A one-to-many pressure dosing method and system for wastewater treatment

Abstract

This application relates to the technical field of wastewater treatment, and more particularly to a one-to-many pressure dosing method and system for wastewater treatment. This application establishes a relationship between different total pressures and the maximum flow rate of each branch pipe by setting different total pressure values ​​and measuring the upper limit of the flow rate of multiple parallel dosing branches. This allows the optimal total pressure setpoint to be determined by inputting the required dosing flow rate. After determining the total pressure setpoint, the static pressure change of each branch pipe and the corresponding branch pipe flow rate are measured using the Bernoulli equation. This establishes the relationship between the branch pipe static pressure and the branch pipe flow rate under constant total pressure (P=MQ). 2 +N); Based on the required dosing flow rate of each branch pipe, substitute it into the relationship between branch pipe static pressure and branch pipe flow rate, and calculate the static pressure value of each branch pipe under the target flow rate in reverse. Adjust the static pressure of the branch pipe accordingly to achieve precise control of the actual flow rate of each dosing point. Compared with the traditional one-to-one dosing pump solution, it can significantly reduce the construction and operation costs of the dosing system.

Description

Technical Field

[0001] This application relates to the technical field of wastewater treatment, and in particular to a one-to-many pressure dosing method and system for wastewater treatment. Background Technology

[0002] Wastewater treatment is a crucial aspect of environmental protection. Currently, my country primarily employs centralized treatment methods, including municipal wastewater treatment plants and industrial wastewater treatment plants. Wastewater treatment typically combines biological methods with chemical dosing, with chemical dosing being a key step in ensuring effective treatment. Different types of wastewater require different types of chemicals to guarantee optimal treatment results.

[0003] Existing wastewater treatment chemical dosing systems typically employ a single diaphragm pump or metering pump for one-to-one dosing, allowing for precise control and metering of the dosage at each point. However, this approach is susceptible to degradation due to chemical corrosion and scaling, and requires more pumps and piping for multiple dosing points, resulting in a larger footprint and higher cost. For one-to-many dosing, a single diaphragm pump or metering pump simultaneously dispenses chemicals to multiple points. This method saves space and is less expensive, but requires a single pump for multiple points, necessitating simple control of the dosage via valves at each point. This lack of precise control at individual points leads to significant dosage deviations, affecting water quality standards or increasing operating costs due to overdosing.

[0004] Furthermore, existing one-to-many dosing systems typically employ gravity flow for reagent dispensing. This involves placing reagent storage tanks at elevated levels and utilizing gravitational potential energy differences to deliver the reagents to each dosing point. However, due to the influence of pipeline resistance and liquid level, it is difficult to accurately control the actual flow rate at each dosing point in gravity flow systems. Simultaneously, mutual interference between branch pipes leads to uneven flow distribution, making precise control of the flow rate in each dosing branch pipe impossible, resulting in reagent waste or insufficient dosing. These issues require further improvement. Summary of the Invention

[0005] To address the problem of uneven flow distribution and inability to precisely control the flow rate of each dosing branch pipe due to mutual interference between existing branch pipes, this application provides a one-to-many pressure dosing method and system for wastewater treatment, employing the following technical solution:

[0006] In a first aspect, this application provides a one-to-many pressure dosing method for wastewater treatment, comprising the following steps:

[0007] The upper limit of flow rate was measured for multiple parallel dosing branches, and the relationship between different total pressures and the maximum flow rate of each branch was established.

[0008] Based on the relationship between different total pressures and the maximum flow rate of each branch pipe, the optimal total pressure setting value is obtained. Under the optimal total pressure setting value, the static pressure of each dosing branch pipe is changed. The dosing process is executed under different static pressures to obtain the corresponding data of static pressure P and flow rate Q of each branch pipe.

[0009] Based on the corresponding data of static pressure P and flow rate Q of each branch pipe, the formula P=MQ²+N is used to fit the data to obtain the fitting coefficients M and N of each branch pipe and the correlation coefficient R² of the fitting formula. When the correlation coefficient is greater than the target value, it indicates that the calibrated correlation coefficient between the branch pipe flow rate and static pressure meets the operating requirements.

[0010] Based on the fitting coefficient of each branch pipe, input the target flow rate value required for each branch pipe, and the system will calculate the target static pressure value corresponding to the target flow rate of each branch pipe respectively.

[0011] Based on the target static pressure value of each branch pipe, the actual static pressure value of each branch pipe is adjusted to ensure that the actual dosing flow rate is within the deviation range of the input target flow rate, thereby achieving multi-point simultaneous dosing flow rate control.

[0012] By adopting the above technical solution, the actual flow rate of each branch pipe in the existing gravity-fed dosing system fluctuates due to factors such as pipe resistance and liquid level. For example, in the actual operation of a sewage treatment plant, even if the valve opening of each branch pipe is adjusted to the same value, the actual flow rate of each dosing point may still differ by more than 30%, resulting in excessive dosing at some dosing points and insufficient dosing at others. This application sets different total pressure values ​​and measures the upper limit of the flow rate of multiple parallel dosing branches to obtain the actual flow rate range of each dosing branch under the fully open state. By establishing the relationship between different total pressures and the maximum flow rate of each branch pipe, the maximum value of the continuous intersection of the total pressure range of each branch pipe can be determined by inputting the required dosing flow rate, thus obtaining the optimal total pressure setting value. After determining the total pressure setting value, the static pressure change of each branch pipe and the corresponding branch pipe flow rate are measured using the principle of Bernoulli's equation to establish the relationship between the static pressure and the flow rate of the branch pipe under constant total pressure (P=MQ). 2 +N); Based on the required dosing flow rate of each branch pipe, substitute it into the relationship between branch pipe static pressure and branch pipe flow rate, and calculate the static pressure value of each branch pipe under the target flow rate in reverse. Adjust the static pressure of the branch pipe accordingly to achieve precise control of the actual flow rate of each dosing point. Compared with the traditional one-to-one dosing pump solution, it can significantly reduce the construction and operation costs of the dosing system.

[0013] Optionally, the method further includes the following steps:

[0014] The actual flow rate of each branch pipe was measured using a flow measuring device to obtain the actual flow rate data;

[0015] Based on the comparison between the actual flow rate data and the target flow rate, the deviation rate |A%| of each branch pipe is calculated.

[0016] Based on the deviation rate, the target static pressure value of each branch pipe is corrected using the formula P1=P0*(1±|A%|), where P1 is the corrected target static pressure value and P0 is the original target static pressure value, in order to calibrate the deviation rate.

[0017] By adopting the above technical solution, the viscosity, temperature, and other physical properties of the agents change over time during the sewage treatment process, and scaling and blockage may occur in the pipelines. This can lead to deviations in the actual flow rate of each branch pipe even if the target static pressure value is set according to the aforementioned method. This application addresses this by installing a flow measurement device at the end of each branch pipe to periodically collect the actual flow rate data of each branch pipe. The collected actual flow rate is compared with the set target flow rate to calculate the deviation percentage |A%|. Then, using the proportional correction principle, the original target static pressure value P0 is corrected using the formula P1=P0*(1±|A%|), where a minus sign is used when the actual flow rate is greater than the target flow rate, and a plus sign is used otherwise. Finally, this calibration process is repeated until the flow deviation of each branch pipe is reduced to the preset range. This not only enables timely detection and correction of flow deviations but also allows for the discovery of pipeline abnormalities by recording correction data, effectively preventing various operational failures.

[0018] Optionally, the upper limit of flow rate for multiple parallel dosing branches can be determined to establish the relationship between different total pressures and the maximum flow rate of each branch. This includes the following steps:

[0019] By setting different total pressure values, the actual flow range of each dosing branch pipe under the fully open state under different total pressure values ​​is obtained;

[0020] The actual flow range of each dosing branch pipe under fully open conditions was calibrated, and the relationship between different total pressures and the maximum flow rate of each branch pipe was established.

[0021] By adopting the above technical solution, this application first sets multiple different total pressure values ​​in the dosing system and sets the opening of the regulating valve of each dosing branch pipe to the fully open state; then, under each set total pressure value, the actual flow data of each branch pipe is measured and recorded to obtain the flow variation range of each branch pipe under different total pressures; next, the measured flow data is calibrated by the system; finally, the processed data is organized into a standardized comparison table of the relationship between total pressure and maximum flow of each branch pipe, which serves as the basic parameter for subsequent precise dosing control.

[0022] Optionally, based on the relationship between different total pressures and the maximum flow rate of each branch pipe, an optimal total pressure setting value is obtained. Under the optimal total pressure setting value, the static pressure of each dosing branch pipe is changed, and the dosing process is executed under different static pressures to obtain the corresponding data of static pressure P and flow rate Q for each branch pipe. Specifically, this includes the following steps:

[0023] Obtain the total pressure range calibrated under the working conditions of each branch pipe;

[0024] Based on the relationship between the different total pressures and the maximum flow rates of each branch pipe, and the total pressure range, the maximum value of the continuous intersection of the total pressure ranges of each branch pipe is determined, and the optimal total pressure setting value is obtained.

[0025] Under the optimal total pressure setting value, multiple sets of different static pressure values ​​are set sequentially for each dosing branch pipe, and the corresponding branch pipe static pressure and flow rate data are collected to obtain the corresponding data of the branch pipe static pressure P and flow rate Q.

[0026] By adopting the above technical solution, this application first obtains the total pressure range of each branch pipe under normal operating conditions. The range is determined by the previously calibrated total pressure-maximum flow rate relationship table. Then, the total pressure range of each branch pipe is analyzed to find the continuous intersection of these ranges, and the maximum value of the intersection range is taken as the optimal total pressure setting value of the system to ensure that all branch pipes can work within the optimal pressure range. Next, under the determined optimal total pressure setting value, multiple sets of different static pressure values ​​are set, and the corresponding static pressure and flow rate data of the branch pipes are collected to obtain the corresponding data of static pressure P and flow rate Q of the branch pipes.

[0027] Optionally, the deviation rate is calibrated, specifically including the following steps:

[0028] Based on the corrected target static pressure value, the actual flow rate of each branch pipe is measured using a flow measuring device to obtain new actual flow rate data;

[0029] The calibrated deviation rate is calculated by comparing the new actual flow data with the target flow.

[0030] Determine whether the deviation rate after calibration exceeds the first preset threshold. If it does, determine whether it exceeds the second preset threshold. If it does, obtain an alarm signal for excessive deviation. If it does not exceed, perform the first flow calibration.

[0031] When the calibrated deviation rate exceeds the first preset threshold, it is determined whether it exceeds the second preset threshold; if it exceeds, an alarm signal for excessive deviation is obtained; if it does not exceed, a second flow calibration is performed.

[0032] After multiple rounds of calibration, calibration will stop when the deviation rate is less than the first preset threshold, or when the total deviation rate accumulated from each round of calibration is greater than the second preset threshold, an alarm signal will be issued.

[0033] By adopting the above technical solution, this application first adjusts the system operation according to the corrected target static pressure value, and collects the actual flow data of each branch pipe through a flow measuring device; then, the collected actual flow is compared with the set target flow to calculate the current flow deviation rate; next, the deviation rate is compared with a preset first threshold. When the deviation rate exceeds the first threshold, the system will further determine whether it exceeds the second threshold; if it exceeds the second threshold, the system will directly issue an alarm signal for excessive deviation, prompting the operator to check; if the deviation rate is between the two thresholds, the system will automatically start the first flow calibration procedure, and compensate for the deviation by adjusting the pressure parameters; if the deviation still exists after the first calibration, the system will continue to perform the second calibration, and so on for multiple rounds of calibration until the deviation rate is reduced to below the first threshold, or the cumulative deviation exceeds the second threshold, at which point an alarm signal is issued.

[0034] Optionally, the method further includes the following steps:

[0035] Record the initial static pressure value of the dosing branch pipe to obtain the initial pressure value;

[0036] Within multiple consecutive dosing cycles, the static pressure value of the pipeline after calibration in each cycle is recorded to obtain the cumulative pressure change data;

[0037] Based on the cumulative pressure change data, when the deviation rate of the last recorded pressure value relative to the initial pressure value exceeds a preset adjustable threshold, an alarm signal indicating that the cumulative pressure deviation is out of range is determined.

[0038] By adopting the above technical solution, since scaling, blockage, corrosion and other problems in pipelines are often gradual accumulation processes, focusing only on single flow deviations may fail to detect the gradual deterioration of system performance in a timely manner. This application first records the initial static pressure value of each branch pipe during normal system operation as baseline data; then, in multiple consecutive dosing cycles, the pipeline static pressure value after flow calibration in each cycle is recorded, forming a data sequence reflecting the pressure change trend; finally, the most recently recorded pressure value is compared with the initial pressure value, and when the deviation rate exceeds a preset adjustable threshold (e.g., 15%), the system will issue an alarm signal indicating that the cumulative pressure deviation is out of range. Through this continuous pressure trend analysis, the gradual anomalies of the pipeline system can be effectively identified, providing a basis for decision-making for preventive maintenance, thereby reducing the risk of equipment failure and extending the service life of the system.

[0039] Optionally, the flow measuring device includes a constant volume container, a non-contact water flow indicator switch installed in the inlet and outlet pipes of the constant volume container, and a switching valve connected to the dosing branch pipe. The flow measuring device measures the actual flow rate of each branch pipe, specifically including the following steps:

[0040] Switch the dosing branch switching valve to the flow verification pipeline;

[0041] The time difference between the liquid medicine passing through the constant volume container is recorded by the non-contact water flow indicator switch.

[0042] The actual dosing flow rate is calculated based on the time difference and the fixed volume of the constant-volume container.

[0043] Switch the dosing branch pipe switching valve back to the dosing pipeline, and open the vent valve of the flow measurement device.

[0044] By adopting the above technical solution, traditional flow meters are prone to measurement errors and blockage after long-term use due to the high viscosity and easy crystallization characteristics of flocculants and coagulants commonly used in sewage treatment. This application first switches the switching valve to the flow calibration pipeline, allowing the liquid to enter the constant volume container. When the liquid flows through the constant volume container, the time points when the liquid reaches the inlet and outlet are recorded by the non-contact water flow indicator switches of the inlet and outlet pipelines, respectively, to obtain the time difference Δt. Then, based on the known volume V of the constant volume container and the measured time difference Δt, the actual flow rate is calculated using the formula Q=V / Δt. Finally, the switching valve is switched back to the normal dosing pipeline, and the vent valve of the flow measuring device is opened to empty the liquid in the constant volume container. This non-contact constant volume measurement method not only avoids measurement errors caused by scaling, but also makes the measurement results more reliable because a fixed volume is used as the benchmark, while significantly reducing equipment maintenance costs.

[0045] Secondly, this application provides a one-to-many pressure dosing system for wastewater treatment, comprising:

[0046] The module for obtaining the relationship between different total pressures and the maximum flow rate of each branch pipe is used to measure the upper limit of the flow rate of multiple parallel dosing branches and establish the relationship between different total pressures and the maximum flow rate of each branch pipe.

[0047] The static pressure-flow rate corresponding data acquisition module is used to obtain the optimal total pressure setting value based on the relationship between the different total pressures and the maximum flow rate of each branch pipe, change the static pressure of each dosing branch pipe under the optimal total pressure setting value, execute the dosing process under different static pressures, and obtain the corresponding data of static pressure P and flow rate Q of each branch pipe.

[0048] The branch pipe fitting coefficient acquisition module is used to fit the corresponding data of static pressure P and flow rate Q of each branch pipe using the formula P=MQ²+N to obtain the fitting coefficients M and N of each branch pipe and the correlation coefficient R² of the fitting formula. When the correlation coefficient is greater than the target value, it means that the calibrated correlation coefficient between the branch pipe flow rate and static pressure meets the operating requirements.

[0049] The target static pressure value calculation module is used to calculate the target static pressure value corresponding to the target flow rate of each branch pipe based on the fitting coefficient of each branch pipe and the input of the target flow rate value of each branch pipe.

[0050] The multi-point dosing flow control module is used to adjust the actual static pressure value of each branch pipe based on the target static pressure value of each branch pipe, so as to ensure that the actual dosing flow rate is within the deviation range of the input target flow rate, and realize multi-point simultaneous dosing flow control.

[0051] Thirdly, this application provides an electronic device including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the above-described one-to-many pressure dosing method for wastewater treatment.

[0052] Fourthly, this application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the above-described one-to-many pressure dosing method for wastewater treatment.

[0053] In summary, this application includes at least one of the following beneficial technical effects:

[0054] 1. This application determines the upper limit of flow rate for multiple parallel dosing branches by setting different total pressure values, thereby obtaining the actual flow range of each branch under fully open conditions. Furthermore, by establishing the relationship between different total pressures and the maximum flow rate of each branch, the maximum value of the continuous intersection of the total pressure ranges of each branch can be determined by inputting the required dosing flow rate, thus obtaining the optimal total pressure setpoint. After determining the total pressure setpoint, the static pressure change of each branch and the corresponding branch flow rate are measured using the Bernoulli equation, establishing the relationship between branch static pressure and branch flow rate under constant total pressure (P=MQ). 2 +N); Based on the required dosing flow rate of each branch pipe, substitute it into the relationship between branch pipe static pressure and branch pipe flow rate, and calculate the static pressure value of each branch pipe under the target flow rate in reverse. Adjust the static pressure of the branch pipe accordingly to achieve precise control of the actual flow rate of each dosing point. Compared with the traditional one-to-one dosing pump solution, it can significantly reduce the construction and operation costs of the dosing system.

[0055] 2. This application involves installing a flow measurement device at the end of each branch pipe to periodically collect actual flow data from each branch pipe; comparing the collected actual flow with the set target flow to calculate the deviation percentage |A%|; then applying the proportional correction principle, correcting the original target static pressure value P0 using the formula P1=P0*(1±|A%|), where a minus sign is used when the actual flow is greater than the target flow, and a plus sign is used otherwise; finally, this calibration process is repeated until the flow deviation of each branch pipe is reduced to the preset range; this not only enables timely detection and correction of flow deviations, but also allows for the discovery of pipeline abnormalities by recording correction data, effectively preventing various operational failures;

[0056] 3. This application first obtains the total pressure range of each branch pipe under normal operating conditions. The range is determined by the previously calibrated total pressure-maximum flow rate relationship table. Then, it analyzes the total pressure range of each branch pipe, finds the continuous intersection of these ranges, and takes the maximum value of the intersection range as the optimal total pressure setting value of the system to ensure that all branch pipes can work within the optimal pressure range. Next, under the determined optimal total pressure setting value, multiple sets of different static pressure values ​​are set, and the corresponding static pressure and flow rate data of the branch pipes are collected to obtain the corresponding data of static pressure P and flow rate Q of the branch pipes. Attached Figure Description

[0057] Figure 1 This is a schematic flowchart of a one-to-many pressure dosing method for wastewater treatment according to an embodiment of this application;

[0058] Figure 2 This is a schematic flowchart illustrating the deviation verification process in a one-to-many pressure dosing method for wastewater treatment according to an embodiment of this application.

[0059] Figure 3 This is a schematic flowchart of step S110 in a one-to-many pressure dosing method for wastewater treatment according to an embodiment of this application;

[0060] Figure 4 This is a schematic flowchart of step S120 in a one-to-many pressure dosing method for wastewater treatment according to an embodiment of this application;

[0061] Figure 5 This is a schematic flowchart of step S210 in a one-to-many pressure dosing method for wastewater treatment according to an embodiment of this application;

[0062] Figure 6 This is a schematic flowchart of step S230 in a one-to-many pressure dosing method for wastewater treatment according to an embodiment of this application;

[0063] Figure 7 This is a schematic flowchart illustrating the calculation of cumulative pressure deviation in a one-to-many pressure dosing method for wastewater treatment according to an embodiment of this application.

[0064] Figure 8 This is a schematic diagram of a one-to-many pressure dosing system for wastewater treatment according to an embodiment of this application;

[0065] Figure 9 This is an internal structural diagram of an electronic device according to an embodiment of this application. Detailed Implementation

[0066] The terminology used in the following embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. As used in the specification and appended claims of this application, the singular expressions “a,” “an,” “the,” “the,” “the,” and “this” are intended to include the plural expressions as well, unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in this application refers to any or all possible combinations including one or more of the listed items.

[0067] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as implying or suggesting relative importance or implicitly indicating the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature, and in the description of the embodiments of this application, unless otherwise stated, "multiple" means two or more.

[0068] The embodiments of this application will now be described in further detail with reference to the accompanying drawings.

[0069] Firstly, this application provides a one-to-many pressure dosing method for wastewater treatment, referring to... Figure 1 It includes the following steps:

[0070] S110. Measure the upper limit of flow rate for multiple parallel dosing branches and establish the relationship between different total pressures and the maximum flow rate of each branch.

[0071] Specifically, during the calibration process, different total pressure values ​​were set, and the actual flow rates of each branch pipe in the fully open state were measured and recorded. A standardized table of total pressure versus maximum flow rate of each branch pipe was established using the data collected by the system, providing basic parameters for subsequent control.

[0072] S120. Based on the relationship between different total pressures and the maximum flow rate of each branch pipe, obtain the optimal total pressure setting value. Under the optimal total pressure setting value, change the static pressure of each dosing branch pipe and execute the dosing process under different static pressures to obtain the corresponding data of static pressure P and flow rate Q of each branch pipe.

[0073] S130. Based on the corresponding data of static pressure P and flow rate Q of each branch pipe, the fitting coefficients M and N of each branch pipe are obtained by fitting the data using the formula P=MQ²+N.

[0074] Specifically, to establish an accurate branch pipe control model, the measured pressure-flow data needs to be mathematically processed. Based on fluid mechanics principles, a quadratic equation P = MQ² + N is used for fitting, where P is static pressure, Q is flow rate, and M and N are undetermined coefficients. The least squares method is used to fit each set of test data to obtain the characteristic equation for each branch pipe. The system automatically determines whether the goodness-of-fit R² is greater than 0.98. If the condition is met, the parameters M and N are recorded to complete the calibration; otherwise, recalibration is prompted.

[0075] S140. Based on the fitting coefficient of each branch pipe, input the target flow rate value required for each branch pipe, and the system calculates the target static pressure value corresponding to the target flow rate of each branch pipe.

[0076] Specifically, the target flow rate required by the process is substituted into the characteristic equation P=MQ²+N to calculate the target static pressure value required to achieve that flow rate.

[0077] S150. Based on the target static pressure value of each branch pipe, adjust the actual static pressure value of each branch pipe to ensure that the actual dosing flow rate is within the deviation range of the input target flow rate, thereby achieving multi-point simultaneous dosing flow rate control.

[0078] In this embodiment, the target flow rate refers to the flow rate set for each branch pipe as required by the process; the target static pressure value refers to the branch pipe pressure required to achieve the target flow rate; and the valve opening degree refers to the degree to which the regulating valve is opened, expressed as a percentage.

[0079] Specifically, in actual operation, the target flow rate of each branch pipe is first determined based on process requirements. The target flow rate is then substituted into the characteristic equation of the corresponding branch pipe to calculate the required target static pressure value. Then, by adjusting the actual static pressure value of each branch pipe, for example, by adjusting the valve opening of the branch pipe, the actual static pressure is brought to the calculated value. This process is executed synchronously for all branches, achieving coordinated multi-point dosing.

[0080] In one embodiment, refer to Figure 2 The method also includes the following steps:

[0081] S210. Measure the actual flow rate of each branch pipe using a flow measuring device to obtain the actual flow rate data.

[0082] In this embodiment, the flow measurement device is independent of the dosing system and is used to verify the actual dosing amount; the actual flow data refers to the current flow value of each branch pipe measured by the flow measurement device; the target flow refers to the dosing amount of each branch pipe set by the process.

[0083] Specifically, this embodiment employs an independent flow calibration method to verify the system's operational accuracy. A bypass structure is installed at the outlet end of each branch pipe, allowing the liquid to be introduced into the calibration device by switching valves. Once the system is running stably, the flow rate of each branch pipe is measured sequentially, avoiding the maintenance difficulties of online flow meters while ensuring the reliability of the measurement results.

[0084] Understandably, verification requires meeting certain initiation conditions. These conditions are the prerequisites for the system to enter verification mode; the dosing tank level H-value refers to the minimum required liquid level for verification. Specifically, the system establishes a verification condition judgment mechanism. A verification condition checklist is created, including key parameters such as dosing status and liquid level. When the operator clicks the branch pipe verification button, the system automatically checks whether the current dosing step is underway or whether the liquid level is higher than the preset H-value. Only when these conditions are met is the verification process allowed to begin. This condition prediction helps prevent abnormal situations such as insufficient liquid level during verification.

[0085] S220. Based on the comparison between the actual flow rate data and the target flow rate, the deviation rate |A%| of each branch pipe is calculated.

[0086] In this embodiment, the deviation rate |A%| refers to the absolute value of the relative error between the actual flow rate and the target flow rate, expressed as a percentage; the preset deviation value refers to the maximum flow rate error allowed by the system, which is generally determined by process requirements.

[0087] Specifically, the system uses a data comparison method to calculate flow deviation. First, a basic data table is established, containing the branch pipe number, target flow rate, and measured flow rate. The deviation rate of each branch pipe is calculated using the formula |A%|=|(measured flow rate - target flow rate) / target flow rate|×100%.

[0088] S230. Based on the deviation rate, the target static pressure value of each branch pipe is corrected using the formula P1=P0*(1±|A%|).

[0089] Where P1 is the corrected target static pressure value, and P0 is the original target static pressure value.

[0090] In this embodiment, the corrected target static pressure value P1 refers to the new pressure setting value calculated based on the deviation; the original target static pressure value P0 refers to the currently used pressure setting value; the positive or negative sign in the pressure correction formula P1=P0*(1±|A%|) is selected according to whether the actual flow rate is too large or too small.

[0091] Specifically, the system establishes a pressure correction mechanism. When the actual flow rate is too high, the pressure setpoint is reduced by a decrease factor (1-|A%|); when the actual flow rate is too low, the pressure setpoint is increased by an increase factor (1+|A%|) to calibrate the deviation rate.

[0092] In one embodiment, refer to Figure 3 In step S110, the upper limit of the flow rate of multiple parallel dosing branches is measured to establish the relationship between different total pressures and the maximum flow rate of each branch. Specifically, this includes the following steps:

[0093] S111. Set different total pressure values ​​to obtain the actual flow range of each dosing branch pipe under the fully open state under different total pressure values.

[0094] S112. Calibrate the actual flow range of each dosing branch pipe under the fully open state, and establish the relationship between different total pressures and the maximum flow of each branch pipe.

[0095] In one embodiment, refer to Figure 4 In step S120, based on the relationship between different total pressures and the maximum flow rates of each branch pipe, the optimal total pressure setting value is obtained. Under the optimal total pressure setting value, the static pressure of each dosing branch pipe is changed, and the dosing process is executed under different static pressures to obtain the corresponding data of static pressure P and flow rate Q for each branch pipe. Specifically, the steps are as follows:

[0096] S121. Obtain the total pressure range calibrated under the working conditions of each branch pipe.

[0097] Specifically, based on the relationship between different total pressures and the maximum flow rates of each branch pipe established in step S110, the trend of flow rate variation of each branch pipe with total pressure is analyzed. The pressure range in which the flow rate of each branch pipe changes stably and meets the process requirements is determined as the effective working pressure range of that branch pipe. For example, the working pressure range of branch pipe A is 2.5-4.0 bar, and that of branch pipe B is 3.0-4.5 bar, etc.

[0098] S122. Based on the relationship between different total pressures and the maximum flow rates of each branch pipe, and the total pressure range, determine the maximum value of the continuous intersection of the total pressure ranges of each branch pipe, and obtain the optimal total pressure setting value.

[0099] Specifically, the working pressure ranges of all branch pipes are overlaid and analyzed to identify the common overlapping portion of these ranges. The maximum value within this overlapping range is selected as the optimal total pressure setpoint for the system. This ensures that all branch pipes operate within their respective effective pressure ranges while guaranteeing sufficient adjustment margin.

[0100] It is worth noting that this application is applicable to working conditions where the flow ranges of multiple branch pipes are not significantly different. If there is no overlap in the total pressure range between branch pipes, a larger total pressure is selected based on a branch pipe with a large flow rate. For branch pipes with small flow rates, the valve opening needs to be adjusted to a very small value. In this working condition, the adjustment becomes more difficult for branch pipes with small flow rates, and the operation is uneconomical.

[0101] S123. Under the optimal total pressure setting value, each dosing branch pipe is sequentially set with multiple sets of different static pressure values, and the corresponding branch pipe static pressure and flow rate data are collected to obtain the corresponding data of the branch pipe static pressure P and flow rate Q.

[0102] Specifically, the total system pressure is set to the optimal pressure parameter, and different static pressure values ​​are set at uniform intervals. For example, a sequence of regulating valve openings is set, with uniform intervals between each opening point to facilitate subsequent data processing and model building. At each opening point, static pressure and flow data of the branch pipes are collected simultaneously.

[0103] In one embodiment, the flow measurement device includes a constant volume container, a non-contact flow indicator switch disposed on the inlet and outlet pipes of the constant volume container, and a switching valve connected to the dosing branch pipe, as shown in the reference. Figure 5 In step S210, the actual flow rate of each branch pipe is measured using a flow measuring device, specifically including the following steps:

[0104] S211, switch the dosing branch switching valve to the flow verification pipeline.

[0105] In this embodiment, the switching valve can realize the conversion of the flow direction of the liquid medicine; the flow calibration pipeline refers to the bypass system used to measure the flow rate, including the inlet pipeline, the volumetric container and the outlet pipeline.

[0106] Specifically, the system employs a flow direction switching scheme. A valve status mapping table is established, defining two operating positions for the switching valve: dosing position and calibration position. When flow measurement is required, the control system automatically executes the switching command according to the mapping table, directing the solution into the calibration pipeline. It is understood that manual switching can also be used.

[0107] S212. Record the time difference before and after the liquid passes through the fixed volume container by a non-contact water flow indicator switch.

[0108] In this embodiment, the non-contact water flow indicator switch refers to a liquid level detection device installed outside the pipeline, which detects the moment when the liquid flows through by means of photoelectric or ultrasonic methods; the time difference refers to the time interval between the liquid passing through two switches in sequence.

[0109] Specifically, the timer starts when the liquid medicine flows through the first switch and stops when it flows through the second switch; the system automatically records this time difference. This non-contact measurement method avoids direct contact between the switches and the liquid medicine, extending the equipment's lifespan.

[0110] S213. Calculate the actual dosing flow rate based on the time difference and the fixed volume of the constant-volume container.

[0111] In this embodiment, a fixed-volume container refers to a measuring container with a fixed volume; the actual drug flow rate refers to the flow rate of the drug solution calculated by the volume and time difference.

[0112] Specifically, the system establishes a flow calculation model based on the constant volume method. A flow calculation table is designed, including parameters such as container volume, time difference, and temperature. The system automatically calculates the actual flow rate according to the formula Q=V / ΔT (where V is the container volume and ΔT is the time difference).

[0113] S214. Switch the dosing branch switching valve back to the dosing pipeline and open the vent valve of the flow measurement device.

[0114] In this embodiment, the vent valve refers to the drain valve used to empty the constant volume container; the dosing pipeline refers to the liquid delivery pipeline during normal dosing.

[0115] Specifically, the system employs an automated post-measurement processing procedure. An equipment status recovery table is established, including information such as the position of the switching valve and the status of the vent valve. After measurement, the control system first switches the switching valve back to the dosing position, then opens the vent valve to drain the solution from the volumetric container to the dosing point. This automated processing method ensures the continuity of the measurement process while avoiding waste of the solution.

[0116] In one embodiment, refer to Figure 6 In step S230, the deviation rate is calibrated, which specifically includes the following steps:

[0117] S231. Based on the corrected target static pressure value, measure the actual flow rate of each branch pipe using a flow measuring device to obtain new actual flow rate data.

[0118] In this embodiment, the new actual flow rate data refers to the flow rate measured when running with the corrected pressure value; the corrected target static pressure value refers to the pressure setpoint calculated based on the previous deviation.

[0119] S232. Based on the comparison between the new actual flow data and the target flow, the deviation rate after calibration is calculated.

[0120] S233. Determine whether the deviation rate after calibration exceeds the first preset threshold. If it does, determine whether it exceeds the second preset threshold. If it does, obtain an alarm signal for excessive deviation. If it does not exceed, perform the first flow calibration.

[0121] In this embodiment, the calibrated deviation rate refers to the relative error between the new flow rate measured after pressure correction and the target flow rate; the first preset threshold refers to the maximum deviation value allowed by the system, which is usually set to 5%.

[0122] Specifically, the system employs a data comparison method. A deviation calculation table is established, containing data such as target flow, measured flow, and deviation rate. The new deviation rate is calculated using the formula |(measured flow - target flow) / target flow| × 100%, and the result is stored in the database for trend analysis.

[0123] S234. When the calibrated deviation rate exceeds the first preset threshold, determine whether it exceeds the second preset threshold. If it does, obtain an alarm signal for excessive deviation. If it does not exceed, perform a second flow calibration.

[0124] In this embodiment, the second flow calibration refers to the verification process when the deviation after the first calibration is still within the range of 5%-15%; the calibration result refers to the final flow control effect achieved.

[0125] S235. After multiple rounds of calibration, if the deviation rate is less than the first preset threshold, then stop the calibration; or, if the total deviation rate accumulated from each round of calibration is greater than the second preset threshold, then issue an alarm signal.

[0126] Specifically, after multiple rounds of calibration, calibration stops when the deviation rate is less than a first preset threshold. Alternatively, if the sum of the deviation rates accumulated from each calibration round exceeds a second preset threshold, an alarm signal is issued.

[0127] In one embodiment, refer to Figure 7 The method also includes the following steps:

[0128] S710. Record the initial static pressure value of the dosing branch pipe to obtain the initial pressure value.

[0129] In this embodiment, the initial pressure value P0 refers to the reference static pressure when the branch pipe starts to run; the static pressure value refers to the actual pressure reading in the pipeline without dynamic pressure.

[0130] Specifically, the system establishes a pressure baseline recording mechanism. A pressure baseline table is designed, and at the beginning of each dosing batch, the static pressure value of the equipment under stable operating conditions is recorded as the initial value P0. This baseline value provides a reference standard for subsequent pressure deviation monitoring.

[0131] S720. During multiple consecutive dosing cycles, record the static pressure value of the pipeline after calibration in each cycle to obtain the cumulative pressure change data.

[0132] In this embodiment, the dosing cycle refers to a complete dosing process, which includes flow calibration and pressure adjustment steps; the cumulative pressure change data refers to the pressure value sequence P1, P2, P3 obtained after multiple consecutive calibrations.

[0133] Specifically, the system employs a periodic tracking strategy. A pressure change tracking table is created, and the final stable static pressure value is recorded after calibration is completed in each dosing cycle. The pressure change is calculated using the formula Pi = Pi⁻¹ × (1 ± δi%), where δi% is the correction rate for the i-th calibration. This continuous recording method can reflect the trend of pressure value changes.

[0134] S730. Based on the cumulative pressure change data, when the deviation rate of the last recorded pressure value relative to the initial pressure value exceeds the preset adjustable threshold, an alarm signal indicating that the cumulative pressure deviation is out of range is determined.

[0135] In this embodiment, the preset adjustable threshold X% refers to the maximum allowable cumulative pressure deviation, which is initially set to 15%; the cumulative pressure deviation exceeding the range means that the cumulative change in pressure value exceeds the allowable range after multiple calibrations.

[0136] Specifically, the system is designed with a cumulative deviation monitoring scheme. A pressure deviation analysis table is established, and the cumulative deviation rate is calculated using the formula |(P3-P0) / P0|×100%. When the deviation rate exceeds a set threshold X%, the system automatically issues an alarm signal, indicating a possible pipe blockage or leakage problem. This cumulative deviation monitoring mechanism can promptly detect system anomalies and prevent equipment from operating with defects.

[0137] Furthermore, this application issues a warning message about pipe blockage or leakage when the system detects an anomaly. Pipe blockage or leakage refers to typical fault types that may lead to abnormal pressure.

[0138] Specifically, the system establishes a fault early warning and handling mechanism. A fault type lookup table is designed to associate different pressure change characteristics with possible fault types. When the system issues a cumulative pressure deviation alarm, operators can quickly locate the possible cause of the fault by referring to the lookup table and perform timely inspection and maintenance. This fault early warning mechanism effectively improves equipment maintenance efficiency.

[0139] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0140] Secondly, this application provides a one-to-many pressure dosing system for wastewater treatment. The one-to-many pressure dosing system for wastewater treatment of this application will be described below in conjunction with the above-mentioned one-to-many pressure dosing method for wastewater treatment.

[0141] Reference Figure 8 A one-to-many pressure dosing system for wastewater treatment, comprising:

[0142] The module for obtaining the relationship between different total pressures and the maximum flow rate of each branch pipe is used to measure the upper limit of the flow rate of multiple parallel dosing branches and establish the relationship between different total pressures and the maximum flow rate of each branch pipe.

[0143] The static pressure-flow rate corresponding data acquisition module is used to obtain the optimal total pressure setting value based on the relationship between the different total pressures and the maximum flow rate of each branch pipe, change the static pressure of each dosing branch pipe under the optimal total pressure setting value, execute the dosing process under different static pressures, and obtain the corresponding data of static pressure P and flow rate Q of each branch pipe.

[0144] The branch pipe fitting coefficient acquisition module is used to fit the corresponding data of static pressure P and flow rate Q of each branch pipe using the formula P=MQ²+N to obtain the fitting coefficients M and N of each branch pipe and the correlation coefficient R² of the fitting formula. When the correlation coefficient is greater than the target value, it means that the calibrated correlation coefficient between the branch pipe flow rate and static pressure meets the operating requirements.

[0145] The target static pressure value calculation module is used to calculate the target static pressure value corresponding to the target flow rate of each branch pipe based on the fitting coefficient of each branch pipe and the input of the target flow rate value of each branch pipe.

[0146] The multi-point dosing flow control module is used to adjust the actual static pressure value of each branch pipe based on the target static pressure value of each branch pipe, so as to ensure that the actual dosing flow rate is within the deviation range of the input target flow rate, and realize multi-point simultaneous dosing flow control.

[0147] In one embodiment, this application provides an electronic device, which may be a server, and its internal structure diagram may be as follows: Figure 9 As shown, the electronic device includes a processor, memory, and a network interface connected via a system bus. The processor provides computing and control capabilities. The memory includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The database stores data. The network interface communicates with external terminals via a network connection. When executed by the processor, the computer program implements a one-to-many pressure dosing method for wastewater treatment.

[0148] Those skilled in the art will understand that Figure 9 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the electronic device to which the present application is applied. The specific electronic device may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0149] In one embodiment, an electronic device is also provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps in the above-described method embodiments.

[0150] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments of the above methods. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, or optical storage, etc. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc.

[0151] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A one-to-many pressure dosing method for wastewater treatment, characterized by, The method comprises the following steps: respectively measuring the flow upper limit of a plurality of parallel dosing branch pipes, and establishing a relationship between different total pressures and maximum flow of each branch pipe; According to the relationship between the different total pressures and the maximum flow of each branch pipe, the optimal total pressure setting value is obtained, the static pressure of each dosing branch pipe is changed under the optimal total pressure setting value, the dosing process is performed under different static pressures, and corresponding data of static pressure P and flow Q of each branch pipe is obtained; Based on the corresponding data of static pressure P and flow Q of each branch pipe, the fitting formula P=MQ²+N is used for fitting respectively, the fitting coefficients M and N of each branch pipe and the correlation coefficient R² of the fitting formula are obtained, and when the correlation coefficient is greater than a target value, it is indicated that the fitting correlation coefficient of the branch pipe flow and the static pressure meets the operation requirement; According to the fitting coefficients of each branch pipe, the target flow value required by each branch pipe is input, and the system calculates the target static pressure value corresponding to the target flow of each branch pipe; Based on the target static pressure value of each branch pipe, the actual static pressure value of each branch pipe is adjusted to ensure that the actual dosing flow is within the deviation range of the input target flow, and multi-point simultaneous dosing flow control is realized.

2. The one-to-many pressure dosing method for wastewater treatment of claim 1, wherein, The method further comprises the following steps: The actual flow of each branch pipe is measured by a flow measuring device to obtain actual flow data; According to the comparison between the actual flow data and the target flow, the deviation rate |A%| of each branch pipe is calculated; Based on the deviation rate, the target static pressure value of each branch pipe is corrected by the formula P1=P0*(1±|A%|), wherein P1 is the corrected target static pressure value and P0 is the original target static pressure value, so as to calibrate the deviation rate.

3. The one-to-many pressure dosing method for wastewater treatment of claim 1, wherein, Respectively measuring the flow upper limit of a plurality of parallel dosing branch pipes, and establishing a relationship between different total pressures and maximum flow of each branch pipe, specifically comprising the following steps: Different total pressure values are set to obtain the actual flow range of each dosing branch pipe under the full opening state under different total pressure values; The actual flow range of each dosing branch pipe under the full opening state is calibrated to establish a relationship between different total pressures and maximum flow of each branch pipe.

4. The one-to-many pressure dosing method for wastewater treatment of claim 3, wherein, According to the relationship between the different total pressures and the maximum flow of each branch pipe, the optimal total pressure setting value is obtained, the static pressure of each dosing branch pipe is changed under the optimal total pressure setting value, the dosing process is performed under different static pressures, and corresponding data of static pressure P and flow Q of each branch pipe is obtained, specifically comprising the following steps: Obtain the calibrated total pressure interval of each branch pipe under the working state; According to the relationship between the different total pressures and the maximum flow of each branch pipe and the total pressure interval, the maximum value of the continuous intersection part of the total pressure interval of each branch pipe is determined to obtain the optimal total pressure setting value; Under the optimal total pressure setting value, a plurality of different static pressure values are set for each dosing branch pipe in turn, corresponding branch pipe static pressure and flow data are collected, and corresponding data of static pressure P and flow Q of each branch pipe is obtained.

5. The one-to-many pressure dosing method for wastewater treatment of claim 2, wherein, Calibrating the deviation rate, specifically comprising the following steps: According to the corrected target static pressure value, the actual flow of each branch pipe is measured by a flow measuring device to obtain new actual flow data; According to the comparison between the new actual flow data and the target flow, the calibrated deviation rate is calculated; determining whether the calibrated deviation rate exceeds the first preset threshold value, and if so, determining whether the second preset threshold value is exceeded; if so, obtaining a deviation too large alarm signal, and if not, performing first flow calibration; when the calibrated deviation rate exceeds the first preset threshold value, determining whether the second preset threshold value is exceeded; if so, obtaining a deviation too large alarm signal, and if not, performing second flow calibration; after multiple rounds of calibration, stopping calibration when the deviation rate is less than the first preset threshold value, or issuing an alarm signal when the cumulative deviation rate of each round of calibration is greater than the second preset threshold value.

6. The one-to-many pressure dosing method for wastewater treatment of claim 5, wherein, The method further comprises the following steps: record the initial dosing branch pipe static pressure value to obtain an initial pressure value; in a plurality of consecutive dosing cycles, record the pipe static pressure value after each cycle is completed, to obtain cumulative pressure change data; according to the cumulative pressure change data, when the deviation rate of the last recorded pressure value relative to the initial pressure value exceeds the preset adjustable threshold value, determine an alarm signal for cumulative pressure deviation out of range.

7. The one-to-many pressure dosing method for wastewater treatment of claim 2, wherein, The flow measuring device comprises a constant volume container, a non-contact water flow indicating switch arranged on the water inlet and outlet pipeline of the constant volume container, and a switching valve connected with the dosing branch pipe, and the actual flow of each branch pipe is measured by the flow measuring device, and the specific steps comprise: switch the dosing branch pipe switching valve to the flow calibration pipeline; record the time difference of the liquid before and after passing through the constant volume container through the non-contact water flow indicating switch; calculate the actual dosing flow according to the time difference and the fixed volume of the constant volume container; switch the dosing branch pipe switching valve back to the dosing pipeline, and open the vent valve of the flow measuring device.

8. A one-to-many pressure dosing system for wastewater treatment, characterized by, It comprises: a relationship acquisition module between different total pressures and maximum flows of each branch pipe, which is used to measure the upper limit of the flow of a plurality of parallel dosing branch pipes, and establish the relationship between different total pressures and maximum flows of each branch pipe; a static pressure flow corresponding data acquisition module, which is used to obtain an optimal total pressure set value according to the relationship between different total pressures and maximum flows of each branch pipe, change the static pressure of each dosing branch pipe under the optimal total pressure set value, perform a dosing process under different static pressures, and obtain corresponding data of the static pressure P and the flow Q of each branch pipe; a branch pipe fitting coefficient acquisition module, which is used to fit each branch pipe by using the formula P=MQ²+N based on the corresponding data of the static pressure P and the flow Q of each branch pipe, obtain the fitting coefficients M, N of each branch pipe and the correlation coefficient R² of the fitting formula, and when the correlation coefficient is greater than a target value, it is indicated that the calibrated branch pipe flow and static pressure correlation coefficient meets the operation requirement; a target static pressure value calculation module, which is used to input the target flow value required by each branch pipe according to the fitting coefficients of each branch pipe, and the system calculates the target static pressure value corresponding to the target flow of each branch pipe; a multi-point dosing flow control module, which is used to adjust the actual static pressure value of each branch pipe based on the target static pressure value of each branch pipe, so as to ensure that the actual dosing flow is within the input target flow deviation range, and realize multi-point simultaneous dosing flow control.

9. An electronic device, comprising: A computer program product comprising a memory, a processor, and a computer program stored on the memory and loadable on the processor, the processor implementing the steps of the one-to-many pressure dosing method for wastewater treatment according to any one of claims 1 to 7 when executing the computer program.

10. A computer-readable storage medium having stored thereon a computer program, characterized in that, The computer program product, when executed by the processor, implements the steps of the one-to-many pressure dosing method for wastewater treatment according to any one of claims 1 to 7.

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