A thermal power plant boiler safety regulation system

Abstract

This invention provides a safety control system for a thermal power plant boiler, effectively solving the problem that the boiler's safety can be compromised due to inaccurate measurements caused by changes in ambient temperature in the steam drum water level transmitter. The safety control system includes a data acquisition module for collecting environmental status signals from multiple sensors during boiler operation, and sending these signals, along with the steam drum water level signal detected by the transmitter, to a central controller. The central controller receives the status signals and the steam drum water level signal, obtains a status protection signal, and outputs this signal to a water level protection module. The water level protection module receives the status protection signal and performs water level protection on the boiler based on it.

Description

Technical Field

[0001] This utility model relates to the field of thermal power plant safety technology, and in particular to a thermal power plant boiler safety control system. Background Technology

[0002] As the core equipment for energy conversion, the safety of boilers in thermal power plants directly affects production efficiency, personnel safety, environmental protection, and corporate economic benefits. Boilers operate under high temperature and pressure (e.g., supercritical units at 25 MPa and 580℃). If an explosion occurs due to overpressure, overtemperature, or material failure, its destructive force is equivalent to several tons of TNT, capable of destroying plant buildings, causing fires, and resulting in serious casualties. Boiler malfunctions can also lead to plant-wide power outages, with single incidents causing losses of millions of yuan (including power generation losses, equipment repair and compensation costs). Furthermore, thermal power plants are crucial power sources for grid peak shaving; sudden outages can cause grid frequency fluctuations and even trigger cascading failures. Therefore, to ensure boiler safety, various boiler safety technologies specifically designed for thermal power plants have gradually emerged.

[0003] For example, Chinese invention patent application number 202210757680.6 provides a multifunctional boiler safety ash removal device for thermal power plants, which avoids safety problems caused by ash removal. However, there are no relevant control technologies to address the problem of inaccurate measurement or control failure due to defects in the safety design or installation of thermal power plants. For instance, changes in ambient temperature may cause the steam drum water level transmitter to become inaccurate, triggering the water level protection to fail to operate, thus compromising the safety of the boiler in the thermal power plant.

[0004] Therefore, this utility model provides a new solution to this problem. Summary of the Invention

[0005] In view of the problems existing in the prior art, the purpose of this utility model is to provide a safety control system for thermal power plant boilers. This system effectively solves the problem that the steam drum water level transmitter in thermal power plant boilers may become inaccurate when the ambient temperature changes, which in turn leads to the inability to guarantee the safety of the boilers in thermal power plants.

[0006] The technical solution is a safety control system for a thermal power plant boiler, wherein the thermal power plant boiler includes a steam drum water level transmitter, and the safety control system includes a data acquisition module, a central controller, and a water level protection module, wherein the central controller is connected to the data acquisition module and the water level protection module respectively.

[0007] The data acquisition module is used to acquire environmental status signals of the boiler drum water level transmitter based on multiple sensors during boiler operation, and send the multiple status signals and the boiler drum water level signal detected by the boiler drum water level transmitter to the central controller.

[0008] The central controller is used to receive the various status signals and the steam drum water level signal, obtain a status protection signal based on the various status signals and the steam drum water level signal, and output the status protection signal to the water level protection module.

[0009] The water level protection module is used to receive the status protection signal and perform water level protection on the boiler based on the status protection signal.

[0010] Furthermore, the central controller includes a multimodal processing module and a multimodal output module;

[0011] The multimodal processing module is used to output an actual water level signal to the multimodal output module based on the received multiple state signals and the steam drum water level signal.

[0012] The multimodal output module is used to output a status protection signal based on the actual water level signal.

[0013] Furthermore, the status signals include pressure signals, temperature signals, and flow signals.

[0014] Furthermore, the data acquisition module also includes a redundant acquisition unit, which is communicatively connected to the central controller;

[0015] The central controller is used to output a start signal to the redundant acquisition unit;

[0016] The redundant acquisition unit is used to receive the start signal and acquire the redundant environmental status signal of the steam drum water level transmitter based on the start signal.

[0017] Furthermore, the sensors in the redundant acquisition unit are of the same model as the sensors in the data acquisition module.

[0018] Furthermore, the central controller also includes a statistics unit;

[0019] The statistical unit is used to output an early warning signal based on the status protection signal.

[0020] Furthermore, the safety control system also includes a display module, which is connected to the central controller;

[0021] The display module is used to provide a high-brightness warning based on the warning signal.

[0022] This utility model achieves the following beneficial effects:

[0023] This application discloses a safety control system for a thermal power plant boiler. The boiler includes a steam drum water level transmitter. The safety control system comprises a data acquisition module, a central controller, and a water level protection module. The central controller is connected to both the data acquisition module and the water level protection module. The data acquisition module is used to acquire environmental status signals of the steam drum water level transmitter during boiler operation based on multiple sensors, and sends these multiple status signals and the steam drum water level signal detected by the transmitter to the central controller. The central controller receives the multiple status signals and the steam drum water level signal, obtains a status protection signal based on these signals, and outputs the status protection signal to the water level protection module. The water level protection module receives the status protection signal and performs water level protection on the boiler based on it. This achieves water-cooled protection for the boiler, avoiding the problem of inaccurate measurement by the steam drum water level transmitter due to changes in ambient temperature, which could lead to water level protection failure. This ensures the normal operation of the boiler in the thermal power plant. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of this utility model.

[0025] Figure 2 This is a schematic diagram of the central processing unit of this utility model.

[0026] The module consists of: 1-Data acquisition module; 2-Central controller; 3-Water level protection module; 4-Display module.

[0027] 21-Multimodal processing module; 22-Multimodal output module; 11-Redundant acquisition unit; 23-Statistical unit. Detailed Implementation

[0028] For the purposes of this utility model, the foregoing and other technical contents, features and effects are described in conjunction with the appendix below. Figure 1-2 The detailed description of the embodiments will make this clear. All structural details mentioned in the following embodiments are based on the accompanying drawings.

[0029] Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings.

[0030] A safety control system for a thermal power plant boiler, wherein the boiler of the thermal power plant includes a steam drum water level transmitter, and the safety control system includes a data acquisition module 1, a central controller 2 and a water level protection module 3, wherein the central controller 2 is connected to the data acquisition module 1 and the water level protection module 3 respectively.

[0031] The data acquisition module 1 is used to acquire environmental status signals of the boiler drum water level transmitter based on multiple sensors during boiler operation, and send the multiple status signals and the boiler drum water level signal detected by the boiler drum water level transmitter to the central controller 2.

[0032] The central controller 2 is used to receive the various status signals and the steam drum water level signal, obtain a status protection signal based on the various status signals and the steam drum water level signal, and output the status protection signal to the water level protection module 3;

[0033] The water level protection module 3 is used to receive the status protection signal and perform water level protection on the boiler based on the status protection signal.

[0034] In this embodiment, to achieve high-precision and high-reliability monitoring of the boiler drum water level, it is necessary to collect environmental state signals through the collaborative acquisition of multiple sensors. Therefore, the data acquisition module 1 is used to collect the environmental state signals of the boiler drum water level transmitter during boiler operation. The data acquisition module 1 and the central controller 2 are interconnected using HART / Modbus RTU (analog signal digitization) or Profibus-DP / EtherCAT (high-speed digital signal transmission). The data acquisition module 1 converts the environmental state of the boiler drum water level transmitter into an environmental state signal, which is the environmental state generated by the boiler during operation. The various environmental states are then filtered using a filtering algorithm to avoid the influence of noise. The data acquisition module 1 is equipped with sensors including pressure sensors, temperature sensors, and flow sensors. It can also be equipped with vibration sensors, water quality sensors, etc. The water quality sensor is installed in the water supply pipeline to monitor water quality and prevent corrosion or scaling from causing errors in the water level measurement of the steam drum water level transmitter. The vibration sensor is installed in the steam drum body to detect the mechanical vibration of the steam drum. It can provide early warning of mechanical failures of the steam drum through vibration signals, avoid measurement errors caused by equipment vibration, and thus provide early warning of crack or loosening risks.

[0035] The central controller 2 has a pre-installed core storing a pressure-temperature-water level data table. This table records the standard water level data corresponding to different pressure and temperature data. The pressure-temperature-water level data table is based on data collected during the actual operation of the boiler under normal conditions. Specifically, after the central controller 1 receives the drum water level signal, it converts the signal into water level data and iterates through the pressure-temperature-water level data table to obtain the corresponding pressure and temperature data. The pressure and temperature data are then compared with the data obtained from the conversion of various state signals to determine whether the drum water level signal detected by the corresponding drum water level transmitter is false. If a false signal is found, the actual water level data is checked. If the actual water level data reaches the water level protection threshold, the state protection signal is output to the water level protection module 3.

[0036] The water level protection module 3 receives the status protection signal, responds to the status protection signal, and performs water level protection on the boiler based on the status protection signal to prevent major accidents such as dry boiler or overfilling caused by abnormal water level. The measures that the water level protection module can perform include boiler shutdown, alarm, and water supply adjustment, and the specific protection measures are also written into the log data.

[0037] In some embodiments, the central controller 2 includes a multimodal processing module 21 and a multimodal output module 22;

[0038] The multimodal processing module 21 is used to output an actual water level signal to the multimodal output module 22 based on the received multiple state signals and the steam drum water level signal.

[0039] The multimodal output module 22 is used to output a status protection signal based on the actual water level signal.

[0040] In this embodiment, after receiving the multiple state signals and the steam drum water level signal, the central processing unit 2 activates the multimodal processing module 21 to judge the steam drum water level signal based on the multiple state signals. It then calls the pressure-temperature-water level data table to convert the steam drum water level signal into water level data. The water level data is then iterated through the pressure-temperature-water level data table to obtain the corresponding pressure and temperature data. Finally, the pressure and temperature data are compared with the data obtained from the conversion of the multiple state signals. The system determines whether the steam drum water level signal detected by the corresponding steam drum water level transmitter is false. If a false signal is found, the multi-modal processing module 21 outputs the actual water level signal to the multi-modal output module 22. The multi-modal output module 22 corrects the steam drum water level signal based on the actual water level signal to ensure that the water level data corresponding to the steam drum water level signal is consistent with the actual water level data corresponding to the actual water level signal. The system then judges the actual water level data. If the actual water level data reaches the water level protection threshold, a status protection signal is output.

[0041] In some embodiments, the status signal includes a pressure signal, a temperature signal, and a flow rate signal.

[0042] In this embodiment, the status signal includes a pressure signal, a temperature signal, and a flow signal. Correspondingly, a pressure sensor, a temperature sensor, and a flow sensor are also installed at the location where the steam drum water level transmitter is installed in the boiler. The flow signal detected by the flow sensor is used to determine whether the water level abnormality is caused by a false liquid level (such as the "false water level" phenomenon), thereby ensuring the accuracy of the judgment made by the central processing unit 2.

[0043] In some embodiments, the data acquisition module 1 further includes a redundant acquisition unit 11, which is communicatively connected to the central controller 2;

[0044] The central controller 2 is used to output a start signal to the redundant acquisition unit 11;

[0045] The redundant acquisition unit 11 is used to receive the start signal and acquire the redundant environmental status signal of the steam drum water level transmitter based on the start signal.

[0046] In this embodiment, the central controller 2 is used to output a start signal to the redundant acquisition unit 11 after failing to receive the various status signals within a preset time period. The preset time period is specifically set based on actual conditions. The redundant environmental status signal is actually consistent with the environmental status signal, but is designated as a redundant environmental status signal to distinguish it from the environmental status signal. The sensor corresponding to the acquired environmental status signal is designated as the primary sensor. All sensors in the redundant acquisition unit 11 are redundant sensors; that is, two sets of sensors are configured for each of the temperature sensor, flow sensor, and pressure sensor. When the primary sensor in the data acquisition module 1 fails, it automatically switches to the redundant sensor in the redundant acquisition unit, with a switching time ≤10 ms. A corresponding communication link is configured between the redundant sensor and the central sensor 2 for communication. A test signal of known amplitude (e.g., 1 V DC) is periodically injected to verify the gain and linearity of the communication link, with a self-test cycle ≤1 hour.

[0047] In some embodiments, the sensors in the redundant acquisition unit 11 are of the same model as the sensors in the data acquisition module 1.

[0048] In this embodiment, the sensors in the redundant acquisition unit 11 are of the same model as those in the data acquisition module. This is a key design principle to ensure data comparability. Sensors of the same model have the same range, accuracy, response time, and temperature drift characteristics, ensuring that the measurement results of the redundant acquisition unit 11 and the data acquisition module 1 can be directly compared, avoiding protection malfunctions or failures due to sensor differences. Since the main sensor and the redundant sensor are of the same model, their measured values ​​can be directly compared by difference (e.g., ΔP = |P1 - P2|). If ΔP exceeds a threshold (e.g., 0.1%FS), where P1 is the data measured by the main sensor and P2 is the data measured by the redundant sensor, then a sensor fault is determined. When one of the sensors in the redundant acquisition unit 11 and the data acquisition module 1 fails simultaneously, the fault can be quickly located as a common power supply or communication failure, rather than an individual sensor problem.

[0049] In some embodiments, the central controller 2 further includes a statistics unit 23;

[0050] The statistical unit 23 is used to output an early warning signal based on the status protection signal.

[0051] In this embodiment, after receiving the status protection signal, the statistics unit 23 counts the number of times the received status protection signal occurs within a preset time period. If the number of times within the preset time period exceeds a preset threshold, it indicates that the boiler requires water cooling protection more often and boiler maintenance is required to ensure production quality. The statistics unit 23 then outputs a warning signal.

[0052] In some embodiments, the safety control system further includes a display module 4, which is connected to the central controller 2;

[0053] The display module 4 is used to provide a high-brightness warning based on the warning signal.

[0054] In this embodiment, the display module 4 is based on an LED screen. For convenience, the LED display screen can be touch-sensitive for easy use by staff. Upon receiving the warning signal, the display module provides a high-brightness warning, employing local dimming backlighting technology. Only the LED backlight in the warning area (such as the red warning frame) is enhanced to 200% brightness, while the remaining areas maintain 50% brightness, reducing power consumption by 30%. An industrial-grade audible and visual alarm can also be integrated to alert staff to the need for boiler maintenance at the power plant, ensuring boiler production.

Claims

1. A thermal power plant boiler safety regulation system, the boiler of the thermal power plant comprising a drum water level transmitter, characterized in that, The safety control system includes a data acquisition module, a central controller, and a water level protection module. The central controller is connected to both the data acquisition module and the water level protection module. The data acquisition module includes a pressure sensor, a temperature sensor, a flow sensor, a vibration sensor, and a water quality sensor. The data acquisition module is used to acquire environmental status signals of the boiler drum water level transmitter based on multiple sensors during boiler operation, and send the multiple status signals and the boiler drum water level signal detected by the boiler drum water level transmitter to the central controller. The central controller is used to receive the various status signals and the steam drum water level signal, obtain a status protection signal based on the various status signals and the steam drum water level signal, and output the status protection signal to the water level protection module. The water level protection module is used to receive the status protection signal and perform water level protection on the boiler based on the status protection signal.

2. The thermal power plant boiler safety regulation system of claim 1, wherein, The central controller includes a multimodal processing module and a multimodal output module; The multimodal processing module is used to output an actual water level signal to the multimodal output module based on the received multiple state signals and the steam drum water level signal. The multimodal output module is used to output a status protection signal based on the actual water level signal.

3. The thermal power plant boiler safety regulation system of claim 2, wherein, The status signals include pressure signals, temperature signals, and flow signals.

4. The thermal power plant boiler safety regulation system of claim 1, wherein, The data acquisition module also includes a redundant acquisition unit, which is communicatively connected to the central controller. The central controller is used to output a start signal to the redundant acquisition unit; The redundant acquisition unit is used to receive the start signal and acquire the redundant environmental status signal of the steam drum water level transmitter based on the start signal.

5. The thermal power plant boiler safety regulation system of claim 4, wherein, The sensors in the redundant acquisition unit are of the same model as the sensors in the data acquisition module.

6. The thermal power plant boiler safety regulation system in accordance with claim 1, wherein, The central controller also includes a statistics unit; The statistical unit is used to output an early warning signal based on the status protection signal.

7. The thermal power plant boiler safety regulation system of claim 6, wherein, The safety control system also includes a display module, which is connected to the central controller; The display module is used to provide a high-brightness warning based on the warning signal.

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