Desulfurization slurry supply control method and system

Abstract

The invention provides a desulfurization slurry supply control method and system, and the method comprises the steps: obtaining process parameters of a desulfurization system in real time, the process parameters comprising an absorption tower inlet sulfur dioxide concentration, a unit load, a slurry density and a PH measurement value; dynamically calculating the real-time demand supply quantity of the limestone slurry based on the process parameters; judging a preset load range to which the unit load belongs; selecting a control strategy according to the judgment result of the preset load range; when the unit load is lower than a first threshold value, preferentially adjusting the opening degree of a slurry supply control valve and limiting the frequency change range of a slurry supply pump; when the unit load is higher than a second threshold value, the slurry supply pump frequency and the slurry supply control valve opening degree are synchronously and coordinately controlled, so that the slurry supply quantity is matched with the real-time required supply quantity; in the matching process, the state parameters of the slurry supply system are continuously monitored, the corresponding protection action is triggered when it is detected that the state parameters of the slurry supply system are abnormal, and the defect that the supply accuracy of the desulfurization slurry is poor due to the hysteresis of artificial experience is effectively overcome.

Description

Technical Field

[0001] This invention relates to the field of desulfurization slurry supply control technology, and in particular to a desulfurization slurry supply control method and system. Background Technology

[0002] In existing desulfurization systems of thermal power plants, the control of the pH value of the absorber slurry generally relies on manual adjustment based on the experience of operators. This manual operation method has significant lag and is difficult to cope with real-time fluctuations in process conditions such as inlet sulfur dioxide concentration and unit load, resulting in unstable desulfurization efficiency and difficulty in consistently meeting environmental emission standards. At the same time, frequent manual intervention not only increases the workload but also fails to achieve precise adjustment of the slurry supply, leading to energy waste and equipment wear and tear.

[0003] Therefore, how to overcome the lag of manual operation and achieve rapid and precise adjustment of slurry supply has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] This invention provides a desulfurization slurry supply control method and system to solve the defects of existing technologies where manual pH adjustment has a lag, resulting in poor accuracy of desulfurization slurry supply.

[0005] In a first aspect, the present invention provides a method for controlling the supply of desulfurization slurry, comprising:

[0006] The process parameters of the desulfurization system are acquired in real time, including the sulfur dioxide concentration at the inlet of the absorption tower, the unit load, the slurry density, and the pH value.

[0007] Based on the process parameters, the real-time demand and supply of limestone slurry are dynamically calculated.

[0008] Determine the preset load range to which the unit load belongs;

[0009] Based on the judgment result of the preset load range, the control strategy is selected as follows: when the unit load is lower than the first threshold, the opening of the slurry supply valve is adjusted first and the frequency variation range of the slurry supply pump is limited; when the unit load is higher than the second threshold, the frequency of the slurry supply pump and the opening of the slurry supply valve are controlled synchronously and in coordination.

[0010] Execute the control instructions corresponding to the selected control strategy to match the real-time demand supply of slurry;

[0011] During the matching process, the status parameters of the slurry supply system are continuously monitored, and corresponding protection actions are triggered when abnormal status parameters of the slurry supply system are detected.

[0012] According to the desulfurization slurry supply control method provided by the present invention, the synchronous and coordinated control of the slurry pump frequency and the slurry valve opening includes:

[0013] Based on the real-time demand supply and slurry pipeline characteristic curve, calculate the reference frequency of the slurry pump and the reference opening of the slurry regulating valve.

[0014] Using the reference frequency and reference opening as initial values, a closed-loop control algorithm is adopted, with the deviation between the actual slurry flow rate and the set flow rate as feedback input, to synchronously adjust the operating frequency of the slurry pump and the opening of the slurry valve, so that the slurry supply is stabilized at the real-time demand supply.

[0015] According to a desulfurization slurry supply control method provided by the present invention, the step of calculating the reference frequency of the slurry supply pump and the reference opening of the slurry supply valve based on the real-time demand supply quantity and the slurry pipeline characteristic curve includes:

[0016] Query the pre-stored mapping table of slurry pipeline characteristic curves and slurry supply volume, and match the corresponding recommended frequency value of the slurry supply pump and the recommended opening value of the slurry supply valve according to the real-time demand supply volume;

[0017] The recommended frequency value and recommended opening value are used as the initial calculated values ​​for the reference frequency and reference opening value, respectively.

[0018] According to a desulfurization slurry supply control method provided by the present invention, the method comprises using a closed-loop control algorithm with the reference frequency and reference opening degree as initial values, and using the deviation between the actual slurry flow rate and the set flow rate as feedback input to synchronously adjust the operating frequency of the slurry supply pump and the opening degree of the slurry supply valve, including:

[0019] The deviation between the actual slurry flow rate and the set flow rate is input to the PID controller, which outputs the first adjustment amount.

[0020] The first adjustment amount is simultaneously superimposed on the reference frequency and the reference opening according to a preset allocation ratio to generate the final frequency control command of the slurry pump and the final opening control command of the slurry valve.

[0021] Based on the final frequency control command and the final opening control command, the slurry pump frequency converter and the slurry regulating valve actuator are synchronously controlled.

[0022] According to the desulfurization slurry supply control method provided by the present invention, the step of dynamically calculating the real-time demand supply of limestone slurry based on the process parameters includes:

[0023] Based on the sulfur dioxide concentration at the inlet of the absorption tower, the unit load, the slurry density, and the pH measurement, the basic slurry supply is calculated using a preset limestone consumption calculation model.

[0024] By introducing the sulfur dioxide concentration change rate and the unit load change rate as feedforward compensation quantities, the basic slurry supply is dynamically corrected to generate the real-time demand supply.

[0025] According to a desulfurization slurry supply control method provided by the present invention, the step of executing the control command corresponding to the selected control strategy to match the slurry supply quantity with the real-time demand supply quantity includes:

[0026] The control commands are converted into frequency control signals for the slurry pump inverter and opening control signals for the slurry supply valve.

[0027] The frequency control signal and the opening control signal are synchronously output to the actuator to drive the slurry pump and the slurry regulating valve to operate.

[0028] Real-time monitoring of the actual slurry supply and comparison with the real-time demand supply;

[0029] Based on the comparison results, the frequency control signal and the opening control signal are dynamically adjusted through closed-loop feedback to ensure that the actual slurry supply continuously matches the real-time demand supply.

[0030] According to a desulfurization slurry supply control method provided by the present invention, the step of continuously monitoring the status parameters of the slurry supply system during the matching process and triggering corresponding protection actions when an abnormality is detected in the status parameters of the slurry supply system includes:

[0031] Real-time data collection of slurry pump current, vibration, and outlet pressure, as well as slurry pipeline flow rate and differential pressure;

[0032] The collected current, vibration, outlet pressure, flow rate, and differential pressure values ​​are compared with preset safe operating thresholds.

[0033] When any parameter value continuously exceeds the corresponding safe operation threshold for a preset duration, it is determined to be an abnormal state;

[0034] In response to the abnormal state, an audible and visual alarm is triggered and a predetermined protection action is automatically executed. The protection action includes: automatically switching to the standby slurry pump operation, and / or, executing a load reduction or shutdown protection procedure according to the type of abnormal parameter.

[0035] According to a desulfurization slurry supply control method provided by the present invention, the preset safe operation threshold is dynamically adjusted in the following manner:

[0036] Based on historical operating data and equipment operating conditions, an adaptive threshold model is established for the parameters of the slurry pump, including current, vibration, outlet pressure, flow rate, and differential pressure.

[0037] Based on real-time changes in unit load and slurry density, the safe operating thresholds corresponding to each parameter are dynamically calculated and updated through the threshold adaptive model.

[0038] According to a desulfurization slurry supply control method provided by the present invention, the automatic switching to the standby slurry pump operation includes:

[0039] When it is determined that the standby pump needs to be switched, the frequency control command of the currently running slurry pump and the opening command of the slurry valve are locked.

[0040] According to the preset switching sequence, first start the standby grout pump to the specified frequency, and then synchronously adjust the opening of the standby pipeline grout supply valve;

[0041] Once the slurry flow rate in the backup pipeline has stabilized, gradually reduce the frequency of the slurry pump in the faulty pipeline and close its slurry control valve to complete the seamless switching process.

[0042] Secondly, the present invention provides a desulfurization slurry supply control system, comprising:

[0043] The acquisition module is used to acquire process parameters of the desulfurization system in real time, including sulfur dioxide concentration at the inlet of the absorption tower, unit load, slurry density, and pH measurement value.

[0044] The calculation module is used to dynamically calculate the real-time demand and supply of limestone slurry based on the process parameters.

[0045] The judgment module is used to determine the preset load range to which the unit load belongs;

[0046] The selection module is used to select a control strategy based on the judgment result of the preset load range: when the unit load is lower than the first threshold, the opening of the slurry supply valve is adjusted first and the frequency change range of the slurry supply pump is limited; when the unit load is higher than the second threshold, the frequency of the slurry supply pump and the opening of the slurry supply valve are controlled synchronously and in coordination.

[0047] The matching module is used to execute the control instructions corresponding to the selected control strategy so that the slurry supply quantity matches the real-time demand supply quantity.

[0048] The monitoring module is used to continuously monitor the status parameters of the slurry supply system during the matching process, and to trigger corresponding protection actions when abnormal status parameters of the slurry supply system are detected.

[0049] Thirdly, the present invention also 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 program to implement the desulfurization slurry supply control method as described above.

[0050] Fourthly, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the desulfurization slurry supply control method as described above.

[0051] Fifthly, the present invention also provides a computer program product, including a computer program that, when executed by a processor, implements the desulfurization slurry supply control method as described above.

[0052] This invention provides a desulfurization slurry supply control method and system. By acquiring process parameters in real time and dynamically calculating the real-time demand for limestone slurry, it replaces the rough estimation relying on operator experience. This allows the system to respond proactively and immediately to fluctuations in process conditions, significantly reducing adjustment lag and ensuring rapid matching of slurry supply with actual demand. This provides a core guarantee for the continuous and stable operation of the desulfurization tower and compliance with emission standards. By determining the preset load range to which the unit load belongs, different control strategies are selected, achieving precise on-demand control. Furthermore, the system continuously monitors status parameters during execution and triggers protective actions in case of anomalies, greatly reducing the risk of desulfurization system shutdown or unit outage due to equipment failure, ensuring the safe and stable operation of the unit. Attached Figure Description

[0053] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0054] Figure 1 This is a flowchart illustrating the desulfurization slurry supply control method provided in this embodiment;

[0055] Figure 2 This is a schematic diagram of the desulfurization slurry supply control system provided in this embodiment;

[0056] Figure 3 This is a schematic diagram of the structure of the electronic device provided in this embodiment. Detailed Implementation

[0057] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0058] Figure 1 This is a flowchart illustrating the desulfurization slurry supply control method provided in this embodiment.

[0059] like Figure 1 As shown, the desulfurization slurry supply control method provided in this embodiment of the invention mainly includes the following steps:

[0060] 101. Real-time acquisition of process parameters of the desulfurization system, including sulfur dioxide concentration at the inlet of the absorption tower, unit load, slurry density, and pH measurement value.

[0061] Specifically, the sulfur dioxide concentration at the inlet of the absorption tower is obtained by using a gas concentration detection device pre-installed in the flue gas duct at the inlet of the absorption tower in the desulfurization system to collect real-time data on the sulfur dioxide gas concentration in the flue gas duct. This parameter directly reflects the load intensity of the pollutants to be treated in the desulfurization system. Its real-time acquisition ensures that the subsequent slurry supply demand calculation can accurately match the current desulfurization task, avoiding a disconnect between the slurry supply and the actual demand due to fluctuations in sulfur dioxide concentration.

[0062] Unit load acquisition: Relying on the data interaction interface of the power plant's unit control system, the current operating load data of the unit is read in real time. The unit load is directly related to the boiler flue gas emissions. Changes in load will cause changes in the total amount of flue gas entering the absorption tower, thus affecting the total amount of sulfur dioxide treated.

[0063] Slurry density acquisition: Density sensors are deployed in key pipelines or slurry storage areas of the desulfurization tower slurry circulation system to collect slurry density data in real time. Slurry density is closely related to the limestone content and gypsum production in the slurry, and its changes directly reflect the slurry quality and the desulfurization reaction process.

[0064] pH Measurement Acquisition: pH sensors are deployed in different areas within the absorption tower (such as the slurry reaction zone and the outlet slurry zone) to collect slurry pH data in real time and compare it with the preset pH setpoint. pH is a core indicator of desulfurization reaction efficiency, directly affecting sulfur dioxide absorption. Real-time acquisition of this parameter allows for rapid detection of pH deviations from the setpoint, providing immediate feedback signals for PID closed-loop control, slurry pump frequency adjustment, and slurry valve opening optimization, ensuring the safe and stable operation of the unit.

[0065] 102. Based on process parameters, dynamically calculate the real-time demand and supply of limestone slurry.

[0066] Specifically, the system first calls its preset limestone consumption calculation model, using real-time data on sulfur dioxide concentration at the absorber inlet, unit load, slurry density, and pH as core input parameters. The sulfur dioxide concentration at the absorber inlet directly determines the total amount of pollutants to be removed per unit time. The unit load, related to flue gas emissions, affects the total sulfur dioxide treatment capacity; both provide the model with basic data on pollutant load. Slurry density reflects the content of effective reactive components (limestone) and the enrichment degree of reaction products (gypsum) in the slurry, preventing discrepancies between the calculated slurry supply and actual reaction requirements due to abnormal slurry concentration. The pH measurement serves as direct feedback on desulfurization reaction efficiency, ensuring that the calculated slurry supply initially maintains the slurry pH within a reasonable reaction range. The basic slurry supply calculated by this model can initially match the desulfurization demand under stable operating conditions, reducing the lag caused by manual estimation of slurry supply, laying the foundation for subsequent precise adjustments, reducing the frequency of manual intervention by operators, alleviating labor intensity, and ensuring the initial stability of desulfurization effects.

[0067] Based on real-time collected sulfur dioxide concentration data at the absorber inlet, the system's built-in rate of change calculation module continuously calculates the amplitude and trend of sulfur dioxide concentration changes per unit time, obtaining the sulfur dioxide concentration change rate. Similarly, relying on real-time unit load data, the system calculates the amplitude and trend of unit load fluctuations per unit time, obtaining the unit load change rate. This step can proactively capture the dynamic fluctuation trends of sulfur dioxide concentration and unit load, avoiding the problem of being unable to cope with sudden changes in operating conditions due to relying solely on current static parameters to calculate slurry supply. It provides crucial dynamic data support for subsequent feedforward compensation, helps improve the foresight of slurry supply adjustment, and reduces the fluctuation of desulfurization tower performance when process conditions fluctuate.

[0068] The calculated sulfur dioxide concentration change rate and unit load change rate are used as feedforward compensation values ​​and introduced into the basic slurry supply adjustment logic. When the sulfur dioxide concentration is increasing, the slurry supply is increased in advance through feedforward compensation to avoid insufficient desulfurization reaction and decreased desulfurization efficiency due to the increased sulfur dioxide concentration. When the sulfur dioxide concentration is decreasing, the slurry supply is reduced accordingly to prevent reagent waste. Similarly, when the unit load increases, the flue gas volume increases, and the slurry supply is increased synchronously through feedforward compensation to match the larger desulfurization task. When the unit load decreases, the slurry supply is reduced to avoid problems such as slurry quality degradation and demister blockage caused by excessive slurry supply. After dynamically correcting the basic slurry supply through this feedforward compensation mechanism, the final real-time demand supply is generated. This process can effectively eliminate the problem of slurry supply lag caused by fluctuations in operating conditions, ensuring that the slurry supply is always precisely matched with the dynamic demand of the desulfurization reaction. This not only ensures that the desulfurization system continuously and stably meets environmental emission standards, but also reduces resource waste, slows down equipment aging, improves the level of system automation, reduces safety hazards caused by improper manual operation, and ensures the safe and stable operation of the unit.

[0069] 103. Determine the preset load range to which the unit load belongs.

[0070] Specifically, based on the historical operating characteristics of the desulfurization system, multiple preset load ranges covering the low to full load of the unit are divided within the control unit. At the same time, the slurry supply control strategies corresponding to each range (such as low load valve priority and high load pump frequency linkage) are associated and stored in the database to form a standardized operating condition classification system. This avoids confusion in control strategies, provides a basis for subsequent precise adjustment, improves the system's multi-operating condition adaptability, and reduces the amount of manual operation.

[0071] Real-time load data is acquired through a data interface with the power plant's unit control system. A built-in filtering module eliminates instantaneous interference and measurement errors, ensuring the data accurately reflects the actual operating status of the unit. This avoids misjudgments of load range caused by false fluctuations, reduces ineffective actions of the slurry supply equipment, slows equipment aging, and guarantees the reliability of the judgment results. The pre-processed load data is compared one by one with a preset range, and the logic judgment module determines the corresponding interval. If the data is close to the interval boundary, continuous monitoring and analysis of the load trend ensures stable judgment.

[0072] 104. Select control strategy based on the judgment result of the preset load range: When the unit load is lower than the first threshold, prioritize adjusting the opening of the slurry supply valve and limit the frequency change range of the slurry supply pump; when the unit load is higher than the second threshold, synchronously coordinate the control of the slurry supply pump frequency and the opening of the slurry supply valve.

[0073] Specifically, when the unit load is below the first threshold, the opening of the grout supply valve is adjusted first, and the frequency variation range of the grout supply pump is limited. Within the system control unit, dedicated control logic for when the unit load is below the first threshold is pre-stored, namely the strategy of "prioritizing grout supply valve opening adjustment + limiting grout supply pump frequency variation range." The adjustment response rate and opening range of the grout supply valve, as well as the upper and lower limits of the grout supply pump frequency, are clearly defined under this strategy. When the load range judgment module determines that the current unit load is below the first threshold, this low-load control strategy is automatically triggered without manual intervention from operators. This avoids the lag in manual judgment and strategy switching, improves the system's automated response efficiency, and provides standardized control for stable grout supply under low-load conditions, reducing grout supply deviations caused by improper strategy selection.

[0074] First, the slurry supply control module is invoked. Using the previously dynamically calculated real-time demand for limestone slurry as the target, and combining this with current slurry flow feedback data, the opening of the slurry supply control valve is adjusted. Under low-load conditions, the flue gas volume and total sulfur dioxide treatment volume are relatively small, resulting in a relatively low slurry supply demand. Adjusting the valve opening allows for fine-tuning of the slurry supply, avoiding oversupply or undersupply caused by frequency adjustments to the slurry pump (which can easily lead to large flow fluctuations).

[0075] While adjusting the opening of the slurry supply valve, the system activates the slurry pump frequency limiting logic, locking the frequency adjustment range of the slurry pump inverter within a preset low-load adaptation range. This prevents the slurry pump frequency from exceeding the upper and lower limits of this range. Under low-load conditions, if the slurry pump frequency fluctuates without restriction, problems can easily arise: an excessively high frequency leading to a slurry supply far exceeding actual demand, or an excessively low frequency causing pump instability (such as cavitation or increased vibration). An excessively high frequency results in wasted reagents and deterioration of slurry quality, while an excessively low frequency affects slurry supply stability, leading to discontinuous desulfurization reactions. By limiting the frequency variation range, it can be ensured that the slurry pump always operates within a stable range under low-load conditions.

[0076] When the unit load exceeds the second threshold, the frequency of the slurry pump and the opening of the slurry valve are synchronously coordinated and controlled. The synchronous coordination control logic for when the load exceeds the second threshold is pre-stored in the control unit, clarifying the linkage rules and adjustment ratios of the pump frequency and valve opening. When the load judgment module confirms that the unit load exceeds the second threshold, this strategy is automatically triggered without manual intervention, ensuring rapid response to high load slurry supply demands and improving the level of automation.

[0077] Targeting the real-time demand for slurry supply, and combining pipeline characteristic curves with PID closed-loop control, the frequency of the slurry supply pump is primarily adjusted to quickly achieve the large-flow basic slurry supply required for high loads. This avoids the situation where a single valve adjustment cannot meet the slurry supply demand, leading to a decrease in desulfurization efficiency. Simultaneously, flow feedback eliminates deviations, ensuring stable basic slurry supply. After the pump frequency stabilizes and basic slurry supply is achieved, the opening of the slurry supply valve is simultaneously fine-tuned based on real-time slurry flow rate, pH value, and other parameters to correct minor deviations in pump frequency adjustment, preventing excessive or insufficient slurry supply and ensuring that desulfurization efficiency meets standards.

[0078] 105. Execute the control instructions corresponding to the selected control strategy to match the slurry supply with the real-time demand.

[0079] Specifically, the abstract control commands output by the selected control strategy are converted into physical signals recognizable by the slurry pump frequency converter and the slurry valve through a built-in signal conversion module. Specifically, the frequency adjustment command of the slurry pump is converted into an electrical signal within the corresponding range, and the opening adjustment command of the slurry valve is converted into a displacement control signal that drives the valve's movement.

[0080] The converted frequency control signal and opening control signal are synchronously output to the corresponding actuators. The slurry pump frequency converter adjusts the motor speed upon receiving the frequency signal, and the slurry supply gate drive controls the valve core displacement upon receiving the opening signal. This synchronous output mechanism ensures the coordinated operation of the slurry pump and the slurry supply gate, avoiding instantaneous slurry supply imbalance caused by signal output delays. The rapid response characteristics of the actuators shorten the lag time from control commands to actual actions, improve the system's response speed to changes in slurry supply demand, reduce slurry supply deviations during operating condition fluctuations, and ensure stable desulfurization efficiency.

[0081] Flow monitoring devices are deployed at key nodes in the slurry delivery pipeline to collect real-time data on the actual slurry supply and transmit it to the system control unit. The actual supply is dynamically compared with the preset real-time demand, and the deviation (including the magnitude and trend of the deviation) is calculated. The high frequency of this monitoring process ensures timely detection of subtle fluctuations in the slurry supply, preventing the desulfurization effect from deteriorating due to accumulated deviations. The deviation comparison provides a clear basis for subsequent adjustments, preventing resource waste caused by blind adjustments and improving the targeting and effectiveness of control.

[0082] Based on the deviation comparison results, a PID closed-loop control algorithm generates correction commands to dynamically adjust the frequency control signal output to the slurry pump inverter and the opening control signal of the slurry supply valve. For example, when the actual supply is lower than the demand, the pump frequency or valve opening is increased according to the control strategy weight; when the actual supply is higher than the demand, the corresponding parameters are decreased proportionally. This dynamic adjustment process continues until the deviation between the actual supply and the demand is reduced to a preset allowable range. Through the closed-loop feedback mechanism, the system can automatically offset the impact of external disturbances on the slurry supply, ensuring that the slurry supply always accurately matches the real-time demand of the desulfurization reaction, and improving the reliability and stability of the system's automated operation.

[0083] 106. During the matching process, continuously monitor the status parameters of the grout supply system and trigger corresponding protection actions when abnormal status parameters of the grout supply system are detected.

[0084] Specifically, monitoring sensors are installed at key locations on the slurry pump (current, vibration, outlet pressure) and slurry pipeline (flow rate, differential pressure). Real-time parameters are acquired through high-frequency sampling, comprehensively covering the core operating status of the system. This provides accurate data for safety early warning and reduces the risk of sudden equipment failures. The collected current, vibration, pressure, flow rate, and differential pressure data are compared in real time with preset safety thresholds to quickly screen for parameters exceeding limits. This prevents initial failures of parameters exceeding limits from escalating the fault and improves the targeted nature of anomaly identification. If a parameter exceeds the limit, a delayed judgment mechanism is activated. An anomaly is only determined when the duration of the exceedance reaches a preset standard, avoiding misjudgments caused by instantaneous fluctuations and preventing frequent triggering of protection actions that could affect system stability. Upon an anomaly detection, an audible and visual alarm is immediately triggered to alert personnel. If the slurry pump malfunctions (e.g., abnormal current, vibration, or pressure), the backup pump is automatically switched to ensure uninterrupted slurry supply. If there is severe pipeline blockage (zero flow rate, excessive differential pressure) or multiple high-risk anomalies, load reduction or shutdown protection is implemented to prevent safety accidents and improve system operational safety.

[0085] The preset safe operating thresholds are dynamically adjusted in the following ways: based on historical operating data and equipment operating conditions, an adaptive threshold model is established for parameters such as slurry pump current, vibration, outlet pressure, flow rate, and differential pressure; this avoids the problem of insufficient adaptability of fixed thresholds, makes the thresholds more in line with the actual operating characteristics of the equipment, and improves the accuracy of anomaly detection.

[0086] Based on real-time changes in unit load and slurry density, a threshold adaptive model dynamically calculates and updates the corresponding safe operating thresholds for each parameter. The real-time collected unit load and slurry density are input into the model, which dynamically calculates and updates the safe operating thresholds for each parameter according to the current operating conditions (e.g., increasing the pump current threshold under high load and relaxing the pipeline differential pressure threshold when slurry density increases). This ensures that the thresholds match the real-time operating conditions, reduces false alarms or missed alarms, and guarantees system stability and equipment safety.

[0087] The automatic switching to the standby grout pump operation includes: when it is determined that the standby pump needs to be switched, locking the frequency control command and the grout valve opening command of the currently running grout pump; according to the preset switching sequence, first starting the standby grout pump to the specified frequency, and then synchronously adjusting the opening of the standby pipeline grout valve; after the grout flow rate of the standby pipeline stabilizes, gradually reducing the frequency of the faulty pipeline grout pump and closing its grout valve to complete the seamless switching process.

[0088] Furthermore, based on the above embodiments, this embodiment synchronously coordinates and controls the frequency of the grout pump and the opening of the grout valve, including: calculating the reference frequency of the grout pump and the reference opening of the grout valve according to the real-time demand supply and the characteristic curve of the grout pipeline; using the reference frequency and reference opening as initial values, adopting a closed-loop control algorithm, and using the deviation between the actual grout flow rate and the set flow rate as feedback input, synchronously adjusting the operating frequency of the grout pump and the opening of the grout valve to stabilize the grout supply at the real-time demand supply.

[0089] Specifically, the pre-stored mapping table of slurry pipeline characteristic curves and slurry supply volume is queried. Based on the real-time demand supply volume, the recommended frequency value of the slurry pump and the recommended opening value of the slurry valve are matched and obtained. The recommended frequency value and the recommended opening value are used as the initial calculated values ​​of the reference frequency and the reference opening value, respectively.

[0090] Using the calculated reference frequency and reference opening as initial values, the system initiates a closed-loop control algorithm. During the adjustment process, the actual slurry flow rate is collected in real time by a flow sensor on the slurry pipeline and compared with the set flow rate corresponding to the real-time demand supply to obtain the flow deviation value. This deviation value is used as feedback input to the closed-loop control algorithm, which synchronously generates the slurry pump frequency adjustment and slurry valve opening adjustment based on the deviation characteristics. For example, when the actual flow rate is lower than the set flow rate, the pump frequency (increasing output power) and valve opening (expanding the flow cross-section) are increased simultaneously according to the coordination rule; when the actual flow rate is higher than the set flow rate, the pump frequency and valve opening are decreased proportionally. Through this synchronous adjustment mechanism, the limitations of a single adjustment method can be avoided, achieving rapid and stable adjustment of the slurry supply, ensuring its stability at the real-time demand supply level. This not only guarantees the desulfurization reaction efficiency but also reduces equipment wear and energy waste caused by frequent adjustments, improving the system's economic efficiency and reliability.

[0091] During synchronous regulation, the operating parameters of the slurry pump (such as current and outlet pressure) and the response speed of the regulating valve are continuously monitored. Combined with the dynamic correction factor of the pipeline characteristic curve, the adjustment weights of frequency and valve opening are fine-tuned in real time. For example, when the pipeline pressure is abnormal, the pump frequency adjustment weight is appropriately reduced and the regulating valve opening adjustment weight is increased to alleviate pressure fluctuations; when the regulating valve response is lagging, the pump frequency adjustment weight is temporarily increased to ensure rapid flow follow-up. This dynamic adaptation mechanism further optimizes the synergy of synchronous regulation, reduces the impact of external interference on slurry supply stability, and ensures that the slurry supply and real-time demand are accurately matched even under complex operating conditions, providing a core guarantee for the efficient and stable operation of the desulfurization system.

[0092] The process involves using a reference frequency and reference opening as initial values, employing a closed-loop control algorithm, and using the deviation between the actual slurry flow rate and the set flow rate as feedback input to synchronously adjust the operating frequency of the slurry pump and the opening of the slurry valve. This includes: inputting the deviation between the actual slurry flow rate and the set flow rate to a PID controller, which outputs a first adjustment amount; simultaneously superimposing the first adjustment amount onto the reference frequency and reference opening according to a preset distribution ratio to generate a final frequency control command for the slurry pump and a final opening control command for the slurry valve; and synchronously controlling the slurry pump frequency converter and the slurry valve actuator based on the final frequency control command and the final opening control command.

[0093] Specifically, the actual slurry flow rate is collected in real time and compared with the set flow rate to calculate the deviation. This deviation value is then input to a preset PID controller, which calculates and outputs a first adjustment amount to correct the deviation based on the deviation characteristics. The introduction of the PID controller enables dynamic response to the deviation and elimination of cumulative errors, ensuring the accuracy of the first adjustment amount. This provides a scientific basis for subsequent coordinated adjustments, reduces flow fluctuations caused by over- or under-adjustment, and ensures the stability of the desulfurization reaction.

[0094] The first adjustment value output by the PID controller is simultaneously superimposed on the reference frequency of the grout pump and the reference opening of the grout supply valve according to a preset allocation ratio. This ratio is preset based on the adjustment sensitivity of the grout pump and the grout supply valve, equipment characteristics, and coordination requirements under different operating conditions. For example, the allocation weight of the grout pump frequency can be increased when a rapid response is required, and the allocation weight of the grout supply valve opening can be increased when fine adjustment is required. After proportional allocation, the final frequency control command of the grout pump and the final opening control command of the grout supply valve are generated. This allocation mechanism ensures the coordination of the adjustment actions of the two devices, avoids grout pressure fluctuations or flow oscillations caused by over-adjustment of a single device, achieves smooth correction of the grout supply, and fully leverages the coordinated adjustment advantages of the pump and valve to expand the adjustment range and accuracy of the grout supply.

[0095] The final frequency control command is transmitted to the frequency converter of the slurry pump, driving the frequency converter to adjust the motor operating frequency and change the output power of the slurry pump. Simultaneously, the final opening control command is transmitted to the actuator (such as an electric or pneumatic drive) of the slurry valve, controlling the valve core displacement to change the flow cross-section. This synchronized action quickly corrects the actual slurry flow rate to the set flow rate, ensuring that the slurry supply matches the desulfurization demand in real time. This guarantees stable desulfurization efficiency while reducing energy waste and mechanical wear caused by frequent equipment start-ups, shutdowns, or drastic adjustments, thus improving the system's economy and reliability.

[0096] Based on the same general inventive concept, this invention also protects a desulfurization slurry supply control system, the desulfurization slurry supply control system described below and the desulfurization slurry supply control method described above can be referred to in correspondence.

[0097] Figure 2 This is a schematic diagram of the desulfurization slurry supply control system provided in this embodiment.

[0098] like Figure 2 As shown, this embodiment provides a desulfurization slurry supply control system, including:

[0099] The acquisition module 201 is used to acquire the process parameters of the desulfurization system in real time. The process parameters include the sulfur dioxide concentration at the inlet of the absorption tower, the unit load, the slurry density, and the pH measurement value.

[0100] The calculation module 202 is used to dynamically calculate the real-time demand and supply of limestone slurry based on process parameters.

[0101] The judgment module 203 is used to determine the preset load range to which the unit load belongs;

[0102] Selection module 204 is used to select a control strategy based on the judgment result of the preset load range: when the unit load is lower than the first threshold, the opening of the slurry supply valve is adjusted first and the frequency change range of the slurry supply pump is limited; when the unit load is higher than the second threshold, the frequency of the slurry supply pump and the opening of the slurry supply valve are controlled synchronously and in coordination.

[0103] Matching module 205 is used to execute control instructions corresponding to the selected control strategy so that the slurry supply quantity matches the real-time demand supply quantity.

[0104] The monitoring module 206 is used to continuously monitor the status parameters of the slurry supply system during the matching process and trigger corresponding protection actions when abnormal status parameters of the slurry supply system are detected.

[0105] Figure 3 This is a schematic diagram of the structure of the electronic device provided in this embodiment.

[0106] like Figure 3 As shown, the electronic device may include a processor 310, a communication interface 320, a memory 330, and a communication bus 340. The processor 310, communication interface 320, and memory 330 communicate with each other via the communication bus 340. The processor 310 can call logic instructions stored in the memory 330 to execute a desulfurization slurry supply control method.

[0107] Furthermore, the logical instructions in the aforementioned memory 330 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0108] On the other hand, the present invention also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer is able to execute the desulfurization slurry supply control method provided by the above methods.

[0109] In another aspect, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to perform the desulfurization slurry supply control method provided by the above methods.

[0110] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0111] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0112] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for controlling the supply of desulfurization slurry, characterized in that, include: The process parameters of the desulfurization system are acquired in real time, including the sulfur dioxide concentration at the inlet of the absorption tower, the unit load, the slurry density, and the pH value. Based on the process parameters, the real-time demand and supply of limestone slurry are dynamically calculated. Determine the preset load range to which the unit load belongs; Based on the judgment result of the preset load range, the control strategy is selected as follows: when the unit load is lower than the first threshold, the opening of the slurry supply valve is adjusted first and the frequency variation range of the slurry supply pump is limited; when the unit load is higher than the second threshold, the frequency of the slurry supply pump and the opening of the slurry supply valve are controlled synchronously and in coordination. Execute the control instructions corresponding to the selected control strategy to match the real-time demand supply of slurry; During the matching process, the status parameters of the slurry supply system are continuously monitored, and corresponding protection actions are triggered when abnormal status parameters of the slurry supply system are detected.

2. The desulfurization slurry supply control method according to claim 1, characterized in that, The synchronous coordination control of the slurry pump frequency and the slurry valve opening includes: Based on the real-time demand supply and slurry pipeline characteristic curve, calculate the reference frequency of the slurry pump and the reference opening of the slurry regulating valve. Using the reference frequency and reference opening as initial values, a closed-loop control algorithm is adopted, with the deviation between the actual slurry flow rate and the set flow rate as feedback input, to synchronously adjust the operating frequency of the slurry pump and the opening of the slurry valve, so that the slurry supply is stabilized at the real-time demand supply.

3. The desulfurization slurry supply control method according to claim 2, characterized in that, The step of calculating the reference frequency of the slurry pump and the reference opening of the slurry control valve based on the real-time demand supply and the slurry pipeline characteristic curve includes: Query the pre-stored mapping table of slurry pipeline characteristic curves and slurry supply volume, and match the corresponding recommended frequency value of the slurry supply pump and the recommended opening value of the slurry supply valve according to the real-time demand supply volume; The recommended frequency value and recommended opening value are used as the initial calculated values ​​for the reference frequency and reference opening value, respectively.

4. The desulfurization slurry supply control method according to claim 2, characterized in that, The process, using the reference frequency and reference opening as initial values, employs a closed-loop control algorithm, with the deviation between the actual slurry flow rate and the set flow rate as feedback input, to synchronously adjust the operating frequency of the slurry pump and the opening of the slurry valve, including: The deviation between the actual slurry flow rate and the set flow rate is input to the PID controller, which outputs the first adjustment amount. The first adjustment amount is simultaneously superimposed on the reference frequency and the reference opening according to a preset allocation ratio to generate the final frequency control command of the slurry pump and the final opening control command of the slurry valve. Based on the final frequency control command and the final opening control command, the slurry pump frequency converter and the slurry regulating valve actuator are synchronously controlled.

5. The desulfurization slurry supply control method according to claim 1, characterized in that, The dynamic calculation of the real-time demand supply of limestone slurry based on the process parameters includes: Based on the sulfur dioxide concentration at the inlet of the absorption tower, the unit load, the slurry density, and the pH measurement, the basic slurry supply is calculated using a preset limestone consumption calculation model. By introducing the sulfur dioxide concentration change rate and the unit load change rate as feedforward compensation quantities, the basic slurry supply is dynamically corrected to generate the real-time demand supply.

6. The desulfurization slurry supply control method according to claim 5, characterized in that, The execution of the control command corresponding to the selected control strategy to match the slurry supply to the real-time demand supply includes: The control commands are converted into frequency control signals for the slurry pump inverter and opening control signals for the slurry supply valve. The frequency control signal and the opening control signal are synchronously output to the actuator to drive the slurry pump and the slurry regulating valve to operate. Real-time monitoring of the actual slurry supply and comparison with the real-time demand supply; Based on the comparison results, the frequency control signal and the opening control signal are dynamically adjusted through closed-loop feedback to ensure that the actual slurry supply continuously matches the real-time demand supply.

7. The desulfurization slurry supply control method according to claim 1, characterized in that, The process of continuously monitoring the status parameters of the grout supply system during the matching process, and triggering corresponding protection actions when abnormal status parameters of the grout supply system are detected, includes: Real-time data collection of slurry pump current, vibration, and outlet pressure, as well as slurry pipeline flow rate and differential pressure; The collected current, vibration, outlet pressure, flow rate, and differential pressure values ​​are compared with preset safe operating thresholds. When any parameter value continuously exceeds the corresponding safe operation threshold for a preset duration, it is determined to be an abnormal state; In response to the abnormal state, an audible and visual alarm is triggered and a predetermined protection action is automatically executed. The protection action includes: automatically switching to the standby slurry pump operation, and / or, executing a load reduction or shutdown protection procedure according to the type of abnormal parameter.

8. The desulfurization slurry supply control method according to claim 7, characterized in that, The preset safe operating threshold is dynamically adjusted in the following ways: Based on historical operating data and equipment operating conditions, an adaptive threshold model is established for the parameters of the slurry pump, including current, vibration, outlet pressure, flow rate, and differential pressure. Based on real-time changes in unit load and slurry density, the safe operating thresholds corresponding to each parameter are dynamically calculated and updated through the threshold adaptive model.

9. The desulfurization slurry supply control method according to claim 7, characterized in that, The automatic switch to standby slurry pump operation includes: When it is determined that the standby pump needs to be switched, the frequency control command of the currently running slurry pump and the opening command of the slurry valve are locked. According to the preset switching sequence, first start the standby grout pump to the specified frequency, and then synchronously adjust the opening of the standby pipeline grout supply valve; Once the slurry flow rate in the backup pipeline has stabilized, gradually reduce the frequency of the slurry pump in the faulty pipeline and close its slurry control valve to complete the seamless switching process.

10. A desulfurization slurry supply control system, characterized in that, include: The acquisition module is used to acquire process parameters of the desulfurization system in real time, including sulfur dioxide concentration at the inlet of the absorption tower, unit load, slurry density, and pH measurement value. The calculation module is used to dynamically calculate the real-time demand and supply of limestone slurry based on the process parameters. The judgment module is used to determine the preset load range to which the unit load belongs; The selection module is used to select a control strategy based on the judgment result of the preset load range: when the unit load is lower than the first threshold, the opening of the slurry supply valve is adjusted first and the frequency change range of the slurry supply pump is limited; when the unit load is higher than the second threshold, the frequency of the slurry supply pump and the opening of the slurry supply valve are controlled synchronously and in coordination. The matching module is used to execute the control instructions corresponding to the selected control strategy so that the slurry supply quantity matches the real-time demand supply quantity. The monitoring module is used to continuously monitor the status parameters of the slurry supply system during the matching process, and to trigger corresponding protection actions when abnormal status parameters of the slurry supply system are detected.

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