Water pump pressure control system and method based on NB-IOT

Abstract

The present invention discloses a feedwater pump pressure control system and method based on NB-IOT, which belongs to the field of pressure control technology and includes a data acquisition module, a communication module, an intelligent control module and a feedback evaluation module; the data acquisition module is used to collect multi-dimensional data of the feedwater pump and its operating environment in real time; the communication module is used to build a data transmission channel, and receive and transmit data and instructions in each module in real time; the intelligent control module is used to dynamically generate target pressure instructions to ensure that the feedwater pump can operate stably under various working conditions in the thermal power plant, and synchronously and adaptively control the medium temperature, effectively preventing the feedwater pump from being damaged by overheating and avoiding waste of resources; the feedback evaluation module is used to comprehensively evaluate the pressure regulation effect after the pressure regulation is completed. If the evaluation result is not ideal, the pressure model is updated and readjusted to improve the overall operation quality of the thermal power generation system.

Description

Technical Field

[0001] The present invention relates to a water supply pump pressure control system and method based on NB-IOT, belonging to the technical field of pressure control. Background Art

[0002] At present, my country's energy structure is still dominated by coal, especially in electricity production. In thermal power plants, feedwater pumps play an indispensable role, on the one hand, responsible for circulating cooling, and on the other hand, continuously delivering water to the boiler.

[0003] The existing Chinese patent with authorization announcement number CN112483425B discloses a constant-speed water supply pump pressure regulating device and operation method. The device includes a water supply pipe, a starting water supply pipe and a deaerator. The deaerator is arranged at the starting end of the water supply pipe and the starting water supply pipe, and the No. 3 high-pressure heater is arranged at the end of the water supply pipe and the starting water supply pipe; a first electric gate valve, a pneumatic water supply pump pre-pump, a pneumatic water supply pump, a first pressure transmitter, a first temperature transmitter and a second electric gate valve are arranged in sequence along the flow direction of the medium on the water supply pipe; a third electric gate valve, an electric constant-speed water supply pump, a second pressure transmitter, a second temperature transmitter, a fourth electric gate valve and a first pneumatic regulating valve are arranged in sequence along the flow direction of the medium on the starting water supply pipe.

[0004] Although the existing technology solves the problem of excessive head of electric fixed-speed pumps, and can adjust the pressure of the starting water supply pipeline and the pressure of the main water supply pipeline, so that the pneumatic water supply pump can be smoothly connected to the grid without affecting the normal operation of the power plant, it does not take into account the adaptive ability and pressure regulation effect of pressure regulation, especially the specific requirements of the actual operating conditions of the thermal power plant for the pressure regulation of the water supply pump. For example, during the thermal power generation process, the huge heat generated by combustion will directly affect the working environment and performance of the water supply pump, including the pump body temperature, the medium temperature and the pressure fluctuations caused by it. In addition, there is a lack of comprehensive evaluation of the regulation effect, making it difficult to ensure that the pressure regulation measures have truly achieved the expected results. Therefore, this application provides a water supply pump pressure regulation system and method based on NB-IOT. Summary of the Invention

[0005] In response to the shortcomings of the existing technology, the purpose of the present invention is to provide a water feed pump pressure control system and method based on NB-IOT. According to the actual operation data, the target pressure instructions are dynamically generated and issued to accurately adjust the working pressure of the water feed pump to adapt to the demand changes under different operating conditions of the thermal power plant. At the same time, a mechanism for synchronous adjustment of pressure regulation and temperature changes is designed to automatically adjust the cooling water flow or take other temperature control measures to effectively prevent damage to the water feed pump caused by excessively high circulating water temperature. By comparing the effects before and after adjustment, an evaluation report is automatically generated to ensure that the pressure control of the water feed pump is always in the best state.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The NB-IOT-based water pump pressure control system includes: data acquisition module, communication module, intelligent control module and feedback evaluation module;

[0008] The data acquisition module is used to collect multi-dimensional data of the water supply pump and its operating environment in real time;

[0009] The communication module is used to build a data transmission channel to receive and transmit data and instructions in each module in real time;

[0010] The intelligent control module is used to dynamically generate target pressure instructions and synchronously and adaptively control the medium temperature;

[0011] The feedback evaluation module is used to perform a comprehensive evaluation on the pressure regulation effect after the pressure regulation is completed.

[0012] Specifically, the intelligent control module includes a voltage control unit and a temperature control unit;

[0013] The pressure control unit is used to calculate the optimal pressure value required by the water supply pump, and convert the optimal pressure value into a corresponding control signal to generate a target pressure instruction;

[0014] The temperature control unit is used to monitor the temperature of the medium after passing through the boiler in real time while adjusting the pressure, and to determine temperature anomalies.

[0015] Specifically, the steps of generating the target pressure instruction include:

[0016] Construct a global feature vector , and construct a data set based on several samples of the global feature vector ;in, is the optimal pressure value for the water pump, is the target feature vector, is the number of samples in the dataset, For the dataset No. samples containing the global feature vector, ;

[0017] Use support vector machine to build pressure model and set the regression function of pressure model;

[0018] Dividing the data set into a training set and a validation set, defining a training objective as minimizing a structural risk function, and training and validating the stress model;

[0019] Obtain target feature vector in real time , using the pressure model to generate the optimal pressure value , and calculate the pressure change ;in, is the actual pressure value;

[0020] Set the pressure adjustment interval to , and calculate the rate of pressure increase or decrease , generate target pressure instructions.

[0021] Specifically, the specific steps of determining temperature anomaly include:

[0022] Set the normal range of water output to ;in, is the lower limit of the outlet water temperature, The upper limit of the outlet water temperature;

[0023] Get the actual medium temperature in real time , judging whether the actual medium temperature exceeds the normal range of the water outlet;

[0024] like , the actual medium temperature is normal, and the established cooling operation is performed;

[0025] like , the actual medium temperature is too high, and a cooling adjustment is performed;

[0026] like , the actual medium temperature is too low, and temperature increase regulation is performed.

[0027] Specifically, the specific steps of temperature reduction regulation include:

[0028] Set the cooling water pump flow rate to , the speed is , construct the functional expressions between flow rate and cooling effect, speed and flow rate;

[0029] Calculate the required increase in speed of the cooling water pump ;

[0030] After cooling, get the actual cooling temperature , and set the cooling temperature threshold to , judge whether the medium temperature is effectively reduced after passing through the cooling water tank;

[0031] like , the cooling effect is good, and the established stirring and cooling operation is performed;

[0032] like , the cooling effect is poor, and the stirring cooling is optimized.

[0033] Specifically, the specific steps for optimizing stirring cooling include:

[0034] Set the stirring motor speed to , construct the functional expression between the rotation speed and the stirring effect;

[0035] Calculate the increased speed of the stirring motor And adjust the speed of the stirring motor through the motor controller.

[0036] Specifically, the specific steps of temperature regulation include:

[0037] According to the actual medium temperature Calculate the required speed reduction of the cooling water pump based on the lower limit of the outlet water temperature .

[0038] Specifically, the feedback evaluation module is configured with a feedback strategy for evaluating the effect of pressure regulation;

[0039] The specific steps of the feedback strategy include:

[0040] Get the actual medium temperature at the water inlet of the water pump , and set the stable temperature range to ;in, is the lower limit of water inlet temperature, is the upper limit of water inlet temperature;

[0041] Use the time counter to obtain the time interval for the temperature to return to the stable temperature range ;

[0042] Record the maximum value of the medium temperature at the water inlet With minimum value , and calculate the temperature fluctuation amplitude after the temperature adjustment is completed ;

[0043] Record the maximum value of the water supply pump pressure and minimum value , and calculate the pressure fluctuation range after the temperature adjustment is completed ;

[0044] Calculate the coefficient of variation of flow ;in, is the average flow rate, is the standard deviation of the calculated flow rate;

[0045] Set the time threshold for the temperature to return to the normal range to , the temperature fluctuation amplitude threshold is , the pressure fluctuation range threshold is And the flow coefficient of variation threshold is , and construct a comprehensive scoring index ;

[0046] Setting comprehensive assessment thresholds , judge the overall operating status according to the value of the comprehensive scoring index; if , the operation is in good condition; if , the operating conditions are not good, update the pressure model and re-regulate the pressure.

[0047] The NB-IOT-based water pump pressure control method includes:

[0048] Real-time collection of multi-dimensional data on feedwater pumps and their operating environment during thermal power generation;

[0049] Dynamically generate and issue target pressure instructions, and synchronously and adaptively control the medium temperature;

[0050] After completing each pressure adjustment, evaluate the pressure adjustment effect.

[0051] Specifically, the steps for evaluating the effect of pressure adjustment include:

[0052] Get the actual medium temperature at the water inlet of the water pump , and set the stable temperature range;

[0053] Use the time counter to obtain the time interval for the temperature to return to the stable temperature range ;

[0054] Calculate the temperature fluctuation amplitude after temperature regulation is completed , pressure fluctuation range and the coefficient of variation of flow ;

[0055] Set the time threshold for the temperature to return to the normal range to , the temperature fluctuation amplitude threshold is , the pressure fluctuation range threshold is And the flow coefficient of variation threshold is , and construct a comprehensive scoring index ;

[0056] Setting comprehensive assessment thresholds , judge the overall operating status according to the value of the comprehensive scoring index; if , the operation is in good condition; if , the operating conditions are not good, update the pressure model and re-regulate the pressure.

[0057] Beneficial effects of the present invention:

[0058] The support vector machine algorithm is used to construct a pressure model and generate target pressure instructions to ensure that the feedwater pump can operate stably under different working conditions and meet the changing needs of power generation load. At the same time, the medium temperature is adaptively controlled. The medium temperature is obtained in real time through temperature sensors arranged at key positions, and the temperature is accurately determined whether it is abnormal. The temperature is adjusted to ensure that the medium temperature is within a reasonable range, prevent the feedwater pump from being damaged due to overheating, avoid waste of resources, and ensure its safe and efficient operation under various working conditions. After each pressure adjustment, the operating status of the feedwater pump is evaluated by constructing a comprehensive scoring index. If the evaluation result is not ideal, the pressure model is updated and readjusted. Through the closed-loop operation process, the system can continuously optimize its own control strategy, continuously improve the stability, safety and efficiency of the feedwater pump operation, thereby improving the overall operation quality of the thermal power generation system, reducing equipment loss and maintenance costs, and enhancing the economic benefits and reliability of the thermal power plant. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 This is the structural diagram of the water pump pressure control system based on NB-IOT;

[0060] Figure 2 Generate a target pressure instruction flow chart for the NB-IOT-based water pump pressure control system;

[0061] Figure 3 This is a flow chart for determining temperature anomalies in the water supply pump pressure control system based on NB-IOT;

[0062] Figure 4 This is a flow chart of the feedback strategy for the water pump pressure control system based on NB-IOT;

[0063] Figure 5 This is a flow chart of the water pump pressure control method based on NB-IOT. DETAILED DESCRIPTION

[0064] The technical solution of the present invention is described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present invention and the specific features in the embodiments are detailed descriptions of the technical solution of the present invention, rather than limitations on the technical solution of the present invention. In the absence of conflict, the embodiments of the present invention and the technical features in the embodiments can be combined with each other.

[0065] Example 1

[0066] refer to Figures 1 to 4 As shown, this embodiment introduces a water pump pressure control system based on NB-IOT, including: a data acquisition module, a communication module, an intelligent control module and a feedback evaluation module;

[0067] The data acquisition module is used to utilize various high-precision monitoring equipment in the thermal power generation process, such as sensors, pressure gauges, and flow meters, to collect multi-dimensional data of the feedwater pump and its operating environment in real time, including pressure data, flow data, temperature data, and other auxiliary data of the feedwater pump; pressure data reflects the working status and efficiency of the feedwater pump; flow data records real-time information on the amount of fluid transported; temperature data includes pump body temperature, medium temperature, and ambient temperature, which are used for subsequent instant temperature adjustment to avoid overheating risks and evaluate the working status of the feedwater pump. The medium temperature is the temperature of the fluid transported by the feedwater pump during the circulation process, which has an impact on the pump body material, sealing, and operating efficiency. For example, high-temperature medium may cause thermal expansion of the pump body material, decrease in strength, and even cause thermal fatigue of the material, while low-temperature medium may cause material embrittlement and increase the risk of fracture; other auxiliary data include the power generation load and steam parameters of the power plant, which are used to adjust the working pressure and flow of the feedwater pump;

[0068] The communication module uses NB-IOT technology to build a stable and high-speed data transmission channel. It transmits the information collected by the data acquisition module to the intelligent control module in real time. At the same time, it receives the control instructions issued by the intelligent control module and feeds them back to the water pump or other actuators. Through two-way data transmission and instruction delivery, real-time data transmission and instant response to instructions are achieved. In thermal power plants, due to the wide distribution of equipment and complex environments, there are many unfavorable factors such as electromagnetic interference. The wide coverage of the NB-IOT network can ensure stable communication in every corner of the thermal power plant.

[0069] The intelligent control module is used to receive the multi-dimensional data provided by the data acquisition module, process and analyze the data, dynamically generate and issue target pressure instructions, and synchronously and adaptively control the medium temperature. According to the temperature changes of the water supply pump and its surrounding environment, the cooling water flow in the cooling box is synchronously adjusted or other temperature control measures are taken. The cooling box is equipped with a cooling water pump to cool the fluid and realize heat exchange, ensuring that the medium temperature is maintained within the optimal range, effectively preventing the water supply pump from being damaged due to overheating, and ensuring that it is always in a safe and efficient operating state;

[0070] The feedback evaluation module is used to evaluate the pressure adjustment effect after each pressure adjustment. By obtaining the actual medium temperature at the water inlet of the water feed pump, a comprehensive scoring index is constructed, and the operating status is judged by comparing it with the comprehensive evaluation threshold. It is precisely judged whether the water feed pump is operating well. If not, the pressure model is updated and readjusted, thereby realizing dynamic optimization of pressure control, ensuring stable and efficient operation of the water feed pump, extending equipment life, and improving the reliability and safety of the entire thermal power generation system.

[0071] Specifically, the intelligent control module includes a voltage control unit and a temperature control unit;

[0072] The pressure control unit is used to conduct in-depth analysis and processing of the received multi-dimensional data, calculate the optimal pressure value required by the feedwater pump, and ensure that the feedwater pump can operate stably under various operating conditions in the thermal power plant. The optimal pressure value is converted into a corresponding control signal, generating a detailed and accurate target pressure instruction. The target pressure instruction is sent to the actuator of the feedwater pump, ensuring that the actuator can quickly and accurately adjust the operating status of the feedwater pump to meet the needs of the increased power generation load;

[0073] The temperature control unit is used to monitor the temperature of the medium after passing through the boiler in real time by using several temperature sensors arranged at specific locations, such as the temperature sensors at the rear pipe of the boiler, the cooling box and the semi-enclosed water tank, while the feed water pump is adjusting the pressure, and to make temperature abnormality judgments. Since the temperature of the fluid transported by the feed water pump will increase significantly after passing through the boiler, the fluid returns to the water inlet of the feed water pump through a series of cooling operations to form new boiler feed water. At the same time, after the pressure is adjusted, the boiling point of the fluid changes. When the feed water pump increases the fluid pressure, the fluid absorbs heat in the boiler, and due to the increase in boiling point, the fluid can It can reach higher temperatures without boiling and vaporizing. For example, under standard atmospheric pressure, the boiling point of water is 100°C, and when the pressure rises to a certain level (such as 1.5 standard atmospheric pressures), the boiling point of water may rise to about 110°C. At this time, in the boiler, the fuel combustion releases a large amount of heat. The fluid continues to absorb heat under this high-pressure environment, and the temperature will rise significantly. Maintaining the original cooling operation will result in an unsatisfactory cooling effect, resulting in the fluid being too hot when it reaches the water inlet of the feed pump, causing damage to the feed pump. Adaptive regulation can effectively avoid damage to the pump body material due to thermal stress.

[0074] Specifically, the steps of generating the target pressure instruction include:

[0075] The received multi-dimensional data is integrated, and the current real-time pressure value of the feedwater pump, the instantaneous flow data and various temperature data are combined with the current power generation load value of the thermal power plant and various steam parameters to construct a global feature vector. , and construct a data set reflecting the operating conditions of the water supply pump based on several samples of the global feature vector ;in, is the optimal pressure value for the water pump, is the target feature vector, , For traffic, is the pump body temperature, is the medium temperature, is the ambient temperature, is the power generation load, is the steam pressure, is the steam temperature, is the steam flow rate, is the number of samples in the dataset, For the dataset No. samples containing global eigenvectors, ,and ;

[0076] The pressure model is constructed using support vector machine, and the regression function of the pressure model is set as ;in, is the output of the pressure model, which is used to predict the optimal pressure value of the water supply pump. is the weight matrix, To transform the target feature vector Functions that map to high-dimensional spaces, is the bias term;

[0077] The data set is divided into a training set and a validation set. The pressure model is trained using the training set, and the training objective is defined as minimizing the structural risk function to obtain the optimal and , and use the validation set to verify the trained pressure model; the expression is as follows:

[0078]

[0079] in, is a penalty parameter used to balance the complexity of the model and the tolerance to sample errors. and is the slack variable, is an insensitive loss parameter;

[0080] Get the target feature vector in the current state in real time , use the pressure model to generate the optimal pressure value required by the water pump , and calculate the current pressure change ;in, is the current pressure value of the water supply pump;

[0081] According to the response characteristics of the water supply pump and the actual operation requirements, the time interval for setting the pressure adjustment is , and calculate the rate of pressure rise or fall , generate target pressure instructions; wherein the target pressure quality includes the optimal pressure value , actual pressure value , pressure change , time interval and rate .

[0082] Specifically, the specific steps of determining temperature anomaly include:

[0083] The normal range of the water output after the fluid passes through the boiler is preset to ;in, is the lower limit of the outlet water temperature, The upper limit of the outlet water temperature;

[0084] Use high-precision temperature sensors to obtain the actual medium temperature of the fluid after passing through the boiler in real time , judge whether the actual medium temperature exceeds the normal range of water outlet. The temperature sensor is installed near the fluid outlet after the boiler to ensure the accuracy of the measurement;

[0085] like , then it is determined that the actual medium temperature is normal, and the fluid cooling is continued according to the established cooling operation;

[0086] like , it is determined that the actual medium temperature is too high and the temperature is immediately lowered;

[0087] like , it is determined that the actual medium temperature is too low and temperature adjustment is performed to avoid waste of resources.

[0088] Specifically, the specific steps of temperature reduction regulation include:

[0089] After the fluid flows out of the boiler, it enters the cooling box. Set the flow rate of the cooling water pump to , the speed is , the function expression between flow rate and cooling effect is constructed as , and the function expression between speed and flow is ;in, is the temperature drop of the fluid at the condensation wall per unit time, 、 、 and is the correlation coefficient, which is determined by those skilled in the art;

[0090] Calculate the required increase in cooling water pump speed By increasing the speed of the cooling water pump, the cooling water flow rate is increased, the cooling effect is enhanced, and the cooling speed of the fluid is accelerated;

[0091] After cooling in the cooling box, obtain the actual cooling temperature , and set the cooling temperature threshold to , judge whether the medium temperature after passing through the cooling water tank is effectively reduced. At this time, the actual cooling temperature is collected by the temperature sensor installed near the fluid outlet after the cooling water tank;

[0092] like , the cooling effect is judged to be good, and the established stirring and cooling operation is performed;

[0093] like , the cooling effect is judged to be poor, and stirring cooling is optimized.

[0094] Specifically, the specific steps for optimizing stirring cooling include:

[0095] After the fluid flows out of the cooling box, it enters the semi-enclosed water tank. The water tank is equipped with a stirring motor to accelerate heat exchange and achieve cooling through stirring. The speed of the stirring motor is set to , the function expression between the rotation speed and the stirring effect is constructed as ;in, is the temperature drop of the fluid per unit time, is the stirring speed-temperature reduction coefficient, is a constant, determined by those skilled in the art;

[0096] Calculate the increased speed of the stirring motor The motor controller can be used to adjust the speed of the stirring motor to improve stirring efficiency and enhance cooling effect.

[0097] Specifically, the specific steps of temperature regulation include:

[0098] When the actual medium temperature is lower than the normal range of the outlet water, maintaining the original cooling operation will cause unnecessary waste of resources. Calculate the required speed reduction of the cooling water pump based on the lower limit of the outlet water temperature By reducing the speed of the cooling water pump and the cooling water flow rate, the cooling rate of the fluid is slowed down, avoiding the waste of resources caused by too low temperature.

[0099] Specifically, the feedback evaluation module is configured with a feedback strategy for evaluating the effectiveness of pressure regulation;

[0100] The specific steps of the feedback strategy include:

[0101] Get the actual medium temperature at the water inlet of the water pump , and set the stable temperature range of the water inlet medium temperature to ; Among them, the temperature stability range is the temperature range allowed for the medium temperature at the water inlet, The lower limit of water inlet temperature, indicating the lowest safe value of medium temperature at the water inlet. The upper limit of water inlet temperature, indicating the highest safe value of medium temperature at the water inlet;

[0102] After the temperature control unit starts to implement temperature regulation measures, it continuously monitors the medium temperature at the water inlet. When the temperature meets When the temperature reaches 0.05°C, a time counter is started to record the time and the temperature stability is continuously monitored. The temperature is kept stable during the period. If the temperature exceeds the stable temperature range during the period, re-adjust the temperature and monitor the temperature stability until the temperature remains within the stable temperature range for the first time. At this time, the time counter records the time interval for the temperature to return to the normal range. ;

[0103] During the temperature adjustment process, the maximum value of the water inlet medium temperature is continuously updated and recorded. With minimum value , and calculate the temperature fluctuation amplitude after the temperature adjustment is completed , which reflects the stability of temperature during the regulation process; the expression is as follows:

[0104]

[0105] Continuously record the maximum value of the water pump pressure and minimum value , and calculate the pressure fluctuation range after the temperature adjustment is completed , the expression is as follows:

[0106]

[0107] Real-time collection of flow data, which is collected by the flow meter installed on the water pump pipeline, and the flow variation coefficient is calculated , the expression is as follows:

[0108]

[0109]

[0110]

[0111] Where, is the amount of traffic data collected, For the collection of Traffic data, is the average flow rate, is the standard deviation of the calculated flow rate;

[0112] Set the time threshold for the temperature to return to the normal range to , the temperature fluctuation amplitude threshold is , the pressure fluctuation range threshold is And the flow coefficient of variation threshold is ;

[0113] Based on a series of set thresholds, a comprehensive scoring index is constructed , the expression is as follows:

[0114]

[0115] Set a comprehensive assessment threshold , judge the overall operating status according to the value of the comprehensive scoring index; if , the operation is in good condition; if , the operating conditions are not good, update the pressure model and re-regulate the pressure.

[0116] Example 2

[0117] See also Figure 5 Another embodiment provided by the present invention is a water pump pressure control method based on NB-IOT, comprising the following steps:

[0118] Utilize various high-precision monitoring devices during thermal power generation to collect multi-dimensional data on feedwater pumps and their operating environment in real time;

[0119] Process and analyze multi-dimensional data, dynamically generate and issue target pressure instructions, and synchronously and adaptively control the medium temperature;

[0120] After completing each pressure adjustment, evaluate the pressure adjustment effect.

[0121] Specifically, the steps for evaluating the effect of pressure adjustment include:

[0122] Get the actual medium temperature at the water inlet of the water pump , and set the stable temperature range of the water inlet medium temperature to ;in, is the lower limit of water inlet temperature, is the upper limit of water inlet temperature;

[0123] After the temperature control unit starts to implement temperature regulation measures, it continuously monitors the medium temperature at the water inlet. When the temperature meets When the temperature reaches 0.05°C, a time counter is started to record the time and the temperature stability is continuously monitored. The temperature is kept stable during the period. If the temperature exceeds the stable temperature range during the period, re-adjust the temperature and monitor the temperature stability until the temperature remains within the stable temperature range for the first time. At this time, the time counter records the time interval for the temperature to return to the normal range. ;

[0124] During the temperature adjustment process, the maximum value of the water inlet medium temperature is continuously updated and recorded. With minimum value , and calculate the temperature fluctuation amplitude after the temperature adjustment is completed , which reflects the stability of temperature during the regulation process; the expression is as follows:

[0125]

[0126] Continuously record the maximum value of the water pump pressure and minimum value , and calculate the pressure fluctuation range after the temperature adjustment is completed , the expression is as follows:

[0127]

[0128] Real-time collection of flow data, which is collected by the flow meter installed on the water pump pipeline, and the flow variation coefficient is calculated , the expression is as follows:

[0129]

[0130]

[0131]

[0132] Where, is the amount of traffic data collected, For the collection of Traffic data, is the average flow rate, is the standard deviation of the calculated flow rate;

[0133] Set the time threshold for the temperature to return to the normal range to , the temperature fluctuation amplitude threshold is , the pressure fluctuation range threshold is And the flow coefficient of variation threshold is ;

[0134] Based on a series of set thresholds, a comprehensive scoring index is constructed , the expression is as follows:

[0135]

[0136] Set a comprehensive assessment threshold , judge the overall operating status according to the value of the comprehensive scoring index; if , the operation is in good condition; if , the operating conditions are not good, update the pressure model and re-regulate the pressure.

[0137] In summary, the present invention collects multi-dimensional data of the water feed pump and its operating environment in a thermal power plant in real time, constructs a pressure model, calculates the optimal pressure value required by the water feed pump, ensures that the water feed pump can operate stably under various working conditions in the thermal power plant, and generates a target pressure instruction. At the same time, a temperature sensor arranged at a specific position is used to obtain the actual medium temperature in real time to determine whether it exceeds the range. If it is normal, the established cooling operation is continued. If it is too high, cooling adjustment is performed to avoid temperature damage to the water feed pump. If it is too low, heating adjustment is performed to avoid waste of resources. After the pressure adjustment is completed, a comprehensive scoring index is constructed to judge the operating status based on the comprehensive evaluation threshold. If it is not good, the pressure model is updated and readjusted.

[0138] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, various improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. The water pump pressure control system based on NB-IOT is characterized by: include: Data acquisition module, communication module, intelligent control module and feedback evaluation module; The data acquisition module is used to collect multi-dimensional data of the water supply pump and its operating environment in real time; The communication module is used to build a data transmission channel to receive and transmit data and instructions in each module in real time; The intelligent control module is used to dynamically generate target pressure instructions and synchronously and adaptively control the medium temperature; The feedback evaluation module is used to comprehensively evaluate the pressure regulation effect after the pressure regulation is completed; The intelligent control module includes a voltage control unit and a temperature control unit; The pressure control unit is used to calculate the optimal pressure value required by the water supply pump, and convert the optimal pressure value into a corresponding control signal to generate a target pressure instruction; The temperature control unit is used to monitor the temperature of the medium after passing through the boiler in real time while adjusting the pressure, and to determine temperature anomalies; The specific steps of generating the target pressure instruction include: Construct a global feature vector , and construct a data set based on several samples of the global feature vector ;in, is the optimal pressure value for the water pump, is the target feature vector, , For traffic, is the pump body temperature, is the medium temperature, is the ambient temperature, is the power generation load, is the steam pressure, is the steam temperature, is the steam flow rate, is the number of samples in the dataset, For the dataset No. samples containing the global feature vector, ; Use support vector machine to build pressure model and set the regression function of pressure model; Dividing the data set into a training set and a validation set, defining a training objective as minimizing a structural risk function, and training and validating the stress model; Obtain target feature vector in real time , using the pressure model to generate the optimal pressure value , and calculate the pressure change ;in, is the actual pressure value; Set the pressure adjustment interval to , and calculate the rate of pressure increase or decrease , generate target pressure instructions.

2. The NB-IOT-based water pump pressure control system according to claim 1 is characterized in that: The specific steps for determining temperature anomaly include: Set the normal range of water output to ;in, is the lower limit of the outlet water temperature, The upper limit of the outlet water temperature; Get the actual medium temperature in real time , judging whether the actual medium temperature exceeds the normal range of the water outlet; like , the actual medium temperature is normal, and the established cooling operation is performed; like , the actual medium temperature is too high, and a cooling adjustment is performed; like , the actual medium temperature is too low, and temperature increase regulation is performed.

3. The NB-IOT-based water pump pressure control system according to claim 2 is characterized in that: The specific steps of temperature reduction regulation include: Set the cooling water pump flow rate to , the speed is , construct the functional expressions between flow rate and cooling effect, speed and flow rate; Calculate the required increase in speed of the cooling water pump ; After cooling, get the actual cooling temperature , and set the cooling temperature threshold to , judge whether the medium temperature is effectively reduced after passing through the cooling water tank; like , the cooling effect is good, and the established stirring and cooling operation is performed; like , the cooling effect is poor, and the stirring cooling is optimized.

4. The NB-IOT-based water pump pressure control system according to claim 3 is characterized in that: Specific steps to optimize stirred cooling include: Set the stirring motor speed to , construct the functional expression between the rotation speed and the stirring effect; Calculate the increased speed of the stirring motor And adjust the speed of the stirring motor through the motor controller.

5. The NB-IOT-based water pump pressure control system according to claim 4 is characterized in that: The specific steps of temperature regulation include: According to the actual medium temperature Calculate the required speed reduction of the cooling water pump based on the lower limit of the outlet water temperature .

6. The NB-IOT-based water pump pressure control system according to claim 5 is characterized in that: The feedback evaluation module is configured with a feedback strategy for evaluating the effect of pressure regulation; The specific steps of the feedback strategy include: Get the actual medium temperature at the water inlet of the water pump , and set the stable temperature range to ;in, is the lower limit of water inlet temperature, is the upper limit of water inlet temperature; Use the time counter to obtain the time interval for the temperature to return to the stable temperature range ; Record the maximum value of the medium temperature at the water inlet With minimum value , and calculate the temperature fluctuation amplitude after the temperature adjustment is completed ; Record the maximum value of the water supply pump pressure and minimum value , and calculate the pressure fluctuation range after the temperature adjustment is completed ; Calculate the coefficient of variation of flow ;in, is the average flow rate, is the standard deviation of the calculated flow rate; Set the time threshold for the temperature to return to the normal range to , the temperature fluctuation amplitude threshold is , the pressure fluctuation range threshold is And the flow coefficient of variation threshold is , and construct a comprehensive scoring index ; Setting comprehensive assessment thresholds , judge the overall operating status according to the value of the comprehensive scoring index; if , the operation is in good condition; if , the operating conditions are not good, update the pressure model and re-regulate the pressure.

7. A water supply pump pressure control method based on NB-IOT, which is implemented based on the water supply pump pressure control system based on NB-IOT according to any one of claims 1 to 6, characterized in that: include: Real-time collection of multi-dimensional data on feedwater pumps and their operating environment during thermal power generation; Dynamically generate and issue target pressure instructions, and synchronously and adaptively control the medium temperature; After completing each pressure adjustment, evaluate the pressure adjustment effect.

8. The NB-IOT-based water pump pressure control method according to claim 7 is characterized in that: The specific steps for evaluating the effect of pressure adjustment include: Get the actual medium temperature at the water inlet of the water pump , and set the stable temperature range; Use the time counter to obtain the time interval for the temperature to return to the stable temperature range ; Calculate the temperature fluctuation amplitude after temperature regulation is completed , pressure fluctuation range and the coefficient of variation of flow ; Set the time threshold for the temperature to return to the normal range to , the temperature fluctuation amplitude threshold is , the pressure fluctuation range threshold is And the flow coefficient of variation threshold is , and construct a comprehensive scoring index ; Setting comprehensive assessment thresholds , judge the overall operating status according to the value of the comprehensive scoring index; if , the operation is in good condition; if , the operating conditions are not good, update the pressure model and re-regulate the pressure.

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