Method for automatically modifying maintenance rate of medium-pressure control valve of 330MW steam turbine

Abstract

The invention relates to the technical field of main throttle valve hydraulic servo-motors, in particular to a method for automatically modifying the maintenance rate of a medium-pressure control valve of a 330MW steam turbine. The method comprises the following steps that initial setting is carried out, testing conditions are checked before a main throttle valve full-stroke activity test is prepared; setting the input test, namely setting the input test after confirming that test conditions are met; the maintenance rate is adjusted after a test permission button is input; a full-stroke activity test is executed, wherein the full-stroke activity test is executed after the maintenance speed is adjusted; the test quit setting is performed after the test is completed; the maintenance speed is recovered after the test permission button is withdrawn; and the monitoring and evaluation module is used for continuously monitoring the action condition of the medium-voltage control valve and the running state of the unit in the whole process and evaluating the test result after the test is completed. According to the method, the maintenance rate of the medium-pressure control valve of the 330MW steam turbine can be automatically modified.

Description

Technical Field

[0001] The present invention relates to the technical field of main steam valve oil motors, and particularly relates to a method for automatically modifying the maintenance rate of the intermediate pressure governing valve of a 330MW steam turbine. Background Art

[0002] In a thermal power generating unit, after high-temperature and high-pressure steam passes through the main steam valve and governing valve of the steam turbine, oxide scales are likely to form on the valve core and valve stem. With the accumulation of time, the oxide scales may cause valve jamming and lead to unit overspeed. As the capacity of the steam turbine generating unit increases and the grid's requirement for unit stability improves, a full-stroke test has become an important means to prevent valve jamming. However, the existing maintenance rate of the intermediate pressure governing valve is relatively small, making it difficult to cope with slight jamming and affecting safe production. Chinese Patent CN118464451A proposes a partial-stroke movement test method for the main steam valve of a steam turbine, aiming to reduce the requirements for operating conditions during the test. However, this solution still has deficiencies: after the generator is connected to the grid, the valve maintenance rate is fixed at 10% and cannot be adjusted, resulting in a long action time and small torque of the intermediate pressure governing valve during the test, making it prone to failure due to oxide scale jamming and posing a great safety hazard. Summary of the Invention

[0003] The technical problem to be solved by the present invention is: to overcome the deficiencies of the prior art and provide a method for automatically modifying the maintenance rate of the intermediate pressure governing valve of a 330MW steam turbine.

[0004] The technical solution adopted by the present invention is as follows: A method for automatically modifying the maintenance rate of the intermediate pressure governing valve of a 330MW steam turbine includes the following steps: S1. Initial setting: After the steam turbine generator is connected to the grid, set the maintenance rate of the intermediate pressure governing valve to 10% to ensure the stability and low level of the action rate of the intermediate pressure governing valve under normal operating conditions; S2. Check test conditions: Before preparing to conduct a full-stroke movement test of the main steam valve, check whether the steam turbine power is greater than 50% and whether the power control input conditions are met to ensure that the test is carried out under safe and stable conditions; S3. Input test settings: After confirming that the test conditions are met, start the test enable button for the full-stroke movement test of the main steam valve, marking the official start of the test process; S4. Adjust the maintenance rate: After the test enable button is input, modify the DCS logic to change the maintenance rate of the intermediate pressure governing valve from 10% to 30% to shorten the test time and increase the action torque, effectively removing oxide scales and preventing jamming; S5. Execute the full-stroke movement test: After adjusting the maintenance rate, execute the full-stroke movement test of the main steam valve, and the intermediate pressure governing valve acts at a higher rate and torque to achieve the purpose of removing oxide scales; S6, Exit Test Settings: The test enable button for exiting the full - stroke valve activity test of the main steam valve after the test is completed, marking the end of the test process; S7, Restore Maintenance Rate: After the test enable button is exited, the system automatically restores the maintenance rate of the intermediate - pressure control valve to 10% to ensure that the unit can return to the normal operating state after the test; S8, Monitoring and Evaluation: Used to continuously monitor the movement of the intermediate - pressure control valve and the operating state of the unit throughout the process, and evaluate the test results after the test is completed.

[0005] This technical solution realizes the automatic modification of the maintenance rate of the intermediate - pressure control valve of a 330MW steam turbine. Specifically, in step S1, the initial setting ensures that after the steam turbine - generator is synchronized, the maintenance rate of the intermediate - pressure control valve is stably set to 10% to ensure stability and safety during normal operation; in step S2, checking the test conditions makes full preparations for the subsequent test, ensuring that the test can be carried out under safe and stable conditions, and avoiding test failures or safety accidents caused by unmet conditions; in step S3, enabling the test settings marks the official start of the test process, laying a foundation for the smooth progress of the subsequent steps; immediately afterwards, in step S4, adjusting the maintenance rate is a crucial step. By modifying the DCS logic, the maintenance rate of the intermediate - pressure control valve is increased from 10% to 30% to shorten the test time and increase the operating torque, thereby more effectively removing oxide scale and preventing jamming; in step S5, performing the full - stroke valve activity test is an important link for verifying the performance of the intermediate - pressure control valve. By operating the intermediate - pressure control valve at a higher rate and torque, the purpose of removing oxide scale is achieved to ensure the normal operation of the steam turbine; after the test is completed, step S6 exits the test settings, marking the end of the test process; to restore the normal operating state of the unit, it is crucial to restore the maintenance rate in step S7. The system automatically restores the maintenance rate of the intermediate - pressure control valve to 10% to ensure that the unit can operate smoothly and safely after the test; in step S8, monitoring and evaluation ensure that the movement of the intermediate - pressure control valve and the operating state of the unit are continuously monitored throughout the process, and a comprehensive and objective evaluation of the test results is carried out after the test is completed.

[0006] In addition, the automatic modification method for the maintenance rate of the intermediate - pressure control valve of a 330MW steam turbine proposed according to the present invention further has the following additional technical features: According to an embodiment of the present invention, in the initial setting of step S1, it includes the following specific steps: S11, Confirm Synchronization Status: Check whether the steam turbine - generator has been successfully synchronized. If not synchronized, wait until synchronization is completed before proceeding to the next step; S12, Set Initial Maintenance Rate: After confirming synchronization, set the maintenance rate of the intermediate - pressure control valve to 10%, and record the set value of the current maintenance rate for subsequent verification.

[0007] Through the initial setting step of S1, this technical solution ensures the confirmation of the grid-connected state of the steam turbine generator and sets the initial maintenance rate of the medium-pressure control valve.

[0008] According to an embodiment of the present invention, in the inspection and test conditions of step S2, it includes specific steps: S21. Check the power level: Check whether the current power of the steam turbine is greater than 50%; if the power does not meet the requirements, record the error information and notify the operator. S22. Check the power control input conditions: Verify whether the power control input conditions are met, including the control system status and sensor signals; if the conditions are not met, record the error information and notify the operator.

[0009] Through the inspection and test conditions step of S2, this technical solution verifies whether the steam turbine power and power control input conditions are met, providing guarantee for the safe and stable progress of the test.

[0010] According to an embodiment of the present invention, in the input test setting of step S3, it includes specific steps: S31. Confirm that the test conditions are met: Re-confirm that all the inspection conditions in step S2 are met; if the conditions are not met, do not execute the subsequent steps. S32. Input the test setting: After confirming that the conditions are met, the operator manually or automatically inputs the test enable button for the full stroke movement test of the main steam valve; record the time when the button is input.

[0011] Through the input test setting step of S3, after confirming that the test conditions are met, this technical solution starts the test enable button for the full stroke movement test of the main steam valve, marking the official start of the test process.

[0012] According to an embodiment of the present invention, in the adjustment of the maintenance rate of step S4, it includes specific steps: S41. Modify the DCS logic: By modifying the logic of the distributed control, prepare to adjust the maintenance rate of the medium-pressure control valve; verify whether the modified logic is correct to ensure there are no errors. S42. Set the new maintenance rate: Modify the maintenance rate of the medium-pressure control valve from 10% to 30%; record the set value of the modified maintenance rate.

[0013] Through the adjustment of the maintenance rate step of S4, this technical solution modifies the DCS logic and sets the new maintenance rate to shorten the test time and increase the operating torque.

[0014] According to an embodiment of the present invention, in the execution of the full stroke movement test of step S5, it includes specific steps: S51. Start the test: After adjusting the maintenance rate, automatically or manually start the full-stroke movement test of the main steam valve; record the start time of the test. S52. Monitor the test process: Monitor the movement of the intermediate pressure control valve to ensure that it moves at a higher rate and torque; record the key parameters and data during the test.

[0015] This technical solution starts the test and monitors the movement of the intermediate pressure control valve through the steps of the full-stroke movement test in S5, ensuring that the test proceeds as expected and recording the key parameters and data.

[0016] According to an embodiment of the present invention, in the test exit setting of step S6, it includes the following specific steps: S61. Confirm the test completion: Verify whether the full-stroke movement test of the main steam valve has been completed; if the test is not completed, wait until the test is completed before proceeding to the next step. S62. Exit the test setting: Manually or automatically exit the test enable button for the full-stroke movement test of the main steam valve by the operator; record the time when the button is exited.

[0017] This technical solution exits the test enable button after the test is completed through the steps of the test exit setting in S6, marking the end of the test process.

[0018] According to an embodiment of the present invention, in the restoration of the maintenance rate in step S7, it includes the following specific steps: S71. Verify the end of the test: Reconfirm that the test in step S6 has indeed ended; if the test has not ended, do not execute the subsequent steps. S72. Restore the initial maintenance rate: Automatically restore the maintenance rate of the intermediate pressure control valve to 10%; record the restored maintenance rate setting value.

[0019] This technical solution verifies the end of the test and restores the initial maintenance rate of the intermediate pressure control valve through the steps of restoring the maintenance rate in S7, ensuring that the unit can return to the normal operating state.

[0020] According to an embodiment of the present invention, in the monitoring and evaluation of step S8, it includes the following specific steps: S81. Continuously monitor: Continuously monitor the movement of the intermediate pressure control valve and the operating state of the unit throughout the process; record any abnormal situations or errors. S82. Evaluate the test results: After the test is completed, evaluate the test results.

[0021] This technical solution continuously monitors the movement of the intermediate pressure control valve and the operating state of the unit throughout the process and evaluates the test results after the test is completed through the steps of monitoring and evaluation in S8.

[0022] Compared with the prior art, the present invention has the following beneficial effects: (1) Through automated step settings, from initial settings to checking test conditions, to inputting test settings and adjusting the maintenance rate, each step ensures that the test is carried out under safe and stable conditions; in the stage of adjusting the maintenance rate, by modifying the DCS logic, the maintenance rate of the medium-pressure throttle valve is increased, which not only shortens the test time, but also increases the operating torque, effectively removes oxide scale, prevents jamming, and thus improves the test efficiency and the safety of unit operation.

[0023] (2) After the test is completed, it can automatically restore the initial maintenance rate of the medium-pressure throttle valve, and by continuously monitoring the operation of the medium-pressure throttle valve and the operating status of the unit, it ensures that the unit can operate smoothly and safely after the test, guaranteeing the long-term stable operation of the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is the flow principle block diagram of the present invention.

[0025] Figure 2 is the structural schematic diagram of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0027] Embodiment 1 As Figure 1 and Figure 2 shown, this embodiment provides an automatic modification method for the maintenance rate of the medium-pressure throttle valve of a 330MW steam turbine, including the following steps: S1. Initial setting: After the steam turbine generator is connected to the grid, the maintenance rate of the medium-pressure throttle valve is set to 10% to ensure the stability and low level of the action rate of the medium-pressure throttle valve under normal operating conditions; S2. Checking test conditions: Before preparing for the full-stroke movement test of the main steam valve, check whether the steam turbine power is greater than 50% and whether the power control input conditions are met to ensure that the test is carried out under safe and stable conditions; S3. Inputting test settings: After confirming that the test conditions are met, start the test permission button for the full-stroke movement test of the main steam valve, marking the official start of the test process; S4. Adjust the maintenance rate: After the test enable button is activated, modify the DCS logic to change the medium-pressure governor valve maintenance rate from 10% to 30% to shorten the test time, increase the operating torque, effectively remove the oxide scale, and prevent jamming. S5. Perform the full-stroke movement test: After adjusting the maintenance rate, perform the full-stroke movement test of the main steam valve. The medium-pressure governor valve operates at a higher rate and torque to achieve the purpose of removing the oxide scale. S6. Exit the test setup: After the test is completed, deactivate the test enable button for the full-stroke movement test of the main steam valve, marking the end of the test process. S7. Restore the maintenance rate: After the test enable button is deactivated, the system automatically restores the medium-pressure governor valve maintenance rate to 10% to ensure that the unit can return to the normal operating state after the test. S8. Monitor and evaluate: Continuously monitor the operation of the medium-pressure governor valve and the unit operating status throughout the process, and evaluate the test results after the test is completed.

[0028] As Figure 1 and Figure 2 shown, this technical solution realizes the automatic modification of the medium-pressure governor valve maintenance rate of the 330MW steam turbine. Specifically, in step S1, the initial setting ensures that after the steam turbine generator is synchronized to the grid, the maintenance rate of the medium-pressure governor valve is stably set to 10% to ensure the stability and safety during normal operation; in step S2, checking the test conditions makes full preparations for the subsequent test, ensuring that the test can be carried out under safe and stable conditions, and avoiding test failures or safety accidents caused by unmet conditions; in step S3, activating the test setup marks the official start of the test process and lays the foundation for the smooth progress of the subsequent steps; immediately, in step S4, adjusting the maintenance rate is a crucial step. By modifying the DCS logic, the maintenance rate of the medium-pressure governor valve is increased from 10% to 30% to shorten the test time and increase the operating torque, thereby more effectively removing the oxide scale and preventing jamming; in step S5, performing the full-stroke movement test is an important part of verifying the performance of the medium-pressure governor valve. By operating the medium-pressure governor valve at a higher rate and torque, the purpose of removing the oxide scale is achieved to ensure the normal operation of the steam turbine; after the test is completed, step S6 exits the test setup, marking the end of the test process; to restore the normal operating state of the unit, it is crucial to restore the maintenance rate in step S7. The system automatically restores the maintenance rate of the medium-pressure governor valve to 10% to ensure that the unit can operate smoothly and safely after the test; in step S8, monitoring and evaluation ensure that the operation of the medium-pressure governor valve and the unit operating status are continuously monitored throughout the process, and a comprehensive and objective evaluation of the test results is carried out after the test is completed.

[0029] In addition, the automatic modification method for the maintenance rate of the intermediate pressure governing valve of the 330MW steam turbine proposed above according to the present invention further has the following additional technical features: According to an embodiment of the present invention, in the initial setting of step S1, it includes the following specific steps: S11. Confirm the grid-connected state: Check whether the steam turbine generator has been successfully grid-connected. If it is not grid-connected, wait until the grid connection is completed before proceeding to the next step; S12. Set the initial maintenance rate: After confirming the grid connection, set the maintenance rate of the intermediate pressure governing valve to 10%, and record the set value of the current maintenance rate for subsequent verification.

[0030] Through the initial setting steps of S1 in this technical solution, it ensures the confirmation of the grid-connected state of the steam turbine generator and sets the initial maintenance rate of the intermediate pressure governing valve.

[0031] According to an embodiment of the present invention, in the inspection and test conditions of step S2, it includes the following specific steps: S21. Check the power level: Check whether the current power of the steam turbine is greater than 50%; if the power does not meet the requirements, record the error information and notify the operator; S22. Check the power control input conditions: Verify whether the power control input conditions are met, including the control system status and sensor signals; if the conditions are not met, record the error information and notify the operator.

[0032] Through the inspection and test conditions steps of S2 in this technical solution, it verifies whether the steam turbine power and power control input conditions are met, providing guarantee for the safe and stable conduct of the test.

[0033] According to an embodiment of the present invention, in the input test setting of step S3, it includes the following specific steps: S31. Confirm that the test conditions are met: Re-confirm that all the inspection conditions in step S2 are met; if the conditions are not met, do not execute the subsequent steps; S32. Input the test setting: After confirming that the conditions are met, the operator manually or automatically inputs the test enable button for the full stroke movement test of the main steam valve; record the time when the button is input.

[0034] Through the input test setting steps of S3 in this technical solution, after confirming that the test conditions are met, it starts the test enable button for the full stroke movement test of the main steam valve, marking the official start of the test process.

[0035] According to an embodiment of the present invention, in the adjustment of the maintenance rate in step S4, it includes the following specific steps: S41. Modify the DCS logic: By modifying the logic of the distributed control, prepare to adjust the maintenance rate of the intermediate pressure governing valve; verify whether the modified logic is correct to ensure there are no errors; S42. Set a new maintenance rate: Modify the maintenance rate of the medium-pressure control valve from 10% to 30%; Record the set value of the modified maintenance rate.

[0036] This technical solution modifies the DCS logic and sets a new maintenance rate through the step of adjusting the maintenance rate in S4 to shorten the test time and increase the operating torque.

[0037] According to an embodiment of the present invention, during the execution of the full-stroke movement test in step S5, the following specific steps are included: S51. Start the test: After adjusting the maintenance rate, automatically or manually start the full-stroke movement test of the main steam valve; Record the start time of the test. S52. Monitor the test process: Monitor the movement of the medium-pressure control valve to ensure that it moves at a higher rate and torque; Record the key parameters and data during the test.

[0038] This technical solution starts the test and monitors the movement of the medium-pressure control valve through the step of executing the full-stroke movement test in S5 to ensure that the test proceeds as expected and records the key parameters and data.

[0039] According to an embodiment of the present invention, during the test exit setting in step S6, the following specific steps are included: S61. Confirm the completion of the test: Verify whether the full-stroke movement test of the main steam valve has been completed; If the test is not completed, wait until the test is completed before proceeding to the next step. S62. Exit the test setting: Manually or automatically exit the test enable button for the full-stroke movement test of the main steam valve by the operator; Record the exit time of the button.

[0040] This technical solution exits the test enable button after the test is completed through the step of exiting the test setting in S6, marking the end of the test process.

[0041] According to an embodiment of the present invention, during the restoration of the maintenance rate in step S7, the following specific steps are included: S71. Verify the end of the test: Confirm again that the test in step S6 has indeed ended; If the test has not ended, do not execute the subsequent steps. S72. Restore the initial maintenance rate: Automatically restore the maintenance rate of the medium-pressure control valve to 10%; Record the set value of the restored maintenance rate.

[0042] This technical solution verifies the end of the test and restores the initial maintenance rate of the medium-pressure control valve through the step of restoring the maintenance rate in S7 to ensure that the unit can return to the normal operating state.

[0043] According to an embodiment of the present invention, during the monitoring and evaluation in step S8, the following specific steps are included: S81. Continuous monitoring: During the whole process, continuously monitor the operation of the medium-pressure governing valve and the operating status of the unit; record any abnormal conditions or errors; S82. Evaluate the test results: After the test is completed, evaluate the test results.

[0044] Through the monitoring and evaluation steps of S8, this technical solution continuously monitors the operation of the medium-pressure governing valve and the operating status of the unit during the whole process, and evaluates the test results after the test is completed.

[0045] Although the present invention has been described in detail by referring to the accompanying drawings and in combination with the preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, those of ordinary skill in the art make various equivalent modifications or substitutions to the embodiments of the present invention, and these modifications or substitutions should all be within the scope of the present invention. / Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. An automatic modification method for the maintenance rate of the medium-pressure governing valve of a 330MW steam turbine, characterized in that, It includes the following steps: S1. Initial setting: After the steam turbine generator is synchronized, set the maintenance rate of the intermediate pressure control valve to 10% to ensure the stability and low level of the action rate of the intermediate pressure control valve under normal operating conditions; S2. Check test conditions: Before preparing for the full stroke movement test of the main steam valve, check whether the steam turbine power is greater than 50% and whether the power control input conditions are met to ensure that the test is carried out under safe and stable conditions; S3. Input test setting: After confirming that the test conditions are met, start the test enable button for the full stroke movement test of the main steam valve, marking the official start of the test process; S4. Adjust the maintenance rate: After the test enable button is input, modify the DCS logic to change the maintenance rate of the intermediate pressure control valve from 10% to 30% to shorten the test time and increase the action torque, effectively remove the oxide scale, and prevent jamming; S5. Execute the full stroke movement test: After adjusting the maintenance rate, execute the full stroke movement test of the main steam valve, and the intermediate pressure control valve moves at a higher rate and torque to achieve the purpose of removing the oxide scale; S6. Exit the test setting: After the test is completed, exit the test enable button for the full stroke movement test of the main steam valve, marking the end of the test process; S7. Restore the maintenance rate: After the test enable button is exited, the system automatically restores the maintenance rate of the intermediate pressure control valve to 10% to ensure that the unit can return to the normal operating state after the test; S8. Monitoring and evaluation: Continuously monitor the action of the intermediate pressure control valve and the operating state of the unit throughout the process, and evaluate the test results after the test is completed.

2. The automatic modification method for the maintenance rate of the medium pressure governing valve of the 330MW steam turbine according to claim 1, wherein In the initial setting of step S1, it includes the following specific steps: S11. Confirm the synchronization status: Check whether the steam turbine generator has been successfully synchronized. If not synchronized, wait until synchronization is completed before proceeding to the next step; S12. Set the initial maintenance rate: After confirming synchronization, set the maintenance rate of the intermediate pressure control valve to 10%, and record the set value of the current maintenance rate for subsequent verification.

3. The automatic modification method for the maintenance rate of the medium pressure governing valve of the 330MW steam turbine according to claim 1, characterized in that, In the check test conditions of step S2, it includes the following specific steps: S21. Check the power level: Check whether the current power of the steam turbine is greater than 50%; if the power does not meet the requirements, record the error information and notify the operator; S22. Check the power control input conditions: Verify whether the power control input conditions are met, including the control system status and sensor signals; If the conditions are not met, record the error information and notify the operator.

4. The automatic modification method for the maintenance rate of the medium-pressure governing valve of a 330MW steam turbine according to claim 1, wherein In the input test setting of step S3, it includes the following specific steps: S31. Confirm that the test conditions are met: Reconfirm that all the check conditions in step S2 are met; if the conditions are not met, do not execute the subsequent steps; S32. Input the test setting: After confirming that the conditions are met, manually or automatically input the test enable button for the full stroke movement test of the main steam valve by the operator; record the time when the button is input.

5. The automatic modification method for the maintenance rate of the medium pressure governing valve of a 330MW steam turbine as claimed in claim 1, characterized in that, In the adjust the maintenance rate of step S4, it includes the following specific steps: S41. Modify the DCS logic: Prepare to adjust the maintenance rate of the intermediate pressure control valve by modifying the logic of the distributed control; verify whether the modified logic is correct to ensure there are no errors; S42. Set a new maintenance rate: Modify the maintenance rate of the intermediate pressure control valve from 10% to 30%; Record the set value of the modified maintenance rate.

6. The automatic modification method for the maintenance rate of the medium-pressure governing valve of a 330MW steam turbine as described in claim 1, characterized in that, In the full-stroke activity test performed in step S5, the specific steps include: S51. Start the test: After adjusting the maintenance rate, automatically or manually start the full-stroke activity test of the main steam valve; Record the start time of the test. S52. Monitor the test process: Monitor the movement of the intermediate pressure control valve to ensure that it moves at a higher rate and torque; Record the key parameters and data during the test.

7. The automatic modification method for the maintenance rate of the medium-pressure governing valve of a 330MW steam turbine according to claim 1, wherein In the test setup for exiting step S6, the specific steps include: S61. Confirm the completion of the test: Verify whether the full-stroke activity test of the main steam valve has been completed; If the test is not completed, wait until the test is completed before proceeding to the next step. S62. Exit the test setup: Manually or automatically by the operator exit the test enable button for the full-stroke activity test of the main steam valve; Record the time when the button is exited.

8. The automatic modification method for the maintenance rate of the medium-pressure governing valve of a 330MW steam turbine according to claim 1, characterized in that, In the restoration of the maintenance rate in step S7, the specific steps include: S71. Verify the end of the test: Reconfirm that the test in step S6 has indeed ended; If the test is not ended, do not perform the subsequent steps. S72. Restore the initial maintenance rate: Automatically restore the maintenance rate of the intermediate pressure control valve to 10%; Record the set value of the restored maintenance rate.

9. The method for automatically modifying the maintenance rate of the intermediate pressure governing valve of a 330MW steam turbine according to claim 1, characterized in that In the monitoring and evaluation in step S8, the specific steps include: S81. Continuously monitor: Throughout the process, continuously monitor the movement of the intermediate pressure control valve and the operating status of the unit; Record any abnormal conditions or errors. S82. Evaluate the test results: After the test is completed, evaluate the test results.

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