CN112879105A - Steam sealing system of back pressure steam turbine - Google Patents
Steam sealing system of back pressure steam turbine Download PDFInfo
- Publication number
- CN112879105A CN112879105A CN202110068777.1A CN202110068777A CN112879105A CN 112879105 A CN112879105 A CN 112879105A CN 202110068777 A CN202110068777 A CN 202110068777A CN 112879105 A CN112879105 A CN 112879105A
- Authority
- CN
- China
- Prior art keywords
- steam
- steam seal
- pipeline
- seal
- leakage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
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
- F01D11/02—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type
- F01D11/04—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type using sealing fluid, e.g. steam
-
- 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
- F01D25/08—Cooling; Heating; Heat-insulation
- F01D25/12—Cooling
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
The invention relates to a gland sealing system of a back pressure turbine, comprising: the device comprises a back press, a steam seal steam leakage unit and a steam seal cooler unit; the steam seal steam leakage unit is connected with the backpressure machine and can transmit the steam seal steam leakage discharged from the backpressure machine to the steam seal cooler unit for condensation to obtain liquid water; the steam seal cooler unit can condense steam seal leakage steam to obtain liquid water which is discharged into the drainage flash tank. The steam seal system provided by the invention can effectively solve the problem of the steam leakage of the steam turbine steam seal, so that the steam seal system achieves a good steam seal effect, and the steam seal system of the steam turbine is simplified and meets the relevant design requirements of the steam seal system.
Description
Technical Field
The invention belongs to the technical field of steam turbine power generation, and particularly relates to a steam seal system of a back pressure steam turbine.
Background
The back pressure of the back pressure steam turbine is high, unlike a sealing steam feeding system of a condensing steam turbine, a high back pressure steam turbine does not have a regenerative system for the cascade utilization of leaked steam, so that problems can be brought to the destination of the steam seal leaked steam at the front shaft end and the rear shaft end of the back pressure steam turbine and the design of a steam seal system, the steam seal system and equipment are selected with certain difficulty, the system is complex, even the steam seal leaked steam can only be discharged to the air, and waste is caused.
Disclosure of Invention
Technical problem to be solved
In order to solve the above problems in the prior art, the present invention provides a steam seal system of a back pressure steam turbine, which can effectively solve the problem of the steam leakage of the steam seal of the steam turbine, so that the steam seal system achieves a good steam sealing effect, and the steam seal system of the steam turbine is simplified and meets the related design requirements of the steam seal system.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
a gland sealing system for a back pressure turbine comprising: the device comprises a back press, a steam seal steam leakage unit and a steam seal cooler unit;
the steam seal steam leakage unit is connected with the backpressure machine and can transmit the steam seal steam leakage discharged from the backpressure machine to the steam seal cooler unit for condensation to obtain liquid water;
the steam seal cooler unit can condense steam seal leakage steam to obtain liquid water which is discharged into the drainage flash tank.
Preferably, the gland sealing steam leakage unit comprises: the high-pressure shaft end steam seal pipeline group, the low-pressure shaft end steam seal pipeline group and the steam seal main pipe are arranged in the high-pressure shaft end steam seal pipeline group;
one end of the high-pressure shaft end steam seal pipeline group is communicated with the high-pressure shaft end of the back press;
one end of the low-pressure shaft end steam seal pipeline group is communicated with a low-pressure shaft end of the back press;
the other end of the high-pressure shaft end steam seal pipeline group is communicated with the inlet end of the steam seal main pipe;
the other end of the low-pressure shaft end steam seal pipeline group is communicated with the inlet end of the steam seal main pipe;
the outlet end of the steam seal main pipe is communicated with the steam seal cooler unit.
Preferably, the high-pressure shaft end gland sealing pipeline group comprises: a first gland sealing pipeline, a second gland sealing pipeline and a third gland sealing pipeline;
the low pressure axle head gland seal pipeline group includes: a fourth gland seal pipeline, a fifth gland seal pipeline and a sixth gland seal pipeline;
the first steam seal pipeline, the second steam seal pipeline, the fourth steam seal pipeline and the fifth steam seal pipeline are all provided with steam throttling devices.
Preferably, a steam throttling device positioned on the first steam seal pipeline can control the steam seal leakage pressure and the steam leakage amount of the first steam seal pipeline;
and the steam throttling device positioned on the second steam seal pipeline can control the steam seal leakage pressure and the steam leakage quantity of the second steam seal pipeline.
Preferably, a steam throttling device positioned on the fourth steam seal pipeline can control the steam seal leakage pressure and the steam leakage amount of the fourth steam seal pipeline;
the steam throttling device on the fifth steam seal pipeline can control the steam seal leakage pressure and the steam leakage quantity of the fifth steam seal pipeline;
preferably, the gland cooler unit comprises: the steam seal cooler, the cooling water inlet pipeline, the cooling water outlet pipeline and the drainage pipeline;
the steam seal cooler is respectively connected with the cooling water inlet pipeline and the cooling water outlet pipeline;
the outlet end of the steam seal main pipe is communicated with the inlet of the steam seal cooler;
the outlet of the steam seal cooler is connected with one end of the drain pipe;
the other end of the drainage pipeline is connected with a drainage flash tank.
Preferably, an exhaust pipeline is further connected to the steam seal cooler for exhausting uncondensed gas;
one or more exhaust fans are arranged at the exhaust port of the exhaust pipeline;
the exhaust fan can keep a certain micro negative pressure in the steam seal cooler;
preferably, the outlets of the exhaust fans are provided with check valves.
The steam seal cooler drain pipe is of a U-shaped pipe structure.
(III) advantageous effects
The invention has the beneficial effects that: the steam seal system of the back pressure steam turbine provided by the invention has the following beneficial effects:
for the front and rear shaft seal steam leakage of a backpressure unit with higher backpressure, a steam seal at the shaft end passes through a steam throttling device on a shaft seal steam leakage pipeline, sectional pressure reduction measures are taken for the shaft seal to control the pressure of the front two sections of steam leakage, finally, the steam leakage amount of each section of steam seal is effectively controlled, each section of steam seal steam leakage is converged into a steam seal main pipe and discharged into a steam seal cooler, and the steam seal steam leakage of each section of steam seal is not required to be introduced into steam pipelines or equipment with different pressures. This simplifies the gland piping system and reduces the associated equipment for gland leakage.
Drawings
Fig. 1 is a schematic structural diagram of a gland sealing system of a back pressure turbine provided by the invention.
[ description of reference ]
1: a back press; 2: a first gland line; 3: a second gland line; 4: a third gland line; 5: a fourth gland line; 6: a fifth gland line; 7: a sixth gland line; 8: a steam throttling device; 9: a steam throttling device; 10: a steam throttling device; 11: a steam throttling device; 12: sealing the main pipe by steam; 23: a gland seal cooler; 24: a cooling water inlet pipe; 25: a cooling water outlet pipe; 26: an exhaust duct; 27: an exhaust fan; 28: an exhaust fan; 29: a hydrophobic pipeline.
Detailed Description
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings.
As shown in fig. 1: the embodiment discloses a gland sealing system of back pressure steam turbine includes: the device comprises a back press 1, a steam seal steam leakage unit and a steam seal cooler unit.
The steam seal steam leakage unit is connected with the back press 1 and can transmit the steam seal steam leakage discharged from the back press 1 to the steam seal cooler unit for condensation to obtain liquid water.
The steam seal cooler unit can condense steam seal leakage steam to obtain liquid water which is discharged into the drainage flash tank.
In this embodiment the gland sealing steam leakage unit includes: the high-pressure shaft end steam seal pipeline group, the low-pressure shaft end steam seal pipeline group and the steam seal main pipe 12; one end of the high-pressure shaft end steam seal pipeline group is communicated with the high-pressure shaft end of the back press 1; one end of the low-pressure shaft end steam seal pipeline group is communicated with the low-pressure shaft end of the back press 1; the other end of the high-pressure shaft end steam seal pipeline group is communicated with the inlet end of the steam seal main pipe 12; the other end of the low-pressure shaft end steam seal pipeline group is communicated with the inlet end of the steam seal main pipe 12; the outlet end of the gland sealing main pipe 12 is communicated with the gland sealing cooler unit.
In this embodiment the high pressure axle head gland seal pipe group includes: a first gland sealing pipeline 2, a second gland sealing pipeline 3 and a third gland sealing pipeline 4; the low pressure axle head gland seal pipeline group includes: a fourth gland line 5, a fifth gland line 6 and a sixth gland line 7; the first gland sealing pipeline 2, the second gland sealing pipeline 3, the fourth gland sealing pipeline 5 and the fifth gland sealing pipeline 6 are all connected with steam throttling devices 8-11.
The gland seal cooler unit comprises: a steam seal cooler 23, a cooling water inlet pipeline 24, a cooling water outlet pipeline 25 and a drain pipeline 29; the gland seal cooler 23 is respectively connected with the cooling water inlet pipeline 24 and the cooling water outlet pipeline 25; the outlet end of the steam seal main pipe 12 is communicated with the inlet of the steam seal cooler 23; the outlet of the steam seal cooler 23 is connected with one end of the drain pipe 29; the other end of the drain pipe 29 is connected with a drain flash tank.
In this embodiment, the gland cooler 23 is further connected to an exhaust pipe 26 for exhausting non-condensed gas; one or more exhaust fans 27-28 are arranged at the exhaust port of the exhaust pipeline 26; the exhaust fans 27-28 can keep a certain micro negative pressure inside the gland seal cooler 23; and check valves are arranged at the outlets of the exhaust fans 27-28.
The steam seal system of back pressure steam turbine that discloses in this embodiment includes: the device comprises a back press 1, a steam seal pipeline, steam throttling devices 9-11, a steam seal main pipe 12, a steam seal cooler 23, a cooling water pipeline, an exhaust pipeline 26, exhaust fans 27-28 and a drain pipeline 29.
The steam seal leakage steam is discharged from the front shaft end and the rear shaft end of the back pressure machine through a steam seal pipeline of the shaft seal section, is decompressed through a steam throttling device and then is connected to a steam seal main pipe. Thus, the front and rear shaft seals are divided into three sections of different pressure sections to leak steam, the steam leakage amount of each section is gradually reduced section by section, the steam leakage pressure and the steam leakage amount of the last section are effectively controlled, and the steam is prevented from leaking outwards.
The steam seal main pipe 12 is connected with a steam seal cooler 23, and steam seal leakage steam (steam and air mixed steam) is discharged into the steam seal cooler 23 to be cooled. The pressure of the steam seal steam leakage main pipe is consistent with the pressure of the last steam leakage section and is micro negative pressure, and the micro negative pressure is maintained by an air exhaust fan of the steam seal cooler 23.
The outlet of the steam seal cooler 23 is drained into a drainage flash tank.
In detail, when the backpressure unit normally operates, high-temperature and high-pressure steam of the front shaft seal is pumped out to the steam seal main pipe through the first section of steam seal steam leakage pipeline and the second section of steam seal steam leakage pipeline, the pressure of the first section of steam seal steam leakage is controlled within a certain range through a steam throttling device on the first section of steam seal pipeline, and the steam leakage amount of the first section of steam seal is controlled. And the steam throttling device on the second section of steam seal pipeline controls the steam leakage pressure of the second section of steam seal in a micro-positive pressure range and controls the steam leakage quantity of the second section of steam seal. The first and second sections of leaking steam are connected to the steam seal leaking main pipe after the pressure is reduced.
The third section of steam leakage port is a suction port of the steam seal system, the interface is in a micro negative pressure state, and the steam leakage from the second section and the air outside the shaft end are sucked into the steam seal pipeline through the steam seal orifice.
In detail, when the backpressure unit normally operates, high-temperature and high-pressure steam of the rear shaft seal is pumped out to the steam seal main pipe through the fourth steam seal steam leakage pipeline and the fifth steam seal steam leakage pipeline, the pressure of the fourth steam seal steam leakage is controlled within a certain range through a steam throttling device on the fourth steam seal pipeline, and the steam leakage amount of the fourth steam seal is controlled. And the steam throttling device on the fifth section of steam seal pipeline controls the steam leakage pressure of the fifth section of steam seal in a micro-positive pressure range and controls the steam leakage amount of the fifth section of steam seal. And the fourth and fifth sections of leaking steam are connected to the steam seal leaking steam main pipe after the pressure of the leaking steam is reduced.
And the sixth section of steam leakage port is a suction port of the steam seal system, the interface is in a micro negative pressure state, and the steam leakage from the fifth section and the air outside the shaft end are sucked into the steam seal pipeline through the steam seal orifice.
The steam seal main pipe 12 is connected with a steam seal cooler 23, so that the steam seal main pipe 12 forms micro negative pressure. The steam seal leakage steam in the steam seal main pipe 12 is totally fed into the steam seal cooler 23 to be condensed into water.
The gland cooler 23 is hydrophobically connected to a hydrophobic flash tank.
The technical principles of the present invention have been described above in connection with specific embodiments, which are intended to explain the principles of the present invention and should not be construed as limiting the scope of the present invention in any way. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive efforts, which shall fall within the scope of the present invention.
Claims (8)
1. A gland sealing system for a back pressure turbine, comprising: the device comprises a back press, a steam seal steam leakage unit and a steam seal cooler unit;
the steam seal steam leakage unit is connected with the backpressure machine and can transmit the steam seal steam leakage discharged from the backpressure machine to the steam seal cooler unit for condensation to obtain liquid water;
the steam seal cooler unit can condense steam seal leakage steam to obtain liquid water which is discharged into the drainage flash tank.
2. The gland sealing system of a back pressure turbine according to claim 1,
the gland sealing steam leakage unit comprises: the high-pressure shaft end steam seal pipeline group, the low-pressure shaft end steam seal pipeline group and the steam seal main pipe are arranged in the high-pressure shaft end steam seal pipeline group;
one end of the high-pressure shaft end steam seal pipeline group is communicated with the high-pressure shaft end of the back press;
one end of the low-pressure shaft end steam seal pipeline group is communicated with a low-pressure shaft end of the back press;
the other end of the high-pressure shaft end steam seal pipeline group is communicated with the inlet end of the steam seal main pipe;
the other end of the low-pressure shaft end steam seal pipeline group is communicated with the inlet end of the steam seal main pipe;
the outlet end of the steam seal main pipe is communicated with the steam seal cooler unit.
3. The gland sealing system of a back pressure turbine according to claim 2,
the high-pressure shaft end steam seal pipeline group comprises: a first gland sealing pipeline, a second gland sealing pipeline and a third gland sealing pipeline;
the low pressure axle head gland seal pipeline group includes: a fourth gland seal pipeline, a fifth gland seal pipeline and a sixth gland seal pipeline;
the first steam seal pipeline, the second steam seal pipeline, the fourth steam seal pipeline and the fifth steam seal pipeline are all provided with steam throttling devices.
4. The gland sealing system of a back pressure turbine according to claim 3,
the steam throttling device on the first steam seal pipeline can control the steam seal leakage pressure and the steam leakage quantity of the first steam seal pipeline;
and the steam throttling device positioned on the second steam seal pipeline can control the steam seal leakage pressure and the steam leakage quantity of the second steam seal pipeline.
5. The gland sealing system of a back pressure turbine according to claim 4,
the steam throttling device on the fourth steam seal pipeline can control the steam seal leakage pressure and the steam leakage quantity of the fourth steam seal pipeline;
and the steam throttling device positioned on the fifth steam seal pipeline can control the steam seal leakage pressure and the steam leakage quantity of the fifth steam seal pipeline.
6. The gland sealing system of a back pressure turbine according to claim 5,
the gland seal cooler unit comprises: the steam seal cooler, the cooling water inlet pipeline, the cooling water outlet pipeline and the drainage pipeline;
the steam seal cooler is respectively connected with the cooling water inlet pipeline and the cooling water outlet pipeline;
the outlet end of the steam seal main pipe is communicated with the inlet of the steam seal cooler;
the outlet of the steam seal cooler is connected with one end of the drain pipe;
the other end of the drainage pipeline is connected with a drainage flash tank.
7. The gland sealing system of a back pressure turbine according to claim 6,
the steam seal cooler is also connected with an exhaust pipeline for exhausting uncondensed gas;
one or more exhaust fans are arranged at the exhaust port of the exhaust pipeline;
the exhaust fan can keep a certain micro negative pressure in the steam seal cooler.
8. The gland sealing system of a back pressure turbine according to claim 7,
and check valves are arranged at the outlets of the exhaust fans.
The steam seal cooler drain pipe is of a U-shaped pipe structure.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202110068777.1A CN112879105A (en) | 2021-01-19 | 2021-01-19 | Steam sealing system of back pressure steam turbine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202110068777.1A CN112879105A (en) | 2021-01-19 | 2021-01-19 | Steam sealing system of back pressure steam turbine |
Publications (1)
Publication Number | Publication Date |
---|---|
CN112879105A true CN112879105A (en) | 2021-06-01 |
Family
ID=76049645
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN202110068777.1A Pending CN112879105A (en) | 2021-01-19 | 2021-01-19 | Steam sealing system of back pressure steam turbine |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN112879105A (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58104305A (en) * | 1981-12-15 | 1983-06-21 | Toshiba Corp | Leakage steam disposal system of steam turbine shaft sealing section |
JPH10103018A (en) * | 1996-10-01 | 1998-04-21 | Fuji Electric Co Ltd | Gland shaft seal device for back pressure steam turbine |
CN202991153U (en) * | 2012-12-24 | 2013-06-12 | 昆明醋酸纤维有限公司 | Device for extracting rear steam sealing leakage of back pressure turbine |
CN208330471U (en) * | 2018-06-22 | 2019-01-04 | 福州和特新能源有限公司 | A kind of back pressure unit gland packing leakage recyclable device |
CN210396829U (en) * | 2019-06-05 | 2020-04-24 | 陕西渭河发电有限公司 | Novel steam turbine shaft seal cooler system |
-
2021
- 2021-01-19 CN CN202110068777.1A patent/CN112879105A/en active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58104305A (en) * | 1981-12-15 | 1983-06-21 | Toshiba Corp | Leakage steam disposal system of steam turbine shaft sealing section |
JPH10103018A (en) * | 1996-10-01 | 1998-04-21 | Fuji Electric Co Ltd | Gland shaft seal device for back pressure steam turbine |
CN202991153U (en) * | 2012-12-24 | 2013-06-12 | 昆明醋酸纤维有限公司 | Device for extracting rear steam sealing leakage of back pressure turbine |
CN208330471U (en) * | 2018-06-22 | 2019-01-04 | 福州和特新能源有限公司 | A kind of back pressure unit gland packing leakage recyclable device |
CN210396829U (en) * | 2019-06-05 | 2020-04-24 | 陕西渭河发电有限公司 | Novel steam turbine shaft seal cooler system |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN110500148B (en) | High-back-pressure heat supply and monitoring method and system for large steam turbine generator unit | |
JP3245469U (en) | Energy-saving and safe steam turbine shaft sealed exhaust steam system | |
CN201671660U (en) | Steam turbine with steam extraction being changed into back pressure type | |
CN203420744U (en) | Shaft seal heater | |
CN214741485U (en) | Steam sealing system of back pressure steam turbine | |
CN203772051U (en) | Multistage steam ejector vacuum-pumping system of double backpressure condensers | |
CN112879105A (en) | Steam sealing system of back pressure steam turbine | |
CN108561190B (en) | Shaft seal system of steam turbine | |
CN208578589U (en) | A kind of steam turbine gland system of overflow heat recovery cascade utilization | |
CN200993028Y (en) | Steam turbine low-pressure shaft seal water-sealing system | |
CN212671880U (en) | 200MW ultrahigh-pressure three-cylinder three-exhaust back pressure modified steam turbine | |
CN105865219B (en) | Multistage heat pressing type pumped vacuum systems | |
CN208578591U (en) | A kind of gland seal system improving starting efficiency | |
CN211924258U (en) | Energy-saving and efficient steam seal steam supply system of steam turbine | |
CN216767483U (en) | Improve bearing seal system of steam turbine low pressure jar vacuum tightness | |
CN218624340U (en) | Steam turbine shaft seal leakage recovery device | |
CN215979843U (en) | Mechanical seal self-cooling device of condensate pump | |
CN206670398U (en) | Condenser of power plant vacuumizes operation maintenance system | |
CN105973023B (en) | Low plus axle adds grade backheat heat pressing type pumped vacuum systems and its an adjusting method | |
CN218624343U (en) | Shaft seal heat regenerative system of million ultra-supercritical unit | |
CN220185190U (en) | Energy-saving and safe steam turbine shaft seal steam exhaust system | |
CN217898313U (en) | Device for realizing secondary development and energy conservation of steam ejector | |
CN202954859U (en) | Steam seal heater | |
CN212177233U (en) | Saturated steam power generation vacuum system | |
CN204705218U (en) | A kind of equipment improving water jet system efficiency and condenser vacuum |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PB01 | Publication | ||
PB01 | Publication | ||
SE01 | Entry into force of request for substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210601 |
|
RJ01 | Rejection of invention patent application after publication |