Large steam turbine valve leakproofness test method

Abstract

The invention discloses a large steam turbine valve leakproofness test method, and relates to steam turbine valve leakproofness tests. In order to solve the technical problem that in the prior art, a steam turbine valve leakproofness test method capable of reducing the starting time of a unit, saving the starting cost and improving the safety of the unit in the starting stage is urgently needed, the technical scheme provided by the invention is as follows: a large steam turbine valve leakproofness test method is provided. Comprising the steps that boiler steam pressure of a turbine corresponding to a target valve is adjusted to a preset interval; detecting the rotating speed of the steam turbine unit in the state that all the main valves are opened and the speed regulating valve is closed; when the rotating speed is smaller than a preset threshold value, a main throttle valve leakproofness test is conducted; the main valve leakproofness test specifically comprises the following steps: opening a speed regulation valve at a preset constant speed, gradually increasing to a full-open position, judging the current rotating speed of the steam turbine unit, and outputting a leakproofness qualified result if the current rotating speed is smaller than a preset threshold value. The device is suitable for the leakproofness test of the large steam turbine valve.

Description

Technical Field

[0001] The invention relates to a tightness test of a steam turbine valve, and in particular to a tightness test method of a large steam turbine valve. Background Art

[0002] In recent years, with the rapid development of the electric power industry, the implementation of the policy of promoting large and suppressing small, and the low energy consumption of large-capacity units, large-capacity units have become the main units of major power generation groups. With the implementation of the national dual carbon emission requirements and the requirements of various groups for energy conservation and consumption reduction, the energy-saving indicators of thermal power plants are getting higher and higher, and the means of energy conservation are getting fewer and fewer. In order to ensure that the units can further reduce energy consumption and reduce the startup time of the units, there is an urgent need for a turbine valve tightness test method that can reduce the startup time of the units, save startup costs, and improve the safety of the unit startup phase. Summary of the invention

[0003] In order to solve the technical problem existing in the prior art, there is an urgent need for a steam turbine valve tightness test method that can reduce the unit startup time, save startup costs, and improve the safety of the unit startup phase. The technical solution provided by the present invention is:

[0004] A large steam turbine valve tightness test method, comprising:

[0005] The step of adjusting the boiler steam pressure of the steam turbine corresponding to the target valve to a preset range;

[0006] The step of detecting the rotation speed of the steam turbine unit when all main steam valves are open and the speed regulating valves are closed;

[0007] When the rotation speed is less than a preset threshold, a step of performing a main steam valve tightness test;

[0008] The main steam valve tightness test is specifically as follows:

[0009] The speed regulating valve is opened at a preset rate at a uniform speed and gradually increased to a fully open position to determine the current speed of the steam turbine unit. If the current speed is less than a preset threshold, a result of qualified tightness is output.

[0010] Furthermore, a preferred embodiment is provided, in which the boiler steam pressure of the steam turbine corresponding to the target valve is adjusted through a bypass.

[0011] Furthermore, a preferred embodiment is provided, wherein the preset threshold is 50 r / min.

[0012] Further, a preferred embodiment is provided, wherein the preset rate is 10% / min.

[0013] Furthermore, a preferred embodiment is provided, in which the main steam valve tightness test is implemented through a DEH system.

[0014] Furthermore, a preferred embodiment is provided, in which when the steam pressure of the boiler of the steam turbine corresponding to the target valve is adjusted, the combustion state in the boiler of the steam turbine corresponding to the target valve is adjusted simultaneously.

[0015] Based on the same inventive concept, the present invention also provides a large steam turbine valve tightness test device, comprising:

[0016] A module for adjusting the boiler steam pressure of the steam turbine corresponding to the target valve to a preset range;

[0017] A module for detecting the rotation speed of the steam turbine unit when all main steam valves are open and the speed regulating valves are closed;

[0018] A module for performing a main steam valve tightness test when the rotation speed is less than a preset threshold;

[0019] The main steam valve tightness test is specifically as follows:

[0020] The speed regulating valve is opened at a preset rate at a uniform speed and gradually increased to a fully open position to determine the current speed of the steam turbine unit. If the current speed is less than a preset threshold, a result of qualified tightness is output.

[0021] Based on the same inventive concept, the present invention also provides a computer storage medium for storing a computer program. When the computer program is read by a computer, the computer executes the method described.

[0022] Based on the same inventive concept, the present invention also provides a computer, including a processor and a storage medium. When the processor reads a computer program stored in the storage medium, the computer executes the method described.

[0023] Based on the same inventive concept, the present invention also provides a computer program product, which is a computer program. When the computer program is executed, the method described above is implemented.

[0024] Compared with the prior art, the technical solution provided by the present invention is beneficial in that:

[0025] The present invention provides a large steam turbine valve tightness test method, which effectively reduces the unit startup time by advancing the valve tightness test from the traditional no-load state to the unit cranking state. This effect is due to the fact that the test is carried out in advance at a low speed, thereby avoiding frequent tests at high speeds, reducing the number of unit run-ups and boiler adjustments. Compared with the traditional no-load tightness test method, this improvement significantly shortens the startup process and reduces the overall startup time.

[0026] The invention provides a large steam turbine valve tightness test method, which optimizes the valve tightness test logic in the DEH system and deletes the original speed limit condition, so that the test can be carried out in the unit cranking state. This change reduces the unit's operating frequency at high speed, thereby reducing the need for frequent parameter adjustments of the boiler and the unit. This not only improves the efficiency of the test, but also reduces the wear and potential risks caused by high-frequency operation to the unit equipment.

[0027] The invention provides a large steam turbine valve tightness test method, which reduces the risk of excessive differential expansion and dynamic and static friction of the unit caused by frequent running, compared with the common high-speed tightness test method in existing research. This effect is due to the fact that the test is carried out at a low speed, which improves the stability of the unit during the startup phase, significantly reduces the probability of failure during the startup phase of the unit, and thus improves the overall safety.

[0028] The invention provides a large steam turbine valve tightness test method, which reduces the number of unit start-ups and boiler adjustments, thereby reducing energy consumption during the startup process. This energy-saving effect is more obvious than the traditional method, because while reducing the number of start-ups, the frequent boiler adjustment requirements are also greatly reduced, thereby achieving startup cost savings and improving overall energy efficiency.

[0029] The invention provides a large steam turbine valve tightness test method, which is suitable for use in large steam turbine valve tightness test work. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 The figure is a flow chart of a large steam turbine valve tightness test method. DETAILED DESCRIPTION

[0031] In order to make the advantages and benefits of the technical solution provided by the present invention more clearly reflected, the technical solution provided by the present invention is now further described in detail with reference to the accompanying drawings, specifically:

[0032] Embodiment 1: This embodiment provides a large steam turbine valve tightness test method, including:

[0033] The step of adjusting the boiler steam pressure of the steam turbine corresponding to the target valve to a preset range;

[0034] The step of detecting the rotation speed of the steam turbine unit when all main steam valves are open and the speed regulating valves are closed;

[0035] When the rotation speed is less than a preset threshold, a step of performing a main steam valve tightness test;

[0036] The main steam valve tightness test is specifically as follows:

[0037] The speed regulating valve is opened at a preset rate at a uniform speed and gradually increased to a fully open position to determine the current speed of the steam turbine unit. If the current speed is less than a preset threshold, a result of qualified tightness is output.

[0038] Specifically, the technical solution provided by this embodiment aims to reduce the unit startup time, save startup costs, and improve the safety of the startup phase. By optimizing the valve tightness test logic in the DEH system, this method advances the traditional no-load tightness test to the unit cranking state, thereby reducing the number of unit start-ups and boiler adjustments.

[0039] Detailed steps:

[0040] Adjust boiler combustion and steam pressure:

[0041] Overview: Before conducting a valve tightness test, adjust the boiler combustion conditions and bypass steam pressure to meet the test conditions.

[0042] Detailed description: According to the test requirements, the boiler combustion and bypass control systems are adjusted to ensure that the steam pressure reaches the appropriate range. This adjustment is to correctly simulate the required working environment in the test and provide stable conditions for subsequent valve tightness tests.

[0043] Conduct a valve tightness test:

[0044] Overview: Set up the valve tightness test logic in the DEH system and perform the valve tightness test.

[0045] Detailed description: After the unit is locked, the main steam valves will be opened and the regulating valves will remain closed. The system starts to detect the unit speed. When the speed does not reach 50r / min and remains stable, the regulating valve closing tightness is determined to be qualified. The test results at this time will serve as the prerequisite for the next main steam valve tightness test.

[0046] Select the main steam valve tightness test function:

[0047] Overview: Select the main steam valve tightness test function in the DEH system to perform the main steam valve tightness test.

[0048] Detailed description: After the system confirms that the regulating valve is tight, the operator selects the main steam valve tightness test function in the DEH system. The system will automatically close all main steam valves and slowly open the regulating valve at a rate of 10% / min, gradually increasing to the full open position. If the unit speed is stable and does not exceed 50r / min at this time, the main steam valve tightness test is qualified. This step ensures the tightness of the main steam valve and avoids additional tests at high speeds.

[0049] Reduce the number of unit start-ups and boiler adjustments:

[0050] Overview: Reduce the number of unit start-ups and boiler adjustments through optimized test methods.

[0051] Detailed description: Compared with the traditional no-load tightness test method, this method can perform valve tightness test in the cranking state, thereby reducing the need to start the unit up to 3000r / min, avoiding re-starting and frequent adjustment of boiler parameters. By reducing two unit starts and two boiler adjustments, the startup time and cost are significantly reduced.

[0052] Improved safety during the startup phase:

[0053] Overview: The optimized test method improves the safety of the unit startup phase.

[0054] Detailed description: Since the possibility of excessive expansion difference and dynamic and static friction caused by frequent unit start-up is reduced, this method can effectively reduce related risks, thereby significantly improving the safety of the unit startup phase.

[0055] Embodiment 2: This embodiment further limits the large steam turbine valve tightness test method provided in embodiment 1, and adjusts the boiler steam pressure of the steam turbine corresponding to the target valve through a bypass.

[0056] Implementation method three: This implementation method further limits the large steam turbine valve tightness test method provided in implementation method one, and the preset threshold value is 50r / min.

[0057] Embodiment 4: This embodiment further limits the large steam turbine valve tightness test method provided in embodiment 1, and the preset rate is 10% / min.

[0058] Embodiment 5: This embodiment further limits the large steam turbine valve tightness test method provided in embodiment 1, and the main steam valve tightness test is implemented through the DEH system.

[0059] Embodiment 6: This embodiment further limits the large steam turbine valve tightness test method provided in embodiment 1. When adjusting the boiler steam pressure of the steam turbine corresponding to the target valve, the combustion state in the boiler of the steam turbine corresponding to the target valve is also adjusted simultaneously.

[0060] Embodiment 7: This embodiment provides a large steam turbine valve tightness test device, including:

[0061] A module for adjusting the boiler steam pressure of the steam turbine corresponding to the target valve to a preset range;

[0062] A module for detecting the rotation speed of the steam turbine unit when all main steam valves are open and the speed regulating valves are closed;

[0063] A module for performing a main steam valve tightness test when the rotation speed is less than a preset threshold;

[0064] The main steam valve tightness test is specifically as follows:

[0065] The speed regulating valve is opened at a preset rate at a uniform speed and gradually increased to a fully open position to determine the current speed of the steam turbine unit. If the current speed is less than a preset threshold, a result of qualified tightness is output.

[0066] Embodiment 8: This embodiment provides a computer storage medium for storing a computer program. When the computer program is read by a computer, the computer executes the method provided in embodiment 1.

[0067] Embodiment 9: This embodiment provides a computer, including a processor and a storage medium. When the processor reads a computer program stored in the storage medium, the computer executes the method provided in embodiment 1.

[0068] Embodiment 10: This embodiment provides a computer program product, which is a computer program. When the computer program is executed, the method provided in embodiment 1 is implemented.

[0069] Implementation Method XI: Combination Figure 1 This embodiment is described in detail by using specific examples to further describe the technical solution provided above. Specifically:

[0070] This implementation method advances the valve tightness test from no-load to the unit cranking state. During the test, the valve tightness test requirements are met by adjusting the boiler combustion and the bypass to adjust the steam pressure. The regulating valve tightness test is first performed. The valve tightness test logic is set in the DEH. After the unit is locked, the main steam valves are opened and the regulating valves remain closed. If the unit speed does not reach 50r / min and remains stable, it is considered that the regulating valves are tightly closed and the tightness is qualified. The main steam valve tightness test function is selected in the DEH, and all main steam valves are closed. The speed regulating valve is slowly opened at a rate of 10% / min to fully open. When the regulating valve reaches full open, if the unit speed is stable and does not exceed 50r / min, the main steam valve tightness test is qualified. This valve tightness test method avoids the unit from being rushed to 3000r / min and then reduced in speed before being rushed again. It also avoids frequent adjustment of steam parameters of the boiler to cooperate with the turbine test and rush, reduces the number of unit rushes by 2 times, reduces boiler adjustments by 2 times, reduces unit startup time, saves startup costs, and improves safety during the unit startup phase.

[0071] like Figure 1 shown.

[0072] During the test, the steam pressure is adjusted by adjusting the boiler combustion and bypass to meet the valve tightness test requirements. The regulating valve tightness test is carried out first. The valve tightness test logic is set in the DEH. After the unit is shut down, the main steam valves are opened and the regulating valves remain closed. If the unit speed does not reach 50r / min and remains stable, it is considered that the regulating valves are tightly closed and the tightness is qualified. The main steam valve tightness test function is selected in the DEH, and all main steam valves are closed. The speed regulating valve is slowly opened at a rate of 10% / min to full open. When the regulating valve is fully open, if the unit speed is stable and does not exceed 50r / min, the main steam valve tightness test is qualified.

[0073] Specifically: This embodiment method is used to perform a turbine valve tightness test in the cranking state before starting a large steam turbine, so as to reduce the unit startup time, save the unit startup cost, and reduce the number of unit run-ups. It can greatly reduce the probability of excessive expansion difference and dynamic and static friction caused by frequent unit runs, thereby improving the safety of the unit startup phase.

[0074] The valve tightness test is conducted when the unit is cranked from no-load 3000r / min in advance. During the test, the valve tightness test requirements are met by adjusting the boiler combustion and the bypass to adjust the steam pressure. The regulating valve tightness test is conducted first. The valve tightness test logic is set in the DEH. After the unit is locked, the main steam valves are opened and the regulating valves remain closed. If the unit speed does not reach 50r / min and remains stable, it is considered that the regulating valves are closed tightly and the tightness is qualified. The main steam valve tightness test function is selected in the DEH, and all main steam valves are closed. The speed regulating valve is slowly opened at a rate of 10% / min to fully open. When the regulating valve reaches fully open, if the unit speed is stable and does not exceed 50r / min, the main steam valve tightness test is qualified. This valve tightness test method avoids the unit from being rushed to 3000r / min and then reduced in speed before being rushed again. It also avoids frequent adjustment of steam parameters of the boiler to cooperate with the turbine test and rush, reduces the number of unit rushes by 2 times, reduces boiler adjustments by 2 times, reduces unit startup time, saves startup costs, and improves safety during the unit startup phase.

[0075] This test method changes the traditional strictness test method, reduces the unit startup time, saves startup costs, and improves the safety of the unit startup phase.

[0076] In actual operation, the valve tightness test logic is optimized in DEH, the original speed limit condition is deleted, and the valve tightness test can be performed in the unit cranking state. First, the regulating valve tightness test is performed. By setting the valve tightness test logic in DEH, the main steam valves are opened after the unit is locked, and the regulating valves remain closed. If the unit speed does not reach 50r / min and remains stable, it is considered that the regulating valves are tightly closed and the tightness is qualified. The main steam valve tightness test function is selected in DEH, all main steam valves are closed, and the speed regulating valve is slowly opened at a rate of 10% / min to fully open. When the regulating valve reaches fully open, if the unit speed is stable and does not exceed 50r / min, the main steam valve tightness test is qualified.

[0077] The present invention focuses on: advancing the valve tightness test from no-load to the unit cranking state, reducing the number of unit rush-ups by 2 times, reducing boiler adjustments by 2 times, reducing the unit startup time, saving startup costs, and improving the safety of the unit startup stage.

[0078] The technical solution provided by the present invention is further described in detail above through several specific implementation modes in order to highlight the advantages and benefits of the technical solution provided by the present invention. However, the several specific implementation modes described above are not intended to be used as limitations on the present invention. Any reasonable modification and improvement of the present invention, combination of implementation modes and equivalent substitution within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A large steam turbine valve tightness test method, characterized in that: include: The step of adjusting the boiler steam pressure of the steam turbine corresponding to the target valve to a preset range; The step of detecting the rotation speed of the steam turbine unit when all main steam valves are open and the speed regulating valves are closed; When the rotation speed is less than a preset threshold, a step of performing a main steam valve tightness test; The main steam valve tightness test is specifically as follows: The speed regulating valve is opened at a preset rate at a uniform speed and gradually increased to a fully open position to determine the current speed of the steam turbine unit. If the current speed is less than a preset threshold, a result of qualified tightness is output.

2. A large steam turbine valve tightness test method according to claim 1, characterized in that: The boiler steam pressure of the steam turbine corresponding to the target valve is adjusted through the bypass.

3. A large steam turbine valve tightness test method according to claim 1, characterized in that: The preset threshold is 50 r / min.

4. A large steam turbine valve tightness test method according to claim 1, characterized in that: The preset rate is 10% / min.

5. A large steam turbine valve tightness test method according to claim 1, characterized in that: The main steam valve tightness test is achieved through the DEH system.

6. A large steam turbine valve tightness test method according to claim 1, characterized in that: When the steam pressure of the boiler of the steam turbine corresponding to the target valve is adjusted, the combustion state in the boiler of the steam turbine corresponding to the target valve is adjusted simultaneously.

7. A large steam turbine valve tightness test device, characterized in that: include: A module for adjusting the boiler steam pressure of the steam turbine corresponding to the target valve to a preset range; A module for detecting the rotation speed of the steam turbine unit when all main steam valves are open and the speed regulating valves are closed; A module for performing a main steam valve tightness test when the rotation speed is less than a preset threshold; The main steam valve tightness test is specifically as follows: The speed regulating valve is opened at a preset rate at a uniform speed and gradually increased to a fully open position to determine the current speed of the steam turbine unit. If the current speed is less than a preset threshold, a result of qualified tightness is output.

8. A computer storage medium for storing a computer program, characterized in that: When the computer program is read by a computer, the computer executes the method of claim 1 .

9. A computer, comprising a processor and a storage medium, characterized in that: When the processor reads the computer program stored in the storage medium, the computer executes the method of claim 1 .

10. A computer program product, being a computer program, characterized in that When the computer program is executed, the method of claim 1 is implemented.

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