CN108561190A - A kind of steam turbine gland system - Google Patents
A kind of steam turbine gland system Download PDFInfo
- Publication number
- CN108561190A CN108561190A CN201810703228.5A CN201810703228A CN108561190A CN 108561190 A CN108561190 A CN 108561190A CN 201810703228 A CN201810703228 A CN 201810703228A CN 108561190 A CN108561190 A CN 108561190A
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- China
- Prior art keywords
- pipe
- high pressure
- steam
- return tube
- shaft seal
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Classifications
-
- 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 kind of steam turbine gland systems, including high pressure cylinder, the both ends of the high pressure cylinder are respectively connected with high pressure axle envelope back-steam main pipe, the top of the high pressure axle envelope back-steam main pipe is connected with high pressure shaft seal return tube on the outside of high pressure cylinder, and the top of high pressure axle envelope back-steam main pipe is connected with middle last item envelope return tube on the outside of intermediate pressure cylinder, one end of the high pressure shaft seal return tube is connected with gland heater, the top of the gland heater is equipped with condenser close to the side of water injection pipe, the bottom end of the gland heater is equipped with axial sealing blower fan, the bottom end of the high pressure shaft seal return tube and middle last item envelope return tube is equipped with oxygen-eliminating device close to the side of heat pump return tube, shaft seal overflow pipe is connected on the upside of one end of the steam inlet pipe.Structure of the invention is reasonable, safe to use, and so that high pressure shaft seal and middle last item envelope is emitted vapour causes oil quality of lubricant deterioration problem thoroughly to solve, and ensures unit operation reliability.
Description
Technical field
The present invention relates to steam turbine technology field, specifically a kind of steam turbine gland system.
Background technology
The major function of steam turbine gland system is to steam turbine, the axle envelope of feed pump small turbine and stop valve, adjusting
The valve rod packing of valve provides sealed steam, while by the gas leakage reasonable direction of each packing or extraction, the high pressure cylinder shaft work of steam turbine
Can prevent steam to outward leakage, to ensure that steam turbine has higher efficiency, the low pressure (LP) cylinder s function of steam turbine is to prevent the external world
Air enter inside steam turbine, ensure that steam turbine has a vacuum as high as possible, wherein 350M is overcritical, a resuperheat,
Single shaft, twin-cylinder double flow, single back pressure, extraction-condensing steam turbine, mainly use full admission distribution way of steam, gland seal system unit
Be the self sealss method of operation when normal operation, underload by it is cold again, Auxiliary Steam standby steam source, main, small turbine are provided
Leak-off steam drains into shaft sealing cooler, and main inlet throttle-stop valve and a pitch bar leakage vapour part return to shaft sealing cooler, and a part of steam discharge is to again
Cold section of hot device, condenser is discharged to when axle envelope main-piping pressure is high by overflow valve by excess steam.
High currently on the market, intermediate pressure cylinder axle envelope steam exhaust piping is typically downward by 12.6 meters of platforms of steam turbine in design
To 6.3 meters of platforms, gland heater is entered by U-shaped curved pipe, when unit operation, U-shaped curved pipe was easy ponding, senior middle school's last item
It is unsmooth to seal back-steam, gland heater can not be back to, cause largely to leak vapour at high pressure axle envelope, high pressure axle envelope abuts bearing shell, because
Lubricating oil system is in micro-vacuum state, and the steam that axle envelope is emerged scurries into lubricating oil system from preceding case, bearing housing, and carries attached
Close dust causes Water in oil amount and granule content to exceed critical field, seriously threatens unit safety operation, is transported to unit
Row brings severe compromise.
Therefore, those skilled in the art provide a kind of steam turbine gland system, to solve to propose in above-mentioned background technology
The problem of.
Invention content
The purpose of the present invention is to provide a kind of steam turbine gland systems, to solve mentioned above in the background art ask
Topic.
To achieve the above object, the present invention provides the following technical solutions：
The both ends of a kind of steam turbine gland system, including high pressure cylinder, the high pressure cylinder are respectively connected with high pressure axle envelope back-steam main pipe,
Intermediate pressure cylinder is connected on the inside of the high pressure axle envelope back-steam main pipe, the top of the high pressure axle envelope back-steam main pipe is close to high pressure
High pressure shaft seal return tube is connected on the outside of cylinder, and the top of high pressure axle envelope back-steam main pipe is connected on the outside of intermediate pressure cylinder
Middle last item seals return tube, and the bottom end of the high pressure axle envelope back-steam main pipe is connected with high pressure axle envelope into vapour main pipe, the senior middle school
Last item seals the top into vapour main pipe and the side of intermediate pressure cylinder is provided with low pressure (LP) cylinder, one end connection of the high pressure shaft seal return tube
There is gland heater, the top of the gland heater is connected with water injection pipe, and the top of gland heater is close to water injection pipe
Side is equipped with condenser, and the bottom end of the gland heater is equipped with axial sealing blower fan, and the high pressure axle envelope is into vapour main pipe
The bottom end of side is connected with steam inlet pipe, and the bottom end of high pressure axle envelope into the other side of vapour main pipe is connected with heat pump steam inlet pipe, institute
It states high pressure axle envelope and is connected with condensed water inlet pipe, the vapour on the inside of heat pump steam inlet pipe and steam inlet pipe into the bottom end of vapour main pipe
One end of pump steam inlet pipe is equipped with heat pump, and the top of the heat pump is connected with heat pump return tube, the high pressure shaft seal return tube and
The bottom end of middle last item envelope return tube is equipped with oxygen-eliminating device close to the side of heat pump return tube, connects on the upside of one end of the steam inlet pipe
It is connected to shaft seal overflow pipe, and one end of steam inlet pipe is connected with live steam pipe on the downside of shaft seal overflow pipe, the one of the steam inlet pipe
End is connected with cold section of pipe of reheating on the downside of live steam pipe, and the bottom end of the cold section of pipe of reheating is connected with air vent pipework, described
One end of steam inlet pipe is connected with reheat stop valve door rod leakage steam pipe on the downside of air vent pipework, and one end of steam inlet pipe is leaned on
It is connected with high pressure main stop valve door rod leakage steam pipe on the downside of nearly reheat stop valve door rod leakage steam pipe, one end of the steam inlet pipe is close
It is connected with high-pressure governing valve air leakage pipe on the downside of high pressure main stop valve door rod leakage steam pipe.
As a further solution of the present invention：The gland heater is located on the platform that height is 6.3 meters, the high pressure
Axle envelope return tube and middle last item envelope return tube are respectively positioned on 10.0 meters of platform.
As further scheme of the invention：The high pressure shaft seal return tube and middle last item envelope return tube are outside one kind
Diameter is the steel pipe of Φ 168, and the high pressure axle envelope back-steam main pipe is the steel pipe that a kind of outer diameter is Φ 219.
As further scheme of the invention：One end of medium pressure axle envelope return tube is connect with gland heater.
As further scheme of the invention：One end of the shaft seal overflow pipe is connect with condenser.
As further scheme of the invention：The top of the heat pump return tube and high pressure shaft seal return tube and middle last item
Seal return tube connection.
As further scheme of the invention：Cold section of pipe of the reheating and air vent pipework connect with external vapour source
It is logical.
As further scheme of the invention：The gland heater giving vapour-gas mixture heat transfer to be a kind of
The component of the structure of condensed water.
Compared with prior art, beneficial effects of the present invention：
The present invention enters back into axis by the way that high pressure return tube is pushed back steam pipe after the platform of 12.3m comes downwards to 10.0m platforms in
Heater is sealed, cancels U-shaped curved arrangement, high pressure shaft seal return tube and middle last item return tube is respectively converged into a Φ 168 respectively, from
219 high pressure axle envelope back-steam main pipes of Φ under operating layer top is directly converged into operating layer at 10 meters of absolute altitude, to make unit operation
Mesohigh axle envelope and middle last item envelope emit the elimination of vapour phenomenon, and oil quality of lubricant is qualified, emit vapour to make high pressure shaft seal and middle last item seal
Cause oil quality of lubricant deterioration problem thoroughly to solve, ensures unit operation reliability.
Description of the drawings
Fig. 1 is a kind of structural schematic diagram of steam turbine gland system.
In figure：1, high pressure cylinder；2, high pressure axle envelope back-steam main pipe；3, intermediate pressure cylinder；4, low pressure (LP) cylinder；5, oxygen-eliminating device；6, high pressure
Axle envelope return tube；7, heat pump return tube；8, middle last item seals return tube；9, water injection pipe；10, condenser；11, gland heater；12、
Axial sealing blower fan；13, condensed water inlet pipe；14, heat pump；15, heat pump steam inlet pipe；16, shaft seal overflow pipe；17, live steam pipe；18, reheating
Cold section of pipe；19, air vent pipework；20, reheat stop valve door rod leaks steam pipe；21, high pressure main stop valve door rod leaks steam pipe；22, high
Press pitch air leakage pipe；23, steam inlet pipe；24, high pressure axle envelope is into vapour main pipe.
Specific implementation mode
Referring to Fig. 1, in the embodiment of the present invention, a kind of steam turbine gland system, including high pressure cylinder 1, the both ends of high pressure cylinder 1
It is respectively connected with high pressure axle envelope back-steam main pipe 2, the inside of high pressure axle envelope back-steam main pipe 2 is connected with intermediate pressure cylinder 3, high pressure axle envelope
The top of back-steam main pipe 2 is connected with high pressure shaft seal return tube 6, the top of high pressure axle envelope back-steam main pipe 2 close to the outside of high pressure cylinder 1
End is connected with middle last item envelope return tube 8 close to the outside of intermediate pressure cylinder 3, and the bottom end of high pressure axle envelope back-steam main pipe 2 is connected with senior middle school
Last item is sealed into vapour main pipe 24, and high pressure axle envelope is provided with low pressure (LP) cylinder 4 into the top of vapour main pipe 24 close to the side of intermediate pressure cylinder 3, high
One end of last item envelope return tube 6 is connected with gland heater 11, and the top of gland heater 11 is connected with water injection pipe 9, and axle envelope adds
The top of hot device 11 is equipped with condenser 10 close to the side of water injection pipe 9, and the bottom end of gland heater 11 is equipped with axial sealing blower fan
12, the bottom end of high pressure axle envelope into the side of vapour main pipe 24 is connected with steam inlet pipe 23, and high pressure axle envelope is another into vapour main pipe 24
The bottom end of side is connected with heat pump steam inlet pipe 15, and high pressure axle envelope is into the bottom end of vapour main pipe 24 close to heat pump steam inlet pipe 15 and steam inlet pipe
23 inside is connected with condensed water inlet pipe 13, and one end of heat pump steam inlet pipe 15 is equipped with heat pump 14, and the top of heat pump 14 is connected with
The bottom end of heat pump return tube 7, high pressure shaft seal return tube 6 and middle last item envelope return tube 8 is equipped with close to the side of heat pump return tube 7
Oxygen-eliminating device 5 is connected with shaft seal overflow pipe 16 on the upside of one end of steam inlet pipe 23, and one end of steam inlet pipe 23 is close to shaft seal overflow pipe 16
Downside be connected with live steam pipe 17, one end of steam inlet pipe 23 is connected with cold section of pipe 18 of reheating, reheating close to the downside of live steam pipe 17
The bottom end of cold section of pipe 18 is connected with air vent pipework 19, during one end of steam inlet pipe 23 is connected with close to the downside of air vent pipework 19
Combined regulating valve door rod is pressed to leak steam pipe 20, one end of steam inlet pipe 23 is connected with close to the downside of reheat stop valve door rod leakage steam pipe 20
High pressure main stop valve door rod leaks steam pipe 21, and one end of steam inlet pipe 23 is connected with height close to the downside of high pressure main stop valve door rod leakage steam pipe 21
Press pitch air leakage pipe 22.
High pressure shaft seal return tube 6 and middle last item envelope 8 back-steam of return tube are unsmooth in order to prevent, and gland heater 11 is located at height
For on 6.3 meters of platforms, high pressure shaft seal return tube 6 and middle last item envelope return tube 8 are respectively positioned on 10.0 meters of platform, in order to prevent
High pressure shaft seal return tube 6 and middle last item envelope return tube 8 interfere with each other, and high pressure shaft seal return tube 6 and middle last item envelope return tube 8 are
A kind of outer diameter is the steel pipe of Φ 168, and high pressure axle envelope back-steam main pipe 2 is the steel pipe that a kind of outer diameter is Φ 219, in order to make middle last item
Return tube 8 back-steam smoothness is sealed, one end of middle last item envelope return tube 8 is connect with gland heater 11, in order to which excess steam to be discharged to
In condenser 10, one end of shaft seal overflow pipe 16 is connect with condenser 10, in order to make opposing steam flow to 6 He of high pressure shaft seal return tube
In middle last item envelope return tube 8, the top of heat pump return tube 7 is connect with high pressure shaft seal return tube 6 and middle last item envelope return tube 8, is
Prevent gland seal system gas leakage when initial start stage, high pressure cylinder be not into vapour or underload, cold section of pipe 18 of reheating and auxiliary steam
Pipe 19 is connected to external vapour source, in order to which to condensation Water transport heat, gland heater 11 is a kind of by vapour-gas mixture heat
Amount passes to the component of the structure of condensed water.
The operation principle of the present invention：Initial start stage, high pressure cylinder 1 be not relatively low into initial steam pressure when vapour or underload, at this time
Gland seal system is supplied respectively to high pressure cylinder 1 and low pressure (LP) cylinder 4, by each axis by cold section of pipe 18 of reheating and 19 steam supply of air vent pipework
It is honored as a queen, some vapor enters the inside of steam turbine, and some vapor seals return tube 8 by high pressure shaft seal return tube 6 and middle last item
Gland heater 11 is returned to, condenser 10 is returned to finally by axle envelope, when high load capacity, 1 initial steam pressure of high pressure cylinder is higher, is more than axis
Envelope system steam supply, 1 gas leakage of high pressure cylinder at this time is to senior middle school last item envelope back-steam main pipe 2, then by shaft seal overflow pipe 16 by excess steam
It is discharged in condenser 10, makes to form negative pressure in gland heater 11 by axial sealing blower fan 12, avoid gland seal system back-steam unsmooth, lead to
Gland heater 11 is crossed by vapour-gas mixture heat transfer to condensed water, leaks steam pipe 20 for cooling down reheat stop valve door rod
The vapour-gas mixture extracted out with high pressure main stop valve door rod leakage steam pipe 21 removes high pressure shaft seal return tube 6 in by oxygen-eliminating device 5
Last item seals the oxygen in steam in return tube 8.
Claims (8)
1. a kind of steam turbine gland system, including high pressure cylinder（1）, which is characterized in that the high pressure cylinder（1）Both ends be respectively connected with
High pressure axle envelope back-steam main pipe（2）, the high pressure axle envelope back-steam main pipe（2）Inside be connected with intermediate pressure cylinder（3）, the senior middle school
Last item seals back-steam main pipe（2）Top close to high pressure cylinder（1）Outside be connected with high pressure shaft seal return tube（6）, and senior middle school's last item
Seal back-steam main pipe（2）Top close to intermediate pressure cylinder（3）Outside be connected with middle last item envelope return tube（8）, the high pressure axle envelope
Back-steam main pipe（2）Bottom end be connected with high pressure axle envelope into vapour main pipe（24）, the high pressure axle envelope is into vapour main pipe（24）Top
End is close to intermediate pressure cylinder（3）Side be provided with low pressure (LP) cylinder（4）, the high pressure shaft seal return tube（6）One end be connected with axle envelope and add
Hot device（11）, the gland heater（11）Top be connected with water injection pipe（9）, and gland heater（11）Top close to note
Water pipe（9）Side condenser is installed（10）, the gland heater（11）Bottom end axial sealing blower fan is installed（12）, described
High pressure axle envelope is into vapour main pipe（24）The bottom end of side be connected with steam inlet pipe（23）, and high pressure axle envelope is into vapour main pipe（24）'s
The bottom end of the other side is connected with heat pump steam inlet pipe（15）, the high pressure axle envelope is into vapour main pipe（24）Bottom end close to heat pump into vapour
Pipe（15）And steam inlet pipe（23）Inside be connected with condensed water inlet pipe（13）, the heat pump steam inlet pipe（15）One end vapour is installed
Pump（14）, the heat pump（14）Top be connected with heat pump return tube（7）, the high pressure shaft seal return tube（6）It is sealed with middle last item
Return tube（8）Bottom end close to heat pump return tube（7）Side oxygen-eliminating device is installed（5）, the steam inlet pipe（23）One end
Upside is connected with shaft seal overflow pipe（16）, and steam inlet pipe（23）One end close to shaft seal overflow pipe（16）Downside be connected with main vapour
Pipe（17）, the steam inlet pipe（23）One end close to live steam pipe（17）Downside be connected with cold section of reheating pipe（18）, the reheating
Cold section of pipe（18）Bottom end be connected with air vent pipework（19）, the steam inlet pipe（23）One end close to air vent pipework（19）'s
Downside is connected with reheat stop valve door rod leakage steam pipe（20）, and steam inlet pipe（23）One end close to reheat stop valve door rod leak
Steam pipe（20）Downside be connected with high pressure main stop valve door rod leakage steam pipe（21）, the steam inlet pipe（23）One end close to the main vapour of high pressure
Valve lever leaks steam pipe（21）Downside be connected with high-pressure governing valve air leakage pipe（22）.
2. a kind of steam turbine gland system according to claim 1, which is characterized in that the gland heater（11）It is located at
On the platform that height is 6.3 meters, the high pressure shaft seal return tube（6）Return tube is sealed with middle last item（8）It is respectively positioned on 10.0 meters flat
On platform.
3. a kind of steam turbine gland system according to claim 1, which is characterized in that the high pressure shaft seal return tube（6）
Return tube is sealed with middle last item（8）It is the steel pipe that a kind of outer diameter is Φ 168, the high pressure axle envelope back-steam main pipe（2）For one kind
Outer diameter is the steel pipe of Φ 219.
4. a kind of steam turbine gland system according to claim 1, which is characterized in that medium pressure axle envelope return tube（8）
One end and gland heater（11）Connection.
5. a kind of steam turbine gland system according to claim 1, which is characterized in that the shaft seal overflow pipe（16）One
End and condenser（10）Connection.
6. a kind of steam turbine gland system according to claim 1, which is characterized in that the heat pump return tube（7）Top
End and high pressure shaft seal return tube（6）Return tube is sealed with middle last item（8）Connection.
7. a kind of steam turbine gland system according to claim 1, which is characterized in that cold section of pipe of the reheating（18）With it is auxiliary
Help steam pipe（19）It is connected to external vapour source.
8. a kind of steam turbine gland system according to claim 1, which is characterized in that the gland heater（11）It is one
Kind is by vapour-gas mixture heat transfer to the component of the structure of condensed water.
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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108561190A true CN108561190A (en) | 2018-09-21 |
| CN108561190B CN108561190B (en) | 2023-09-26 |
Family
ID=63555426
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810703228.5A Active CN108561190B (en) | 2018-06-30 | 2018-06-30 | Shaft seal system of steam turbine |
Country Status (1)
| Country | Link |
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| CN (1) | CN108561190B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110332017A (en) * | 2019-08-08 | 2019-10-15 | 国家电投集团河南电力有限公司技术信息中心 | A kind of 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 |
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| 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 |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110332017A (en) * | 2019-08-08 | 2019-10-15 | 国家电投集团河南电力有限公司技术信息中心 | A kind of adaptive shaft seal steam supply system |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108561190B (en) | 2023-09-26 |
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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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