JP2017180985A - Water treatment system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water treatment system capable of easily managing the concentration of a water treatment agent with respect to circulation water.SOLUTION: The water treatment system comprises: a circulation water line L110 for circulating circulation water W2 between a cooling tower 120 and a device to be cooled 131; replenishing means 136 and 153 for replenishing make-up water W1 to the circulation water W2; water treatment agent addition means 134 for adding the water treatment agent to the circulation water W2; water discharge means 136 and 153 for discharging the circulation water W2 to the outside of the system; a concentration control part 100 for controlling the replenishing means 136 and 153, the water treatment agent addition means 134 and the water discharge means 136 and 153 to maintain the concentration of the water treatment agent with respect to the circulation water W2; corrosion rate detection means 140 using the circulation water W2; and a water quality control part 100 which, when the corrosion rate exceeds the prescribed threshold, controls the replenishing means 136 and 153 and the water discharge means 136 and 153 so that the circulation water W2 is replaced, alternatively controls the water treatment agent addition means 134 so as to add the water treatment agent to the circulation water W2.SELECTED DRAWING: Figure 1

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 also referred to as “circulated water” as appropriate). The circulating water circulates between the cooling tower and the apparatus to be cooled through the circulating water line (the circulating water supply line and the circulating water recovery line).

  In the water treatment system, when the circulating water is continuously circulated, the quality of the circulating water gradually deteriorates and various water troubles that reduce the cooling capacity occur. Therefore, in order to improve the quality of the circulating water, water treatment agents such as a slime inhibitor and an anticorrosive agent are mainly added to the circulating water line.

  These water treatment agents do not exhibit sufficient effects unless they are constantly maintained at a certain concentration or higher. On the other hand, excessive injection of the water treatment agent is economically wasteful and may cause harmful effects. Therefore, when a water treatment agent is used, it is desirable to control the concentration of the drug in the circulating water so that the purpose of use is achieved most effectively and economically.

  Regarding the addition method of the anti-slime agent for improving the quality of the circulating water, a slime suppression method that adjusts the addition amount of the drug so that the corrosion rate of the circulating water line is within a certain range has been proposed (for example, Patent Document 1). Japanese Patent Laid-Open No. 2004-228561 uses the fact that the corrosion rate is increased by the addition of a chemical containing a halogen-based oxide to adjust the amount of the chemical added with the corrosion rate. However, not all drugs are related to corrosion rate, and depending on the type of drug, it is not necessarily effective. Furthermore, it is difficult to manage the drug when the drug stays for a long time and deteriorates.

  Further, a method has been proposed in which a fluorescent tracer is added to circulating water together with a water treatment agent, and the concentration of the water treatment agent added to the circulating water is managed based on the concentration of the fluorescent tracer with respect to the circulating water (for example, Patent Documents). 2). According to Patent Document 2, the water treatment system manages the concentration of the water treatment agent with respect to the circulating water by associating the concentration change of the fluorescent tracer with respect to the circulating water and the concentration change of the chemical with respect to the circulating water.

JP 2010-167320 A Japanese Patent Laid-Open No. 2004-322058

  However, in the process in which the circulating water circulates in the circulating water line, the water treatment agent reacts with various components including organic substances contained in the circulating water line and the like, so that the effective component concentration of the water treatment agent decreases ( Hereinafter, when the water treatment agent reacts with various components contained in the circulating water line or the like, the decrease in the active ingredient concentration of the water treatment agent is also referred to as “agent deterioration”). Therefore, for example, when the circulating water circulates in the circulating water line for a long period of time, the deterioration of the agent proceeds, and the change in the concentration of the fluorescent tracer with respect to the circulating water corresponds to the change in the concentration of the active ingredient of the drug with respect to the circulating water. It becomes difficult. Therefore, even using the technique described in Patent Document 2, it is difficult to easily manage the concentration of the water treatment agent with respect to the circulating water.

  An object of this invention is to provide the water treatment system which can manage the density | concentration of the water treatment agent with respect to circulating water easily.

  The present invention provides a cooling tower for cooling circulating water to be supplied to the apparatus to be cooled, circulating water returned from the apparatus to be cooled, and circulation for circulating the circulating water between the cooling tower and the apparatus to be cooled. A water line, replenishing means for supplying makeup water to the circulating water, water treatment agent adding means for adding a water treatment agent to the circulating water, and discharging the circulating water from the cooling tower, the circulating water line or the device to be cooled. Draining means, concentration detecting means for detecting the concentration of the water treatment agent relative to the circulating water, corrosion rate detecting means for detecting the corrosion rate of the cooling tower, the circulating water line or the apparatus to be cooled, and the concentration detecting means A concentration control unit for controlling one or more of the replenishing means, the water treatment agent adding means, and the draining means so that the concentration of the water treatment agent detected by the step becomes a reference concentration value; and the corrosion rate detection Detected by means When the corrosion rate exceeds a predetermined threshold, the replenishing means and the draining means are controlled so that a predetermined amount of circulating water is replaced, or the predetermined amount of water treatment agent is added. The present invention relates to a water treatment system comprising a water quality control unit that controls water treatment agent addition means.

  The water treatment agent added by the water treatment agent addition means includes a fluorescent tracer, and the concentration detection means detects the concentration of the water treatment agent with respect to the circulating water based on the concentration of the fluorescent tracer with respect to the circulating water. It is preferable to do.

  Further, the apparatus further comprises a makeup water supply amount detection means for detecting the supply amount of makeup water, and a concentration magnification detection means for detecting the concentration ratio of circulating water, wherein the water treatment agent addition means supplies the replenishment water to the supplement An amount of water treatment agent proportional to the supply amount of makeup water detected by the water supply amount detection means is added, and the concentration detection means includes a supply amount of makeup water detected by the makeup water supply amount detection means, It is preferable to detect the concentration of the water treatment agent with respect to the circulating water based on the concentration rate of the circulating water detected by the concentration ratio detecting means.

  Moreover, it is preferable that the said corrosion rate detection means detects the corrosion rate of at least copper among the metals contained in the said cooling tower, the said circulating water line, or the said to-be-cooled apparatus.

  Moreover, it is preferable that the said corrosion rate detection means detects the corrosion rate of at least iron among the metals contained in the said cooling tower, the said circulating water line, or the said to-be-cooled apparatus.

  ADVANTAGE OF THE INVENTION According to this invention, the water treatment system which can manage the density | concentration of the water treatment agent with respect to circulating water easily can be provided.

It is a schematic block diagram which shows the water treatment system which concerns on 1st Embodiment. It is a flowchart which shows operation | movement of 1st water quality control in the water treatment system which concerns on 1st Embodiment. It is a flowchart which shows operation | movement of 2nd water quality control in the water treatment system which concerns on 1st Embodiment. It is a schematic block diagram which shows the water treatment system which concerns on 2nd Embodiment. It is a flowchart which shows operation | movement of 3rd water quality control in the water treatment system which concerns on 3rd Embodiment.

Hereinafter, embodiments of the water treatment system of the present invention will be described.
(First embodiment)
The water treatment system according to the first embodiment will be described with reference to the drawings. Drawing 1 is a schematic structure figure showing water treatment system 1 concerning a 1st embodiment.

  As shown in FIG. 1, the water treatment system 1 according to the first embodiment circulates water W2 (cooling water) in order to cool a cooled device 131 such as a heat exchanger incorporated in an air conditioner or a refrigerator. It is a system that circulates. The circulating water W2 is circulated and used while being cooled by the cooling tower 120 from the viewpoint of saving. In the present embodiment, the cooling tower 120 is a so-called open type cooling tower.

  The water treatment system 1 of the present embodiment includes, as main components, a cooling tower 120, an apparatus to be cooled 131, replenishing means (a replenishing water line L120, a replenishing water valve 136), and a draining means (first draining line L130). , Second drain line L131, drain valve 153), chemical concentration sensor 133 as concentration detection means, chemical supply device 134 as water treatment agent addition means, corrosion rate sensor 140 as corrosion rate detection means, replenishment A flow rate sensor FM as water supply amount detection means and a control unit 100 are provided. The replenishing water valve 136 may function as a draining unit, and the draining valve 153 may function as a replenishing unit.

  In addition, in FIG. 1 (and FIG. 4 mentioned later), illustration of the electrical connection line of the control part 100 and a to-be-controlled device is abbreviate | omitted. The water treatment system 1 includes a circulating water line L110, a makeup water line L120, a first drainage line L130, and a second drainage line L131 as main lines. The “line” is a general term for a line capable of fluid flow such as a flow path, a path, and a pipeline.

  The cooling tower 120 is a facility for cooling the circulating water W <b> 2 to be supplied to the cooled device 131 and the circulating water W <b> 2 returned from the cooled device 131. Specifically, the cooling tower 120 is a facility for supplying the makeup water W1 and supplying the makeup water W1 as the circulating water W2 to the cooled device 131 and cooling the circulating water W2 returned from the cooled device 131. is there. The cooling tower 120 includes a tower main body 121 and a storage unit 122.

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

  The storage part 122 is a site | part which stores the circulating water W2 cooled by the circulating water cooling part. The storage part 122 is provided in the lower part of the tower main body 121. A circulating water line L110 (a circulating water supply line L111 described below) is connected to the bottom of the storage unit 122. The circulating water W2 stored in the storage unit 122 is supplied to the cooled apparatus 131 via the circulating water supply line L111. In addition, an overflow port 138 serving as an upstream end portion of the first drainage line L <b> 130 is disposed inside the storage unit 122. The reservoir 122 is provided with a water tap 137, a drug concentration sensor 133, and a corrosion rate sensor 140.

  The drug concentration sensor 133 as a concentration detection unit is a device that detects the concentration of the water treatment agent (drug) (hereinafter also referred to as “drug concentration M”) with respect to the circulating water W2. Specifically, the drug concentration sensor 133 detects (calculates) the drug concentration M based on the concentration of the fluorescent tracer with respect to the circulating water W2. For example, the drug concentration sensor 133 calculates a value obtained by multiplying the concentration of the fluorescent tracer detected by the drug concentration sensor 133 by a proportional constant A as the drug concentration M. In the present embodiment, the drug concentration sensor 133 is connected to the bottom of the storage unit 122. The drug concentration sensor 133 is electrically connected to the control unit 100. The drug concentration M detected by the drug concentration sensor 133 is transmitted to the control unit 100. The drug concentration sensor 133 detects the fluorescence tracer concentration at a predetermined time interval (or real time), and transmits the drug concentration M to the control unit 100. The control unit 100 stores the received drug concentration M.

  The corrosion rate sensor 140 is a device that detects the corrosion rate (hereinafter also referred to as “corrosion rate CR”) of the cooling tower 120 (reservoir 122). In the present embodiment, the corrosion rate sensor 140 is a device that detects the corrosion rate CR of the cooling tower 120 (the storage unit 122 by the polarization resistance method) using the circulating water W2 stored in the storage unit 122. The corrosion rate sensor 140 is connected to the bottom of the reservoir 122. The corrosion rate of the reservoir 122 is continuously detected by the corrosion rate sensor 140 detecting the corrosion rate of the reservoir 122 by the polarization resistance method. The corrosion rate sensor 140 is electrically connected to the control unit 100. The corrosion rate CR detected by the corrosion rate sensor 140 is transmitted to the control unit 100. The corrosion rate sensor 140 is The corrosion rate CR is detected at a predetermined time interval (or real time), and the corrosion rate CR is transmitted to the control unit 100.

  The corrosion rate sensor 140 includes a pair of electrodes (not shown) installed at a predetermined interval. In this embodiment, the pair of electrodes is an electrode made of copper (Cu) or an electrode made of iron (Fe) (hereinafter, a corrosion rate sensor in which the electrode is made of copper (Cu) is referred to as “made of copper (Cu). Corrosion rate sensor whose electrode is made of iron (Fe) is also called “iron (Fe) corrosion rate sensor”). That is, in this embodiment, a corrosion rate sensor made of copper (Cu) or a corrosion rate sensor made of iron (Fe) is used as the corrosion rate sensor 140. The corrosion rate sensor 140 measures polarization resistance (corrosion reaction resistance, charge transfer resistance) by immersing a pair of electrodes in the circulating water W2 stored in the storage unit 122 and applying a voltage between the electrodes, and cooling tower The corrosion rate CR of 120 (reservoir 122) is detected.

  The copper (Cu) corrosion rate sensor detects the corrosion rate of copper (Cu) contained in the cooling tower 120. The iron (Fe) corrosion rate sensor detects the corrosion rate of iron (Fe) contained in the cooling tower 120.

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

  The circulating water supply line L111 connects the storage part 122 of the cooling tower 120 and the apparatus to be cooled 131. The circulating water W2 stored in the storage unit 122 is supplied to the cooled device 131 via the circulating water supply line L111. A circulating water pump 132 is provided in the middle of the circulating water supply line L111. In addition, a chemical supply device 134 is provided in the circulating water supply line L111. In the present embodiment, the medicine supply device 134 is connected to the circulating water supply line L111 on the downstream side of the circulating water pump 132.

  The circulating water pump 132 discharges the circulating water W2 from the upstream side to the downstream side of the circulating water line L110 (the circulating water supply line L111, the circulating water recovery line L112). The circulating water pump 132 is electrically connected to the control unit 100. The operation (drive and stop) of the circulating water pump 132 is controlled by a pump operation signal output from the control unit 100.

  The chemical supply device 134 is a device that supplies a water treatment agent to the circulating water W2. In the present embodiment, the chemical supply device 134 applies an anticorrosive agent (a fluorescent tracer is blended) to the circulating water W2 flowing through the circulating water supply line L111 by a normal addition process (described later) and a forced addition process (described later). The contained drug (hereinafter also referred to as “drug W3”) is supplied. That is, the medicine supply device 134 adds the medicine W3 to the circulating water W2, and the medicine W3 added by the medicine supply device 134 includes a fluorescent tracer.

  As an anticorrosive which reduces the corrosion rate of a copper (Cu) component, the anticorrosive containing a benzotriazole derivative is used, For example, the anticorrosive containing benzotriazole, tolyltriazole, mercaptobenzothiazole etc. is mentioned.

  As the anticorrosive that reduces the corrosion rate of the iron (Fe) component, an anticorrosive containing a carboxylic acid-based material, an acrylic acid-based material, or a heavy metal-based material is used. Examples of the carboxylic acid-based material include an anticorrosive containing maleic acid polymer, phosphinocarboxylic acid copolymer, bis (poly-2-carboxyethyl) phosphinic acid, and the like. Examples of the acrylic material include anticorrosives including acrylic acid polymer, acrylic acid copolymer (for example, hydroxypropyl acrylate copolymer), and the like. Examples of heavy metal materials include anticorrosives including sodium molybdenum, zinc sulfate, and zinc nitrate.

  As the fluorescent tracer contained in the medicine W3, a lithium salt such as lithium chloride, a fluorescent compound such as pyrenesulfonic acid, a dye having absorption at a specific wavelength, or the like is used.

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

  The to-be-cooled device 131 has a circulating water flow path (not shown). In this circulating water flow path, the circulating water W2 flows from the upstream side toward the downstream side. The upstream end of the circulating water flow path is connected to the downstream end of the circulating water supply line L111. The downstream end of the circulating water flow path is connected to the upstream end of the circulating water recovery line L112.

  The circulating water recovery line L112 is a line that connects the cooled device 131 and the cooling tower 120. In the to-be-cooled device 131, the circulating water W2 heated by heat exchange is recovered to a circulating water cooling unit (not shown) of the cooling tower 120 via the circulating water recovery line L112. Moreover, the 2nd drainage line L131 has branched from the connection part J2 of the circulating water collection | recovery line L112.

  In addition, a makeup water line L120 is connected to the cooling tower 120. The replenishing means for supplying makeup water W1 to the circulating water W2 includes a makeup water line L120 and a makeup water valve 136. The makeup water line L120 is a line that supplies the makeup water W1 to the cooling tower 120 (reservoir 122). The makeup water line L120 includes a first makeup water line L121, a second makeup water line L122, and a third makeup water line L123.

  The 1st makeup water line L121 is a line which connects the supply source (not shown) of makeup water W1, and branching part J3. The upstream side of the first makeup water line L121 is connected to a supply source (not shown) of makeup water W1. On the other hand, the downstream side of the first makeup water line L121 is branched into a second makeup water line L122 and a third makeup water line L123 at the branch portion J3. A flow sensor FM is provided in the middle of the first makeup water line L121.

  The flow sensor FM is a device that detects the supply amount of the makeup water W1. The flow sensor FM is disposed between a supply source (not shown) of the makeup water W1 and the branch portion J3. The flow sensor FM is electrically connected to the control unit 100. The pulse signal output from the flow sensor FM is transmitted to the control unit 100. As the flow rate sensor FM, for example, a pulse transmission type flow rate sensor in which an axial flow impeller or a tangential impeller (not shown) is disposed in the flow path housing can be used.

  The pulse transmission type flow sensor used in this embodiment includes an impeller in which the tips of even-numbered blades are alternately magnetized with N and S poles, and the rotation of the impeller is detected by a Hall IC. By doing so, a pulse signal having a time width proportional to the flow rate of the makeup water W1 is output. In response to the change in magnetic flux accompanying the rotational movement of the impeller, the Hall IC outputs a rectangular wave pulse signal as a supply amount every time the impeller rotates once. Therefore, the control unit 100 can detect the supply amount of the makeup water W1 based on the pulse signal output from the flow sensor FM.

  The downstream end portion of the second makeup water line L122 is connected to the storage portion 122 of the cooling tower 120. In the second makeup water line L122, a makeup water valve 136 is provided between the branch portion J3 and the cooling tower 120.

  The makeup water valve 136 is a water supply facility that forcibly supplies the makeup water W1 to the storage section 122 by opening and closing the second makeup water line L122. The makeup water valve 136 is electrically connected to the control unit 100. The open / close state (open / closed state) of the valve body in the makeup water valve 136 is controlled by a makeup water valve drive signal output from the control unit 100.

  The downstream end of the third makeup water line L123 is connected to the tower body 121 of the cooling tower 120. A water faucet 137 is provided at the downstream end of the third makeup water line L123. The water tap 137 is a ball tap type water supply facility that manages the water level (that is, the amount of water) of the circulating water W <b> 2 stored in the storage unit 122. When the water level of the storage unit 122 decreases due to evaporation of the circulating water W2 or scattering loss, the ball tap of the water tap 137 operates, and supply water W1 flowing through the third supply water line L123 is supplied to the storage unit 122.

  The water treatment system 1 has a first drainage line L130 connected to the cooling tower 120 and a second drainage line L131 connected to the circulating water recovery line L112 as lines for discharging the circulating water W2 out of the system. The drain means for discharging the circulating water W2 from the cooling tower 120 includes a first drain line L130, a second drain line L131, and a drain valve 153.

  The first drain line L130 is configured to supply the circulating water W2 overflowing from the storage unit 122 of the cooling tower 120 when the supplementary water valve 136 is opened and the supplementary water W1 is forcibly supplied in a forced supplementary water blowdown process described later. This is a line that discharges outside the water treatment system 1. The first drain line L130 is connected to the inside of the storage unit 122 and extends downward. The upstream end of the first drain line L130 forms an overflow port 138 for the circulating water W2. The overflow port 138 is opened above the control water level of the water tap 137. On the other hand, the downstream end of the first drainage line L130 communicates with the outside of the reservoir 122.

  The makeup water valve 136 is a water supply facility that forcibly supplies the makeup water W1 to the storage section 122 by opening and closing the second makeup water line L122. The makeup water valve 136 is electrically connected to the control unit 100. The open / close state (open / closed state) of the valve body in the makeup water valve 136 is controlled by a valve drive signal output from the control unit 100.

  A drain valve 153 is provided in the second drain line L131. The drain valve 153 is electrically connected to the control unit 100. The open / close state (open / closed state) of the valve body in the drain valve 153 is controlled by a drain valve driving signal output from the control unit 100. The second drainage line L131 is a line for discharging a part of the circulating water W2 from the circulating water line L110 to the outside when the drainage valve 153 is opened in a forced drainage blowdown process described later. The second drainage line L131 is connected to the circulating water recovery line L112 at the connection portion J2. The connection part J2 is arrange | positioned between the to-be-cooled apparatus 131 and the cooling tower 120 in the circulating water collection | recovery line L112.

  The control unit 100 controls the operation of each unit in the water treatment system 1. The function of the control unit 100 is realized by a microprocessor (not shown) including a CPU and an internal memory.

  The control unit 100 is electrically connected to, for example, the circulating water pump 132, the medicine supply device 134, the makeup water valve 136, and the drain valve 153. Moreover, the control part 100 is electrically connected with each detection apparatus (The chemical | medical agent concentration sensor 133, the corrosion rate sensor 140, the flow sensor FM etc.) of the water treatment system 1, and receives detection information from these detection apparatuses.

  The controller 100 supplies the replenishment means (replenishment water valve 136, drainage valve 153), the medicine supply device 134, and the drainage means (replenishment water valve) so that the concentration of the medicine W3 detected by the medicine concentration sensor 133 becomes the reference concentration value. 136 and functions as a concentration control unit for controlling one or more of the drainage valves 153). The control unit 100 also supplies replenishing means (a replenishing water valve 136 and a draining valve 153) so that a predetermined amount of circulating water W2 is replaced when the corrosion rate detected by the corrosion rate sensor 140 exceeds a predetermined threshold. It functions as a water quality control unit that controls the drainage means (replenishment water valve 136, drainage valve 153) or controls the water treatment agent addition means (134) so that a predetermined amount of the medicine W3 is added.

An example of the function of the control unit 100 as the density control unit will be described.
The control unit 100 as the concentration control unit receives (acquires) the drug concentration M transmitted from the drug concentration sensor 133. The control unit 100 determines whether or not the received drug concentration M is below the lower limit value of the reference concentration value. When the control unit 100 determines that the drug concentration M is below the lower limit value of the reference concentration value, a “normal addition process” is performed to control the drug supply device 134 so that the drug concentration M becomes the reference concentration value. To do. In the normal addition process, for example, the control unit 100 calculates the addition amount of the drug W3 for the detected drug concentration M to be the reference concentration value, and the calculated addition amount of the drug W3 is added by the drug supply device 134. Then, the medicine supply device 134 is controlled.

  As will be described later, the control unit 100 may execute a “forced addition process” for controlling the drug supply device 134 such that the drug concentration M increases by an increase concentration ΔM from the reference concentration value. In the forcible addition process, for example, the control unit 100 calculates the amount of drug W3 added to increase the drug concentration M by an increase concentration ΔM from the reference concentration value, and the calculated amount of drug W3 is calculated as a drug supply device. The drug delivery device 134 is controlled to be added by 134.

An example of the function of the control unit 100 as the water quality control unit will be described.
The control unit 100 as the water quality control unit controls the water quality of the circulating water W2 by executing the first water quality control or the second water quality control. In the present embodiment, the first water quality control and the second water quality control are appropriately selected and executed by the control unit 100.

(First water quality control)
In the water treatment system 1 of the present embodiment, the operation of the first water quality control executed by the control unit 100 as the water quality control unit will be described with reference to the flowchart shown in FIG. FIG. 2 is a flowchart showing the operation of the first water quality control in the water treatment system 1 according to the first embodiment. The process of the flowchart shown in FIG. 2 is repeatedly executed during operation of the water treatment system 1.

  In step ST101 shown in FIG. 2, the control unit 100 determines the corrosion rate CR of the circulating water W2 detected by the corrosion rate sensor 140, the cooling tower 120 (the storage unit 122), the circulating water supply line L111, the cooled device 131, and A first corrosion rate threshold value TCR1 as a threshold value for determining whether or not corrosion of the circulating water recovery line L112 or the like is progressing is acquired from the internal memory of the control unit 100. In the present embodiment, the control unit 100 acquires the latest value of the corrosion rates continuously detected by the polarization resistance method as the corrosion rate CR.

  In step ST102, the control unit 100 determines whether or not the corrosion rate CR is equal to or higher than the first corrosion rate threshold TCR1. When it is determined that the corrosion rate CR is equal to or greater than the first corrosion rate threshold value TCR1 (YES), the process proceeds to step ST103. When it is determined that (corrosion rate CR <first corrosion rate threshold value TCR1) (NO), the process returns to step ST101.

  In step ST103 (step ST102: YES), the control unit 100 uses the control unit 100 to determine the drug concentration M detected by the drug concentration sensor 133 and the first drug concentration threshold TM1 as a threshold for determining deterioration of the agent. Obtained from 100 internal memories. The deterioration of the agent in the present embodiment means that the actual (true) concentration of the anticorrosive with respect to the circulating water W2 falls below a predetermined standard by reacting with a metal contained in the circulating water line L110 or the like. Say.

  In step ST104, the control unit 100 determines whether or not the drug concentration M is equal to or higher than the first drug concentration threshold TM1. If it is determined that drug concentration M ≧ first drug concentration threshold TM1 (YES), the process proceeds to step ST105. If it is determined that the drug concentration M <the first drug concentration threshold TM1 (NO), the process returns to step ST101.

  When corrosion rate CR ≧ first corrosion rate threshold TCR1 (step ST102: YES) and chemical concentration M ≧ first chemical concentration threshold TM1 (step ST104: YES), the corrosion rate is detected to be high. However, since the drug concentration M is detected high, it is recognized that the agent is deteriorated. On the other hand, when the corrosion rate CR ≧ the first corrosion rate threshold value TCR1 (step ST102: YES) and the drug concentration M <the first drug concentration threshold value TM1 (step ST104: NO), the drug W3 is insufficient. Therefore, the corrosion rate is detected to be high, and it is recognized that the cause of the high corrosion rate is not necessarily the deterioration of the agent.

  In step ST105, the control unit 100 executes a circulating water replacement process so that a predetermined amount of the circulating water W2 is replaced. In the present embodiment, the control unit 100 controls the drain valve 153 as a makeup water unit and a drain unit. In the present embodiment, the control unit 100 controls the drain valve 153 so that the drain valve 153 as the drain means is opened. Part of the circulating water W2 flowing through the circulating water line L110 is forcibly discharged from the second drainage line L131 of the drainage means. On the other hand, makeup water W <b> 1 is supplied to the reservoir 122 from the third makeup water line L <b> 123 of the makeup water means. Therefore, the circulating water W2 is gradually replaced with the makeup water W1. In the present embodiment, when all of the circulating water W2 is discharged from the second drain line L131 of the drainage means (that is, all the deteriorated medicine W3 is discharged), the control unit 100 causes the drainage valve 153 of the drainage means. The drain valve 153 is controlled so as to be closed.

  In step ST106, the control unit 100 executes a normal addition process so that a predetermined amount of the medicine W3 is added to the circulating water W2. In the present embodiment, the medicine supply device 134 adds to the circulating water W2 an amount of medicine W3 (predetermined amount of medicine W3) proportional to the supply amount of the makeup water W1 detected by the flow sensor FM. By the normal addition process, the concentration of the drug W3 (anticorrosive) with respect to the circulating water W2 is maintained at a predetermined reference concentration value. Thereby, the process of this flowchart is complete | finished.

(Second water quality control)
In the water treatment system 1 of this embodiment, the operation | movement of the 2nd water quality control which the control part 100 as a water quality control part performs is demonstrated with reference to the flowchart shown in FIG. The process of the flowchart shown in FIG. 3 is repeatedly executed during operation of the water treatment system 1.

  In step ST201 shown in FIG. 3, the control unit 100 detects the corrosion rate CR of the circulating water W2 detected by the corrosion rate sensor 140, the cooling tower 120 (storage unit 122), the circulating water supply line L111, the cooled device 131, and A second corrosion rate threshold value TCR2 as a threshold value for determining whether or not corrosion of the circulating water recovery line L112 or the like is progressing is acquired from the internal memory of the control unit 100. In the present embodiment, the control unit 100 acquires the latest value of the corrosion rates continuously detected by the polarization resistance method as the corrosion rate CR.

  In step ST202, the control unit 100 determines whether or not the corrosion rate CR is equal to or greater than the second corrosion rate threshold TCR2. When it is determined that the corrosion rate CR is equal to or greater than the second corrosion rate threshold value TCR2 (YES), the process proceeds to step ST203. If it is determined that (corrosion rate CR <second corrosion rate threshold value TCR2) (NO), the process returns to step ST201.

  In step ST203 (step ST202: YES), the control unit 100 determines the drug concentration M detected by the drug concentration sensor 133 and the second drug concentration threshold TM2 as a threshold for determining the deterioration of the agent. Obtained from 100 internal memories.

  In step ST204, the control unit 100 determines whether or not the drug concentration M is greater than or equal to the second drug concentration threshold TM2. If it is determined that drug concentration M ≧ second drug concentration threshold value TM2 (YES), the process proceeds to step ST205. If it is determined that the drug concentration M <the second drug concentration threshold value TM2 (NO), the process returns to step ST201.

  When corrosion rate CR ≧ second corrosion rate threshold value TCR2 (step ST202: YES) and chemical concentration M ≧ second chemical concentration threshold value TM2 (step ST204: YES), the corrosion rate is detected to be high. However, since the drug concentration M is detected high, it is recognized that the agent is deteriorated. On the other hand, if the corrosion rate CR ≧ the second corrosion rate threshold value TCR2 (step ST202: YES) and the drug concentration M <the second drug concentration threshold value TM2 (step ST204: NO), the drug W3 is insufficient. Therefore, the corrosion rate is detected to be high, and it is recognized that the cause of the high corrosion rate is not necessarily the deterioration of the agent.

  In step ST205, the control unit 100 executes a circulating water replacement process so that a predetermined amount of the circulating water W2 is replaced. In the present embodiment, the control unit 100 controls the drain valve 153 as a makeup water unit and a drain unit. In the present embodiment, the control unit 100 controls the drain valve 153 so that the drain valve 153 as the drain means is opened. Part of the circulating water W2 flowing through the circulating water line L110 is forcibly discharged from the second drainage line L131 of the drainage means. On the other hand, makeup water W <b> 1 is supplied to the reservoir 122 from the third makeup water line L <b> 123 of the makeup water means. Therefore, the circulating water W2 is gradually replaced with the makeup water W1. In the present embodiment, when all of the circulating water W2 is discharged from the second drain line L131 of the drainage means (that is, all the deteriorated medicine W3 is discharged), the control unit 100 causes the drainage valve 153 of the drainage means. The drain valve 153 is controlled so as to be closed.

  In step ST206, by performing the forced addition process, the concentration of the anticorrosive with respect to the circulating water W2 is maintained at a value higher by ΔM than the predetermined reference concentration value. Further, the tracer concentration (the drug concentration M detected by the drug concentration sensor 133) with respect to the circulating water W2 is increased by the increase concentration ΔM from the reference concentration value.

  In step ST207, the control unit 100 changes (upwards corrects) the second drug concentration threshold value TM2 as the reference concentration value to a high value (for example, a value that is higher by the increase concentration ΔM). Thereby, the process of this flowchart is complete | finished.

  By the first water quality treatment or the second water quality treatment, the control unit 100 as the water quality control unit replaces a predetermined amount of the circulating water W2 when the corrosion rate CR detected by the corrosion rate sensor 140 exceeds a predetermined value. The replenishing means (for example, the drain valve 153) and the drain means (for example, the drain valve 153) are controlled as described above, or the medicine supply device 134 is controlled so that a predetermined amount of the medicine W3 is added. In the present embodiment, the control unit 100 as the water quality control unit has a corrosion rate CR detected by the corrosion rate sensor 140 that exceeds the first corrosion rate threshold value TCR1 or the second corrosion rate threshold value TCR2, and the chemical concentration sensor 133. When the drug concentration M detected in (1) exceeds the first drug concentration threshold value TM1 or the second drug concentration threshold value TM2, a replenishing means (for example, a drain valve 153) and a drain means ( For example, the drain valve 153) is controlled. Further, the control unit 100 as the water quality control unit detects that the corrosion rate CR detected by the corrosion rate sensor 140 exceeds the first corrosion rate threshold value TCR1 or the second corrosion rate threshold value TCR2 and is detected by the chemical concentration sensor 133. When the drug concentration M exceeds the first drug concentration threshold value TM1 or the second drug concentration threshold value TM2, the drug supply device 134 is controlled so that a predetermined amount of the drug W3 is added.

  As described above, the first water quality control and the second water quality control are executed by appropriately selecting one. The first water quality control is different from the normal addition process in the second water quality control in that the forced addition process is performed. In addition, the first water quality control and the second water quality control differ in whether or not the drug concentration threshold (second drug concentration threshold TM2) is changed. In the first water quality control, the first corrosion rate threshold value TCR1 is a threshold value for the first water quality control, whereas in the second water quality control, the second corrosion rate threshold value TCR2 is a threshold value for the second water quality control. The point is different.

  When the control unit 100 executes the second water quality control, the control unit 100 changes the drug concentration threshold (second drug concentration threshold TM2), so that the drug concentration threshold (second drug concentration threshold) is used as the reference concentration value. Even if TM2) is not set to an appropriate value, the second drug concentration threshold value TM2 as the reference concentration value is changed to a higher value (for example, a value higher by the increased concentration ΔM) (upward correction) The second water quality control at the newly set (upward correction) management concentration can be executed.

  When the control unit 100 executes the second water quality control, the forced addition process is performed, so that more medicine W3 is added to the circulating water W2 than the normal addition process. Therefore, the corrosion rate can be greatly reduced. Therefore, the second corrosion rate CR2 that is the threshold value for the second water quality control can be set to a value that is higher than, for example, the first corrosion rate CR1 that is the threshold value for the first water quality control. In addition, the frequency where 2nd water quality treatment control is performed becomes low, and it can suppress that circulating water replacement processing is performed frequently, so that 2nd corrosion rate CR2 used as the threshold value of 2 water quality control is set to a high value. According to this, the control part 100 can perform the 2nd water quality process by the newly set management density | concentration, suppressing the frequency of a circulating water replacement process. In addition, it is not limited to these, The 1st corrosion rate threshold value TCR1 and the 2nd corrosion rate threshold value TCR2 may be set suitably.

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

  The water treatment system 1 of the first embodiment includes a cooling tower 120 that cools the circulating water W2 to be supplied to the cooled apparatus 131 and the circulating water W2 that is returned from the cooled apparatus 131, and the circulating water W2 is cooled to the cooling tower 120. A circulating water line L110 that circulates between the cooling device 131 and the cooled device 131, a replenishing means that supplies the replenishing water W1 to the circulating water W2 (a replenishing water line L120, a replenishing water valve 136, etc.), and a chemical W3 to the circulating water W2. Drug supply device 134 to be added, drainage means (first drainage line L130, second drainage line L131, drainage valve 153, etc.) for discharging circulating water W2 from cooling tower 120, and drug concentration sensor 133 for detecting drug concentration M And a corrosion rate sensor 140 that detects the corrosion rate CR of the cooling tower 120. Further, the control unit 100 as the concentration control unit controls, for example, the water treatment agent adding means (the drug supply device 134) so that the drug concentration M detected by the drug concentration sensor 133 becomes the reference concentration value. In addition, the control unit 100 as a water quality control unit supplies replenishing means (for example, a drain valve) so that a predetermined amount of circulating water W2 is replaced when the corrosion rate CR detected by the corrosion rate sensor 140 exceeds a predetermined value. 153) and the drainage means (for example, drainage valve 153), or the medicine supply device 134 is controlled so that a predetermined amount of medicine W3 is added.

  Therefore, the control part 100 can detect the fall of the density | concentration of the anticorrosive with respect to the circulating water W2 as an increase in the corrosion rate CR, and can perform a 1st water quality process or a 2nd water quality process. According to this, the density | concentration of the anticorrosive with respect to the circulating water W2 can be managed easily.

  The drug W3 added by the drug supply device 134 includes a fluorescent tracer, and the drug concentration sensor 133 as a concentration detection unit detects the drug concentration M based on the concentration of the fluorescent tracer with respect to the circulating water W2. According to this, the drug concentration M can be detected more accurately.

  When a corrosion rate sensor made of copper (Cu) is used as the corrosion rate sensor 140, the corrosion rate of copper (Cu) in the cooling tower 120 can be detected more accurately.

  Further, when a corrosion rate sensor made of iron (Fe) is used as the corrosion rate sensor 140, the corrosion rate of iron (Fe) in the cooling tower 120 can be detected more accurately.

(Second Embodiment)
A water treatment system according to a second embodiment of the present invention will be described. FIG. 4 is a schematic configuration diagram showing a water treatment system 1A according to the second embodiment. In the second embodiment, differences from the first embodiment will be mainly described. In the second embodiment, the same or equivalent components as those in the first embodiment will be described with the same reference numerals. In the second embodiment, the description overlapping with the first embodiment is omitted as appropriate.

  As shown in FIG. 4, the water treatment system 1 </ b> A according to the second embodiment has, as a main configuration, a first electrical conductivity sensor EC <b> 1 as a concentration detection unit and a drug concentration sensor 133 as a concentration detection unit. The point provided with 2nd electrical conductivity sensor EC2 differs from the water treatment system 1 which concerns on 1st Embodiment.

  The first electrical conductivity sensor EC1 is a device that detects the electrical conductivity of the circulating water W2 flowing through the circulating water line L110 and outputs the detected electrical conductivity as the first detected electrical conductivity E1. The first electrical conductivity sensor EC1 is connected to the circulating water supply line L111. The first electrical conductivity sensor EC1 detects the electrical conductivity of the circulating water W2 flowing between the circulating water pump 132 and the cooled device 131 at a predetermined time interval (or real time). The first electrical conductivity sensor EC1 is electrically connected to, for example, the second electrical conductivity sensor EC2, the flow rate sensor FM, and the control unit 100.

  The second electrical conductivity sensor EC2 is a device that detects the electrical conductivity of the circulating water W2 flowing through the makeup water line L120 and outputs the detected electrical conductivity as the second detected electrical conductivity E2. The second electrical conductivity sensor EC2 is connected to the first makeup water line L121. The second electrical conductivity sensor EC2 detects the electrical conductivity of the makeup water W1 flowing between the supply source (not shown) of the makeup water W1 and the flow rate sensor FM at a predetermined time interval (or real time). The second electrical conductivity sensor EC2 is electrically connected to, for example, the first electrical conductivity sensor EC1, the flow rate sensor FM, and the control unit 100.

  Further, the medicine W3A according to the second embodiment is different from the medicine W3 according to the first embodiment in that a fluorescent tracer is not included.

The concentration detection means of the water treatment system 1A according to the second embodiment will be described.
In the water treatment system 1A according to the second embodiment, the first electrical conductivity sensor EC1 and the second electrical conductivity sensor EC2 are electrically connected to each other, and in cooperation, the concentration magnification detection unit and the concentration detection unit. Function as. The first electrical conductivity sensor EC1 and the second electrical conductivity sensor EC2 have a function equivalent to that of the drug concentration sensor 133 according to the first embodiment. Specifically, the first electrical conductivity sensor EC1 and the second electrical conductivity sensor EC2 as the concentration detection means are supplied with the supply amount of the makeup water W1 detected by the flow sensor FM and the first electrical conductivity sensor as the concentration ratio detection means. Based on the concentration rate of the circulating water W2 detected by the conductivity sensor EC1 and the second electrical conductivity sensor EC2, the concentration of the drug W3A (drug concentration M) with respect to the circulating water W2 is detected.

The first electrical conductivity sensor EC1 and the second electrical conductivity sensor EC2 as the concentration magnification detecting means detect the concentration magnification N of the circulating water W2. For example, the first electrical conductivity sensor EC1 and the second electrical conductivity sensor EC2 calculate the concentration factor N of the circulating water W2 based on the following formula (1).
N = E1 ÷ E2 (1)
N: Concentration magnification of circulating water W2 [−]
E1: First detected electric conductivity [mS / m]
E2: Second detected electric conductivity [mS / m]

Further, the first electrical conductivity sensor EC1 and the second electrical conductivity sensor EC2 as the concentration detection means calculate the drug concentration M based on the supply amount of the makeup water W1 detected by the flow sensor FM and the concentration factor N. To detect. For example, the first electrical conductivity sensor EC1 and the second electrical conductivity sensor EC2 calculate the drug concentration M based on the following formula (2).
M = W × D × N ÷ V (2)
M: Concentration of anticorrosive to circulating water W2 [mg / L]
W: Amount of drug W3A input [mL]
D: Density of anticorrosive agent against drug W3A [mg / mL]
N: Concentration magnification of circulating water W2 [−]
V: Supply amount of makeup water W1 [L]

  The control unit 100 stores the drug concentration M detected by the first electric conductivity sensor EC1 and the second electric conductivity sensor EC2.

  In addition, in the water treatment system 1A according to the second embodiment, normal addition processing, forced addition processing, first water quality control, second water quality control, and the like equivalent to the water treatment system 1 according to the first embodiment are executed.

  The water treatment system 1A according to the second embodiment described above includes a flow rate sensor FM that detects the supply amount of the makeup water W1, and a first electrical conductivity sensor EC1 as a concentration magnification detection unit that detects a concentration factor of the circulating water W2. And the second electrical conductivity sensor EC2, and the drug supply device 134 adds the drug W3A in an amount proportional to the supply amount of the makeup water W1 detected by the flow sensor FM to the circulating water W2. The first electrical conductivity sensor EC1 and the second electrical conductivity sensor EC2 as detection means include the supply amount of the makeup water W1 detected by the flow sensor FM, the first electrical conductivity sensor EC1 as the concentration factor detection means, and Based on the concentration rate of the circulating water W2 detected by the second electrical conductivity sensor EC2, the concentration of the medicine W3A with respect to the circulating water W2 is detected.

According to the water treatment system 1A of the second embodiment, the same effect as the water treatment system 1 according to the first embodiment is exhibited.
Furthermore, according to the water treatment system 1A of the second embodiment, compared to the water treatment system 1 according to the first embodiment, it is not necessary to install the drug concentration sensor 133, and the drug W3A includes a fluorescent tracer. This eliminates the need to reduce the costs associated with the introduction and maintenance of the water treatment system 1A.

  In addition, in the water treatment system 1A of the second embodiment, when the circulating water W2 circulates in a state where the load of the apparatus to be cooled 131 is low (in winter, etc.), the concentration detection means sets the concentration magnification to 1 and the drug concentration M May be detected. In this case, since it is not necessary to install the first electrical conductivity sensor EC1 and the second electrical conductivity sensor EC2, costs associated with the introduction and maintenance of the water treatment system 1A can be further reduced.

(Third embodiment)
A water treatment system according to a third embodiment of the present invention will be described. In the third embodiment, differences from the first embodiment will be mainly described. In the third embodiment, the same or equivalent components as those in the first embodiment will be described with the same reference numerals. In the third embodiment, the description overlapping with that of the first embodiment is omitted as appropriate.

  The water treatment system according to the third embodiment is different from the water treatment system 1 according to the first embodiment in that the control unit 100 as a water quality control unit executes the third water quality control. In addition, it can be said that the 3rd water quality control performed in 3rd Embodiment performs the 1st water quality control and 2nd water quality control performed in 1st Embodiment in series. Specifically, in the third water quality control executed in the third embodiment, the chemical management concentration in the first water quality control is set to a low value, and a decrease in the corrosion rate is also recognized by the replacement process of the circulating water. If not, it can be said that the forced addition process similar to the second water quality control is executed.

(Third water quality control)
The operation | movement of the 3rd water quality control which the control part 100 as a water quality control part performs in the water treatment system which concerns on 3rd Embodiment is demonstrated with reference to the flowchart shown in FIG. FIG. 5 is a flowchart showing the operation of the third water quality control in the water treatment system according to the third embodiment. The process of the flowchart shown in FIG. 5 is repeatedly executed during operation of the water treatment system according to the third embodiment.

  In step ST301 shown in FIG. 5, the control unit 100 detects the first corrosion rate CR1 of the circulating water W2 detected by the corrosion rate sensor 140, the cooling tower 120 (reservoir 122), the circulating water supply line L111, and the apparatus to be cooled. 131 and the first corrosion rate threshold value TCR1 as a threshold value for determining whether or not the corrosion of the circulating water recovery line L112 or the like is progressing are acquired from the internal memory of the control unit 100. In the present embodiment, the control unit 100 acquires the latest value among the corrosion rates continuously detected by the polarization resistance method as the first corrosion rate threshold TCR1.

  In step ST302, the control unit 100 determines whether or not the first corrosion rate CR1 is equal to or greater than the first corrosion rate threshold TCR1. If it is determined that the first corrosion rate CR1 ≧ the first corrosion rate threshold value TCR1 (YES), the process proceeds to step ST303. If it is determined that (first corrosion rate CR1 <first corrosion rate threshold TCR1) (NO), the process returns to step ST301.

  In step ST303 (step ST302: YES), the control unit 100 displays the drug concentration M detected by the drug concentration sensor 133 and the third drug concentration threshold TM3 as a threshold for determining the deterioration of the agent. Obtained from 100 internal memories.

  In step ST304, the control unit 100 determines whether or not the drug concentration M is greater than or equal to the third drug concentration threshold value TM3. If it is determined that drug concentration M ≧ third drug concentration threshold value TM3 (YES), the process proceeds to step ST305. If it is determined that the drug concentration M <the third drug concentration threshold value TM3 (NO), the process returns to step ST301.

  In step ST305, the control unit 100 executes a circulating water replacement process so that a predetermined amount of the circulating water W2 is replaced. In the present embodiment, the control unit 100 controls the drain valve 153 as a makeup water unit and a drain unit. In the present embodiment, the control unit 100 controls the drain valve 153 so that the drain valve 153 as the drain means is opened. Part of the circulating water W2 flowing through the circulating water line L110 is forcibly discharged from the second drainage line L131 of the drainage means. On the other hand, makeup water W <b> 1 is supplied to the reservoir 122 from the third makeup water line L <b> 123 of the makeup water means. Therefore, the circulating water W2 is gradually replaced with the makeup water W1. In the present embodiment, when all of the circulating water W2 is discharged from the second drain line L131 of the drainage means (that is, all the deteriorated medicine W3 is discharged), the control unit 100 causes the drainage valve 153 of the drainage means. The drain valve 153 is controlled so as to be closed.

  In step ST306, the control unit 100 uses the second corrosion rate CR2 of the circulating water W2 newly detected by the corrosion rate sensor 140 and a threshold for determining whether or not the reference concentration value is an appropriate value. The second corrosion rate threshold value TCR2 is acquired from the internal memory of the control unit 100. In the present embodiment, the control unit 100 acquires the latest value among the corrosion rates continuously detected by the polarization resistance method as the second corrosion rate threshold TCR2.

  In step ST307, the control unit 100 determines whether or not the second corrosion rate CR2 is equal to or less than the second corrosion rate threshold TCR2. If it is determined that second corrosion rate CR2 ≦ second corrosion rate threshold TCR2 (YES), the process proceeds to step ST308. If it is determined that the second corrosion rate CR2> the second corrosion rate threshold TCR2 (NO), the process proceeds to step ST310.

  In step ST308 (step ST307: YES), the control unit 100 executes a normal addition process so that a predetermined amount of the medicine W3 is added to the circulating water W2. In the present embodiment, the medicine supply device 134 adds to the circulating water W2 an amount of medicine W3 (predetermined amount of medicine W3) proportional to the supply amount of the makeup water W1 detected by the flow sensor FM. By the normal addition process, the concentration of the drug W3 (anticorrosive) with respect to the circulating water W2 is maintained at a predetermined reference concentration value. Thereby, the process of this flowchart is complete | finished.

  In step ST309 (step ST307: NO), the control unit 100 executes the forcible addition process so that a predetermined amount of the medicine W3 is added to the circulating water W2. In the present embodiment, the control unit 100 calculates, as a predetermined amount of drug W3, the amount of drug W3 added for increasing the drug concentration M by an increase concentration ΔM from the reference concentration value. Further, the medicine supply device 134 adds the calculated amount of medicine W3 (predetermined amount of medicine W3) to the circulating water W2. By adding a predetermined amount of drug W3 to the circulating water W2, the drug concentration M increases by an increase concentration ΔM from the reference concentration value.

  In step ST309, the forced addition process is executed, so that the concentration of the anticorrosive with respect to the circulating water W2 is maintained at a predetermined reference concentration value. On the other hand, the tracer concentration (the drug concentration M detected by the drug concentration sensor 133) with respect to the circulating water W2 increases by an increase concentration ΔM from the reference concentration value.

  In step ST310, the control unit 100 determines whether the reference concentration value has been set to an appropriate value, and sets the third drug concentration threshold value TM3 as the reference concentration value to a high value (for example, a value that is higher by the increase concentration ΔM). Change to (upward correction). Thereby, the process of this flowchart is complete | finished.

  According to the water treatment system which concerns on 3rd Embodiment mentioned above, there exists an effect similar to the water treatment system 1 which concerns on 1st Embodiment.

  Moreover, the control part 100 in 3rd Embodiment determines whether the chemical | medical agent density | concentration M is more than 3rd chemical | medical agent concentration threshold value TM3 (step ST304). The third drug concentration threshold value TM3 is a value that is appropriately changed (upward correction) (step ST304). Thereby, the control part 100 can perform a 3rd water quality process based on the optimal chemical | medical agent concentration threshold value (3rd chemical | medical agent concentration threshold value TM3).

  Moreover, when the control part 100 in 3rd Embodiment performs 3rd water quality control, since the control part 100 changes a chemical | medical agent concentration threshold value (3rd chemical | medical agent concentration threshold value TM3), the chemical | medical agent density | concentration as a reference | standard density | concentration value If the threshold value (third drug concentration threshold value TM3) is not set to an appropriate value, the third drug concentration threshold value TM3 as the reference concentration value is changed to a high value (for example, a value that is higher by the increase concentration ΔM) ( The third water quality control can be executed with the management concentration newly set (upward correction) and newly set (upward correction).

  Moreover, when the control part 100 in 3rd Embodiment performs 3rd water quality control, when it determines with 2nd corrosion rate CR2 not falling below 2nd corrosion rate threshold value TCR2 (step ST307: NO). The forced addition process is executed (step ST309). In the forced addition process, a larger amount of medicine W3 is added to the circulating water W2 than in the normal addition process. Therefore, the corrosion rate can be greatly reduced. Therefore, for example, the first corrosion rate CR1 that is the threshold value for the third water quality control can be set to a high value. In addition, the frequency with which 3rd water quality process control is performed becomes low, and it can suppress that a circulating water replacement process is performed frequently, so that 3rd corrosion rate CR3 used as the threshold value of 3 water quality control is set to a high value. According to this, the control part 100 can perform the 3rd water quality process by the newly set management density | concentration, suppressing the frequency of a circulating water replacement process.

  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, an example in which the chemical supply device 134 supplies a water treatment agent such as an anticorrosive to the circulating water W2 has been described. However, the water treatment agent supplied to the circulating water W2 is not limited to the anticorrosive agent. The water treatment agent supplied to the circulating water W2 may be a scale dispersant or an antislime agent. Further, an apparatus different from the chemical supply apparatus 134 may supply the scale dispersant and the slime inhibitor to the circulating water W2.

  Moreover, the example which the control part 100 functions as a density | concentration control part and a water quality control part independently was demonstrated. However, the control unit 100 and other control units may function in cooperation with each other as a concentration control unit and a water quality control unit. For example, a control device (not shown) installed inside the medicine supply device 134 may execute processing (normal addition processing, forced addition processing) for supplying the medicine W3 to the circulating water W2.

  Moreover, although the corrosion rate sensor 140 demonstrated the example which detects the corrosion rate CR by a polarization resistance method, you may detect a corrosion rate by another method irrespective of a polarization resistance method. For example, the corrosion rate sensor 140 may detect the corrosion rate CR by an electrical detection method such as an electric resistance method and an electrochemical noise method, or a detection method using a test piece. In addition, the corrosion rate CR can be continuously detected with high accuracy in real time by using an electrical detection method.

  Moreover, the control part 100 as a density | concentration control part demonstrated the example which controls the chemical | medical agent supply apparatus 134 so that the chemical | medical agent density | concentration M detected by the chemical | medical agent concentration sensor 133 may become a reference | standard density | concentration value. Without being limited thereto, the control unit 100 may control other means so that the drug concentration M becomes the reference concentration value. Specifically, the control unit 100 controls the replenishing water means (replenishing water valve 136 and drainage valve 153) or the draining means (replenishing water valve 136 and drainage valve 153) so that the drug concentration M becomes the reference value. Also good. Further, the control unit 100 supplies the replenishing water means (replenishing water valve 136 and drainage valve 153), the medicine supply device 134 and the draining means (replenishing water valve 136 and drainage valve 153) so that the drug concentration M becomes the reference concentration value. The drug concentration M may be set to the reference value by controlling any two or more of the above.

  Moreover, the control part 100 as a water quality control part may perform 1st water quality control, 2nd water quality control, and 3rd water quality control, without acquiring the chemical | medical agent density | concentration M. For example, when the corrosion rate CR shows an abnormally high value as an emergency means, the circulating water replacement process or the like may be executed without acquiring the drug concentration M.

  Further, in the first water quality control, the second water quality control, and the third water quality control, the control unit 100 as the water quality control unit has a predetermined value when the corrosion rate CR detected by the corrosion rate sensor 140 exceeds a predetermined value. The replenishing means (for example, the drain valve 153) and the drain means (for example, the drain valve 153) are controlled so that the amount of circulating water W2 is replaced, and the medicine supply device 134 is added so that a predetermined amount of the medicine W3 is added. An example of controlling the above has been described. The control unit 100 as the water quality control unit is not limited to this, and the replenishing means (a replenishing unit (2) so that a predetermined amount of the circulating water W2 is replaced when the corrosion rate CR detected by the corrosion rate sensor 140 exceeds a predetermined value. For example, the drainage valve 153) and the drainage means (for example, the drainage valve 153) are controlled, but the drug supply apparatus 134 may not be controlled, or the drug supply apparatus is added so that a predetermined amount of the drug W3 is added. Although 134 is controlled, it is not necessary to control the replenishing means and the draining means.

  In the first water quality control, the second water quality control, and the third water quality control, the control unit 100 as the water quality control unit executes the circulating water replacement process by controlling the drain valve 153 as the makeup water unit and the drain unit. The example to do was demonstrated. It is not limited to this, The control part 100 may perform a circulating water replacement | exchange process by controlling another means. For example, the control unit 100 may perform the circulating water replacement process by controlling the makeup water valve 136 as the makeup water means and the drainage means.

  Further, the replenishing means may be installed in the circulating water line L110 (the circulating water supply line L111, the circulating water recovery line L112) or the cooled device 131. Further, the drainage means may be installed in the circulating water supply line L111 or the apparatus to be cooled 131. Further, the corrosion rate detection means may be installed in the circulating water line L110 (the circulating water supply line L111, the circulating water recovery line L112) or the cooled device 131.

  Further, the corrosion rate CR detected by the corrosion rate sensor 140 in the first embodiment is not the corrosion rate CR of the cooling tower 120, but may be, for example, the corrosion rate CR of the cooled device 131 or the circulating water line L110. .

  Further, an example in which a corrosion rate sensor made of copper (Cu) or a corrosion rate sensor made of iron (Fe) is used as the corrosion rate sensor 140 has been described. However, the corrosion rate sensor 140 may not be a corrosion rate sensor made of copper (Cu) or a corrosion rate sensor made of iron (Fe). Further, as the corrosion rate sensor 140, a copper (Cu) sensor and an iron (Fe) corrosion rate sensor may be used in combination. In this case, the control unit 100 sets a high value among the copper sensor corrosion rate detected by the copper (Cu) corrosion rate sensor and the iron sensor corrosion rate detected by the iron (Fe) corrosion rate sensor. Based on the indicated corrosion rate, the first water quality control, the second water quality control, and the third water quality control may be executed.

  In the first water quality control, the second water quality process, and the third water quality process, the example in which all of the circulating water W2 is replaced with the makeup water W1 by the circulating water replacement process has been described. However, not all of the circulating water W2 is necessarily replaced with the makeup water W1 by the circulating water replacement process. For example, half of the total amount of the circulating water W2 may be replaced with the makeup water W1 by the circulating water replacement process.

  Further, the drug concentration sensor 133 in the first embodiment does not need to be connected to the bottom of the storage unit 122 as long as it can detect the fluorescent tracer concentration of the circulating water W2, and is connected to the circulating water supply line L111, for example. It may be.

  Further, the first electrical conductivity sensor EC1 in the second embodiment does not need to be connected to the circulating water supply line L111 as long as the electrical conductivity of the circulating water W2 can be detected. It may be connected to. Similarly, the second electrical conductivity sensor EC2 need not be connected to the first makeup water line L121 as long as it can detect the electrical conductivity of the makeup water W1, for example, connected to the second makeup water line L122. May be.

  Further, the example in which the medicine supply device 134 performs the normal addition process in which the medicine W3 is added to the circulating water W2 in an amount proportional to the supply amount of the makeup water W1 detected by the flow sensor FM has been described. In other words, the example in which the medicine supply device 134 adds the medicine W3 to the circulating water W2 based on the supply amount of the makeup water W1 detected by the flow sensor FM has been described. Without being limited thereto, the medicine supply device 134 may add the medicine W3 to the circulating water W2 without depending on the supply amount of the makeup water W1 detected by the flow sensor FM.

  In the first embodiment, the example in which the drug concentration sensor 133 detects (calculates) the drug concentration M has been described. Similarly, the first electrical conductivity sensor EC1 and the second electrical conductivity sensor EC2 in the second embodiment have been described with respect to the example in which the drug concentration M is detected (calculated). However, the device for calculating the drug concentration M is not limited to the drug concentration sensor 133 and the electric conductivity sensors (the first electric conductivity sensor EC1 and the second electric conductivity sensor EC2). For example, the control unit 100 may perform calculation based on the fluorescence tracer concentration detected by the drug concentration sensor 133, or a calculation device other than the control unit 100 may perform calculation.

1 Water treatment system 100 Control unit (concentration control unit, water quality control unit)
120 Cooling tower 131 Cooled device 133 Drug concentration sensor (concentration detection means)
134 Drug supply device (water treatment agent addition means)
136 Supply water valve (Supplying means, draining means)
140 Corrosion rate sensor (corrosion rate detection means)
153 Drain valve (drainage means)
FM Flow sensor (Supply water supply amount detection means)
EC1 first electrical conductivity sensor (concentration magnification detection means, concentration detection means)
EC2 Second electrical conductivity sensor (concentration magnification detection means, concentration detection means)
L110 Circulating water line L120 Makeup water line (Supplying means)
L130 1st drainage line (drainage means)
L131 Second drainage line (drainage means)
W1 makeup water W2 circulating water W3, W3A medicine

Claims (5)

A cooling tower for cooling the circulating water to be supplied to the cooled apparatus and the circulating water returned from the cooled apparatus;
A circulating water line for circulating circulating water between the cooling tower and the cooled device;
Replenishment means for supplying makeup water to the circulating water;
Water treatment agent addition means for adding a water treatment agent to the circulating water;
Drainage means for discharging circulating water from the cooling tower, the circulating water line or the cooled device;
Concentration detecting means for detecting the concentration of the water treatment agent relative to the circulating water;
Corrosion rate detection means for detecting the corrosion rate of the cooling tower, the circulating water line or the cooled device;
A concentration control unit that controls one or more of the replenishing means, the water treatment agent adding means, and the draining means so that the concentration of the water treatment agent detected by the concentration detection means becomes a reference concentration value;
When the corrosion rate detected by the corrosion rate detection unit exceeds a predetermined threshold, the replenishment unit and the drainage unit are controlled so that a predetermined amount of circulating water is replaced, or a predetermined amount of water treatment is performed. A water treatment system comprising: a water quality control unit that controls the water treatment agent addition means so that the agent is added. The water treatment agent added by the water treatment agent addition means includes a fluorescent tracer,
The water treatment system according to claim 1, wherein the concentration detection means detects the concentration of the water treatment agent with respect to the circulating water based on the concentration of the fluorescent tracer with respect to the circulating water. A makeup water supply amount detecting means for detecting a makeup water supply amount;
A concentration magnification detecting means for detecting the concentration rate of circulating water;
The water treatment agent adding means adds, to the circulating water, an amount of water treatment agent proportional to the supply amount of makeup water detected by the makeup water supply amount detection means,
The concentration detection means is configured to supply a water treatment agent for circulating water based on a supply amount of makeup water detected by the makeup water supply amount detection means and a concentration ratio of circulating water detected by the concentration magnification detection means. The water treatment system of Claim 1 or 2 which detects a density | concentration.   The said corrosion rate detection means is a water treatment system in any one of Claims 1-3 which detects the corrosion rate of at least copper among the metals contained in the said cooling tower, the said circulating water line, or the said to-be-cooled apparatus.   The said corrosion rate detection means is a water treatment system in any one of Claims 1-4 which detects the corrosion rate of at least iron among the metals contained in the said cooling tower, the said circulating water line, or the said to-be-cooled apparatus.

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