Boiler maintenance system

Abstract

The invention relates to a boiler maintenance system which comprises a liquid level control device, a pressure control device and a controller, the liquid level control device and the pressure control device are connected with the controller, and the liquid level control device and the pressure control device are both used for being connected with a steam pocket in a boiler; the liquid level control device is used for obtaining the liquid level height in the steam pocket; the pressure control device is used for acquiring the pressure in the steam pocket; the controller is used for controlling the liquid level control device to supplement liquid to the steam pocket according to the liquid level height obtained by the liquid level control device and controlling the pressure control device to supplement air to the steam pocket according to the pressure obtained by the pressure control device.

Description

Technical Field

[0001] The present disclosure relates to the technical field of boiler maintenance, and in particular, to a boiler maintenance system. Background Art

[0002] Gas boiler is one of the important equipments in thermal power plant. It is used to provide auxiliary steam for the units when the whole thermal power plant is started in full cold state. It is used for steam for main engine and small unit shaft seals, steam for heating the heater of boiler primary air system, steam for heating deaerator, etc.

[0003] During the shutdown period of gas boilers, specific maintenance measures need to be implemented to ensure their safety and extend their service life. At present, most power plants need to rely on manual operation to frequently start pumps to maintain high water levels after the boiler is shut down to prevent excessive temperature differences between the upper and lower walls of the drum. In addition, general boilers have three drums: high, medium, and low pressure. When the drum pressure drops to 0.2 MPa, nitrogen filling dry maintenance is required. However, manual operation has the risk of untimely operation or errors, which may cause damage to the boiler or poor maintenance results. Summary of the invention

[0004] In order to solve the above problems, the present disclosure provides a boiler maintenance system.

[0005] According to a first aspect of an embodiment of the present disclosure, there is provided a boiler maintenance system, the system comprising a liquid level control device, a pressure control device and a controller, wherein the liquid level control device and the pressure control device are respectively connected to the controller, and the liquid level control device and the pressure control device are both used to connect to a steam drum in a boiler; The liquid level control device is used to obtain the liquid level height in the drum; The pressure control device is used to obtain the pressure in the steam drum; The controller is used to control the liquid level control device to replenish liquid to the steam drum according to the liquid level height obtained by the liquid level control device, and to control the pressure control device to replenish air to the steam drum according to the pressure obtained by the pressure control device.

[0006] Optionally, the controller includes a comparison circuit and a control circuit; the comparison circuit includes a first comparison circuit and a second comparison circuit, and the control circuit includes a first control circuit and a second control circuit; Wherein, the first comparison circuit and the first control circuit are both connected to the liquid level control device, and the second comparison circuit and the second control circuit are both connected to the pressure control device; The first comparison circuit is used to compare the liquid level height with a preset liquid level threshold to generate a first comparison result; The second comparison circuit is used to compare the pressure with a preset pressure threshold to generate a second comparison result; The first control circuit is used to control the liquid level control device to replenish the steam drum with liquid according to the first comparison result; The second control circuit is used to control the pressure control device to replenish air to the steam drum according to the second comparison result.

[0007] Optionally, the liquid level control device comprises a liquid level sensor and a liquid replenishing device, the liquid level sensor and the liquid replenishing device are both connected to the controller, and the liquid level sensor and the liquid replenishing device are both connected to the steam drum; The liquid level sensor is used to obtain the liquid level height in the steam drum; The liquid replenishing device is used to replenish liquid to the steam drum.

[0008] Optionally, the liquid replenishing device includes a control valve connected to the electric pump; the control valve is connected to the controller, and the control valve is connected to the steam drum; The electric pump is used to start according to the first comparison result to replenish liquid to the steam drum; The control valve is used to open according to the first comparison result, so that the electric pump replenishes liquid to the steam drum through the control valve.

[0009] Optionally, the preset liquid level threshold includes a first preset liquid level threshold and a second preset liquid level threshold; The first comparison circuit is used to generate the first comparison result when the liquid level is greater than or equal to the first preset liquid level threshold; or When the liquid level height is less than the second preset liquid level threshold, the first comparison result is generated.

[0010] Optionally, the pressure control device comprises a pressure sensor and a nitrogen charging device, the pressure sensor and the nitrogen charging device are both connected to the controller, and the pressure sensor and the nitrogen charging device are both connected to the steam drum; The pressure sensor is used to detect the pressure in the steam drum; The nitrogen charging device is used to replenish air to the steam drum.

[0011] Optionally, the nitrogen charging device includes a nitrogen generator and a nitrogen charging valve, and the nitrogen generator is connected to the steam drum via the nitrogen charging valve. The nitrogen generator is configured to be started according to the second comparison result; The nitrogen charging valve is used to open according to the second comparison result, so that the nitrogen generator can supply gas to the steam drum through the nitrogen charging valve.

[0012] Optionally, the preset pressure threshold includes a first preset pressure threshold and a second preset pressure threshold; The second comparison circuit is used to generate the second comparison result when the pressure is greater than or equal to the first preset pressure threshold; or When the pressure is less than the second preset pressure threshold, the second comparison result is generated.

[0013] Optionally, the system further comprises an alarm device, wherein the alarm device is connected to the control device; The controller is further configured to generate a first alarm signal according to the liquid level height to trigger the alarm device to output a first alarm message, and to generate a second alarm signal according to the pressure to trigger the alarm device to output a second alarm message.

[0014] Optionally, the first control circuit is further configured to generate the first alarm signal according to the first comparison result, so as to trigger the alarm device to output the first alarm information; The second control circuit is further used to generate the second alarm signal according to the second comparison result to trigger the alarm device to output second alarm information.

[0015] The technical solution provided by the embodiments of the present disclosure may have the following beneficial effects: The present disclosure provides a boiler maintenance system, the system includes a liquid level control device, a pressure control device and a controller, wherein the liquid level control device and the pressure control device are respectively connected to the controller, and the liquid level control device and the pressure control device are both used to connect to the drum in the boiler; the liquid level control device is used to obtain the liquid level height in the drum; the pressure control device is used to obtain the pressure in the drum; the controller is used to control the liquid level control device to replenish the drum with liquid according to the liquid level height obtained by the liquid level control device, and to control the pressure control device to replenish the drum with air according to the pressure obtained by the pressure control device. In this way, the liquid level and pressure of the drum can be monitored in real time by the liquid level control device and the pressure control device provided with high-precision sensors, and the corresponding liquid level control device and pressure control device can be controlled by the controller according to the obtained liquid level height and pressure to replenish liquid and replenish air to maintain the boiler, and the boiler maintenance process can be fully automated by introducing advanced sensors and control logic, thereby improving the safety and service life of the boiler.

[0016] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings: Figure 1 It is a structural schematic diagram of a boiler maintenance system according to an exemplary embodiment.

[0018] Figure 2 It is a structural schematic diagram of another boiler maintenance system according to an exemplary embodiment.

[0019] Figure 3 It is a structural schematic diagram of another boiler maintenance system according to an exemplary embodiment.

[0020] Figure 4 It is a structural schematic diagram of another boiler maintenance system according to an exemplary embodiment.

[0021] Figure 5 It is a structural schematic diagram of another boiler maintenance system according to an exemplary embodiment.

[0022] Figure 6 It is a structural schematic diagram of another boiler maintenance system according to an exemplary embodiment. DETAILED DESCRIPTION

[0023] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0024] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0025] The embodiments described in some embodiments of the present disclosure below do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0026] Before introducing the specific implementation methods of the present disclosure in detail, the application scenarios of the present disclosure are first described. The present disclosure can be applied to the maintenance scenario of the boiler. At present, the gas boiler is one of the important equipment required for thermal power plants. It is used to provide auxiliary steam for the units when the thermal power plant is fully cold-started. It is used for the main engine and small machine shaft seal steam, boiler primary air system heater heating steam, deaerator heating steam, etc. During the shutdown period of the gas boiler, in order to ensure its safety and extend its service life, specific maintenance measures need to be implemented.

[0027] In the relevant technology, most power plants need to rely on manual operation to frequently start pumps to maintain a high water level after the boiler is shut down to prevent excessive temperature difference between the upper and lower walls of the drum. In addition, a general boiler has three drums: high, medium, and low pressure. When the drum pressure drops to 0.2 MPa, nitrogen filling dry maintenance is required. However, manual operation has the risk of untimely operation or mistakes, which may cause damage to the boiler or poor maintenance results.

[0028] In order to overcome the technical problems existing in the above related technologies, the present disclosure provides a boiler maintenance system. The system includes a liquid level control device, a pressure control device and a controller, wherein the liquid level control device and the pressure control device are respectively connected to the controller, and the liquid level control device and the pressure control device are both used to connect to the drum in the boiler; the liquid level control device is used to obtain the liquid level height in the drum; the pressure control device is used to obtain the pressure in the drum; the controller is used to control the liquid level control device to replenish the drum with liquid according to the liquid level height obtained by the liquid level control device, and to control the pressure control device to replenish the drum with air according to the pressure obtained by the pressure control device. In this way, the liquid level and pressure of the drum can be monitored in real time by the liquid level control device and the pressure control device provided with high-precision sensors, and the corresponding liquid level control device and the pressure control device can be controlled by the controller according to the obtained liquid level height and pressure to replenish liquid and air, so as to maintain the boiler. By introducing advanced sensors and control logic, the boiler maintenance process can be fully automated, thereby improving the safety and service life of the boiler.

[0029] The present disclosure is described below in conjunction with specific embodiments.

[0030] Figure 1 is a structural schematic diagram of a boiler maintenance system according to an exemplary embodiment. Figure 1 As shown, the system 100 includes a liquid level control device 101, a pressure control device 102 and a controller 103. The liquid level control device 101 and the pressure control device 102 are respectively connected to the controller 103, and the liquid level control device 101 and the pressure control device 102 are both used to connect to the steam drum in the boiler.

[0031] The liquid level control device 101 is used to obtain the liquid level height in the drum.

[0032] Optionally, the liquid level control device 101 may include a liquid level sensor, which is connected to the controller 103 .

[0033] The liquid level sensor may be a high-precision magnetostrictive water level gauge or an ultrasonic level gauge for real-time monitoring of the liquid level of the drum, and the liquid level sensor and the controller 103 may be connected by wire, thus ensuring the accuracy and real-time performance of data transmission.

[0034] The pressure control device 102 is used to obtain the pressure in the steam drum.

[0035] Optionally, the pressure control device 102 may include a pressure sensor, which is connected to the controller 103 .

[0036] The pressure sensor can be a high-precision pressure transmitter, which can be used to monitor the pressure of the steam drum in real time. The sensor is connected to the control system by wire to ensure the accuracy and real-time performance of data transmission.

[0037] The controller 103 is used to control the liquid level control device 101 to replenish the steam drum with liquid according to the liquid level height obtained by the liquid level control device 101, and to control the pressure control device 102 to replenish the steam drum with air according to the pressure obtained by the pressure control device 102.

[0038] The boiler maintenance system provided above includes a liquid level control device 101, a pressure control device 102 and a controller 103, wherein the liquid level control device 101 and the pressure control device 102 are respectively connected to the controller 103, and the liquid level control device 101 and the pressure control device 102 are both used to connect to the steam drum in the boiler; the liquid level control device 101 is used to obtain the liquid level height in the steam drum; the pressure control device 102 is used to obtain the pressure in the steam drum; the controller 103 is used to control the liquid level control device 101 to replenish liquid to the steam drum according to the liquid level height obtained by the liquid level control device 101, and to control the pressure control device 102 to replenish air to the steam drum according to the pressure obtained by the pressure control device 102. In this way, the liquid level and pressure of the drum can be monitored in real time by means of the liquid level control device 101 and the pressure control device 102 equipped with high-precision sensors, and the corresponding liquid level control device 101 and the pressure control device 102 can be controlled by the controller 103 according to the acquired liquid level height and pressure to replenish liquid and air for boiler maintenance. By introducing advanced sensors and control logic, the boiler maintenance process can be fully automated, thereby improving the safety and service life of the boiler.

[0039] In some embodiments, Figure 2 As shown, the controller 103 includes a comparison circuit and a control circuit; the comparison circuit includes a first comparison circuit 1031 and a second comparison circuit 1032, and the control circuit includes a first control circuit 1033 and a second control circuit 1034. The first comparison circuit 1031 and the first control circuit 1033 are both connected to the liquid level control device 101, and the second comparison circuit 1032 and the second control circuit 1034 are both connected to the pressure control device 102.

[0040] The first comparison circuit 1031 is used to compare the liquid level height with a preset liquid level threshold to generate a first comparison result.

[0041] The preset liquid level threshold includes a first preset liquid level threshold and a second preset liquid level threshold.

[0042] For example, the first comparison circuit 1031 is used to generate the first comparison result when the liquid level height is greater than or equal to the first preset liquid level threshold; or to generate the first comparison result when the liquid level height is less than the second preset liquid level threshold.

[0043] The second comparison circuit 1032 is used to compare the pressure with a preset pressure threshold to generate a second comparison result.

[0044] The preset pressure threshold includes a first preset pressure threshold and a second preset pressure threshold.

[0045] For example, the second comparison circuit 1032 is used to generate the second comparison result when the pressure is greater than or equal to the first preset pressure threshold; or to generate the second comparison result when the pressure is less than the second preset pressure threshold.

[0046] The first control circuit 1033 is used to control the liquid level control device 101 to replenish the steam drum with liquid according to the first comparison result.

[0047] The second control circuit 1034 is used to control the pressure control device 102 to replenish air to the steam drum according to the second comparison result.

[0048] By adopting the above technical solution, the first comparison circuit 1031 can be used to determine whether the liquid level in the drum is higher than the preset liquid level threshold, generate a first comparison result, and when the first comparison result indicates that the liquid level is greater than or equal to the preset liquid level threshold, control the liquid level control device 101 to replenish the drum with liquid. And the second comparison circuit 1032 can be used to determine whether the pressure in the drum is higher than the preset pressure threshold, generate a second comparison result, and when the second comparison result indicates that the pressure is greater than or equal to the preset pressure threshold, control the pressure control device 102 to replenish the drum with gas.

[0049] In some embodiments, Figure 3 As shown, the liquid level control device 101 includes a liquid level sensor 1011 and a liquid replenishing device 1012, and the liquid level sensor 1011 and the liquid replenishing device 1012 are both connected to the controller 103, and the liquid level sensor 1011 and the liquid replenishing device 1012 are both connected to the steam drum.

[0050] Optionally, the liquid level sensor 1011 is used to obtain the liquid level height in the steam drum; the liquid replenishing device 1012 is used to replenish liquid to the steam drum.

[0051] The liquid replenishing device 1012 includes a control valve connected to the electric pump; the control valve is connected to the controller 103, and the control valve is connected to the steam drum.

[0052] Optionally, the electric pump is used to start according to the first comparison result to replenish liquid to the steam drum; the control valve is used to open according to the first comparison result so that the electric pump replenishes liquid to the steam drum through the control valve.

[0053] Among them, the liquid level sensor 1011 can use a high-precision magnetostrictive water level gauge or an ultrasonic liquid level gauge to monitor the liquid level of the steam drum in real time, and the liquid level sensor 1011 and the controller 103 can be connected in a wired manner, which can ensure the accuracy and real-time performance of data transmission.

[0054] For example, when the liquid level sensor 1011 detects that the liquid level is lower than the set value, the controller 103 can send an instruction to the liquid replenishing device 1012. When receiving the instruction, the liquid replenishing device 1012 can start the electric pump according to the instruction and open the control valve, so that the electric pump replenishes water into the steam drum through the control valve. During the water replenishment process, the liquid level sensor 1011 will detect the liquid level height of the steam drum in real time, and send the detected liquid level height to the controller 103 in real time. When the controller 103 determines that the liquid level has reached the set high water level, it sends an automatic pump stop sequence control instruction to the electric pump.

[0055] In some embodiments, Figure 4As shown, the pressure control device 102 includes a pressure sensor 1021 and a nitrogen charging device. The pressure sensor 1021 and the nitrogen charging device 1022 are both connected to the controller 103, and the pressure sensor 1021 and the nitrogen charging device 1022 are both connected to the steam drum.

[0056] Optionally, the pressure sensor 1021 is used to detect the pressure in the steam drum; the nitrogen filling device 1022 is used to replenish air to the steam drum.

[0057] The nitrogen charging device 1022 includes a nitrogen generator and a nitrogen charging valve, and the nitrogen generator is connected to the steam drum via the nitrogen charging valve.

[0058] Optionally, the nitrogen generator is used to start according to the second comparison result; the nitrogen filling valve is used to open according to the second comparison result, so that the nitrogen generator supplies gas to the steam drum through the nitrogen filling valve.

[0059] The pressure sensor 1021 can be a high-precision pressure transmitter to monitor the pressure of the steam drum in real time. The sensor is connected to the control system by wire to ensure the accuracy and real-time performance of data transmission.

[0060] For example, when the pressure sensor 1021 detects that the drum pressure drops to 0.2 MPa, the controller 103 can send an instruction to the nitrogen generator to start the nitrogen generator and fill nitrogen into the drum through the nitrogen filling valve for dry maintenance. During the nitrogen filling process, the pressure sensor 1021 will detect the drum pressure in real time, and when the controller 103 determines that the pressure reaches the set value, the automatic nitrogen filling device 1022 is closed.

[0061] In some embodiments, Figure 5 As shown, the system further includes an alarm device 104, which is connected to the control device.

[0062] Optionally, the controller 103 is further configured to generate a first alarm signal according to the liquid level height to trigger the alarm device 104 to output a first alarm message, and to generate a second alarm signal according to the pressure to trigger the alarm device 104 to output a second alarm message.

[0063] By way of example, the first control circuit 1033 is further used to generate the first alarm signal according to the first comparison result to trigger the alarm device 104 to output the first alarm information; the second control circuit 1034 is further used to generate the second alarm signal according to the second comparison result to trigger the alarm device 104 to output the second alarm information.

[0064] In some embodiments, Figure 6As shown, a liquid level control device 101, a pressure control device 102 and a controller 103, wherein the liquid level control device 101 and the pressure control device 102 are connected to the controller 103 respectively, and the liquid level control device 101 and the pressure control device 102 are both used to connect to the steam drum in the boiler.

[0065] The liquid level control device 101 includes a liquid level sensor 1011 and a liquid replenishing device 1012. The liquid level sensor 1011 and the liquid replenishing device 1012 are both connected to the controller 103, and the liquid level sensor 1011 and the liquid replenishing device 1012 are both connected to the steam drum.

[0066] The pressure control device 102 includes a pressure sensor 1021 and a nitrogen charging device 1022. The pressure sensor 1021 and the nitrogen charging device 1022 are both connected to the controller 103, and the pressure sensor 1021 and the nitrogen charging device 1022 are both connected to the steam drum.

[0067] The liquid replenishing device 1012 includes a control valve connected to the electric pump; the control valve is connected to the controller 103, and the control valve is connected to the steam drum.

[0068] The nitrogen charging device 1022 includes a nitrogen generator and a nitrogen charging valve, and the nitrogen generator is connected to the steam drum through the nitrogen charging valve.

[0069] The controller 103 includes a comparison circuit and a control circuit; the comparison circuit includes a first comparison circuit 1031 and a second comparison circuit 1032, and the control circuit includes a first control circuit 1033 and a second control circuit 1034; wherein the first comparison circuit 1031 and the first control circuit 1033 are both connected to the liquid level control device 101, and the second comparison circuit 1032 and the second control circuit 1034 are both connected to the pressure control device 102.

[0070] When the system is used for boiler maintenance, after the boiler is shut down, the liquid level sensor 1011 can be used to monitor the liquid level of the steam drum in real time, and the liquid level can be sent to the first comparison circuit 1031 of the connected controller 103. The first comparison circuit 1031 includes two input terminals, one input terminal is used to input the liquid level, and the other input terminal is used to input a preset liquid level threshold. The first comparison circuit 1031 can generate a first comparison result based on the liquid level and the preset liquid level threshold, and then the first control circuit 1033 generates a first control signal through the first comparison result, which is used to control the opening of the control valve and the start-up of the electric pump, so that the electric pump replenishes liquid to the steam drum through the control valve.

[0071] The pressure sensor 1021 can be used to monitor the pressure of the steam drum in real time, and send the pressure to the second comparison circuit 1032 of the connected controller 103. The second comparison circuit 1032 includes two input ends, one input end is used to input the pressure, and the other input end is used to input a preset pressure threshold. The second comparison circuit 1032 can generate a second comparison result according to the pressure and the preset pressure threshold, and then the second control circuit 1034 generates a second control signal through the second comparison result, which is used to control the opening of the nitrogen filling valve and the start-up of the nitrogen generator, so that the nitrogen generator can replenish gas to the steam drum through the nitrogen filling valve.

[0072] Specifically, when the liquid level is lower than the set value, the pump start sequence control signal can be automatically sent to start, and water can be added to the drum to the set high water level to prevent the temperature difference between the upper and lower walls of the drum from being too large. When the drum pressure drops to 0.6Mpa, the pump start signal is locked, and when the drum pressure drops to 0.2Mpa, the automatic nitrogen filling device 1022 is started to fill nitrogen into the drum for dry maintenance to prevent corrosion and oxidation inside the boiler. In this way, during the whole process, the controller 103 is responsible for coordinating the work of various components to ensure the smooth progress of the maintenance process.

[0073] By adopting the above system, the liquid level and pressure of the drum can be monitored in real time through the liquid level control device 101 and the pressure control device 102 equipped with high-precision sensors, and the corresponding liquid level control device 101 and the pressure control device 102 can be controlled by the controller 103 according to the acquired liquid level height and pressure to replenish liquid and air for boiler maintenance. By introducing advanced sensors and control logic, the boiler maintenance process can be fully automated, thereby improving the safety and service life of the boiler.

[0074] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0075] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0076] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A boiler maintenance system, characterized in that: The system comprises a liquid level control device, a pressure control device and a controller, wherein the liquid level control device and the pressure control device are respectively connected to the controller, and the liquid level control device and the pressure control device are both used to connect to the steam drum in the boiler; The liquid level control device is used to obtain the liquid level height in the drum; The pressure control device is used to obtain the pressure in the steam drum; The controller is used to control the liquid level control device to replenish liquid to the steam drum according to the liquid level height obtained by the liquid level control device, and to control the pressure control device to replenish air to the steam drum according to the pressure obtained by the pressure control device.

2. The boiler maintenance system according to claim 1, characterized in that: The controller includes a comparison circuit and a control circuit; the comparison circuit includes a first comparison circuit and a second comparison circuit, and the control circuit includes a first control circuit and a second control circuit; Wherein, the first comparison circuit and the first control circuit are both connected to the liquid level control device, and the second comparison circuit and the second control circuit are both connected to the pressure control device; The first comparison circuit is used to compare the liquid level height with a preset liquid level threshold to generate a first comparison result; The second comparison circuit is used to compare the pressure with a preset pressure threshold to generate a second comparison result; The first control circuit is used to control the liquid level control device to replenish the steam drum with liquid according to the first comparison result; The second control circuit is used to control the pressure control device to replenish air to the steam drum according to the second comparison result.

3. The boiler maintenance system according to claim 2, characterized in that: The liquid level control device comprises a liquid level sensor and a liquid replenishing device, wherein the liquid level sensor and the liquid replenishing device are both connected to the controller, and the liquid level sensor and the liquid replenishing device are both connected to the steam drum; The liquid level sensor is used to obtain the liquid level height in the steam drum; The liquid replenishing device is used to replenish liquid to the steam drum.

4. The boiler maintenance system according to claim 3, characterized in that: The liquid replenishing device includes a control valve connected to the electric pump; the control valve is connected to the controller, and the control valve is connected to the steam drum; The electric pump is used to start according to the first comparison result to replenish liquid to the steam drum; The control valve is used to open according to the first comparison result, so that the electric pump replenishes liquid to the steam drum through the control valve.

5. The boiler maintenance system according to claim 3, characterized in that: The preset liquid level threshold comprises a first preset liquid level threshold and a second preset liquid level threshold; The first comparison circuit is used to generate the first comparison result when the liquid level is greater than or equal to the first preset liquid level threshold; or When the liquid level height is less than the second preset liquid level threshold, the first comparison result is generated.

6. The boiler maintenance system according to claim 2, characterized in that: The pressure control device comprises a pressure sensor and a nitrogen charging device, wherein the pressure sensor and the nitrogen charging device are both connected to the controller, and the pressure sensor and the nitrogen charging device are both connected to the steam drum; The pressure sensor is used to detect the pressure in the steam drum; The nitrogen charging device is used to replenish air to the steam drum.

7. The boiler maintenance system according to claim 6, characterized in that: The nitrogen charging device comprises a nitrogen generator and a nitrogen charging valve, wherein the nitrogen generator is connected to the steam drum via the nitrogen charging valve. The nitrogen generator is configured to be started according to the second comparison result; The nitrogen charging valve is used to open according to the second comparison result, so that the nitrogen generator can supply gas to the steam drum through the nitrogen charging valve.

8. The boiler maintenance system according to claim 6, characterized in that: The preset pressure threshold comprises a first preset pressure threshold and a second preset pressure threshold; The second comparison circuit is used to generate the second comparison result when the pressure is greater than or equal to the first preset pressure threshold; or, When the pressure is less than the second preset pressure threshold, the second comparison result is generated.

9. The boiler maintenance system according to any one of claims 2 to 8, characterized in that: The system further comprises an alarm device, wherein the alarm device is connected to the control device; The controller is further configured to generate a first alarm signal according to the liquid level height to trigger the alarm device to output a first alarm message, and to generate a second alarm signal according to the pressure to trigger the alarm device to output a second alarm message.

10. The boiler maintenance system according to claim 9, characterized in that: The first control circuit is further used to generate the first alarm signal according to the first comparison result to trigger the alarm device to output the first alarm information; The second control circuit is further used to generate the second alarm signal according to the second comparison result to trigger the alarm device to output second alarm information.

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