A method and device for regulating pressure dynamic discharge of a clean water tank

Abstract

The present application relates to a kind of for clear water tank pressure limiting dynamic discharge regulation and control method and device, it is related to drainage control technical field, it includes response to drainage signal, obtains current receiving end drainage capacity;Current drainage water quality pH value is obtained;If current drainage water quality pH value falls into the pH value range of pre-set standard water quality, current drainage pressure is obtained;Current drainage strategy is determined based on current drainage pressure and pre-set pressure limiting table, and current drainage valve group is determined by current drainage strategy;Current drainage valve group determines current drainage valve number;Current drainage valve number corresponding valve executes hierarchical drainage operation, and current drainage volume is obtained in real time until current drainage volume equals current receiving end drainage capacity.The present application has the effect of improving drainage efficiency according to the actual drainage pressure of clear water tank dynamic adjustment drainage mode.

Description

Technical Field

[0001] This invention relates to the field of drainage control technology, and in particular to a method and device for dynamic discharge regulation of pressure-limited water tanks. Background Technology

[0002] The discharge or recycling of clean water from the tank is an important aspect of wastewater treatment, effectively conserving water resources and ensuring the treatment quality at all levels. In practical engineering, technicians need to frequently monitor and calculate the liquid level and pH of the clean water tank to control the discharge, preventing water from overflowing due to untimely discharge, which would lead to water waste and pollution.

[0003] Regarding the aforementioned technologies, the drainage pipeline of the clear water tank typically uses a fixed valve opening for constant flow drainage. The drainage pipeline of the clear water tank cannot dynamically adjust the number of valves opened according to the static water pressure corresponding to the liquid level in the tank. Summary of the Invention

[0004] To address the shortcomings of existing constant flow drainage modes that cannot adaptively adjust drainage flow according to the static water pressure inside the tank, this invention provides a method and device for dynamic discharge control of pressure-limited water tanks.

[0005] In a first aspect, the present invention provides a method for dynamic discharge control of pressure limiting in a clear water tank, employing the following technical solution:

[0006] A method for dynamic discharge control of pressure limiting in clear water tanks includes:

[0007] S1: In response to the drainage signal, obtain the current drainage capacity of the receiving end;

[0008] S2: Obtain the current pH level of the wastewater;

[0009] S3: If the current drainage water quality pH falls within the preset acceptable pH range, obtain the current drainage pressure;

[0010] S30: Determine the current drainage strategy based on the current drainage pressure and the preset pressure limit gauge, and determine the current drainage valve group based on the current drainage strategy;

[0011] S31: Determine the current drain valve number based on the current drain valve group;

[0012] S32: Control the valve corresponding to the current drainage valve number to perform a graded drainage operation, and obtain the current drainage volume in real time until the current drainage volume equals the drainage capacity of the current receiving end.

[0013] By adopting the above technical solution, after receiving the drainage signal, the upper limit of the drainage volume that the receiving end can accommodate is first determined. At the same time, the quality of the discharged water is initially tested. When the water quality meets the standard requirements, the corresponding drainage strategy is matched with the current drainage pressure of the clean water tank. The drainage is achieved by opening the corresponding number of valves. The drainage flow can be dynamically adjusted according to the static water pressure in the tank. This avoids the overflow of the tank due to untimely drainage when the pressure is too high, and also avoids the instability of control caused by excessive drainage when the pressure is low. Compared with constant flow drainage with a fixed opening, it has better adaptability and can effectively improve the stability and safety of the clean water tank drainage process.

[0014] Optionally, it also includes a method for performing graded drainage operations if the current pH of the discharged water does not fall within the acceptable pH range. This method includes:

[0015] S40: Determine the single-segment drainage volume based on the preset segmented detection method, and obtain the current drainage segment number and the dynamic water quality pH corresponding to the current drainage segment number based on the single-segment drainage volume;

[0016] S41: Obtain the current discharge volume and the corresponding historical water quality pH level;

[0017] S42: Based on dynamic and historical water quality pH, combined with single-segment drainage volume and current drainage volume, the expected water quality pH at the receiving end is calculated to determine the pH.

[0018] S43: When the expected pH value at the receiving end falls within the acceptable pH range, obtain the current drainage pressure and execute steps S30 to S32.

[0019] S44: If the pH of the receiving end is not expected to fall within the acceptable pH range, output a drainage alarm signal to stop the graded drainage operation.

[0020] By adopting the above technical solution, for wastewater that fails the initial test, the water quality is assessed segment by segment through testing. The expected pH level after mixing at the receiving end is calculated by combining the historical water quality of the discharged water volume. If the expected pH level meets the requirements, normal discharge is allowed. If the pH level does not meet the requirements, discharge is stopped and an alarm is issued. This can prevent substandard wastewater from being discharged into the receiving end, affecting subsequent water treatment or recycling, and improve the stability of wastewater quality.

[0021] Optionally, step S43 further includes:

[0022] S430: Determine the rate of change of pH based on the expected pH of the receiving water and the historical pH of the water;

[0023] S431: When the rate of change of pH falls within the preset range of abnormal pH change rate, the results of acidic water quality and alkaline water quality are determined based on historical water quality pH and the range of pH of compliant water quality.

[0024] S4320: Determine the pH difference based on historical water quality pH and expected receiving water quality pH;

[0025] S4321: When the water quality is slightly acidic and the pH difference is negative, obtain the current drainage pressure and execute steps S30 to S32.

[0026] S4322: When the water quality is slightly acidic and the pH difference is positive, perform a constrained drainage operation based on the current drainage pressure and the preset drainage flow constraint scheme.

[0027] By adopting the above technical solution, when the expected pH of the receiving water meets the standard range, but the pH change rate fluctuates abnormally, the direction of water quality change can be determined by distinguishing between acidic and alkaline water, and by combining the positive and negative values ​​of the pH difference. Normal or restricted drainage can be selected accordingly, which can intervene in the water quality fluctuation trend in a timely manner, avoid the water quality from deviating from the standard range, and further improve the controllability of the discharged water quality.

[0028] Optional, also includes:

[0029] S4330: When the water quality is alkaline and the pH difference is negative, perform constrained drainage operation according to the drainage flux constraint scheme based on the current drainage pressure.

[0030] S4331: When there is a result indicating that the water quality is slightly alkaline and the pH difference is positive, obtain the current drainage pressure and execute steps S30 to S32.

[0031] By adopting the above technical solution, corresponding distinctions were made for different directions of change in alkaline water quality. When the pH difference is negative, it means that the pH is falling back towards the standard range. By restricting the drainage flow, the drainage speed is slowed down, allowing sufficient time for water quality adjustment. When the pH difference is positive, it means that the water quality has met the standard requirements and the trend is positive. The normal drainage can be carried out directly according to the pressure matching strategy, which takes into account both drainage efficiency and water quality stability.

[0032] Optionally, methods for performing constrained drainage operations include:

[0033] S4340: Obtain historical acidity / alkalinity sequence of wastewater;

[0034] S4341: Determine the trend of acidity and alkalinity changes in wastewater based on historical wastewater acidity and alkalinity sequences and current wastewater acidity and alkalinity.

[0035] S4342: Determine the acidic and alkaline trends based on the changes in water pH;

[0036] S4343: When there is a simultaneous result of alkaline water quality and an acidic trend, or a simultaneous result of acidic water quality and an alkaline trend, perform a restrained drainage operation.

[0037] By adopting the above technical solutions and combining the current water quality results with the long-term trend, when the water quality results are opposite to the trend, it indicates that the water quality is in the process of adjusting towards the standard range. At this time, by implementing the constraint drainage operation to slow down the drainage speed, it can not only ensure the smooth progress of the drainage process, but also leave a buffer space for water quality regulation and prevent the water quality from deviating further from the standard range.

[0038] Optionally, it also includes a method for performing a rapid drainage operation, the method comprising:

[0039] S4344: When there is both a result of water quality being slightly alkaline and a tendency to be slightly alkaline, or when there is both a result of water quality being slightly acidic and a tendency to be slightly acidic, an emergency drainage signal will be output.

[0040] S4345: In response to an emergency drainage signal, perform rapid drainage operation according to the preset maximum discharge plan.

[0041] By adopting the above technical solution, when the water quality results are consistent with the trend of change, it indicates that the water quality has been continuously deviating from the standard range. At this time, completing the drainage operation quickly can prevent the water quality from becoming increasingly unqualified, which would lead to a decrease in the amount of water that can be discharged at the normal discharge rate.

[0042] Optionally, specific methods for performing rapid drainage operations may also include:

[0043] S43450: Determine the current acid-base trend based on the alkaline and acidic trends;

[0044] S43451: Determine the maximum discharge rate based on the maximum discharge scenario and the current drainage pressure;

[0045] S43452: Generate the expected pH change curve based on the maximum discharge rate, current pH trend, current discharge volume and historical water quality pH.

[0046] S43453: Determine the end time of drainage operation based on the expected pH change curve;

[0047] S43454: Stop the rapid drainage operation at the end of the drainage operation time.

[0048] By adopting the above technical solution, the time point for stopping the drainage can be calculated in advance by combining the drainage rate and water quality change trend before rapid drainage. This allows for control of the drainage volume, avoiding excessive discharge that exceeds the capacity of the receiving end, and also enables early cessation of drainage, reducing the total amount of substandard water discharged.

[0049] Secondly, the present invention provides a pressure-limiting dynamic discharge control device for a clean water tank, which adopts the following technical solution:

[0050] A pressure-limiting dynamic discharge control device for a clean water tank, applied to the pressure-limiting dynamic discharge control method for a clean water tank as described above, includes an inlet pipe, an acid-base detection valve, a connection control device, a pressure valve group, and an outlet pipe group;

[0051] The upper end of the water inlet pipe is connected to the clean water tank, and the lower end of the water inlet pipe is connected to the control device. An acid-base detection valve is installed on the water inlet pipe to control the connection between the water inlet pipe and the control device.

[0052] The connection and control device is connected to the water pipe in the water outlet pipe group;

[0053] The pressure valves in the pressure valve group correspond one-to-one with the water pipes in the outlet pipe group, and are used to control the connection between the water pipes in the outlet pipe group and the connecting control device.

[0054] By adopting the above technical solution, multiple independent water outlet pipes are matched with corresponding pressure valves, and the number of water outlet pipes that can be opened can be flexibly selected according to the drainage strategy, and the overall drainage flow can be dynamically adjusted to achieve graded drainage that matches the current static water pressure of the clear water tank. The control structure is simple, reliable, and highly adaptable.

[0055] Optionally, the water outlet pipe assembly includes a first water outlet pipe, a second water outlet pipe, and a third water outlet pipe;

[0056] The connection control device is a four-way pipe, which includes a first port, a second port, a third port, and a fourth port. The first port is connected to the inlet pipe, the second port is connected to the first outlet pipe, the third port is connected to the second outlet pipe, and the fourth port is connected to the third outlet pipe.

[0057] By adopting the above technical solution and using a four-way pipe as a connection and control device, the inlet pipe and three outlet pipes can be connected simultaneously. The pipe connection structure is simple and does not require additional multi-path conversion structure, making it easy to centrally control the on / off status of different outlet pipes.

[0058] Optionally, the pressure valve group includes a first pressure valve, a second pressure valve, and a third pressure valve. The first pressure valve is located on the side of the first water outlet pipe near the connecting control device, the second pressure valve is located on the side of the second water outlet pipe near the connecting control device, and the third pressure valve is located on the side of the third water outlet pipe near the connecting control device. The three pressure valves respectively control the on / off state and drainage flow of different water outlet pipes.

[0059] By adopting the above technical solution, the three pressure valves independently control the on / off state of the corresponding water outlet pipes. One, two, or three pressure valves can be opened according to the current drainage pressure, resulting in different overall drainage flows. Staged drainage can be achieved by combining opening and closing without adjusting the opening of individual valves. The control logic is simpler, the control response speed is faster, and the reliability is higher.

[0060] In summary, the present invention has at least one of the following beneficial technical effects:

[0061] 1. The number of valves opened is automatically matched according to the static water pressure formed by the liquid level in the clear water tank, so as to realize staged drainage. This overcomes the drawback of traditional constant flow drainage which cannot adjust the flow rate with water pressure. It avoids downstream overflow caused by high pressure drainage too fast, and can also ensure drainage efficiency under low pressure conditions, thus improving the stability of clear water tank drainage operation.

[0062] 2. For water that instantaneously exceeds the standard, the pH value of the mixture is calculated by segmented water volume, and the overall water quality is assessed based on the neutralization effect of the downstream water body. At the same time, the acidity and alkalinity change rate and water quality deviation trend are combined to control the water in layers, distinguishing between three modes: normal drainage, flow restriction buffer, and emergency full-speed discharge. While strictly controlling water quality to meet the standards and preventing excessive discharge, the maximum amount of compliant discharge is retained, taking into account both environmental protection requirements and drainage capacity. Attached Figure Description

[0063] Figure 1 This is a schematic diagram of a pressure-limiting dynamic discharge control device for a clean water tank, as described in an embodiment of this application.

[0064] Figure 2 This is a flowchart of a method for dynamic discharge control of pressure limiting in a clear water tank, as described in an embodiment of this application.

[0065] Figure 3 This is a flowchart of a method for performing graded drainage operation if the current acidity or alkalinity of the effluent does not fall within the acceptable acidity or alkalinity range, as described in this application embodiment.

[0066] Figure 4 This is a flowchart of a method for performing a constrained drainage operation in an embodiment of this application.

[0067] The parts referred to by the numbers in the above attached diagrams are as follows: 1. Inlet pipe; 2. Acid-base detection valve; 3. First outlet pipe; 4. Second outlet pipe; 5. Third outlet pipe; 6. First pressure valve; 7. Second pressure valve; 8. Third pressure valve; 9. Connecting control device. Detailed Implementation

[0068] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0069] This invention discloses a device for dynamic discharge control of pressure limiting in a clear water tank. (Refer to...) Figure 1 A pressure-limiting dynamic discharge control device for a clean water tank includes an inlet pipe 1, an acid-base detection valve 2, a connection control device 9, a first pressure valve 6, a second pressure valve 7, a third pressure valve 8, a first outlet pipe 3, a second outlet pipe 4, and a third outlet pipe 5.

[0070] Four inlet pipe clips are installed on the outer circumferential surface of the top of the inlet pipe 1, which connect to the clean water tank. The inlet pipe 1 is connected to the clean water tank for drainage. An acid / alkali detection valve 2 is installed inside the inlet pipe 1. The inlet pipe 1 is connected to a control device 9. The control device 9 is a four-way pipe. The four-way pipe includes a first port, a second port, a third port, and a fourth port. The first port is threaded to the inlet pipe 1, the second port is threaded to the first outlet pipe 3, the third port is threaded to the second outlet pipe 4, and the fourth port is threaded to the third outlet pipe 5. Each connection point is equipped with a sealing rubber ring to improve the sealing of the pipe connection and prevent leakage during drainage. The nominal diameter of the inlet pipe 1 is preferably DN80 to DN150, and the material is 304 stainless steel or UPVC.

[0071] An acid-base detection valve 2 is installed inside the inlet pipe 1. This valve is a composite functional unit integrating an online glass electrode pH sensor and an electrically controlled shut-off valve. The probe of the online glass electrode pH sensor is inserted into the centerline of the inlet pipe 1 flow channel to collect the hydrogen ion concentration index of the water to be discharged in real time. The electrically controlled shut-off valve is an electric ball valve or electric butterfly valve, controlled by a PLC or DCS control system, realizing integrated operation of detection, judgment, and on / off switching. If the pH level is within the acceptable range, the acid-base detection valve 2 controls the opening of the inlet pipe 1, allowing water to drain into the connected control device 9.

[0072] The first pressure valve 6, the second pressure valve 7, and the third pressure valve 8 are respectively installed on the first outlet pipe 3, the second outlet pipe 4, and the third outlet pipe 5, and are used to control the connection between the first outlet pipe 3, the second outlet pipe 4, and the third outlet pipe 5 and the connecting control device 9, so as to achieve the purpose of diversion and control. All three pressure valves are electrically controlled butterfly valves with two working positions: fully open and fully closed.

[0073] The connecting control device 9 uses a four-way pipe of equal diameter, including a first port, a second port, a third port, and a fourth port. The first port faces vertically upward and is connected to the inlet pipe 1; the second port faces horizontally to the right and is connected to the first outlet pipe 3; the third port faces horizontally to the left and is connected to the second outlet pipe 4; the fourth port faces downward at an angle or vertically downward and is connected to the third outlet pipe 5. The four-way pipe serves as a diversion and pressure stabilizing chamber.

[0074] Pressure detectors are installed in the first outlet pipe 3, the second outlet pipe 4, and the third outlet pipe 5, with control values ​​of P1, P2, and P3, respectively. Taking the first pressure valve 6 and the first outlet pipe 3 as an example, the pressure detectors detect the water pressure. When the water pressure exceeds P1, the first pressure valve 6 is opened, allowing drainage through the first outlet pipe 3.

[0075] As a preferred embodiment, the rated flow coefficients of the three pressure valves are... The value typically ranges from 0.60 to 0.85. The volumetric flow rate of a single outlet pipe with the valve fully open is determined by the orifice outflow equation, which is simplified from Bernoulli's equation. The expression is: ,in For the first Real-time volumetric flow rate of the root outlet pipe, in cubic meters per second; The comprehensive flow coefficient; This refers to the cross-sectional area of ​​the water outlet pipe, in square meters. This refers to the hydrostatic pressure acting at the inlet of the control device 9; Current water temperature The density of the clear water below.

[0076] Instead of using a constant value, the water temperature is collected in real time by a temperature sensor added at point 1 of the inlet pipe. And calculate using a linear approximation formula: , for The density of the clean water at that time was taken as 999.84 kg per cubic meter; The thermal expansion coefficient of water is approximately taken as... per degree Celsius; The measured water temperature is in degrees Celsius. This temperature compensation eliminates the impact of density drift caused by seasonal water temperature variations on the pressure-flow mapping relationship.

[0077] Water quality is monitored by an acid-base detector to ensure that the discharged water meets the standards. Water pressure is monitored by a pressure detector. Water can be discharged through different numbers of outlet pipes depending on the water pressure, thereby controlling the discharge rate and water level.

[0078] Based on the same inventive concept, embodiments of the present invention provide a method for dynamic discharge control of pressure limiting in clear water tanks.

[0079] Reference Figure 2 A method for dynamic discharge control of pressure limiting in clear water tanks, comprising:

[0080] Step S1: In response to the drainage signal, obtain the current drainage capacity of the receiving end.

[0081] The drainage signal is the signal that triggers the drainage control process of the clean water tank. This signal is triggered when water pressure is detected in the tank, specifically by the level sensor when the tank level reaches or exceeds a preset drainage threshold height. The drainage threshold height is the preset upper limit of the safe operating level for the clean water tank. When the level reaches this height, drainage operation needs to be initiated to prevent the tank from overflowing due to excessive liquid level.

[0082] The current receiving end drainage capacity refers to the maximum drainage volume that the downstream water storage unit can accept when receiving water discharged from the clean water tank.

[0083] Step S2: Obtain the current pH level of the effluent.

[0084] The current acidity / alkalinity of the effluent refers to the hydrogen ion concentration index of the effluent to be discharged, which is detected at the outlet of the clear water tank. It is collected in real time by the acid / alkalinity detector installed on the inlet pipe 1, in conjunction with the acid / alkalinity detection valve 2 to determine whether the effluent quality meets the discharge requirements. This allows for timely suspension of the effluent operation when the water quality does not meet the standards, thus avoiding any impact on the water quality at the downstream receiving end.

[0085] Step S3: If the current drainage water pH falls within the preset acceptable pH range, obtain the current drainage pressure.

[0086] The acceptable pH range refers to the pre-defined pH interval that meets the downstream receiving water quality standards, set according to discharge requirements. This interval is pre-entered into the system by operators based on actual discharge specifications, and the specific pH range is 6 to 9. The current discharge pressure P is calculated from the clear water tank level height h using the basic equations of fluid statics. Where g is the local gravitational acceleration, which is taken as 9.8 in this embodiment; h is the real-time liquid level measured by the liquid level sensor.

[0087] The current drainage pressure refers to the static pressure of the water body generated by the water level inside the clear water tank and acting on the pipeline of the connecting control device 9. The pressure value directly corresponds to the real-time liquid level inside the tank.

[0088] If the current pH of the discharged water falls within the acceptable range, it means that the instantaneous water quality of the water body to be discharged meets the environmental protection discharge requirements by independent testing. There is no need to rely on the downstream existing water body for neutralization and buffering, and the graded discharge can be carried out directly according to the pressure inside the tank.

[0089] Step S30: Determine the current drainage strategy based on the current drainage pressure and the preset pressure limit gauge, and determine the current drainage valve group based on the current drainage strategy.

[0090] The pressure gauge is a mapping relationship between pressure ranges and valve opening schemes pre-stored in the non-volatile memory of the control system. It includes at least the following three quantification levels: Level 1 is low pressure level, corresponding to a static water pressure P greater than or equal to 0 and less than 0.03 MPa, a liquid level h greater than or equal to 0 and less than 3.06 meters, and the number of valves opened n is 1, opening the first pressure valve 6, with the strategy name being low pressure single valve; Level 2 is medium pressure level, corresponding to a static water pressure P greater than or equal to 0.03 and less than 0.06 MPa, a liquid level h greater than or equal to 3.06 and less than 6.12 meters, and the number of valves opened n is 2, opening the first pressure valve 6 and the second pressure valve 7, with the strategy name being medium pressure dual valve; Level 3 is high pressure level, corresponding to a static water pressure P greater than or equal to 0.06 MPa, a liquid level h greater than or equal to 6.12 meters, and the number of valves opened n is 3, opening the first pressure valve 6, the second pressure valve 7, and the third pressure valve 8, with the strategy name being high pressure triple valve. The pressure range mentioned above is determined by the designer based on the maximum allowable inflow rate, pipe diameter, and safety margin at the downstream receiving end. If n valves are opened and all pipe parameters are identical, the total drainage flow rate is: This formula shows that when the switching valve is fully open, the total flow rate increases linearly with the square root of the pressure P and the number of valves n that are open, thus achieving adaptive graded drainage with high pressure and low pressure without the need for frequency conversion speed regulation.

[0091] The current drainage strategy refers to the drainage flow control scheme derived from real-time pipeline pressure matching, which determines the number of valves that need to be opened for this drainage.

[0092] The current drainage valve group refers to a group of pressure valves that need to be opened synchronously under the same pressure level, and is divided into three categories: single valve group, double valve group, and triple valve group.

[0093] Step S31: Determine the current drain valve number based on the current drain valve group.

[0094] The current drain valve number refers to the number used to distinguish the first pressure valve 6, the second pressure valve 7, and the third pressure valve 8, which is pre-recorded in the control system.

[0095] Step S32: Control the valve corresponding to the current drainage valve number to perform a graded drainage operation, and obtain the current drainage volume in real time until the current drainage volume equals the current receiving end drainage capacity.

[0096] The staged drainage operation refers to the drainage action of opening a corresponding number of outlet pipe pressure valves according to the current drainage strategy.

[0097] Current discharge volume refers to the total amount of water discharged from the clean water tank to the downstream receiving end from the start of discharge to the current moment, which is continuously collected by the flow sensors installed at the discharge outlet of each water outlet pipe.

[0098] If the current drainage volume equals the current drainage capacity of the receiving end, it means that the downstream water storage unit has reached its designed capacity and the drainage process is complete. At this point, the control system does not need to continue to perform the staged drainage operation.

[0099] In order to avoid water hammer effect on the four-way pipe 9 and downstream pipelines when multiple pressure valves are opened for staged drainage, the system can control the valve opening sequence to stagger peak times. The opening interval between adjacent valves... Determined by Joukowsky's water hammer theory: .

[0100] Where L is the equivalent length of the outlet pipe, which includes the equivalent straight pipe length converted from local resistance; ac is the water hammer wave velocity. The water hammer wave velocity is determined by the pipe material's elastic modulus E, the pipe wall thickness δ, and the clear water volume elastic modulus K, and the calculation formula is: Where D is the inner diameter of the pipe, and δ is the pipe wall thickness. During implementation, the first pressure valve 6 is fully opened first, passing through… After a certain time, the second pressure valve 7 opens, and then... After a certain time, the third pressure valve 8 opens. This timing sequence disperses the pressure peak when multiple valves open simultaneously into a stepped increase.

[0101] Reference Figure 3 It also includes a method for performing graded drainage operations if the current pH of the discharged water does not fall within the acceptable pH range. This method includes:

[0102] Step S40: Determine the single-segment drainage volume based on the preset segmented detection method, and obtain the current drainage segment number and the dynamic water quality pH corresponding to the current drainage segment number based on the single-segment drainage volume.

[0103] The segmented detection method refers to the system dividing the discharged water into independent units according to a fixed volume, storing the water volume and pH data of each segment, and using this data to calculate the pH after mixing and neutralizing multiple batches of water.

[0104] Single-segment drainage volume refers to the standard volume of a single segment of water body pre-set by the segmented detection method.

[0105] The current drainage section number refers to the sequence number of the water body corresponding to the drainage volume of each single section during this drainage process, which is generated sequentially according to the drainage time.

[0106] Dynamic water quality pH refers to the real-time pH value of the effluent corresponding to the current drainage section. It is obtained by the pH detector collecting the pH value of the water body connected to the control device 9 at the drainage time corresponding to the current drainage section number.

[0107] Step S41: Obtain the current drainage volume and the corresponding historical water quality pH.

[0108] Historical water quality pH refers to the overall pH value of the existing water body at the downstream receiving end, calculated from the pH test data of the water body stored in each historical drainage segment obtained by dividing the drainage volume into single segments.

[0109] Step S42: Based on dynamic water quality pH and historical water quality pH, combined with single-segment drainage volume and current drainage volume, calculate to determine the expected water quality pH at the receiving end.

[0110] The expected pH value of the receiving water refers to the comprehensive pH value of all water bodies after thorough mixing, calculated based on the volume and pH of the water body with the current discharge volume and the water body with the current discharge segment number at the downstream receiving end.

[0111] Let the current water volume at the receiving end be... The unit is liters, and this value equals the cumulative amount of water discharged. Historical overall pH was ;No. Segmented dynamic detection of pH The actual drainage volume of this section is The hydrogen ion concentration after mixing is then... for: .

[0112] The expected pH value of the receiving end mixture is denoted as Calculated from the pH definition: .

[0113] The derivation of this formula is as follows: According to the definition of pH... ,therefore The total amount of hydrogen ions remains constant before and after mixing, i.e., the total amount of substance is... The unit is moles. Total volume after mixing. The unit is liters. Hydrogen ion concentration after mixing. Then take the negative logarithm to get This derivation is based on the assumption that the hydrogen ion activity coefficient in dilute solutions is approximately 1. For a pure water system, its ionic strength is less than... The calculation error introduced is less than 0.01 pH per mole per liter, which meets the engineering control accuracy requirements. If the water body contains a significant buffering system, such as carbonate hardness greater than 5 mmol / L, charge balance iteration or buffer capacity correction is required. However, this solution is for a clear water tank, and the above simplification is appropriate and sufficient.

[0114] For example: Suppose the receiving end already has a stored water volume. It is 500 liters. The actual drainage volume of the new section is 8.8. The volume was 50 liters, and the dynamic pH was measured. The value is 5.5. Therefore, the historical hydrogen ion concentration... Moles per liter; new fraction hydrogen ion concentration Moles per liter; hydrogen ion concentration after mixing moles per liter; expected mixed pH The value falls within the acceptable range of 6 to 9, therefore this segment is allowed to be included.

[0115] Step S43: When the expected pH of the receiving end falls within the acceptable pH range, obtain the current drainage pressure and execute steps S30 to S32.

[0116] When the expected pH level at the receiving end falls within the acceptable range, it indicates that the overall water quality after the newly added single-segment drainage water body is mixed with the existing water body at the receiving end can still meet the discharge requirements, and the discharge volume can be carried out.

[0117] Step S44: If the expected pH level at the receiving end does not fall within the acceptable pH range for water quality, output a drainage alarm signal to stop the graded drainage operation.

[0118] The drainage alarm signal is a warning signal output by the control system indicating that the current discharge does not meet the water quality requirements. It is simultaneously transmitted to the central control platform to remind maintenance personnel to intervene and handle the situation. At the same time, it locks the valve drive command to prevent non-compliant water from being discharged into the downstream receiving end.

[0119] If the expected pH level at the receiving end does not fall within the acceptable range, it means that even if the water volume of this single-segment discharge is discharged into the downstream receiving end, the overall pH level of the mixed water will not meet the discharge requirements. Therefore, the discharge operation should be stopped to avoid adverse effects on the water environment caused by illegal discharge.

[0120] Step S43 further includes:

[0121] Step S430: Determine the rate of change of pH based on the expected pH of the receiving water and the historical pH of the water.

[0122] The pH change rate refers to the magnitude of change in the overall pH of the mixed water at the downstream receiving end after a single stage of wastewater discharge is introduced, indicating the rate at which the water body's pH balance is disrupted. The specific formula for calculating the pH change rate is: .in, This is the difference in pH levels. ; .

[0123] Step S431: When the rate of change in pH falls within the preset range of abnormal pH change rates, determine the results of acidic water quality and alkaline water quality based on historical water quality pH and the range of pH of compliant water quality.

[0124] The abnormal pH change rate range refers to a pre-defined interval of pH change that exceeds the normal emission fluctuation range. This embodiment uses an abnormal change rate threshold. It is 5%.

[0125] A slightly acidic water quality result means that the historical water quality pH is closer to the left interval of the acceptable water quality pH range, that is, closer to the lower limit of the acceptable water quality pH range. In this embodiment, the acceptable water quality pH range is set to 6 to 9, and the slightly acidic water quality result means that the historical water quality pH is closer to 6.

[0126] The result of slightly alkaline water quality means that the historical water quality pH is closer to the right interval of the standard water quality pH range, that is, closer to the upper limit of the standard water quality pH range. In this embodiment, the result of slightly alkaline water quality means that the historical water quality pH is closer to 9.

[0127] The judgment rule is: if Less than the median value If the value is 7.5, then the water is considered acidic; if... Greater than the median value A score of 7.5 indicates that the water is alkaline.

[0128] When the rate of change in pH falls into the range of abnormal pH change, it indicates that the pH of the water body at the receiving end will deviate significantly due to the pH of this single-segment drainage. If the drainage flow is not adjusted, the overall pH will jump out of the acceptable pH range in a short period of time. It is necessary to adjust the drainage flow based on the results of acidic and alkaline water quality to slow down the pH deviation by constraining the drainage rate.

[0129] Step S4320: Determine the pH difference based on historical water pH and expected receiving water pH.

[0130] The pH difference is the difference between the historical pH value and the expected pH value of the receiving water. It is used to determine in which direction the overall pH value will shift due to the new drainage.

[0131] Step S4321: When the water quality is slightly acidic and the pH difference is negative, obtain the current drainage pressure and execute steps S30 to S32.

[0132] When the water quality is slightly acidic and the pH difference is negative, it means that the acidity of the water discharged is lower than that of the water at the receiving end. This will raise the overall pH value at the receiving end, offsetting the original trend of the water being slightly acidic. The overall water quality will not fall below the lower limit. Therefore, steps S30 to S32 can be executed directly to perform the graded drainage operation normally.

[0133] Step S4322: When the water quality is slightly acidic and the pH difference is positive, perform a constrained drainage operation based on the current drainage pressure and the preset drainage flow constraint scheme.

[0134] A drainage flux constraint scheme refers to a pre-set drainage plan that adjusts the corresponding drainage flux based on the current drainage pressure. Specifically, it slows down the drainage rate to allow downstream receiving water time for buffering and mixing, preventing the overall pH from rapidly deviating from the lower limit of the acceptable water quality pH range within a short period. The drainage flux constraint scheme also involves determining the number of valves that should be opened based on the pressure gauge readings. Decrease by 1, ensuring at least one valve remains open, to obtain the constrained number of open valves. Corresponding to total flow .

[0135] Constrained drainage operation refers to a drainage operation that reduces the number of valves currently open based on a drainage flux constraint scheme. By reducing the drainage volume per unit time, it slows down the rate of pH decrease and prevents the overall pH from falling below the lower limit of the acceptable water quality pH range in a short period of time.

[0136] When the water quality is slightly acidic and the pH difference is positive, it indicates that the original water quality at the receiving end is already close to the lower limit of the acceptable pH range. The new drainage will cause the pH to shift further towards acidity. If the drainage is carried out according to the original matching drainage strategy, the pH will drop rapidly below the lower limit of the acceptable pH range. Therefore, according to the drainage flow constraint scheme, the number of valves currently open is adjusted to slow down the rate of pH decrease by reducing the drainage flow.

[0137] This also includes:

[0138] Step S4330: When there is a result of alkaline water quality and the pH difference is negative, perform constrained drainage operation according to the drainage flux constraint scheme based on the current drainage pressure.

[0139] When the water quality is alkaline and the pH difference is negative, it indicates that the original receiving water body is already close to the upper limit of the pH range for compliant water quality. The new drainage will further increase the overall alkalinity. If the drainage is carried out directly according to the original drainage strategy, the pH will quickly exceed the upper limit of the pH range for compliant water quality. Therefore, the drainage flux constraint scheme is used to reduce the drainage flux and slow down the rate of pH increase.

[0140] Step S4331: When there is a result indicating that the water quality is slightly alkaline and the pH difference is positive, obtain the current drainage pressure and execute steps S30 to S32.

[0141] When the water quality is slightly alkaline and the pH difference is positive, it means that the pH of the water discharged into the water body is lower than that of the original receiving water body. This will lower the overall pH value of the downstream water body and offset the original trend of alkalinity. Therefore, the drainage can be carried out in stages according to the original pressure matching drainage strategy without any additional adjustment to the drainage flow rate.

[0142] Reference Figure 4 The methods for performing constrained drainage operations include:

[0143] Step S4340: Obtain the historical acidity / alkalinity sequence of the wastewater.

[0144] Historical wastewater pH sequence refers to a data sequence formed by the pH values ​​of water bodies corresponding to several consecutive current wastewater section numbers.

[0145] Step S4341: Determine the trend of acidity and alkalinity changes based on the historical acidity and alkalinity sequence of the wastewater and the current acidity and alkalinity of the wastewater.

[0146] The trend of water quality acidity and alkalinity change refers to the trend of water quality acidity and alkalinity continuously increasing or decreasing, which is obtained by combining the time sequence information in the current drainage section number with the corresponding water body pH value.

[0147] The trend of water pH variation was determined using sliding window least squares linear regression. The most recent value was taken. The detection values ​​corresponding to each segment, for example Take 5, denoted as ,in The time sequence is segment numbered. Trend slope Calculated using the following formula: In the above formula: The slope represents the trend, expressed in pH increments. This formula is the standard least squares linear regression coefficient formula, mapping time-series pH data to a monotonicity discriminant.

[0148] Step S4342: Determine the acidic and alkaline trends based on the changes in water pH.

[0149] Acidity trend refers to the overall trend of a gradual decrease in pH across multiple drainage sections.

[0150] The trend of increasing alkalinity refers to the overall change in pH level of multiple drainage sections.

[0151] Step S4343: When there is both alkaline and acidic water quality, or both acidic and alkaline water quality, perform a constrained drainage operation.

[0152] When both alkaline and acidic water quality are present, or both acidic and alkaline water quality are present, it indicates that the current pH trend is moving towards the middle value of the acceptable pH range. The discharged water will gradually offset the current pH deviation trend, and a restrained drainage operation can be performed to wait for the water quality to gradually return to the acceptable range.

[0153] This also includes a method for performing a rapid drainage operation, the method comprising:

[0154] S4344: When there is both an alkaline water quality result and an alkaline trend, or when there is both an acidic water quality result and an acidic trend, an emergency drainage signal will be output.

[0155] An emergency drainage signal is an emergency warning signal sent by the control system to the central control platform, indicating that the current drainage pH level is accelerating its deviation in the original direction, and even if a constraint drainage operation is performed, it cannot prevent the overall pH level from jumping out of the acceptable range.

[0156] When both alkaline results and alkaline trends are present, or both acidic results and acidic trends are present, it indicates that the pH of the discharged water is continuously shifting towards its original direction at an accelerating rate. Even if the volume of each drainage segment is reduced and the drainage speed is slowed down, it is impossible to prevent the overall pH from exceeding the acceptable range. If the volume of each drainage segment is further reduced, the water introduced through inlet pipe 1 will deviate further from the acceptable pH range over time. Therefore, it is necessary to perform subsequent rapid drainage operations to speed up the discharge of water.

[0157] S4345: In response to an emergency drainage signal, perform rapid drainage operation according to the preset maximum discharge plan.

[0158] The maximum discharge plan refers to a pre-stored drainage plan set up for emergencies. It prioritizes ensuring that all drainage valves with matching pressure are opened simultaneously before the overall water quality falls outside the acceptable range, thereby accelerating the drainage process and completing the discharge of the compliant water volume as much as possible before the water quality exceeds the standard.

[0159] Rapid drainage operation refers to opening all drainage valves that meet the pressure requirements and discharging water into the downstream receiving end at the maximum drainage rate per unit time. The goal is to complete the compliant drainage operation as soon as possible before the overall pH level after mixing exceeds the acceptable range, thereby reducing the loss of drainage volume due to water quality exceeding the standard.

[0160] The specific methods for performing rapid drainage operations also include:

[0161] S43450: Determine the current acid-base trend based on the alkaline and acidic trends.

[0162] The current acid-base trend refers to the acidity-base trend determined by the alkaline trend and the acidic trend. Only one of the alkaline trend and the acidic trend can occur at the same time. When an acidic trend exists, the acidic trend is defined as the current acid-base trend, and vice versa.

[0163] S43451: Determine the maximum emission rate based on the maximum emission scheme and the current drainage pressure.

[0164] Maximum discharge rate refers to the maximum volume of water that can be discharged per unit time when all outlet pipes are opened simultaneously. It is calculated from the rated pipe diameter parameters of each outlet pipe and the current pressure. Number of fully open valves and current pressure Sure: .

[0165] S43452: Based on the maximum discharge rate, current acid-base trend, current discharge volume, and historical water quality acid-base, generate the expected acid-base change curve.

[0166] The predicted pH change curve is a trend curve generated with the duration of drainage as the horizontal axis and the pH of the mixed water at the downstream receiving end as the vertical axis. The curve will update a new pH value after mixing for each additional unit of maximum discharge rate. Connecting all the values ​​will give a complete change trajectory, which can intuitively show the trend of pH change of the mixed water at the downstream receiving end before the completion of this discharge. It can predict in advance whether the pH of the mixed water will exceed the standard pH range before the completion of this drainage.

[0167] The pH change curve is expected to be generated by the following discrete recursive model. Let the time step for the rapid drainage stage be... For example, taking 1 second, the amount of water discharged per step The current drainage volume, i.e., the existing water volume at the receiving end, is denoted as... This is equal to the cumulative amount of water already discharged. Initial cumulative amount of hydrogen ions The unit is mole. The iterative calculation is as follows: First, the pH of the water discharged into the body in this step is obtained by trend extrapolation, denoted as... : In the above formula: The trend symbol is set to positive 1 for a more alkaline trend and negative 1 for a more acidic trend. The absolute value of the trend slope calculated in step S4341; This refers to the time step number; This refers to the step water volume; For the first The actual drainage volume is set in stages. The second step is to accumulate the amount of hydrogen ions. : The third step is to accumulate the total water volume. : Step four, the... Step-by-step pH mixing: .

[0168] This recursive model is a temporal extension of the mixing pH formula in step S42. Each step strictly adheres to the conservation of hydrogen ion content, representing an interdisciplinary application of analytical chemistry and discrete control theory. Discretization of the step size transforms the continuous drainage process into a computable difference equation, suitable for real-time iteration in embedded control systems. The model error mainly stems from trend extrapolation, which assumes that future segments will strictly follow historical linear trends. However, in short-term drainage, such as within minutes, the evolution of water quality in the clear water tank usually exhibits inertia, making linear extrapolation errors controllable.

[0169] S43453: Determine the end time of drainage operation based on the expected pH change curve.

[0170] The end time of drainage operation refers to the critical point at which the pH of the downstream receiving water body after mixing is about to exceed the standard pH range, as determined by the expected pH change curve.

[0171] Drainage operation end time The solution method is as follows: From Begin iterating until the first instance of a mixed pH exceeding the upper limit is observed. That is, 9 (corresponding to a tendency towards alkalinity) or the mixed pH is less than the lower limit of compliance. That is, 6 (corresponding to a slightly acidic trend). Record this critical step number as... The downtime point is: The control system was... Simultaneously close all pressure valves to terminate rapid drainage. If the total accumulated water volume is reached... equal If the boundary is not triggered, then the shutdown time point is... The drainage process was completed normally.

[0172] S43454: Stop the rapid drainage operation at the end of the drainage operation time.

[0173] When there is a time point for the drainage operation to end, it means that the pH of the mixed water at the downstream receiving end will exceed the acceptable range before the expected drainage volume is discharged. Therefore, it is necessary to immediately close all drainage valves when the critical time point is reached to terminate the rapid drainage operation and avoid illegal discharge.

[0174] Numerical example: Let the current water volume at the receiving end be... For 50 liters, historical comprehensive pH The pH value is 8.8, indicating alkaline water quality. The current pH trend is towards alkalinity, with a slope of [missing value]. Take a positive value of 0.1; Current segment dynamic pH It is 9.1; maximum emission rate 2 liters per second; time step 1 second; step water volume 2 liters; segmented volume The value is 50 liters. Based on the conservation of the amount of hydrogen ions, the deduction is as follows:

[0175] exist At that moment, only the original water body remained, and the cumulative amount of hydrogen ions... Moles, cumulative water volume The volume was increased, and the mixed pH was 8.80.

[0176] exist At what time, the pH of the water discharged into the body The hydrogen ion concentration is Moles per liter; cumulative amount of hydrogen ions Moles; Cumulative water volume Increase; mixed hydrogen ion concentration moles per liter; mixed pH .

[0177] exist At what time, the pH of the water discharged into the body The hydrogen ion concentration is Moles per liter; cumulative amount of hydrogen ions Moles; Cumulative water volume Increase; mixed hydrogen ion concentration moles per liter; mixed pH .

[0178] Continuous iterations revealed that the mixed pH level slowly and steadily approached the upper limit of 9. The control system could calculate the critical step at which the pH would exceed the upper limit based on the curve. This allows for the determination of the downtime. And stop the drainage in advance to avoid water bodies exceeding the discharge standards.

[0179] Furthermore, as a more preferred inventive step in this embodiment, based on the above-mentioned fixed target capacity... Based on the existing drainage control, an adaptive capacity regulation method for the receiving end based on dynamic evaluation of acid-base neutralization equivalent is introduced, including the following steps:

[0180] Step C1: Obtain the current volume of water at the receiving end. Comprehensive pH Based on the acidity or alkalinity result determined in step S431, calculate the acid-base neutralization equivalent of the existing water body. If the result indicates that the water is acidic, then... The buffer equivalent in the alkaline direction is: If the result is determined to be that the water is slightly alkaline, then... The buffer equivalent in the acid direction is: .

[0181] In the above formula: It is the acid-base neutralization equivalent, with the unit being moles. It represents the amount of hydrogen ions or hydroxide ions that the remaining water at the receiving end can still accept without exceeding the corresponding directional boundary. and These represent the lower and upper limits of compliance, respectively; in this embodiment, they are taken as 6 and 9. To achieve the median standard of 7.5. This formula is derived based on the conservation of hydrogen ion content: taking a slightly alkaline result as an example, the current hydrogen ion concentration in the existing water body is... If it drops to the lower limit The hydrogen ion concentration needs to be increased to The concentration increment is Multiply by the existing volume This gives the amount of additional hydrogen ions that can be accepted.

[0182] Step C2: Obtain the dynamic pH of the water body to be discharged. Calculate the consumption rate per unit volume of this water body to the neutralization equivalent at the receiving end. : .

[0183] In the above formula: The acid-base load per unit volume, expressed in moles per liter, represents the absolute value of the shift in the amount of hydrogen ions produced relative to the median acid-base state at the receiving end for every liter of this water discharged. When far from the median, As the volume increases, the amount of neutralization equivalent consumed per unit volume also increases.

[0184] Step C3: Based on the remaining neutralization equivalent With consumption rate Dynamically adjust the current acceptable drainage capacity of the receiving end. The remaining neutralization equivalent is obtained by subtracting the equivalent already consumed in each segment from the initial neutralization equivalent: .

[0185] In the above formula: This represents the number of drainage sections that have been completed. For the first Actual drainage volume of each section; For the first The acid-base load per unit volume corresponding to each segment. The dynamic acceptable capacity is: .

[0186] In the above formula: This is the dynamically adjusted acceptable capacity, in liters. If The pH of the water to be discharged approaches zero, meaning the pH of the water is close to the median value of 7.5. Theoretically, it tends to reach its maximum, at which point the physical capacity limit is reached. For constraints; if The maximum value is... Possibly much smaller At this point, chemical capacity is used as a constraint to prevent the pH of the receiving end from exceeding the limit.

[0187] Step C4: During the staged drainage or rapid drainage process, with Replace or add to fixed target capacity As a basis for shutdown determination, the mixing pH at the receiving end is monitored in real time and the remaining neutralization equivalent is updated iteratively in parallel. Specifically, the control system compares the current cumulative drainage volume at each time step. and The smaller of the two is taken as the actual control target; at the same time, the mixing pH trajectory is continuously verified by a recursive model, forming a dual constraint of chemical capacity and physical capacity.

[0188] Step C5: When the remaining neutralization equivalent Reduced to a safe threshold Below, or when the mixed pH reaches the target boundary, regardless of whether the physical capacity has been reached. Drainage must be stopped immediately upon arrival. The safety threshold is defined as: .

[0189] In the above formula: For safety margin, a value of 0.1 to 0.2 is used; This is the acid-base neutralization equivalent at the beginning of this drainage cycle. This threshold ensures that the receiving end always maintains a certain acid-base buffer margin, preventing unforeseen pH fluctuations or sensor measurement errors from causing excessive discharge.

[0190] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional modules is used as an example. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. The specific working process of the system, device, and unit described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0191] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A method for dynamic discharge control of pressure limiting in a clear water tank, characterized in that, include: S1: In response to the drainage signal, obtain the current drainage capacity of the receiving end; S2: Obtain the current pH level of the wastewater; S3: If the current drainage water quality pH falls within the preset acceptable pH range, obtain the current drainage pressure; S30: Determine the current drainage strategy based on the current drainage pressure and the preset pressure limit gauge, and determine the current drainage valve group based on the current drainage strategy; S31: Determine the current drain valve number based on the current drain valve group; S32: Control the valve corresponding to the current drainage valve number to perform a graded drainage operation, and obtain the current drainage volume in real time until the current drainage volume equals the drainage capacity of the current receiving end.

2. The method for dynamic discharge control of pressure limiting in a clear water tank according to claim 1, characterized in that, It also includes a method for performing graded drainage operations if the current pH of the discharged water does not fall within the acceptable pH range. This method includes: S40: Determine the single-segment drainage volume based on the preset segmented detection method, and obtain the current drainage segment number and the dynamic water quality pH corresponding to the current drainage segment number based on the single-segment drainage volume; S41: Obtain the current discharge volume and the corresponding historical water quality pH level; S42: Based on dynamic and historical water quality pH, combined with single-segment drainage volume and current drainage volume, the expected water quality pH at the receiving end is calculated to determine the pH. S43: When the expected pH value at the receiving end falls within the acceptable pH range, obtain the current drainage pressure and execute steps S30 to S32. S44: If the pH of the receiving end is not expected to fall within the acceptable pH range, output a drainage alarm signal to stop the graded drainage operation.

3. The method for dynamic discharge control of pressure limiting in a clear water tank according to claim 2, characterized in that, Step S43 also includes: S430: Determine the rate of change of pH based on the expected pH of the receiving water and the historical pH of the water; S431: When the rate of change of pH falls within the preset range of abnormal pH change rate, the results of acidic water quality and alkaline water quality are determined based on historical water quality pH and the range of pH of compliant water quality. S4320: Determine the pH difference based on historical water quality pH and expected receiving water quality pH; S4321: When the water quality is slightly acidic and the pH difference is negative, obtain the current drainage pressure and execute steps S30 to S32. S4322: When the water quality is slightly acidic and the pH difference is positive, perform a constrained drainage operation based on the current drainage pressure and the preset drainage flow constraint scheme.

4. The method for dynamic discharge control of pressure limiting in a clear water tank according to claim 3, characterized in that, Also includes: S4330: When the water quality is alkaline and the pH difference is negative, perform constrained drainage operation according to the drainage flux constraint scheme based on the current drainage pressure. S4331: When there is a result indicating that the water quality is slightly alkaline and the pH difference is positive, obtain the current drainage pressure and execute steps S30 to S32.

5. The method for dynamic discharge control of pressure limiting in a clear water tank according to claim 4, characterized in that, Methods for performing constrained drainage operations include: S4340: Obtain historical acidity / alkalinity sequence of wastewater; S4341: Determine the trend of acidity and alkalinity changes in wastewater based on historical wastewater acidity and alkalinity sequences and current wastewater acidity and alkalinity. S4342: Determine the acidic and alkaline trends based on the changes in water pH; S4343: When there is a simultaneous result of alkaline water quality and an acidic trend, or a simultaneous result of acidic water quality and an alkaline trend, perform a restrained drainage operation.

6. The method for dynamic discharge control of pressure limiting in a clear water tank according to claim 5, characterized in that, It also includes a method for performing a rapid drainage operation, the method comprising: S4344: When there is both a result of water quality being slightly alkaline and a tendency to be slightly alkaline, or when there is both a result of water quality being slightly acidic and a tendency to be slightly acidic, an emergency drainage signal will be output. S4345: In response to an emergency drainage signal, perform rapid drainage operation according to the preset maximum discharge plan.

7. The method for dynamic discharge control of pressure limiting in a clear water tank according to claim 6, characterized in that, Specific methods for performing rapid drainage operations also include: S43450: Determine the current acid-base trend based on the alkaline and acidic trends; S43451: Determine the maximum discharge rate based on the maximum discharge scenario and the current drainage pressure; S43452: Generate the expected pH change curve based on the maximum discharge rate, current pH trend, current discharge volume and historical water quality pH. S43453: Determine the end time of drainage operation based on the expected pH change curve; S43454: Stop the rapid drainage operation at the end of the drainage operation time.

8. A device for dynamic discharge control of pressure limiting in a clear water tank, applied to the method for dynamic discharge control of pressure limiting in a clear water tank as described in any one of claims 1 to 7, characterized in that: Includes inlet pipe (1), acid and alkali detection valve (2), connection and control device (9), pressure valve group, and outlet pipe group; The upper end of the water inlet pipe (1) is connected to the clean water tank, and the lower end of the water inlet pipe (1) is connected to the control device (9). An acid-base detection valve (2) is installed on the water inlet pipe (1) to control the connection between the water inlet pipe (1) and the control device (9). The connection control device (9) is connected to the water pipe in the outlet pipe group through the pressure valve of the pressure valve group.

9. A pressure-limiting dynamic discharge control device for a clear water tank according to claim 8, characterized in that, The water outlet pipe assembly includes a first water outlet pipe (3), a second water outlet pipe (4), and a third water outlet pipe (5); The connection control device (9) is a four-way pipe, which includes a first port, a second port, a third port and a fourth port. The first port is connected to the inlet pipe (1), the second port is connected to the first outlet pipe (3), the third port is connected to the second outlet pipe (4), and the fourth port is connected to the third outlet pipe (5).

10. A pressure-limiting dynamic discharge control device for a clear water tank according to claim 9, characterized in that, The pressure valve group includes a first pressure valve (6), a second pressure valve (7), and a third pressure valve (8). The first pressure valve (6) is located on the side of the first outlet pipe (3) near the connecting control device (9). The second pressure valve (7) is located on the side of the second outlet pipe (4) near the connecting control device (9). The third pressure valve (8) is located on the side of the third outlet pipe (5) near the connecting control device (9). The three pressure valves respectively control the opening and closing of different outlet pipes and the drainage flow.

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