L110 circulating water line L120 makeup water line L121 first makeup water line L122 second makeup water line L123 third makeup water line L124 fourth makeup water line L125 fifth makeup water line L126 sixth makeup water line W110 circulation water W120 raw water W121 Softened water

Claims (3)

A water softening device for producing softened water by softening raw water with an ion exchange resin bed;
A cooling tower for cooling the softened water produced by the hard water softening device as circulating water and supplying the cooled circulating water to the cooled device;
A make-up water line for supplying softened water produced by the hard water softening device into the cooling tower as make-up water;
A circulating water line for circulating circulating water between the cooling tower and the cooled device;
A regeneration processing control unit for performing regeneration processing of the ion-exchange resin bed;
A blow process control unit for executing a blow process for discharging a part of circulating water from the cooling tower and / or the circulating water line;
Reproduction / blowing that restricts execution of the reproduction process by the reproduction process control unit or execution of the blow process by the blow process control unit so that the reproduction process and the blow process are not executed in parallel within the same period. A process execution control unit;
A water treatment system comprising. The regeneration / blow process execution control unit
While the regeneration process by the regeneration process control unit is being executed, the execution of the blow process by the blow process control unit is limited, and after the regeneration process is finished, the blow process control unit is allowed to execute the blow process. Tolerate,
The water treatment system according to claim 1. The regeneration / blow process execution control unit
Execution of the regeneration process by the regeneration process control unit is restricted while the blow process by the blow process control unit is being performed, and execution of the regeneration process by the regeneration process control unit is terminated after the blow process ends. Tolerate,
The water treatment system according to claim 1.

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