Water supply flow control method and device for thermal power generating unit and electronic equipment

Abstract

The application relates to a water supply flow control method and device of a thermal power generating unit and electronic equipment, wherein the method comprises the following steps: obtaining water supply flow data and equipment state data of a water supply system of the thermal power generating unit; calculating an estimated value of water supply flow of the water supply system based on the water supply flow data; calculating an equipment health index of the water supply system by using the equipment state data and the estimated value of the water supply flow; determining a defense protection action of the water supply system in combination with the equipment health index, the estimated value of the water supply flow and the equipment state data, so as to execute the defense protection action and adjust the actual water supply flow of the water supply system. Thus, the technical problem that, in the related art, the protection mechanism of the water supply system adjustment is single, the boiler main protection is triggered only when the water supply flow or the steam drum water level reaches a dangerous threshold, the non-planned shutdown of the unit is easily caused, and the working efficiency of the unit is affected, is solved.

Description

Technical Field

[0001] This application relates to the field of automatic control and safety protection technology for thermal power plants, and in particular to a method, device and electronic equipment for controlling the feedwater flow of a thermal power generating unit. Background Technology

[0002] During the operation of a thermal power generating unit, the reliability of the water supply system is directly related to the safe and stable operation of the entire unit.

[0003] In related technologies, the protection mechanism of the feedwater system regulation is simple, and the main protection of the boiler is only triggered when the feedwater flow or the steam drum water level reaches the danger threshold. It is difficult to prevent in advance, which can easily lead to unplanned shutdowns of the unit and affect the working efficiency of the unit. It is urgent to improve. Summary of the Invention

[0004] This application provides a method, device, and electronic equipment for controlling the feedwater flow of a thermal power generating unit, in order to solve the technical problem in the related art that the protection mechanism for feedwater system regulation is singular, and only triggers the main boiler protection when the feedwater flow or the steam drum water level reaches a dangerous threshold, which easily leads to unplanned shutdown of the unit and affects the working efficiency of the unit.

[0005] The first aspect of this application provides a method for controlling the feedwater flow of a thermal power generating unit, comprising the following steps: acquiring feedwater flow data and equipment status data of the feedwater system of the thermal power generating unit; calculating an estimated value of the feedwater flow of the feedwater system based on the feedwater flow data; calculating an equipment health index of the feedwater system using the equipment status data and the estimated value of the feedwater flow; and determining a defense protection action of the feedwater system by combining the equipment health index, the estimated value of the feedwater flow, and the equipment status data, so as to execute the defense protection action and adjust the actual feedwater flow of the feedwater system.

[0006] According to the above technical solution, the embodiments of this application can identify hidden faults such as performance degradation by quantitatively assessing the health status of the equipment, and achieve early prevention by combining the health status of the equipment and real-time data.

[0007] Optionally, in one embodiment of this application, the water flow data is collected by at least three flow meters arranged in parallel. After acquiring the water flow data of the feedwater system of the thermal power generating unit, the method further includes: selecting any two flow meters from the water flow data, calculating the corresponding flow data deviation values, until the calculation of the water flow data collected by all flow meters is completed, and obtaining multiple flow data deviation values; comparing the multiple flow data deviation values ​​with a preset flow data deviation threshold to determine whether the water flow data meets a preset confidence condition; if the preset confidence condition is met, calculating an estimated value of the water flow of the feedwater system based on the water flow data; if the preset confidence condition is not met, determining a data acquisition fault source based on the multiple flow data deviation values ​​and the preset flow data deviation threshold, and determining the target water flow data for calculating the estimated value based on the data acquisition fault source, or generating a corresponding early warning signal based on the data acquisition fault source.

[0008] According to the above technical solution, the embodiments of this application can achieve cross-validation through multiple parallel flow meters to ensure the reliability of the data, improve the overall robustness through redundant operation, and ensure the calculation accuracy of subsequent calculations.

[0009] Optionally, in one embodiment of this application, the step of calculating the equipment health index of the water supply system using the equipment status data and the estimated value of the water supply flow includes: constructing a corresponding digital twin model based on the system parameters of the water supply system; calculating the actual efficiency of the water supply system using the estimated value and the current speed of the water supply pump of the water supply system; and calculating the equipment health index of the water supply system using the actual efficiency and the rated efficiency of the water supply system.

[0010] According to the above technical solution, the embodiments of this application can quantify the health status of the equipment, identify performance degradation trends in advance, and achieve predictive maintenance.

[0011] Optionally, in one embodiment of this application, determining the defensive protection action of the water supply system by combining the equipment health index, the estimated value of the water supply flow rate, and the equipment status data includes: using the digital twin model and the equipment status data to predict the current rated flow rate of the water supply system at the current speed of the water supply pump in the water supply system; calculating the flow rate difference between the current rated flow rate and the estimated value; and combining the flow rate difference, the equipment status parameters, and the equipment health index to determine the defensive protection action of the water supply system.

[0012] According to the above technical solution, the embodiments of this application can determine the triggered defense protection action by calculating the difference between the rated flow predicted by the calculation model and the actual estimated value, and then combining the actual flow difference.

[0013] Optionally, in one embodiment of this application, determining the defense and protection action of the water supply system by combining the flow difference, the equipment status parameters, and the equipment health index includes: obtaining the response delay of the regulating valve, the actual opening degree of the regulating valve, and the output of a single water supply pump of the water supply system based on the equipment status parameters; determining the desired opening degree of the regulating valve of the water supply system based on the flow command, and obtaining the opening degree difference by combining the desired opening degree and the actual opening degree; determining the defense and protection action as a first-level defense and protection action to generate a flow warning signal when the flow difference is greater than a preset difference threshold, or the equipment health index is less than a preset index threshold, or the regulating valve response delay is greater than a preset delay threshold; and determining the defense and protection action as a second-level defense and protection action when the estimated value is less than a preset lower limit of operating flow, or the output of a single water supply pump is greater than or equal to a preset upper limit of output, or the opening degree difference is greater than a preset opening degree difference threshold, thereby starting a standby water supply pump, switching the regulating channel to the standby regulating channel, and adjusting the water supply pump speed to a preset speed.

[0014] According to the above technical solution, the embodiments of this application can incorporate control parameters such as the response of the regulating valve and the opening difference into the judgment, making the protection action more targeted and able to quickly eliminate local fault points.

[0015] Optionally, in one embodiment of this application, after performing the secondary defense protection action, the method further includes: calculating a new estimated value; determining the changing trend of the water supply flow rate based on the new estimated value; and calculating the corresponding water supply flow rate change value if the changing trend is a downward trend; if the water supply flow rate change value is greater than a preset change threshold, determining the load reduction rate of the thermal power generating unit based on the water supply flow rate change value; calculating the target load of the thermal power generating unit based on the new estimated value; generating a load reduction command for the thermal power generating unit by combining the system load reduction rate and the target load; and adjusting the operating load of the thermal power generating unit using the load reduction command.

[0016] According to the above technical solution, the embodiments of this application can adaptively calculate the load reduction rate based on the flow rate decrease rate (change value), which can ensure the safety of the unit and minimize the loss of power generation, thereby improving the economy and safety of the unit operation.

[0017] A second aspect of this application provides a feedwater flow control device for a thermal power generating unit, comprising: an acquisition module for acquiring feedwater flow data and equipment status data of the feedwater system of the thermal power generating unit; a first calculation module for calculating an estimated value of the feedwater flow of the feedwater system based on the feedwater flow data; a second calculation module for calculating an equipment health index of the feedwater system using the equipment status data and the estimated value of the feedwater flow; and a first control module for determining a defense protection action of the feedwater system by combining the equipment health index, the estimated value of the feedwater flow, and the equipment status data, so as to execute the defense protection action and adjust the actual feedwater flow of the feedwater system.

[0018] Optionally, in one embodiment of this application, the water supply flow data is collected by at least three flow meters arranged in parallel, and further includes: a third calculation module, used to select water supply flow data collected by any two flow meters from the water supply flow data, calculate the corresponding flow data deviation value, until the calculation of water supply flow data collected by all flow meters is completed, and obtain multiple flow data deviation values; a judgment module, used to compare the multiple flow data deviation values ​​with a preset flow data deviation threshold to determine whether the water supply flow data meets a preset confidence condition; a second control module, used to calculate an estimated value of the water supply flow of the water supply system based on the water supply flow data if the preset confidence condition is met; and a third control module, used to determine a data acquisition fault source based on the multiple flow data deviation values ​​and the preset flow data deviation threshold if the preset confidence condition is not met, so as to determine the target water supply flow data for calculating the estimated value based on the data acquisition fault source, or to generate a corresponding early warning signal based on the data acquisition fault source.

[0019] Optionally, in one embodiment of this application, the second calculation module includes: a construction unit for constructing a corresponding digital twin model based on the system parameters of the water supply system; a first calculation unit for calculating the actual efficiency of the water supply system using the estimated value and the current rotational speed of the water supply pump of the water supply system; and a second calculation unit for calculating the equipment health index of the water supply system using the actual efficiency and the rated efficiency of the water supply system.

[0020] Optionally, in one embodiment of this application, the first control module includes: a prediction unit, used to predict the current rated flow rate of the water supply system at the current rotational speed of the water supply pump using the digital twin model and the equipment status data; a third calculation unit, used to calculate the flow difference between the current rated flow rate and the estimated value; and a determination unit, used to determine the defense and protection actions of the water supply system by combining the flow difference, the equipment status parameters, and the equipment health index.

[0021] Optionally, in one embodiment of this application, the determining unit includes: an acquisition subunit, configured to acquire, based on the equipment status parameters, the regulating valve response delay, the actual regulating valve opening, and the output of a single water pump in the water supply system; a first calculation subunit, configured to determine, based on a flow command, the desired regulating valve opening of the water supply system, and combine the desired regulating valve opening and the actual regulating valve opening to obtain an opening difference; a first determining subunit, configured to determine, in the case that the flow difference is greater than a preset difference threshold, or the equipment health index is less than a preset index threshold, or the regulating valve response delay is greater than a preset delay threshold, as a first-level defense protection action to generate a flow warning signal; and a second determining subunit, configured to determine, in the case that the estimated value is less than a preset lower limit of operating flow, or the output of a single water pump is greater than or equal to a preset upper limit of output, or the opening difference is greater than a preset opening difference threshold, as a second-level defense protection action to start a standby water pump, switch the regulating channel to the standby regulating channel, and adjust the water pump speed to a preset speed.

[0022] Optionally, in one embodiment of this application, the determining unit further includes: a second calculation subunit, configured to calculate a new estimated value, determine the changing trend of the water supply flow rate based on the new estimated value, and calculate the corresponding water supply flow rate change value when the changing trend is a downward trend; and a control subunit, configured to determine the load reduction rate of the thermal power generating unit based on the water supply flow rate change value when the water supply flow rate change value is greater than a preset change threshold, calculate the target load of the thermal power generating unit based on the new estimated value, generate a load reduction command for the thermal power generating unit by combining the system load reduction rate and the target load, and adjust the operating load of the thermal power generating unit using the load reduction command.

[0023] A third aspect of this application provides an electronic device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the water supply flow control method for a thermal power generating unit as described in the above embodiments.

[0024] A fourth aspect of this application provides a computer-readable storage medium storing computer instructions for causing the computer to execute the water supply flow control method for a thermal power generating unit as described in the above embodiments.

[0025] A fifth aspect of this application provides a computer program product, including a computer program, which, when executed, is used to implement the above-described method for controlling the water supply flow of a thermal power generating unit.

[0026] This application embodiment can acquire feedwater flow data and equipment status data of the feedwater system of a thermal power generating unit. The actual feedwater flow rate of the system is estimated using the feedwater flow data, and an estimated value is obtained. Combined with the equipment status and the estimated value, the defensive protection actions of the feedwater system are determined and executed. This adjusts the actual feedwater flow rate of the system. Through quantitative assessment of equipment health status, latent faults such as performance degradation are identified, achieving early prevention by combining equipment health status and real-time data. This solves the technical problem in related technologies where the protection mechanism for feedwater system regulation is singular, triggering the boiler main protection only when the feedwater flow rate or steam drum water level reaches a dangerous threshold, easily leading to unplanned unit shutdowns and affecting unit operating efficiency.

[0027] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0028] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 This is a flowchart of a water supply flow control method for a thermal power generating unit according to an embodiment of this application; Figure 2 This is a schematic diagram illustrating the principle of a feedwater flow control method for a thermal power generating unit according to an embodiment of this application; Figure 3 This is a schematic diagram of a multi-level defense principle provided according to an embodiment of this application; Figure 4 This is a response timing diagram provided according to one embodiment of this application; Figure 5 This is a schematic diagram of the structure of a feedwater flow control device for a thermal power generating unit according to an embodiment of this application; Figure 6 This is a schematic diagram of the structure of an electronic device provided according to an embodiment of this application. Detailed Implementation

[0029] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0030] The following description, with reference to the accompanying drawings, outlines a method, apparatus, and electronic equipment for controlling the feedwater flow of a thermal power generating unit according to embodiments of this application. Addressing the technical problem mentioned in the background art, where the protection mechanism for feedwater system regulation is singular, triggering boiler main protection only when the feedwater flow or drum water level reaches a dangerous threshold, easily leading to unplanned unit shutdowns and affecting unit efficiency, this application provides a method for controlling the feedwater flow of a thermal power generating unit. In this method, feedwater flow data and equipment status data of the thermal power generating unit's feedwater system can be acquired. The actual feedwater flow of the feedwater system is estimated using the feedwater flow data, obtaining an estimated value. Combining the equipment status and the estimated value, the defensive protection action of the feedwater system is determined and executed, adjusting the actual feedwater flow of the feedwater system. Through quantitative assessment of equipment health status, hidden faults such as performance degradation are identified, achieving early prevention by combining equipment health status and real-time data. This solves the technical problem in the related art where the protection mechanism for feedwater system regulation is singular, triggering boiler main protection only when the feedwater flow or drum water level reaches a dangerous threshold, easily leading to unplanned unit shutdowns and affecting unit efficiency.

[0031] Specifically, Figure 1 This is a schematic flowchart of a method for controlling the feedwater flow of a thermal power generating unit, provided in an embodiment of this application.

[0032] like Figure 1 As shown, the feedwater flow control method for this thermal power generating unit includes the following steps: In step S101, the water supply flow rate data and equipment status data of the water supply system of the thermal power generating unit are obtained.

[0033] In actual implementation, the embodiments of this application can obtain water supply flow data of the water supply system, vibration, bearing temperature, speed of the water supply pump set, valve position feedback of the regulating valve and driving torque and other equipment status data, so as to combine the water supply flow data and equipment status data to make early judgment on the adjustment of water supply flow and achieve early prevention.

[0034] In addition, the embodiments of this application can also collect system-level operating data such as steam drum water level, main steam flow rate, unit load, and deaerator parameters to assist the embodiments of this application in determining corresponding defense and protection actions.

[0035] Optionally, in one embodiment of this application, the water flow data is collected by at least three flow meters arranged in parallel. After acquiring the water flow data of the feedwater system of the thermal power generating unit, the method further includes: selecting any two flow meters from the water flow data, calculating the corresponding flow data deviation values, until the calculation of the water flow data collected by all flow meters is completed, and obtaining multiple flow data deviation values; comparing the multiple flow data deviation values ​​with a preset flow data deviation threshold to determine whether the water flow data meets the preset confidence conditions; if the preset confidence conditions are met, calculating the estimated value of the water flow of the feedwater system based on the water flow data; if the preset confidence conditions are not met, determining the data acquisition fault source based on the multiple flow data deviation values ​​and the preset flow data deviation threshold, and determining the target water flow data for calculating the estimated value based on the data acquisition fault source, or generating a corresponding early warning signal based on the data acquisition fault source.

[0036] In actual implementation, the embodiments of this application can employ at least three flow meters with different measurement principles (orifice plate type, ultrasonic type, electromagnetic type) arranged in parallel to achieve cross-validation and redundant backup of measurement data.

[0037] For example, embodiments of this application can calculate a first flow data deviation value between a first measured value collected by an orifice plate flow meter and a second measured value collected by an ultrasonic flow meter, calculate a second flow data deviation value between the first measured value and a third measured value collected by an electromagnetic flow meter, calculate a third flow data deviation value between the second measured value and the third measured value, and compare the first flow data deviation value, the second flow data deviation value, and the third flow data deviation value with a flow data deviation threshold (e.g., ±2%). If all of them are less than the flow data deviation threshold, it means that all the data are valid and the confidence condition is met, and subsequent calculations can be performed using the collected data.

[0038] If there is a flow data deviation value that is less than the flow data deviation threshold, it means that the data collected by the two flow meters corresponding to that flow data deviation value is valid, and the data collected by these two flow meters will be used for subsequent calculations.

[0039] If there is no flow data deviation value less than the flow data deviation threshold, it indicates that the flow meters are all abnormal and it is difficult to obtain accurate flow data. At this time, an early warning can be triggered so that the flow meters can be replaced in time.

[0040] In step S102, an estimated value of the water supply flow rate of the water supply system is calculated based on the water supply flow rate data.

[0041] The embodiments of this application can calculate the corresponding estimated value by collecting water flow data.

[0042] For example, embodiments of this application can preprocess water flow data to remove noise. For data collected by different flow meters, embodiments of this application can use DS evidence theory to fuse multi-source data and output highly reliable measured water flow values, i.e., estimated values.

[0043] In step S103, the equipment health index of the water supply system is calculated using equipment status data and estimated water flow rate.

[0044] Optionally, in one embodiment of this application, the equipment health index of the water supply system is calculated using equipment status data and estimated water flow rate, including: constructing a corresponding digital twin model based on the system parameters of the water supply system; calculating the actual efficiency of the water supply system using the estimated values ​​and the current speed of the water supply pump; and calculating the equipment health index of the water supply system using the actual efficiency and the rated efficiency of the water supply system.

[0045] This application embodiment can establish digital twin models of key equipment in a water supply system, compare actual operating data with model predictions in real time, and calculate the equipment health index. Health Index = 1 - (|Actual Efficiency - Rated Efficiency| / Rated Efficiency).

[0046] The actual efficiency can be calculated using real-time collected feedwater pump speed and combined flow rate data (verified for reliability through flow rate comparison) (Actual efficiency = actual output power / input power, where actual output power is calculated from flow rate and head). The rated efficiency can be the feedwater pump design rated efficiency built into the digital twin model. The health index ranges from 0 to 1; a value closer to 1 indicates better equipment health, while a value closer to 0 indicates more severe equipment deterioration.

[0047] In step S104, the defensive protection actions of the water supply system are determined by combining the equipment health index, the estimated value of the water supply flow rate and the equipment status data, so as to execute the defensive protection actions and adjust the actual water supply flow rate of the water supply system.

[0048] As one possible approach, embodiments of this application can combine equipment health index, estimated water flow rate, and equipment status data to comprehensively determine the corresponding defense level, and then determine the corresponding defense protection action based on different defense levels.

[0049] The defense level can be divided into three levels: early warning, compensation, and protection.

[0050] At the early warning level, it is mainly used to issue an early warning when a performance deviation is detected but has not yet affected the normal operating efficiency of the thermal power unit. The early warning can be given through lights, sound, etc., so that technicians can quickly find the abnormality and deal with it in a timely manner.

[0051] At the compensation level, it is mainly used to activate backup equipment in advance to compensate when abnormal flow is detected, which may affect the normal operation of thermal power units, so as to ensure the flow and enable thermal power units to maintain normal operation. At the same time, it can provide reminders through lights, sound and other means.

[0052] At the maintenance level, it is mainly used for system maintenance in emergency situations to reduce the load on thermal power units, match unit operation with water supply capacity, ensure safe and stable unit operation, and buy time for troubleshooting and recovery.

[0053] Optionally, in one embodiment of this application, the defense and protection actions of the water supply system are determined by combining the equipment health index, the estimated value of the water supply flow rate, and the equipment status data. This includes: using a digital twin model and equipment status data to predict the current rated flow rate of the water supply system at the current speed of the water supply pump; calculating the flow rate difference between the current rated flow rate and the estimated value; and combining the flow rate difference, equipment status parameters, and equipment health index to determine the defense and protection actions of the water supply system.

[0054] This application embodiment can obtain the current rotational speed through equipment status data, and then use a digital twin model to predict the current rated flow rate at the current rotational speed. By comparing the rated flow rate under theoretical conditions with the estimated value calculated from the actual flow rate, the flow rate difference is determined. The flow rate difference is used to determine whether the actual water supply system cannot supply water in the optimal state, and whether the current water supply flow rate can match the operation of the thermal power unit. Furthermore, by combining the flow rate difference, equipment status parameters, and equipment health index, it is determined what kind of defense and protection actions need to be performed.

[0055] Optionally, in one embodiment of this application, the defense protection action of the water supply system is determined by combining the flow difference, equipment status parameters, and equipment health index, including: obtaining the response delay of the regulating valve, the actual opening degree of the regulating valve, and the output of a single water supply pump based on the equipment status parameters; determining the desired opening degree of the regulating valve based on the flow command, and obtaining the opening degree difference by combining the desired opening degree and the actual opening degree; determining the defense protection action as a first-level defense protection action when the flow difference is greater than a preset difference threshold, or the equipment health index is less than a preset index threshold, or the regulating valve response delay is greater than a preset delay threshold, so as to generate a flow warning signal; determining the defense protection action as a second-level defense protection action when the estimated value is less than a preset lower limit of operating flow, or the output of a single water supply pump is greater than or equal to a preset upper limit of output, or the opening degree difference is greater than a preset opening degree difference threshold, so as to start the standby water supply pump, switch the regulating channel to the standby regulating channel, and adjust the water supply pump speed to a preset speed.

[0056] In actual implementation, the embodiments of this application can obtain equipment-related parameters of the water supply system from the equipment status parameters, such as the response of the regulating valve, the opening degree of the regulating valve, and the processing of the water pump. Then, by the difference between the parameters set in the flow command and the actual parameters of the equipment, data such as the opening degree difference of the regulating valve and the response delay can be obtained.

[0057] Furthermore, in this embodiment of the application, corresponding defense and protection actions can be matched based on data such as opening difference, flow difference, regulating valve response delay, and output of a single feedwater pump.

[0058] The Level 1 defense protection action (early warning level) can be triggered after any of the following conditions are met: Water supply flow deviation exceeds a certain threshold, such as exceeding 5% for 30 seconds; equipment health index is below a certain threshold, such as 0.90; regulating valve response delay exceeds the set threshold.

[0059] Upon triggering, this embodiment of the application can trigger an audible and visual alarm, push operational guidance information to technical personnel, simultaneously push pre-set prevention and control measures suggestions, and remind technical personnel to promptly investigate the cause of the abnormality.

[0060] The secondary defense protection action (compensation level) can be triggered after any of the following conditions are met: The water supply flow rate is lower than the normal operating limit; the output of a single water supply pump reaches the upper limit; the deviation between the opening of the regulating valve and the flow command exceeds a certain threshold, such as 10%.

[0061] Upon triggering, this embodiment of the application can start the backup water supply pump to increase the overall output of the water supply system; switch to the backup adjustment channel to ensure the normal function of flow regulation; adjust the speed of the running water supply pump to perform precise compensation of water supply flow, and quickly restore the water supply flow to the normal operating range to avoid the abnormality from escalating to the protection level.

[0062] Optionally, in one embodiment of this application, after performing the secondary defense protection action, the method further includes: calculating a new estimated value; determining the trend of water flow change based on the new estimated value; and calculating the corresponding water flow change value if the trend is downward; if the water flow change value is greater than a preset change threshold, determining the load reduction rate of the thermal power generating unit based on the water flow change value; calculating the target load of the thermal power generating unit based on the new estimated value; generating a load reduction command for the thermal power generating unit by combining the system load reduction rate and the target load; and adjusting the operating load of the thermal power generating unit using the load reduction command.

[0063] After the secondary defense protection action is triggered, the embodiments of this application can determine whether further protection needs to be triggered based on changes in the water supply system.

[0064] In this application embodiment, preservation can be triggered after all of the following conditions are met: The water supply flow rate drops rapidly to a dangerous threshold (e.g., 10% above the MFT setpoint); the secondary defense protection mechanism is unable to maintain stable flow.

[0065] Upon triggering, this embodiment of the application can adaptively adjust the load reduction rate according to the rate of decrease in water flow to avoid excessive load reduction from impacting the unit; it can automatically calculate the target load based on the current water supply capacity to ensure that the unit operation matches the water supply capacity, and at the same time trigger the whole system collaborative protection, monitor various parameters of the unit in real time, ensure the safe and stable operation of the unit, and buy time for fault diagnosis and recovery.

[0066] Combination Figures 2 to 4 As shown, the working principle of the water supply flow control method for a thermal power generating unit according to an embodiment of this application will be described in detail.

[0067] In actual implementation, the working principle of the embodiments of this application can be as follows: Figure 2 As shown, by monitoring the flow rate and equipment status of the water supply system, this embodiment of the application can perform data fusion and multi-source verification on the parallel collected water supply flow data, and then make decisions by combining the highly reliable water supply flow data and equipment status data to determine the defense and protection actions that need to be performed.

[0068] Specifically, in the data acquisition process of this application embodiment, at least three flow meters with different measurement principles (orifice plate type, ultrasonic type, and electromagnetic type) can be arranged in parallel to achieve cross-validation and redundant backup of the measurement data. Real-time monitoring is performed on key parameters such as vibration, bearing temperature, and rotational speed of the feedwater pump unit, as well as valve position feedback and driving torque of the regulating valve. System-level operating data such as steam drum water level, main steam flow rate, unit load, and deaerator parameters are collected.

[0069] Based on the parallel-acquired water flow data, the embodiments of this application can use DS evidence theory to fuse multi-source data, eliminate measurement noise, and output highly reliable measured water flow values.

[0070] Furthermore, embodiments of this application can perform equipment health status assessments. For example, based on the performance baseline curve of the water pump, the equipment health index can be calculated in real time to identify performance degradation trends; or, through digital twin technology, the corresponding equipment health index can be calculated in combination with equipment status parameters.

[0071] Based on equipment health index, water flow data, and other factors, comprehensive defensive safety actions are determined.

[0072] like Figure 3 As shown, Level 1 defense protection action (early warning level) can be triggered after any of the following conditions are met: Water supply flow deviation exceeds a certain threshold, such as exceeding 5% for 30 seconds; equipment health index is below a certain threshold, such as 0.90; regulating valve response delay exceeds the set threshold.

[0073] For Level 1 defense protection actions, an audible and visual alarm can be triggered, operational guidance information can be pushed to technical personnel, and suggestions for pre-set prevention and control measures can be pushed simultaneously to remind technical personnel to promptly investigate the cause of the anomaly.

[0074] The secondary defense protection action (compensation level) can be triggered after any of the following conditions are met: The water supply flow rate is lower than the normal operating limit; the output of a single water supply pump reaches the upper limit; the deviation between the opening of the regulating valve and the flow command exceeds a certain threshold, such as 10%.

[0075] For Level 2 protection actions, the backup water pump can be started to increase the overall output of the water supply system; switch to the backup regulation channel to ensure that the flow regulation function is normal; adjust the speed of the running water pump to perform precise compensation of the water supply flow, and quickly restore the water supply flow to the normal operating range to avoid the abnormality from escalating to the protection level.

[0076] Level 3 defensive protection actions can be triggered after all of the following conditions are met: For the three-level defense protection action, the load reduction rate can be adaptively adjusted according to the rate of decrease in water flow to avoid the impact on the unit caused by excessively rapid load reduction; the target load can be automatically calculated in combination with the current water supply capacity to ensure that the unit operation matches the water supply capacity, and at the same time, the whole system coordinated protection is triggered to monitor various parameters of the unit in real time, ensuring the safe and stable operation of the unit and buying time for fault diagnosis and recovery.

[0077] Furthermore, embodiments of this application can also record process data for each protection action, and optimize defense thresholds and response strategies through machine learning algorithms to achieve self-learning and self-optimization of the protection system.

[0078] Based on the above principles, such as Figure 4 As shown, this application embodiment uses a three-level defense mechanism to provide early warning and intervention before a fault occurs, avoiding uninterrupted accidents caused by insufficient water supply flow, thus reducing uninterrupted accidents and improving equipment reliability.

[0079] The implementation effects of the embodiments of this application will be illustrated by the following examples.

[0080] In terms of configuration, taking a 600MW supercritical unit as an example, the embodiments of this application can be configured to install one orifice plate flow meter, one ultrasonic flow meter, and one electromagnetic flow meter on the main water supply pipeline, and install a vibration sensor (0-10mm / s), a bearing temperature sensor (0-150℃), and a speed sensor on the water supply pump set, and install a high-precision valve position sensor (±0.1% accuracy) and a torque sensor on the regulating valve.

[0081] Furthermore, by using industrial-grade servers and installing dedicated intelligent protection software, it can be used for data fusion, health assessment, defense decision-making, and to establish a digital twin model of the water supply system to simulate the system's operating status in real time.

[0082] The feedwater pump control can use a redundant PLC (Programmable Logic Controller) system, which communicates with the unit's DCS (Distributed Control System) system through hard-wiring and OPC (OLE for Process Control). The fast load reduction command uses hard-wiring to ensure a response time of <100ms.

[0083] Based on the above configuration, when the unit is operating at a load of 450MW, the performance of the A steam-driven feedwater pump deteriorates.

[0084] The protection process can be as follows: At 13:00:00, it was detected that the efficiency of pump A decreased from 85% to 82%. At 13:00:05, the health index was calculated to be 0.94, triggering Level 1 defense; At 13:00:10, an early warning was issued for "Pump A performance deterioration," and operators were advised to strengthen monitoring. At 13:15:30, the load increased to 480MW, and the efficiency of pump A further decreased to 80%. At 13:15:35, a 3% deviation in water supply flow rate triggered a level-two defense. At 13:15:40, electric water pump B started automatically, and the flow rate returned to normal. 13:16:00 Maintenance recommendation generated: "Pump A needs to be inspected and maintained within 24 hours".

[0085] Based on the above protection process, insufficient water flow caused by the deterioration of the feedwater pump performance was successfully avoided, and the unit maintained stable operation.

[0086] If the above-mentioned protection process fails to effectively resolve the problem after secondary protection, and the decrease in water supply flow exceeds a certain threshold, then tertiary protection can be implemented. Furthermore, for more urgent situations, such as power outages, this embodiment can directly skip secondary protection and implement tertiary protection to avoid unauthorized outages.

[0087] For example, when the unit is operating at a load of 550MW, the feedwater pump suddenly trips.

[0088] The protection process can be as follows: At 14:20:00, the feedwater pump tripped, and the feedwater flow rate dropped sharply from 1800 t / h. At 14:20:01, an abnormal traffic pattern was detected, and the credibility assessment confirmed the fault was real. 14:20:02 Skip level 2 defense and directly trigger level 3 defense; At 14:20:03, the command to "rapidly reduce the load to 300MW" was sent. At 14:20:04, the standby water supply pump was started simultaneously; At 14:20:30, the unit load dropped to 300MW, and the feedwater flow rate stabilized at 1000t / h; At 14:20:35, the status returned to normal, avoiding MFT (Master Fuel Trip) action.

[0089] Through the above process, in the emergency situation of feedwater pump tripping, the unit operation was preserved by rapidly reducing the load, thus avoiding unplanned outages.

[0090] The feedwater flow control method for thermal power generating units proposed in this application can acquire feedwater flow data and equipment status data of the feedwater system of the thermal power generating unit. The actual feedwater flow of the feedwater system is estimated using the feedwater flow data to obtain an estimated value. Combined with the equipment status and the estimated value, the defensive protection actions of the feedwater system are determined and executed. This adjusts the actual feedwater flow of the feedwater system. Through quantitative assessment of equipment health status, hidden faults such as performance degradation are identified, achieving early prevention by combining equipment health status and real-time data. This solves the technical problem in related technologies where the protection mechanism for feedwater system regulation is singular, triggering the boiler main protection only when the feedwater flow or steam drum water level reaches a dangerous threshold, easily leading to unplanned unit shutdowns and affecting unit operating efficiency.

[0091] Next, the water supply flow control device for a thermal power generating unit according to an embodiment of this application is described with reference to the accompanying drawings.

[0092] Figure 5 This is a block diagram of the water supply flow control device for a thermal power generator set according to an embodiment of this application.

[0093] like Figure 5 As shown, the feedwater flow control device 10 of the thermal power generating unit includes: Specifically, the acquisition module 100 is used to acquire water flow data and equipment status data of the water supply system of the thermal power generating unit.

[0094] The first calculation module 200 is used to calculate the estimated value of the water supply flow of the water supply system based on the water supply flow data.

[0095] The second calculation module 300 is used to calculate the equipment health index of the water supply system using equipment status data and estimated water flow.

[0096] The first control module 400 is used to combine the equipment health index, the estimated value of the water supply flow rate and the equipment status data to determine the defense and protection actions of the water supply system, so as to execute the defense and protection actions and adjust the actual water supply flow rate of the water supply system.

[0097] Optionally, in one embodiment of this application, the water supply flow data is collected by at least three flow meters arranged in parallel, and the water supply flow control device 10 for the thermal power generating unit further includes: The third calculation module is used to select any two flow meters from the water supply flow data and calculate the corresponding flow data deviation value until the calculation of water supply flow data collected by all flow meters is completed, thus obtaining multiple flow data deviation values.

[0098] The judgment module is used to compare multiple flow data deviation values ​​with a preset flow data deviation threshold to determine whether the water supply flow data meets the preset reliability conditions.

[0099] The second control module is used to calculate the estimated value of the water supply flow rate of the water supply system based on the water supply flow rate data, provided that the preset confidence conditions are met.

[0100] The third control module is used to determine the data acquisition fault source based on multiple flow data deviation values ​​and a preset flow data deviation threshold when the preset confidence conditions are not met. The target water supply flow data for calculating the estimated value is determined based on the data acquisition fault source, or a corresponding early warning signal is generated based on the data acquisition fault source.

[0101] Optionally, in one embodiment of this application, the second computing module 300 includes: Among them, the construction unit is used to build a corresponding digital twin model based on the system parameters of the water supply system.

[0102] The first calculation unit is used to calculate the actual efficiency of the water supply system using the estimated value and the current speed of the water supply pump.

[0103] The second calculation unit is used to calculate the equipment health index of the water supply system using the actual efficiency and the rated efficiency of the water supply system.

[0104] Optionally, in one embodiment of this application, the first control module 400 includes: The prediction unit is used to predict the current rated flow rate of the water supply system at the current speed of the water supply pump using a digital twin model and equipment status data.

[0105] The third calculation unit is used to calculate the flow difference between the current rated flow and the estimated value.

[0106] The determination unit is used to combine flow difference, equipment status parameters and equipment health index to determine the defense and protection actions of the water supply system.

[0107] Optionally, in one embodiment of this application, the determining unit includes: The acquisition subunit is used to acquire the response delay of the regulating valve, the actual opening degree of the regulating valve, and the output of a single water pump in the water supply system based on the equipment status parameters.

[0108] The first calculation subunit is used to determine the desired opening degree of the control valve in the water supply system based on the flow command, and to obtain the opening degree difference by combining the desired control valve opening degree and the actual control valve opening degree.

[0109] The first determining subunit is used to determine the defense protection action as a level one defense protection action and generate a flow warning signal when the flow difference is greater than a preset difference threshold, or the equipment health index is less than a preset index threshold, or the control valve response delay is greater than a preset delay threshold.

[0110] The second determining subunit is used to determine the defense protection action as a secondary defense protection action when the estimated value is less than the preset lower limit of the operating flow rate, or the output of a single water pump is greater than or equal to the preset upper limit of the output, or the opening difference is greater than the preset opening difference threshold. This action is used to start the standby water pump, switch the adjustment channel to the standby adjustment channel, and adjust the water pump speed to the preset speed.

[0111] Optionally, in one embodiment of this application, the determining unit further includes: The second calculation subunit is used to calculate a new estimate, determine the trend of water flow rate change based on the new estimate, and calculate the corresponding change value of water flow rate when the trend is downward.

[0112] The control subunit is used to determine the load reduction rate of the thermal power generating unit based on the change in water flow when the change in water flow exceeds a preset threshold, calculate the target load of the thermal power generating unit based on the new estimated value, generate a load reduction command for the thermal power generating unit by combining the system load reduction rate and the target load, and adjust the operating load of the thermal power generating unit using the load reduction command.

[0113] It should be noted that the foregoing explanation of the embodiment of the water supply flow control method for thermal power generating units also applies to the water supply flow control device of the thermal power generating unit in this embodiment, and will not be repeated here.

[0114] The feedwater flow control device for thermal power generating units proposed in this application can acquire feedwater flow data and equipment status data of the feedwater system of the thermal power generating unit. It estimates the actual feedwater flow of the feedwater system using the feedwater flow data, obtains an estimated value, and combines the equipment status and the estimated value to determine the defensive protection actions of the feedwater system. This action is then executed to adjust the actual feedwater flow of the feedwater system. Through quantitative assessment of equipment health status, it identifies latent faults such as performance degradation, achieving early prevention by combining equipment health status and real-time data. This solves the technical problem in related technologies where the protection mechanism for feedwater system regulation is singular, triggering the boiler main protection only when the feedwater flow or steam drum water level reaches a dangerous threshold, easily leading to unplanned unit shutdowns and affecting unit operating efficiency.

[0115] Figure 6 A schematic diagram of the structure of an electronic device provided in an embodiment of this application. The electronic device may include: The memory 601, the processor 602, and the computer program stored on the memory 601 and capable of running on the processor 602.

[0116] When the processor 602 executes the program, it implements the water supply flow control method for thermal power generating units provided in the above embodiments.

[0117] Furthermore, electronic devices also include: Communication interface 603 is used for communication between memory 601 and processor 602.

[0118] The memory 601 is used to store computer programs that can run on the processor 602.

[0119] The memory 601 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk storage device.

[0120] If the memory 601, processor 602, and communication interface 603 are implemented independently, then the communication interface 603, memory 601, and processor 602 can be interconnected via a bus to complete communication between them. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc. For ease of representation, Figure 6 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0121] Optionally, in a specific implementation, if the memory 601, processor 602, and communication interface 603 are integrated on a single chip, then the memory 601, processor 602, and communication interface 603 can communicate with each other through an internal interface.

[0122] The processor 602 may be a central processing unit (CPU), an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of this application.

[0123] This embodiment also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described method for controlling the water supply flow of a thermal power generating unit.

[0124] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the water supply flow control method for thermal power generating units provided in this embodiment of the invention.

[0125] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0126] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0127] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or N executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

[0128] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0129] It should be understood that the various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0130] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0131] Furthermore, the functional units in the various embodiments of this application can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0132] The storage medium mentioned above can be a read-only memory, a disk, or an optical disk, etc. Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.

Claims

1. A method for controlling the feedwater flow of a thermal power generating unit, characterized in that, Includes the following steps: Acquire water flow data and equipment status data of the water supply system of thermal power generating units; Calculate the estimated value of the water supply flow rate of the water supply system based on the water supply flow rate data; Using the equipment status data and the estimated water flow rate, the equipment health index of the water supply system is calculated; By combining the equipment health index, the estimated water flow rate, and the equipment status data, the defense and protection actions of the water supply system are determined, and the defense and protection actions are executed to adjust the actual water flow rate of the water supply system.

2. The method according to claim 1, characterized in that, The water supply flow data is collected by at least three flow meters installed in parallel. After acquiring the water supply flow data of the feedwater system of the thermal power generating unit, the following is also included: From the water supply flow data, select any two flow meters to collect water supply flow data, calculate the corresponding flow data deviation value, and continue until the calculation of water supply flow data collected by all flow meters is completed, to obtain multiple flow data deviation values; By comparing the multiple flow data deviation values ​​with a preset flow data deviation threshold, it is determined whether the water supply flow data meets the preset confidence conditions. If the preset confidence condition is met, then the estimated value of the water supply flow of the water supply system is calculated based on the water supply flow data; If the preset confidence condition is not met, the data acquisition fault source is determined based on the multiple flow data deviation values ​​and the preset flow data deviation threshold. The target water supply flow data used to calculate the estimated value is determined based on the data acquisition fault source, or a corresponding early warning signal is generated based on the data acquisition fault source.

3. The method according to claim 1, characterized in that, The step of calculating the equipment health index of the water supply system using the equipment status data and the estimated water flow rate includes: Based on the system parameters of the water supply system, a corresponding digital twin model is constructed; Using the estimated value and the current speed of the water supply pump in the water supply system, the actual efficiency of the water supply system is calculated; The equipment health index of the water supply system is calculated using the actual efficiency and the rated efficiency of the water supply system.

4. The method according to claim 3, characterized in that, The determination of the defensive protection actions of the water supply system by combining the equipment health index, the estimated water flow rate, and the equipment status data includes: Using the digital twin model and the equipment status data, the current rated flow rate of the water supply system at the current speed of the water supply pump in the water supply system is predicted; Calculate the flow difference between the current rated flow and the estimated value; By combining the flow difference, the equipment status parameters, and the equipment health index, the defense and protection actions of the water supply system are determined.

5. The method according to claim 4, characterized in that, The determination of the defense and protection actions of the water supply system by combining the flow difference, the equipment status parameters, and the equipment health index includes: Based on the equipment status parameters, the response delay of the regulating valve, the actual opening degree of the regulating valve, and the output of a single water supply pump of the water supply system are obtained. The desired opening degree of the regulating valve in the water supply system is determined based on the flow command, and the opening degree difference is obtained by combining the desired opening degree and the actual opening degree of the regulating valve. If the flow difference is greater than a preset difference threshold, or the device health index is less than a preset index threshold, or the control valve response delay is greater than a preset delay threshold, the defense protection action is determined to be a level one defense protection action to generate a flow warning signal. If the estimated value is less than the preset lower limit of the operating flow rate, or the output of the single water pump is greater than or equal to the preset upper limit of the output, or the opening difference is greater than the preset opening difference threshold, the defense protection action is determined to be a secondary defense protection action, so as to start the standby water pump, switch the adjustment channel to the standby adjustment channel, and adjust the water pump speed to the preset speed.

6. The method according to claim 5, characterized in that, After performing the aforementioned secondary defense protection action, the following is also included: Calculate a new estimate, determine the trend of the water supply flow rate based on the new estimate, and calculate the corresponding change in water supply flow rate if the trend is downward. If the change in water supply flow rate is greater than a preset change threshold, the load reduction rate of the thermal power generating unit is determined based on the change in water supply flow rate. The target load of the thermal power generating unit is calculated based on the new estimated value. The load reduction command of the thermal power generating unit is generated by combining the system load reduction rate and the target load, and the operating load of the thermal power generating unit is adjusted using the load reduction command.

7. A feedwater flow control device for a thermal power generating unit, characterized in that, include: The acquisition module is used to acquire water flow data and equipment status data of the water supply system of thermal power generating units; The first calculation module is used to calculate an estimated value of the water supply flow of the water supply system based on the water supply flow data; The second calculation module is used to calculate the equipment health index of the water supply system using the equipment status data and the estimated value of the water supply flow rate. The control module is used to combine the equipment health index, the estimated value of the water supply flow rate, and the equipment status data to determine the defense and protection actions of the water supply system, so as to execute the defense and protection actions and adjust the actual water supply flow rate of the water supply system.

8. An electronic device, characterized in that, include: A memory, a processor, and a computer program stored in the memory and capable of running on the processor, the processor executing the program to implement the feedwater flow control method for a thermal power generating unit as described in any one of claims 1-6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, The program is executed by the processor to implement the feedwater flow control method for thermal power generating units as described in any one of claims 1-6.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed, it is used to implement the water supply flow control method for thermal power generating units as described in any one of claims 1-6.

Images