Control method, device, controller and storage medium of water circulation system

Abstract

The present invention provides a control method, device, controller and storage medium of a water circulation system, which relates to the technical field of wastewater treatment. The method comprises: controlling the seventh valve to open; detecting the liquid level value and pH value of a clean water tank in real time; if the liquid level value of the clean water tank is higher than a first preset liquid level value, controlling the external circulation pump to start, the fourth valve to open and the seventh valve to close; if the pH value of the clean water tank is less than or equal to the first preset pH value, controlling the fifth valve and the sixth valve to open and the fourth valve to close; if the liquid level value of the acid tank is higher than a second preset liquid level value, controlling the fifth valve and the sixth valve to close; if the pH value of the acid tank is greater than or equal to the second preset pH value, controlling the internal circulation water pump to open. The present invention can reduce the water consumption of the equipment, save more water resources, reduce the acid generated during the operation of the equipment, reduce the cost of secondary acid treatment, prevent the water circulation system from being blocked, and keep the liquid level and pH value of the clean water tank and the acid tank stable.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater treatment, and in particular to a control method, device, controller and storage medium of a water circulation system. Background Art

[0002] like Figure 1 As shown, the waste gas treatment equipment mainly treats the waste gas generated in the semiconductor production process, mainly toxic and harmful gases, such as CF2CL2, SiO4 and other gases. After treatment, the gas will produce acid, SiO2 powder, etc.

[0003] At present, waste gas treatment equipment uses new water (tap water) to lower the internal temperature of the equipment and reduce the acid concentration generated during the operation of the equipment. This method consumes a large amount of tap water and produces a high acid concentration. Therefore, the acid needs to be treated in a secondary process, which will generate a very high cost for the secondary acid treatment. The waste gas treatment equipment needs to treat the process gas of the main equipment during operation, and the treated product contains a large amount of dust, such as SiO2. Excessive accumulation of SiO2 inside the equipment will cause the equipment to be blocked, resulting in abnormal shutdown of the equipment. Summary of the invention

[0004] The present invention provides a control method, device, controller and storage medium for a water circulation system, which are used to solve the defects of the prior art, such as large water consumption of equipment, large amount of acid liquid generated during equipment operation, easy blockage of the water circulation system and high cost of secondary treatment of acid liquid, so as to achieve the purpose of reducing the water consumption of equipment, saving more water resources, reducing the acid liquid generated during equipment operation, reducing the cost of secondary treatment of acid liquid, preventing the blockage of the water circulation system, and maintaining the liquid level and pH value of the clean water tank and the acid liquid tank stable.

[0005] In a first aspect, the present invention provides a water circulation system, comprising: a clean water tank, an acid liquid tank, an external circulation water pump, an internal circulation water pump, a first filter, a second filter, a first liquid level meter, a first PH sensor, a second liquid level meter, a second PH sensor, a first valve, a second valve, a third valve, a fourth valve, a fifth valve, a sixth valve, a seventh valve and a controller;

[0006] The acid liquid pool is provided with the first liquid level meter and the first PH sensor, the water inlet pipe of which is respectively connected to the rear end of the first filter and the rear end of the second filter, and is provided with the fifth valve, the alkali liquid input pipe of which is provided with the sixth valve, and the water outlet pipe of which is connected to the water inlet of the internal circulation water pump;

[0007] The water purification tank is provided with the second liquid level meter and the second PH sensor, the first water inlet pipe is provided with the seventh valve, the second water inlet pipe is connected to the water outlet of the internal circulation water pump, the third water inlet pipe is connected to the rear end of the first filter and the rear end of the second filter respectively, the third water inlet pipe is provided with the fourth valve, the water outlet pipe is connected to the water inlet of the external circulation water pump, and the fourth water inlet pipe is used to transport wastewater;

[0008] The front end of the first filter and the front end of the second filter are connected to the water outlet of the external circulation water pump through the first valve and the second valve respectively, and the outlets of the first filter and the second filter are connected to the drainage pipe, and the third valve is provided on the drainage pipe;

[0009] The controller is used to control the external circulation water pump, the internal circulation water pump and various valves based on the data collected by the first liquid level meter, the first pH sensor, the second liquid level meter and the second pH sensor, so as to maintain the liquid level and pH value of the clean water tank and the acid liquid tank stable and prevent the water circulation system from being blocked.

[0010] According to a water circulation system provided by the present invention, the water circulation system also includes: a first temperature sensor, a second temperature sensor and an alarm, the first temperature sensor is arranged in the clean water pool, and the second temperature sensor is arranged in the acid liquid pool, and the controller is also used to control the alarm to sound an alarm when the collected temperature of the first temperature sensor and / or the second temperature sensor is higher than a first preset temperature, and control the water circulation system to stop working when the collected temperature of the first temperature sensor and / or the second temperature sensor is higher than a second preset temperature.

[0011] In a second aspect, the present invention further provides a method for controlling a water circulation system as provided in any of the above embodiments, comprising:

[0012] Controlling the seventh valve to open;

[0013] Real-time detection of the liquid level and pH value of the water purification pool;

[0014] If the liquid level value of the clean water tank is higher than the first preset liquid level value, the external circulation pump is controlled to start, the fourth valve is opened, and the seventh valve is closed;

[0015] If the pH value of the water purification pool is less than or equal to the first preset pH value, the fifth valve and the sixth valve are controlled to be opened and the fourth valve is controlled to be closed;

[0016] If the liquid level of the acid liquid pool is higher than a second preset liquid level, the fifth valve and the sixth valve are controlled to be closed;

[0017] If the pH value of the acid pool is greater than or equal to a second preset pH value, the internal circulation water pump is controlled to start.

[0018] According to a control method for a water circulation system provided by the present invention, the opening values ​​of the fifth valve and the sixth valve are adjusted by the following steps:

[0019] When the pH value of the clean water tank is less than or equal to the first preset pH value, the opening values ​​of the fifth valve and the sixth valve are adjusted by a position PID adjustment method based on the pH value of the acid liquid tank;

[0020] When the pH value of the clean water tank is greater than the first preset pH value and less than or equal to the second preset pH value, the opening value of the fifth valve is adjusted by the incremental PID adjustment method, and the opening value of the sixth valve is adjusted by the reverse linear incremental adjustment method.

[0021] According to a control method for a water circulation system provided by the present invention, the opening values ​​of the fifth valve and the sixth valve are adjusted by a position PID adjustment method based on the pH value of the acid pool, comprising:

[0022] When the pH value of the acid pool is greater than or equal to the second preset pH value, the position PID adjustment method is used to increase the opening value of the fifth valve and decrease the opening value of the sixth valve;

[0023] When the pH value of the acid pool is lower than the second preset pH value, the position PID adjustment method is used to reduce the opening value of the fifth valve and increase the opening value of the sixth valve.

[0024] According to a control method for a water circulation system provided by the present invention, the incremental PID adjustment method is used to adjust the opening value of the fifth valve, comprising:

[0025] At the moment when the pH value of the clean water tank is greater than the first preset pH value, determining the current PID value of the fifth valve;

[0026] In each cycle, the fifth valve is actuated according to the action increment of the current cycle, and the next PID value is outputted until the opening value of the fifth valve reaches the maximum;

[0027] Among them, the next PID value is the sum of the current PID value and the action increment of the current cycle, the action increment of the current cycle is the product of the current PID value and the target ratio, and the target ratio is the ratio between the difference between the pH value of the acid pool and the pH value of the clean water pool and the pH value of the acid pool.

[0028] According to a control method for a water circulation system provided by the present invention, the reverse linear incremental adjustment method is used to adjust the opening value of the sixth valve, including:

[0029] When the pH value of the water purification pool is within the preset pH value range, the sixth valve is operated according to the corresponding incremental opening value to obtain the output opening value of the sixth valve; the output opening value is the difference between the current output opening value of the sixth valve and the incremental opening value, the incremental opening value is the product of the current output opening value and the variable opening value, and the variable proportional coefficient is the ratio of the current PID proportional coefficient to the variable value;

[0030] The overall pH value range of the clean water tank is divided into a plurality of preset pH value ranges, and the overall opening value of the sixth valve is divided into a plurality of preset opening value ranges; for each preset pH value range, the variable opening value is the ratio of the product of the length of the preset opening value range and the pH value of the clean water tank to the length of the preset pH value range.

[0031] In a third aspect, the present invention further provides a control device for a water circulation system as provided in any of the above embodiments, comprising:

[0032] A first control module, used for controlling the seventh valve to open;

[0033] A real-time monitoring module, used for real-time detection of the liquid level and pH value of the water purification tank;

[0034] A second control module, used for controlling the start of the external circulation pump, the opening of the fourth valve and the closing of the seventh valve when the liquid level value of the clean water tank is higher than a first preset liquid level value;

[0035] A third control module, configured to control the fifth valve and the sixth valve to open and the fourth valve to close when the pH value of the water purification pool is less than or equal to a first preset pH value;

[0036] a fourth control module, configured to control the fifth valve and the sixth valve to close when the liquid level of the acid liquid pool is higher than a second preset liquid level;

[0037] The fifth control module is used to control the internal circulation water pump to start when the pH value of the acid pool is greater than or equal to a second preset pH value.

[0038] In a fourth aspect, the present invention further provides a controller comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of the method for controlling a water circulation system as described in any one of the above are implemented.

[0039] In a fifth aspect, the present invention further provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of a method for controlling a water circulation system as described in any one of the above.

[0040] The control method, device, controller and storage medium of the water circulation system provided by the present invention, firstly, the alkali liquid input pipeline can transport the alkali liquid to the acid liquid pool, and react with the acid liquid in the acid liquid pool, and the neutralized liquid can replace the tap water to enter the clean water pool, thereby reducing the water consumption of the equipment and saving more water resources; secondly, since the waste water in the clean water pool can enter the acid liquid pool through the external circulation and react with the alkali liquid, the acid liquid generated during the operation of the equipment can be reduced, and the cost of secondary treatment of the acid liquid can be reduced; thirdly, since the filter can filter the dust and discharge it through the drainage pipe, the water circulation system can be prevented from being blocked; fourthly, the liquid level and pH value of the clean water pool and the acid liquid pool can be kept stable by controlling the external circulation water pump, the internal circulation water pump and each valve through the controller. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0042] Figure 1 It is a schematic diagram of an exhaust gas treatment device provided by the prior art;

[0043] Figure 2 is a schematic structural diagram of a water circulation system provided by an embodiment of the present invention;

[0044] Figure 3 is a flow chart of a control method for a water circulation system provided by an embodiment of the present invention;

[0045] Figure 4 is a schematic diagram of the structure of a control device for a water circulation system provided by an embodiment of the present invention;

[0046] Figure 5 It is a structural schematic diagram of the controller provided by the present invention. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] Combine the following Figure 2 and Figure 3 The water circulation system and the control method of the water circulation system of the present invention are described.

[0049] Please refer to Figure 2 , Figure 2 Schematic diagram of the structure of the water circulation system provided by the embodiment of the present invention. Figure 2 As shown, the water circulation system may include: an acid tank 1, a clean water tank 2, an external circulation water pump 3, an internal circulation water pump 4, a first filter 5, a second filter 6, a first liquid level meter 7, a first PH sensor 8, a second liquid level meter 9, a second PH sensor 10, a first valve 11, a second valve 12, a third valve 13, a fourth valve 14, a fifth valve 15, a sixth valve 16, a seventh valve 17 and a controller ( Figure 2 not shown).

[0050] The acid liquid pool 1 is provided with a first liquid level meter 7 and a first pH sensor 8, wherein a water inlet pipe 18 is respectively connected to the rear ends of the first filter 5 and the second filter 6, and is provided with a fifth valve 15, an alkali liquid input pipe 19 is provided with a sixth valve 16, and a water outlet pipe 20 is connected to the water inlet of the internal circulation water pump 4.

[0051] The water purification pool 2 is provided with a second liquid level meter 9 and a second PH sensor 10, a first water inlet pipe 21 is provided with a seventh valve 17, a second water inlet pipe 22 is connected to the water outlet of the internal circulation water pump 4, a third water inlet pipe 23 is respectively connected to the rear end of the first filter 5 and the rear end of the second filter 6, a third water inlet pipe 23 is provided with a fourth valve 14, a water outlet pipe 24 is connected to the water inlet of the external circulation water pump 3, and a fourth water inlet pipe 25 is used to transport waste water.

[0052] The front end of the first filter 5 and the front end of the second filter 6 are connected to the water outlet of the external circulation water pump 3 through the first valve 11 and the second valve 12 respectively, and the outlets of the first filter 5 and the second filter 6 are connected to the drainage pipe 26, and the third valve 13 is arranged on the drainage pipe 26.

[0053] The controller is used to control the external circulation water pump 3, the internal circulation water pump 4 and each valve based on the data collected by the first liquid level meter 7, the first pH sensor 8, the second liquid level meter 9 and the second pH sensor 10, so as to maintain the liquid level and pH value of the clean water tank 2 and the acid tank 1 stable, and prevent the water circulation system from being blocked.

[0054] The working principle of the water circulation system is introduced below.

[0055] The water purification tank 2 is supplied with wastewater through the fourth water inlet pipe 25, including acid solution, SiO2 powder, etc., and tap water is supplied through the first water inlet pipe 21. The second liquid level meter 9 is used to measure the liquid level value of the water purification tank 2, and the second pH sensor 10 is used to measure the pH value of the water purification tank 2.

[0056] The acid liquid pool 1 transports alkali liquid through the alkali liquid input pipeline 19, the first liquid level meter 7 is used to measure the liquid level value of the acid liquid pool 1, and the first pH sensor 8 is used to measure the pH value of the acid liquid pool 1.

[0057] The external circulation water pump 3 circulates the liquid in the clean water tank 2 when the fourth valve 14 is open and the fifth valve 15 is closed. That is, the liquid flows into the external circulation water pump 3 from the outlet pipe 24 and returns to the clean water tank 2 through the third inlet pipe 23. When the fourth valve 14 is closed and the fifth valve 15 is open, the liquid in the clean water tank 2 is introduced into the acid liquid tank 1 through the external circulation water pump 3. That is, the liquid flows into the external circulation water pump 3 from the outlet pipe 24 and flows into the acid liquid tank 1 through the inlet pipe 18.

[0058] The internal circulation water pump 4 guides the neutralized water in the acid pool 1 into the clean water pool 2.

[0059] The first filter 5 is the main filter, and the second filter 6 is the slave filter. When the first valve 11 is opened, the first filter 5 works to filter the powder in the external circulation process. When the first filter 5 fails, the first valve 11 can be closed, the second valve 12 can be opened, and the second filter 6 can be switched to work. The filter can be replaced and cleaned online, which can extend the equipment operation cycle and facilitate equipment maintenance.

[0060] The third valve 13 can be opened once at a preset time interval to discharge the accumulated powder, thereby realizing a self-cleaning function.

[0061] The water circulation system provided in this embodiment has the following advantages: first, the alkali liquid input pipeline can transport the alkali liquid to the acid liquid tank, and react with the acid in the acid liquid tank to undergo neutralization reaction. The neutralized liquid can replace tap water to enter the clean water tank, thereby reducing the water consumption of the equipment and saving more water resources; second, since the waste water in the clean water tank can enter the acid liquid tank through external circulation and react with the alkali liquid to undergo neutralization reaction, the acid generated during the operation of the equipment can be reduced, and the cost of secondary treatment of the acid liquid can be reduced; third, since the filter can filter the dust and discharge it through the drainage pipe, the water circulation system can be prevented from being blocked; fourth, the liquid level and pH value of the clean water tank and the acid liquid tank can be kept stable by controlling the external circulation water pump, the internal circulation water pump and various valves through the controller.

[0062] In one embodiment, the water circulation system further includes: a first temperature sensor T1, a second temperature sensor T2 and an alarm ( Figure 2 (not shown), the first temperature sensor T1 is arranged in the water purification pool 2, and the second temperature sensor T2 is arranged in the acid liquid pool 1. The controller is also used to control the alarm to alarm when the collected temperature of the first temperature sensor T1 and / or the second temperature sensor T2 is higher than the first preset temperature, and control the water circulation system to stop working when the collected temperature of the first temperature sensor T1 and / or the second temperature sensor T2 is higher than the second preset temperature.

[0063] Specifically, the first temperature sensor T1 is used to measure the temperature of the liquid in the purified water pool 2, and the second temperature sensor T2 is used to measure the temperature of the liquid in the acid pool 1.

[0064] The first preset temperature may be 55° C., and the second preset temperature may be 65° C., but the embodiment is not limited thereto.

[0065] Since the acid-base neutralization will generate a lot of heat, when the temperature collected by the first temperature sensor T1 and / or the second temperature sensor T2 is higher than 55°C, the controller controls the alarm to sound an alarm. When the temperature collected by the first temperature sensor T1 and / or the second temperature sensor T2 is higher than 65°C, the controller controls the water circulation system to stop working, that is, the outer circulation water pump 3, the inner circulation water pump 4 and all valves in the water circulation system stop working.

[0066] In this embodiment, when the temperature of the water circulation system reaches the first preset temperature, the staff can be promptly reminded to take measures, and when the temperature of the water circulation system reaches the second preset temperature, the water circulation system can be promptly controlled to stop working to avoid safety hazards.

[0067] After introducing the water circulation system, the control method of any of the above-mentioned water circulation systems will be introduced in detail below.

[0068] Please refer to Figure 3 , Figure 3 FIG. 1 is a flow chart of a control method for a water circulation system provided by an embodiment of the present invention. Figure 3 As shown, the method may include the following steps:

[0069] Step 301, control the seventh valve to open;

[0070] Step 302: Real-time detection of the liquid level and pH value of the water purification pool;

[0071] Step 303, determine whether the liquid level value of the water purification tank is higher than the first preset liquid level value, if so, proceed to step 304, if not, proceed to step 301;

[0072] Step 304, controlling the external circulation pump to start, the fourth valve to open, and the seventh valve to close;

[0073] Step 305, determining whether the pH value of the water purification pool is less than or equal to the first preset pH value, if so, proceeding to step 306, if not, proceeding to step 304;

[0074] Step 306, control the fifth valve and the sixth valve to open and the fourth valve to close, and then proceed to step 303 and step 307;

[0075] Step 307, determining whether the liquid level of the acid liquid pool is higher than the second preset liquid level value, if so, proceeding to step 308, if not, proceeding to step 306;

[0076] Step 308, controlling the fifth valve and the sixth valve to close;

[0077] Step 309, determining whether the pH value of the acid pool is greater than or equal to a second preset pH value, if so, proceeding to step 310;

[0078] Step 310 , control the internal circulation water pump to start, and go to step 307 .

[0079] In step 301 , the seventh valve 17 is controlled to open, so that tap water can be delivered from the first water inlet pipe 21 .

[0080] In step 302, the liquid level value measured by the second liquid level meter 9 and the pH value measured by the second pH sensor 10 in the water purification tank 2 are detected in real time.

[0081] In step 303 and step 304, the liquid level value of the clean water tank 2 is higher than the first preset liquid level value, which means that the liquid level value of the clean water tank 2 is too high. If the liquid level value of the clean water tank 2 is too high, the external circulation water pump 3 is controlled to start, the fourth valve 14 is opened, and the seventh valve 17 is closed. That is, the tap water is stopped from being delivered, and the external circulation water pump 3 is turned on, and the fourth valve 14 is opened, so that the water in the clean water tank 2 circulates.

[0082] If the liquid level value of the clean water tank 2 is low, the seventh valve 17 continues to be opened to continue to supply tap water to the clean water tank 2.

[0083] In step 305 and step 306, the pH value of the clean water tank 2 is less than or equal to the first preset pH value, and the first preset pH value may be 2, which means that the liquid in the clean water tank 2 is acidic. If the liquid in the clean water tank 2 is acidic, the fifth valve 15 and the sixth valve 16 are controlled to be opened and the fourth valve 14 is closed. That is, the liquid in the clean water tank 2 is introduced into the acid tank 1 through the external circulation water pump 3, and the alkali is transported to the acid tank 1 through the alkali input pipeline 19, so that the acid and the alkali are neutralized in the acid tank 1.

[0084] In step 307 and step 308, the liquid level value of the acid tank 1 is higher than the second preset liquid level value, which means that the liquid level value of the acid tank 1 is too high. If the liquid level value of the acid tank 1 is too high, the fifth valve 15 and the sixth valve 16 are controlled to be closed. That is, the acid and alkali solution are stopped from being transported into the acid tank 1.

[0085] In step 309 and step 310, the pH value of the acid pool 1 is greater than or equal to the second preset pH value, and the second preset pH value may be 6, which means that the pH value of the acid pool 1 is alkaline. If the pH value of the acid pool 1 is alkaline, the internal circulation water pump 4 may be turned on to transport the neutralized water to the clean water pool 2 to replace the tap water, thereby reducing the water consumption of the equipment and saving more water resources.

[0086] If the liquid level of the acid pool 1 is too low due to the internal circulation, the internal circulation water pump 4 is turned off and the acid and alkali solutions are continuously introduced.

[0087] In this embodiment, on the first hand, by controlling the fifth valve and the sixth valve to open and the fourth valve to close, the acid and alkali can be neutralized in the acid tank, and the neutralized liquid can replace the tap water to enter the clean water tank, thereby reducing the water consumption of the equipment and saving more water resources; on the second hand, by controlling the start of the external circulation pump, the opening of the fourth valve and the closing of the seventh valve, the wastewater in the clean water tank can enter the acid tank through the external circulation and react with the alkali to reduce the acid generated during the operation of the equipment and reduce the cost of secondary acid treatment; on the third hand, the liquid level and pH value of the clean water tank and the acid tank can be kept stable by controlling the external circulation water pump, the internal circulation water pump and each valve through the controller.

[0088] In one embodiment, the opening values ​​of the fifth valve and the sixth valve are adjusted by the following steps:

[0089] Step 3061: When the pH value of the clean water tank is less than or equal to the first preset pH value, the opening values ​​of the fifth valve and the sixth valve are adjusted by using a position PID adjustment method based on the pH value of the acid liquid tank;

[0090] Step 3062: When the pH value of the clean water tank is greater than the first preset pH value and less than or equal to the second preset pH value, the opening value of the fifth valve is adjusted by the incremental PID adjustment method, and the opening value of the sixth valve is adjusted by the reverse linear incremental adjustment method.

[0091] In step 3061, the pH value of the clean water tank 2 is less than or equal to the first preset pH value, and the first preset pH value may be 2, which means that the liquid in the clean water tank 2 is acidic. If the liquid in the clean water tank 2 is acidic, based on the pH value of the acid liquid tank 1, the position PID adjustment method is used to adjust the opening values ​​of the fifth valve 15 and the sixth valve 16 to adjust the acid and alkali inflow amounts, thereby maintaining the pH value in the acid liquid tank 1 stable.

[0092] In step 3062, the pH value of the clean water tank 2 is greater than the first preset pH value and less than or equal to the second preset pH value. The first preset pH value can be 2, and the second preset pH value can be 6, which means that the liquid in the clean water tank 2 is neither acidic nor alkaline, but contains acidity and alkalinity. Therefore, it is necessary to use the incremental PID adjustment method to adjust the opening value of the fifth valve 15, and use the reverse linear incremental adjustment method to adjust the opening value of the sixth valve 16, so as to achieve fast and accurate neutralization.

[0093] In this embodiment, rapid and accurate neutralization can be achieved by adjusting the opening values ​​of the fifth valve and the sixth valve.

[0094] In one embodiment, step 3061 may include: when the pH value of the acid liquid pool 1 is greater than or equal to the second preset pH value, the position PID regulation method is used to increase the opening value of the fifth valve 15 and decrease the opening value of the sixth valve 16; when the pH value of the acid liquid pool 1 is lower than the second preset pH value, the position PID regulation method is used to decrease the opening value of the fifth valve 15 and increase the opening value of the sixth valve 16.

[0095] Assume that the first preset PH value is represented by X1, the second preset PH value is represented by X2, the PH value of the acid pool 1 is represented by PH1, and the PH value of the clean water pool 2 is represented by PH2. When PH2<=X1, the fifth valve 15 and the sixth valve 16 use the position PID to adjust the opening value according to PH1. When PH1≥X2, the position PID adjustment method is used to increase the opening value of the fifth valve 15 and decrease the opening value of the sixth valve 16. When PH1<=X2, the position PID adjustment method is used to decrease the opening value of the fifth valve 15 and increase the opening value of the sixth valve 16.

[0096] In this embodiment, the opening values ​​of the fifth valve and the sixth valve may be adjusted based on the pH value of the acid pool by using a position PID adjustment method.

[0097] In one embodiment, in step 3062, the opening value of the fifth valve is adjusted using an incremental PID adjustment method, including:

[0098] At the moment when the pH value of the clean water tank 2 is greater than the first preset pH value, the current PID value of the fifth valve 15 is determined;

[0099] In each cycle, the fifth valve 15 is actuated according to the action increment of the current cycle, and the next PID value is outputted until the opening value of the fifth valve 15 reaches the maximum;

[0100] Among them, the next PID value is the sum of the current PID value and the action increment of the current cycle, the action increment of the current cycle is the product of the current PID value and the target ratio, and the target ratio is the ratio between the difference between the pH value of the acid pool 1 and the pH value of the clean water pool 2 and the pH value of the acid pool 1.

[0101] Specifically, the PID calculation formula is as follows:

[0102] Y=A1*e(K)+B1*e(K-1)+C1*e(K-2)

[0103]

[0104] Among them, Y represents PID calculation, A1 represents proportional calculation, B1 represents integral calculation, C1 represents differential calculation, Kp represents proportional coefficient, Ti represents integral time constant, Td represents differential time constant, and Tc represents adjustment period.

[0105] At the moment when PH2>X1, the current PID value of the fifth valve 15 is assigned to Y51, and the fifth valve 15 does not continue to perform PID calculation. In each cycle, the fifth valve 15 is operated according to the action increment Y52 of the current cycle, and the next PID value Y53 is output until the opening value of the fifth valve 15 reaches the maximum. Among them, Y53=Y51+Y52, Y52=Y51*Z1, Z1=(PH1-PH2) / PH1.

[0106] The corresponding calculation formula is:

[0107] In this embodiment, the incremental PID adjustment method can be used to adjust the opening value of the fifth valve, thereby adjusting the amount of acid inlet, so that the pH value in the acid liquid pool is more stable.

[0108] In one embodiment, in step 3062, the opening value of the sixth valve 16 is adjusted by using a reverse linear incremental adjustment method, including:

[0109] When the pH value of the water purification tank 2 is within the preset pH value range, the sixth valve 16 operates according to the corresponding incremental opening value to obtain the output opening value of the sixth valve 16; the output opening value is the difference between the current output opening value and the incremental opening value of the sixth valve 16, the incremental opening value is the product between the current output opening value and the variable opening value, and the variable proportional coefficient is the ratio of the current PID proportional coefficient to the variable value;

[0110] The overall pH value range of the water purification tank 2 is divided into multiple preset pH value ranges, and the overall opening value of the sixth valve 16 is divided into multiple preset opening value ranges; for each preset pH value range, the variable opening value is the ratio of the product of the length of the preset opening value range and the pH value of the water purification tank 2 to the length of the preset pH value range.

[0111] Exemplarily, the overall pH value range [X1, X2] of the water purification tank 2 can be divided into 6 preset pH value ranges, namely [X1, a1], (a1, a2], (a2, a3], (a3, a4], (a4, a5] and (a5, X2]. The overall opening value of the sixth valve 16 is divided into 6 preset opening value ranges, namely [B1, b1], (b1, b2], (b2, b3], (b3, b4], (b4, b5] and (b5, B2]. The 6 variable values include: C1, C2, C3, C4, C5, C6. The current output opening value of the sixth valve 16 is represented by Y61, the incremental opening value is represented by Y62, the output opening value of the sixth valve 16 is represented by Y63, and the variable opening value is represented by b.

[0112] When PH2 <= a1, b = b1, Kp = Kp / C1, Y62 = Y61 * b1, Y63 = Y61 - Y62;

[0113] When a1 < PH2 <= a2, b = (b1 - b2) * PH2 / (a2 - a1), Kp = Kp / C2, Y62 = Y62 + b, Y63 = Y61 - Y62;

[0114] And so on;

[0115] When a4 < PH2 <= a5, b = (b4 - b5) * PH2 / (a5 - a4), Kp = Kp / C5, Y62 = Y62 + b, Y63 = Y61 - Y62;

[0116] When PH2 > a5, b = b5, Kp = Kp / C6, Y62 = Y62 + b, Y62 = Y61 * b5.

[0117] The corresponding calculation formula is:

[0118] In this embodiment, the reverse linear incremental adjustment method is used to adjust the opening value of the sixth valve, thereby adjusting the amount of alkali inflow to make the pH value in the acid solution pool more stable.

[0119] The control device of the water circulation system provided by the present invention is described below. The control device of the water circulation system described below and the control method of the water circulation system described above can be referred to each other.

[0120] Please refer to Figure 4 , Figure 4 Schematic diagram of the structure of the control device of the water circulation system provided by the embodiment of the present invention. Figure 4 As shown, the device may include:

[0121] A first control module 401, used for controlling the seventh valve to open;

[0122] A real-time monitoring module 402 is used to detect the liquid level and pH value of the water purification tank in real time;

[0123] A second control module 403 is used to control the external circulation pump to start, the fourth valve to open, and the seventh valve to close when the liquid level value of the clean water tank is higher than a first preset liquid level value;

[0124] A third control module 404, configured to control the fifth valve and the sixth valve to open and the fourth valve to close when the pH value of the water purification pool is less than or equal to a first preset pH value;

[0125] The fourth control module 405 is used to control the fifth valve and the sixth valve to close when the liquid level value of the acid liquid pool is higher than the second preset liquid level value;

[0126] The fifth control module 406 is used to control the internal circulation water pump to start when the pH value of the acid pool is greater than or equal to a second preset pH value.

[0127] Optionally, the third control module 404 is specifically configured to adjust the opening values ​​of the fifth valve and the sixth valve in the following manner:

[0128] When the pH value of the clean water tank is less than or equal to the first preset pH value, the opening values ​​of the fifth valve and the sixth valve are adjusted by a position PID adjustment method based on the pH value of the acid liquid tank;

[0129] When the pH value of the clean water tank is greater than the first preset pH value and less than or equal to the second preset pH value, the opening value of the fifth valve is adjusted by the incremental PID adjustment method, and the opening value of the sixth valve is adjusted by the reverse linear incremental adjustment method.

[0130] Optionally, the third control module 404 is specifically configured to:

[0131] When the pH value of the acid pool is greater than or equal to the second preset pH value, the position PID adjustment method is used to increase the opening value of the fifth valve and decrease the opening value of the sixth valve;

[0132] When the pH value of the acid pool is lower than the second preset pH value, the position PID adjustment method is used to reduce the opening value of the fifth valve and increase the opening value of the sixth valve.

[0133] Optionally, the third control module 404 is specifically configured to:

[0134] At the moment when the pH value of the clean water tank is greater than the first preset pH value, determining the current PID value of the fifth valve;

[0135] In each cycle, the fifth valve is actuated according to the action increment of the current cycle, and the next PID value is outputted until the opening value of the fifth valve reaches the maximum;

[0136] Among them, the next PID value is the sum of the current PID value and the action increment of the current cycle, the action increment of the current cycle is the product of the current PID value and the target ratio, and the target ratio is the ratio between the difference between the pH value of the acid pool and the pH value of the clean water pool and the pH value of the acid pool.

[0137] Optionally, the third control module 404 is specifically configured to:

[0138] When the pH value of the water purification pool is within the preset pH value range, the sixth valve is operated according to the corresponding incremental opening value to obtain the output opening value of the sixth valve; the output opening value is the difference between the current output opening value of the sixth valve and the incremental opening value, the incremental opening value is the product of the current output opening value and the variable opening value, and the variable proportional coefficient is the ratio of the current PID proportional coefficient to the variable value;

[0139] The overall pH value range of the clean water tank is divided into a plurality of preset pH value ranges, and the overall opening value of the sixth valve is divided into a plurality of preset opening value ranges; for each preset pH value range, the variable opening value is the ratio of the product of the length of the preset opening value range and the pH value of the clean water tank to the length of the preset pH value range.

[0140] Figure 5 An example of a physical structure diagram of a controller is shown below: Figure 5As shown, the controller may include: a processor 810, a communication interface 820, a memory 830, and a communication bus 840, wherein the processor 810, the communication interface 820, and the memory 830 communicate with each other through the communication bus 840. The processor 810 may call the logic instructions in the memory 830 to execute the steps of any of the above method embodiments, which will not be repeated here.

[0141] In addition, the logic instructions in the above-mentioned memory 830 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0142] On the other hand, the present invention also provides a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium, and the computer program includes program instructions. When the program instructions are executed by a computer, the computer can perform the steps of any of the above-mentioned method embodiments, which will not be repeated here.

[0143] On the other hand, the present invention further provides a non-transitory computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of any of the above method embodiments are implemented, which will not be described in detail here.

[0144] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0145] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0146] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for controlling a water circulation system, characterized in that: The water circulation system comprises: a clean water tank, an acid tank, an external circulation water pump, an internal circulation water pump, a first filter, a second filter, a first liquid level meter, a first PH sensor, a second liquid level meter, a second PH sensor, a first valve, a second valve, a third valve, a fourth valve, a fifth valve, a sixth valve, a seventh valve and a controller; The acid liquid pool is provided with the first liquid level meter and the first PH sensor, the water inlet pipe of which is respectively connected to the rear end of the first filter and the rear end of the second filter, and is provided with the fifth valve, the alkali liquid input pipe of which is provided with the sixth valve, and the water outlet pipe of which is connected to the water inlet of the internal circulation water pump; The water purification tank is provided with the second liquid level meter and the second PH sensor, the first water inlet pipe is provided with the seventh valve, the second water inlet pipe is connected to the water outlet of the internal circulation water pump, the third water inlet pipe is connected to the rear end of the first filter and the rear end of the second filter respectively, the third water inlet pipe is provided with the fourth valve, the water outlet pipe is connected to the water inlet of the external circulation water pump, and the fourth water inlet pipe is used to transport wastewater; The front end of the first filter and the front end of the second filter are connected to the water outlet of the external circulation water pump through the first valve and the second valve respectively, and the outlets of the first filter and the second filter are connected to the drainage pipe, and the third valve is provided on the drainage pipe; The controller is used to control the external circulation water pump, the internal circulation water pump and each valve based on the data collected by the first liquid level meter, the first pH sensor, the second liquid level meter and the second pH sensor, so as to keep the liquid level and pH value of the clean water tank and the acid liquid tank stable and prevent the water circulation system from being blocked; The control method of the water circulation system comprises: Controlling the seventh valve to open; Real-time detection of the liquid level and pH value of the water purification pool; If the liquid level value of the clean water tank is higher than the first preset liquid level value, the external circulation pump is controlled to start, the fourth valve is opened, and the seventh valve is closed; If the pH value of the water purification pool is less than or equal to the first preset pH value, the fifth valve and the sixth valve are controlled to be opened and the fourth valve is controlled to be closed; If the liquid level of the acid liquid pool is higher than a second preset liquid level, the fifth valve and the sixth valve are controlled to be closed; If the pH value of the acid pool is greater than or equal to a second preset pH value, the internal circulation water pump is controlled to start.

2. The control method of the water circulation system according to claim 1, characterized in that: The opening values ​​of the fifth valve and the sixth valve are adjusted by the following steps: When the pH value of the clean water tank is less than or equal to the first preset pH value, the opening values ​​of the fifth valve and the sixth valve are adjusted by a position PID adjustment method based on the pH value of the acid liquid tank; When the pH value of the clean water tank is greater than the first preset pH value and less than or equal to the second preset pH value, the opening value of the fifth valve is adjusted by the incremental PID adjustment method, and the opening value of the sixth valve is adjusted by the reverse linear incremental adjustment method.

3. The control method of the water circulation system according to claim 2, characterized in that: The method of adjusting the opening values ​​of the fifth valve and the sixth valve by using a position PID adjustment method based on the pH value of the acid pool includes: When the pH value of the acid pool is greater than or equal to the second preset pH value, the position PID adjustment method is used to increase the opening value of the fifth valve and decrease the opening value of the sixth valve; When the pH value of the acid pool is lower than the second preset pH value, the position PID adjustment method is used to reduce the opening value of the fifth valve and increase the opening value of the sixth valve.

4. The control method of the water circulation system according to claim 2, characterized in that: The incremental PID adjustment method is used to adjust the opening value of the fifth valve, including: At the moment when the pH value of the clean water tank is greater than the first preset pH value, determining the current PID value of the fifth valve; In each cycle, the fifth valve is actuated according to the action increment of the current cycle, and the next PID value is outputted until the opening value of the fifth valve reaches the maximum; Among them, the next PID value is the sum of the current PID value and the action increment of the current cycle, the action increment of the current cycle is the product of the current PID value and the target ratio, and the target ratio is the ratio between the difference between the pH value of the acid pool and the pH value of the clean water pool and the pH value of the acid pool.

5. The control method of the water circulation system according to claim 2, characterized in that: The method of adjusting the opening value of the sixth valve by using a reverse linear incremental adjustment method includes: When the pH value of the water purification pool is within the preset pH value range, the sixth valve is operated according to the corresponding incremental opening value to obtain the output opening value of the sixth valve; the output opening value is the difference between the current output opening value of the sixth valve and the incremental opening value, the incremental opening value is the product of the current output opening value and the variable opening value, and the variable proportional coefficient is the ratio of the current PID proportional coefficient to the variable value; The overall pH value range of the clean water tank is divided into a plurality of preset pH value ranges, and the overall opening value of the sixth valve is divided into a plurality of preset opening value ranges; for each preset pH value range, the variable opening value is the ratio of the product of the length of the preset opening value range and the pH value of the clean water tank to the length of the preset pH value range.

6. A control device for a water circulation system, characterized in that: The water circulation system comprises: a clean water tank, an acid tank, an external circulation water pump, an internal circulation water pump, a first filter, a second filter, a first liquid level meter, a first PH sensor, a second liquid level meter, a second PH sensor, a first valve, a second valve, a third valve, a fourth valve, a fifth valve, a sixth valve, a seventh valve and a controller; The acid liquid pool is provided with the first liquid level meter and the first PH sensor, the water inlet pipe of which is respectively connected to the rear end of the first filter and the rear end of the second filter, and is provided with the fifth valve, the alkali liquid input pipe of which is provided with the sixth valve, and the water outlet pipe of which is connected to the water inlet of the internal circulation water pump; The water purification tank is provided with the second liquid level meter and the second PH sensor, the first water inlet pipe is provided with the seventh valve, the second water inlet pipe is connected to the water outlet of the internal circulation water pump, the third water inlet pipe is connected to the rear end of the first filter and the rear end of the second filter respectively, the third water inlet pipe is provided with the fourth valve, the water outlet pipe is connected to the water inlet of the external circulation water pump, and the fourth water inlet pipe is used to transport wastewater; The front end of the first filter and the front end of the second filter are connected to the water outlet of the external circulation water pump through the first valve and the second valve respectively, and the outlets of the first filter and the second filter are connected to the drainage pipe, and the third valve is provided on the drainage pipe; The controller is used to control the external circulation water pump, the internal circulation water pump and each valve based on the data collected by the first liquid level meter, the first pH sensor, the second liquid level meter and the second pH sensor, so as to keep the liquid level and pH value of the clean water tank and the acid liquid tank stable and prevent the water circulation system from being blocked; The control device of the water circulation system comprises: A first control module, used for controlling the seventh valve to open; A real-time monitoring module, used for real-time detection of the liquid level and pH value of the water purification tank; A second control module, used for controlling the start of the external circulation pump, the opening of the fourth valve and the closing of the seventh valve when the liquid level value of the clean water tank is higher than a first preset liquid level value; A third control module, configured to control the fifth valve and the sixth valve to open and the fourth valve to close when the pH value of the water purification pool is less than or equal to a first preset pH value; a fourth control module, configured to control the fifth valve and the sixth valve to close when the liquid level of the acid liquid pool is higher than a second preset liquid level; The fifth control module is used to control the internal circulation water pump to start when the pH value of the acid pool is greater than or equal to a second preset pH value.

7. A controller comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the steps of the water circulation system control method according to any one of claims 1 to 5 are implemented.

8. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method for controlling a water circulation system according to any one of claims 1 to 5 are implemented.

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