A method and system for dynamic allocation of industrial wastewater buffer volume based on process discharge characteristics
Patent Information
- Application Number
- CN202611205772.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-08-10
- Publication Date
- 2026-10-09
AI Technical Summary
[0006]上述被动运行方式虽然能够满足废水输送的基本要求，但由于各工艺排水支路之间缺少协调控制，在实际运行过程中仍存在以下问题：
本发明是一种基于工艺排放特征的工业废水协同排放控制方法及系统。通过采集各工艺排水支路的排放数据，建立各工艺排水支路的排放特征数据库，并结合废水中转泵房收集水箱液位、提升泵运行状态及预计排放负荷，对各工艺排水支路上的电动阀进行统一调度控制。
Smart Images
Figure CN122883885A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of industrial wastewater treatment technology, and in particular to a method and system for dynamic allocation of industrial wastewater buffer volume based on process discharge characteristics. Background Technology
[0002] Industrial plants typically generate various types of wastewater during production, including concentrated acid wastewater, concentrated alkali wastewater, dilute acid wastewater, dilute alkali wastewater, and ammonia nitrogen wastewater. Currently, different types of wastewater are generally disposed of through separate drainage pipes. Within the workshop, the wastewater is collected by gravity and flows to a wastewater transfer pumping station, where it is then pumped to a wastewater treatment plant for further treatment.
[0003] In wastewater transfer pump stations, separate collection tanks and booster pumps are typically installed for different types of wastewater, with each booster system having at least one operating and one standby pump. The start and stop of the booster pumps are primarily controlled by the liquid level in the collection tank: the booster pump automatically starts when the level reaches the start-up level; and automatically stops when the level drops to the stop-pump level. This control method is simple in structure and is a commonly used operating method in current industrial projects.
[0004] However, each process drainage branch discharges according to its own process operation, and there is no coordinated control between different drainage branches, resulting in a certain degree of randomness in discharge time and flow rate. When multiple drainage branches discharge simultaneously, a large amount of wastewater enters the wastewater transfer pumping station in a short period of time; while under most operating conditions, the drainage branches discharge sporadically, with small amounts of wastewater continuously entering the collection tank.
[0005] The existing wastewater collection system mainly relies on the liquid level of the collection tank to control the start and stop of the booster pump. It basically does not manage the discharge process of each process drainage branch, nor does it coordinate the timing of discharge according to the discharge pattern of each drainage branch and the system operation status. The entire wastewater collection system operates in a passive mode, that is, after the wastewater is discharged into the tank, the booster pump is started or stopped according to the liquid level change.
[0006] While the aforementioned passive operation mode can meet the basic requirements for wastewater transportation, the lack of coordinated control between the various process drainage branches still presents the following problems during actual operation: (1) When multiple process drainage branches discharge simultaneously, wastewater will enter the wastewater transfer pump room in a short period of time, causing the liquid level in the collection tank to rise rapidly. When the instantaneous discharge flow exceeds the pumping capacity, the collection tank may be in a high liquid level state for a long time, and in severe cases, wastewater may even overflow, posing a risk of water accumulation in the pump room.
[0007] (2) Under most production conditions, the discharge from each process drainage branch is relatively dispersed. The booster pump starts running as soon as the water level in the collection tank reaches the start-up level. However, because the amount of wastewater entering the tank is small, the booster pump runs for a short time, and the water level quickly drops to the stop level, at which point the booster pump stops. Subsequently, new wastewater enters, and the water level reaches the start-up level again, causing the booster pump to start again, which easily leads to frequent start-stop of the booster pump. Long-term operation not only increases equipment wear but also affects the operational stability and service life of the booster pump.
[0008] (3) The existing control method only controls the start and stop of the booster pump based on the liquid level of the collection tank. It does not combine the historical discharge patterns, real-time discharge status, expected discharge load and booster pump operation status of each process drainage branch for comprehensive analysis. It cannot coordinate the discharge process of each drainage branch in advance, nor can it reasonably control the opening time of the electric valve of each drainage branch according to the system operation. Summary of the Invention
[0009] Therefore, to address the aforementioned shortcomings, this invention provides a method and system for coordinated industrial wastewater discharge control based on process discharge characteristics. By coordinating and controlling the discharge processes of each process drainage branch, the process of wastewater entering the wastewater transfer pumping station is made more balanced, reducing instantaneous discharge peaks, decreasing the frequency of start-stop cycles of the booster pumps, and improving the operational stability of the wastewater collection system.
[0010] On the one hand, the present invention provides a method for dynamic allocation of industrial wastewater buffer volume based on process discharge characteristics, comprising: Acquire the operating status of each process drainage equipment, the liquid level of each wastewater collection tank, the operating status of the booster pump, and the instantaneous flow rate of each drainage branch; Based on historical emission data, the operating status of each process drainage equipment, and the real-time flow changes of each drainage branch, the emission characteristics of each process drainage branch are analyzed to obtain the expected emission volume, expected emission duration, and expected emission load of each drainage branch within a set future time period. Based on the current liquid level and remaining buffer volume of each wastewater collection tank, the current operating status and discharge capacity of the booster pump, the expected discharge load of each drainage branch, and the waiting time of each drainage branch, determine whether each drainage branch currently meets the discharge conditions, and determine whether simultaneous discharge from multiple drainage branches may cause the wastewater collection tank to reach the preset high liquid level or the remaining buffer volume to fall below the preset minimum safe buffer volume. The judgment results generate a dynamic emission scheduling scheme; Based on the generated dynamic discharge scheduling scheme, the opening, closing, or delayed opening of the corresponding electric valves of each drainage branch is controlled, so that each drainage branch can enter the corresponding wastewater collection tank in the manner of simultaneous discharge, time-sharing discharge, or delayed discharge. The discharge scheduling scheme is dynamically updated according to the changes in the liquid level of the wastewater collection tank and the operating status of the booster pump.
[0011] On the other hand, the present invention also provides a dynamic allocation system for industrial wastewater buffer volume based on process discharge characteristics, used to implement the aforementioned dynamic allocation method for industrial wastewater buffer volume based on process discharge characteristics. The system includes: The acquisition module is used to acquire the operating status of each process drainage equipment, the liquid level of each wastewater collection tank, the operating status of the booster pump, and the instantaneous flow rate of each drainage branch. The analysis module is used to calculate the expected discharge volume, discharge duration, and discharge load of each drainage device within a set future time period based on historical discharge data and the operating status of process equipment. The judgment module is used to determine whether each drainage device meets the discharge conditions based on the remaining volume of each wastewater collection tank, the current operating status of the booster pump, and the expected discharge load. The scheduling module is used to open the corresponding electric valves for equipment that meets the emission conditions, delay the emission of equipment that does not yet meet the emission conditions, and recalculate the emission sequence of each equipment. The control module is used to control the opening and closing of the electric valves of each drainage branch, so that the wastewater enters the booster pump room according to the set rhythm, and the booster pump runs continuously and reduces frequent start and stop.
[0012] The present invention has the following advantages: This invention relates to a method and system for coordinated discharge control of industrial wastewater based on process discharge characteristics. By collecting discharge data from each process drainage branch, a discharge characteristic database for each process drainage branch is established. Combined with the liquid level in the collection tank of the wastewater transfer pump station, the operating status of the booster pump, and the expected discharge load, the electric valves on each process drainage branch are uniformly scheduled and controlled.
[0013] The system rationally controls the opening timing of the electric valves of each process drainage branch based on the calculation results, so that the wastewater entering the wastewater transfer pump room from each drainage branch is more balanced. Under the premise of not affecting the normal production and normal discharge of the process, it reduces the instantaneous flow impact caused by the simultaneous discharge of multiple drainage branches, extends the single continuous operation time of the booster pump, reduces the number of frequent start-stops of the booster pump, reduces the risk of high liquid level operation in the wastewater transfer pump room, and improves the stability of the entire wastewater collection system. Attached Figure Description
[0014] Figure 1 This is a flowchart of the method for dynamic allocation of industrial wastewater buffer volume based on process discharge characteristics according to the present invention. Figure 2 This is a schematic diagram of the module composition of the system of the present invention; Figure 3 This is a schematic diagram of the hardware architecture of the system of the present invention; Figure 4 This is a schematic diagram of the pipeline connection and control logic of the system of the present invention. Detailed Implementation
[0015] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.
[0016] In this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, without necessarily requiring or implying any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.
[0017] As described in the background section, although the existing passive operation mode can meet the basic requirements of wastewater transportation, the lack of coordinated control between the various process drainage branches still leads to the following problems in actual operation: (1) When multiple process drainage branches discharge simultaneously, wastewater will enter the wastewater transfer pump room in a short period of time, causing the liquid level in the collection tank to rise rapidly. When the instantaneous discharge flow exceeds the pumping capacity, the collection tank may be in a high liquid level state for a long time, and in severe cases, wastewater may even overflow, posing a risk of water accumulation in the pump room.
[0018] (2) Under most production conditions, the discharge from each process drainage branch is relatively dispersed. The booster pump starts running as soon as the water level in the collection tank reaches the start-up level. However, because the amount of wastewater entering the tank is small, the booster pump runs for a short time, and the water level quickly drops to the stop level, at which point the booster pump stops. Subsequently, new wastewater enters, and the water level reaches the start-up level again, causing the booster pump to start again, which easily leads to frequent start-stop of the booster pump. Long-term operation not only increases equipment wear but also affects the operational stability and service life of the booster pump.
[0019] (3) The existing control method only controls the start and stop of the booster pump based on the liquid level of the collection tank. It does not combine the historical discharge patterns, real-time discharge status, expected discharge load and booster pump operation status of each process drainage branch for comprehensive analysis. It cannot coordinate the discharge process of each drainage branch in advance, nor can it reasonably control the opening time of the electric valve of each drainage branch according to the system operation.
[0020] For the reasons mentioned above, this embodiment provides a method for dynamically allocating industrial wastewater buffer volume based on process discharge characteristics, such as... Figure 1 As shown, it includes the following steps: S101: Data Acquisition; The system acquires operational status information for each process drainage branch, and simultaneously collects data on the liquid level of each wastewater collection tank, the operational status of the booster pump, and the flow rate of each drainage branch.
[0021] Each process drainage branch includes concentrated acid wastewater branch, concentrated alkali wastewater branch, dilute acid wastewater branch, dilute alkali wastewater branch, and ammonia nitrogen wastewater branch, etc.
[0022] Each drainage branch is equipped with a flow meter and an electric valve, and the wastewater transfer pump room is equipped with a level gauge and a booster pump operation status feedback device.
[0023] S102: Emissions Characteristic Analysis; Statistical analysis of historical operating data was conducted to establish a database of discharge characteristics for each process drainage branch.
[0024] The database mainly records: single emission amount, emission duration, emission frequency, emission cycle, emission start time, and emission end time.
[0025] Based on real-time operating status and historical emission patterns, the emission load for a future set time period is calculated.
[0026] When conducting emission characteristic analysis, basic network parameters such as pipe diameter, pipe length, pipe slope, and pipe material roughness coefficient of each process drainage branch and main drainage pipe are obtained, and the design fullness of each drainage pipe section is preset. The design fullness is predetermined according to the design requirements of the drainage pipeline and is used to calculate the maximum allowable drainage flow rate of each drainage pipe section.
[0027] For pipe sections using gravity flow drainage, the maximum allowable drainage flow rate under the preset design fill degree condition is calculated based on parameters such as pipe diameter, pipe slope, pipe material roughness coefficient, and preset design fill degree. The maximum allowable drainage flow rate can be calculated using the Manning formula, as follows: ; In the formula, Q maxis the maximum allowable drainage flow rate of the drainage pipe section under the preset design fullness condition; n is the Manning roughness coefficient corresponding to the pipe material; A is the cross-sectional area of the water passage determined according to the pipe diameter and the preset design fullness; R is the hydraulic radius determined according to the pipe diameter and the preset design fullness; I is the hydraulic slope of the pipe.
[0028] The preset design fullness is a pre-set design parameter, not the actual pipe fullness obtained through online detection. Based on the pipe diameter and preset design fullness of each drainage pipe section, the corresponding cross-sectional area and hydraulic radius are determined, thereby calculating the maximum allowable drainage flow rate for each drainage pipe section.
[0029] Further, the actual discharge flow of each drainage branch and main drainage pipe is obtained in real time, and the real-time discharge flow is compared with the maximum allowable discharge flow of the corresponding pipe section to obtain the flow load rate of each pipe section. The calculation method is as follows: ; In the formula, η i Let Q be the flow load rate of the i-th drainage pipe segment; i，real Q represents the real-time discharge flow rate of the i-th drainage pipe segment; i，max The maximum allowable drainage flow rate is calculated for the i-th drainage pipe segment based on the preset design fullness.
[0030] Based on the real-time discharge flow rate, historical discharge characteristic parameters, and flow load rate of each drainage pipe section, the expected discharge load of each process drainage branch within a future set time period is predicted. For process drainage branches with periodic or regular discharge characteristics, the possible future discharge time and expected discharge volume are determined based on historical discharge cycles, discharge frequency, single discharge volume, and discharge duration. For drainage branches currently discharging, the remaining duration and expected remaining discharge volume are predicted based on the current real-time discharge flow rate, the current continuous discharge time, and historical discharge duration characteristics.
[0031] Furthermore, based on the pipe lengths between each process drainage branch and the wastewater transfer pumping station or wastewater collection tank, and the average pipe velocity calculated from the real-time discharge flow rate, the estimated transport time required for the discharged water to travel from the corresponding drainage branch to the wastewater transfer pumping station or wastewater collection tank is calculated. The calculation method is as follows: ; In the formula, t i L represents the estimated transport time of the water flow discharged from the i-th drainage branch; i V is the effective transport length of the pipeline from the i-th drainage branch to the wastewater transfer pumping station or wastewater collection tank; i The average flow velocity is calculated based on the real-time discharge flow rate and the corresponding cross-sectional area of the i-th drainage pipe segment.
[0032] When multiple drainage branches converge into the same main drainage pipe, the discharge volume of each branch is calculated by time-staggered superposition based on the expected discharge time, expected discharge volume, and expected arrival time of the corresponding discharge flow of each branch, so as to obtain the expected discharge flow and discharge load of each main drainage pipe in the future set time period.
[0033] For cases where different types of wastewater are set up with independent drainage pipe networks, the above-mentioned discharge load prediction calculations are performed for each type of wastewater pipe network. For cases where multiple drainage branches converge into the same main drainage pipe, the discharge load of each branch is superimposed based on the expected time and expected discharge flow of the water discharged from each branch to reach the main pipe confluence node, thereby obtaining the expected discharge load and its time distribution of each type of wastewater entering the corresponding wastewater transfer pumping station or wastewater collection tank in the future set time period.
[0034] For example, based on historical emission characteristic data and real-time operational data in the operating parameter database, the predicted discharge volumes of various wastewater types within the next 5 minutes are as follows: concentrated acid wastewater 12 m³, concentrated alkali wastewater 6 m³, dilute acid wastewater 9 m³, and ammonia nitrogen wastewater 3 m³. Further, based on the pipe diameter, pipe slope, pipe material, pre-designed fill level, and real-time discharge flow rate of the corresponding drainage pipe network for each type of wastewater, the maximum allowable drainage flow rate and flow load rate of each drainage pipe section are calculated. The estimated arrival time of the discharged water at the wastewater transfer pumping station or wastewater collection tank is calculated based on the pipe length and real-time discharge flow rate of each drainage branch. Combining the estimated discharge time and estimated arrival time of each drainage branch, the discharge load of each branch is calculated by time-staggered superposition, thereby obtaining the estimated discharge load and its time distribution of various wastewater types actually entering the wastewater transfer pumping station or wastewater collection tank within a future set time period. This provides data basis for the dynamic allocation of buffer volumes and discharge scheduling of each wastewater collection tank in the subsequent wastewater transfer pumping station.
[0035] S103: Emission condition assessment; Based on the real-time buffer volume of the wastewater collection tank, the operating status of the booster pump, and the expected discharge load, the discharge conditions of each process drainage branch are determined.
[0036] First, based on the effective volume of the wastewater collection tank, the current liquid level, or the current remaining buffer volume, determine the current available buffer volume of the wastewater collection tank. Then, based on the expected discharge volume and expected discharge time of each process drainage branch obtained in S102, calculate the expected remaining buffer volume of the wastewater collection tank after the discharge of each process drainage branch.
[0037] For the i-th wastewater collection tank, its expected remaining buffer volume can be calculated as follows: V i,remain =V i,current +Vi,in -V i,out In the formula, V i,remain To set the expected remaining buffer volume of the i-th wastewater collection tank at the end of the prediction period; V i,current V represents the remaining buffer volume of the current wastewater collection tank. i,in To predict the amount of wastewater expected to enter the wastewater collection tank within a given time period; V i,out To predict the amount of wastewater that the booster pump is expected to discharge within a given time period.
[0038] The volume of wastewater expected to enter the wastewater collection tank during the forecast period is determined based on the expected discharge volume of each process drainage branch and its expected arrival time calculated in S102; the volume of wastewater expected to be discharged by the booster pump is determined based on the booster pump's rated flow rate, current operating status, and expected operating time during the forecast period.
[0039] When the booster pump is running, the expected drainage volume within the predicted time period is calculated based on the current actual operating flow rate or rated discharge flow rate of the booster pump. When the booster pump is stopped, it is determined whether the booster pump can start running within the predicted time period based on the booster pump start-up conditions and preset control logic, and the expected drainage volume within the predicted time period is determined accordingly.
[0040] Subsequently, the estimated remaining buffer volume of the wastewater collection tank is compared with the preset minimum safe buffer volume, and the corresponding discharge branch is judged to meet the discharge conditions based on the estimated discharge volume of each process drainage branch.
[0041] Specifically, the corresponding process drainage branch is deemed to meet the discharge conditions when the following conditions are met: (1) The wastewater collection tank corresponding to the process drainage branch shall have a remaining buffer volume of not less than the preset minimum safety buffer volume after receiving the expected wastewater discharge. (2) The expected liquid level of the corresponding wastewater collection tank shall not exceed the preset high liquid level control value; (3) The booster pump is in normal operation, or can be started before the expected wastewater arrives according to the preset control conditions; (4) Within the set prediction time period, the difference between the expected amount of wastewater entering the wastewater collection tank and the expected discharge amount of the booster pump shall not cause the wastewater collection tank to exceed the preset maximum allowable storage volume. (5) When multiple process drainage branches discharge simultaneously within the same time period, the total discharge load after the sum of the expected discharge volumes of each branch does not cause the expected liquid level of the corresponding wastewater collection tank to exceed the preset high liquid level control value.
[0042] When all the above conditions are met, the corresponding process drainage branch is deemed to meet the discharge conditions, and the process drainage branch is allowed to discharge in a normal discharge state.
[0043] When the expected discharge from one or more process drainage branches will cause the remaining buffer volume of the wastewater collection tank to fall below the preset minimum safe buffer volume, or when the expected liquid level reaches or exceeds the preset high liquid level control value, the current discharge conditions are deemed insufficient, and the discharge tasks are sorted according to the discharge priority of each process drainage branch.
[0044] The discharge priority is determined based on one or more of the following factors: wastewater type, expected discharge volume, expected discharge duration, current level of wastewater collection tank, remaining buffer volume of wastewater collection tank, and waiting time of each process drainage branch.
[0045] For drainage branches that are expected to cause wastewater collection tanks to exceed their maximum allowable storage capacity after discharge, discharge from such drainage branches will be temporarily suspended. In the case of multiple drainage branches applying for discharge at the same time, the drainage branch with the higher priority will be given priority for discharge, and the drainage branch with the lower priority will be temporarily suspended.
[0046] When a drainage branch is temporarily suspended, the wastewater collection tank level, remaining buffer volume, and booster pump operation status are continuously monitored. When the wastewater collection tank returns to a state that meets the discharge conditions after being discharged by the booster pump, the discharge conditions of the temporarily suspended drainage branch are reassessed, and drainage branches that meet the conditions are allowed to resume discharge.
[0047] For drainage branches that have reached the preset maximum allowable waiting time, their discharge priority is increased and the discharge conditions are reassessed to avoid the drainage branches affecting the normal operation of the corresponding process equipment due to continuous waiting.
[0048] Using the above method, based on the real-time buffering capacity of the wastewater collection tank, the expected wastewater inflow, and the expected discharge capacity of the booster pump, the liquid level change trend of the wastewater collection tank within a future set time period is predicted. The discharge condition is determined based on the wastewater collection tank not exceeding the preset maximum allowable storage volume and retaining the preset safety buffer volume at the end of the predicted time period. This determines whether each process drainage branch is allowed to discharge, and dynamically adjusts the discharge sequence when multiple drainage branches discharge simultaneously.
[0049] S104: Emission scheduling control; Based on the discharge condition judgment results of S103, combined with the expected discharge volume, expected discharge time, current waiting time and real-time buffer volume of the corresponding wastewater collection tank of each process drainage branch, a dynamic discharge scheduling scheme is generated, and the discharge timing of each process drainage branch is controlled according to the dynamic discharge scheduling scheme.
[0050] For process drainage branches that meet the discharge conditions, the corresponding electric valve is opened to allow the process drainage branch to discharge; for process drainage branches that do not currently meet the discharge conditions, the corresponding electric valve is kept closed to temporarily suspend the discharge of the process drainage branch, and the liquid level, remaining buffer volume, and operating status of the corresponding wastewater collection tank and booster pump are continuously monitored.
[0051] The dynamic discharge scheduling scheme includes one or more of the following: discharge priority, allowable discharge time, and deferred discharge time for each process drainage branch. The scheme is constrained by the predicted buffering capacity of the wastewater collection tank, and uses the expected discharge volume, expected discharge time, current waiting time, and the current operating status and expected discharge capacity of the booster pumps for each process drainage branch as the scheduling basis to dynamically determine the discharge priority and timing for each process drainage branch.
[0052] Specifically, based on the expected discharge volume and expected discharge time of each process drainage branch obtained in S102, and combined with the current remaining buffer volume of the wastewater collection tank calculated in S103 and the expected discharge volume of the booster pump within the predicted time period, the expected remaining buffer volume of the wastewater collection tank corresponding to different drainage branch discharge combinations is calculated, and it is determined whether different discharge combinations meet the preset safety buffer conditions.
[0053] When multiple process drainage branches generate discharge demand simultaneously within the same time period, and opening multiple drainage branches at the same time will not cause the expected liquid level of the wastewater collection tank to exceed the preset high liquid level control value, and the expected remaining buffer volume is not lower than the preset minimum safe buffer volume, multiple drainage branches are allowed to discharge simultaneously, and the corresponding electric valves are controlled to open simultaneously.
[0054] When opening multiple process drainage branches simultaneously would cause the expected remaining buffer volume of the wastewater collection tank to fall below the preset minimum safe buffer volume, or when the expected liquid level reaches or exceeds the preset high liquid level control value, instead of opening all drainage branches at the same time, the drainage branches are dynamically sorted according to the expected discharge volume of each drainage branch, the current waiting time, and the expected discharge capacity of the booster pump to determine the drainage branches that are currently allowed to discharge and the drainage branches that are temporarily suspended from discharge.
[0055] In one implementation, drainage branches with smaller expected discharge volumes and longer current waiting times can be prioritized for discharge; for drainage branches with larger expected discharge volumes and shorter current waiting times, their discharge is temporarily suspended. When the waiting time of a certain drainage branch reaches the preset maximum allowable waiting time, the discharge priority of that drainage branch is increased, and the remaining buffer volume of the current wastewater collection tank and the expected discharge capacity of the booster pump are recalculated. If the discharge conditions are met, that drainage branch is prioritized for discharge.
[0056] Meanwhile, the discharge scheduling plan is dynamically adjusted based on the operating status of the booster pumps. When the booster pumps are running and the expected discharge capacity is greater than the current and predicted wastewater inflow, the number of drainage branches that can discharge simultaneously is increased based on the available buffer volume of the wastewater collection tank. When the booster pumps are stopped, or when the expected discharge capacity of the booster pumps is less than the current and predicted wastewater inflow, the number of drainage branches that can be opened simultaneously is reduced, and high-priority drainage branches are prioritized for discharge based on discharge priority.
[0057] For example, when concentrated acid wastewater discharge branches, concentrated alkali wastewater discharge branches, and dilute acid wastewater discharge branches all generate discharge demands simultaneously within the same time period, the expected discharge volume of each discharge branch within a set time period is predicted according to S102, and calculated in conjunction with the current remaining buffer volume of the corresponding wastewater collection tank and the expected discharge capacity of the booster pump. If the prediction result indicates that simultaneous discharge from the three discharge branches will not cause the wastewater collection tank to exceed the preset maximum allowable storage volume, and the preset minimum safety buffer volume can be maintained, the electric valves corresponding to the three discharge branches will be opened simultaneously. If the prediction result indicates that simultaneous discharge from the three discharge branches will cause the wastewater collection tank to exceed the preset maximum allowable storage volume or will not be able to maintain the preset minimum safety buffer volume, the discharge priority is determined according to the expected discharge volume and waiting time of each discharge branch. The discharge branches that meet the current discharge conditions and have higher discharge priority are opened first, while the discharge from other discharge branches is temporarily suspended.
[0058] For drainage branches with temporarily suspended discharge, continuously monitor the wastewater collection tank level, remaining buffer volume, booster pump operating status, and drainage branch waiting time. When the booster pump operation increases the remaining buffer volume of the wastewater collection tank, or when the discharged branch completes discharge, restoring usable buffer space in the wastewater collection tank, re-execute the discharge condition judgment in S103 and regenerate the dynamic discharge scheduling plan based on the updated judgment result. When the temporarily suspended drainage branch meets the discharge conditions, control the corresponding electric valve to open, allowing the drainage branch to resume discharge.
[0059] The above method does not open the drainage branches in a fixed, predetermined order. Instead, it uses the predicted buffering capacity of the wastewater collection tank as a constraint. Based on the expected discharge volume, expected discharge time, current waiting time, and the current operating status and expected discharge capacity of the booster pump, the timing and sequence of discharge of each drainage branch are dynamically coordinated and controlled. This ensures that the wastewater collection tank maintains its preset safe buffer volume while rationally arranging the discharge sequence of each process drainage branch, avoiding the simultaneous discharge of multiple drainage branches that could cause the wastewater collection tank to operate at high load or high liquid level for a short period of time.
[0060] The aforementioned dynamic discharge scheduling process can dynamically allocate the limited wastewater collection buffer volume among different drainage branches by coordinating the time when different drainage branches enter the wastewater collection tank, without changing the actual wastewater volume generated by each process drainage branch, thereby improving the adaptability of wastewater collection to intermittent and fluctuating drainage loads.
[0061] S105: Co-emissions operation; Based on the dynamic emission scheduling scheme generated in S104, the electric valves corresponding to each process drainage branch are controlled to perform opening, closing, or delayed opening actions, thereby coordinating the emission timing among multiple process drainage branches.
[0062] The coordinated discharge refers to: using the remaining buffer volume of the wastewater collection tank and the discharge capacity of the booster pump as constraints, and based on the expected discharge volume, expected discharge time, current waiting time, and whether the current discharge conditions of each process drainage branch are met, the discharge timing of multiple drainage branches is dynamically coordinated so that the wastewater from different drainage branches enters the corresponding wastewater collection tank at different times or simultaneously according to the dynamic discharge scheduling plan, thereby avoiding the wastewater collection tank from entering a high liquid level state in a short period of time due to concentrated discharge from multiple drainage branches.
[0063] The dynamic emission scheduling scheme is the emission scheduling result generated in S104, including one or more of the following: emission priority, allowable emission time, and temporary emission suspension time for each drainage branch. The operation status of the electric valves in each drainage branch is controlled according to the dynamic emission scheduling scheme.
[0064] When multiple drainage branches generate discharge demand simultaneously within the same time period, a comprehensive judgment is made based on the expected discharge volume of each drainage branch, the current waiting time, the remaining buffer volume of the wastewater collection tank, and the current operating status and expected discharge capacity of the booster pump.
[0065] When multiple drainage branches discharge simultaneously, if the wastewater collection tank level is not expected to exceed the preset high level control value and the remaining buffer volume is not expected to be lower than the preset minimum safe buffer volume, the electric valves corresponding to the multiple drainage branches will be opened simultaneously, allowing multiple drainage branches to discharge at the same time.
[0066] When multiple drainage branches discharge simultaneously, which would cause the expected wastewater collection tank level to reach or exceed the preset high level control value, or when the expected remaining buffer volume is lower than the preset minimum safe buffer volume, the drainage branches that are given priority for discharge and the drainage branches that are temporarily suspended from discharge are determined according to the dynamic discharge scheduling scheme.
[0067] Among them, the priority discharge branch refers to the drainage branch that meets the discharge conditions and is arranged to discharge first according to the preset discharge priority, under the current remaining buffer volume of the wastewater collection tank and the discharge capacity of the booster pump. The discharge priority can be determined based on one or more of the following: expected discharge volume, current waiting time, and maximum allowable waiting time.
[0068] In one implementation, when multiple drainage branches simultaneously meet the discharge conditions, but their expected simultaneous discharge volume exceeds the currently available buffer volume of the wastewater collection tank, the drainage branch with the smaller expected discharge volume and longer current waiting time is given priority for discharge, while the drainage branch with the larger expected discharge volume and shorter current waiting time is temporarily suspended. When the waiting time of the suspended drainage branch reaches the preset maximum allowable waiting time, the discharge priority of that drainage branch is increased, and the discharge condition judgment is re-executed. After the discharge conditions are met, it is arranged to discharge.
[0069] The discharge rhythm refers to the time relationship between various drainage branches determined according to the dynamic discharge scheduling scheme, including one or more of simultaneous discharge, time-sharing discharge, and delayed discharge. Among them, time-sharing discharge means that during or after the discharge of the previous drainage branch, after a preset time interval or after the wastewater collection tank has recovered the preset available buffer volume, the electric valve corresponding to the next drainage branch is opened; delayed discharge means that after the drainage branch generates a discharge demand, the corresponding electric valve is not opened immediately, but the electric valve is opened to discharge after the preset discharge conditions are met.
[0070] During the coordinated discharge process, the wastewater collection tank level, remaining buffer volume, booster pump operating status, and discharge status of each drainage branch are continuously monitored. When a drainage branch that has been opened for discharge completes its discharge, or when the booster pump operation increases the remaining buffer volume of the wastewater collection tank, the discharge condition judgment in S103 is re-executed based on the updated operating parameters, and the dynamic discharge scheduling scheme in S104 is updated based on the judgment result to further control the opening of drainage branches that have temporarily suspended discharge.
[0071] By using the above-mentioned coordinated discharge control method, under the condition that the amount of wastewater generated remains unchanged, the discharge load of multiple drainage branches is matched with the buffer capacity of the wastewater collection tank and the discharge capacity of the booster pump by coordinating the time when each drainage branch enters the wastewater collection tank. This reduces the instantaneous discharge load caused by the simultaneous centralized discharge of multiple drainage branches, improves the utilization rate of the effective buffer volume of the wastewater collection tank, and enables the booster pump to maintain a relatively continuous discharge operation when the operating conditions are met, thereby reducing the frequent start-stop of the booster pump caused by the instantaneous centralized entry of wastewater.
[0072] In another embodiment, such as Figure 2As shown, a dynamic allocation system for industrial wastewater buffer volume based on process discharge characteristics is also provided to implement the above-mentioned dynamic allocation method for industrial wastewater buffer volume based on process discharge characteristics. The system includes: The acquisition module 21 is used to acquire operating parameters such as the operating status of each process drainage equipment, the liquid level of each wastewater collection tank, the operating status of the booster pump, and the instantaneous flow rate of each drainage branch.
[0073] Analysis module 22 is used to analyze the emission characteristics of each process drainage branch based on historical emission data, the operating status of each process drainage equipment and the real-time flow changes of each drainage branch, and to obtain the expected emission amount, expected emission duration and expected emission load of each drainage branch within a set future time.
[0074] The judgment module 23 is used to determine whether each drainage branch meets the discharge conditions based on the current liquid level and remaining buffer volume of each wastewater collection tank, the current operating status and discharge capacity of the booster pump, the expected discharge load of each drainage branch and the waiting time of each drainage branch, and to determine whether the simultaneous discharge of multiple drainage branches may cause the wastewater collection tank to reach the preset high liquid level or the remaining buffer volume to be lower than the preset minimum safe buffer volume.
[0075] The scheduling module 24 is used to generate a dynamic discharge scheduling scheme based on the judgment result of the judgment module 23. When multiple drainage branches meet the discharge conditions and simultaneous discharge will not cause the wastewater collection tank to exceed the preset buffer volume, it is determined that multiple drainage branches will discharge simultaneously. When simultaneous discharge of multiple drainage branches may cause the wastewater collection tank to reach the preset high liquid level or the remaining buffer volume to be insufficient, the discharge priority is determined based on the expected discharge volume of each drainage branch, the current waiting time, and the maximum allowable waiting time. Priority discharge branches and delayed discharge branches are determined, and a dynamic discharge scheduling scheme including discharge priority, allowable discharge time, and delayed discharge time is generated.
[0076] The control module 25 is used to control the opening, closing or delayed opening of the electric valves corresponding to each drainage branch according to the dynamic discharge scheduling scheme generated by the scheduling module 24, so that each drainage branch enters the corresponding wastewater collection tank in the manner of simultaneous discharge, time-sharing discharge or delayed discharge, and dynamically updates the discharge scheduling scheme according to the changes in the liquid level of the wastewater collection tank and the operating status of the booster pump.
[0077] like Figure 3As shown, the controller 310 in the system is connected via a communication bus 340 to the liquid level acquisition module, the flow acquisition module, the equipment operation status acquisition module, the electric valve control unit 320, and the lift pump control interface 330. The liquid level acquisition module acquires the real-time liquid level of the wastewater collection tank; the flow acquisition module acquires the instantaneous flow rate of each drainage branch; and the equipment operation status acquisition module acquires the operating status of each process drainage device. The electric valve control unit 320 is connected to electric valves 1, 2, ..., n of each drainage branch and controls the discharge status of each drainage branch according to control commands sent by the controller 310. The lift pump control interface 330 is connected to the lift pump and acquires the lift pump's operating status and sends corresponding control commands to the lift pump.
[0078] like Figure 4 As shown, multiple process drainage devices A, B, C, and D are connected to a wastewater collection tank via corresponding drainage branches. Each drainage branch is equipped with electric valves A, B, C, and D. The controller determines the current discharge demand and conditions of each drainage branch based on the operating status of each process drainage device, the instantaneous flow rate of each drainage branch, and the real-time liquid level of the wastewater collection tank. It then coordinates the discharge timing of each drainage branch by controlling the opening status of each electric valve.
[0079] For example, when devices A, B, C, and D simultaneously generate discharge requirements, controller 310 first obtains the current liquid level of the wastewater collection tank and calculates the remaining buffer volume of the wastewater collection tank based on the current liquid level; at the same time, it obtains the current operating status and discharge capacity of the booster pump, and calculates the expected liquid level change of the wastewater collection tank after simultaneously opening electric valves A, B, C, and D, in conjunction with the expected discharge volume of each drainage branch.
[0080] When it is calculated that the wastewater collection tank level will not reach the preset high level control value after all electric valves are opened simultaneously, and the remaining buffer volume is not lower than the preset minimum safe buffer volume, the controller controls the corresponding electric valves to open simultaneously, so that the wastewater generated by equipment A, equipment B, equipment C and equipment D enters the wastewater collection tank at the same time.
[0081] When calculations indicate that simultaneously opening multiple electric valves may cause the wastewater collection tank level to reach or exceed a preset high-level control value, or that the remaining buffer volume is expected to be lower than a preset minimum safe buffer volume, the controller determines the discharge priority based on the expected discharge volume of each drainage branch, the current waiting time, and the maximum allowable waiting time. For example, the controller may prioritize opening the electric valves corresponding to drainage branches with longer current waiting times and smaller expected discharge volumes, while temporarily delaying the opening of electric valves corresponding to drainage branches with larger expected discharge volumes and shorter current waiting times, in order to reduce the instantaneous discharge load caused by a short-term concentration of wastewater entering the wastewater collection tank.
[0082] Once the opened drainage branch has completed its discharge, or the booster pump has caused the wastewater collection tank level to drop and the remaining buffer volume to increase, the controller re-acquires the wastewater collection tank level, the booster pump's operating status, and the real-time flow rate of each drainage branch, and re-determines whether the temporarily deferred drainage branch meets the discharge conditions. When the temporarily deferred drainage branch meets the discharge conditions, the controller opens the corresponding electric valve, initiating the discharge process.
[0083] During the above process, the controller 310 acquires the real-time liquid level of the wastewater collection tank through the liquid level acquisition module, the instantaneous flow rate of each drainage branch through the flow acquisition module, and the operating status of each process drainage device through the equipment operation status acquisition module. Based on these real-time operating parameters, the controller dynamically adjusts the opening status of each electric valve. When the wastewater collection tank level is high and the booster pump is stopped, the controller can temporarily suspend the discharge from some drainage branches. When the booster pump starts running and the remaining buffer volume of the wastewater collection tank increases, the controller can rearrange the temporarily suspended drainage branches for discharge based on the updated operating parameters.
[0084] Through the above control method, the drainage branches do not discharge in a fixed order. Instead, the discharge timing of each drainage branch is dynamically coordinated based on the real-time buffer volume of the wastewater collection tank, the operating status and discharge capacity of the booster pump, the expected discharge load of each drainage branch, and the waiting time of the drainage branch. This ensures that the instantaneous discharge load of wastewater entering the wastewater collection tank matches the buffer capacity of the wastewater collection tank and the discharge capacity of the booster pump. While ensuring the normal discharge requirements of each process drainage equipment, this reduces the risk of high liquid level in the tank caused by concentrated discharge from multiple drainage branches and reduces the frequent start-stop of the booster pump caused by fluctuations in instantaneous discharge load.
[0085] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A method for dynamically allocating the buffer volume of industrial wastewater based on process discharge characteristics, characterized in that, include: Acquire the operating status of each process drainage equipment, the liquid level of each wastewater collection tank, the operating status of the booster pump, and the instantaneous flow rate of each drainage branch; Based on historical emission data, the operating status of each process drainage equipment, and the real-time flow changes of each drainage branch, the emission characteristics of each process drainage branch are analyzed to obtain the expected emission volume, expected emission duration, and expected emission load of each drainage branch within a set future time period. Based on the current liquid level and remaining buffer volume of each wastewater collection tank, the current operating status and discharge capacity of the booster pump, the expected discharge load of each drainage branch, and the waiting time of each drainage branch, determine whether each drainage branch currently meets the discharge conditions, and determine whether simultaneous discharge from multiple drainage branches may cause the wastewater collection tank to reach the preset high liquid level or the remaining buffer volume to fall below the preset minimum safe buffer volume. The judgment results generate a dynamic emission scheduling scheme; Based on the generated dynamic discharge scheduling scheme, the opening, closing, or delayed opening of the corresponding electric valves of each drainage branch is controlled, so that each drainage branch can enter the corresponding wastewater collection tank in the manner of simultaneous discharge, time-sharing discharge, or delayed discharge. The discharge scheduling scheme is dynamically updated according to the changes in the liquid level of the wastewater collection tank and the operating status of the booster pump.
2. The method for dynamic allocation of industrial wastewater buffer volume based on process discharge characteristics according to claim 1, characterized in that, The analysis of emission characteristics includes: Obtain the pipe diameter, pipe length, pipe slope, pipe material roughness coefficient, and preset design fill degree of each process drainage branch and drainage main; Based on the pipe diameter, pipe slope, pipe material roughness coefficient and preset design fullness, calculate the maximum allowable drainage flow rate of the corresponding pipe section under the preset design fullness condition; The actual discharge flow rate of each drainage branch and main drainage pipe is acquired in real time, and the actual discharge flow rate is compared with the maximum allowable discharge flow rate of the corresponding pipe section to obtain the flow load rate of each pipe section; and Based on the real-time discharge flow rate, historical discharge characteristic parameters, and flow load rate of each drainage branch, the expected discharge load of each process drainage branch within a set future time period is predicted.
3. The method for dynamic allocation of industrial wastewater buffer volume based on process discharge characteristics according to claim 2, characterized in that, The analysis of emission characteristics also includes: Based on the pipe length between each process drainage branch and the wastewater transfer pumping station or wastewater collection tank, and the average pipe velocity calculated based on the real-time discharge flow rate, calculate the estimated transport time required for the discharged water to be transported from the corresponding drainage branch to the wastewater transfer pumping station or wastewater collection tank. When multiple drainage branches converge into the same main drainage pipe, the discharge volume of each branch is calculated by time-staggered superposition based on the expected discharge time, expected discharge volume, and expected arrival time of the corresponding discharge flow of each branch, so as to obtain the expected discharge flow and discharge load of each main drainage pipe in the future set time period.
4. The method for dynamic allocation of industrial wastewater buffer volume based on process discharge characteristics according to claim 2, characterized in that, The corresponding process drainage branch is deemed to meet the discharge requirements when all of the following conditions are met: After receiving the expected wastewater discharge, the wastewater collection tank corresponding to the process drainage branch should have a remaining buffer volume that is not less than the preset minimum safety buffer volume. The expected liquid level in the corresponding wastewater collection tank shall not exceed the preset high liquid level control value; The booster pump is in normal operating condition, or can be started and operated before the expected wastewater arrives according to preset control conditions; Within the set forecast period, the difference between the expected wastewater volume entering the wastewater collection tank and the expected discharge volume of the booster pump should not cause the wastewater collection tank to exceed the preset maximum allowable storage volume. as well as When multiple process drainage branches discharge simultaneously within the same time period, the total discharge load after the sum of the expected discharge volumes of each branch will not cause the expected liquid level of the corresponding wastewater collection tank to exceed the preset high liquid level control value.
5. The method for dynamic allocation of industrial wastewater buffer volume based on process discharge characteristics according to claim 2, characterized in that, The emission condition determination step also includes: When the expected remaining buffer volume of the wastewater collection tank is lower than the preset minimum safe buffer volume after discharge from one or more process drainage branches, or when the expected liquid level reaches or exceeds the preset high liquid level control value, it is determined that the current discharge conditions are insufficient. The discharge tasks are sorted according to the discharge priority of each process drainage branch, and the discharge of the drainage branch with the higher discharge priority is allowed first, while the discharge of the drainage branch with the lower discharge priority is temporarily suspended. The discharge priority is determined based on one or more of the following factors: wastewater type, expected discharge volume, expected discharge duration, current liquid level in the wastewater collection tank, remaining buffer volume in the wastewater collection tank, and waiting time for each process drainage branch. When a drainage branch is temporarily suspended, the level of the wastewater collection tank, the remaining buffer volume, and the operating status of the booster pump are continuously monitored. When the wastewater collection tank returns to a state that meets the discharge conditions after being discharged by the booster pump, the discharge conditions of the temporarily suspended drainage branch are reassessed, and the drainage branch that meets the conditions is allowed to resume discharge. For drainage branches that have reached the preset maximum allowable waiting time, their discharge priority is increased, and the discharge conditions are reassessed.
6. The method for dynamic allocation of industrial wastewater buffer volume based on process discharge characteristics according to claim 1, characterized in that, The dynamic emission scheduling scheme generated from the judgment result includes: Based on the estimated discharge volume, estimated discharge time, current waiting time, and the current operating status and estimated discharge capacity of the booster pump, calculate the estimated remaining buffer volume of the wastewater collection tank corresponding to different discharge combinations of drainage branches, and determine whether different discharge combinations meet the preset safety buffer conditions. When multiple process drainage branches generate discharge demand at the same time, and opening multiple drainage branches at the same time will not cause the expected liquid level of the wastewater collection tank to exceed the preset high liquid level control value, and the expected remaining buffer volume is not lower than the preset minimum safe buffer volume, multiple drainage branches are allowed to discharge at the same time. When opening multiple process drainage branches simultaneously will cause the expected remaining buffer volume of the wastewater collection tank to fall below the preset minimum safe buffer volume, or when the expected liquid level reaches or exceeds the preset high liquid level control value, the drainage branches are dynamically sorted according to the expected discharge volume of each drainage branch, the current waiting time, and the expected discharge capacity of the booster pump to determine the drainage branches that are currently allowed to discharge and the drainage branches that are temporarily suspended from discharge.
7. The method for dynamic allocation of industrial wastewater buffer volume based on process discharge characteristics according to claim 6, characterized in that, The dynamic emission scheduling scheme generated from the judgment result also includes: Prioritize discharge from drainage branches with smaller expected discharge volumes and longer current waiting times, and temporarily suspend discharge from drainage branches with larger expected discharge volumes and shorter current waiting times. When the waiting time of a certain drainage branch reaches the preset maximum allowable waiting time, the discharge priority of that drainage branch is increased, and the remaining buffer volume of the current wastewater collection tank and the expected discharge capacity of the booster pump are recalculated. If the discharge conditions are met, that drainage branch is given priority for discharge; and The discharge scheduling plan is dynamically adjusted based on the operating status of the booster pump: when the booster pump is running and the expected discharge capacity is greater than the wastewater inflow during the current and predicted time period, the number of drainage branches that can discharge simultaneously is increased; when the booster pump is stopped, or the expected discharge capacity of the booster pump is less than the wastewater inflow during the current and predicted time period, the number of drainage branches that can be opened simultaneously is reduced.
8. The method for dynamic allocation of industrial wastewater buffer volume based on process discharge characteristics according to claim 1, characterized in that, The term "timed discharge" refers to opening the electric valve corresponding to the next drainage branch after a preset time interval or after the wastewater collection tank has recovered its preset available buffer volume during or after the previous drainage branch has completed its discharge process. The term "delayed discharge" refers to opening the electric valve corresponding to the drainage branch immediately after a discharge demand is generated, and then opening the electric valve to discharge after the preset discharge conditions are met.
9. The method for dynamic allocation of industrial wastewater buffer volume based on process discharge characteristics according to claim 8, characterized in that, The coordinated emission operation steps also include: During the discharge process according to the discharge scheduling plan, the liquid level of the wastewater collection tank, the remaining buffer volume, the operating status of the booster pump, and the discharge status of each drainage branch are continuously monitored. When the drainage branch that has been opened for discharge completes its discharge, or when the booster pump operates and increases the remaining buffer volume of the wastewater collection tank, the discharge condition judgment step is re-executed, and the dynamic discharge scheduling scheme is updated based on the judgment result to further control the opening of the drainage branch that has been temporarily suspended for discharge.
10. A dynamic allocation system for industrial wastewater buffer volume based on process discharge characteristics, used to implement the dynamic allocation method for industrial wastewater buffer volume based on process discharge characteristics as described in any one of claims 1-9, the system comprising: The acquisition module is used to acquire the operating status of each process drainage equipment, the liquid level of each wastewater collection tank, the operating status of the booster pump, and the instantaneous flow rate of each drainage branch. The analysis module is used to calculate the expected discharge volume, discharge duration, and discharge load of each drainage device within a set future time period based on historical discharge data and the operating status of process equipment. The judgment module is used to determine whether each drainage device meets the discharge conditions based on the remaining volume of each wastewater collection tank, the current operating status of the booster pump, and the expected discharge load. The scheduling module is used to open the corresponding electric valves for equipment that meets the emission conditions, delay the emission of equipment that does not yet meet the emission conditions, and recalculate the emission sequence of each equipment. The control module is used to control the opening and closing of the electric valves of each drainage branch, so that the wastewater enters the booster pump room according to the set rhythm, and the booster pump runs continuously and reduces frequent start and stop.