CN214741485U - Steam sealing system of back pressure steam turbine - Google Patents
Steam sealing system of back pressure steam turbine Download PDFInfo
- Publication number
- CN214741485U CN214741485U CN202120139816.8U CN202120139816U CN214741485U CN 214741485 U CN214741485 U CN 214741485U CN 202120139816 U CN202120139816 U CN 202120139816U CN 214741485 U CN214741485 U CN 214741485U
- Authority
- CN
- China
- Prior art keywords
- steam
- pipeline
- steam seal
- 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.)
- Active
Links
Images
Landscapes
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
The utility model relates to a vapor seal system of back pressure steam turbine, include: 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 utility model provides a gland sealing system can solve the going problem of steam turbine gland leak effectively, and makes the gland sealing system reach fine steam sealing effect, and makes the relevant designing requirement that the steam turbine gland sealing system can simplify and satisfy the gland sealing system.
Description
Technical Field
The utility model belongs to the technical field of the steam turbine power generation, especially, relate to a vapor seal system of 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.
SUMMERY OF THE UTILITY MODEL
Technical problem to be solved
In order to solve the above-mentioned problem of the prior art, the utility model provides a gland sealing system of back pressure steam turbine, this system can solve the going problem of steam turbine gland leak steam effectively, and make the gland sealing system reach fine steam sealing effect, and make the steam turbine gland sealing system can simplify and satisfy the relevant designing requirement of gland sealing system.
(II) technical scheme
In order to achieve the above object, the utility model discloses a main technical scheme include:
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;
the steam seal steam leakage unit comprises a steam seal main pipe;
the inlet end of the steam seal main pipe is connected with a valve rod air leakage device;
the valve rod air leakage device is also connected with a steam pipeline.
Preferably, the gland sealing steam leakage unit further comprises: the high-pressure shaft end steam seal pipeline group and the low-pressure shaft end steam seal pipeline group are arranged in the shaft;
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 utility model has the advantages that: the utility model provides a pair of vapor seal system of back pressure steam turbine has following beneficial effect:
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 view of a steam seal system of a back pressure turbine provided by the present 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 a better understanding of the present invention, reference will now be made in detail to the present invention, examples of which are illustrated in 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 further includes: the high-pressure shaft end steam seal pipeline group and the low-pressure shaft end steam seal pipeline group are arranged in the shaft; 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. The steam seal steam leakage unit comprises a steam seal main pipe; the inlet end of the steam seal main pipe is connected with a valve rod air leakage device; the valve rod air leakage device is also connected with a steam pipeline
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 with reference to specific embodiments, which are intended to explain the principles of the present invention and should not be interpreted 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 any inventive effort, which would 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;
the steam seal steam leakage unit comprises a steam seal main pipe;
the inlet end of the steam seal main pipe is connected with a valve rod air leakage device;
the valve rod air leakage device is also connected with a steam pipeline.
2. The gland sealing system of a back pressure turbine according to claim 1,
the gland sealing steam leakage unit further comprises: the high-pressure shaft end steam seal pipeline group and the low-pressure shaft end steam seal pipeline group are arranged in the shaft;
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 the interior of the steam seal cooler at a slight negative pressure.
8. The gland sealing system of a back pressure turbine according to claim 7,
check valves are arranged at the outlets of the exhaust fans;
the drain pipe of the steam seal cooler is of a U-shaped pipe structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120139816.8U CN214741485U (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 |
|---|---|---|---|
| CN202120139816.8U CN214741485U (en) | 2021-01-19 | 2021-01-19 | Steam sealing system of back pressure steam turbine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214741485U true CN214741485U (en) | 2021-11-16 |
Family
ID=78639431
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120139816.8U Active CN214741485U (en) | 2021-01-19 | 2021-01-19 | Steam sealing system of back pressure steam turbine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214741485U (en) |
-
2021
- 2021-01-19 CN CN202120139816.8U patent/CN214741485U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203420744U (en) | Shaft seal heater | |
| JP3245469U (en) | Energy-saving and safe steam turbine shaft sealed exhaust steam system | |
| CN214741485U (en) | Steam sealing system of back pressure steam turbine | |
| CN108204256B (en) | System for eliminating blowing loss and realizing zero steam admission of low-pressure cylinder and working method thereof | |
| CN203772051U (en) | Multistage steam ejector vacuum-pumping system of double backpressure condensers | |
| CN108561190B (en) | Shaft seal system of steam turbine | |
| CN112879105A (en) | Steam sealing system of back pressure steam turbine | |
| CN208578589U (en) | A kind of steam turbine gland system of overflow heat recovery cascade utilization | |
| CN207004587U (en) | The double back pressure systems of steam feed pump | |
| CN212671880U (en) | 200MW ultrahigh-pressure three-cylinder three-exhaust back pressure modified steam turbine | |
| CN105865219B (en) | Multistage heat pressing type pumped vacuum systems | |
| CN201982145U (en) | Shaft seal system of extraction condensing or condensing turbine | |
| CN200993028Y (en) | Steam turbine low-pressure shaft seal water-sealing system | |
| CN208578591U (en) | A kind of gland seal system improving starting efficiency | |
| CN107355267A (en) | The double back pressure systems of steam feed pump and its control method | |
| CN208416621U (en) | Low pressure (LP) cylinder gland seal system, steam turbine and turbine LP rotors | |
| CN216767483U (en) | Improve bearing seal system of steam turbine low pressure jar vacuum tightness | |
| CN105973023B (en) | Low plus axle adds grade backheat heat pressing type pumped vacuum systems and its an adjusting method | |
| CN212177233U (en) | Saturated steam power generation vacuum system | |
| CN215979843U (en) | Mechanical seal self-cooling device of condensate pump | |
| CN218624340U (en) | Steam turbine shaft seal leakage recovery device | |
| CN218624343U (en) | Shaft seal heat regenerative system of million ultra-supercritical unit | |
| CN212177232U (en) | Multistage water seal for saturated steam power generation vacuum system | |
| CN216008621U (en) | Take bypass regulatory function's vapour engine axle to add hydrophobic water seal section of thick bamboo | |
| CN217898313U (en) | Device for realizing secondary development and energy conservation of steam ejector |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |