Pressure maintaining experiment method and system for detecting leakage of soot blowing system

Abstract

The invention relates to a pressure maintaining experiment method and system for detecting leakage of a soot blowing system. The method comprises the following steps that S1, a soot blowing steam electric isolation door, an inlet door and a drainage door are opened; s2, the system control valve pressure is set to be a first preset pressure value, drainage operation is carried out, and a first time period is timed; s3, after timing is finished, the control valve pressure of the system is reduced to a second preset pressure value, and after a second time period is delayed, the water blowing and draining valve is closed; s4, closing the isolation door, completely closing the override of the control valve of the system, carrying out a pressure maintaining test, and timing for a third time period; s5, monitoring the pressure change in the system in real time, and determining the final pressure value of the system; s6, judging the state of the system according to the pressure change data in the system; when the final pressure value is larger than the preset pressure threshold value, the system does not leak; if the final pressure value is reduced to 0, the system breaks down. Compared with the prior art, the method has the advantages of timely detection, high reliability and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal power plant equipment detection, in particular to a pressure maintaining test method and system for detecting leakage of a soot blowing system. Background Art

[0002] In the daily operation of thermal power plants, soot blowing systems are used to remove soot deposits from the boiler's heating surfaces to maintain thermal efficiency. For power plant coal-fired boilers, the heating surfaces are critical components, and their safety and reliability are prerequisites for the unit's economical and safe operation. During operation, coking of the furnace water-cooled walls, coking of the high-temperature superheater and reheater, and soot accumulation on the rear heating surface are common and unavoidable problems, presenting challenges in the operation of coal-fired power plant boilers. This is particularly true when burning highly sticky coals, where soot and coking on the heating surfaces are the most common phenomena.

[0003] Soot accumulation on the heating surface of a boiler seriously affects heat transfer efficiency, increases exhaust gas temperature, and reduces boiler thermal efficiency. Soot accumulation also leads to high and low-temperature corrosion on the heating surface, causing frequent tube bursts and significantly shortening the boiler's operating cycle. Ensuring the cleanliness of the boiler's heating surface requires steam soot blowing, which is a crucial method for improving the boiler's economical and safe operation. However, frequent leaks from steam soot blowing can cause frequent heating surface explosions, leading to boiler shutdowns and impacting the boiler's safe and economical operation.

[0004] However, sootblower angle valve leakage or overloaded forward and backward movements are common faults. Existing management measures, such as increased post-blowing inspections to confirm the sootblower's exit position and the presence of internal and external steam leaks, can mitigate risks to a certain extent but are unable to accurately identify potential leaks in the early stages of a fault.

[0005] In summary, the existing detection technology for sootblower angle valve leakage cannot detect the fault in time at the early stage, and the detection timeliness is poor, resulting in the system operating under fault conditions for a period of time, and the sootblowing system has low reliability and safety. Summary of the Invention

[0006] The purpose of the present invention is to provide a pressure maintaining test method and system for detecting leakage of a soot blowing system in order to overcome the defects of the above-mentioned prior art, such as poor detection timeliness, which leads to low reliability and safety of the soot blowing system operation.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] This solution provides a pressure-maintaining test method for detecting sootblowing system leaks, including the following steps:

[0009] S1: Open the sootblowing steam electric isolation door, sootblowing steam electric inlet door and sootblowing steam electric drain door;

[0010] S2: Setting the sootblowing system valve pressure to a first preset pressure value, performing a drain operation, and timing a first time period;

[0011] S3: After the first timing period ends, the sootblowing system's regulating valve pressure is reduced to a second preset pressure value, and after a second delay period, the sootblowing steam electric drain valve is closed;

[0012] S4: Close the electric isolation door for sootblowing steam, completely close the system's regulating valve override, conduct a pressure holding test, and time the third time period;

[0013] S5: During the pressure holding test, the pressure changes in the soot blowing system are monitored in real time, and the final pressure value of the soot blowing system is determined;

[0014] S6: Determine the state of the sootblowing system based on the pressure change data in the sootblowing system; when the final pressure value is greater than the preset pressure threshold, the sootblowing system is not leaking; if the final pressure value drops to 0, the sootblowing system is faulty.

[0015] Furthermore, the sootblowing system valve pressure is set to a first preset pressure value in the range of 1.8-2.0 MPa.

[0016] Furthermore, the sootblowing system draining operation is maintained for a first time period greater than or equal to 600 seconds.

[0017] Furthermore, the sootblowing system valve pressure is reduced to a second preset pressure value in the range of 1.1-1.3 MPa.

[0018] Furthermore, the sootblowing system pressure maintaining test maintains a third time period greater than or equal to 600 seconds.

[0019] Furthermore, if the final pressure value of the sootblowing system is greater than 0.5 MPa, it is determined that the system has no leakage.

[0020] Furthermore, during the pressure-maintaining test of the sootblowing system, the pressure of the sootblowing system meets the requirement of a drop rate range of 0.05-0.07 MPa / min.

[0021] This solution also provides a pressure-maintaining test system for a sootblowing system, which is used to implement the above-mentioned pressure-maintaining test method for detecting leakage in a sootblowing system. The system includes:

[0022] The valve control module is configured to control the opening and closing of the sootblowing steam electric isolation door, the sootblowing steam electric inlet door and the sootblowing steam electric drain door;

[0023] A pressure regulating module is configured to: set and adjust the pressure in the sootblowing system;

[0024] The pressure detection module is configured to: monitor the pressure changes in the sootblowing system in real time and determine the final pressure value of the system;

[0025] The timing module is configured to: control the draining time of the sootblowing system and the system pressure holding time;

[0026] The main control unit is configured to connect the valve control module, the pressure regulation module, the pressure detection module and the timing module to perform the system's pressure maintenance experiment and output the experimental results.

[0027] Furthermore, the sootblowing steam electric inlet door includes the furnace left sootblowing steam electric inlet door, the furnace front sootblowing steam electric inlet door, the furnace right sootblowing steam electric inlet door, the furnace rear sootblowing steam electric inlet door, and the furnace degassing, economizer, and air preheater sootblowing steam electric inlet door.

[0028] Furthermore, the sootblowing steam electric drain door includes the furnace left sootblowing steam electric drain door, the furnace front sootblowing steam electric drain door, the furnace right sootblowing steam electric drain door, the furnace rear sootblowing steam electric drain door, and the furnace degassing, economizer, and air preheater sootblowing steam electric drain door.

[0029] Compared with the prior art, the present invention has the following advantages:

[0030] This solution opens the sootblowing system's main control valve, steam inlet valve, and drain valve, sets the system's regulating valve pressure, performs a drain operation, and then reduces the system pressure to conduct a pressure-maintaining test. The system's pressure changes can directly determine whether the system is leaking. The pressure-maintaining test can detect potential problems with the sootblowing system in the early stages of a fault, providing timely detection and preventing further equipment damage caused by angle valve leakage or failure to retract, thereby improving operational efficiency and safety. Furthermore, the pressure-maintaining test is simple and convenient to operate, with a simple overall structure that requires no additional equipment. The test duration can be flexibly adjusted, accurately identifying potential leaks in the sootblowing system and significantly improving equipment operational reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 Flow chart of the pressure maintaining experiment of the soot blowing system provided by the present invention;

[0032] Figure 2 A flow chart of specific pressure-maintaining experimental operations for the sootblowing system provided by the present invention;

[0033] Figure 3 A schematic structural diagram of the sootblowing system provided by the present invention;

[0034] Figure 4 for Figure 3 A partial enlarged view of the middle A;

[0035] Figure 5for Figure 3 A partial enlarged view of point B in the middle;

[0036] Figure 6 for Figure 3 A partial enlarged view of point C in the middle;

[0037] Figure 7 for Figure 3 A partial enlarged view of point D in the middle;

[0038] Figure 8 for Figure 3 A partial enlarged view of point E in the middle. DETAILED DESCRIPTION

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are intended to fall within the scope of protection of the present invention.

[0041] Example

[0042] like Figure 1 As shown, this embodiment provides a pressure-maintaining test method for detecting leakage in a sootblowing system, comprising the following steps:

[0043] S1: Open the sootblowing steam electric isolation door, sootblowing steam electric inlet door and sootblowing steam electric drain door;

[0044] S2: Setting the sootblowing system valve pressure to a first preset pressure value, performing a drain operation, and timing a first time period;

[0045] S3: After the first timing period ends, the sootblowing system's regulating valve pressure is reduced to a second preset pressure value, and after a second delay period, the sootblowing steam electric drain valve is closed;

[0046] S4: Close the electric isolation door for sootblowing steam, completely close the system's regulating valve override, conduct a pressure holding test, and time the third time period;

[0047] S5: During the pressure holding test, the pressure changes in the soot blowing system are monitored in real time, and the final pressure value of the soot blowing system is determined;

[0048] S6: Determine the state of the sootblowing system based on the pressure change data in the sootblowing system; when the final pressure value is greater than the preset pressure threshold, the sootblowing system is not leaking; if the final pressure value drops to 0, the sootblowing system is faulty.

[0049] In a preferred embodiment, the sootblowing system's throttle pressure is set to a first preset value within the range of 1.8-2.0 MPa. Furthermore, the sootblowing system's draining operation is maintained for a first time period of greater than or equal to 600 seconds. Setting the sootblowing system's internal pressure at the preset value, combined with an appropriate draining time, improves the accuracy and reliability of subsequent pressure-maintaining tests within the sootblowing system.

[0050] In a preferred embodiment, the sootblowing system valve pressure is reduced to a second preset pressure value in the range of 1.1-1.3 MPa. The sootblowing system pressure-maintaining test is maintained for a third time period greater than or equal to 600 seconds.

[0051] In this embodiment, if the final pressure value of the sootblowing system is greater than 0.5 MPa, it is determined that the system has no leakage. During the sootblowing system pressure maintenance test, the sootblowing system pressure meets the required drop rate range of 0.05-0.07 MPa / min.

[0052] In combination with the above preferred embodiments, this embodiment also provides a preferred specific pressure holding test method for detecting leakage in a sootblowing system, such as Figure 2 As shown, the following specific steps are included:

[0053] The operator on duty clicks the "Pressure Test" button on the control interface to start the test process;

[0054] The system automatically fully opens the electric sootblowing steam isolation door, the electric sootblowing steam inlet door on the left side of the furnace, the electric sootblowing steam inlet door in front of the furnace, the electric sootblowing steam inlet door on the right side of the furnace, the electric sootblowing steam inlet door at the rear of the furnace, the electric sootblowing steam inlet door for the furnace degassing / economizer / air preheater, and the corresponding electric sootblowing steam drain doors on the left side of the furnace, the front of the furnace, the right side of the furnace, the rear of the furnace, and the furnace degassing / economizer / air preheater;

[0055] The pressure regulating device sets the valve pressure to 1.9 MPa, and the timing device starts a 600-second drain countdown;

[0056] After the draining is completed, the pressure regulating device adjusts the valve pressure to 1.2MPa, and then closes all drain valves in sequence after a delay of 10 seconds;

[0057] Close the electric isolation door for sootblowing steam, close the regulating valve to 0% and start the timing device for a 600-second pressure holding test;

[0058] The pressure monitoring device records system pressure changes in real time.

[0059] Experimental data shows that under normal circumstances, after closing the drain valve and isolation valve, the system pressure rises to 1.5MPa, then slowly decreases at a rate of 0.05-0.07MPa / min, and after 600 seconds the pressure is approximately 0.7-1.0MPa. If there is a leak in the angle valve or the soot blower is not fully retracted, the pressure will quickly drop to 0;

[0060] If the pressure is greater than 0.5MPa at the end of the test, the control unit determines that the test is successful; if the pressure drops to 0, the steam supply is immediately restored and the inspector is notified to conduct on-site inspection.

[0061] By opening the sootblowing system's master control valve, steam inlet valve, and drain valve, setting the system's throttle pressure, performing a drain operation, and then reducing the system pressure for a pressure-maintaining test, the system's pressure changes can be used to directly determine if the system is leaking. This pressure-maintaining test can detect potential sootblowing system problems at the earliest stages of a fault, ensuring timely detection and preventing further equipment damage caused by leaking or incomplete angle valves, thereby improving operational efficiency and safety.

[0062] like Figure 3-8 As shown, this embodiment further provides a pressure-maintaining test system for a sootblowing system, which is used to implement the above-mentioned pressure-maintaining test method for detecting leakage of a sootblowing system. The system includes:

[0063] The valve control module is configured to control the opening and closing of the sootblowing steam electric isolation door, the sootblowing steam electric inlet door and the sootblowing steam electric drain door;

[0064] A pressure regulating module is configured to: set and adjust the pressure in the sootblowing system;

[0065] The pressure detection module is configured to: monitor the pressure changes in the sootblowing system in real time and determine the final pressure value of the system;

[0066] The timing module is configured to: control the draining time of the sootblowing system and the system pressure holding time;

[0067] The main control unit is configured to connect the valve control module, the pressure regulation module, the pressure detection module and the timing module to perform the system's pressure maintenance experiment and output the experimental results.

[0068] In this embodiment, the sootblowing steam electric inlet door includes the furnace left sootblowing steam electric inlet door, the furnace front sootblowing steam electric inlet door, the furnace right sootblowing steam electric inlet door, the furnace rear sootblowing steam electric inlet door, and the furnace degassing, economizer, and air preheater sootblowing steam electric inlet door.

[0069] In this embodiment, the sootblowing steam electric drain door includes the furnace left sootblowing steam electric drain door, the furnace front sootblowing steam electric drain door, the furnace right sootblowing steam electric drain door, the furnace rear sootblowing steam electric drain door, and the furnace degassing, economizer, and air preheater sootblowing steam electric drain door.

[0070] Specifically, the sootblowing system pressure-maintaining test system includes a valve control module for controlling the opening and closing of the sootblowing steam electric isolation valve and the sootblowing steam electric inlet valves and drain valves in multiple zones; a pressure regulation module for setting and adjusting system pressure; a timing module for controlling draining and pressure-maintaining time; a pressure monitoring module for real-time detection of pressure changes within the system; and a master control unit connected to the above devices to execute the pressure-maintaining test logic and output test results. This pressure-maintaining system can accurately identify potential leaks in the sootblowing system, significantly improving equipment operational reliability.

[0071] The above describes in detail the preferred embodiments of the present invention. It should be understood that those skilled in the art can make numerous modifications and variations based on the concepts of the present invention without inventive effort. Therefore, any technical solutions that can be derived by those skilled in the art through logical analysis, reasoning, or limited experimentation based on the concepts of the present invention and the prior art should be within the scope of protection defined by the claims.

Claims

1. A pressure-maintaining test method for detecting leakage in a sootblowing system, characterized in that: The following steps are involved: S1: Open the sootblowing steam electric isolation door, sootblowing steam electric inlet door and sootblowing steam electric drain door; S2: Setting the sootblowing system valve pressure to a first preset pressure value, performing a drain operation, and timing a first time period; S3: After the first timing period ends, the sootblowing system's regulating valve pressure is reduced to a second preset pressure value, and after a second delay period, the sootblowing steam electric drain valve is closed; S4: Close the electric isolation door for sootblowing steam, completely close the system's regulating valve override, conduct a pressure holding test, and time the third time period; S5: During the pressure holding test, the pressure changes in the soot blowing system are monitored in real time, and the final pressure value of the soot blowing system is determined; S6: Determine the state of the sootblowing system based on the pressure change data in the sootblowing system; when the final pressure value is greater than the preset pressure threshold, the sootblowing system is not leaking; If the final pressure value drops to 0, the sootblowing system fails.

2. A pressure maintaining test method for detecting leakage in a sootblowing system according to claim 1, characterized in that: The sootblowing system valve pressure is set to a first preset pressure value in the range of 1.8-2.0 MPa.

3. A pressure maintaining test method for detecting leakage in a sootblowing system according to claim 1, characterized in that: The sootblowing system draining operation is maintained for a first time period greater than or equal to 600 seconds.

4. A pressure maintaining test method for detecting leakage in a sootblowing system according to claim 1, characterized in that: The sootblowing system valve pressure is reduced to a second preset pressure value in the range of 1.1-1.3 MPa.

5. A pressure maintaining test method for detecting leakage in a sootblowing system according to claim 1, characterized in that: The sootblowing system pressure maintaining test maintains a third time period greater than or equal to 600 seconds.

6. A pressure maintaining test method for detecting leakage in a sootblowing system according to claim 1, characterized in that: If the final pressure value of the sootblowing system is greater than 0.5 MPa, it is determined that the system has no leakage.

7. A pressure maintaining test method for detecting leakage in a sootblowing system according to claim 1, characterized in that: During the pressure-maintaining test of the sootblowing system, the pressure of the sootblowing system meets the requirement of a drop rate range of 0.05-0.07 MPa / min.

8. A pressure-maintaining test system for a sootblowing system, used to implement a pressure-maintaining test method for detecting leakage in a sootblowing system according to any one of claims 1 to 7, characterized in that: The system comprises: The valve control module is configured to control the opening and closing of the sootblowing steam electric isolation door, the sootblowing steam electric inlet door and the sootblowing steam electric drain door; A pressure regulating module is configured to: set and adjust the pressure in the sootblowing system; The pressure detection module is configured to: monitor the pressure changes in the sootblowing system in real time and determine the final pressure value of the system; The timing module is configured to: control the draining time of the sootblowing system and the system pressure holding time; The main control unit is configured to connect the valve control module, the pressure regulation module, the pressure detection module and the timing module to perform the system's pressure maintenance experiment and output the experimental results.

9. The pressure holding test system according to claim 8, characterized in that: The sootblowing steam electric inlet door includes the furnace left sootblowing steam electric inlet door, the furnace front sootblowing steam electric inlet door, the furnace right sootblowing steam electric inlet door, the furnace rear sootblowing steam electric inlet door, and the furnace degassing, economizer, and air preheater sootblowing steam electric inlet door.

10. The pressure holding test system according to claim 8, characterized in that: The sootblowing steam electric drain door includes the furnace left sootblowing steam electric drain door, the furnace front sootblowing steam electric drain door, the furnace right sootblowing steam electric drain door, the furnace rear sootblowing steam electric drain door, and the furnace degassing, economizer, and air preheater sootblowing steam electric drain door.

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