JP5853444B2 - Water treatment system - Google Patents

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 becomes high. When the concentration of circulating water increases, corrosion and scale are likely to occur in the circulation system. Therefore, it is necessary to periodically replenish water (makeup water) from the outside to dilute the circulating water. As the makeup water, softened water having a low hardness component is used in order to suppress the build-up of scale inside the piping and equipment. Softened water is produced by softening raw water (hard water) in a 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. However, the water softening process cannot be performed while the regeneration process is being performed. In view of this, 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 water softening treatment is performed by another water softening device while one water softening device performs the regeneration treatment. (For example, refer to Patent Document 1).

JP-A-6-15265

According to the above system, since a plurality of water softening devices can be used alternately, it is not necessary to temporarily interrupt the water softening treatment for the regeneration treatment. However, when a plurality of water softening devices are provided, there is a problem that the configuration of the system becomes complicated and the cost increases.
Accordingly, an object of the present invention is to provide a water treatment system capable of simplifying the system and reducing the cost.

The present invention includes a cooling tower that cools circulating water supplied to a cooled apparatus by sprinkling water into a ventilation space by a sprinkler, and stores the cooled circulating water in a reservoir, and the circulating water from the reservoir to the cooled apparatus. A circulating water supply line for supplying circulating water and a circulating water recovery line for recovering circulating water from the cooled device to the sprinkler, and circulating the circulating water between the cooling tower and the cooled device A water softening device for softening raw water and producing softened water, and a softened water replenishment water line provided with the water softening device, wherein the softened water produced by the water softening device is used as make-up water. A softened water replenishment water line to be supplied to the storage unit, a raw water replenishment water line to be supplied to the storage unit as raw water as make-up water , a scale inhibitor supply device to supply scale inhibitor to the circulating water and / or make-up water, Previous Water Softener the softened water supply time period for supplying the reservoir with softened water to a times your water softening process as makeup water, and a time zone in which the water softening apparatus executes playback processing and makeup water detecting means for detecting the raw water supply time period for supplying the reservoir as makeup water raw water, wherein when said raw water supply time period is detected by the makeup water detecting means, from the scale preventive agent supply device And a control means for supplying a scale inhibitor .

The front Symbol control means, when band the softened water supply time is detected by (i) the makeup water detecting means, the concentration of scale inhibitor in the circulating water line is in the softened water supply time zone A process of supplying the scale inhibitor from the scale inhibitor supply device so as to obtain a first concentration which is a minimum concentration necessary for suppressing the generation of scale; (ii) by the makeup water detection means; When the raw water supply time zone is detected, the scale inhibitor is supplied from the scale inhibitor supply device so that the concentration of the scale inhibitor in the circulating water line is a second concentration higher than the first concentration. It is preferable to execute the processing.

Also, with a hardness detection means for detecting the hardness of the circulating water flowing through the pre-Symbol circulating water line, wherein, when said the raw water supply time period is detected by the makeup water detecting means, (i) the When the hardness of the circulating water detected by the hardness detection means exceeds a warning hardness that is a hardness that is expected to generate scale in the raw water supply time zone, a process of supplying the scale inhibitor from the scale inhibitor supply device is performed. And (ii) if the hardness of the circulating water detected by the hardness detector is less than the warning hardness, it is preferable to execute a process in which the scale inhibitor is not supplied from the scale inhibitor supply device.

In addition, an anticorrosive agent supplying means for supplying an anticorrosive agent to the circulating water and / or make-up water is provided, and the control means, when the raw water supply time zone is detected by the make-up water detection means, (i) the hardness When the hardness of the circulating water detected by the detection means exceeds the first warning hardness, the scale prevention agent is supplied from the scale prevention agent supply device, and the process of not supplying the anticorrosion agent from the anticorrosion supply means is executed. (Ii) If the hardness of the circulating water detected by the hardness detecting means is less than a second warning hardness that is the same as the first warning hardness or lower than the first warning hardness , the scale prevention agent supply device prevents scale. It is preferable not to supply the agent and to execute a process of supplying the anticorrosive agent from the anticorrosive agent supplying means.

  ADVANTAGE OF THE INVENTION According to this invention, while simplifying a system, the water treatment system which can reduce cost 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 case the control part 102 of 1st Embodiment performs a water softening process and a reproduction | regeneration process. It is a flowchart which shows the process sequence in case the control part 102 of 2nd Embodiment performs a water softening process and a reproduction | regeneration process. It is a schematic block diagram which shows the water treatment system 100B of 3rd Embodiment. It is a functional block diagram concerning control of water treatment system 100B of a 3rd embodiment. It is a flowchart which shows the process sequence in case the control part 102 of 3rd Embodiment performs a water softening process and a reproduction | regeneration process. It is a flowchart which shows the process sequence in case the control part 102 of 3rd Embodiment performs a water softening process and a reproduction | regeneration process.

<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.

  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, and a scale inhibitor supply as a scale suppressing unit. The apparatus 135 and the system control apparatus 101 are provided. 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 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.

  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 of the dye from the absorbance when irradiated with light of a specific wavelength. Then, the colorimetric sensor determines the hardness in the sample water based on the measured absorbance. The hardness measuring device 134 is not limited to a colorimetric sensor, and may be an electrode sensor, a titration sensor, or the like.

  The 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 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 treatment can be performed. As the water softening device 143, a cation exchange device that performs water softening treatment by performing ion exchange using a single bed made of a cation exchange resin is particularly preferable. In addition, by performing ion exchange using a mixed bed composed of a cation exchange resin and an anion exchange resin, membrane separation is performed using an ion exchange apparatus that performs deionization treatment and a reverse osmosis membrane (RO membrane). Accordingly, a reverse osmosis membrane device that performs deionization treatment, an electrodialysis device that performs deionization treatment by performing membrane separation using an ion exchange membrane, and the like can also be applied.

  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 perform either the water softening process or the regeneration process (regeneration process) by switching the flow path inside the process control valve.

  The softening treatment 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 water softening process with the flow meter (not shown) provided in the inside. The hard water softening device 143 transmits a regeneration request signal to the system control device 101 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 as a regeneration end signal.

  The bypass valve 144 closes the fifth make-up water line L125 (that is, allows water to pass through the hard-water softening device 143) when the water softening process of the hard water softening device 143 is performed, thereby passing the second make-up water line L122. This is a water supply facility for supplying the softened 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 water softening process of the water softening device 143 is being performed, the second makeup water line L122, the third makeup water line L123, the 4th makeup water line L124, and the 6th 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. FIG. 2 is a functional block diagram relating to control of the water treatment system 100 of the first embodiment.

  The system control apparatus 101 controls 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. The control unit 102 includes a concentration determination unit 181, a makeup water control unit 182, a regeneration control unit 183 as a makeup water detection unit, and a water quality control unit 184 as a control unit.

  The concentration determination unit 181 determines whether or not the electrical conductivity EC of the circulating water W110 measured by the electrical conductivity measuring device 133 is greater than or equal to the first threshold EC1. As the first threshold EC1, for example, an upper limit electric conductivity that can ensure suppression of slime generation is set.

  When the concentration determination unit 181 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 182 executes 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 182 opens the drain valve 147 and discharges 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 182 opens the makeup water valve 145 and forcibly supplies new makeup water to the storage unit 116 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.

  During normal operation, the makeup water control unit 182 closes the bypass valve 144 and supplies the makeup water to the storage unit 116 as a softened water makeup water line (that is, the second makeup water line L122, the third A makeup water line L123, a fourth makeup water line L124, and a sixth makeup water line L126) are set. The makeup water control unit 182 controls the makeup water valve 145 or the drain valve 147 when the concentration determination unit 181 determines that the electrical conductivity EC of the circulating water W110 is greater than or equal to the first threshold value EC. Thus, the softening water W121 is replenished to the storage unit 116 as makeup water.

  In addition, the replenishing water control unit 182 opens the bypass valve 144 during the regeneration process of the water softening device 143 and opens the raw water replenishing water line (that is, the fifth replenishing water line) as a line for supplying the replenishing water to the storage unit 116. Water line L125, third makeup water line L123, fourth makeup water line L124, and sixth makeup water line L126) are set. Then, the makeup water control unit 182 determines that the electrical conductivity EC of the circulating water W110 is greater than or equal to the predetermined first threshold EC1 (the concentration of the circulating water W110 is high) by the concentration determination unit 181. Then, the makeup water valve 145 or the drain valve 147 is controlled to supply the storage water 116 with the raw water W120 as makeup water.

  Thereafter, the makeup water control unit 182 determines that the electrical conductivity EC of the circulating water W110 is less than the second threshold value EC2 (the concentration of the circulating water W110 is low; EC1> EC2) by the concentration determination unit 181. 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 storage unit 116. As a result, the concentration of the circulating water W110 in the storage unit 116 is reduced.

  Thus, the makeup water control unit 182 of the present embodiment sets the softened water makeup water line as a line for supplying makeup water to the storage unit 116 during the water softening process of the hard water softening device 143, and supplies the storage unit 116. The softened water W121 is replenished as makeup water. On the other hand, the replenishing water control unit 182 sets a raw water replenishing water line as a line for supplying replenishing water to the storage unit 116 and replenishes the reserving unit 116 with the raw water W120 as replenishing water when the hard water softening device 143 is regenerated. .

  By receiving the regeneration request signal from the water softening device 143, the regeneration control unit 183 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 183 receives the regeneration request signal from the water softening device 143, the regeneration control unit 183 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 183 starts the regeneration process by circulating the regeneration solution or the like through the pressure tank of the water softening device 143.

  In addition, the regeneration control unit 183 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 water softening process is performed. To do. When the regeneration control unit 183 receives a regeneration end signal from the water softening device 143, the regeneration control unit 183 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 water softening treatment. Thereafter, the regeneration control unit 183 starts the water softening process by circulating the raw water W120 through the pressure tank of the water softening device 143.

  The water quality control unit 184 prevents the scale when the regeneration control unit 183 receives the regeneration request signal from the water softening device 143, that is, when the regeneration control unit 183 detects the time zone for executing the regeneration process. 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.

  In the regeneration process, in order to reduce the amount of the scale inhibitor used, it is desirable to maintain the hardness of the circulating water W110 flowing through the circulating water line L110 as low as possible. For this reason, during the regeneration process, the replenishment amount of the raw water W120 can be set by setting the first threshold value EC1 for starting the blow process or the second threshold value EC2 for ending the blow process to a value higher than normal. It is also preferable to perform control so as to be as small as possible (that is, the frequency or amount of blow processing is as small as possible). Usually, since the regeneration treatment time of the water softening device 143 ends approximately in about 2 hours, the hardness of the circulating water W110 is higher when the softened water W121 is concentrated than when the raw water W120 is replenished. Often lower. Therefore, the usage-amount of a scale inhibitor can also be suppressed by suppressing the frequency of blow processing, or the amount of blows.

  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, in the water treatment system 100 of 1st Embodiment, the operation | movement in the case of performing a water softening process and a regeneration process is demonstrated, referring FIG. FIG. 3 is a flowchart illustrating a processing procedure when the control unit 102 according to the first embodiment executes the water softening process and the regeneration process. The control of the flowchart shown in FIG. 3 is executed by the control unit 102 (makeup water control unit 182, regeneration control unit 183, water quality control unit 184) based on a control program stored in the memory 103.

As shown in FIG. 3, in step ST101, the regeneration control unit 183 transmits a drive signal for valve control to the process control valve of the water softening device 143, and the inside of the process control valve is used for water softening treatment. The operation of switching to the flow path is executed. The regeneration process is stopped by switching the flow path of the process control valve to a flow path for water softening treatment.
In step ST <b> 102, the makeup water control unit 182 controls the bypass valve 144 to be closed, 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 183 determines whether a regeneration request signal has been received from the water softening device 143. In step ST103, when the reproduction control unit 183 determines that the reproduction request signal has been received (YES), the process proceeds to step ST104. If the reproduction control unit 183 determines in step ST103 that the reproduction request signal has not been received (NO), the process proceeds to step ST111.

  In step ST104 (step ST103: YES), the makeup water control unit 182 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 183 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. . By switching the flow path of the process control valve to the flow path for the regeneration process, the water softening process is stopped.

  In step ST <b> 106, the regeneration control unit 183 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 183 determines whether or not a regeneration end signal has been received from the water softening device 143. If the playback control unit 183 determines in step ST107 that a playback end signal has been received (YES), the process returns to step ST101. If the playback control unit 183 determines in step ST107 that the playback end signal has not been received (NO), the process proceeds to step ST121.

  Now, in step ST111 (step ST103: NO), the makeup water control unit 182 determines whether or not the electrical conductivity EC of the circulating water W110 is equal to or higher than the first threshold EC1 by the concentration determination unit 181. In this step ST111, when the makeup water control unit 182 determines that the electrical conductivity EC of the circulating water W110 is equal to or higher than the first threshold value EC1 (YES), the processing is performed because the concentration of the circulating water W110 is high. The process proceeds to step ST112. In Step ST111, when the makeup water control unit 182 determines that the electrical conductivity EC of the circulating water W110 is less than the first threshold value EC1 (NO), the concentration of the circulating water W110 is low, so Moves to step ST113.

  In step ST112 (step ST111: YES), the makeup water control unit 182 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, the makeup water control unit 182 starts the blowing process of the circulating water W110.

  In step ST113, the water quality control unit 184 determines whether or not the softening water W121 is being supplied to the storage unit 116. In this step ST113, when the water quality control unit 184 determines that the softening water W121 is being supplied to the storage unit 116 (YES), the process proceeds to step ST114. In Step ST113, when the water quality control unit 184 determines that the softening water W121 is not being supplied to the storage unit 116 (NO), the process proceeds to Step ST103.

  In step ST114 (step ST113: YES), the makeup water control unit 182 determines whether or not the electrical conductivity EC of the circulating water W110 is less than the second threshold EC2 by the concentration determination unit 181. In step ST114, when the makeup water control unit 182 determines that the electrical conductivity EC of the circulating water W110 is less than the second threshold value EC2 (YES), the degree of concentration of the circulating water W110 has decreased. The process proceeds to step ST115. In Step ST114, when the makeup water control unit 182 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 not decreased. Therefore, step ST114 is looped until it is determined as YES.

  In step ST115 (step ST114: YES), the makeup water control unit 182 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 182 ends the blowing process of the circulating water W110. When the blow process ends, the process proceeds to step ST103.

  Furthermore, in step ST121 (step ST107: NO), the makeup water control unit 182 determines whether or not the electrical conductivity EC of the circulating water W110 is greater than or equal to the first threshold value EC1 by the concentration determination unit 181. In this step ST121, when the makeup water control unit 182 determines that the electrical conductivity EC of the circulating water W110 is equal to or higher than the first threshold EC1 (YES), the processing is performed because the enrichment of the circulating water W110 is high. The process proceeds to step ST122. In Step ST121, when the makeup water control unit 182 determines that the electrical conductivity EC of the circulating water W110 is less than the first threshold value EC1 (NO), the concentration of the circulating water W110 is low, so Moves to step ST123.

  In step ST122 (step ST121: YES), the makeup water control unit 182 transmits a drive signal for valve control to the makeup water valve 145 or the drain valve 147 to replenish the storage unit 116 with the raw water W120 as makeup water. . That is, the makeup water control unit 182 starts the blowing process of the circulating water W110.

In step ST123, the water quality control unit 184 determines whether or not the raw water W120 is being replenished to the storage unit 116. In this step ST123, when the water quality control unit 184 determines that the raw water W120 is being replenished to the storage unit 116 (YES), the process proceeds to step ST124. In Step ST123, when the water quality control unit 184 determines that the raw water W120 is not being replenished to the storage unit 116 (NO), the process proceeds to Step ST107.
In step ST <b> 124, the water quality control unit 184 transmits a drive signal to the scale inhibitor supply device 135 to supply the storage unit 116 with the scale inhibitor.

  In step ST125, the makeup water control unit 182 determines whether or not the electrical conductivity EC of the circulating water W110 is less than the second threshold EC2 by the concentration determination unit 181. In step ST125, when the makeup water control unit 182 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. The process proceeds to step ST126. In Step ST125, when the makeup water control unit 182 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 not decreased. Therefore, the process returns to step ST124.

In step ST126 (step ST125: YES), the makeup water control unit 182 transmits a drive signal for valve control to the makeup water valve 145 or the drain valve 147 to stop the supply of the raw water W120 to the storage unit 116. . That is, the makeup water control unit 182 ends the blowing process of the circulating water W110.
In step ST127, the water quality control unit 184 transmits a stop signal to the scale inhibitor supply device 135 to stop the supply of the scale inhibitor to the storage unit 116. When the supply of the scale inhibitor stops, the process proceeds to step ST107.

According to the water treatment system 100 of 1st Embodiment mentioned above, the following effects are show | played, for example.
The water treatment system 100 according to the first embodiment includes a regeneration control unit 183 that detects a time zone in which the softened water W121 is supplied to the storage unit 116 as make-up water and a time zone in which the raw water W120 is supplied to the storage unit 116 as make-up water, When the regeneration control unit 183 detects a time zone during which the raw water W120 is supplied to the storage unit 116 as make-up water, the water quality that causes the scale inhibitor to be supplied from the scale inhibitor supply device 135 to the storage unit 116 of the cooling tower 110. A control unit 184.

  Therefore, while the hard water softening device 143 is being regenerated, the reservoir 116 is replenished with the raw water W120 having a high hardness, but at the same time, the scale inhibitor is supplied to suppress the generation of scale in the circulating water system. Can do. According to this, when the cooling tower 110 is operated for 24 hours, the water quality of the circulating water W110 is maintained at a level at which scale generation can be suppressed even during a period in which the water softening process cannot be performed in the hard water softening device 143. Is done. Therefore, according to the water treatment system 100 of the first embodiment, even when the cooling tower 110 is operated for 24 hours, the water softening device 143 can be made one, so that the system can be simplified and the equipment cost can be reduced. 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 that of the water treatment system 100 of the first embodiment, and therefore only the differences from the first embodiment will be described (see FIG. 1). ). In the second embodiment, portions equivalent to those in the first embodiment will be described using the same reference numerals.

  In the water treatment system 100A of the second embodiment, in the control unit 102, the function of the water quality control unit 184A (see FIG. 2) is different from that of the first embodiment. Since other functions in the control unit 102 are the same as those in the first embodiment, the description thereof is omitted.

  The water quality control unit 184A of the second embodiment, when the regeneration control unit 183 detects a time zone for supplying the softened water W121 to the storage unit 116 as makeup water, that is, a time zone for executing the water softening process. The concentration of the scale inhibitor in the circulating water line L110 is the first concentration that is the minimum concentration necessary to suppress the generation of scale in the time zone in which the softened water W121 is supplied to the storage unit 116 as makeup water. Thus, the scale inhibitor is supplied to the reservoir 116.

  In addition, the water quality control unit 184A detects the time in the circulating water line L110 when the regeneration control unit 183 detects a time zone in which the raw water W120 is supplied to the storage unit 116 as makeup water, that is, a time zone in which the regeneration process is performed. The scale inhibitor is supplied to the storage unit 116 such that the concentration of the scale inhibitor becomes a second concentration higher than the first concentration.

  As described above, in the water quality control unit 184A of the second embodiment, the scale inhibitor is supplied to the storage unit 116 in both the time zone for executing the water softening process and the time zone for executing the regeneration process. Then, the water quality control unit 184A controls the concentration of the scale inhibitor (typically, the supply concentration with respect to makeup water) based on whether the water softening process is performed or the regeneration process is performed. . The first concentration and the second concentration of the scale inhibitor are appropriately set according to the hardness of the makeup water, etc., but are set so that at least the first concentration <the second concentration.

  Next, in the water treatment system 100A according to the second embodiment, an operation when the water softening process and the regeneration process are executed will be described with reference to FIG. FIG. 4 is a flowchart illustrating a processing procedure when the control unit 102 according to the second embodiment performs the water softening process and the regeneration process. 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.

As shown in FIG. 4, in step ST201, the regeneration control unit 183 transmits a drive signal for valve control to the process control valve of the water softening device 143, and the inside of the process control valve is used for water softening treatment. The operation of switching to the flow path is executed. The regeneration process is stopped by switching the flow path of the process control valve to a flow path for water softening treatment.
In step ST202, the makeup water control unit 182 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 ST203, the regeneration control unit 183 determines whether or not a regeneration request signal is received from the water softening device 143. In step ST203, when the reproduction control unit 183 determines that the reproduction request signal has been received (YES), the process proceeds to step ST204. If the playback control unit 183 determines in step S203 that a playback request signal has not been received (NO), the process moves to step ST211.

In step ST204 (step ST203: YES), the makeup water control unit 182 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 ST205, the regeneration control unit 183 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. . By switching the flow path of the process control valve to the flow path for the regeneration process, the water softening process is stopped.

  In step ST206, the regeneration control unit 183 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 causing the regeneration liquid to flow through the pressure tank.

  In step ST207, the regeneration control unit 183 determines whether or not a regeneration end signal has been received from the water softening device 143. If the playback control unit 183 determines in step ST207 that a playback end signal has been received (YES), the process returns to step ST201. If the playback control unit 183 determines in step ST207 that the playback end signal has not been received (NO), the process proceeds to step ST221.

  Now, in step ST211 (step ST203: NO), the makeup water control unit 182 determines whether or not the electrical conductivity EC of the circulating water W110 is greater than or equal to the first threshold EC1 by the concentration determination unit 181. In step ST211, when the makeup water control unit 182 determines that the electrical conductivity EC of the circulating water W110 is equal to or higher than the first threshold value EC1 (YES), the processing is performed because the degree of concentration of the circulating water W110 is high. The process proceeds to step ST212. In Step ST211, if the makeup water control unit 182 determines that the electrical conductivity EC of the circulating water W110 is less than the first threshold value EC1 (NO), the concentration of the circulating water W110 is low, so Moves to step ST213.

  In step ST212 (step ST211: YES), the makeup water control unit 182 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, the makeup water control unit 182 starts the blowing process of the circulating water W110.

  In step ST213, the water quality control unit 184 determines whether or not the softening water W121 is being supplied to the storage unit 116. In step ST213, when the water quality control unit 184 determines that the softening water W121 is being supplied to the storage unit 116 (YES), the process proceeds to step ST214. In step ST213, when the water quality control unit 184 determines that the softening water W121 is not being supplied to the storage unit 116 (NO), the process proceeds to step ST203.

  In step ST214 (step ST213: YES), the water quality control unit 184 transmits a drive signal to the scale inhibitor supply device 135 to store the scale inhibitor in the circulating water line L110 so that the concentration thereof becomes the first concentration. The scale inhibitor is supplied to the unit 116.

  In step ST215, the makeup water control unit 182 determines whether or not the electrical conductivity EC of the circulating water W110 is less than the second threshold value EC2 by the concentration determination unit 181. In step ST215, when the makeup water control unit 182 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. The process moves to step ST216. In Step ST215, when the makeup water control unit 182 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 not decreased. Therefore, the process returns to step ST214.

In step ST216 (step ST215: YES), the makeup water control unit 182 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 182 ends the blowing process of the circulating water W110.
In step ST217, the water quality control unit 184 transmits a stop signal to the scale inhibitor supply device 135 to stop the supply of the scale inhibitor to the storage unit 116. When the supply of the scale inhibitor stops, the process proceeds to step ST203.

  Furthermore, in step ST221 (step ST207: NO), the makeup water control unit 182 determines whether or not the electrical conductivity EC of the circulating water W110 is greater than or equal to the first threshold EC1 by the concentration determination unit 181. In this step ST221, when the makeup water control unit 182 determines that the electrical conductivity EC of the circulating water W110 is equal to or higher than the first threshold EC1 (YES), the processing is performed because the concentration of the circulating water W110 is high. The process proceeds to step ST222. In Step ST221, when the makeup water control unit 182 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 is low, so Moves to step ST223.

  In step ST222 (step ST221: YES), the makeup water control unit 182 transmits a drive signal for valve control to the makeup water valve 145 or the drainage valve 147 to replenish the storage unit 116 with the raw water W120 as makeup water. . That is, the makeup water control unit 182 starts the blowing process of the circulating water W110.

  In Step ST223, the water quality control unit 184 determines whether or not the raw water W120 is being replenished to the storage unit 116. In step ST223, when the water quality control unit 184 determines that the raw water W120 is being replenished to the storage unit 116 (YES), the process proceeds to step ST224. In Step ST223, when the water quality control unit 184 determines that the raw water W120 is not being supplied to the storage unit 116 (NO), the process proceeds to Step ST207.

  In step ST224 (step ST223: YES), the water quality control unit 184 transmits a drive signal to the scale inhibitor supply device 135 and stores the scale inhibitor in the circulating water line L110 so that the concentration of the scale inhibitor becomes the second concentration. The scale inhibitor is supplied to the unit 116.

  In step ST225, the makeup water control unit 182 determines whether or not the electrical conductivity EC of the circulating water W110 is less than the second threshold EC2 by the concentration determination unit 181. In this step ST225, when the makeup water control unit 182 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. The process moves to step ST226. In Step ST225, when the makeup water control unit 182 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 not decreased. Therefore, the process returns to step ST224.

In step ST226 (step ST225: YES), the makeup water control unit 182 transmits a drive signal for valve control to the makeup water valve 145 or the drain valve 147 to stop the supply of the raw water W120 to the storage unit 116. . That is, the makeup water control unit 182 ends the blowing process of the circulating water W110.
In step ST227, the water quality control unit 184 transmits a stop signal to the scale inhibitor supply device 135 to stop the supply of the scale inhibitor to the storage unit 116. When the supply of the scale inhibitor stops, the process proceeds to step ST207.

  According to the water treatment system 100A of the second embodiment described above, the same effects as those of the first embodiment are achieved. In particular, in the second embodiment, the scale inhibitor is supplied so that the concentration of the scale inhibitor in the circulating water W110 is at least the first concentration. For this reason, in the time slot | zone which performs a regeneration process, the time lag until the effect of the scale inhibitor supplied to the storage part 116 is reflected in the circulating water W110 does not arise. Therefore, in any time zone, the water quality of the circulating water W110 can be maintained at a level at which generation of scale can be suppressed.

  In addition, in the water treatment system 100A of the second embodiment, in the time zone in which the water softening treatment is performed, the scale is adjusted so that the concentration of the scale inhibitor in the circulating water line L110 falls within a predetermined concentration range (upper limit value to lower limit value). The supply amount of the inhibitor may be controlled. In that case, the upper limit value of the concentration of the scale inhibitor is set high in the time zone in which the regeneration process is executed. Thereby, in the time slot | zone which performs a regeneration process, since more scale inhibitors are supplied than the time slot | zone which performs a water softening process, the effect equivalent to this embodiment can be acquired substantially.

<Third Embodiment>
Next, a third embodiment of the present invention will be described. Since the overall configuration of the water treatment system 100B according to the third embodiment of the present invention is the same as the water treatment system 100 according to the first embodiment shown in FIG. 1, only differences from the first embodiment will be described. . In the third embodiment, portions equivalent to those in the first embodiment will be described using the same reference numerals.

  FIG. 5 is a schematic configuration diagram showing a water treatment system 100B of the third embodiment. The water treatment system 100B of the third embodiment includes an anticorrosive agent supply device 136. The anticorrosive supply device 136 is a device that supplies the anticorrosive to the storage unit 116 of the cooling tower 110. The anticorrosive agent supply device 136 is connected to the storage part 116 of the cooling tower 110 via an anticorrosive agent supply line L160.

  An anticorrosive agent is a chemical used mainly to suppress the occurrence of general corrosion in a piping system or the like, or partial corrosion such as pitting. Examples of the anticorrosive agent that can be used here include silicate, nitrite, zinc salt, molybdenum salt, phosphonocarboxylate, and benzotriazole derivative.

  The anticorrosive agent supply device 136 is electrically connected to the system control device 101. The timing and supply amount of the anticorrosive agent supplied from the anticorrosive agent supply device 136 to the storage unit 116 are controlled by a drive signal transmitted from the system control device 101.

  FIG. 6 is a functional block diagram relating to control of the water treatment system 100B of the third embodiment. In the water treatment system 100B of the third embodiment, in the control unit 102, the function of the water quality control unit 184B (see FIG. 3) is different from that of the first embodiment. Since other functions in the control unit 102 are the same as those in the first embodiment, the description thereof is omitted.

  The water quality control unit 184B of the third embodiment performs hardness measurement when the regeneration control unit 183 detects a time zone in which the raw water W120 is supplied to the storage unit 116 as makeup water, that is, a time zone in which the regeneration process is performed. If the hardness H of the circulating water W110 measured by the device 134 is equal to or higher than the first warning hardness Hth1 that is the lower limit hardness that is expected to generate scale in the time zone in which the raw water W120 is supplied to the storage unit 116 as makeup water. Then, the scale preventive agent is supplied from the scale preventive agent supply device 135 and the anticorrosive agent is not supplied from the anticorrosive agent supply device 136 to the storage unit 116.

  Further, the water quality control unit 184B uses the hardness measurement device 134 when the regeneration control unit 183 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 the regeneration process is performed. The measured hardness H of the circulating water W110 is less than the second warning hardness Hth2 (<Hth1), which is the upper limit hardness at which corrosion is expected to occur in the time zone in which the raw water W120 is supplied to the storage unit 116 as makeup water. For example, a process of preventing the scale inhibitor from being supplied from the scale inhibitor supply apparatus 135 and supplying the corrosion inhibitor from the anticorrosive supply apparatus 136 to the storage unit 116 is executed.

In the present embodiment, the alert hardness is set in two stages. The first warning hardness Hth1 can be set to 10 mgCaCO ₃ / L, for example. The second alert hardness Hth2, for example, can be set to 5mgCaCO ₃ / L.
Moreover, you may have one alertness hardness. In that case, the scale inhibitor is supplied if the hardness H of the circulating water W110 is equal to or higher than the warning hardness, and the supply of the scale inhibitor is stopped if the hardness H of the circulating water W110 is less than the warning hardness. Moreover, when the warning hardness is set to one, the warning hardness can be set to about 20 mg CaCO ₃ L, for example.

  Next, in the water treatment system 100B of the third embodiment, the operation when the water softening process and the regeneration process are executed will be described with reference to FIGS. 7 and 8 are flowcharts showing a processing procedure when the control unit 102 of the third embodiment executes the water softening process and the regeneration process. The control in the flowcharts shown in FIGS. 7 and 8 is executed by the control unit 102 based on the control program stored in the memory 103.

As shown in FIG. 7, in step ST301, the regeneration control unit 183 transmits a drive signal for valve control to the process control valve of the water softening device 143, and the inside of the process control valve is used for water softening treatment. The operation of switching to the flow path is executed. The regeneration process is stopped by switching the flow path of the process control valve to a flow path for water softening treatment.
In step ST302, the makeup water control unit 182 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 ST303, the regeneration control unit 183 determines whether a regeneration request signal is received from the water softening device 143. In step ST303, when the reproduction control unit 183 determines that the reproduction request signal has been received (YES), the process proceeds to step ST304. If the playback control unit 183 determines in step ST303 that the playback request signal has not been received (NO), the process moves to step ST311.

In step ST304 (step ST303: YES), the makeup water control unit 182 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 ST305, the regeneration control unit 183 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. . By switching the flow path of the process control valve to the flow path for the regeneration process, the water softening process is stopped.

  In step ST306, the regeneration control unit 183 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 ST307, the regeneration control unit 183 determines whether or not a regeneration end signal has been received from the water softening device 143. If the playback control unit 183 determines in step ST307 that a playback end signal has been received (YES), the process returns to step ST301. If the playback control unit 183 determines in step ST307 that the playback end signal has not been received (NO), the process proceeds to step ST321.

  In step ST311 (step ST303: NO), the makeup water control unit 182 determines whether or not the electrical conductivity EC of the circulating water W110 is greater than or equal to the first threshold EC1 by the concentration determination unit 181. In this step ST311, when the makeup water control unit 182 determines that the electrical conductivity EC of the circulating water W110 is equal to or higher than the first threshold EC1 (YES), the processing is performed because the concentration of the circulating water W110 is high. The process proceeds to step ST312. Further, in step ST311, when the makeup water control unit 182 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 is low, so Moves to step ST313.

  In step ST312 (step ST311: YES), the makeup water control unit 182 transmits a drive signal for valve control to the makeup water valve 145 or the drain valve 147, and replenishes the storage unit 116 with the softened water W121 as makeup water. Let That is, the makeup water control unit 182 starts the blowing process of the circulating water W110.

  In step ST313, the water quality control unit 184 determines whether or not the softening water W121 is being supplied to the storage unit 116. In step ST313, when the water quality control unit 184 determines that the softening water W121 is being supplied to the storage unit 116 (YES), the process proceeds to step ST314. In Step ST113, when the water quality control unit 184 determines that the softening water W121 is not being supplied to the storage unit 116 (NO), the process proceeds to Step ST303.

  In step ST314 (step ST313: YES), the makeup water control unit 182 determines whether or not the electrical conductivity EC of the circulating water W110 is less than the second threshold EC2 by the concentration determination unit 181. In this step ST314, when the makeup water control unit 182 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. The process moves to step ST315. In Step ST314, when the makeup water control unit 182 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 not decreased. Therefore, step ST314 is looped until it is determined to be YES.

  In step ST315 (step ST314: YES), the makeup water control unit 182 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 182 ends the blowing process of the circulating water W110. When the blow process ends, the process proceeds to step ST303.

  Furthermore, in step ST321 (step ST307: NO), the makeup water control unit 182 determines whether or not the electrical conductivity EC of the circulating water W110 is greater than or equal to the first threshold EC1 by the concentration determination unit 181. In this step ST321, when the makeup water control unit 182 determines that the electrical conductivity EC of the circulating water W110 is equal to or higher than the first threshold value EC1 (YES), the processing is performed because the concentration of the circulating water W110 is high. The process proceeds to step ST322. In Step ST321, when the makeup water control unit 182 determines that the electrical conductivity EC of the circulating water W110 is less than the first threshold value EC1 (NO), the concentration of the circulating water W110 is low, so Moves to step ST323.

  In step ST322 (YES in step ST321), the makeup water control unit 182 transmits a drive signal for valve control to the makeup water valve 145 or the drain valve 147, and causes the storage unit 116 to replenish the raw water W120 as makeup water. . That is, the makeup water control unit 182 starts the blowing process of the circulating water W110.

  In step ST323, the water quality control unit 184 determines whether or not the raw water W120 is being replenished to the storage unit 116. In this step ST323, when the water quality control unit 184 determines that the raw water W120 is being replenished to the storage unit 116 (YES), the process proceeds to step ST324. In step ST323, when the water quality control unit 184 determines that the raw water W120 is not being replenished to the storage unit 116 (NO), the process proceeds to step ST307.

  In step ST324, the water quality control unit 184 executes a supply process of the scale inhibitor or the anticorrosive to the storage unit 116. Details of this supply process will be described later.

  In step ST325, the makeup water control unit 182 determines whether or not the electrical conductivity EC of the circulating water W110 is less than the second threshold EC2 by the concentration determination unit 181. In step ST325, when the makeup water control unit 182 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. The process moves to step ST326. In Step ST325, when the makeup water control unit 182 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 not decreased. Therefore, the process returns to step ST324.

In step ST326 (step ST325: YES), the makeup water control unit 182 transmits a drive signal for valve control to the makeup water valve 145 or the drain valve 147 to stop the supply of the raw water W120 to the storage unit 116. . That is, the makeup water control unit 182 ends the blowing process of the circulating water W110.
In step ST327, the water quality control unit 184 transmits a stop signal to the scale inhibitor supply device 135 and the anticorrosive agent supply device 136 to stop the supply of the scale inhibitor and the anticorrosive to the storage unit 116. When the supply of the medicine is stopped, the process proceeds to step ST307.

Next, with reference to FIG. 8, the supply process of the scale inhibitor or the anticorrosive to the storage part 116 is demonstrated.
In step ST331, the water quality control unit 184 acquires the hardness H of the circulating water W110 measured by the hardness measuring device 134.

  In step ST332, the water quality control unit 184 determines whether the acquired hardness H is equal to or higher than the first warning hardness Hth1. In step ST332, when the water quality control unit 184 determines that hardness H ≧ first warning hardness Hth1 (YES), the process proceeds to step ST333. On the other hand, when the water quality control unit 184 determines in step ST332 that hardness H <first warning hardness Hth1 (NO), the process proceeds to step ST335.

  In step ST333 (step ST332: YES), the water quality control unit 184 transmits a drive signal to the scale inhibitor supply device 135 to supply the storage unit 116 with the scale inhibitor.

  In step ST334, the water quality control unit 184 transmits a stop signal to the anticorrosive agent supply device 136 to stop the supply of the anticorrosive agent to the storage unit 116. When the water quality control unit 184 stops the supply of the anticorrosive agent, the process of this flowchart ends, and the process moves to step ST325.

  In step ST335 (step ST332: NO), the water quality control unit 184 determines whether or not the acquired hardness H is less than the second warning hardness Hth2. In step ST335, when the water quality control unit 184 determines that the hardness H <the second warning hardness Hth2 (YES), the process proceeds to step ST336. On the other hand, when the water quality control unit 184 determines in step ST335 that the hardness H ≧ second warning hardness Hth2 (NO), the process of this flowchart ends, and the process moves to step ST325.

In step ST336, the water quality control unit 184 transmits a stop signal to the scale inhibitor supply device 135 to stop the supply of the scale inhibitor to the storage unit 116.
In step ST <b> 337, the water quality control unit 184 transmits a drive signal to the anticorrosive agent supply device 136 to supply the anticorrosive agent to the storage unit 116. When the water quality control unit 184 causes the anticorrosive agent to be supplied, the process of this flowchart ends, and the process moves to step ST325.

  According to the water treatment system 100B of the third embodiment described above, the same effects as those of the first embodiment are achieved. In particular, in the third embodiment, when the hardness H of the circulating water W110 is equal to or higher than the first warning hardness Hth1 in the time zone in which the raw water W120 is supplied to the storage unit 116 as makeup water, the scale inhibitor is supplied and circulated. When the hardness H of the water W110 is less than the second warning hardness Hth2, the supply of the scale inhibitor is stopped. According to this, when the hardness H of the circulating water W110 is relatively low and the water quality is unlikely to generate scale, since the scale inhibitor is not supplied, the amount of the scale inhibitor used can be suppressed.

  In the third embodiment, when the scale inhibitor is not supplied to the storage unit 116, an anticorrosive agent is supplied. For this reason, in the case of water quality in which scale is unlikely to occur, that is, water quality in which corrosion is likely to occur, the occurrence of corrosion in the piping system or the like can be suppressed. In addition, when the scale inhibitor is supplied to the storage unit 116, the supply of the anticorrosive agent is stopped. For this reason, the amount of anticorrosive used can be suppressed in the case of water quality in which corrosion is unlikely to occur, that is, water quality in which scale is likely to occur.

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 the present embodiment, an example in which a scale inhibitor is supplied alone as a drug has been described. However, the present invention is not limited thereto, and the drug is a combined treatment in which an anticorrosive and / or a slime control agent is appropriately combined with the scale inhibitor. An agent may be used. Examples of usable slime control agents include halogen-based oxidizing agents such as sodium hypochlorite, oxygen-based oxidizing agents such as hydrogen peroxide, isothiazoline-based compounds, carbamate-based compounds, and the like.

  In the present embodiment, the example in which the scale inhibitor is supplied to the storage unit 116 of the cooling tower 110 has been described. 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 of starting the supply of makeup water based on the electrical conductivity of the circulating water W110 has been described. However, the present invention is not limited to this. May be.

Moreover, although this embodiment demonstrated the example which supplies a chemical | medical agent synchronizing with implementation of a blow process, it is not restricted to this, The state in which the raw water supplementary water line is set (namely, bypass valve 144 is an open state) If so, the drug may be always supplied regardless of the blow processing.
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.

100, 100A, 100B Water treatment system 101 System controller 102 Controller 103 Memory 110 Cooling tower 116 Reservoir 133 Electric conductivity measuring device 134 Hardness measuring device (hardness detecting means)
135 Scale inhibitor supply device (scale suppression means)
136 Anticorrosive Supply Device (Anticorrosive Supply Unit)
143 Hard water softening device 144 Bypass valve 145 Makeup water valve 147 Drainage valve 181 Concentration determination unit 182 Makeup water control unit 183 Regeneration control unit (makeup water detection means)
184, 184A, 184B Water quality control unit (control means)
L110 Circulating water line L120 Make-up water line L121 First make-up water line L122 Second make-up water line (softened water make-up water line)
L123 3rd makeup water line (softened water makeup water line, raw water makeup water line)
L124 4th makeup water line (softened water makeup water line, raw water makeup water line)
L125 5th makeup water line (raw water makeup water line)
L126 6th makeup water line (softened water makeup water line, raw water makeup water line)
W110 Circulating water W120 Raw water (Supply water)
W121 Softened water (makeup water)

Claims (4)

A cooling tower that circulates and cools the circulating water supplied to the apparatus to be cooled to the ventilation space by the sprinkling unit, and stores the cooled circulating water in the storage unit;
A circulating water supply line for supplying the circulating water from the storage unit to the cooled device and a circulating water recovery line for collecting the circulating water from the cooled device to the water sprinkling unit. A circulating water line circulating between the cooling device and
A water softening device that softens raw water to produce softened water;
A softened water replenishment water line provided with the hard water softening device, wherein the softened water replenishment water line supplies softened water produced by the hard water softening device to the storage unit as make-up water, and
Raw water supply water line for supplying raw water as make-up water to the storage unit;
A scale inhibitor supply device for supplying scale inhibitor to the circulating water and / or makeup water;
The water softener softened water supply time period for supplying the reservoir as makeup water softening water a times your water softening treatment, and, there in the time zone where the water softening apparatus executes playback processing Supply water detecting means for detecting a raw water supply time zone for supplying raw water as make-up water to the storage unit;
When the raw water supply time zone is detected by the makeup water detection means, a control means for supplying a scale inhibitor from the scale inhibitor supply apparatus ;
A water treatment system comprising. Before SL control unit, when (i) the supplementary water detecting the softened water supply time zone by means is detected, the concentration of scale inhibitor in the circulating water line, the scale in the softened water supply time zone A process of supplying a scale inhibitor from the scale inhibitor supply device so as to obtain a first concentration that is a minimum concentration necessary for suppressing the generation, and (ii) the raw water by the makeup water detection means When the supply time zone is detected, a process of supplying the scale inhibitor from the scale inhibitor supply device so that the concentration of the scale inhibitor in the circulating water line is a second concentration higher than the first concentration. The water treatment system according to claim 1 to be executed. Includes a hardness detecting means for detecting the hardness of the circulating water flowing through the pre-Symbol circulating water line,
When the raw water supply time zone is detected by the makeup water detection means, the control means (i) the scale of the circulating water detected by the hardness detection means is generated in the raw water supply time zone. If the warning hardness, which is the expected hardness, is exceeded, a process for supplying the scale inhibitor from the scale inhibitor supply device is executed, and (ii) the hardness of the circulating water detected by the hardness detection means falls below the warning hardness. The water treatment system according to claim 1, wherein a process that does not supply scale inhibitor from the scale inhibitor supply apparatus is performed. An anticorrosive agent supplying means for supplying the anticorrosive agent to the circulating water and / or makeup water;
When the raw water supply time zone is detected by the makeup water detection means, the control means (i) prevents the scale if the hardness of the circulating water detected by the hardness detection means exceeds a first warning hardness. A scale inhibitor is supplied from the agent supply device, and a process in which the anticorrosive agent is not supplied from the anticorrosive agent supplying means is executed, and (ii) the hardness of the circulating water detected by the hardness detecting means is the first warning hardness And the processing for causing the anticorrosive agent to be supplied from the anticorrosive agent supply means, while preventing the scale inhibitor from being supplied from the scale inhibitor supply device, if lower than the second alarm hardness lower than the first alarm hardness. The water treatment system according to claim 3 to be executed.

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