JP2014061493A - 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 started during execution of halted chemical-feeding processing.SOLUTION: A water treatment system includes: industrial equipment; chemical agent supply means 134; water quality detection means 133; blowing means; a blowing processing control part 201; and a chemical agent supply control part 202 which executes chemical agent supply processing in the chemical agent supply means 134 so as to supply the industrial equipment with a chemical agent of the necessary charge amount at the execution timing when the chemical agent supply processing does not overlap blowing processing. If the blowing processing is executed before the chemical agent supply processing is finished, the chemical agent supply control part 202 halts execution of the chemical agent supply processing and, after execution of the blowing processing, executes the chemical agent supply processing so as to supply the industrial equipment with the chemical agent of the charge amount which is not supplied to the industrial equipment due to halt of the chemical agent supply processing or the chemical agent of the total amount of the charge amount which is not supplied to the industrial equipment due to halt of the chemical agent supply processing and the necessary charge amount caused by execution of the 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, if circulating water is circulated continuously, the concentration rate of circulating water will become high gradually and water quality will deteriorate. Therefore, in order to improve the quality of the circulating water, fresh water (make-up water) is regularly replenished from the outside, and a part of the circulating water having a high concentration ratio 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 relates to industrial equipment having a circulating water system, chemical supply means capable of executing a chemical supply process for supplying chemicals to the industrial equipment, and the quality of water flowing through the circulating water system of the industrial equipment. Water quality detection means for outputting as a value, and blow means for discharging a part of the water circulating in the circulating water system from within the industrial equipment and capable of performing a blow process for introducing makeup water from the outside into the industrial equipment And a blow process control unit for executing a blow process in the blow means according to a detected water quality value in the water quality detection means, and a necessary input amount of medicine at the execution timing not overlapping with the blow process. A medicine supply control section that causes the medicine supply means to execute the medicine supply process so that the medicine supply means is connected to the medicine supply means. If the blow process is executed before the medicine supply process is finished, the execution of the medicine supply process is stopped, and the industrial equipment is stopped by the stop of the medicine supply process after the blow process is executed. The sum of the amount of the medicine that was not supplied to the product, or the amount of the medicine that was not supplied to the industrial equipment due to the stop of the medicine supply process, and the amount of the input that was required by the execution of the blow process The present invention relates to a water treatment system that causes the medicine supply means to execute the medicine supply process so that an amount of the medicine is supplied to the industrial facility.

  The industrial equipment is preferably a cooling tower that is supplied with makeup water, supplies the makeup water as circulating water to a cooled device, and cools the circulating water returned from the cooled device. .

  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 by the flow rate proportional chemical injection in the water treatment system. It is a time chart which shows the timing which performs a chemical injection process by blow following chemical injection in the water treatment system. It is a time chart which shows the timing which performs a chemical injection process by interval chemical injection 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.

  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 device to be cooled 131, an electrical conductivity sensor 133 as water quality detection means, a drug supply device 134 as drug supply means, and a flow rate. The sensor 135 and the system control apparatus 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 electrical conductivity sensor 133 is a device that measures electrical conductivity EC as the water quality of the circulating water W2. The 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 electrical conductivity sensor 133 is electrically connected to the system control device 100. The electrical conductivity EC measured by the electrical conductivity sensor 133 is transmitted as a detection signal to the system controller 100 as a detected water quality value. The electrical conductivity sensor 133 measures the electrical conductivity EC at a predetermined time interval (or real time) and transmits it to the system controller 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 connecting portion J4 is disposed between the supply source (not shown) of the makeup water W1 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 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.

  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 / close state (open / closed state) of the valve body in the makeup water valve 136 is controlled by a valve drive signal from the system control device 100 (blow process 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. The drainage line L130 uses the water treatment system 1 to circulate the circulating water W2 overflowing from the storage unit 122 of the cooling tower 120 when the make-up water valve 136 is opened and the make-up water W1 is forcibly supplied in the blow process described later. 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 an electrical conductivity sensor 133 and a flow 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 and a medicine injection control unit 202 as a medicine supply control unit. The functions of the blow processing control unit 201 and the chemical injection control unit 202 in the control unit 200 are realized by a microprocessor (not shown) including a CPU and an internal memory.

When the electrical conductivity EC of the circulating water W2 detected by the electrical conductivity sensor 133 is equal to or higher than the upper limit threshold _ECb1 as a preset allowable water quality value, the blow processing control unit 201 makes a makeup water valve 136. To control 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 make-up water valve 136 when the electrical conductivity EC ≧ the upper limit threshold EC _b1 , that is, when the quality of the circulating water W2 deteriorates, and makes the second supply Fresh makeup water W1 is forcibly replenished to the reservoir 122 through the 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 blow process is executed, a part of the concentrated circulation water W2 is replaced with the makeup water W1, so that the electrical conductivity EC of the circulation water W2 in the circulation water line L110 is reduced as a whole.

Then, the blow processing control unit 201 opens the makeup water valve 136 and then sets the makeup water valve 136 when the electrical conductivity EC ≦ the lower limit threshold EC _b2 is satisfied, that is, when the water quality of the circulating water W2 is restored. 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 mainly for notifying the medicine injection control unit 202 of the start 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.

  The medicine injection control unit 202 causes the medicine supply device 134 to execute the medicine injection process so that a necessary amount of medicine is supplied to the circulating water W2 at an execution timing that does not overlap with the blow process. In addition, when the blow process is executed before the chemical injection process by the medicine supply device 134 is completed, the chemical injection control unit 202 stops the execution of the chemical injection process, and after executing the blow process, (i ) Necessary amount of chemicals not supplied to circulating water W2 due to stop of chemical injection processing, or (ii) Input amount not supplied to circulating water W2 due to stop of chemical injection processing, and required by execution of blow processing The chemical injection process is executed in the chemical supply device 134 so that the total amount of the chemical added to the input amount is supplied to the circulating water W2.

Hereinafter, the control of the chemical injection process in the chemical injection control unit 202 will be described in detail.
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 proportional 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 (stops) the execution of the chemical injection process in the medicine supply device 134 until the blow process is completed. In the medicine supply device 134, a medicine injection process is executed so that an amount of medicine in proportion to the amount of makeup water detected therein is supplied to the circulating water W2. That is, the medicine injection control unit 202 causes the medicine supply device 134 to execute the medicine injection process so that a necessary amount of medicine is supplied to the circulating water W2 at an execution timing that does not overlap with the blow process.

  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 chemical injection process, the chemical injection control unit 202 interrupts (stops) the execution of the chemical injection process by the drug supply device 134. Here, the medicinal injection control unit 202 stores in the memory 300 the amount of the medicine that has not been supplied to the circulating water W2 due to the stop of the medicinal 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.

  That is, the chemical injection control unit 202 in the present embodiment, after the execution of the blow process, as the function (ii) described above, the amount of input that was not supplied to the circulating water W2 due to the stop of the chemical injection process, and the blow process The chemical supply process is executed in the chemical supply device 134 so that the total amount of the chemical required for the execution is supplied to the circulating water W2.

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 electrical conductivity EC (updated value) measured by the electrical conductivity sensor 133, the upper limit threshold EC _b1 (set value) that is the start point of the blow process, and the lower limit threshold that is the end point of the blow process EC _b2 (set value), the number P of pulse signals counted by the medicinal injection control unit 202, the amount of medicine that has not been supplied to the circulating water W2 due to the interruption of the medicinal injection process, and the like are stored.

  Next, the timing at which the chemical injection control unit 202 executes the chemical injection processing by flow rate 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 in the flow 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, “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. In addition, the waveform shown in FIG. 3 shows each time interval with a conceptual length, and does not correspond to an actual time interval. Further, 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 (the same applies to FIGS. 4 and 5 described later).

  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 pump 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.

Next, as shown in FIG. 3C, when the next blow process B is executed while the chemical injection process a is being executed, the chemical injection control unit 202 continues until the blow process B ends. The output of the drive signal to the medicine supply device 134 is stopped, and the execution of the medicine injection process a is interrupted. 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 input so that the total amount of medicine input amount Q ₂ proportional to the number of pulse signals P (make-up water amount q ₂ ) detected during the execution period is supplied to the circulating water W2. A drive signal having a pulse width corresponding to Q _X + Q ₂ is output. Thereby, in the medicine supply device 134, the medicine injection process a ′ is executed (resumed).

That is, the chemical injection control unit 202 in the present embodiment, after the execution of the blow process B, as the function (ii) described above, with the input amount Q _X not supplied to the circulating water W2 due to the stop of the chemical injection process a. , so that the amount Q _X of ₊ Q ₂ agents the sum of the charged amount Q ₂ to which was necessitated by the execution of the blowing process B is supplied to the circulating water W2, perform the dosing process a'in the drug supply device 134 Let

  In addition, the chemical injection process applied to the water treatment system 1 of this embodiment is not limited to the flow rate proportional chemical injection mentioned above. For example, it is also possible to apply a blow follow-up medicine injection that supplies the circulating water W2 with an amount of medicine that is proportional to the amount of makeup water W1 during the blowing process or the duration of the blowing process after the blowing process. It is also possible to apply interval medicine injection that alternately measures the medicine injection time and the medicine injection interval of the medicine supply pump and supplies a predetermined amount of medicine to the circulating water W2 during the medicine injection time. Hereinafter, a case where blow follow-up medicine injection and interval medicine injection are applied as the medicine injection processing of the water treatment system 1 will be described.

  First, the timing at which blow follow-up drug injection is executed in the drug injection control unit 202 will be described. FIG. 4 is a time chart when the chemical injection process is performed by blow following chemical injection in the water treatment system 1.

FIG. 4A is a time chart in the case of performing the chemical injection process after the blow process is performed in the blow following chemical injection. FIG. 4B is a time chart when the next blow process is executed during the execution of the chemical injection process. In addition, in the chemical injection operation shown in FIG. 4, the injection amount Q (Q ₁ , Q _2, etc.) of the medicine supplied to the circulating water W2 is indicated by a pulse width (time) proportional to the input amount.

As shown in FIG. 4A, after the blow process A is performed, the drug injection control unit 202 causes the drug supply device 134 to execute the drug injection process a. During the execution of the blow process A, the open time of the makeup water valve 136 is measured by a timer unit (not shown) of the control unit 200 and stored in the memory 300 as the execution time T ₁ of the blow process A. Dosing control unit 202, after execution of the blowing process A, the execution time T ₁ of the timed blown process A retrieves from the memory 300 by the time measuring unit, input amount of the drug in proportion to the execution time T ₁ of the blow process A A pump drive signal having a pulse width corresponding to Q ₁ is output to the medicine supply device 134. Thereby, the medicine supply pump of the medicine supply device 134 operates, and the medicine injection process a is executed.

Next, as shown in FIG. 4 (B), when the next blow process B is executed during the execution of the drug injection process a, the drug injection control unit 202 keeps the medicine supply device until the blow process B is completed. The output of the pump drive signal to 134 is stopped, and the execution of the medicine injection process a is interrupted (stopped). At this time, charged amount Q _X of drug that is not supplied to the circulating water W2 is stored in the memory 300 by the interruption of the dosing process a. Further, during the execution of the blow process B, open time of the supply water valve 136 is measured by the time measuring unit as the execution time T ₂ of the blowing process B. Measurement of the execution time T ₂ of the blow process B by timing unit is reset after the execution of the blow process B. Then, the execution time T ₂ of the blowing process B, which is measured by the time measuring unit is stored in the memory 300.

After the execution of the blow process B, the medicinal injection control unit 202 performs the injection amount Q _X of the medicine not supplied to the circulating water W2 due to the interruption of the medicinal process a and the execution time of the blow process B timed by the time measuring unit. T ₂ is acquired from the memory 300. Then, the medicine injection control unit 202 stores the amount of medicine (Q _X + Q ₂ ) that is the sum of the medicine dosage Q _X and the medicine dosage Q ₂ proportional to the execution time T ₂ of the blow process B. A pump drive signal having a pulse width corresponding to the total amount of medicine (Q _X + Q ₂ ) is output to the medicine supply device 134 so as to be supplied to the circulating water W2. Thereby, in the medicine supply device 134, the medicine injection process a ′ is executed (resumed).

That is, the chemical injection control unit 202 in this example, after the execution of the blow process B, as the function (ii) described above, the input amount Q _X not supplied to the circulating water W2 due to the stop of the chemical injection process a, In the medicine supply device 134, the medicine injection process a ′ is executed so that the amount Q _X + Q ₂ of the total amount of the input amount required by the execution of the blow process B and Q ₂ is supplied to the circulating water W2. .

  Next, the timing for executing the interval medicine injection in the medicine injection control unit 202 will be described. FIG. 5 is a time chart in the case of executing the chemical injection process by the interval chemical injection in the water treatment system 1.

FIG. 5 (A) is a time chart in the case where time measurement of the medicine injection time is started during the execution of the blow process in the interval medicine injection. FIG. 5B is a time chart when the next blow process is executed during the execution of the chemical injection process. In the chemical injection operation shown in FIG. 5, the input amount Q (Q ₁ , Q _X, etc.) of the medicine supplied to the circulating water W2 is indicated by a pulse width (time) proportional to the input amount. Further, in FIG. 5A, the amount of drug input corresponding to the drug input time T ₁ is Q ₁ .

In FIG. 5 (A), as shown in the time chart of dosing operation, dosing control unit 202 executes the medicine input time period dosing process T _1, drugs for a period of drug loading interval T ₂ Note The control of stopping the process is repeated alternately. The drug charging time T ₁ and the drug charging interval T ₂ are measured by a timer unit (not shown) of the control unit 200.

As shown in FIG. 5 (A), dosing control unit 202 during the execution of the blowing process A, when the counting of the drug on time T ₁ is being started by the time measuring unit, the execution of the dosing process a Wait (stop). Note that while is waiting to execute the dosing process a well, counting the drug on time T ₁ by timing unit continues. In addition, the time counting unit starts counting the overlap time _TL .

Then, after the execution of the blow process A, the medicine injection control unit 202 is supplied with the medicine including the input amount Q _X corresponding to the overlap time T _L (hatched portion in the figure) measured by the time measuring unit. In this manner, the medicine supply process 134 is executed in the medicine supply device 134.

Dosing process a is normally initiated in accordance with the medicine input time T _1, in this case, it is started after the execution of the blowing process A. Also, dosing process a is normally terminated in accordance with the medicine input time T _1, in this case, after a drug on time T _1, is further supplied drug dosages Q _X is the circulating water W2 The

Next, as shown in FIG. 5B, when the next blow process B is executed during the execution of the drug injection process a, the drug injection control unit 202 keeps the medicine supply device until the blow process B is completed. The output of the drive signal to 134 is stopped, and the execution of the medicine injection process a is interrupted (stopped). Incidentally, while it suspends the execution of the dosing process a well, counting the drug on time T ₁ by timing unit continues. In addition, the time counting unit starts counting the overlap time _TL .

The dosing control unit 202, after execution of the blowing process B, the input amount Q _X of drug that is not supplied to the circulating water W2 in one execution period of the previous blowing process A, the next blow process B as the amount of drug during the period the sum of the input amount Q _Y of drugs in accordance with the timed overlap time T _L is supplied to the circulating water W2, the pulse corresponding to the total amount Q _{X +} Q _Y drugs A pump drive signal having a width is output to the medicine supply device 134. Thereby, in the chemical | medical agent supply apparatus 134, the chemical injection process a is performed as the chemical injection process a '.

That is, the chemical injection control unit 202 in this example, after the execution of the blow process B, as the function (i) described above, is the amount Q _X + Q _Y that is not supplied to the circulating water W2 due to the stop of the chemical injection process a. The chemical injection process a ′ is executed in the chemical supply device 134 so that the chemical is supplied to the circulating water W2.

Incidentally, as shown in FIG. 5 (B), the dosing process a, when the input amount Q _Z of drug supplied to the circulating water W2 between the blowing process A and blow process B, the execution of the blowing process B After that, the chemical injection process a ′ with the total amount Q _X + Q _Y of the medicine is executed, so that all of the medicine with the input amount Q ₁ corresponding to the medicine input time T ₁ is supplied to the circulating water W2. Become.

  Next, in the water treatment system 1 of the present embodiment, the operation of the blowing process executed by the control unit 200 and the chemical injection process by the flow rate proportional chemical injection will be described with reference to the flowcharts of FIGS. 6 and 7.

  First, the blow process control will be described. FIG. 6 is a flowchart showing a processing procedure when the control of the blow process is executed by the control unit 200. 6 is executed by the blow process control unit 201 of the control unit 200 based on a 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 ST101 shown in FIG. 6, the blow processing control unit 201 acquires from the memory 300 the electrical conductivity EC of the circulating water W2 measured by the electrical conductivity sensor 133 and the upper limit threshold EC _b1 that is the starting point of the blow processing. To do.

In step ST102, the blow process control unit 201 determines whether or not the electrical conductivity EC is equal to or higher than the upper limit threshold EC _b1 . In step ST102, when the blow process control unit 201 determines that the electrical conductivity EC ≧ the upper limit threshold EC _b1 (YES), the concentration ratio of the circulating water W2 has reached the predetermined concentration ratio, and thus the process is performed. Moves to step ST103. In Step ST102, when the blow process control unit 201 determines that the electrical conductivity EC <the upper limit threshold EC _b1 (NO), the concentration rate of the circulating water W2 has not reached the predetermined concentration rate. Therefore, 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. Since it is discharged, the electrical conductivity EC of the circulating water W2 gradually decreases.

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

In step ST105, the blow process control unit 201 determines whether or not the electrical conductivity EC is equal to or lower than the lower limit threshold EC _b2 . In this step ST105, when it is determined by the blow processing control unit 201 that the electrical conductivity EC ≦ the lower limit threshold EC _b2 (YES), it is considered that the concentration rate of the circulating water W2 has sufficiently decreased. The process proceeds to step ST106. In step ST105, when the blow process control unit 201 determines that the electrical conductivity EC> the lower limit threshold EC _b2 (NO), it is considered that the concentration rate of the circulating water W2 has not decreased. 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. 7 is a flowchart illustrating a processing procedure when the control of the chemical injection process is executed by the control unit 200. The control of the flowchart shown in FIG. 7 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 is repeatedly performed during the operation of the water treatment system 1.

  In step ST201 shown in FIG. 7, 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 chemical 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. 7). 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, the execution of the medicine injection process is in a standby (stopped) 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).

  If the next blow process is started while the medicine injection process is being executed in step ST203, the process proceeds to the process of step ST204 described 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).

  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, when the next blow process is further executed while the stopped chemical injection process is being executed after the blow process is executed, the chemical injection process is stopped. 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 blow process started during execution of the stopped chemical injection process.

  Further, in the water treatment system 1, when the next blow process is further performed while the stopped chemical injection process is being performed after the blow process is performed, the next process is performed after the blow process is performed. The chemical injection process is performed such that the amount of medicine that has not been supplied to the circulating water W2 by the blowing process 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.

  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 (primary 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 where the drug is supplied is not limited to this example as long as the drug can be supplied to the cooling tower 120. 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 electrical conductivity sensor 133 as a water quality detection means to the circulating water supply line L111 was demonstrated. Not limited to this, the electrical conductivity sensor 133 may be connected to the circulating water recovery line L112, or may be arranged in the reservoir 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 Electric conductivity sensor (Water quality detection means)
134 Drug supply device (medicine supply means)
136 Makeup water valve (blow means)
137 Water tap (blow means)
138 Inlet (Blowing means)
200 Control Unit 201 Blow Process Control Unit 202 Chemical Injection Control Unit (Drug Supply Control Unit)
300 Memory L110 Circulating water line L120 Makeup water line L130 Drain line W1 Makeup water W2 Circulating water

Claims (2)

Industrial equipment with a circulating water system;
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 introducing makeup water from the outside into the industrial facility;
In accordance with the water quality value detected by the water quality detection means, a blow processing 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 a necessary amount of medicine is supplied to the industrial facility at an execution timing that does not overlap with the blow process,
The medicine supply control unit
If the blow process is executed before the medicine supply process by the medicine supply unit is finished, the execution of the medicine supply process is stopped, and after the blow process is executed, the medicine supply process is stopped. The amount of medicine that was not supplied to the industrial facility, or the amount of input that was not supplied to the industrial facility due to the stop of the chemical supply process, and the amount of input that was required by the execution of the blow process The chemical supply process is executed in the chemical supply means so that the total amount of the chemical is supplied to the industrial facility.
Water treatment system. The industrial facility is a cooling tower that is supplied with makeup water, supplies the makeup water as circulating water to a cooled device, and cools the circulating water returned from the cooled device.
The water treatment system according to claim 1.

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