One-to-many pressure dosing method and system for sewage treatment

Abstract

The invention relates to the technical field of sewage treatment, in particular to a one-to-many pressure dosing method and system for sewage treatment. Different total pressure values are set, the upper limit of the flow is measured for the multiple parallel dosing branch pipes, the relation between different total pressures and the maximum flow of each branch pipe is established, the required dosing flow is input, the optimal total pressure set value can be determined, and after the total pressure set value is determined, the optimal dosing flow can be determined according to the principle of the Bernoulli equation. Measuring the static pressure change of each branch pipe and the flow of the corresponding branch pipe, and establishing a relational expression (P = MQ2 + N) between the static pressure of the branch pipe and the flow of the branch pipe under the constant total pressure; according to the medicine adding flow required by each branch pipe, substituting the medicine adding flow into a branch pipe static pressure and branch pipe flow relational expression, reversely calculating the static pressure value of each branch pipe under the target flow, and adjusting the static pressure of each branch pipe according to the static pressure value, so as to accurately control the actual flow of each medicine adding point; compared with a traditional one-to-one dosing pump scheme, the construction and operation cost of the dosing system can be remarkably reduced.

Description

Technical Field

[0001] The present application relates to the technical field of sewage treatment, and in particular to a one-to-many pressure dosing method and system for sewage treatment. Background Art

[0002] Wastewater treatment is a crucial component of environmental protection. Currently, my country primarily utilizes centralized treatment methods, including municipal and industrial wastewater treatment plants. Wastewater treatment typically utilizes a combination of biological methods and chemical dosing. Chemical dosing is crucial for ensuring effective treatment, and different types of wastewater require different chemical dosing to ensure optimal treatment results.

[0003] The existing sewage treatment chemical dosing system is for one-to-one dosing, and usually uses a single diaphragm pump or metering pump to dosing at one dosing point. The advantage is that the dosage of a single dosing point can be controlled and measured; the disadvantage is that the contact flow meter is affected by chemical corrosion and scaling, and the metering accuracy is reduced. When there are many dosing points, there are more dosing pumps and pipelines, which occupies a large area and has a high cost. For one-to-many dosing, a single diaphragm pump or metering pump is usually used to dosing multiple dosing points at the same time. The advantage is that it saves floor space and has a low cost. The disadvantage is that one pump can only control the dosage of multiple dosing points simply through the valves of each dosing point, and cannot accurately control the dosage of a certain point alone. The dosage deviation is large, which affects the water quality or excessive dosage increases operating costs.

[0004] Furthermore, existing one-to-many dosing systems typically utilize gravity flow for drug distribution. This involves installing elevated drug storage tanks and leveraging gravitational potential energy differences to deliver the drug to each dosing point. However, because gravity flow systems are affected by pipeline resistance and liquid level, it is difficult to accurately control the actual flow rate at each dosing point. Furthermore, interference between branch pipes can lead to uneven flow distribution, making it impossible to precisely control the flow rate of each dosing branch pipe, resulting in drug waste or insufficient dosage. This situation requires further improvement. Summary of the Invention

[0005] In order to solve the problem that there is mutual interference between the existing branches, resulting in uneven flow distribution and the inability to accurately control the flow of each dosing branch, the present application provides a one-to-many pressure dosing method and system for sewage treatment, which adopts the following technical solutions: In a first aspect, the present application provides a one-to-many pressure dosing method for sewage treatment, comprising the following steps: Measure the flow rate upper limit of multiple parallel dosing branches respectively, and establish the relationship between different total pressures and the maximum flow rate of each branch; According to the relationship between the different total pressures and the maximum flow rate of each branch pipe, an 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 the corresponding data of the static pressure P and flow rate Q of each branch pipe are obtained; Based on the corresponding data of the static pressure P and flow Q of each branch pipe, the formula P=MQ²+N is used for fitting 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 of branch pipe flow and static pressure meets the operation requirements; According to the fitting coefficient of each branch, input the target flow value required for each branch, and the system will calculate the target static pressure value corresponding to the target flow of each branch; Based on the target static pressure value of each branch, the actual static pressure value of each branch is adjusted to ensure that the actual dosing flow rate is within the input target flow rate deviation range, realizing multi-point simultaneous dosing flow control.

[0006] By adopting the above technical solution, in actual application of the existing gravity self-flow dosing system, the actual flow of each branch pipe will fluctuate due to the influence of multiple factors such as pipeline resistance and liquid level height. For example, in the actual operation of a sewage treatment plant, even if the opening of each branch valve is adjusted to the same value, the actual flow of each dosing point may still differ by more than 30%, resulting in excessive dosage of medicine at some dosing points and insufficient dosage at other dosing points. The present application sets different total pressure values and measures the flow upper limit of multiple parallel dosing branches respectively to obtain the actual flow range of each dosing branch when it is fully open. By establishing the relationship between different total pressures and the maximum flow of each branch pipe, the required dosing flow rate is input, and the maximum value of the continuous intersection of the total pressure range of each branch pipe can be determined to obtain the optimal total pressure setting value. After determining the total pressure setting value, the principle of the Bernoulli equation is used to measure the static pressure change of each branch pipe and the corresponding branch flow rate, and establish the relationship between the branch static pressure and the branch flow rate under constant total pressure (P=MQ 2 +N); Based on the dosing flow rate required by each branch, the branch static pressure and branch flow rate are substituted into the relationship between the branch static pressure and branch flow rate to reversely calculate the static pressure value of each branch at the target flow rate. The static pressure of the branch is then adjusted accordingly to achieve precise control of the actual flow rate at each dosing point. Compared with the traditional one-to-one dosing pump solution, this can significantly reduce the construction and operation costs of the dosing system.

[0007] Optionally, the method further comprises the following steps: The actual flow rate of each branch pipe is measured by a flow measuring device to obtain actual flow data; Based on 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 is corrected respectively 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, so as to calibrate the deviation rate.

[0008] By adopting the above technical solution, since the viscosity, temperature and other physical parameters of the reagents will change over time during the sewage treatment process, and scaling, blockage and other conditions may occur in the pipeline, even if the target static pressure value is set according to the above method, the actual flow of each branch may still deviate; this application installs a flow measuring device at the end of each branch to regularly collect the actual flow data of each branch; the collected actual flow is compared with the set target flow, and the deviation percentage |A%| is calculated; then, the proportional correction principle is applied to correct the original target static pressure value P0 through the formula P1=P0*(1±|A%|), where a minus sign is taken when the actual flow is greater than the target flow, and a plus sign is taken otherwise; finally, this calibration process is repeated until the flow deviation of each branch is reduced to a preset range; not only can flow deviations be discovered and corrected in a timely manner, but pipeline abnormalities can also be discovered by recording the correction data, effectively preventing various operational failures.

[0009] Optionally, the flow rate upper limit of multiple parallel dosing branches is measured respectively to establish a relationship between different total pressures and the maximum flow rate of each branch, which specifically includes the following steps: Set different total pressure values to obtain the actual flow range corresponding to each dosing branch pipe fully open state under different total pressure values; The actual flow range of each dosing branch pipe in the fully open state is calibrated to establish the relationship between different total pressures and the maximum flow of each branch pipe.

[0010] By adopting the above technical solution, the present application first sets multiple different total pressure values in the dosing system and sets the opening of each dosing branch regulating valve to a fully open state; then, at each set total pressure value, the actual flow data of each branch is measured and recorded respectively to obtain the flow change range of each branch under different total pressures; then the measured flow data is systematically calibrated; finally, the processed data is organized into a standardized relationship comparison table between the total pressure and the maximum flow of each branch, which serves as the basic parameter for subsequent precise dosing control.

[0011] Optionally, based on the relationship between the different total pressures and the maximum flow rate of each branch, an optimal total pressure setting value is obtained, the static pressure of each dosing branch is changed under the optimal total pressure setting value, the dosing process is performed under different static pressures, and corresponding data of the static pressure P and flow rate Q of each branch are obtained, which specifically includes the following steps: Obtain the calibrated total pressure range under the working status of each branch pipe; 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 of the total pressure intervals of each branch pipe is determined to obtain the optimal total pressure setting value; Under the optimal total pressure setting value, multiple groups of different static pressure values are set in sequence 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.

[0012] By adopting the above technical solution, the present application first obtains the total pressure range of each branch pipe under normal working conditions, and the range of this range is determined by the total pressure-maximum flow relationship table calibrated in the early stage; then the total pressure range of each branch pipe is analyzed, the continuous intersection of these intervals is found, and the maximum value of the intersection interval is taken as the optimal total pressure setting value of the system to ensure that all branches can operate within the optimal pressure range; then, under the determined optimal total pressure setting value, multiple groups of different static pressure values are set, and the corresponding branch pipe static pressure and flow data are collected to obtain the corresponding data of the static pressure P and flow Q of the branch pipe.

[0013] Optionally, calibrating the deviation rate specifically includes the following steps: According to the corrected target static pressure value, the actual flow of each branch is measured by the flow measuring device to obtain new actual flow data; Calculating a calibrated deviation rate based on a comparison between the new actual flow rate data and the target flow rate; Determine whether the deviation rate after calibration exceeds a first preset threshold value, and if so, determine whether it exceeds a second preset threshold value; if so, obtain an excessive deviation alarm signal, and if not, perform the first flow calibration; When the deviation rate after calibration exceeds the first preset threshold, it is determined whether it exceeds the second preset threshold; if it exceeds, an excessive deviation alarm signal is obtained; if it does not exceed, a second flow calibration is performed; After multiple rounds of calibration, the calibration is stopped until the deviation rate is less than the first preset threshold, or until the cumulative total deviation rate of each round of calibration is greater than the second preset threshold, an alarm signal is issued.

[0014] By adopting the above technical solution, the present application first adjusts the system operation according to the corrected target static pressure value, and collects the actual flow data of each branch through the flow measuring device; then compares the collected actual flow with the set target flow, and calculates the current flow deviation rate; then compares the deviation rate with the pre-set 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 directly issues an alarm signal of excessive deviation, prompting the operator to check; if the deviation rate is between the two thresholds, the system automatically starts the first flow calibration procedure, and compensates 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 repeat multiple rounds of calibration until the deviation rate drops below the first threshold, or the accumulated deviation exceeds the second threshold and an alarm signal is issued.

[0015] Optionally, the method further comprises the following steps: Record the initial static pressure value of the dosing branch pipe to obtain the initial pressure value; During multiple consecutive dosing cycles, the static pressure value of the pipeline after calibration is recorded in each cycle to obtain the cumulative pressure change data; According to the accumulated 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 accumulated pressure deviation exceeds a range is determined.

[0016] By adopting the above technical solution, since scaling, blockage, corrosion and other problems in the pipeline are often a gradual accumulation process, if only focusing on a single flow deviation, the gradual deterioration of system performance may not be discovered in time; this application first records the initial static pressure value of each branch when the system is operating normally as the baseline data; then, in multiple consecutive dosing cycles, the static pressure value of the pipeline after the flow calibration is completed in each cycle is recorded separately to form a set of data sequences reflecting the pressure change trend; finally, the most recently recorded pressure value is compared with the initial pressure value. When the deviation rate exceeds the preset adjustable threshold (such as 15%), the system will issue an alarm signal that the cumulative pressure deviation exceeds the range; through this continuous pressure trend analysis, the gradual abnormality of the pipeline system can be effectively identified, providing a decision-making basis for preventive maintenance, thereby reducing the risk of equipment failure and extending the service life of the system.

[0017] Optionally, the flow measuring device includes a constant volume container, a non-contact water flow indicator switch provided on the water inlet and outlet pipes of the constant volume container, and a switching valve connected to the dosing branch pipe. Measuring the actual flow of each branch pipe by the flow measuring device specifically includes the following steps: Switch the switching valve of the dosing branch pipe to the flow calibration pipeline; The non-contact water flow indicator switch records the time difference before and after the liquid medicine passes through the constant volume container; The actual dosing flow rate is calculated based on the time difference and the fixed volume of the constant volume container; Switch the switching valve of the dosing branch pipe back to the dosing pipeline and open the vent valve of the flow measuring device.

[0018] By adopting the above technical solution, since the flocculants, coagulants and other chemicals commonly used in sewage treatment have the characteristics of high viscosity and easy crystallization, traditional flow meters are prone to measurement errors and are prone to clogging after long-term use; the present application first switches the switching valve to the flow calibration pipeline to allow the drug solution to enter the constant volume container; when the drug solution flows through the constant volume container, the time points when the drug solution arrives at the inlet and outlet are recorded respectively by the non-contact water flow indicator switches of the inlet and outlet pipes to obtain the time difference △t; then, according to the known volume V of the constant volume container and the measured time difference △t, the actual flow rate is calculated by the formula Q=V / △t; 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 drug solution in the constant volume container; through this non-contact constant volume measurement method, not only can the measurement error caused by scaling be avoided, but also because a fixed volume is used as a benchmark, the measurement results are more reliable, and the equipment maintenance cost is also greatly reduced.

[0019] In a second aspect, the present application provides a one-to-many pressure dosing system for sewage treatment, comprising: A module for obtaining the relationship between different total pressures and the maximum flow of each branch is used to measure the flow upper limit of multiple parallel dosing branches and establish the relationship between different total pressures and the maximum flow of each branch; A static pressure and flow corresponding data acquisition module is used to obtain an optimal total pressure setting value based on the relationship between the different total pressures and the maximum flow 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 the static pressure P and flow Q of each branch pipe; The branch pipe fitting coefficient acquisition module is used to fit the corresponding data of the static pressure P and flow 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 branch pipe flow and static pressure correlation coefficient meets the operation requirements; The target static pressure value calculation module is used to input the target flow value required by each branch according to the fitting coefficient of each branch, and the system calculates the target static pressure value corresponding to the target flow of each branch; 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 to ensure that the actual dosing flow rate is within the input target flow rate deviation range, thereby realizing multi-point simultaneous dosing flow control.

[0020] In a third aspect, the present application provides an electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the steps of the one-to-many pressure dosing method for sewage treatment are implemented.

[0021] In a fourth aspect, the present 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-mentioned one-to-many pressure dosing method for sewage treatment.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. This application sets different total pressure values to measure the flow rate upper limit of multiple parallel dosing branches, obtaining the actual flow rate range of each dosing branch when fully open. Furthermore, by establishing a relationship between different total pressures and the maximum flow rate of each branch, the required dosing flow rate can be input to determine the maximum value of the continuous intersection of the total pressure ranges of each branch, thereby obtaining the optimal total pressure setting value. After determining the total pressure setting value, the principle of the Bernoulli equation is used to measure the static pressure change of each branch and the corresponding branch flow rate, and to establish the relationship between the branch static pressure and the branch flow rate under constant total pressure (P = MQ 2 +N); Based on the required dosing flow rate of each branch pipe, the branch pipe static pressure and branch pipe flow rate are substituted into the relationship formula to reversely calculate the static pressure value of each branch pipe at the target flow rate. The static pressure of the branch pipe is adjusted accordingly to achieve precise control of the actual flow rate of each dosing point. Compared with the traditional one-to-one dosing pump solution, this can significantly reduce the construction and operation costs of the dosing system; 2. This application installs a flow meter at the end of each branch pipe to regularly collect actual flow data from 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 the value is subtracted when the actual flow rate exceeds the target flow rate and plus when it does not. Finally, this calibration process is repeated until the flow deviation of each branch pipe is reduced to within a preset range. This not only enables timely detection and correction of flow deviations, but also allows pipeline anomalies to be detected by recording the corrected data, effectively preventing various operational failures. 3. This application first obtains the total pressure range of each branch pipe under normal working conditions. The range of this range is determined by the total pressure-maximum flow relationship table calibrated in the early stage; then the total pressure range of each branch pipe is analyzed, the continuous intersection of these ranges is found, and the maximum value of the intersection range is taken as the optimal total pressure setting value of the system to ensure that all branches can operate within the optimal pressure range; then, under the determined optimal total pressure setting value, multiple groups of different static pressure values are set, and the corresponding branch pipe static pressure and flow data are collected to obtain the corresponding data of the branch pipe static pressure P and flow Q. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a flow chart of a one-to-many pressure dosing method for sewage treatment according to an embodiment of the present application; Figure 2 This is a schematic diagram of a process for calibrating deviations in a one-to-many pressure dosing method for sewage treatment according to an embodiment of the present application; Figure 3 This is a flow chart of step S110 in a one-to-many pressure dosing method for sewage treatment according to an embodiment of the present application; Figure 4 This is a flow chart of step S120 in a one-to-many pressure dosing method for sewage treatment according to an embodiment of the present application; Figure 5 This is a flow chart of step S210 in a one-to-many pressure dosing method for sewage treatment according to an embodiment of the present application; Figure 6 This is a flow chart of step S230 in a one-to-many pressure dosing method for sewage treatment according to an embodiment of the present application; Figure 7 This is a flow chart of calculating the cumulative pressure deviation in a one-to-many pressure dosing method for sewage treatment according to an embodiment of the present application; Figure 8 This is a module diagram of a one-to-many pressure dosing system for sewage treatment according to an embodiment of the present application; Figure 9 This is a diagram of the internal structure of an electronic device according to an embodiment of the present application. DETAILED DESCRIPTION

[0024] The terms used in the following examples of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the specification and appended claims of this application, the singular expressions "a," "an," "said," "above," "the," and "this" are intended to include plural expressions as well, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used in this application refers to any or all possible combinations comprising one or more of the listed items.

[0025] In the following, the terms "first" and "second" are used for descriptive purposes only and should not be understood to imply or suggest relative importance or implicitly indicate the number of the technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of this application, unless otherwise specified, "plurality" means two or more.

[0026] The embodiments of the present application are described in further detail below with reference to the accompanying drawings.

[0027] In the first aspect, the present application provides a one-to-many pressure dosing method for sewage treatment, referring to Figure 1 , including the following steps: S110, measuring the flow upper limit of multiple parallel dosing branches respectively, and establishing the relationship between different total pressures and the maximum flow of each branch.

[0028] Specifically, during the calibration process, different total pressure values are set and the actual flow rate corresponding to each branch pipe in the fully open state is measured and recorded. The data collected by the system is used to establish a standardized total pressure-maximum flow rate relationship table for each branch pipe, providing basic parameters for subsequent control.

[0029] S120. Obtain an 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 corresponding data of the static pressure P and flow rate Q of each branch pipe.

[0030] S130. Based on the corresponding data of the static pressure P and the flow rate Q of each branch pipe, the formula P=MQ²+N is used for fitting to obtain the fitting coefficients M and N of each branch pipe.

[0031] Specifically, to establish an accurate branch pipe control model, the measured pressure-flow data requires mathematical processing. Based on the principles of fluid mechanics, a quadratic equation, P=MQ²+N, is used for fitting, where P is the static pressure, Q is the flow rate, and M and N are undetermined coefficients. Each set of test data is fitted using the least squares method 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 so, the parameters M and N are recorded and calibration is completed. Otherwise, a recalibration prompt is prompted.

[0032] S140 , according to the fitting coefficient of each branch, the target flow value required for each branch is input, and the system calculates the target static pressure value corresponding to the target flow of each branch.

[0033] Specifically, the target flow rate value required by the process is substituted into the characteristic equation P=MQ²+N to calculate the target static pressure value required to achieve the flow rate.

[0034] S150 , based on the target static pressure value of each branch pipe, adjusting the actual static pressure value of each branch pipe to ensure that the actual dosing flow rate is within the input target flow rate deviation range, thereby achieving multi-point simultaneous dosing flow control.

[0035] In this embodiment, the target flow rate refers to the set flow rate of each branch pipe 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 refers to the degree of opening of the regulating valve, expressed as a percentage.

[0036] Specifically, in actual operation, the target flow rate for each branch is first determined based on process requirements. This target flow rate is then substituted into the characteristic equation for the corresponding branch to calculate the target static pressure. The actual static pressure of each branch is then adjusted, for example, by adjusting the valve opening of the branch to achieve the calculated value. This process is performed simultaneously for all branches, achieving multi-point coordinated dosing.

[0037] In one embodiment, referring to Figure 2 , the method further comprises the steps of: S210. Measure the actual flow of each branch pipe using a flow measuring device to obtain actual flow data.

[0038] 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 measured by the flow measurement device; the target flow refers to the dosing amount of each branch set by the process.

[0039] Specifically, this embodiment uses an independent flow calibration method to verify system accuracy. A bypass structure is installed at the outlet of each branch pipe, and valves are switched to direct the liquid medicine into the calibration device. Once the system is operating stably, flow measurements are taken for each branch pipe in turn, eliminating the maintenance challenges of online flow meters while ensuring the reliability of measurement results.

[0040] It is understandable that the calibration start conditions need to be met during calibration, among which the calibration start conditions refer to the prerequisites that need to be met for the system to enter the calibration mode; the H value of the liquid level in the dosing tank refers to the minimum liquid level requirement of the liquid when performing the calibration. Specifically, the system has established a calibration condition judgment mechanism. Create a calibration condition checklist that includes key parameters such as dosing status and liquid level value. When the operator clicks the branch pipe calibration button, the system automatically checks whether it is currently in the dosing step or whether the liquid level is higher than the preset H value. The calibration process is only allowed to start if the conditions are met. This conditional prejudgment can avoid abnormal situations such as insufficient liquid during the calibration process.

[0041] S220. Based on the comparison between the actual flow data and the target flow, the deviation rate |A%| of each branch pipe is calculated.

[0042] 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 the process requirements.

[0043] Specifically, the system uses a data comparison method to calculate flow deviation. First, a basic data table is created, containing the branch number, target flow, and measured flow. The deviation rate for each branch is calculated using the formula |A%| = |(measured flow - target flow) / target flow| × 100%.

[0044] S230. Based on the deviation rate, the target static pressure value of each branch pipe is corrected using the formula P1=P0*(1±|A%|).

[0045] Among them, P1 is the corrected target static pressure value, and P0 is the original target static pressure value.

[0046] The corrected target static pressure value P1 in this embodiment refers to the new pressure setting value obtained by calculating the deviation; the original target static pressure value P0 refers to the pressure setting value currently used; 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.

[0047] Specifically, the system has established a pressure correction mechanism. When the actual flow rate is too high, the pressure setting value is lowered by a reduction factor (1-|A%|); when the actual flow rate is too low, the pressure setting value is increased by an increase factor (1+|A%|) to calibrate the deviation rate.

[0048] In one embodiment, referring to Figure 3 In step S110, the flow rate upper limit of multiple parallel dosing branches is measured respectively, and the relationship between different total pressures and the maximum flow rate of each branch is established, which specifically includes the following steps: S111. Setting different total pressure values to obtain the actual flow rate range corresponding to each dosing branch pipe in a fully open state under different total pressure values.

[0049] S112. Calibrate the actual flow range of each dosing branch pipe when it is fully open, and establish the relationship between different total pressures and the maximum flow rate of each branch pipe.

[0050] In one embodiment, referring to Figure 4 In step S120, 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, 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 the corresponding data of the static pressure P and flow rate Q of each branch pipe are obtained. Specifically, the steps include: S121. Obtain the total pressure range calibrated under the working state of each branch pipe.

[0051] Specifically, based on the relationship between the different total pressures and the maximum flow rates of each branch established in step S110, the flow rate of each branch is analyzed as it changes with total pressure. The pressure range within which the flow rate of each branch changes steadily and meets process requirements is determined as the effective operating pressure range for that branch. For example, the operating pressure range for branch A is 2.5-4.0 bar, and for branch B is 3.0-4.5 bar, etc.

[0052] S122. Determine the maximum value of the continuous intersection of the total pressure intervals of each branch pipe according to the relationship between the different total pressures and the maximum flow of each branch pipe and the total pressure interval, and obtain the optimal total pressure setting value.

[0053] Specifically, the operating pressure ranges of all branch pipes are superimposed and analyzed to identify the common overlap between these ranges. The maximum value within this overlap is selected as the optimal total pressure setting for the system. This ensures that all branch pipes operate within their respective effective pressure ranges while maintaining sufficient regulation margin.

[0054] It is worth noting that this application is applicable to working conditions where the flow ranges of multiple branches are not much different. If there is a situation where the total pressure ranges between the branches do not intersect, a larger total pressure is selected according to a branch with large flow, and the valve opening needs to be adjusted to a very small value for the branch with small flow. This working condition increases the difficulty of adjustment for the branch with small flow, and the operation is not economical.

[0055] S123. Under the optimal total pressure setting value, each dosing branch pipe is sequentially set with multiple groups of different static pressure values, and corresponding branch pipe static pressure and flow rate data are collected to obtain corresponding data of the branch pipe static pressure P and flow rate Q.

[0056] Specifically, the total system pressure is set as the optimal pressure parameter, and different static pressure values are set at uniform intervals. For example, a regulating valve opening sequence is set, and the setting intervals of each opening point are uniform, which facilitates subsequent data processing and model establishment. The static pressure and flow data of the branch pipe are collected simultaneously at each opening point.

[0057] In one embodiment, the flow measuring device includes a constant volume container, a non-contact water flow indicator switch provided on the water inlet and outlet pipes of the constant volume container, and a switching valve connected to the dosing branch pipe. Figure 5 In step S210, the actual flow rate of each branch is measured by a flow measuring device, which specifically includes the following steps: S211. Switch the dosing branch pipe switching valve to the flow calibration pipeline.

[0058] In this embodiment, the switching valve can realize the conversion of the flow direction of the liquid medicine; the flow calibration pipeline refers to a bypass system for measuring the flow rate, including a liquid inlet pipeline, a constant volume container and a liquid outlet pipeline.

[0059] Specifically, the system employs a flow direction switching solution. A valve state mapping table is established, defining two operating positions for the switching valve: the dosing position and the calibration position. When flow measurement is required, the control system automatically executes the switching command based on the mapping table, directing the liquid medicine into the calibration line. Manual switching is also possible.

[0060] S212. Record the time difference before and after the liquid medicine passes through the constant volume container through a non-contact water flow indicator switch.

[0061] 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 photoelectric or ultrasonic means; the time difference refers to the time interval between the liquid passing through the two switches in sequence.

[0062] Specifically, a timer starts when the liquid 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, extending the life of the device.

[0063] S213. Calculate the actual dosing flow rate based on the time difference and the fixed volume of the constant volume container.

[0064] In this embodiment, the constant volume container refers to a measuring container with a fixed volume; the actual dosing flow rate refers to the flow rate of the liquid medicine calculated by volume and time difference.

[0065] Specifically, the system established a flow calculation model based on the constant volume method. A flow calculation table was designed, incorporating parameters such as vessel volume, time difference, and temperature. The system automatically calculated the actual flow rate using the formula Q = V / ΔT (where V is the vessel volume and ΔT is the time difference).

[0066] S214, switch the switching valve of the dosing branch pipe back to the dosing pipeline, and open the vent valve of the flow measuring device.

[0067] In this embodiment, the vent valve refers to a discharge valve used to empty the constant volume container; the dosing pipeline refers to a liquid medicine delivery pipeline during normal dosing.

[0068] Specifically, the system uses an automated post-measurement processing process. It establishes a device status recovery table containing information such as the switching valve position and the vent valve status. After the measurement is completed, the control system first returns the switching valve to the dosing position and then opens the vent valve to drain the liquid from the constant volume container to the dosing point. This automated processing ensures the continuity of the measurement process while avoiding waste of liquid medicine.

[0069] In one embodiment, referring to Figure 6 In step S230, the deviation rate is calibrated, which specifically includes the following steps: S231. Based on the corrected target static pressure value, the actual flow rate of each branch pipe is measured by a flow measuring device to obtain new actual flow rate data.

[0070] In this embodiment, the new actual flow data refers to the flow value measured when the corrected pressure value is used; the corrected target static pressure value refers to the pressure setting value calculated based on the previous deviation.

[0071] S232. Calculate the calibrated deviation rate based on the comparison between the new actual flow rate data and the target flow rate.

[0072] S233. Determine whether the deviation rate after calibration exceeds the first preset threshold. If so, determine whether it exceeds the second preset threshold. If so, obtain an excessive deviation alarm signal. If not, perform the first flow calibration.

[0073] The calibrated deviation rate in this embodiment 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%.

[0074] Specifically, the system uses a data comparison method to create a deviation calculation table containing data such as target flow, measured flow, and deviation rate. A new deviation rate is calculated using the formula |(measured flow - target flow) / target flow| × 100% and the result is stored in a database for trend analysis.

[0075] S234. When the deviation rate after calibration exceeds the first preset threshold, determine whether it exceeds the second preset threshold; if so, obtain an excessive deviation alarm signal; if not, perform a second flow calibration.

[0076] In this embodiment, the second flow calibration refers to the review process when the deviation after the first calibration is still within the range of 5%-15%; the calibration result refers to the flow control effect finally achieved.

[0077] S235. After multiple rounds of calibration, the calibration is stopped until the deviation rate is less than the first preset threshold, or until the cumulative total deviation rate of each round of calibration is greater than the second preset threshold, an alarm signal is issued.

[0078] Specifically, after multiple rounds of calibration, if the deviation rate is less than a first preset threshold, the calibration is stopped. Alternatively, if the cumulative deviation rate of each round of calibration is greater than a second preset threshold after multiple rounds of calibration, an alarm signal is issued.

[0079] In one embodiment, referring to Figure 7 , the method further comprises the steps of: S710: Record the initial static pressure value of the dosing branch pipe to obtain the initial pressure value.

[0080] In this embodiment, the initial pressure value P0 refers to the reference static pressure when the branch pipe starts to operate; the static pressure value refers to the actual pressure reading in the pipeline without dynamic pressure.

[0081] Specifically, the system establishes a pressure baseline recording mechanism. A pressure baseline table is designed to record the static pressure value of the equipment in a stable operating state at the beginning of each dosing batch as the initial value P0. This baseline value provides a reference standard for subsequent pressure deviation monitoring.

[0082] S720. During a plurality of consecutive dosing cycles, the static pressure value of the pipeline after calibration is recorded in each cycle to obtain cumulative pressure change data.

[0083] In this embodiment, the dosing cycle refers to a complete dosing process, including flow calibration and pressure adjustment steps; the accumulated pressure change data refers to a sequence of pressure values P1, P2, and P3 obtained after multiple consecutive calibrations.

[0084] Specifically, the system employs a cycle tracking strategy. A pressure change tracking table is created, recording the final stable static pressure value after each dosing cycle. The pressure change is calculated using the formula Pi = Pi - 1 × (1 ± δi%), where δi% is the correction factor for the i-th calibration. This continuous recording method can reflect the changing trend of pressure values.

[0085] S730: Based on the accumulated 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 accumulated pressure deviation exceeds a range is determined.

[0086] In this embodiment, the preset adjustable threshold value X% refers to the maximum allowable cumulative pressure deviation, which is initially set to 15%; the cumulative pressure deviation out of range means that the cumulative change of the pressure value after multiple calibrations exceeds the allowable range.

[0087] Specifically, the system has designed a cumulative deviation monitoring solution. A pressure deviation analysis table is created, and the cumulative deviation rate is calculated using the comparison formula |(P3 - P0) / P0| × 100%. When the deviation rate exceeds a set threshold of X%, the system automatically issues an alarm, indicating a possible pipeline blockage or leak. This cumulative deviation monitoring mechanism promptly identifies system anomalies and prevents equipment from operating with problems.

[0088] Furthermore, the present application issues a warning message of pipe blockage or leakage when the system detects an abnormality. Pipe blockage or leakage refers to typical fault types that may cause pressure abnormality.

[0089] Specifically, the system has established a fault early warning and handling mechanism. A fault type comparison table is designed to correlate different pressure variation characteristics with possible fault types. When the system issues a cumulative pressure deviation alarm, operators can use the comparison table to quickly locate the possible cause of the fault and conduct timely inspection and maintenance. This fault early warning mechanism effectively improves equipment maintenance efficiency.

[0090] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean 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.

[0091] Secondly, the present application provides a one-to-many pressure dosing system for sewage treatment. The one-to-many pressure dosing system for sewage treatment of the present application is described below in combination with the above-mentioned one-to-many pressure dosing method for sewage treatment.

[0092] Reference Figure 8 , a one-to-many pressure dosing system for sewage treatment, comprising: A module for obtaining the relationship between different total pressures and the maximum flow of each branch is used to measure the flow upper limit of multiple parallel dosing branches and establish the relationship between different total pressures and the maximum flow of each branch; A static pressure and flow corresponding data acquisition module is used to obtain an optimal total pressure setting value based on the relationship between the different total pressures and the maximum flow 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 the static pressure P and flow Q of each branch pipe; The branch pipe fitting coefficient acquisition module is used to fit the corresponding data of the static pressure P and flow 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 branch pipe flow and static pressure correlation coefficient meets the operation requirements; The target static pressure value calculation module is used to input the target flow value required by each branch according to the fitting coefficient of each branch, and the system calculates the target static pressure value corresponding to the target flow of each branch; 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 to ensure that the actual dosing flow rate is within the input target flow rate deviation range, thereby realizing multi-point simultaneous dosing flow control.

[0093] In one embodiment, the present application provides an electronic device, which may be a server, and its internal structure diagram may be as follows: Figure 9As shown. The electronic device includes a processor, a memory and a network interface connected via a system bus. The processor of the electronic device is used to provide computing and control capabilities. The memory of the electronic device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the electronic device is used to store data. The network interface of the electronic device is used to communicate with an external terminal via a network connection. When the computer program is executed by the processor, a one-to-many pressure dosing method for sewage treatment is implemented.

[0094] Those skilled in the art will understand that Figure 9 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the electronic device to which the solution of the present application is applied. The specific electronic device may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0095] In one embodiment, an electronic device is further provided, including a memory and a processor. The memory stores a computer program, and the processor implements the steps in the above method embodiments when executing the computer program.

[0096] Those skilled in the art will appreciate that all or part of the processes in the above-described method embodiments can be implemented by instructing the relevant hardware through a computer program. The above-described computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the above-described method embodiments. Any reference to memory, storage, database, or other media used in the embodiments provided herein may include at least one of non-volatile and volatile memory. Non-volatile memory may include read-only memory (ROM), magnetic tape, floppy disk, flash memory, or optical storage. Volatile memory may 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).

[0097] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A one-to-many pressure dosing method for sewage treatment, characterized in that: The steps include: Measure the flow rate upper limit of multiple parallel dosing branches respectively, and establish the relationship between different total pressures and the maximum flow rate of each branch; According to the relationship between the different total pressures and the maximum flow rate of each branch pipe, an 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 the corresponding data of the static pressure P and flow rate Q of each branch pipe are obtained; Based on the corresponding data of the static pressure P and flow Q of each branch pipe, the formula P=MQ²+N is used for fitting 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 of branch pipe flow and static pressure meets the operation requirements; According to the fitting coefficient of each branch, input the target flow value required for each branch, and the system will calculate the target static pressure value corresponding to the target flow of each branch; Based on the target static pressure value of each branch, the actual static pressure value of each branch is adjusted to ensure that the actual dosing flow rate is within the input target flow rate deviation range, realizing multi-point simultaneous dosing flow control.

2. The one-to-many pressure dosing method for sewage treatment according to claim 1, characterized in that: The method further comprises the steps of: The actual flow rate of each branch pipe is measured by a flow measuring device to obtain actual flow data; Based on 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 is corrected respectively 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, so as to calibrate the deviation rate.

3. The one-to-many pressure dosing method for sewage treatment according to claim 1, characterized in that: The flow rate upper limit of multiple parallel dosing branches is measured respectively, and the relationship between different total pressures and the maximum flow rate of each branch is established. The specific steps include the following: Set different total pressure values to obtain the actual flow range corresponding to each dosing branch pipe fully open state under different total pressure values; The actual flow range of each dosing branch pipe in the fully open state is calibrated to establish the relationship between different total pressures and the maximum flow of each branch pipe.

4. The one-to-many pressure dosing method for sewage treatment according to claim 3, characterized in that: According to the relationship between the different total pressures and the maximum flow of each branch pipe, an 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 the corresponding data of the static pressure P and flow Q of each branch pipe are obtained, which specifically includes the following steps: Obtain the calibrated total pressure range under the working status of each branch pipe; 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 of the total pressure intervals of each branch pipe is determined to obtain the optimal total pressure setting value; Under the optimal total pressure setting value, multiple groups of different static pressure values are set in sequence 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.

5. The one-to-many pressure dosing method for sewage treatment according to claim 2, characterized in that: Calibrating the deviation rate specifically includes the following steps: According to the corrected target static pressure value, the actual flow of each branch is measured by the flow measuring device to obtain new actual flow data; Calculating a calibrated deviation rate based on a comparison between the new actual flow rate data and the target flow rate; determining whether the calibrated deviation rate exceeds a first preset threshold, and if so, determining whether it exceeds a second preset threshold; If it exceeds, an excessive deviation alarm signal is obtained, and if it does not exceed, the first flow calibration is performed; When the calibrated deviation rate exceeds a first preset threshold, determining whether it exceeds a second preset threshold; If it exceeds, an excessive deviation alarm signal is obtained; if it does not exceed, a second flow calibration is performed; After multiple rounds of calibration, the calibration is stopped until the deviation rate is less than the first preset threshold, or until the cumulative total deviation rate of each round of calibration is greater than the second preset threshold, an alarm signal is issued.

6. The one-to-many pressure dosing method for sewage treatment according to claim 5, characterized in that: The method further comprises the steps of: Record the initial static pressure value of the dosing branch pipe to obtain the initial pressure value; During multiple consecutive dosing cycles, the static pressure value of the pipeline after calibration is recorded in each cycle to obtain the cumulative pressure change data; According to the accumulated 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 accumulated pressure deviation exceeds a range is determined.

7. The one-to-many pressure dosing method for sewage treatment according to claim 2, characterized in that: The flow measuring device includes a constant volume container, a non-contact water flow indicator switch provided on the water inlet and outlet pipes of the constant volume container, and a switching valve connected to the dosing branch pipe. The actual flow of each branch pipe is measured by the flow measuring device, specifically including the following steps: Switch the switching valve of the dosing branch pipe to the flow calibration pipeline; The non-contact water flow indicator switch records the time difference before and after the liquid medicine passes through the constant volume container; The actual dosing flow rate is calculated based on the time difference and the fixed volume of the constant volume container; Switch the switching valve of the dosing branch pipe back to the dosing pipeline and open the vent valve of the flow measuring device.

8. A one-to-many pressure dosing system for sewage treatment, characterized in that: include: A module for obtaining the relationship between different total pressures and the maximum flow of each branch is used to measure the flow upper limit of multiple parallel dosing branches and establish the relationship between different total pressures and the maximum flow of each branch; A static pressure and flow corresponding data acquisition module is used to obtain an optimal total pressure setting value based on the relationship between the different total pressures and the maximum flow 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 the static pressure P and flow Q of each branch pipe; The branch pipe fitting coefficient acquisition module is used to fit the corresponding data of the static pressure P and flow 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 branch pipe flow and static pressure correlation coefficient meets the operation requirements; The target static pressure value calculation module is used to input the target flow value required by each branch according to the fitting coefficient of each branch, and the system calculates the target static pressure value corresponding to the target flow of each branch; 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 to ensure that the actual dosing flow rate is within the input target flow rate deviation range, thereby realizing multi-point simultaneous dosing flow control.

9. An electronic device, characterized in that: The method comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the steps of the one-to-many pressure dosing method for sewage treatment according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the one-to-many pressure dosing method for sewage treatment according to any one of claims 1 to 7 are implemented.

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