CN110748386A - Method for online processing leakage point of steam turbine pipeline - Google Patents
Method for online processing leakage point of steam turbine pipeline Download PDFInfo
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- CN110748386A CN110748386A CN201911059110.4A CN201911059110A CN110748386A CN 110748386 A CN110748386 A CN 110748386A CN 201911059110 A CN201911059110 A CN 201911059110A CN 110748386 A CN110748386 A CN 110748386A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
- F01D21/003—Arrangements for testing or measuring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
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- General Engineering & Computer Science (AREA)
- Control Of Turbines (AREA)
Abstract
The invention provides a method for processing a steam turbine pipeline leakage point on line, which improves the safety of personnel and equipment and the economy of a power plant and comprises the feasibility verification of single-side steam inlet of a steam turbine intermediate pressure cylinder; the unit control load is 400MW to 480 MW; contacting thermal control personnel and steam turbine maintenance personnel in place; the unit control mode is switched to a BASE mode; exiting the CCS control of the steam turbine and putting into pressure control; the boiler side is adjusted to be well combusted; clicking a single-side RSV valve activity test on a CRT, wherein a program closes a single-side ICV firstly, then closes the single-side RSV, and after an ICV signal and an RSV signal are switched off, thermal control personnel forcibly suspend the test, keeps the RSV and the ICV in a fully-closed state, confirms that the running parameters of a unit are stable, and otherwise, immediately restores the normal running mode; after confirming that RSV and ICV are closed on site, splitting leakage points of the EH oil pipeline of the middle connecting door on the side, and performing defect elimination treatment after confirming that the pipeline has no pressure; and after the leakage point is eliminated, the thermal control personnel removes the test pause, confirms that the unit operation parameters are stable, confirms that the valve moves normally, and eliminates the leakage point of the EH oil system.
Description
Technical Field
The invention belongs to the technical field of leakage prevention of a steam turbine, and particularly relates to a method for online processing of a pipeline leakage point of the steam turbine.
Background
The EH oil system is used as an important auxiliary system of the steam turbine and is related to the safe and stable operation of the steam turbine. Because the working oil pressure is high, and the influence of the operation adjustment of the unit is continuously received, the pipeline is easy to vibrate and crack, the joints and other parts leak oil, and accidents such as oil level reduction, oil pressure reduction, unit tripping and the like of the EH oil system are caused. The leakage accidents of the EH oil system are generally processed by adopting an online leakage blocking method or a shutdown processing method, so that the safety of personnel and equipment and the economy of a power plant are greatly influenced.
Disclosure of Invention
The invention provides a method for online processing the leakage point of a turbine pipeline, which improves the safety of personnel and equipment and the economy of a power plant.
The technical scheme of the invention is as follows: a method for on-line treatment of a turbine pipeline leak point, comprising the steps of:
1. verifying the feasibility of single-side steam admission of a steam turbine intermediate pressure cylinder;
2. the unit control load is 400MW to 480 MW;
3. contacting thermal control personnel and steam turbine maintenance personnel in place;
4. the unit control mode is switched to a BASE mode;
5. exiting the CCS control of the steam turbine and putting into pressure control;
6. the boiler side is adjusted to be well combusted, and the steam temperature and the pressure are controlled to be stable by the total coal amount and the desuperheating water;
clicking a single-side RSV valve activity test on a CRT, wherein a program closes a single-side ICV firstly, then closes the single-side RSV, and after an ICV signal and an RSV signal are closed, thermal control personnel forcibly suspend the test, keeps the RSV and the ICV in a fully closed state, confirms that the unit operation parameters are stable, and otherwise, immediately restores the normal operation mode;
8. after confirming that RSV and ICV are closed on site, splitting leakage points of the EH oil pipeline of the middle connecting door on the side, and performing defect elimination treatment after confirming that the pipeline has no pressure;
9. and after the leakage point is eliminated, the thermal control personnel removes the test pause, the program firstly starts the single-side RSV and then starts the single-side ICV, the stability of the unit operation parameters is confirmed, the normal valve activity is confirmed, and the leakage point of the EH oil system is eliminated.
Further, the step of verifying the steam admission possibility of the single side of the intermediate pressure cylinder of the steam turbine in the step 1 comprises equipment structure analysis and equipment working condition analysis.
Further, the device structure analysis comprises:
analyzing the structure of a middle-pressure joint steam valve, wherein the middle-pressure joint steam valve consists of a middle-pressure main steam valve and a middle-pressure regulating steam valve, the middle-pressure joint steam valve is of a vertical structure, the upper part of the middle-pressure regulating steam valve is the middle-pressure regulating steam valve, the lower part of the middle-pressure main steam valve is the middle-pressure main steam valve, the middle-pressure regulating steam valve and the middle-pressure main steam valve share the same shell, the same cavity and the same valve seat, valve butterflies of the middle-pressure regulating steam valve and the middle-pressure main steam valve are arranged in series up and down, the two valves are respectively provided with an executing mechanism, and an; the other servomotor and the spring operating seat positioned at the lower part of the middle linkage valve control the opening and closing of the main steam valve, the two middle-pressure combined steam valves are arranged at two sides of the middle-pressure cylinder, steam from the reheating section enters an inlet of each valve and sequentially passes through the middle-pressure regulating steam valve and the middle-pressure main steam valve and enters the middle-pressure cylinder through a middle-pressure steam guide pipe;
the structure analysis of the medium-pressure main steam valve comprises a valve rod, a valve butterfly, a valve seat (shared by a medium-pressure regulating valve), a valve shell (shared by the medium-pressure regulating valve), a valve rod sleeve, a steam distribution lever, an actuating mechanism and the like, wherein the medium-pressure main steam valve is a single-seat valve, the valve butterfly of the medium-pressure main steam valve is inverted and is positioned in a valve core of the medium-pressure regulating steam valve, the up-and-down movement of the valve butterfly is not limited by a regulating valve bell-type structure, an inner side inclined plane of the valve is in contact with an outer side inclined plane of the valve rod sleeve to prevent the main steam valve from vibrating in the operation, the valve core is connected with a servomotor arranged below the valve rod through the valve core, the servomotor is a single-side oil-inlet servomotor and is in a fully-open state during normal operation and can not be regulated when the valve is closed and can be rapidly closed only when the machine is shut down or in an accident, the safety of a machine set is, the medium-pressure main steam valve rod leaks steam and is connected to a main machine shaft seal steam return pipe;
the structure analysis of medium pressure speed regulating valve, the medium pressure regulating valve is composed of valve rod, valve rod sleeve, valve butterfly, valve seat (shared with medium pressure main valve), valve shell (shared with medium pressure main valve), actuating mechanism, etc., the valve core adopts bell-jar type structure, it mainly bears peripheral radial force, and adds a pre-opening valve, and can reduce lifting force required when the valve is opened, and it can contain valve core of medium pressure main valve, and can make overall structure compact, and can ensure opening or closing of medium pressure regulating valve, and is not influenced by opening and closing state of medium pressure main valve, the valve disk is connected with driving lever by means of valve rod, one end of driving lever is hinged, and another end is controlled by oil-operated machine, when the piston of single side oil-intake oil-operated machine is moved up and down, the valve is driven by driving lever to act, when the medium pressure regulating valve is started, the medium pressure cylinder is in full-opening position after it is started, the steam turbine can be quickly closed when the load of the steam turbine is relieved, and the overspeed of the steam turbine is prevented.
The scheme is further that the equipment working condition analysis comprises the steps of controlling the unit load to be between 400MW and 480MW, adjusting unit parameters to be stable, closing the one-side ICV firstly by a test program, then closing the one-side RSV, and after confirming that the action is flexible, opening the RSV and then opening the ICV sequentially by the program, finishing the one-side middle linkage door activity test, wherein the middle valve activity test is about 2min, and the main parameters of the unit are stable during the steam admission period of the one-side middle pressure cylinder.
The invention has the advantages that: according to the invention, through analyzing the operation condition of the steam turbine intermediate pressure cylinder single-side steam inlet mode operation scheme is studied and formulated, and through closing the steam turbine single-side intermediate connection door, a method for online processing of the steam turbine pipeline leakage point is carried out, thereby avoiding unit shutdown and personnel online leakage stoppage processing, and improving the safety of personnel and equipment and the economy of a power plant.
Detailed Description
The present invention will be described more fully hereinafter so that those skilled in the art can fully practice the invention without the need for creative efforts.
A method for on-line treatment of a turbine pipeline leak point, comprising the steps of:
1. the feasibility of steam turbine intermediate pressure cylinder unilateral admission is verified, and steam turbine intermediate pressure cylinder unilateral admission possibility is verified the step and is included equipment structure analysis and equipment operating mode analysis, equipment structure analysis includes: analyzing the structure of a middle-pressure joint steam valve, wherein the middle-pressure joint steam valve consists of a middle-pressure main steam valve and a middle-pressure regulating steam valve, the middle-pressure joint steam valve is of a vertical structure, the upper part of the middle-pressure regulating steam valve is the middle-pressure regulating steam valve, the lower part of the middle-pressure main steam valve is the middle-pressure main steam valve, the middle-pressure regulating steam valve and the middle-pressure main steam valve share the same shell, the same cavity and the same valve seat, valve butterflies of the middle-pressure regulating steam valve and the middle-pressure main steam valve are arranged in series up and down, the two valves are respectively provided with an executing mechanism, and an; the other servomotor and the spring operating seat positioned at the lower part of the middle linkage valve control the opening and closing of the main steam valve, the two middle-pressure combined steam valves are arranged at two sides of the middle-pressure cylinder, steam from the reheating section enters an inlet of each valve and sequentially passes through the middle-pressure regulating steam valve and the middle-pressure main steam valve and enters the middle-pressure cylinder through a middle-pressure steam guide pipe; the structure analysis of the medium-pressure main steam valve comprises a valve rod, a valve butterfly, a valve seat (shared by a medium-pressure regulating valve), a valve shell (shared by the medium-pressure regulating valve), a valve rod sleeve, a steam distribution lever, an actuating mechanism and the like, wherein the medium-pressure main steam valve is a single-seat valve, the valve butterfly of the medium-pressure main steam valve is inverted and is positioned in a valve core of the medium-pressure regulating steam valve, the up-and-down movement of the valve butterfly is not limited by a regulating valve bell-type structure, an inner side inclined plane of the valve is in contact with an outer side inclined plane of the valve rod sleeve to prevent the main steam valve from vibrating in the operation, the valve core is connected with a servomotor arranged below the valve rod through the valve core, the servomotor is a single-side oil-inlet servomotor and is in a fully-open state during normal operation and can not be regulated when the valve is closed and can be rapidly closed only when the machine is shut down or in an accident, the safety of a machine set is, the medium-pressure main steam valve rod leaks steam and is connected to a main machine shaft seal steam return pipe; the structure analysis of medium pressure speed regulating valve, the medium pressure regulating valve is composed of valve rod, valve rod sleeve, valve butterfly, valve seat (shared with medium pressure main valve), valve shell (shared with medium pressure main valve), actuating mechanism, etc., the valve core adopts bell-jar type structure, it mainly bears peripheral radial force, and adds a pre-opening valve, and can reduce lifting force required when the valve is opened, and it can contain valve core of medium pressure main valve, and can make overall structure compact, and can ensure opening or closing of medium pressure regulating valve, and is not influenced by opening and closing state of medium pressure main valve, the valve disk is connected with driving lever by means of valve rod, one end of driving lever is hinged, and another end is controlled by oil-operated machine, when the piston of single side oil-intake oil-operated machine is moved up and down, the valve is driven by driving lever to act, when the medium pressure regulating valve is started, the medium pressure cylinder is in full-opening position after it is started, the method comprises the steps that when a steam turbine is subjected to load shedding, the steam turbine can be quickly closed to prevent the steam turbine from overspeed, the analysis of the working condition of the equipment comprises the steps of controlling the load of the unit between 400MW and 480MW, adjusting the parameters of the unit to be stable, firstly closing a single-side ICV by a test program, then closing a single-side RSV, and after confirming that the action is flexible, sequentially opening the RSV and then opening the ICV by the program, finishing a single-side middle linkage valve activity test, wherein the valve activity test is about 2min in the period, and the main parameters of the unit are;
2. the unit control load is 400MW to 480 MW;
3. contacting thermal control personnel and steam turbine maintenance personnel in place;
4. the unit control mode is switched to a BASE mode;
5. exiting the CCS control of the steam turbine and putting into pressure control;
6. the boiler side is adjusted to be well combusted, and the steam temperature and the pressure are controlled to be stable by the total coal amount and the desuperheating water;
click single sided RSV valve activity test on CRT. The program closes the single-side ICV firstly, then closes the single-side RSV, and after the signals of the ICV and the RSV are closed, the thermal control personnel forcibly suspends the test, keeps the RSV and the ICV in the full-closed state, confirms that the unit operation parameters are stable, and otherwise immediately resumes the normal operation mode;
8. after confirming that RSV and ICV are closed on site, splitting leakage points of the EH oil pipeline of the middle connecting door on the side, and performing defect elimination treatment after confirming that the pipeline has no pressure;
9. and after the leakage point is eliminated, the thermal control personnel removes the test pause, the program firstly starts the single-side RSV and then starts the single-side ICV, the stability of the unit operation parameters is confirmed, the normal valve activity is confirmed, and the leakage point of the EH oil system is eliminated.
A specific embodiment of the present invention is: in 2019, 7, 30 days of Dazhanbinggeneration Limited company No. 2 unit in the left side middle joint oil supply filter screen leaks in operation, the scheme is adopted to successfully process the defect, the unit operates stably in the period, and the non-stop accident is avoided, and the specific process is as follows: 7, 30 months, 18:50 days and 560MW of unit load, and operators find that the rear joint of the left middle joint oil supply filter screen of the No. 2 unit leaks in the operation. And immediately reporting and connecting with the on-site study scheme of the maintainers to carry out preparation work before defect elimination. 7 months, 30 days, 21:40, the unit releases AGC to reduce the load to 423MW, the temperature of the main steam is 550 ℃, the pressure of the main steam is 19.32MPa, the temperature of the reheated steam is 559 ℃, and the pressure of the reheated steam is 3.11 MPa. And (4) contacting thermal control personnel and steam turbine maintenance personnel in place, preparing to close the left middle connection door, and separating the EH oil leakage area for treatment. 22:49:33, unit load 410MW, main steam temperature 557 ℃, main steam pressure 19.73 MPa, reheat steam temperature 564 ℃, reheat steam pressure 3.14 MPa, ICV1 full close, unit operation condition is stable, and host TSI parameters have no obvious change. The method comprises the steps of 22:49:43, unit load 413MW, main steam temperature 550 ℃, main steam pressure 19.32MPa, reheat steam temperature 559 ℃, reheat steam pressure 3.1MPa and RSV1 all-closed, a thermal control personnel compulsorily suspends a middle linkage activity test, the ICV1 and the RSV1 are kept in the all-closed state, the operating personnel observes that unit operation parameters are stable, safety measures are arranged, a front manual door, a rear manual door and a bypass door of an EH oil supply filter screen of the middle pressure main valve from EH oil to No. 1 are closed, and an EH oil system leakage area is isolated. In the processing process, the unit operation parameters are stable, and the TSI parameters of the host have no obvious change. 23:31:43 unit load 423MW, main steam temperature 557 ℃, main steam pressure 19.9 MPa, reheat steam temperature 564 ℃, reheat steam pressure 3.11MPa, and when the leak point treatment is finished, the operator starts to recover the left middle-connected door. 33:40 unit load 434MW, main steam temperature 556 ℃, main steam pressure 19.9 MPa, reheat steam temperature 564 ℃, reheat steam pressure 3.1MPa, and RSV1 full open. The load of a unit of 33:40 is 434MW, the temperature of main steam is 556 ℃, the pressure of the main steam is 19.9 MPa, the temperature of reheat steam is 564 ℃, the pressure of reheat steam is 3.1MPa, ICV1 is fully opened, a left middle joint gate recovers normal operation, the operation parameters of the unit are checked to be stable during the period, and the abnormal phenomenon does not occur.
While the preferred embodiments of the invention have been described, it is to be understood that the invention is not limited to the precise embodiments described, and that equipment and structures not described in detail are understood to be practiced as commonly known in the art; any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention by those skilled in the art can be made without departing from the technical scope of the present invention, and still fall within the protection scope of the technical solution of the present invention.
Claims (4)
1. A method for on-line treatment of a turbine pipeline leak point, comprising the steps of:
1. verifying the feasibility of single-side steam admission of a steam turbine intermediate pressure cylinder;
2. the unit control load is 400MW to 480 MW;
3. contacting thermal control personnel and steam turbine maintenance personnel in place;
4. the unit control mode is switched to a BASE mode;
5. exiting the CCS control of the steam turbine and putting into pressure control;
6. the boiler side is adjusted to be well combusted, and the steam temperature and the pressure are controlled to be stable by the total coal amount and the desuperheating water;
clicking a single-side RSV valve activity test on a CRT, wherein a program closes a single-side ICV firstly, then closes the single-side RSV, and after an ICV signal and an RSV signal are closed, thermal control personnel forcibly suspend the test, keeps the RSV and the ICV in a fully closed state, confirms that the unit operation parameters are stable, and otherwise, immediately restores the normal operation mode;
8. after confirming that RSV and ICV are closed on site, splitting leakage points of the EH oil pipeline of the middle connecting door on the side, and performing defect elimination treatment after confirming that the pipeline has no pressure;
9. and after the leakage point is eliminated, the thermal control personnel removes the test pause, the program firstly starts the single-side RSV and then starts the single-side ICV, the stability of the unit operation parameters is confirmed, the normal valve activity is confirmed, and the leakage point of the EH oil system is eliminated.
2. The method for on-line processing the pipeline leakage point of the steam turbine according to claim 1, wherein the step of verifying the single-side steam admission possibility of the intermediate pressure cylinder of the steam turbine in the step 1 comprises equipment structure analysis and equipment working condition analysis.
3. The method of claim 2 wherein said plant structural analysis comprises:
analyzing the structure of a middle-pressure joint steam valve, wherein the middle-pressure joint steam valve consists of a middle-pressure main steam valve and a middle-pressure regulating steam valve, the middle-pressure joint steam valve is of a vertical structure, the upper part of the middle-pressure regulating steam valve is the middle-pressure regulating steam valve, the lower part of the middle-pressure main steam valve is the middle-pressure main steam valve, the middle-pressure regulating steam valve and the middle-pressure main steam valve share the same shell, the same cavity and the same valve seat, valve butterflies of the middle-pressure regulating steam valve and the middle-pressure main steam valve are arranged in series up and down, the two valves are respectively provided with an executing mechanism, and an; the other servomotor and the spring operating seat positioned at the lower part of the middle linkage valve control the opening and closing of the main steam valve, the two middle-pressure combined steam valves are arranged at two sides of the middle-pressure cylinder, steam from the reheating section enters an inlet of each valve and sequentially passes through the middle-pressure regulating steam valve and the middle-pressure main steam valve and enters the middle-pressure cylinder through a middle-pressure steam guide pipe;
the structure analysis of the medium-pressure main steam valve comprises a valve rod, a valve butterfly, a valve seat, a valve shell, a valve rod sleeve, a steam distribution lever, an actuating mechanism and the like, wherein the medium-pressure main steam valve is a single-seat valve, the valve butterfly of the medium-pressure main steam valve is inverted, is positioned in a valve core of a medium-pressure regulating steam valve and has the advantages that the up-and-down movement is not limited by a bell-type structure of the regulating valve, an inner inclined plane of the valve is contacted with an outer inclined plane of the valve rod sleeve, the valve core is connected with the servomotor arranged below through the valve rod, the servomotor is a unilateral oil inlet servomotor, the servomotor is in a fully open state during normal operation and cannot be adjusted by the acting force of a spring during closing, the servomotor can be quickly closed only during starting and stopping or accidents, the safety of a unit is ensured, the sealing of the medium-pressure main steam valve adopts good sealing, and the steam leakage of the medium-pressure main steam valve rod is connected to a main machine shaft seal steam return pipe;
the structure analysis of medium pressure speed regulating valve, the medium pressure regulating valve is composed of valve rod, valve rod sleeve, valve butterfly, valve seat, valve shell and actuator, the valve core adopts bell-jar type structure, the valve core mainly bears peripheral radial force, and adds the design of pre-opening valve, and can reduce lifting force required when the valve is opened, and it can contain valve core of medium pressure main valve, and can make overall structure compact, and can ensure opening or closing of medium pressure regulating valve, and is not influenced by opening and closing state of medium pressure main valve, the valve disk is connected with driving lever by means of valve rod, one end of driving lever is hinged, and another end is controlled by oil engine, when the piston of single side oil inlet oil engine is moved up and down, the valve disk is driven by driving lever to act, when the medium pressure regulating valve is started, the medium pressure cylinder is in full-open position after starting and cutting cylinder, and can be quickly closed when the load of steam turbine is thrown, preventing the turbine from overspeed.
4. The method for on-line processing of the steam turbine pipeline leakage point according to claim 3, wherein the equipment condition analysis comprises controlling the unit load between 400MW and 480MW, adjusting the unit parameters to be stable, the test program closes the one-side ICV first and then closes the one-side RSV, the program opens the RSV first and then opens the ICV after confirming the flexible action, the one-side middle linkage activity test is finished, the valve activity test is about 2min, and the main parameters of the unit are stable during the steam inlet period of the one-side middle pressure cylinder.
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| CN201911059110.4A CN110748386A (en) | 2019-11-01 | 2019-11-01 | Method for online processing leakage point of steam turbine pipeline |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911059110.4A CN110748386A (en) | 2019-11-01 | 2019-11-01 | Method for online processing leakage point of steam turbine pipeline |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57122104A (en) * | 1981-01-21 | 1982-07-29 | Hitachi Ltd | Combined reheat valve |
| CN102116181A (en) * | 2011-01-13 | 2011-07-06 | 山东电力研究院 | Method for opening main failure valve of steam turbine with load |
| CN107587901A (en) * | 2017-09-06 | 2018-01-16 | 浙江大唐乌沙山发电有限责任公司 | Steam turbine one side can be kept to enter the speed governing EH oil systems of automotive row |
-
2019
- 2019-11-01 CN CN201911059110.4A patent/CN110748386A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57122104A (en) * | 1981-01-21 | 1982-07-29 | Hitachi Ltd | Combined reheat valve |
| CN102116181A (en) * | 2011-01-13 | 2011-07-06 | 山东电力研究院 | Method for opening main failure valve of steam turbine with load |
| CN107587901A (en) * | 2017-09-06 | 2018-01-16 | 浙江大唐乌沙山发电有限责任公司 | Steam turbine one side can be kept to enter the speed governing EH oil systems of automotive row |
Non-Patent Citations (1)
| Title |
|---|
| 张学海: "600MW汽轮机中调阀伺服阀在线更换及伺服阀卡涩原因分析", 《华电技术》 * |
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