CN108561190B - Shaft seal system of steam turbine - Google Patents
Shaft seal system of steam turbine Download PDFInfo
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- CN108561190B CN108561190B CN201810703228.5A CN201810703228A CN108561190B CN 108561190 B CN108561190 B CN 108561190B CN 201810703228 A CN201810703228 A CN 201810703228A CN 108561190 B CN108561190 B CN 108561190B
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- shaft seal
- steam
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- pressure
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Classifications
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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
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
-
- 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
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/003—Preventing or minimising internal leakage of working-fluid, e.g. between stages by packing rings; Mechanical seals
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
The invention discloses a turbine shaft seal system which comprises a high-pressure cylinder, wherein both ends of the high-pressure cylinder are connected with a high-and-medium-pressure shaft seal steam return main pipe, the outer side, close to the high-pressure cylinder, of the top end of the high-and-medium-pressure shaft seal steam return main pipe is connected with a high-pressure shaft seal steam return pipe, the outer side, close to the medium-pressure cylinder, of the top end of the high-pressure shaft seal steam return main pipe is connected with a shaft seal heater, one side, close to a water injection pipe, of the top end of the shaft seal heater is provided with a condenser, the bottom ends of the shaft seal heater are provided with a shaft seal fan, one sides, close to the steam pump steam return pipe, of the bottom ends of the high-pressure shaft seal steam return pipe and the medium-pressure shaft seal steam return pipe are provided with a deaerator, and the upper side, close to one end of a steam inlet pipe is connected with a shaft seal overflow pipe. The invention has reasonable structure and safe use, thoroughly solves the problem of lubricating oil quality degradation caused by the steam generation of the high-pressure shaft seal and the medium-pressure shaft seal, and ensures the running reliability of the unit.
Description
Technical Field
The invention relates to the technical field of steam turbines, in particular to a shaft seal system of a steam turbine.
Background
The main function of the turbine shaft seal system is to provide sealing steam for shaft seals, main steam valves and valve rod steam seals of a small turbine of a water supply pump, and simultaneously to reasonably guide or extract leakage of each steam seal, the high-pressure cylinder shaft function of the turbine is to prevent the steam from leaking outwards so as to ensure that the turbine has higher efficiency, the low-pressure cylinder shaft function of the turbine is to prevent external air from entering the turbine and ensure that the turbine has as high vacuum as possible, wherein 350M supercritical, one-time intermediate reheating, single-shaft, double-cylinder double-exhaust steam, single back pressure and steam extraction type turbines are mainly adopted, a full-cycle steam distribution mode is adopted, the shaft seal system unit is in a self-sealing operation mode during normal operation, low load is provided with a standby steam source by a cold-recovery and auxiliary steam system, main and small turbine shaft seal exhaust steam is discharged to a shaft seal cooler, part of the main steam and the valve rod leakage is returned to the shaft seal cooler, and part of the exhaust steam is discharged to a cold section of the reheater, and the main pipe is discharged to the condenser through the overflow valve when the pressure is high.
When the high-pressure and medium-pressure cylinder shaft seal steam return pipeline in the market is designed, a turbine 12.6-meter platform is usually downwards moved to a 6.3-meter platform, a U-shaped bent pipeline enters a shaft seal heater, water is easily accumulated in the U-shaped bent pipeline during unit operation, high-pressure and medium-pressure shaft seal steam return is not smooth, the high-pressure and medium-pressure shaft seal steam return cannot return to the shaft seal heater, a large amount of steam leakage is caused at the high-pressure and medium-pressure shaft seal, the high-pressure and medium-pressure shaft seal is closely abutted to a bearing bush, the lubricating oil system is in a micro negative pressure state, steam emitted by the shaft seal is blown into the lubricating oil system from a front box and a bearing box and carries nearby dust, the water content and the particle content in oil are both out of a standard range, the unit safe operation is seriously threatened, and serious potential safety hazards are brought to the unit operation.
Accordingly, one skilled in the art would be able to provide a turbine shaft seal system that addresses the problems set forth in the background above.
Disclosure of Invention
The present invention is directed to a shaft seal system for a steam turbine, which solves the above-mentioned problems.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the utility model provides a steam turbine shaft seal system, includes the high pressure cylinder, the both ends of high pressure cylinder all are connected with high medium pressure shaft seal and return the main pipe, the inboard of high medium pressure shaft seal and return the main pipe is connected with the medium pressure cylinder, the outside that the top of high medium pressure shaft seal and return the main pipe is close to the high pressure cylinder is connected with high pressure shaft seal and returns the main pipe, and the outside that the top of high medium pressure shaft seal and return the main pipe is close to the medium pressure cylinder is connected with medium pressure shaft seal and returns the main pipe, the top of high medium pressure shaft seal and return the main pipe is close to one side of medium pressure cylinder and is provided with the low pressure cylinder, the one end of high pressure shaft seal and return the main pipe is connected with the shaft seal heater, the top of shaft seal heater is connected with the water injection pipe, and one side that the top of shaft seal heater is close to the water injection pipe is installed the condenser, the bottom of Gao Zhongya and is connected with the main pipe, and the bottom of the main pipe is connected with the top of the main pipe, the top of the main pipe is connected with the top of the main pipe, the top of the main pipe is connected with the top of the vapour pump, the top of the main pipe is connected with the top of the top pipe, the lower side of one end of the steam inlet pipe, which is close to the auxiliary steam pipe, is connected with a medium-pressure combined steam valve rod steam leakage pipe, the lower side of one end of the steam inlet pipe, which is close to the medium-pressure combined steam valve rod steam leakage pipe, is connected with a high-pressure main steam valve rod steam leakage pipe, and the lower side of one end of the steam inlet pipe, which is close to the high-pressure main steam valve rod steam leakage pipe, is connected with a high-pressure valve regulating steam leakage pipe.
As a further scheme of the invention: the shaft seal heater is positioned on a platform with the height of 6.3 meters, and the high-pressure shaft seal steam return pipe and the medium-pressure shaft seal steam return pipe are both positioned on a platform with the height of 10.0 meters.
As still further aspects of the invention: the high-pressure shaft seal steam return pipe and the medium-pressure shaft seal steam return pipe are both steel pipes with the outer diameter of phi 168, and the high-pressure and medium-pressure shaft seal steam return main pipe is a steel pipe with the outer diameter of phi 219.
As still further aspects of the invention: one end of the medium-pressure shaft seal steam return pipe is connected with the shaft seal heater.
As still further aspects of the invention: one end of the shaft seal overflow pipe is connected with the condenser.
As still further aspects of the invention: the top end of the steam pump steam return pipe is connected with the high-pressure shaft seal steam return pipe and the medium-pressure shaft seal steam return pipe.
As still further aspects of the invention: and the reheating cold section pipe and the auxiliary steam pipe are communicated with an external steam source.
As still further aspects of the invention: the shaft seal heater is a structural component that transfers heat from the vapor-vapor mixture to the condensate.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, after the high-pressure steam return pipe and the medium-pressure steam return pipe are downwards moved from a 12.3m platform to a 10.0m platform, the high-pressure steam return pipe and the medium-pressure steam return pipe enter the shaft seal heater, U-shaped bent arrangement is canceled, the high-pressure shaft seal steam return pipe and the medium-pressure shaft seal steam return pipe are respectively converged into a phi 168, and the phi 219 high-pressure shaft seal steam return pipe which is directly converged into the position of the lower elevation of the operating layer by 10 m from the upper part of the operating layer, so that the phenomenon of high-pressure shaft seal and medium-pressure shaft seal steam leakage in the operation of the unit is eliminated, the lubricating oil quality is qualified, the problem of lubricating oil quality degradation caused by the high-pressure shaft seal and the medium-pressure shaft seal steam leakage is thoroughly solved, and the operation reliability of the unit is ensured.
Drawings
FIG. 1 is a schematic view of a shaft seal system of a steam turbine.
In the figure: 1. a high-pressure cylinder; 2. a high-medium pressure shaft seal steam return main pipe; 3. a medium pressure cylinder; 4. a low pressure cylinder; 5. a deaerator; 6. a high-pressure shaft seal steam return pipe; 7. a steam pump return pipe; 8. a medium-pressure shaft seal steam return pipe; 9. a water injection pipe; 10. a condenser; 11. a shaft seal heater; 12. a shaft seal fan; 13. a condensed water inlet pipe; 14. a steam pump; 15. a steam pump steam inlet pipe; 16. a shaft seal overflow pipe; 17. a main steam pipe; 18. reheat the cold leg pipe; 19. an auxiliary steam pipe; 20. a medium-pressure combined steam valve rod steam leakage pipe; 21. a high-pressure main valve rod steam leakage pipe; 22. high-pressure door-regulating leakage pipe; 23. a steam inlet pipe; 24. high and medium pressure shaft seal inlet main pipe.
Detailed Description
Referring to fig. 1, in an embodiment of the present invention, a turbine shaft seal system includes a high pressure cylinder 1, both ends of the high pressure cylinder 1 are connected with a high and medium pressure shaft seal steam return main pipe 2, an inner side of the high and medium pressure shaft seal steam return main pipe 2 is connected with a medium pressure cylinder 3, an outer side of a top end of the high and medium pressure shaft seal steam return main pipe 2 close to the high pressure cylinder 1 is connected with a high and medium pressure shaft seal steam return pipe 6, an outer side of a top end of the high and medium pressure shaft seal steam return main pipe 2 close to the medium pressure cylinder 3 is connected with a medium pressure shaft seal steam return pipe 8, a bottom end of the high and medium pressure shaft seal steam return main pipe 2 is connected with a high and medium pressure shaft seal steam inlet main pipe 24, one side of the top end of the high and medium pressure shaft seal steam inlet main pipe 24 close to the medium pressure cylinder 3 is provided with a low pressure cylinder 4, one end of the high pressure shaft seal steam return pipe 6 is connected with a shaft seal heater 11, a top end of the shaft seal heater 11 is connected with a water injection pipe 9, one side of the top end of the shaft seal heater 11 close to the water injection pipe 9 is provided with a condenser 10, the bottom end of the shaft seal heater 11 is provided with a shaft seal fan 12, the bottom end of one side of a high and medium pressure shaft seal steam inlet main pipe 24 is connected with a steam inlet pipe 23, the bottom end of the other side of the high and medium pressure shaft seal steam inlet main pipe 24 is connected with a steam pump steam inlet pipe 15, the inner sides of the bottom end of the high and medium pressure shaft seal steam inlet main pipe 24, which are close to the steam pump steam inlet pipe 15 and the steam inlet pipe 23, are connected with a condensate water inlet pipe 13, one end of the steam pump steam inlet pipe 15 is provided with a steam pump 14, the top end of the steam pump 14 is connected with a steam pump steam return pipe 7, one side, which is close to the steam pump steam return pipe 7, of the bottom ends of the high and medium pressure shaft seal steam return pipes 6 and 8 is provided with a deaerator 5, the upper side of one end of the steam inlet pipe 23 is connected with a shaft seal 16, the lower side, which is close to the steam inlet pipe 23 is connected with a main steam pipe 17, the lower side, which is close to the main steam pipe 17, is connected with a reheat cold section pipe 18, the bottom of reheat cold leg pipe 18 is connected with supplementary steam pipe 19, and the downside that the one end of admission pipe 23 is close to supplementary steam pipe 19 is connected with middling pressure joint steam valve pole steam leakage pipe 20, and the downside that the one end of admission pipe 23 is close to middling pressure joint steam valve pole steam leakage pipe 20 is connected with high-pressure main steam valve pole steam leakage pipe 21, and the downside that the one end of admission pipe 23 is close to high-pressure main steam valve pole steam leakage pipe 21 is connected with high-pressure valve gas leakage pipe 22.
In order to prevent the unsmooth return of the high-pressure shaft seal steam return pipe 6 and the medium-pressure shaft seal steam return pipe 8, the shaft seal heater 11 is positioned on a platform with the height of 6.3 meters, the high-pressure shaft seal steam return pipe 6 and the medium-pressure shaft seal steam return pipe 8 are both positioned on a platform with the height of 10.0 meters, in order to prevent the mutual interference of the high-pressure shaft seal steam return pipe 6 and the medium-pressure shaft seal steam return pipe 8, the high-pressure shaft seal steam return pipe 6 and the medium-pressure shaft seal steam return pipe 8 are both steel pipes with the outer diameter of phi 168, the high-pressure medium-pressure shaft seal steam return main pipe 2 is a steel pipe with the outer diameter of phi 219, in order to ensure the smooth return of the medium-pressure shaft seal steam return pipe 8, one end of the medium-pressure shaft seal steam return pipe 8 is connected with the shaft seal heater 11, in order to discharge the surplus steam into the condenser 10, one end of the shaft seal overflow pipe 16 is connected with the condenser 10, in order to make the steam flow back into the high-pressure shaft seal return pipe 6 and the medium-pressure shaft seal return pipe 8, the top end of the steam pump return pipe 7 is connected with the high-pressure shaft seal return pipe 6 and the medium-pressure shaft seal return pipe 8, in order to prevent the gas leakage of the shaft seal system in the initial stage of starting, when the high-pressure cylinder does not enter steam or is under low load, the reheating cold section pipe 18 and the auxiliary steam pipe 19 are communicated with an external steam source, and in order to transfer heat to condensate, the shaft seal heater 11 is a structural member for transferring the heat of the steam-gas mixture to the condensate.
The working principle of the invention is as follows: the initial stage of starting, the inlet pressure is lower when high-pressure cylinder 1 does not enter the steam or low load, the shaft seal system supplies the steam by reheat cold section pipe 18 and auxiliary steam pipe 19 at this moment, supply high-pressure cylinder 1 and low-pressure cylinder 4 respectively, after passing each shaft seal, part of steam enters the inside of the steam turbine, part of steam returns to shaft seal heater 11 through high-pressure shaft seal return pipe 6 and middling pressure shaft seal return pipe 8, finally return to condenser 10 through the shaft seal, at the time of high load, the inlet pressure of high-pressure cylinder 1 is higher, be greater than the shaft seal system and supply the steam, at this moment, high-pressure cylinder 1 leaks gas to high middling pressure shaft seal return pipe 2, then discharge unnecessary steam into condenser 10 through shaft seal overflow pipe 16, form the negative pressure in the shaft seal heater 11 through shaft seal fan 12, avoid shaft seal system return not smooth, transmit the steam-gas mixture heat to the condensate through shaft seal heater 11, be used for cooling the steam-gas mixture that middling pressure joint steam valve lever drain pipe 20 and high-pressure main steam valve lever drain pipe 21 take out, get rid of the oxygen in high-pressure shaft seal return pipe 6 and middling pressure return pipe 8 through ware 5.
Claims (8)
1. The utility model provides a steam turbine shaft seal system, includes high pressure cylinder (1), its characterized in that, the both ends of high pressure cylinder (1) all are connected with high and medium pressure shaft seal steam header (2), the inboard of high and medium pressure shaft seal steam header (2) is connected with well pressure cylinder (3), the outside that the top of high and medium pressure shaft seal steam header (2) is close to high pressure cylinder (1) is connected with high pressure shaft seal steam header (6), and the outside that the top of high and medium pressure shaft seal steam header (2) is close to medium pressure cylinder (3) is connected with well pressure shaft seal steam header (8), the bottom of high and medium pressure shaft seal steam header (2) is connected with high and medium pressure shaft seal steam inlet (24), one side that the top of high and medium pressure shaft seal steam header (24) is close to medium pressure cylinder (3) is provided with low pressure cylinder (4), one side that the top of high and medium pressure steam header (6) is close to medium pressure cylinder (11), the top of heater (11) is connected with water injection pipe (9), and the top of high and the other side that is close to medium pressure steam header (11) is connected with the steam pump steam header (12), the bottom of installing steam header (24) is close to medium pressure steam turbine shaft seal (12), the utility model discloses a high-medium pressure shaft seal steam inlet main pipe (24), the bottom of high-medium pressure shaft seal steam inlet main pipe (24) is close to the inboard of pump steam inlet pipe (15) and steam inlet pipe (23) and is connected with condensate water inlet pipe (13), pump (14) are installed to the one end of pump steam inlet pipe (15), the top of pump (14) is connected with pump steam return pipe (7), oxygen-eliminating device (5) are installed to the one side that is close to pump steam return pipe (7) in the bottom of high-pressure shaft seal steam return pipe (6) and medium-pressure shaft seal steam return pipe (8), the upside of the one end of steam inlet pipe (23) is connected with shaft seal overflow pipe (16), and the downside that is close to shaft seal overflow pipe (16) in one end of steam inlet pipe (23) is connected with main steam pipe (17), the downside that is close to main steam pipe (17) is connected with reheat cold section pipe (18), the bottom of reheat cold section pipe (18) is connected with auxiliary steam pipe (19), one end of steam inlet pipe (23) is close to auxiliary steam return pipe (19) is close to low pressure valve (20) and is connected with high-pressure drain pipe (20), one end of the steam inlet pipe (23) is close to the lower side of the high-pressure main steam valve rod steam leakage pipe (21) and is connected with a high-pressure valve regulating steam leakage pipe (22).
2. The turbine shaft seal system according to claim 1, characterized in that the shaft seal heater (11) is located on a platform with a height of 6.3 meters, and the high pressure shaft seal return pipe (6) and the medium pressure shaft seal return pipe (8) are both located on a platform with a height of 10.0 meters.
3. The turbine shaft seal system according to claim 1, wherein the high-pressure shaft seal steam return pipe (6) and the medium-pressure shaft seal steam return pipe (8) are steel pipes with the outer diameter of phi 168, and the high-medium-pressure shaft seal steam return main pipe (2) is a steel pipe with the outer diameter of phi 219.
4. A steam turbine shaft seal system according to claim 1, characterized in that one end of the intermediate pressure shaft seal return pipe (8) is connected to a shaft seal heater (11).
5. The turbine shaft seal system of claim 1 wherein one end of the shaft seal overflow tube (16) is connected to the condenser (10).
6. The turbine shaft seal system according to claim 1, wherein the top end of the pump return pipe (7) is connected with the high-pressure shaft seal return pipe (6) and the medium-pressure shaft seal return pipe (8).
7. The turbine shaft seal system of claim 1 wherein the reheat cold leg pipe (18) and auxiliary steam pipe (19) are both in communication with an external steam source.
8. A turbine shaft seal system according to claim 1, characterized in that the shaft seal heater (11) is a structural member for transferring heat from the steam-gas mixture to the condensate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810703228.5A CN108561190B (en) | 2018-06-30 | 2018-06-30 | Shaft seal system of steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810703228.5A CN108561190B (en) | 2018-06-30 | 2018-06-30 | Shaft seal system of steam turbine |
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| Publication Number | Publication Date |
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| CN108561190A CN108561190A (en) | 2018-09-21 |
| CN108561190B true CN108561190B (en) | 2023-09-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810703228.5A Active CN108561190B (en) | 2018-06-30 | 2018-06-30 | Shaft seal system of steam turbine |
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| CN (1) | CN108561190B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110332017B (en) * | 2019-08-08 | 2022-04-22 | 国家电投集团河南电力有限公司 | Self-adaptive shaft seal steam supply system |
| CN114046184A (en) * | 2021-10-22 | 2022-02-15 | 安徽长江钢铁股份有限公司 | Cooling device for steam turbine shaft seal air leakage |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104018890A (en) * | 2014-06-05 | 2014-09-03 | 中国电力工程顾问集团东北电力设计院 | Turbine low pressure cylinder end shaft seal steam supply system |
| JP2015158190A (en) * | 2014-02-25 | 2015-09-03 | 株式会社東芝 | steam turbine system |
| CN107246284A (en) * | 2017-06-27 | 2017-10-13 | 东方电气集团东方汽轮机有限公司 | A kind of shaft seal steam supply system of extra-supercritical unit containing electric heater |
| CN107605541A (en) * | 2017-09-27 | 2018-01-19 | 山东中实易通集团有限公司 | Prevent 1000MW supercritical turbine packings from seizing axle envelope electric heater system and method |
| CN207348904U (en) * | 2017-10-24 | 2018-05-11 | 湛江电力有限公司 | A kind of one grade of steam loss regulating system of turbine shaft seal |
| CN208619177U (en) * | 2018-06-30 | 2019-03-19 | 神华国华广投（柳州）发电有限责任公司 | A kind of steam turbine gland system |
-
2018
- 2018-06-30 CN CN201810703228.5A patent/CN108561190B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015158190A (en) * | 2014-02-25 | 2015-09-03 | 株式会社東芝 | steam turbine system |
| CN104018890A (en) * | 2014-06-05 | 2014-09-03 | 中国电力工程顾问集团东北电力设计院 | Turbine low pressure cylinder end shaft seal steam supply system |
| CN107246284A (en) * | 2017-06-27 | 2017-10-13 | 东方电气集团东方汽轮机有限公司 | A kind of shaft seal steam supply system of extra-supercritical unit containing electric heater |
| CN107605541A (en) * | 2017-09-27 | 2018-01-19 | 山东中实易通集团有限公司 | Prevent 1000MW supercritical turbine packings from seizing axle envelope electric heater system and method |
| CN207348904U (en) * | 2017-10-24 | 2018-05-11 | 湛江电力有限公司 | A kind of one grade of steam loss regulating system of turbine shaft seal |
| CN208619177U (en) * | 2018-06-30 | 2019-03-19 | 神华国华广投（柳州）发电有限责任公司 | A kind of steam turbine gland system |
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| CN108561190A (en) | 2018-09-21 |
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Address after: 545600 No. 168, Jianzhong West, Luzhai County, Liuzhou City, Guangxi Zhuang Autonomous Region Applicant after: Guoneng guangtou Liuzhou Power Generation Co.,Ltd. Address before: 545600 No. 168, Jianzhong West, Luzhai County, Liuzhou City, Guangxi Zhuang Autonomous Region Applicant before: SHENHUA GUOHUA GUANGTOU (LIUZHOU) POWER GENERATION CO.,LTD. |
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