CN216841844U - Steam turbine shaft seal heater drainage system - Google Patents
Steam turbine shaft seal heater drainage system Download PDFInfo
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- CN216841844U CN216841844U CN202220708136.8U CN202220708136U CN216841844U CN 216841844 U CN216841844 U CN 216841844U CN 202220708136 U CN202220708136 U CN 202220708136U CN 216841844 U CN216841844 U CN 216841844U
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- pressure sensor
- steam turbine
- drainage system
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Abstract
The utility model discloses a steam turbine bearing seal heater drainage system, include: a shaft seal heater, a low-pressure heater and a condenser; the shaft seal heater is connected with a first-stage water seal, the other end of the first-stage water seal is connected with a first electric valve, and the other end of the first electric valve is connected with the condenser through a third connecting pipe and is also connected with the other end of the bypass valve; the second-stage water seal is connected with a third connecting pipe through a second electric valve; the shaft seal heater is connected with a first pressure sensor, the low-pressure heater is connected with a second pressure sensor, the condenser is connected with a third pressure sensor, the first pressure sensor, the second pressure sensor and the third pressure sensor are all electrically connected with a controller, and the first electric valve and the second electric valve are electrically connected with the controller. The utility model discloses effectively avoided steam-water concurrent flow, hydrophobic not smooth situation to appear in steam turbine bearing seal heater drainage system, ensured high-efficient, the safe operation of steam turbine.
Description
Technical Field
The utility model belongs to the technical field of the electricity generation, especially, relate to a steam turbine bearing seal heater drainage system.
Background
The shaft seal heater is an important heat exchange equipment in the steam turbine shaft seal system, and condenser vacuum environment and extremely low operating pressure are considered to traditional shaft seal heater's drainage system, often use multistage water seal U-shaped pipe to carry out soda isolation, and in my company's generating set's drainage system, shaft seal heater's rivers are through I level U type water seal, then through II level U type water seals after converging with the rivers of low pressure heating gas, carry the condenser in again. In actual operation, the situations that drainage of a II-grade U-shaped water seal is not smooth and a low-pressure heater is full of water often occur, so that water flow of the low-pressure heater is directly discharged to a condenser through a bypass, the situation is very easy to generate a low water level state, a steam-water co-flow phenomenon is formed in a drainage system, drainage is not smooth, the operation efficiency of a generator set is reduced, and meanwhile, the safety risk of operation is increased.
SUMMERY OF THE UTILITY MODEL
First, technical problem to be solved
The utility model provides a steam turbine bearing seal heater drainage system, its aim at: the conditions of steam-water co-flow and unsmooth drainage of a steam turbine shaft seal heater drainage system are avoided, and efficient and safe operation of the steam turbine is guaranteed.
Second, technical scheme
The utility model discloses a following technical scheme, include:
the low-pressure heater is connected with the secondary water seal through a first connecting pipe and is connected with the condenser through a fourth connecting pipe; the shaft seal heater is connected with the bypass valve through a second connecting pipe and is connected with the primary water seal through a first control valve, the other end of the primary water seal is connected with the first electric valve, and the other end of the first electric valve is connected with the condenser through a third connecting pipe and is simultaneously connected with the other end of the bypass valve; the second-stage water seal is connected with a third connecting pipe through a second electric valve; the shaft seal heater is connected with a first pressure sensor, the low-pressure heater is connected with a second pressure sensor, the condenser is connected with a third pressure sensor, the first pressure sensor, the second pressure sensor and the third pressure sensor are all electrically connected with a controller, and the first electric valve and the second electric valve are electrically connected with the controller.
Preferably, the first-stage water seal is a six-group U-shaped water seal, and the second-stage water seal is a three-group U-shaped water seal.
Preferably, the controller is a PLC programmable controller.
Furthermore, the first connecting pipe is connected in series with the second control valve, and the fourth connecting pipe is connected in series with the third control valve.
Furthermore, the primary water seal, the secondary water seal and the low-pressure heater are all connected with a water drain valve.
Third, beneficial effect
The utility model relates to a steam turbine bearing seal heater drainage system has effectively avoided steam-water to flow altogether, the hydrophobic situation that is not smooth in steam turbine bearing seal heater drainage system appearance, has ensured high-efficient, the safe operation of steam turbine, has reduced fuel consumption, has improved production efficiency, has ensured safety in production.
Drawings
Fig. 1 is a schematic structural view of a steam turbine shaft seal heater drainage system of the present invention.
FIG. 2 is a schematic structural diagram of a drainage system of a shaft seal heater of a primary turbine.
Detailed Description
In order to make the present invention more clear to those skilled in the art, a brief description of the original steam turbine shaft seal heater drainage system will be provided.
As shown in fig. 2, in the drainage system of the original steam turbine shaft seal heater, water flow in the shaft seal heater 31 enters a primary U-shaped water seal 33, and water flow flowing out of the primary U-shaped water seal is merged with water flow from a low-pressure heating gas 32 and then conveyed to a condenser 35 through a secondary U-shaped water seal 34. In actual operation, the situation that the drainage of the two-stage U-shaped water seal is not smooth and the low-pressure heater is full of water often occurs in the structure, so that water flow of the low-pressure heater is directly discharged to the condenser through the bypass pipe 36, and a steam-water coexistence phenomenon is formed in a drainage system to cause the drainage to be not smooth.
The present invention will be described in further detail with reference to the accompanying drawings, as shown in fig. 1, the present invention includes:
the system comprises a shaft seal heater 1 and a low-pressure heater 2, wherein the low-pressure heater is connected with a secondary water seal 4 through a first connecting pipe 3 and is connected with a condenser 10 through a fourth connecting pipe 18; the shaft seal heater is connected with a bypass valve 6 through a second connecting pipe 5 and is connected with a primary water seal 8 through a first control valve 7, the other end of the primary water seal is connected with a first electric valve 9, and the other end of the first electric valve is connected with a condenser 10 through a third connecting pipe 15 and is also connected with the other end of the bypass valve; the secondary water seal is connected with a third connecting pipe through a second electric valve 11; the shaft seal heater is connected with a first pressure sensor 12, the low-pressure heater is connected with a second pressure sensor 13, the condenser is connected with a third pressure sensor 20, the first pressure sensor, the second pressure sensor and the third pressure sensor are all electrically connected with a controller 14, and the first electric valve and the second electric valve are electrically connected with the controller.
Preferably, the first-stage water seal is a six-group U-shaped water seal, and the second-stage water seal is a three-group U-shaped water seal.
Preferably, the controller is a PLC programmable controller.
Furthermore, the first connection pipe is connected in series with the second control valve 16, and the fourth connection pipe is connected in series with the third control valve 19.
Furthermore, the primary water seal, the secondary water seal and the low-pressure heater are all connected with a water drain valve 17.
The utility model discloses a working process:
the utility model discloses change original mixed hydrophobic scheme into the bearing seal heater and cooperate with the one-level water seal, low pressure heating gas cooperatees with the second grade water seal, and independent each other carries out hydrophobic.
In the drainage process, the first pressure sensor transmits a real-time absolute pressure value of the shaft seal heater to the controller, the second pressure sensor transmits a real-time absolute pressure value of the low-pressure heater to the controller, the third pressure sensor transmits a real-time absolute pressure value of the condenser to the controller, in a normal drainage state, the absolute pressure value of the shaft seal heater is 0.09-0.095 Mpa, the absolute pressure value of the low-pressure heater is 0.025-0.03 Mpa, the absolute pressure value of the condenser is 0.008Mpa, when the absolute pressure value of the shaft seal heater is reduced, and the pressure difference between the shaft seal heater and the condenser is reduced, the controller controls the first electric valve to reduce the opening degree of the first electric valve, so that the co-flow of steam and water in the primary water seal is prevented; similarly, when the absolute pressure value of the low-pressure heater is reduced and the pressure difference between the low-pressure heater and the condenser is reduced, the controller controls the second electric valve to reduce the opening degree of the second electric valve so as to prevent the co-flow of steam and water in the secondary water seal; the controller may also control the first electrically operated valve to increase the opening degree thereof to decrease the pressure difference between the shaft seal heater and the condenser, and similarly, the controller may control the second electrically operated valve to increase the opening degree thereof to decrease the pressure difference between the low pressure heater and the condenser, thereby adjusting the drainage state.
The bypass valve and the first control valve are arranged for closing the first control valve and the first electric valve when the primary water seal is overhauled, so that the overhauling work is facilitated; the bypass valve is opened without cutting off the water flow drained by the shaft seal heater.
The utility model relates to a steam turbine bearing seal heater drainage system has effectively avoided steam-water to flow altogether, the hydrophobic situation that is not smooth in steam turbine bearing seal heater drainage system, has ensured high-efficient, the safe operation of steam turbine, has reduced fuel consumption, has improved production efficiency, has promoted safety in production.
Claims (5)
1. A drainage system of a steam turbine shaft seal heater comprises a shaft seal heater (1) and a low-pressure heater (2), wherein the low-pressure heater is connected with a secondary water seal (4) through a first connecting pipe (3) and is connected with a condenser (10) through a fourth connecting pipe (18); the method is characterized in that: the shaft seal heater is connected with a bypass valve (6) through a second connecting pipe (5) and is connected with a primary water seal (8) through a first control valve (7), the other end of the primary water seal is connected with a first electric valve (9), and the other end of the first electric valve is connected with a condenser (10) through a third connecting pipe (15) and is also connected with the other end of the bypass valve; the secondary water seal is connected with a third connecting pipe through a second electric valve (11); the shaft seal heater is connected with a first pressure sensor (12), the low-pressure heater is connected with a second pressure sensor (13), the condenser is connected with a third pressure sensor (20), the first pressure sensor, the second pressure sensor and the third pressure sensor are all electrically connected with a controller (14), and the first electric valve and the second electric valve are electrically connected with the controller.
2. The steam turbine gland seal heater drainage system of claim 1 wherein: the first-stage water seal is a six-group U-shaped water seal, and the second-stage water seal is a three-group U-shaped water seal.
3. The steam turbine gland seal heater drainage system according to claim 1 or 2, wherein: the controller is a PLC programmable controller.
4. The steam turbine gland seal heater drainage system of claim 3 wherein: the first connecting pipe is connected in series with a second control valve (16), and the fourth connecting pipe is connected in series with a third control valve (19).
5. The steam turbine gland seal heater drainage system of claim 4 wherein: the primary water seal, the secondary water seal and the low-pressure heater are all connected with a water drain valve (17).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220708136.8U CN216841844U (en) | 2022-03-28 | 2022-03-28 | Steam turbine shaft seal heater drainage system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220708136.8U CN216841844U (en) | 2022-03-28 | 2022-03-28 | Steam turbine shaft seal heater drainage system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216841844U true CN216841844U (en) | 2022-06-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220708136.8U Active CN216841844U (en) | 2022-03-28 | 2022-03-28 | Steam turbine shaft seal heater drainage system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216841844U (en) |
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2022
- 2022-03-28 CN CN202220708136.8U patent/CN216841844U/en active Active
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