JP2014061494A - Water treatment system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water treatment system that suppresses wasteful consumption of a chemical agent by blowing processing executed during chemical-feeding processing.SOLUTION: A water treatment system includes: industrial equipment; chemical agent supply means 134; water quality detection means 133; flow rate detection means 135; blowing means; a blowing processing control part 201; a chemical agent supply control part 202; and a storage part 300. The chemical agent supply control part 202 (i) makes chemical agent supply processing stand by during execution of blowing processing and executes the chemical agent supply processing after execution of the blowing processing so as to supply the industrial equipment with a chemical agent of the necessary charge amount caused by the blowing processing, and (ii) if next blowing processing is executed during execution of the chemical agent supply processing, interrupts execution of the chemical agent supply processing and executes the chemical agent supply processing after execution of the next blowing process so as to supply the industrial equipment with the chemical agent of the total amount of the charge amount which is not supplied to the industrial equipment in the chemical agent supply processing and the necessary charge amount caused by the next blowing processing.

Description

  The present invention relates to a water treatment system provided with industrial equipment having a circulating water system.

  Conventionally, various industrial facilities having a circulating water system are installed in commercial buildings, industrial plants, and the like. For example, a cooling tower is known as an industrial facility having a circulating water system. In the water treatment system provided with this cooling tower, 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”). In the water treatment system, the circulating water circulates between the cooling tower and the apparatus to be cooled via the circulating water system.

  A part of the circulating water evaporates when it is cooled by the cooling tower. Therefore, when circulating water is continuously circulated, the concentration of circulating water gradually increases and the water quality deteriorates. Therefore, in order to improve the quality of the circulating water, fresh water (makeup water) is regularly replenished from the outside, and a part of the highly concentrated circulating water is discharged outside to dilute the circulating water. A so-called blow process is performed. Also, a process of supplying chemicals such as scale inhibitors and anticorrosives to the circulating water or make-up water (hereinafter also referred to as “medicine injection process”) is also executed.

  Conventionally, in order to reduce waste of the medicine to be supplied, a water treatment system that does not perform a chemical injection process during a blow process and performs a chemical injection process with a chemical input amount proportional to the execution time of the blow process after the blow process is executed. Has been proposed (see Patent Documents 1 and 2).

Japanese Patent Laid-Open No. 11-63746 JP 2011-247447 A

  The conventional water treatment system described above is characterized in that the chemical injection process is stopped during the blow process. However, after the blow process is executed, the next blow process may be executed while the stopped chemical injection process is being executed. In that case, in the conventional water treatment system, in the next blow process, the medicine supplied by the chemical injection process is immediately discharged out of the system together with a part of the circulating water, which may cause waste of the medicine. .

  Therefore, an object of this invention is to provide the water treatment system which can suppress that a chemical | medical agent is wastefully consumed by the blow process started during execution of the stopped chemical injection process.

  The present invention includes industrial equipment having a circulating water system, flow rate detection means for outputting the amount of makeup water supplied to the industrial equipment as a detected water quantity value, and chemical supply processing for supplying medicine to the industrial equipment. A feasible medicine supply means, a water quality detection means for outputting the quality of the water flowing through the circulating water system of the industrial facility as a detected water quality value, and discharging a part of the water flowing through the circulating water system from within the industrial equipment In addition, a blow unit capable of performing a blow process for supplying makeup water from the outside into the industrial facility, and a blow process in the blow unit according to a detected water quality value output from the water quality detection unit In the medicine supply means, the medicine supply means supplies the medicine in an amount proportional to the detected water amount output from the blow processing control section and the flow rate detection means to the industrial equipment. A medicine supply control unit that executes the operation, and a storage unit that stores an amount of the medicine that has not been supplied from the medicine supply unit to the industrial facility in the medicine supply process, (I) If the blow process is being executed, the execution of the medicine supply process is waited and, after the blow process is executed, the input amount proportional to the detected water amount value detected during the execution period of the blow process In the case where the chemical supply process is performed in the chemical supply means so that the chemical is supplied to the industrial facility, and (ii) the next blow process is performed during the execution of the chemical supply process The execution of the medicine supply process is interrupted, and the amount of medicine that has not been supplied to the industrial equipment in the medicine supply process is stored in the storage unit, and after the next blow process is executed. A total amount of medicine stored in the storage unit and the amount of medicine input proportional to the detected water amount detected during the execution period of the next blow processing is added to the industrial facility. It is related with the water treatment system which makes the said chemical | medical agent supply means perform the said chemical | medical agent supply process so that it may be supplied.

  In addition, the medicine supply control unit is in the medicine supply means when the industrial equipment is in operation and the period during which makeup water is not supplied to the industrial equipment exceeds a preset allowable period. It is preferable to execute the medicine supply process.

  Moreover, it is preferable that the said chemical | medical agent supply means supplies a disinfectant as a chemical | medical agent supplied to the said industrial equipment in the said chemical | medical agent supply process.

In addition, the medicine supply control unit determines the amount of medicine input,
It is preferable to calculate based on the formula: amount of drug input = detected water amount value of makeup water × drug maintenance concentration / concentration ratio of circulating water / drug specific gravity.

The industrial facility is a cooling tower that is supplied with makeup water, cools the makeup water as circulating water, and supplies the cooled circulating water to the apparatus to be cooled. The first electrical conductivity detecting means for outputting the electrical conductivity of the water as the first detected electrical conductivity value, and the second electrical conductivity detecting means for outputting the electrical conductivity of the makeup water as the second detected electrical conductivity value. The drug supply control unit further includes the concentration rate of the circulating water,
It is preferable to calculate based on the formula of concentration ratio = first detected electrical conductivity value / second detected electrical conductivity value.

  ADVANTAGE OF THE INVENTION According to this invention, the water treatment system which can suppress that a chemical | medical agent is consumed wastefully by the blow process started during execution of the stopped chemical injection process can be provided.

It is a schematic structure figure showing water treatment system 1 of an embodiment. It is a functional block diagram concerning control of water treatment system 1 of an embodiment. It is a time chart which shows the timing which performs a chemical injection process in the water treatment system. It is a time chart which shows the place timing which performs an auxiliary | assistant medicine injection process in the water treatment system. 5 is a flowchart showing a processing procedure when control of blow processing is executed in the control unit 200. It is a flowchart which shows the process sequence in the case of performing control of a chemical injection process in the control part 200. FIG. It is a flowchart which shows the process sequence in the case of performing control of an auxiliary | assistant medicine injection process in the control part 200. FIG. It is a flowchart which shows the process sequence in the case of performing control of an auxiliary | assistant medicine injection process in the control part 200. FIG.

  Hereinafter, the schematic configuration of the water treatment system 1 of the present embodiment will be described with reference to the drawings. Drawing 1 is a schematic structure figure showing water treatment system 1 of this embodiment. FIG. 2 is a functional block diagram relating to the control of the water treatment system 1.

  As shown in FIG. 1, the water treatment system 1 of this embodiment circulates circulating 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 to let you. 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 as an industrial facility 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, a cooled device 131, a first electrical conductivity sensor 133 as water quality detection means (first electrical conductivity detection means), and a chemical agent. A drug supply device 134 as a supply unit, a flow rate sensor 135 as a flow rate detection unit, a second electrical conductivity sensor 139 as a second electrical conductivity detection unit, and a system control device 100 are provided. The water treatment system 1 includes a circulating water line L110 as a circulating water system and a makeup water line L120 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. Moreover, in FIG. 1, the path | route of electrical connection is shown with the broken line.

  The cooling tower 120 is a facility for supplying the makeup water W1, supplying the makeup water W1 as the circulating water W2 to the cooled device 131, and cooling the circulating water W2 collected (returned) from the cooled device 131. is there. The cooling tower 120 includes a tower main body 121 and a storage unit 122. Moreover, the cooling tower 120 comprises a circulating water system with the circulating water line L110.

  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, and the like. The circulating water W2 is cooled by the circulating water cooling unit and falls into the storage unit 122. A storage part 122 is provided in the lower part of the tower main body 121.

  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 supply line L111 (described later) of the circulating water line L110 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. The storage unit 122 is provided with a water tap 137 and an inflow port 138 as blow means described later.

  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 between the storage unit 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. The circulating water pump 132 can send out 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 system control device 100. The operation (drive and stop) of the circulating water pump 132 is controlled by a pump operation signal output from the system control device 100.

  The circulating water recovery line L112 is a line that connects between the cooled device 131 and the cooling tower 120. The circulating water W2 heated by heat exchange in the apparatus to be cooled 131 is recovered by the circulating water cooling unit (not shown) of the cooling tower 120 through the circulating water recovery line L112.

  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.

  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.

The first electrical conductivity sensor 133 is a device that measures the water quality of the circulating water W2 flowing through the circulating water line L110 and outputs it as a first detected electrical conductivity value (detected water quality value). The first electrical conductivity sensor 133 is connected to the circulating water supply line L111 at the connection portion J1. The connecting portion J1 is disposed between the circulating water pump 132 and the cooled device 131. The first electrical conductivity sensor 133 is electrically connected to the system control device 100. The first detected electrical conductivity value measured by the first electrical conductivity sensor 133 (hereinafter also referred to as “first electrical conductivity EC ₁ ”) is transmitted to the system control device 100. The first electrical conductivity sensor 133 measures the electrical conductivity of the circulating water W2 at a predetermined time interval (or real time), and transmits the first electrical conductivity EC ₁ to the system control device 100.

  The chemical supply device 134 is a device capable of performing a chemical injection process for supplying a scale inhibitor, an anticorrosive agent, and a bactericidal agent as chemicals to the circulating water W2. The medicine supply device 134 is connected to the circulating water supply line L111 at the connection portion J2. The connection portion J2 is disposed between the connection portion J1 and the cooled device 131.

  The scale inhibitor is a chemical used to prevent scale growth in water or scale deposition on a pipe surface or the like. The anticorrosive is a chemical used mainly for suppressing the occurrence of overall corrosion in the piping system or the like, or partial corrosion such as pitting. A disinfectant is a chemical used to suppress the growth of microorganisms in water, and is also called a slime control agent. In the present embodiment, the scale inhibitor, the anticorrosive agent, and the bactericidal agent are collectively referred to as “medicine”.

  The scale inhibitor, anticorrosive, and bactericidal agent are supplied to the circulating water supply line L111 from the respective chemical tank and chemical supply pump (not shown). The drug supply pump is a facility for simultaneously sending drugs stored in each drug tank to the circulating water supply line L111.

  The medicine supply pump of this embodiment is an electromagnetically driven diaphragm type metering pump. When an electromagnetically driven diaphragm type metering pump is used as the medicine supply pump, the medicine is intermittently supplied to the circulating water W2 by the reciprocating motion of the valve body of the diaphragm.

  The medicine supply pump can control the medicine discharge flow rate [mL / min] by setting the discharge amount [mL / stroke] per stroke to a predetermined value and increasing / decreasing the number of strokes [stroke / min]. The number of strokes refers to the number of times the valve body reciprocates per unit time, and one reciprocation of the valve body corresponds to one stroke. The medicine supply pump is electrically connected to the system controller 100. When a pump drive signal (pulse signal) is output from the system control device 100, the drug supply pump has a specified number of strokes over a period of the pulse width (hereinafter also referred to as “operation time”). Execute the input.

  In addition, although this embodiment demonstrates the example which supplies the composite chemical | medical agent which mix | blended the scale inhibitor, the anticorrosive, and the bactericidal agent from one chemical | medical agent supply apparatus 134, a scale inhibitor, an anticorrosive, and a disinfectant are used. You may supply with a respectively separate chemical | medical agent supply apparatus.

  In addition, a makeup water line L120 is connected to the cooling tower 120. The makeup water line L120 is a line for replenishing the makeup water W1 to the storage section 122 of the cooling tower 120. The upstream side of the makeup water line L120 is a first makeup water line L121 connected to a supply source (not shown) of makeup water W1 such as tap water and industrial water. On the other hand, the downstream side of the makeup water line L120 branches to the second makeup water line L122 and the third makeup water line L123 at the branch portion J3. The branch portion J3 is disposed between the connection portion J4 (described later) and the cooling tower 120.

  A flow sensor 135 is connected to the first makeup water line L121. The flow sensor 135 is a device that detects the flow rate per unit time of the makeup water W1 that flows through the first makeup water line L121. The flow sensor 135 is connected to the first makeup water line L121 at the connection portion J4. The connection portion J4 is disposed between the connection portion J5 (described later) and the branch portion J3.

  As the flow rate sensor 135, 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. The Hall IC is an electronic circuit in which a voltage regulator, a Hall element, an amplifier circuit, a Schmitt trigger circuit, an output transistor, etc. are packaged, and the impeller rotates once in response to a change in magnetic flux accompanying the rotational movement of the impeller. A rectangular wave pulse signal is output as the detected water amount value every time. The flow rate [L / pulse] when the impeller rotates once is determined by the design specification of the flow rate sensor. Therefore, a chemical injection control unit 202 (described later) of the system control apparatus 100 can calculate the makeup water amount [L] of the makeup water W1 based on the pulse signal output from the flow sensor 135.

  For example, in the flow rate sensor 135, when the flow rate when the impeller rotates once is 1 [L], if the number of pulse signals output from the flow rate sensor 135 is 3 pulses, the makeup water amount of the makeup water W1 Becomes 3 [L].

  The flow sensor 135 is electrically connected to the system control device 100. The pulse signal output from the flow sensor 135 is transmitted to the system controller 100.

A second electrical conductivity sensor 139 is connected to the first makeup water line L121. The second electrical conductivity sensor 139 is a device that measures the water quality of the makeup water W1 flowing through the first makeup water line L121 and outputs it as a second detected electrical conductivity value (detected water quality value). The second electrical conductivity sensor 139 is connected to the first makeup water line L121 at the connection portion J5. The connecting portion J5 is disposed between the supply source (not shown) of the makeup water W1 and the connecting portion J4. The second electrical conductivity sensor 139 is electrically connected to the system control device 100. A second detected electrical conductivity value (hereinafter also referred to as “second electrical conductivity EC ₂ ”) measured by the second electrical conductivity sensor 139 is transmitted to the system control device 100. Second electrical conductivity sensor 139 measures the electric conductivity of supplementary water W1 at a predetermined time interval (or real-time), sends the system control device 100 to the second electrical conductivity EC _2.

  The downstream end of the second makeup water line L122 is connected to the tower main body 121 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 system control device 100. The open / closed state (open / closed state) of the valve body in the makeup water valve 136 is controlled by a valve drive signal output from the system control device 100 (blow processing control unit 201).

  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 W2 stored in the storage unit 122. When the water level of the storage part 122 decreases due to evaporation loss and scattering loss of the circulating water W2, the ball tap of the water tap 137 is activated, and the supply water W1 flowing through the third supply water line L123 is supplied to the storage part 122.

  The drain line L130 is erected inside the storage portion 122 and extends downward. The upstream end of the drain line L130 forms an inlet 138 for the circulating water W2. The inflow port 138 is opened above the control water level of the water tap 137. On the other hand, the downstream end of the drain line L130 communicates with the outside of the reservoir 122. In the drainage line L130, when the replenishing water valve 136 is opened and the replenishing water W1 is forcibly supplied in the blow processing described later, the water treatment system 1 uses the circulating water W2 overflowing from the storage unit 122 of the cooling tower 120. It is a line that discharges outside the system.

  In the present embodiment, the make-up water valve 136 and the inlet 138 constitute a blow unit capable of executing a blow process for discharging a part of the circulating water W2 from the cooling tower 120 while supplying the make-up water W1 to the cooling tower 120. To do.

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

  The system control device 100 controls the operation of each unit in the water treatment system 1 of the present embodiment. As shown in FIG. 2, the system control device 100 is electrically connected to, for example, a circulating water pump 132, a medicine supply device 134, and a makeup water valve 136.

  The system control device 100 is electrically connected to the measurement devices of the water treatment system 1 and receives measurement information from these measurement devices. For example, the system control device 100 is electrically connected to a first electrical conductivity sensor 133, a second electrical conductivity sensor 139, and a flow rate sensor 135 as measurement devices. In the system control apparatus 100, the latest measurement information received from each measurement apparatus is stored in the memory 300 as appropriate.

  The system control device 100 includes a control unit 200 and a memory 300. The control unit 200 includes a blow processing control unit 201, a medicine injection control unit 202 as a medicine supply control unit, and a time measuring unit 203. The functions of the blow processing control unit 201, the medicine injection control unit 202, and the time measuring unit 203 in the control unit 200 are realized by a microprocessor (not shown) including a CPU and an internal memory.

Blow processing control unit 201, when the first electrical conductivity EC ₁ circulating water W2 detected by the first conductivity sensor 133, reaches the upper limit threshold value EC _b1 or as preset allowable quality value Then, the makeup water valve 136 is controlled to perform the blow process. The upper threshold EC _b1 is determined in consideration of, for example, a concentration factor that can ensure the durability of the effects of the scale inhibitor and the anticorrosive.

The blow process control unit 201 performs drainage of the circulating water W2 and supply of the makeup water W1 simultaneously (or continuously) as the blow process. Specifically, the blow processing control unit 201 opens the makeup water valve 136 when the first electrical conductivity EC ₁ ≧ the upper limit threshold EC _b1 , that is, when the quality of the circulating water W2 deteriorates, The fresh makeup water W1 is forcibly replenished to the storage section 122 through the second makeup water line L122. When the replenishment water W1 is replenished, the water level of the storage unit 122 rises, so that the circulating water W2 overflowing from the inflow port 138 is discharged to the outside through the drainage line L130. That is, when the blowing process is performed, a part of the advanced a concentrated circulation water W2 because replace a makeup water W1, the first electrical conductivity EC ₁ of the circulating water W2 in the circulation water line L110 is entirely decreased .

The blow processing control unit 201 replenishes when the first electrical conductivity EC ₁ ≦ the lower limit threshold EC _b2 is satisfied after the makeup water valve 136 is opened, that is, when the water quality of the circulating water W2 is recovered. The water valve 136 is closed and the replenishment of the makeup water W1 is stopped. Naturally, the relationship between the upper limit threshold EC _b1 that is the start point of the blow process and the lower limit threshold EC _b2 that is the end point of the blow process is the upper limit threshold EC _b1 > the lower limit threshold EC _b2 .

  The blow process control unit 201 outputs an external stop signal (interlock signal) to the medicine injection control unit 202 when starting the blow process. The external stop signal is a signal for notifying execution of the blow process. Moreover, the blow process control part 201 stops the output of the external stop signal to the chemical injection control part 202, when a blow process is complete | finished.

  Based on the pulse signal output from the flow sensor 135, the chemical injection control unit 202 calculates the makeup water amount of the makeup water W1, and the amount of medicine proportional to the calculated makeup water amount of the makeup water W1 is the circulating water W2. In the medicine supply device 134, the chemical injection process by the flow rate chemical injection process is executed.

  Specifically, the medicine injection control unit 202 counts the number of pulse signals output from the flow sensor 135 and is proportional to the number of pulse signals (the amount of makeup water) every time the number reaches a predetermined number of pulse signals. The medicine supply process is executed in the medicine supply device 134 so that the supplied amount of medicine is supplied to the circulating water W2 (frequency division control).

  In the medicine injection control unit 202, every time one pulse signal is output from the flow sensor 135, the medicine supply device 134 performs the medicine injection processing a plurality of times so that a predetermined amount of medicine is supplied to the circulating water W2. It may be repeatedly executed (counter control).

  The medicine injection control unit 202 outputs a pump drive signal having a pulse width corresponding to the calculated amount of medicine to be supplied to the medicine supply device 134. Thereby, in the medicine supply pump (not shown) of the medicine supply device 134, the medicine is supplied at the designated stroke number over the period (operation time) of the pulse width of the pump drive signal output from the medicine injection control unit 202. The charging is executed, and a required amount of chemicals is supplied to the circulating water W2.

  If the blow process is being executed, the chemical injection control unit 202 waits for the chemical supply process to be performed in the medicine supply device 134 until the blow process is completed, and is detected during the blow process execution period after the blow process is executed. The chemical supply process is executed in the chemical supply device 134 so that an input amount of chemical proportional to the supplied amount of makeup water is supplied to the circulating water W2.

  The medicinal injection control unit 202 determines that the blow process has been started (executed) when an external stop signal is output from the blow process control unit 201. In addition, the medicine injection control unit 202 determines that the blow process has ended when the output of the external stop signal from the blow process control unit 201 is stopped.

  In addition, when the next blow process is executed during the execution of the waiting drug injection process, the drug injection control unit 202 interrupts the execution of the drug injection process by the drug supply device 134. Here, the medicine injection control unit 202 stores in the memory 300 the amount of medicine that has not been supplied to the circulating water W2 in the interrupted medicine injection process. Moreover, the medicine injection control unit 202 counts the number of pulse signals output from the flow sensor 135 as the number of pulse signals P during the execution period of the next blow process. Thereby, the chemical injection control part 202 can calculate the amount of replenishment water during the execution period of the blow process after execution of the next blow process.

  Then, after the next blow process is executed, the medicine injection control unit 202 stores the amount of medicine input stored in the memory 300 and the number of pulse signals P (replenishment water amount) detected during the execution period of the next blow process. The pump drive signal having a pulse width corresponding to the total amount of the drug so that the total amount of the drug (hereinafter also referred to as “total amount”) proportional to the total amount of the drug is supplied to the circulating water W2. Is output to the medicine supply device 134.

The medicinal injection control unit 202 calculates an input amount [mL] of the medicine proportional to the replenishment water amount [L] based on the following equation (1).
Drug input amount = Supply water amount of supply water W1 × Required amount of drug (1)

Here, the required amount of drug [mL / L] (the amount of drug per unit replenishment water amount) is calculated based on the following equation (2).
Required amount of drug = drug maintenance concentration / concentration ratio of circulating water W2 / specific gravity of drug (2)

Moreover, the chemical injection control part 202 calculates the concentration magnification of the circulating water W2 in Formula (2) based on the following formula (3).
Concentration magnification = first detected electric conductivity value / second detected electric conductivity value (3)

The first detection electric conductivity value is a first electrical conductivity EC ₁ of the circulating water W2 outputted from the first electrical conductivity sensor 133. The second detection electric conductivity value, a second electrical conductivity EC ₂ makeup water W1 outputted from the second electrical conductivity sensor 139.

  Agents such as scale inhibitors and anticorrosive agents need to maintain an appropriate concentration in the circulating water W2. When the variation of the drug concentration is large, a sufficient effect cannot be obtained. Accordingly, in the chemical injection management of the circulating water W2, it is necessary to keep the drug concentration higher than the drug maintenance concentration at which the drug exhibits an effect. The required amount of the drug in the conventional drug administration is determined based on the state where the drug is not most concentrated in the circulating water W2, that is, the state where the concentration rate of the circulating water W2 is the lowest, and is operated as a fixed value. . However, since the electrical conductivity of the circulating water W2 and the makeup water W1 both vary with time, the concentration rate of the circulating water W2 is not a constant value. Therefore, in the conventional chemical injection management, when the concentration rate of the circulating water W2 increases, the drug concentration exceeds the drug maintenance concentration, and the excess drug may be wasted. . Therefore, the medicine injection control unit 202 of the present embodiment adjusts the required amount of medicine following the change in the concentration rate of the circulating water W2.

First, the electrical conductivity of the circulation water W2 (first electric conductivity EC ₁₎ is a case in which fluctuations, explaining its effect. The water treatment system 1 of the present embodiment, during the operation of the cooling tower 120, a first electrical conductivity EC ₁ of the circulating water W2 is the transition between the upper threshold _{EC b1} lower limit threshold _{EC b2} blow process control unit 201 To be managed. For example, the drug maintenance concentration is 200 mg / L, the upper threshold EC _b1 is set to 120 mS / m, the lower threshold EC _b2 is set to 100 mS / m, the drug specific gravity is 1.15 mg / mL, and the electric conductivity of the makeup water W1 is 20 mS / m. Consider the case of m. When the concentration of the circulating water W2 progresses and the first electric conductivity EC ₁ = the upper limit threshold EC _b1 is reached, the concentration rate of the circulating water W2 is 6, and the required amount of the drug is 29 mL / L. On the other hand, when the blow process is executed and the first electric conductivity EC ₁ = the lower limit threshold EC _b2 , the concentration rate of the circulating water W2 is 5, and the required amount of the drug is 35 mL / L. That is, in the medicinal injection control unit 202, the required amount of the drug is adjusted in the range of 35 to 29 mL / L following the change of the concentration rate of the circulating water W2 in the range of 5 to 6, so the drug maintenance concentration Is kept at 200 mg / L, and wasteful use of the drug can be suppressed.

Next, when the second electrical conductivity EC ₂ makeup water W1 is varied, it will be described the effects. Second electrical conductivity EC ₂ makeup water W1 is, if using a industrial water and groundwater in the makeup water W1, changes due to seasonal factors (e.g., rainfall). The second electrical conductivity EC ₂ makeup water W1, such as the industrial water and groundwater, reuse water (e.g., pure water used for washing) When a blend of being a makeup water W1, the reuse water It varies depending on the recovery rate. For example, the drug maintenance concentration is set to 200 mg / L, the drug specific gravity is 1.15 mg / mL, the electric conductivity of the circulating water W2 is 110 mS / m, and the fluctuation range of the electric conductivity of the makeup water W1 is 15 to 25 mS / m. Consider the case. When the quality of the makeup water W1 is good and the second electrical conductivity EC _{2 is} 15 mS / m, the concentration rate of the circulating water W2 is 7.3, and the required amount of the drug is 24 mL / L. On the other hand, when the water quality of the makeup water W1 deteriorates and the second electrical conductivity EC ₂ = 25 mS / m, the concentration rate of the circulating water W2 is 4.4, and the required amount of the drug is 40 mL / L. Become. That is, if the concentration of the circulating water W2 changes in the range of 4.4 to 7.3 and the required amount of the drug is adjusted in the range of 40 to 24 mL / L, the drug maintenance concentration Is kept at 200 mg / L, and wasteful use of the drug can be suppressed.

In addition, in the medicinal injection control unit 202, the calculation of the concentration rate according to the expression (3) is such that the first detected electrical conductivity value (first electrical conductivity EC ₁ ) of the circulating water W2 is equal to or greater than a predetermined value (for example, , Lower threshold EC _b2 or more). For example, the operation starts or immediately after installing the water treatment system 1, in such case of replacing the circulating water W2 total of first conductivity EC ₁ and the second electrical conductivity EC ₂ is substantially equal. At that time, if an attempt is made to maintain the drug maintenance concentration based on the concentration ratio calculated by the equation (3), the necessary amount of the drug calculated by the equation (2) becomes excessively large. Therefore, when the first electrical conductivity EC ₁ is less than the preset specified value, the medicine injection control unit 202 has a predetermined basic input set based on the basic input concentration of the medicine and the retained water amount of the circulating water system. Dosage in bulk.

In addition, when the cooling tower 120 is in operation and the period during which the makeup water W1 is not supplied to the cooling tower 120 (residence time T _T described later) exceeds a preset allowable period, the chemical injection control unit 202 is operating. Causes the medicine supply device 134 to execute a medicine injection process (hereinafter also referred to as “auxiliary medicine injection processing”). In the auxiliary medicine injection process, a preset amount of medicine is supplied to the circulating water W2. In the present embodiment, a bactericidal agent is supplied to the circulating water W2 in the auxiliary drug injection process. In addition, in a supplementary chemical injection process, you may supply a scale preventive agent, an anticorrosive, and a disinfectant similarly to a normal chemical injection process.

  The chemical injection control unit 202 determines the operating state of the cooling tower 120 based on the pump operation signal output from the system control device 100 to the circulating water pump 132. That is, the chemical injection control unit 202 determines that the cooling tower 120 is in operation when a pump operation signal is output from the system control device 100 to the circulating water pump 132. In addition, when the pump operation signal is not output from the system control apparatus 100 to the circulating water pump 132, the chemical injection control unit 202 determines that the cooling tower 120 is stopped.

A period during which the makeup water W1 is not supplied to the cooling tower 120 (hereinafter, also referred to as “residence time T _T ”) is counted by a timing unit 203 (described later). Dosing control unit 202, the time elapsed from the reception of the pulse signal from the flow rate sensor 135, thereby counting the residence time T _T to the clock unit 203. The dosing control unit 202, when counting residence time T _T of the timer unit 203 exceeds a preset allowable residence time T _W, so that the drug prescribed charging amount is supplied to the circulating water W2 In addition, the medicine supply process is executed in the medicine supply device 134.

Dosing control unit 202, after receiving a pulse signal from the flow rate sensor 135, and starts counting the residence time T _T to start the clock section 203. In addition, the medicine injection control unit 202 receives the next pulse signal from the flow sensor 135 before the residence time T _T measured by the timing unit 203 exceeds the preset allowable residence time T _W. It resets the time count of the residence time _{T T} of the clocking unit 203.

  The medicine injection control unit 202 ends the execution of the auxiliary medicine injection processing by the medicine supply device 134 when the blow processing is executed while the auxiliary medicine injection processing is being executed. In addition, when the supplementary chemical injection process is terminated, the amount of the medicine that is proportional to the amount of replenishment water during the blow process execution period is expressed by equations (1) to (3) as in the chemical injection process described above. Calculated based on

The time measuring unit 203 measures a period during which the makeup water W1 is not supplied to the cooling tower 120 (residence time T _T ).

The memory 300 is a storage device that stores various data related to the blow process and the chemical injection process. For example, in the memory 300, the first electrical conductivity EC ₁ (updated value) measured by the first electrical conductivity sensor 133 and the second electrical conductivity EC ₂ (updated) measured by the second electrical conductivity sensor 139 are stored. Value), upper limit threshold EC _b1 (set value) that is the start point of the blow process, lower limit threshold EC _b2 (set value) that is the end point of the blow process, the number P of pulse signals counted by the drug injection control unit 202, and interruption The amount of medicine that has not been supplied to the circulating water W2 in the chemical injection process or the auxiliary chemical injection process, the residence time _{TT, and the} like are stored.

  Next, in the water treatment system 1, the timing for executing the above-described chemical injection process and auxiliary chemical injection process will be described.

  First, the operation of the chemical injection control unit 202 when the chemical injection process is executed by flow proportional chemical injection will be described with reference to FIG. FIG. 3 (A) is a time chart in the case of performing a chemical injection process by flow rate proportional chemical injection. FIG. 3B is a time chart when the chemical injection process is made to wait by the blow process. FIG. 3C is a time chart in the case where the next blow process is executed while the waiting chemical injection process is being executed.

  In FIG. 3 and FIG. 4 (described later), “flow rate pulse” indicates a pulse signal output from the flow rate sensor 135. The “medicine injection operation” indicates the operation time of the medicine supply device 134 (the medicine supply pump). “Blow operation” indicates the opening time of the makeup water valve 136 during the blowing process. Moreover, the waveforms shown in FIGS. 3 and 4 show the respective time intervals with a conceptual length, and do not correspond to the actual time intervals. In addition, in the medicine injection operation, the amount of medicine to be supplied to the circulating water W2 is indicated by a pulse width proportional to the amount of introduction.

  As shown in FIG. 3A, every time the pulse signal (flow rate pulse) output from the flow rate sensor 135 reaches a predetermined number of pulse signals (for example, 3 pulses), the drug injection control unit 202 In 134, a chemical injection process (chemical injection operation) is executed.

Next, as shown in FIG. 3B, when the blow process A is executed, the medicine injection control unit 202 stops outputting the pump drive signal to the medicine supply device 134 until the blow process A is completed. Then, the execution of the chemical injection process is made to wait. The medicine injection control unit 202 counts the number of pulse signals output from the flow sensor 135 during the execution period of the blow process A as the number of pulse signals P. The dosing control unit 202, after execution of the blowing process A, as input amount to Q ₁ drug in proportion to the counted number of pulse signals P (supply water amount q ₁₎ is supplied to the circulating water W2, the drug A drive signal having a pulse width corresponding to the input amount Q ₁ is output to the medicine supply device 134. Thereby, in the medicine supply device 134, the medicine injection process a is executed.

As shown in FIG. 3 (B), when a pulse signal is output from the flow rate sensor 135 during the execution of the chemical injection process a, the input amount of the drug is proportional to the number of pulse signals (replenishment water amount q ₃ ). as Q ₃ is supplied to the circulating water W2, and outputs a drive signal having a pulse width corresponding to the input amount Q ₃ of the drug to the drug feeder 134. For this reason, in the medicine injection process a, a drive signal having a pulse width corresponding to the medicine input amount Q ₁ + Q ₃ is output to the medicine supply device 134.

Next, as shown in FIG. 3 (C), when the next blow process B is executed while the medicine injection process a waited in FIG. 3 (B) is being executed, the medicine injection control unit 202 is executed. Stops the output of the drive signal to the medicine supply device 134 until the blow process B ends, and interrupts the execution of the medicine injection process a. The chemical injection control unit 202 counts the number of pulse signals output from the flow sensor 135 during the execution period of the blow process B as the number of pulse signals P. Also, dosing control unit 202 stores the input amount Q _X of drug that is not supplied to the circulating water W2 in the dosing process a which is interrupted in the memory 300.

The dosing control unit 202, after execution of the blowing process B, had been stored in the memory 300, and a charged amount Q _X of drug that is not supplied to the circulating water W2 in the dosing process a, blow process B The amount of medicine (and the amount of medicine input Q ₃ ) summed with the amount of medicine input Q ₂ (calculated value) proportional to the number of pulse signals P (make-up water amount q ₂ ) detected during the execution period is circulating water. A driving signal having a pulse width corresponding to the amount of drug input Q _X + Q ₂ + Q ₃ is output so as to be supplied to W2. Thereby, in the medicine supply device 134, the medicine injection process a ′ is executed (resumed).

  Next, the operation of the drug injection control unit 202 when executing the auxiliary drug injection process will be described with reference to FIG. FIG. 4 is a time chart showing the timing of executing the auxiliary drug injection process in the water treatment system 1. In FIG. 4, the pulse signal (flow rate pulse) output from the flow rate sensor 135 is omitted.

As shown in FIG. 4, during the operation period of the cooling tower 120, a period in which the makeup water W <b> 1 is not supplied to the cooling tower 120 after the execution of the blow process A, that is, a period in which no pulse signal is output from the flow rate sensor 135. _{If T)} exceeds a preset allowable residence time T _W, dosing control unit 202 to execute an auxiliary chemical feed process b in the drug supply device 134. The auxiliary chemical feed process, preset drug dosages Q ₃ is supplied to the circulating water W2.

Further, during execution of auxiliary chemical feed process b, if the blowing process B is executed, dosing control unit 202, without waiting for the completion of the drug supply input amount Q _3, the drive signal to the drug feeder 134 Is stopped and the execution of the auxiliary medicine injection process b is terminated. The chemical injection control unit 202 counts the number of pulse signals output from the flow sensor 135 during the execution period of the blow process B as the number of pulse signals P. The dosing control unit 202, after execution of the blowing process B, a blow process B of detected during execution the number of pulse signals P (supply water amount q ₄₎ of the drug in proportion to the input amount Q ₄ is circulating water W2 as supplied, and outputs a drive signal having a pulse width corresponding to the input amount Q ₄ of the drug. Thereby, the chemical injection process b 'by the normal flow rate proportional chemical injection control is executed.

Here, dosing control unit 202, for charged amount Q _X of not supplied to the circulating water W2 in was terminated adjuvants Note process b agents, it does not execute the dosing process. The supplementary chemical injection process is executed as a supplement to the decrease or loss of the medicinal effect associated with the long-term retention of the circulating water W2. If the blow process B is performed, a new chemical | medical agent will be supplied by the subsequent chemical injection process b ', and the chemical | medical agent in circulating water W2 will be replaced. Therefore, after the execution of the blowing process B, since the dosing process exceeding input amount Q ₄ required in dosing process b'is wasted, so that not executed.

  Next, in the water treatment system 1 of this embodiment, the operation | movement of the blow process performed by the control part 200 and the chemical injection process is demonstrated with reference to the flowchart of FIGS.

  First, the blow process control will be described. FIG. 5 is a flowchart showing a processing procedure when the control of the blow process is executed by the control unit 200. The control of the flowchart shown in FIG. 5 is executed by the blow process control unit 201 of the control unit 200 based on a control program stored in the memory 300. Further, the process of the flowchart shown in FIG. 5 is repeatedly executed during operation of the water treatment system 1.

In step ST101 shown in FIG. 5, the blow processing control unit 201 sets the first electrical conductivity EC ₁ of the circulating water W2 measured by the first electrical conductivity sensor 133 and the upper limit threshold EC _b1 that is the starting point of the blow processing. Is obtained from the memory 300.

In step ST 102, the blow processing control unit 201 determines the first electrical conductivity EC ₁ is whether the upper threshold _{EC b1} more. In step ST102, when the blow process control unit 201 determines that the first electrical conductivity EC ₁ ≧ the upper limit threshold EC _b1 (YES), the concentration rate of the circulating water W2 reaches a predetermined concentration rate. Therefore, the process proceeds to step ST103. In Step ST102, when the blow process control unit 201 determines that the first electrical conductivity EC ₁ <the upper limit threshold EC _b1 (NO), the concentration rate of the circulating water W2 is set to a predetermined concentration rate. Since it has not reached, the process returns to step ST101.

  In step ST103 (step ST102: YES), the blow process control unit 201 opens the makeup water valve 136 and starts the blow process.

By performing the blow process in step ST103, the makeup water W1 is forcibly replenished to the storage section 122 of the cooling tower 120, while a part of the circulating water W2 staying in the storage section 122 is discharged from the drain line L130 to the outside. to be discharged, first electrical conductivity EC ₁ of the circulating water W2 gradually decreases.

In step ST104, the blow processing control unit 201 obtains the first electrical conductivity EC ₁ of the circulating water W2 measured by the first electrical conductivity sensor 133 and the lower limit threshold EC _b2 that is the end point of the blow processing from the memory 300. get.

In step ST105, the blow process control unit 201, a first electrical conductivity EC ₁ determines whether the lower limit threshold _{EC b2} below. In this step ST105, when the blow process control unit 201 determines that the first electric conductivity EC ₁ ≦ the lower limit threshold EC _b2 (YES), it is considered that the concentration of the circulating water W2 has sufficiently decreased. Therefore, the process proceeds to step ST106. In step ST105, if the blow process control unit 201 determines that the first electrical conductivity EC ₁ > the lower limit threshold EC _b2 (NO), the concentration of the circulating water W2 is not decreased. Since it is considered, the process returns to step ST104.

  In step ST106 (step ST105: YES), the blow process control unit 201 closes the makeup water valve 136 and ends the blow process. Thereby, the process of this flowchart is complete | finished (it returns to step ST101).

  Next, the control of the chemical injection process by the flow proportional chemical injection will be described. FIG. 6 is a flowchart illustrating a processing procedure when the control of the chemical injection process is executed in the control unit 200. The control of the flowchart shown in FIG. 6 is executed by the medicine injection control unit 202 of the control unit 200 based on the control program stored in the memory 300. Moreover, the process of the flowchart shown in FIG. 6 is repeatedly performed during the operation of the water treatment system 1.

  In step ST201 shown in FIG. 6, the medicine injection control unit 202 determines whether or not a predetermined number of pulse signals have been received from the flow sensor 135 (whether or not the counted pulse signals have reached a predetermined number). In this step ST201, when it determines with the chemical injection control part 202 having received the predetermined number of pulse signals (YES), a process transfers to step ST202. Moreover, in step ST201, when it determines with the chemical injection control part 202 not receiving the predetermined number of pulse signals (NO), a process returns to step ST201.

  If the blow process is executed while the pulse signal output from the flow sensor 135 has not reached the predetermined number, the medicine injection control unit 202 stores the count number up to that time in the memory 300. Then, in the drug injection process after the blow process, the amount of the medicine that is proportional to the number of pulse signals (the amount of replenishment water) is added to the amount of the injection calculated in step ST207 (described later) (in the flowchart shown in FIG. 6). Omitted).

  In step ST202 (step ST201: YES), the medicine injection control unit 202 determines whether or not the blow process has been started (executed). The medicinal injection control unit 202 can determine whether or not the blow process has been started based on the presence or absence of an external stop signal output from the blow process control unit 201.

  In this step ST202, when it determines with the chemical injection control part 202 having started the blow process (YES), a process transfers to step ST204. In this case, execution of the medicine injection process is in a standby state. In step ST202, when the chemical injection control unit 202 determines that the blow process has not been started (NO), the process proceeds to step ST203.

  In step ST203 (step ST202: NO), the medicinal injection control unit 202 calculates the dose of the drug based on the pulse signal acquired in step ST201, and supplies a driving signal having a pulse width corresponding to the dose. Output to the device 134. Thereby, in the medicine supply device 134, a medicine injection process is executed. When the medicine injection process in step ST203 ends, the process of this flowchart ends (returns to step ST201).

  In addition, when a blow process is started while performing the chemical injection process in step ST203, it transfers to the process of step ST204 mentioned later. In that case, the medicine injection process performed in step ST203 is cancelled.

  On the other hand, in step ST204 (step ST202: YES), the medicine injection control unit 202 counts the number of pulse signals output from the flow sensor 135 as the number of pulse signals P (starts counting of P).

  In step ST205, the medicine injection control unit 202 determines whether or not the blow process has ended. In this step ST205, when the medicinal injection control unit 202 determines that the blow process has been completed (YES), the process proceeds to step ST206. In step ST205, when the chemical injection control unit 202 determines that the blow process has not ended (NO), the process returns to step ST205.

  In step ST <b> 206 (step ST <b> 205: YES), the medicine injection control unit 202 resets the count of the number of pulse signals P and stores the counted number of pulse signals P in the memory 300.

  In step ST207, the medicine injection control unit 202 reads the counted number of pulse signals P from the memory 300, calculates the amount of the drug to be injected in proportion to the number of pulse signals P, and has a pulse width corresponding to the amount of input. A drive signal is output to the medicine supply device 134. Thereby, in the medicine supply device 134, a medicine injection process is executed.

  In step ST208, the chemical injection control unit 202 determines whether or not the chemical injection processing is completed. In this step ST208, when the chemical injection control unit 202 determines that the chemical injection process has been completed (YES), the processing of this flowchart ends (returns to step ST201). Moreover, in step ST208, when it determines with the chemical injection process not being complete | finished (NO), a process transfers to step ST209.

  In step ST209 (step ST208: NO), the medicine injection control unit 202 determines whether or not the blow process has been started (executed). The medicinal injection control unit 202 can determine whether or not the blow process has been started based on the presence or absence of an external stop signal output from the blow process control unit 201.

  In this step ST209, when it determines with the chemical injection control part 202 having started the blow process (YES), a process transfers to step ST210. In step ST209, when the chemical injection control unit 202 determines that the blow process has not been started (NO), the process returns to step ST208.

  In step ST210 (step ST209: YES), the medicine injection control unit 202 stops outputting the driving signal to the medicine supply device 134 and interrupts the medicine injection processing. Further, the medicine injection control unit 202 stores in the memory 300 the amount of medicine that has not been supplied to the circulating water W2 in the interrupted medicine injection process.

  In step ST211, the medicine injection control unit 202 counts the number of pulse signals output from the flow sensor 135 as the number of pulse signals P (starts counting of P).

  In step ST212, the chemical injection control unit 202 determines whether or not the blow process has been completed. In this step ST212, when the chemical injection control unit 202 determines that the blow process has ended (YES), the process proceeds to step ST213. In step ST212, when the chemical injection control unit 202 determines that the blow process has not been completed (NO), the process returns to step ST212.

  In step ST213 (step ST212: YES), the medicine injection control unit 202 resets the count of the number of pulse signals P and stores the counted number of pulse signals P in the memory 300.

  In step ST214, the medicinal injection control unit 202 reads from the memory 300 the amount of the medicine that has not been supplied to the circulating water W2 in the interrupted medicinal injection process. In addition, the medicine injection control unit 202 reads the counted number of pulse signals P from the memory 300 and calculates the amount of medicine input proportional to the number of pulse signals P. Then, the medicine injection control unit 202 supplies the amount of medicine proportional to the amount of medicine that was not supplied to the circulating water W2 in the suspended medicine injection processing and the number of pulse signals P detected during the execution period of the blowing process. A drive signal having a pulse width corresponding to the total amount of the drug is output to the drug supply device 134 so that the total amount of the drug added to the input amount is supplied to the circulating water W2. Thereby, the medicine injection process is executed (resumed) in the medicine supply device 134. When the medicine injection process in step ST214 is completed, the process of this flowchart ends (returns to step ST201).

  Next, the control of the auxiliary medicine injection process will be described. 7 and 8 are flowcharts showing a processing procedure in the case where the control unit 200 executes control of the auxiliary drug injection process. The control of the flowcharts shown in FIGS. 7 and 8 is executed by the medicine injection control unit 202 of the control unit 200 based on the control program stored in the memory 300. Moreover, the process of the flowchart shown in FIG.7 and FIG.8 is repeatedly performed during the driving | operation of the water treatment system 1 (cooling tower 120).

  In step ST301 shown in FIG. 7, the chemical injection control unit 202 determines whether there is an output of a pump operation signal to the circulating water pump 132 (whether the cooling tower 120 is in operation). In step ST301, when the chemical injection control unit 202 determines that there is an output of a pump operation signal to the circulating water pump 132 (YES), the process proceeds to step ST302. In Step ST301, when the chemical injection control unit 202 determines that there is no pump operation signal output to the circulating water pump 132 (NO), the process returns to Step ST301.

  In step ST302, the medicine injection control unit 202 determines whether or not there is no pulse signal output from the flow sensor 135. In this step ST302, when the chemical injection control unit 202 determines that there is no pulse signal output from the flow sensor 135 (YES), the process proceeds to step ST303. Moreover, in step ST302, when it determines with the chemical injection control part 202 having the output of the pulse signal from the flow sensor 135 (NO), a process returns to step ST302.

Step ST 303: (Step ST 302 YES), dosing control unit 202 activates the timing unit 203, and starts counting the residence time _{T T.} The residence time T _T is the period of the pulse signal from the flow rate sensor 135 is not outputted.

In step ST 303, dosing control unit 202, the residence time _{T T,} which is kept by time keeping unit 203 determines whether or not exceeded the allowable residence time _{T W.} Incidentally, dosing control unit 202 obtains the allowable residence time _{T W} from the memory 300. In this step ST 304, the dosing control unit 202, when it is determined that the residence time _{T T>} acceptable residence time _{T W} (YES), the process proceeds to step ST 307. Further, in step ST 304, the dosing control unit 202, when it is determined that the residence time _{T T} ≦ allowable residence time _{T W} (NO), the process proceeds to step ST 305.

  In step ST305 (step ST304: NO), the medicine injection control unit 202 determines whether there is a pulse signal output from the flow sensor 135 or not. In this step ST305, when it determines with the chemical injection control part 202 having the output of the pulse signal from the flow sensor 135 (YES), a process transfers to step ST306. In step ST305, when the chemical injection control unit 202 determines that there is no pulse signal output from the flow sensor 135 (NO), the process returns to step ST304.

Step ST 306: (Step ST 305 YES), dosing control unit 202 resets the counting of the retention time _{T T} by clock section 203. Thereby, the process of this flowchart is complete | finished (it returns to step ST301). In the case the residence time T _T there is an output of the pulse signals from the flow sensor 135 before reaching the allowable residence time T _W (i.e., when there is a supply of makeup water W1), does not execute an auxiliary chemical feed processing Because.

  On the other hand, in step ST307 (step ST304: YES), the medicine injection control unit 202 causes the medicine supply device 134 to execute auxiliary medicine injection processing so that a preset amount of medicine is supplied to the circulating water W2.

  Next, in step ST308 shown in FIG. 8, the medicine injection control unit 202 determines whether or not the blow process has been started (executed). In this step ST308, when it determines with the chemical injection control part 202 having started the blow process (YES), a process transfers to step ST309. In step ST308, when the chemical injection control unit 202 determines that the blow process has not been started (NO), the process proceeds to step ST314.

  In step ST309 (step ST308: YES), the medicine injection control unit 202 stops the output of the drive signal to the medicine supply device 134 and ends the auxiliary medicine injection processing. Thereby, the process of this flowchart is complete | finished (it transfers to step ST306).

  On the other hand, in step ST310 (step ST308: NO), the medicine injection control unit 202 determines whether or not the auxiliary medicine injection processing has ended. In this step ST310, when it is determined by the drug injection control unit 202 that the auxiliary drug injection process has ended (YES), the process of this flowchart ends (the process proceeds to step ST306). Thus, if the blow process is not executed during the execution period of the auxiliary drug injection process, the process of this flowchart ends without ending the auxiliary drug injection process halfway.

  In step ST310, when the chemical injection control unit 202 determines that the auxiliary chemical injection processing has not ended (NO), the process returns to step ST308.

  According to the water treatment system 1 of this embodiment mentioned above, there exist the following effects, for example.

  In the water treatment system 1, the execution of the chemical injection process is waited (stopped) during the execution of the blow process, and the execution of the chemical injection process is interrupted (stopped) when the blow process is executed during the execution of the chemical injection process. Let Therefore, it is avoided that the blow process and the chemical injection process are executed at the same time, and the chemical supplied in the chemical injection process is not immediately discharged out of the system together with a part of the circulating water W2. Therefore, according to the water treatment system 1, it can suppress that a chemical | medical agent is consumed wastefully by the next blow process started during execution of the stopped chemical injection process.

  Moreover, in the water treatment system 1, when the chemical injection process is interrupted by the blow process, the chemical injection process is resumed after the blow process is executed, and the medicine that has not been supplied by the interrupted chemical injection process is input. The total amount of the amount of medicine and the amount of medicine input proportional to the amount of makeup water during the blow processing period is supplied to the circulating water W2. Therefore, according to the water treatment system 1, even when the next blow process is executed during the execution of the stopped chemical injection process, the necessary amount of medicine is promptly supplied to the circulating water W2 after the blow process is executed. can do.

In the water treatment system 1, when the cooling tower 120 is in operation and the residence time T _T during which the makeup water W 1 is not supplied to the cooling tower 120 exceeds the allowable residence time T _W , the chemical supply device 134. A supplementary medicine injection process is executed at. Therefore, the water treatment system 1 can effectively suppress the deterioration of the water quality of the circulating water W2 when the load on the apparatus to be cooled 131 is low.

  In the water treatment system 1, the bactericide is supplied from the chemical supply device 134 to the circulating water W <b> 2 in the auxiliary drug injection process. In general, when the replenishment water W1 is not supplied to the cooling tower 120 for a long time during the operation of the cooling tower 120, the consumption of the scale preventive agent and the anticorrosive agent is small, but the fungicide is consumed due to the growth of fungi. However, in the water treatment system 1, when the replenishment water W1 is not supplied to the cooling tower 120 for a long time during the operation of the cooling tower 120, the sterilizing agent is supplied to the circulating water W2 in the auxiliary chemical injection process. Therefore, the deterioration of the water quality of the circulating water W2 can be suppressed more effectively.

  In addition, the water treatment system 1 can adjust the required amount of the drug following the change in the concentration factor of the circulating water W2. Therefore, the water treatment system 1 uses the chemical wastefully while maintaining the chemical maintenance concentration of the circulating water W2 appropriately even if the electrical conductivity of the makeup water W1 and the circulating water W2 fluctuates during the operation of the cooling tower 120. Can be suppressed.

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

  In this embodiment, the cooling tower 120 which has the circulating water line L110 was demonstrated to the example as industrial equipment which has a circulating water system. Not only this example, but the industrial equipment having a circulating water system may be, for example, a boiler device or an RO device (reverse osmosis membrane device).

  In the case of a boiler device, for example, in a multi-tube type once-through boiler, the steam-water mixture generated in the boiler body is separated into steam and saturated water by a steam-water separator connected to the upper header, and the saturated water is separated into a precipitation pipe ( It is configured to return to the lower header by a circulating water system. Therefore, in this type of boiler apparatus, a process of discharging a part of the water flowing through the circulating water system and introducing makeup water supplied from the outside into the boiler body can be regarded as a blow process.

  In addition, in the case of the RO device, in order to secure the flow velocity at the membrane surface on the primary side, in general, a part of the concentrated water discharged out of the system is passed through the concentrated water recovery line (circulating water system). A cross-flow method is used to return to the raw water suction side. Therefore, in the cross-flow type RO apparatus, a process of discharging a part of the concentrated water flowing through the circulating water system and introducing the raw water supplied from the outside into the RO apparatus can be regarded as a blow process.

  In this embodiment, the example which supplies a chemical | medical agent to the circulating water supply line L111 was demonstrated. However, the position for supplying the drug is not limited to this example as long as the drug can be supplied to the cooling tower 120 as industrial equipment. For example, the chemical may be supplied to the watering part (not shown), the storage part 122 or the circulating water recovery line L112 of the cooling tower 120. Further, the medicine may be supplied to the makeup water W1, or may be supplied to both the makeup water W1 and the circulating water W2.

  In the present embodiment, an example (forcible replenishment) in which part of the circulating water W2 is discharged out of the system from the cooling tower 120 by forcibly supplying the replenishment water W1 to the cooling tower 120 as the blow processing has been described. As another blow process, for example, a drain valve is provided in the drain line L130, and the drain valve is opened to forcibly discharge the circulating water W2 from the cooling tower 120 to the outside of the system, thereby supplying the makeup water W1 to the cooling tower 120. (Forced drainage). In this case, the upstream end of the drain line L130 is connected to the bottom of the reservoir 122 (see FIG. 1).

  Moreover, you may discharge | release a part of circulating water W2 out of the system from the circulating water line L110 as a blow process. Moreover, you may discharge | emit a part of circulating water W2 out of the system from both the cooling tower 120 and the circulating water line L110 as a blow process.

  In this embodiment, the example which connected the 1st electrical conductivity sensor 133 as a water quality detection means to the circulating water supply line L111 was demonstrated. Not only this but the 1st electric conductivity sensor 133 may be connected to circulating water recovery line L112, or may be arranged in storage part 122.

  In the present embodiment, an example in which an electromagnetically driven diaphragm type metering pump is used as a medicine supply pump (not shown) of the medicine supply apparatus 134 has been described. Not limited to this example, a fixed amount delivery pump such as a plunger pump or a bellows pump may be used as the medicine supply pump.

  In the present embodiment, an example in which the cooling tower 120 is configured as an open cooling tower has been described. Not limited to this example, the cooling tower 120 may be configured as a hermetic cooling tower.

1 Water Treatment System 100 System Controller 120 Cooling Tower (Industrial Equipment)
131 Cooled Device 132 Circulating Water Pump 133 First Electric Conductivity Sensor (Water Quality Detection Means)
134 Drug supply device (medicine supply means)
135 Flow rate sensor (flow rate detection means)
136 Makeup water valve (blow means)
137 Water tap (blow means)
138 Inlet (Blowing means)
139 Second electric conductivity sensor 200 Control unit 201 Blow process control unit 202 Medicine injection control unit (medicine supply control unit)
203 Timekeeping unit 300 Memory (storage unit)
L110 Circulating water line L120 Makeup water line L130 Drainage line W1 Makeup water W2 Circulating water

Claims (5)

Industrial equipment with a circulating water system;
Flow rate detection means for outputting the amount of makeup water supplied to the industrial facility as a detected water amount value;
A medicine supply means capable of executing a medicine supply process for supplying medicine to the industrial facility;
Water quality detection means for outputting the quality of water flowing through the circulating water system of the industrial facility as a detected water quality value;
Blow means capable of performing a blow process for discharging a part of the water flowing through the circulating water system from within the industrial facility and supplying makeup water from the outside into the industrial facility;
In accordance with the detected water quality value output from the water quality detection means, a blow process control unit that performs a blow process in the blow means,
A medicine supply control unit that causes the medicine supply means to execute the medicine supply process so that an amount of medicine proportional to the detected water amount output from the flow rate detection means is supplied to the industrial facility;
A storage unit that stores an amount of medicine that has not been supplied from the medicine supply means to the industrial facility in the medicine supply process,
The medicine supply control unit (i) waits for the execution of the medicine supply process if the blow process is being executed, and detects the detected water amount during the execution period of the blow process after the blow process is executed. The medicine supply means is caused to execute the medicine supply process so that an amount of medicine proportional to the value is supplied to the industrial facility, and (ii) during the execution of the medicine supply process, the next blow process is performed. If executed, the execution of the medicine supply process is interrupted, and the amount of the medicine that has not been supplied to the industrial equipment in the medicine supply process is stored in the storage unit, and the next blow process is performed. After the execution of the above, the amount of the medicine, which is the sum of the amount of medicine input stored in the storage unit and the amount of medicine input proportional to the detected water amount value detected during the execution period of the next blow process, is Industrial equipment As supplied, to perform the drug supply process in the medicine supply means,
Water treatment system. The medicine supply control unit is configured to perform the medicine supply in the medicine supply means when the industrial equipment is in operation and the period during which no makeup water is supplied to the industrial equipment exceeds a preset allowable period. Execute supply processing,
The water treatment system according to claim 1. The drug supply means supplies a bactericide as a drug supplied to the industrial facility in the drug supply process.
The water treatment system according to claim 2. The drug supply control unit determines the amount of drug input,
Calculated based on the formula: amount of drug input = detected water amount of makeup water × drug maintenance concentration / concentration ratio of circulating water / drug specific gravity,
The water treatment system as described in any one of Claims 1-3. The industrial equipment is a cooling tower that is supplied with makeup water, cools the makeup water as circulating water, and supplies the cooled circulating water to the apparatus to be cooled.
The water quality detection means is a first electrical conductivity detection means for outputting the electrical conductivity of circulating water as a first detected electrical conductivity value,
A second electrical conductivity detecting means for outputting the electrical conductivity of the makeup water as a second detected electrical conductivity value;
The medicine supply control unit determines the concentration rate of the circulating water,
Concentration magnification = calculated based on the formula of first detected electrical conductivity value / second detected electrical conductivity value,
The water treatment system according to claim 4.

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