JPWO2019106927A1 - Liquid distribution system, processing line, and liquid distribution method - Google Patents

Abstract

The drain distribution system 100 includes a tank 2, a pumping mechanism 5 for pumping the drain of the tank 2, and a supply destination of the drain pressure-fed from the pumping mechanism 5, a boiler 61 which is a normal supply destination, and a separate boiler 61. A switching valve 51a for switching between the intermediate tank 62, a water quality sensor 3 for detecting the water quality of the drain, a cleaning unit 4 for supplying a cleaning liquid to the tank 2, and a control unit 7. When the water quality satisfies the water quality standard, the control unit 7 controls the switching valve 51a to set the supply destination of the drain to the boiler 61, while when the water quality of the drain does not satisfy the water quality standard, the switching valve 51a Is set to the intermediate tank 62 and the cleaning unit 4 supplies the cleaning liquid to the tank 2.

Description

  The technology disclosed herein relates to a liquid distribution system, a processing line, and a liquid distribution method.

  Conventionally, a system for circulating a liquid is well known. For example, Patent Document 1 discloses a system that collects drain and switches the supply destination of the collected drain. The system disclosed in Patent Document 1 detects whether or not the processing liquid is mixed in the collected drain, and when the processing liquid is mixed in the drain, the drain supply destination is set to the drainage pipe. On the other hand, when the treatment liquid is not mixed in the drain, the drain supply destination is set to the circulation pipe.

JP 2008-82565 A

  By the way, when the quality of the liquid to be circulated deteriorates, as in the case where the processing liquid is mixed into the drain, the equipment that constitutes the system, and further the equipment that is supplied with the liquid from the system has the quality. May be adversely affected by bad liquids. In such a case, the adverse effect on the above-described device can be reduced by changing the supply destination of the poor quality liquid to the supply destination of the good quality liquid.

  However, when the quality of the liquid deteriorates, it is desired not only to avoid adverse effects on the equipment but also to restore the original state at an early stage.

  The technique disclosed herein is to restore the system early when the quality of the liquid deteriorates.

  The liquid distribution system disclosed herein includes a tank that stores liquid, a pressure feeding mechanism that pumps the liquid in the tank, and a supply destination of liquid fed from the pressure feeding mechanism as a first supply that is a normal supply destination. A first switching mechanism that switches between a first supply destination and a second supply destination that is different from the first supply destination, a detection unit that detects liquid quality, a cleaning unit that supplies a cleaning liquid to the tank, and the first switching unit And a control unit that controls the cleaning unit, and the control unit controls the first switching mechanism to control the liquid when the quality of the liquid detected by the detection unit satisfies a predetermined quality standard. If the quality of the liquid detected by the detection unit does not satisfy the quality standard, the first switching mechanism is controlled to set the liquid supply destination to the first supply destination. Set as the second supply destination and the cleaning Wherein to supply the cleaning liquid to the tank.

  The processing line disclosed here has a heat exchanger that performs heat exchange with a processing liquid that performs a predetermined processing on an object, and transports the object to the processing tank that stores the processing liquid and the processing tank. A heating mechanism that supplies a heat medium to the heat exchanger and collects the heat medium from the heat exchanger; and a determination unit that determines abnormality of the processing tank. Includes the liquid distribution system according to any one of claims 1 to 4, and the determination unit performs the processing when the quality of the liquid detected by the detection unit does not satisfy the quality standard. It is determined that an abnormality has occurred in the tank.

  The liquid distribution method disclosed herein is a liquid distribution method for supplying a liquid stored in a tank to a predetermined supply destination by a pumping mechanism, and a step of detecting the quality of the liquid, and the quality of the liquid is a predetermined quality. If the standard is satisfied, the step of setting the liquid supply destination by the pressure feeding mechanism to the first supply destination which is a normal supply destination; and if the quality of the liquid does not satisfy the quality standard, And a step of setting a supply destination to a second supply destination different from the first supply destination and supplying a cleaning liquid to the tank.

  According to the liquid distribution system, when the quality of the liquid deteriorates, the system can be restored early.

  According to the liquid distribution method, the system can be restored early when the quality of the liquid deteriorates.

According to the processing line, when the quality of the liquid deteriorates, the system can be restored at an early stage, and an abnormality in the processing line can be determined.
be able to.

FIG. 1 is a configuration diagram showing an outline of a processing line. FIG. 2 is a piping diagram showing an outline of the drain distribution system. FIG. 3 is a flowchart of the distribution control of the control unit.

  Hereinafter, exemplary embodiments will be described in detail with reference to the drawings.

  FIG. 1 is a configuration diagram showing an outline of the processing line 9. The processing line 9 is incorporated in a part of the production line. The processing line 9 performs a predetermined process on the object S with a processing liquid. The processing line 9 includes a heat exchanger 95 that performs heat exchange with the processing liquid, the processing tank 91 that stores the processing liquid, the transport mechanism 92 that transports the object S to the processing tank 91, and the heat exchanger 95. A heat medium distribution system 200 that supplies steam and collects drain from the heat exchanger 95 and a determination unit 93 that determines abnormality of the processing tank 91 are provided. For example, the object S is a metal product, and the treatment line 9 performs surface treatment on the metal product. The surface treatment includes degreasing, washing, plating and the like. The processing line 9 may include a plurality of processing tanks 91 for degreasing, cleaning, plating, and the like. In that case, each treatment tank 91 stores a treatment liquid corresponding to the surface treatment.

  The heat exchanger 95 is formed of a heat transfer tube through which steam or drain flows. The heat exchanger 95 is disposed in the tank body 94 of the processing tank 91 so as to be immersed in the processing liquid. The heat exchanger 95 heats the treatment liquid by applying heat of steam or drain flowing through the inside to the treatment liquid, and adjusts the temperature of the treatment liquid to a predetermined temperature.

  The heat medium distribution system 200 collects the drain from the heat exchanger 95 and distributes it, the boiler 61 that generates steam from the drain supplied from the drain distribution system 100, the intermediate tank 62, and the drain. And a processing layer 63 that performs processing. The heat medium distribution system 200 supplies the steam generated by the boiler 61 to the heat exchanger 95 as a heat medium. The steam supplied to the heat exchanger 95 condenses into a drain while circulating in the heat exchanger 95. The heat medium distribution system 200 collects drain from the heat exchanger 95 and supplies the collected drain to the boiler 61 to generate steam.

  The drain distribution system 100 normally supplies the drain to the boiler 61. On the other hand, when drain purification is required, the drain distribution system 100 supplies the drain to the intermediate tank 62 and, consequently, the treatment tank 63. The boiler 61 is an example of a first supply destination, and the intermediate tank 62 is an example of a second supply destination.

  The determination unit 93 has a processor. The determination unit 93 determines an abnormality of the treatment tank 91 based on the water quality of the drain that flows through the drain circulation system 100. This determination will be described later.

  Next, the drain distribution system 100 will be described in detail. FIG. 2 is a piping diagram showing an outline of the drain distribution system 100.

  The drain circulation system 100 includes a tank 2 that stores drain, an inflow pipe 11 through which drain that flows into the tank 2 circulates, a pumping mechanism 5 that pumps the drain of the tank 2, and a supply of drain that is pumped from the pumping mechanism 5. A switching valve 51a for switching the tip between the boiler 61 and the intermediate tank 62, which are normal supply destinations, a water quality sensor 3 for detecting drain quality, that is, water quality, and a washing unit 4 for supplying washing water to the tank 2 The first valve 11 a and the second valve 12 a for switching the supply destination of the drain flowing through the inflow pipe 11 between the tank 2 and the intermediate tank 62, and the control unit 7 are provided. The drain distribution system 100 is an example of a liquid distribution system.

  The drain circulation system 100 collects and stores the drain in the tank 2 from the heat exchanger 95 and supplies the drain to the boiler 61 by the pumping mechanism 5. The boiler 61 generates steam from the supplied drain. The steam generated by the boiler 61 is supplied to various supply destinations. One of the supply destinations of the steam is a heat exchanger 95. On the other hand, the drain distribution system 100 monitors the water quality of the drain, and when the water quality of the drain deteriorates, the drain stored in the tank 2 is supplied not to the boiler 61 but to the intermediate tank 62, and further to cleaning. Wash tank 2 etc. with water.

  The drain that flows out from the heat exchanger 95 flows into the inflow pipe 11. The downstream end of the inflow pipe 11 is connected to the tank 2. The inflow pipe 11 is provided with a first valve 11a. The first valve 11a is an electric valve. When the first valve 11 a is open, the drain flowing through the inflow pipe 11 flows into the tank 2. When the first valve 11a is closed, the inflow pipe 11 is blocked and the inflow of drain into the tank 2 via the inflow pipe 11 is stopped. The inflow pipe 11 is an example of an inflow part.

  A branch pipe 12 branches from the inflow pipe 11. The downstream end of the branch pipe 12 is connected to a branch pipe 52 described later. The branch pipe 12 is provided with a second valve 12a. The second valve 12a is an electric valve. When the second valve 12 a is open, the drain flowing through the inflow pipe 11 flows into the branch pipe 12 and further flows into the intermediate tank 62 through the branch pipe 52. When the second valve 12a is closed, the branch pipe 12 is shut off, and the inflow of drain from the inflow pipe 11 to the branch pipe 12 and consequently the inflow of drain into the intermediate tank 62 is stopped.

  That is, the inflow destination of the drain that flows through the inflow pipe 11 is switched by the first valve 11a and the second valve 12a. The first valve 11a and the second valve 12a are an example of a second switching mechanism.

  The cleaning unit 4 includes a cleaning water pipe 41 through which cleaning water (for example, industrial water) circulates, and a third valve 41 a provided in the cleaning water pipe 41. The upstream end of the cleaning water pipe 41 is connected to a cleaning water supply source (not shown). The downstream end of the washing water pipe 41 is connected to a part of the inflow pipe 11 that is downstream of the part to which the branch pipe 12 is connected. The third valve 41a is an electric valve. When the third valve 41 a is open, the cleaning water flowing through the cleaning water pipe 41 flows into the inflow pipe 11 and further flows into the tank 2 through the inflow pipe 11. When the third valve 41a is closed, the cleaning water pipe 41 is shut off, and the inflow of cleaning water from the cleaning water pipe 41 to the inflow pipe 11 and thus the inflow of cleaning water to the tank 2 are stopped.

  The tank 2 stores drain that flows in through the inflow pipe 11. An outflow pipe 51 is connected to the tank 2. The drain stored in the tank 2 is discharged from the outflow pipe 51. The tank 2 is provided with a water level sensor 21 that detects the water level of the stored drain. The tank 2 is open to the atmosphere.

  The pressure feeding mechanism 5 is an electric pump. The pumping mechanism 5 pumps the drain stored in the tank 2 through the outflow pipe 51.

  The downstream end of the outflow pipe 51 is connected to the boiler 61. A branch pipe 52 is connected to the outflow pipe 51. The downstream end of the branch pipe 52 is connected to the intermediate tank 62. A switching valve 51a is provided in a portion of the outflow pipe 51 to which the branch pipe 52 is connected. The switching valve 51a is an electric three-way valve. The switching valve 51a causes the drain that has flowed through the outflow pipe 51 to flow through the outflow pipe 51 as it is (that is, to flow into the boiler 61) and into the branch pipe 52 (that is, into the intermediate tank 62). It is configured to be set to the second state. Further, the switching valve 51a also has a function of blocking the outflow pipe 51 and stopping the drainage of the outflow pipe 51. The switching valve 51a is an example of a first switching mechanism.

  The intermediate tank 62 stores drain that flows from the branch pipe 52. The intermediate tank 62 is open to the atmosphere. The intermediate tank 62 is connected to the processing tank 63 via the connection pipe 64. That is, the drain once stored in the intermediate tank 62 flows into the processing tank 63. In the treatment tank 63, the drain is purified. The drain purified in the treatment tank 63 is discarded.

  The water quality sensor 3 includes a first water quality sensor 31 that detects the water quality of the drain in the tank 2 and a second water quality sensor 32 that detects the water quality of the drain in the intermediate tank 62. The water quality sensor 3 is an example of a detection unit. The first water quality sensor 31 is an example of a first detection unit, and the second water quality sensor 32 is an example of a second detection unit.

  The first water quality sensor 31 includes a first pH sensor 33 that detects the pH of the drain, a first conductivity sensor 34 that detects the conductivity of the drain, and a first hardness sensor 35 that detects the hardness of the drain. Yes. The first pH sensor 33, the first conductivity sensor 34, and the first hardness sensor 35 are installed in the tank 2. The first water quality sensor 31 is used to detect that the water quality of the drain has deteriorated.

  The second water quality sensor 32 includes a second pH sensor 36 that detects the pH of the drain, a second conductivity sensor 37 that detects the conductivity of the drain, and a second hardness sensor 38 that detects the hardness of the drain. Yes. The second pH sensor 36, the second conductivity sensor 37, and the second hardness sensor 38 are installed in the intermediate tank 62. The second water quality sensor 32 is used to detect that the water quality of the drain has improved.

  The control unit 7 has a processor. Although not shown, the control unit 7 includes a water level sensor 21, a first pH sensor 33, a first conductivity sensor 34, a first hardness sensor 35, a second pH sensor 36, a second conductivity sensor 37, and a second hardness sensor. 38 detection results are input. The control unit 7 controls the first valve 11a, the second valve 12a, the third valve 41a, the switching valve 51a, and the pressure feeding mechanism 5.

  Hereinafter, the distribution control of the control unit 7 will be described in detail with reference to FIG. FIG. 3 is a flowchart of the distribution control of the control unit 7.

  First, the control part 7 performs the preparation for operating the drain distribution system 100 in step S1. Specifically, the control unit 7 opens the first valve 11a, closes the second valve 12a, closes the third valve 41a, sets the switching valve 51a to the first state, and stops the pressure feeding mechanism 5. . That is, the inflow pipe 11 communicates with the tank 2, the branch pipe 12 is blocked, and the outflow pipe 51 communicates with the boiler 61. Thereby, the drain flows into the tank 2 through the inflow pipe 11. That is, drain recovery is started. On the other hand, since the pumping mechanism 5 is stopped, the supply of drain from the tank 2 to the boiler 61 is not performed at this time.

  Then, the control part 7 performs the 1st water quality check of drain in step S2, S3. Specifically, the control unit 7 reads the detection results of the first pH sensor 33, the first conductivity sensor 34, and the first hardness sensor 35 (step S2), and the water quality of the drain of the tank 2 satisfies a predetermined first water quality standard. It is determined based on those detection results (step S3). The control unit 7 has the drain pH of the tank 2 within a predetermined first pH range, the conductivity of the drain of the tank 2 is within a predetermined first conductivity range, and the tank 2 When the drain hardness is within the predetermined first hardness range, it is determined that the drain water quality satisfies the first water quality standard. When at least one of the pH, conductivity, and hardness of the drain is out of the corresponding range, the control unit 7 determines that the water quality of the drain does not satisfy the first water quality standard.

  When the water quality of the drain of the tank 2 satisfies the first water quality standard, the control unit 7 operates the pressure feeding mechanism 5 in step S4. As a result, the drain of the tank 2 is pumped by the pumping mechanism 5 and supplied to the boiler 61 via the outflow pipe 51. That is, supply of the drain to the boiler 61 is started when the water quality of the drain of the tank 2 satisfies the first water quality standard.

  Then, the control part 7 returns to step S2, and performs a 1st water quality check. As long as the water quality of the drain of the tank 2 satisfies the first water quality standard, the control unit 7 repeats steps S <b> 2 to S <b> 4 and continues the recovery of the drain to the tank 2 and the supply of the drain to the boiler 61. In addition, when the pumping mechanism 5 is already operating in step S4, the control unit 7 does not need to perform special control, only to maintain the state.

  On the other hand, when the water quality of the drain of the tank 2 does not satisfy the first water quality standard, the control unit 7 closes the first valve 11a, opens the second valve 12a, and sets the switching valve 51a in the second state in step S5. And the pumping mechanism 5 is operated. When the pressure feeding mechanism 5 is already operating, the control unit 7 only maintains the state and does not perform any special control with respect to the pressure feeding mechanism 5. When the first valve 11a is closed and the second valve 12a is opened, the inflow of drain into the tank 2 via the inflow pipe 11 is stopped, and the drain flowing through the inflow pipe 11 flows into the intermediate tank 62. . By setting the switching valve 51 a to the second state, the supply destination of the drain that flows through the outflow pipe 51 is switched from the boiler 61 to the intermediate tank 62. In this state, the third valve 41a remains closed, that is, the cleaning water is not supplied to the tank 2.

  Thereafter, in step S6, the control unit 7 reads the detection result of the water level sensor 21, and determines whether or not the water level in the tank 2 is lower than a predetermined water level threshold L0. The water level threshold L0 is preferably the lowest possible water level, for example, the lowest water level that can be measured by the water level sensor 21.

  When the water level of the tank 2 is equal to or higher than the water level threshold L0, the control unit 7 waits for the water level of the tank 2 to become smaller than the water level threshold L0 by repeating Step S6. Since the inflow of the drain to the tank 2 is stopped, the washing water is not supplied to the tank 2, and the drain of the tank 2 is supplied to the intermediate tank 62 by the pressure feeding mechanism 5, so that the water level of the tank 2 gradually decreases. To go.

  When the water level of the tank 2 is lower than the water level threshold L0, the control unit 7 opens the third valve 41a in step S7. As a result, cleaning water is supplied to the tank 2. At this time, since the pumping mechanism 2 is operating, the wash water that has flowed into the tank 2 flows out from the outflow pipe 51 and is discharged to the intermediate tank 62. Until just before the cleaning liquid is supplied, drainage with poor water quality is circulated in the tank 2, the outflow pipe 51, the pressure feeding mechanism 5, and the switching valve 51a. Therefore, the inside of the tank 2, the outflow pipe 51, the pressure feeding mechanism 5, and the switching valve 51 a may be contaminated with drainage having poor water quality. As the washing water flows through the tank 2, the outflow pipe 51, the pressure feeding mechanism 5 and the switching valve 51a, the tank 2, the outflow pipe 51, the pressure feeding mechanism 5 and the switching valve 51a are washed with the washing water.

  Then, the control part 7 performs the 2nd water quality check of drain in step S8, S9. Specifically, the control unit 7 reads the detection results of the second pH sensor 36, the second conductivity sensor 37, and the second hardness sensor 38 (step S8), and the drain water quality of the intermediate tank 62 satisfies a predetermined second water quality standard. Whether or not it is satisfied is determined based on the detection results (step S9). The control unit 7 has the drain pH of the intermediate tank 62 within a predetermined second pH range, the drain conductivity of the intermediate tank 62 is within a predetermined second conductivity range, and When the drain hardness of the intermediate tank 62 is within the predetermined second hardness range, it is determined that the drain water quality satisfies the second water quality standard. If at least one of the pH, conductivity, and hardness of the drain is out of the corresponding range, the control unit 7 determines that the water quality of the drain does not satisfy the second water quality standard. The second water quality standard may be the same as or different from the first water quality standard. That is, the second pH range, the second conductivity range, and the second hardness range may be the same as or different from the first pH range, the first conductivity range, and the first hardness range, respectively. For example, the second water quality standard may be set more strictly than the first water quality standard.

  When the water quality of the drain of the intermediate tank 62 does not satisfy the second water quality standard, the control unit 7 repeats the processes of steps S8 and S9, that is, the second water quality check. Immediately after the start of washing, the washing water after washing contains drainage with poor water quality, so the quality of the washing water after washing is not good. Since the wash water after washing flows into the intermediate tank 62, it is highly possible that the drain water quality in the intermediate tank 62 does not satisfy the second water quality standard immediately after the start of washing. When the cleaning is continued for a while, the poor drainage water remaining in the tank 2, the outflow pipe 51, the pressure feeding mechanism 5 and the switching valve 51a is sufficiently washed away, and the quality of the cleaning water after the cleaning satisfies the second water quality standard. Can be. On the other hand, in addition to the washed water after washing, drain flowing through the inflow pipe 11 also flows into the intermediate tank 62. In the first place, the cause of the deterioration of the drain water quality in the drain distribution system 100 is that impurities (for example, the processing liquid in the processing tank 91) are mixed temporarily or continuously into the drain flowing in through the inflow pipe 11. It is mentioned. When such a drain inflow destination is switched to the intermediate tank 62, there is a high possibility that the water quality of the drain in the intermediate tank 62 does not satisfy the second water quality standard. That is, when the quality of the wash water after washing is improved and the cause of the water quality deterioration on the upstream side of the inflow pipe 11 is dealt with, the water quality of the intermediate tank 62 can satisfy the second water quality standard. . The control unit 7 waits for the water quality of both the washed water after washing and the drain flowing through the inflow pipe 11 to be improved by repeating steps S8 and S9.

  When the water quality of the drain in the intermediate tank 62 satisfies the second water quality standard, the control unit 7 opens the first valve 11a, closes the second valve 12a, closes the third valve 41a, and switches the switching valve in step S10. 51a is set to the first state. When the first valve 11a is opened, the second valve 12a is closed, and the third valve 41a is closed, the drainage flowing through the inflow pipe 11 flows into the tank 2, and the washing water is supplied to the tank 2. Inflow is stopped. Moreover, the supply destination of the drain which distribute | circulates the outflow pipe 51 is switched from the intermediate tank 62 to the boiler 61 by setting the switching valve 51a to a 1st state. That is, after the water quality of the drain is improved, the control unit 7 restarts the drain recovery to the tank 2 and the drain supply to the boiler 61.

  Then, the control part 7 returns to step S2, and repeats the process from the above-mentioned 1st water quality check.

  In this way, the drain circulation system 100 monitors the water quality of the drained water, and if the drain water quality meets the water quality standard (specifically, the first water quality standard), the drain is collected into the tank 2, The drain of the tank 2 is supplied to the boiler 61. On the other hand, when the water quality of the drain does not satisfy the water quality standard, the drain circulation system 100 stops collecting the drain into the tank 2, discharges the drain from the tank 2 to the intermediate tank 62, and supplies the washing water to the tank 2. Supply. As a result, it is possible to prevent drain having poor water quality from being supplied to downstream equipment of the drain distribution system 100, that is, downstream equipment including the boiler 61. In addition, since the tank 2 and the like can be cleaned, the drain distribution system 100 can be restored early. As a result of washing the tank 2 and the like, the drain water quality is improved, and when the drain water quality meets the water quality standard (specifically, the second water quality standard), the drain recovery to the tank 2 and the boiler 61 The drain supply is resumed.

  In addition, when it is determined that the water quality of the drain of the tank 2 does not satisfy the water quality standard, the control unit 7 transmits the determination result to the determination unit 93 of the processing line 9. When the determination unit 93 receives the determination result, the determination unit 93 determines that an abnormality has occurred in the processing tank 91 and issues an alarm to prompt the operator to check the processing tank 91.

  As described above, the drain circulation system 100 (liquid circulation system) includes the tank 2 that stores drain (liquid), the pressure feeding mechanism 5 that pumps the drain of the tank 2, and the supply destination of the drain that is pumped from the pressure feeding mechanism 5. Switch valve 51a (first switching mechanism) for switching between boiler 61 (first supply destination), which is a normal supply destination, and intermediate tank 62 (second supply destination) different from boiler 61, and the water quality of the drain A water quality sensor 3 (detection unit) that detects (quality), a cleaning unit 4 that supplies a cleaning liquid to the tank 2, and a control unit 7 that controls the switching valve 51a and the cleaning unit 4. When the drain water quality detected by the sensor 3 satisfies a predetermined water quality standard (quality standard), the switching valve 51a is controlled to set the drain supply destination to the boiler 61, while the water quality sensor 3 detects the drain water quality. If the quality of the lens does not meet the quality standards controls the switching valve 51a to supply the cleaning liquid to the tank 2 to the washing unit 4 sets the supply destination of the drain in the intermediate tank 62.

  In other words, the liquid distribution method in the drain distribution system 100 is a liquid distribution method in which the drain (liquid) stored in the tank 2 is supplied to a predetermined supply destination by the pumping mechanism 5, and the water quality (quality) of the drain is detected. And, when the water quality of the drain satisfies a predetermined water quality standard (quality standard), the process of setting the supply destination of the drain by the pumping mechanism 5 to the boiler 61 (first supply destination) which is a normal supply destination; When the water quality of the drain does not satisfy the water quality standard, the supply destination of the drain by the pressure feeding mechanism 5 is set to the intermediate tank 62 (second supply destination) different from the boiler 61 and the cleaning liquid is supplied to the tank 2. Process.

  According to this configuration, when the water quality of the drain satisfies the water quality standard, the drain stored in the tank 2 is supplied to the boiler 61 by the pumping mechanism 5. On the other hand, when the water quality of the drain does not satisfy the water quality standard, the supply destination of the drain stored in the tank 2 is switched from the boiler 61 to the intermediate tank 62, and the cleaning liquid is supplied to the tank 2 from the cleaning unit 4. That is, when the water quality of the drain is deteriorated, the supply of the drain to the boiler 61 is stopped. Therefore, the drain having a poor water quality is supplied to the boiler 61 and further to the equipment disposed on the downstream side of the boiler 61. Is prevented. In addition, the cleaning liquid is supplied to the tank 2. At this time, since the liquid in the tank 2 is configured to be pumped to the intermediate tank 62 by the pumping mechanism 5, the cleaning liquid is discharged from the tank 2 to the intermediate tank 62 via the pumping mechanism 5. That is, each element forming the flow path of the cleaning liquid from the tank 2 to the intermediate tank 62 is cleaned by the cleaning liquid. Thereafter, when the water quality of the drain meets the water quality standard, the control unit 7 returns the supply destination of the drain stored in the tank 2 from the intermediate tank 62 to the boiler 61. Thus, when the water quality of the drain deteriorates, the drain distribution system 100 can be restored early.

  The water quality check in steps S2 and S8 corresponds to a step of detecting the quality of the liquid. The process of setting the switching valve 51a to the first state in steps S1 and S10 corresponds to the step of setting the liquid supply destination by the pressure feeding mechanism to the first supply destination which is a normal supply destination. The process of setting the switching valve 51a in the second state in step S5 and the process of opening the third valve 41a in step S7 set the liquid supply destination by the pressure feeding mechanism to the second supply destination and supply the cleaning liquid to the tank. It corresponds to a process.

  In addition, the drain circulation system 100 includes a first valve 11 a that switches between an inflow pipe 11 (inflow part) through which the drain flowing into the tank 2 flows and an inflow destination of the drain that flows through the inflow pipe 11 between the tank 2 and the intermediate tank 62. And the second valve 12a (second switching mechanism), and the control unit 7 sets the first valve 11a and the second valve 12a when the water quality of the drain detected by the water quality sensor 3 satisfies the water quality standard. If the drain water quality detected by the water quality sensor 3 does not satisfy the water quality standard, the first valve 11a and the second valve 12a are controlled to control the drain flow. The inflow destination is set in the intermediate tank 62.

  According to this configuration, when the water quality of the drain satisfies the water quality standard, the drain collected in the tank 2 through the inflow pipe 11 is supplied to the boiler 61 by the pressure feeding mechanism 5. On the other hand, when the water quality of the drain does not meet the water quality standard, the inflow of the drain into the tank 2 through the inflow pipe 11 is stopped, and the drain that flows through the inflow pipe 11 is sent to the intermediate tank 62. The drain stored in the tank 2 at that time is supplied to the intermediate tank 62 by the pressure feeding mechanism 5. Further, the cleaning liquid is supplied to the tank 2 from the cleaning unit 4, and the cleaning liquid is also sent to the intermediate tank 62 by the pressure feeding mechanism 5. That is, the cause of the deterioration of the water quality of the drain is that impurities are mixed in the drain that flows in through the inflow pipe 11. Therefore, when the drain water quality does not satisfy the water quality standard, when draining the drain of the tank 2 to the intermediate tank 62 and supplying cleaning water to the tank 2 to clean the tank 2 and the like, a new one is introduced from the inflow pipe 11. This prevents the drain from flowing into the tank 2. As a result, the tank 2 and the like can be cleaned efficiently.

  Further, when the water quality of the drain detected by the water quality sensor 3 does not satisfy the water quality standard, the control unit 7 controls the switching valve 51 a to set the drain supply destination to the intermediate tank 62 and to drain the tank 2. Then, the cleaning unit 4 is caused to supply the cleaning liquid to the tank 2.

  According to this configuration, when the water quality of the drain does not satisfy the water quality standard and the cleaning liquid is supplied to the tank 2, the drain of the tank 2 is reduced first. When the cleaning liquid is supplied to the tank 2 in which the drain that does not satisfy the water quality standard is stored, the drain is diluted. At this time, the smaller the drain stored in the tank 2, the more diluted. That is, by reducing the drain of the tank 2 before supplying the cleaning liquid, the tank 2 and the like can be cleaned more efficiently.

  The water quality sensor 3 includes a first water quality sensor 31 that detects the water quality of the drain upstream of the switching valve 51a, and a second water quality sensor 31 that detects the water quality of the drain downstream of the switching valve 51a. The control unit 7 controls the switching valve 51a while referring to the detection result of the first water quality sensor 31 when the drain supply destination is switched from the boiler 61 to the intermediate tank 62 by controlling the switching valve 51a. When the drain supply destination is returned from the intermediate tank 62 to the boiler 61, the detection result of the second water quality sensor 32 is referred to.

  According to this configuration, when the drain water quality deteriorates and the drain supply destination is switched from the boiler 61 to the intermediate tank 62, the first water quality sensor 31 is referred to, so that the drain circulation system 100 is relatively upstream. It is possible to detect the deterioration of drain water quality. That is, the supply of drainage with poor water quality to the boiler 61 and further to the equipment on the downstream side of the boiler 61 can be stopped at an early stage. On the other hand, when the drain water quality is improved and the drain supply destination is returned from the intermediate tank 62 to the boiler 61, the drain water quality is relatively downstream in the drain circulation system 100 by referring to the second water quality sensor 32. An improvement can be detected. That is, the fact that the water quality improvement is detected by the second water quality sensor 32 means that the water quality of the drain upstream of the second water quality sensor 32 is improved. By disposing the second water quality sensor 32 on the downstream side as much as possible, the water quality improvement of most of the drain in the drain circulation system 100 can be confirmed.

  Further, the processing line 9 includes a heat exchanger 95 that performs heat exchange with a processing liquid that performs a predetermined process on the object S, and transports the target S to the processing tank 91 that stores the processing liquid and the processing tank 91. A heat transfer medium 92 that supplies the heat medium to the heat exchanger 95 and collects the heat medium from the heat exchanger 95, and a determination unit 93 that determines whether the processing tank 91 is abnormal. The medium distribution system 200 includes the drain distribution system 100 described above, and the determination unit 93 has an abnormality in the treatment tank 91 when the water quality of the drain detected by the water quality sensor 3 does not satisfy the water quality standard. Is determined.

  According to this configuration, the above-described drain distribution system 100 is incorporated in a part of the processing line 9. The drain water quality detection function in the drain distribution system 100 is used to determine an abnormality in the processing tank 91 in the processing line 9. That is, the drain distribution system 100 can contribute to the abnormality determination of the processing line 9 by detecting the water quality of the drain.

<< Other Embodiments >>
As described above, the embodiment has been described as an example of the technique disclosed in the present application. However, the technology in the present disclosure is not limited to this, and can also be applied to an embodiment in which changes, replacements, additions, omissions, and the like are appropriately performed. Moreover, it is also possible to combine each component demonstrated by the said embodiment and it can also be set as a new embodiment. In addition, among the components described in the attached drawings and detailed description, not only the components essential for solving the problem, but also the components not essential for solving the problem in order to illustrate the technology. May also be included. Therefore, it should not be immediately recognized that these non-essential components are essential as those non-essential components are described in the accompanying drawings and detailed description.

  For example, the drain distribution system 100 distributes drain, but the liquid to be distributed is not limited to drain. For example, when the heat medium flowing through the heat medium distribution system 200 is a heat medium other than steam and drain, the drain distribution system 100 distributes the heat medium.

  Further, the first supply destination of the drain in the drain distribution system 100 is not limited to the boiler 61. The first supply destination may be an apparatus using drain other than the boiler 61. The first supply destination may be a drain storage unit different from the tank 2. Further, the second supply destination is not limited to the intermediate tank 62. For example, the second supply destination may be the processing tank 63. That is, drainage with poor water quality is sent directly to the processing tank 63 without passing through the intermediate tank 62.

  The drain distribution system 100 may not be incorporated in the heat medium distribution system 200.

  Although the washing | cleaning part 4 supplies washing water, it is not restricted to this. The cleaning liquid supplied by the cleaning unit 4 is not limited to water.

  Although the water quality sensor 3 detects the water quality of the drains of the tank 2 and the intermediate tank 62, it is not necessary to detect both water qualities. That is, one of the first water quality sensor 31 and the second water quality sensor 32 may be omitted. Alternatively, the water quality sensor 3 may detect the water quality of the drain of the portion other than the tank 2 and the intermediate tank 62 (for example, the inflow pipe 11).

  For example, when the water quality sensor 3 is provided only in the tank 2, the control unit 7 improves the drain water quality even when the drain supply destination is switched from the boiler 61 to the intermediate tank 62 due to the deterioration of the drain water quality. Accordingly, when the drain supply destination is returned from the intermediate tank 62 to the boiler 61, the determination is made based on the water quality sensor 3 of the tank 2.

  The water quality sensor 3 detects the pH, conductivity, and hardness of the drain. However, the water quality sensor 3 may detect at least one of these, or may detect a physical quantity related to water quality different from these. You may do.

  Moreover, since the liquid which distribute | circulates the drain distribution system 100 is a drain, the water quality sensor 3 is employ | adopted as a detection part, However, When a liquid is not a drain, a detection part is not restricted to a water quality sensor. That is, any detection unit can be employed as long as the quality of the liquid flowing through the drain distribution system 100 can be detected.

  The inflow destination of the inflow pipe 11 is switched between the tank 2 and the intermediate tank 62, but is not limited to this. For example, when the water quality of the drained inflow is poor, the inflow of the drain may be stopped. Moreover, although the 2nd switching mechanism is formed with the 1st valve | bulb 11a and the 2nd valve | bulb 12a, it is not restricted to this. For example, the second switching mechanism may be formed by a three-way valve, and the drain inflow destination may be switched between the tank 2 and the intermediate tank 62.

  The pressure feeding mechanism 5 is not limited to an electric pump. For example, the pressure feeding mechanism 5 may be a type of pressure feeding mechanism that pumps inflowing liquid with a driving gas (for example, compressed air or steam). Specifically, this type of pumping mechanism includes a casing into which liquid flows and an air supply valve that switches inflow / stop of driving gas into the casing. The air supply valve opens when the amount of liquid stored in the casing increases and allows the driving gas to flow in. On the other hand, the air supply valve closes when the amount of liquid stored in the casing decreases and stops the flow of the driving gas. A gas pipe through which the driving gas flows is connected to such a pressure feeding mechanism, and a valve is provided in the gas pipe. By opening the valve, the driving gas flowing through the gas pipe can enter the pressure feeding mechanism, and the pressure feeding mechanism can be activated. On the other hand, by closing the valve, the driving gas flowing through the gas pipe cannot enter the pressure feeding mechanism, and the pressure feeding mechanism cannot be operated. When such a pressure feeding mechanism is employed, the process of operating the pressure feeding mechanism 5 in the above description (for example, the process of step S4) is replaced with a process of opening the valve of the gas pipe. Moreover, the process (for example, process of step S1) which stops the pumping mechanism 5 is replaced with the process which closes the valve | bulb of a gas pipe.

  The first switching mechanism is not limited to the switching valve 51a. For example, a valve may be provided in the outflow pipe 51 on the downstream side of the connection portion of the branch pipe 52, a valve may be provided in the branch pipe 52, and the first switching mechanism may be formed by these valves. That is, by switching the opening and closing of these valves, it is possible to switch whether the drain flowing through the outflow pipe 51 is supplied to the boiler 61 or the intermediate tank 62.

  Furthermore, although the various valves described above are controlled by the control unit 7, at least some of the valves may be manually operated. For example, the third valve 41a may be a manual valve. In that case, the control unit 7 may be configured to notify the operator to open the third valve 41a when the water quality of the drain does not satisfy the water quality standard. The notification timing may be when it is determined that the water quality of the drain does not satisfy the water quality standard, or may be when the water level of the tank 2 subsequently decreases as described above.

  Although the water level sensor 21 is provided in the tank 2, the water level sensor 21 may be omitted. In that case, the control unit 7 may start supplying the cleaning liquid to the tank 2 when it is determined that the water quality of the drain does not satisfy the water quality standard, or after waiting for a predetermined time after the determination, the tank 7 The supply of the cleaning liquid to 2 may be started. Alternatively, when the pressure feeding mechanism 5 is a pressure feeding mechanism using the above-described driving gas, the control unit 7 determines the operating state of the pressure feeding mechanism based on the operating state of the air supply valve, and the pressure feeding mechanism is not activated. In this case, it may be determined that the residual amount of drain in the tank 2 is small, and supply of the cleaning liquid to the tank 2 may be started.

  As described above, the technology disclosed herein is useful for a liquid distribution system, a processing line, and a liquid distribution method.

100 Drain distribution system (liquid distribution system)
200 Heat medium distribution system 11 Inflow pipe (inflow part)
11a First valve (second switching mechanism)
12a Second valve (second switching mechanism)
2 Tank 3 Water quality sensor (detection unit)
31 1st water quality sensor (1st detection part)
32 2nd water quality sensor (2nd detection part)
33 First pH sensor (detection unit, first detection unit)
34 1st conductivity sensor (detection part, 1st detection part)
35 First hardness sensor (detection unit, first detection unit)
36 Second pH sensor (detection unit, second detection unit)
37 Second conductivity sensor (detection unit, second detection unit)
38 Second hardness sensor (detection unit, second detection unit)
4 Washing unit 5 Pressure feeding mechanism 51a Switching valve (first switching mechanism)
61 Boiler (first supplier)
62 Intermediate tank (second supplier)
7 Control Unit 9 Processing Line 91 Processing Tank 92 Transport Mechanism 93 Determination Unit 95 Heat Exchanger S Object

Claims (6)

A tank for storing liquid;
A pumping mechanism for pumping the liquid in the tank;
A first switching mechanism that switches a supply destination of the liquid pumped from the pumping mechanism between a first supply destination that is a normal supply destination and a second supply destination that is different from the first supply destination;
A detection unit for detecting the quality of the liquid;
A cleaning section for supplying a cleaning liquid to the tank;
A controller that controls the first switching mechanism and the cleaning unit;
The controller is
When the quality of the liquid detected by the detection unit satisfies a predetermined quality standard, the liquid supply destination is set to the first supply destination by controlling the first switching mechanism,
When the quality of the liquid detected by the detection unit does not satisfy the quality standard, the liquid supply destination is set to the second supply destination by controlling the first switching mechanism, and the tank is provided in the cleaning unit. Liquid distribution system that supplies cleaning liquid to The liquid distribution system according to claim 1,
An inflow portion through which liquid flowing into the tank flows;
A second switching mechanism for switching an inflow destination of the liquid flowing through the inflow portion between the tank and the second supply destination;
The controller is
When the quality of the liquid detected by the detection unit satisfies the quality standard, the second switching mechanism is controlled to set the liquid inflow destination in the tank,
When the quality of the liquid detected by the detection unit does not satisfy the quality standard, the liquid distribution system controls the second switching mechanism to set the liquid inflow destination as the second supply destination. In the liquid distribution system according to claim 1 or 2,
When the quality of the liquid detected by the detection unit does not satisfy the quality standard, the control unit controls the first switching mechanism to set the liquid supply destination to the second supply destination, and A liquid distribution system that causes the cleaning unit to supply cleaning liquid to the tank after reducing the liquid in the tank. In the liquid distribution system according to any one of claims 1 to 3,
The detection unit includes a first detection unit that detects the quality of the liquid upstream of the first switching mechanism, and a second detection unit that detects the quality of the liquid downstream of the first switching mechanism. And
The control unit refers to the detection result of the first detection unit when the liquid supply destination is switched from the first supply destination to the second supply destination by controlling the first switching mechanism. A liquid distribution system that refers to the detection result of the second detection unit when the liquid supply destination is returned from the second supply destination to the first supply destination by controlling one switching mechanism. A treatment tank that performs heat exchange with a treatment liquid that performs a predetermined treatment on an object, and a treatment tank that stores the treatment liquid;
A transport mechanism for transporting an object to the treatment tank;
A heat medium distribution system for supplying a heat medium to the heat exchanger and recovering the heat medium from the heat exchanger;
A processing line including a determination unit for determining abnormality of the processing tank,
The heat medium distribution system includes the liquid distribution system according to any one of claims 1 to 4,
The determination unit is a processing line that determines that an abnormality has occurred in the processing tank when the quality of the liquid detected by the detection unit does not satisfy the quality standard. A liquid distribution method for supplying liquid stored in a tank to a predetermined supply destination by a pressure feeding mechanism,
Detecting the quality of the liquid;
When the quality of the liquid satisfies a predetermined quality standard, the step of setting the supply destination of the liquid by the pressure feeding mechanism to the first supply destination which is a normal supply destination;
When the quality of the liquid does not satisfy the quality standard, the liquid supply destination by the pressure feeding mechanism is set to a second supply destination different from the first supply destination, and the cleaning liquid is supplied to the tank; A liquid distribution method comprising:

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