CN216811792U - Steam turbine vacuum seal system - Google Patents
Steam turbine vacuum seal system Download PDFInfo
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- CN216811792U CN216811792U CN202220156057.0U CN202220156057U CN216811792U CN 216811792 U CN216811792 U CN 216811792U CN 202220156057 U CN202220156057 U CN 202220156057U CN 216811792 U CN216811792 U CN 216811792U
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- pressure
- pipe
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- reheating
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- 238000003303 reheating Methods 0.000 claims abstract description 41
- 230000001105 regulatory effect Effects 0.000 claims abstract description 22
- 238000007789 sealing Methods 0.000 claims abstract description 19
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- 229910002804 graphite Inorganic materials 0.000 claims description 2
- 239000010439 graphite Substances 0.000 claims description 2
- 238000012856 packing Methods 0.000 claims description 2
- 238000012423 maintenance Methods 0.000 abstract description 2
- 241000283216 Phocidae Species 0.000 description 15
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910000734 martensite Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
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Abstract
The utility model discloses a steam turbine vacuum sealing system, which comprises sealing pipes arranged on a medium-pressure reheating regulating pipe, a medium-pressure reheating steam pipe, a high-pressure reheating regulating pipe, a high-pressure reheating steam pipe, an ultrahigh-pressure main steam pipe and an ultrahigh-pressure regulating pipe; and the sealing pipes on the medium-pressure reheating adjusting pipe, the medium-pressure reheating steam pipe, the high-pressure reheating adjusting pipe, the high-pressure reheating steam pipe, the ultrahigh-pressure main steam pipe and the ultrahigh-pressure adjusting pipe are all provided with stop valves. According to the utility model, the electric stop valve is additionally arranged on the pipeline from the steam leakage of the door rod of the vacuum system to the condenser, so that the problem of poor vacuum tightness of the pipeline from the steam leakage of the door rod of the unit to the condenser is solved, the tightness of the vacuum system is ensured, the maintenance cost is reduced, and the safety and the reliability of equipment are improved.
Description
Technical Field
The utility model relates to the technical field of steam turbine equipment, in particular to a vacuum sealing system of a steam turbine.
Background
The steam supply of the shaft seal of the power plant usually adopts auxiliary steam as a steam supply source of the shaft seal, can meet the steam supply temperature requirements of starting the rear shaft seal of the high pressure cylinder and the rear shaft seal of the intermediate pressure cylinder in a thermal state and an extreme thermal state, but can not meet the high-temperature steam supply requirements of the front shaft seal of the high-pressure cylinder and the front shaft seal of the medium-pressure cylinder, when the conventional unit is started in a hot state or an extremely hot state, the steam supply of the main steam station or the addition of an electric heater at the auxiliary steam station is mainly relied on to provide a high-temperature steam source, which has the advantages of simple system, but only one steam supply temperature can be provided for each steam seal of the high and medium pressure cylinders, and independent temperature matching can not be carried out on the front shaft seal of the high and medium pressure cylinders and the rear shaft seal of the high and medium pressure cylinders, according to the conventional scheme of supplying steam at the main steam station or adding an electric heater at the auxiliary steam station, the problem that the steam supply temperature of the shaft seal is not matched with the temperature of the rotor is still outstanding, and the problem that the temperature of the rotor is matched with the temperature of the steam supply of the shaft seal cannot be solved fundamentally.
Disclose a self-adaptation bearing seal steam supply system in patent CN201910729582.X, including the female pipe of bearing seal, door pole gas leakage is adjusted and is supplied vapour branch road, the overflow branch road, the pneumatic branch road of bypass, high pressure cylinder bearing seal, intermediate pressure cylinder bearing seal and low pressure cylinder bearing seal, the female pipe entry end of bearing seal is provided with supplementary steam control valve, the female pipe entry end of bearing seal is adjusted with door pole gas leakage respectively and is supplied vapour branch road, overflow branch road and the pneumatic branch road intercommunication of bypass, the female pipe exit end of bearing seal respectively with high pressure cylinder bearing seal back bearing seal, intermediate pressure cylinder bearing seal back bearing seal intercommunication. According to the self-adaptive shaft seal steam supply system provided by the utility model, when a unit is started, after steam supply fails, the pressure difference between two sides of the steam leakage check valve is increased, and the differential pressure transmitter closes the regulating valve of the steam supply branch for regulating the air leakage of the door lever so as to prevent the interruption of steam supply; when the self sealss operating mode, the bearing seal supplies vapour pressure to increase, and differential pressure transmitter opens door lever gas leakage and adjusts and supply vapour branch road governing valve, prevents that the bearing seal supplies vapour pipeline superpressure, adjusts steam temperature through supplementary steam control valve, increases the security and the anti fault capability of this system. However, during the operation of the unit, the opening degrees of the steam turbine valve and the valve rod of the regulating valve change along with the fluctuation of the load, when the valve is fully opened, the steam sealing surface of the valve is completely closed, the steam leakage amount of the valve rod is reduced, the self-sealing effect on the external air cannot be realized, the external air leaks into the condenser through the steam leakage pipeline of the valve rod, and the problem of vacuum leakage exists at different degrees at the positions of the valve and the valve rod of the regulating valve.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provides a vacuum sealing system of a steam turbine.
The purpose of the utility model is realized by the following technical scheme:
a steam turbine vacuum sealing system comprises sealing pipes arranged on a medium-pressure reheating adjusting pipe, a medium-pressure reheating steam pipe, a high-pressure reheating adjusting pipe, a high-pressure reheating steam pipe, an ultrahigh-pressure main steam pipe and an ultrahigh-pressure adjusting pipe; and the seal pipes on the medium-pressure reheating adjusting pipe, the medium-pressure reheating steam pipe, the high-pressure reheating adjusting pipe, the high-pressure reheating steam pipe, the ultrahigh-pressure main steam pipe and the ultrahigh-pressure adjusting pipe are all provided with stop valves.
Further, the stop valve is an electric stop valve.
Furthermore, a throttling pore plate and a graphite packing ring are filled in the sealing pipe.
Furthermore, the phi of the medium-pressure reheating adjusting pipe, the medium-pressure reheating steam pipe, the high-pressure reheating adjusting pipe and the high-pressure reheating steam pipe is 60 multiplied by 5.5mm, and the material is P92.
Furthermore, phi of the ultrahigh pressure main steam pipe and the ultrahigh pressure adjusting pipe is 73 multiplied by 5mm, and the material is P91.
The utility model has the beneficial effects that: the utility model solves the problem of poor vacuum tightness of the pipeline from the steam leakage of the machine set door rod to the condenser by additionally arranging the electric stop valve in the pipeline from the steam leakage of the vacuum system door rod to the condenser, ensures the tightness of the vacuum system, reduces the maintenance cost and improves the safety and the reliability of equipment.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a block diagram of one embodiment of the system of the present invention.
Fig. 2 is a side view of fig. 1.
Fig. 3 is a bottom view of fig. 1.
Description of the drawings: 100-medium pressure reheat regulation pipe; 200-medium pressure reheating steam pipe; 300-high pressure reheat regulation pipe; 400-high pressure reheat steam pipe; 500-ultrahigh pressure main steam pipe; 600-an ultrahigh pressure regulating pipe; 101. 201, 301, 401, 501, 601-stop valve; 102. 202, 302, 402, 502, 602-sealed tube.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In this embodiment, as shown in fig. 1, 2 and 3, a vacuum sealing system for a steam turbine includes sealing pipes disposed on a wrapping medium-pressure reheating regulating pipe 100, a medium-pressure reheating steam pipe 200, a high-pressure reheating regulating pipe 300, a high-pressure reheating steam pipe 400, an ultrahigh-pressure main steam pipe 500 and an ultrahigh-pressure regulating pipe 600; and stop valves are arranged on the sealing pipes on the medium-pressure reheating regulating pipe 100, the medium-pressure reheating steam pipe 200, the high-pressure reheating regulating pipe 300, the high-pressure reheating steam pipe 400, the ultrahigh-pressure main steam pipe 500 and the ultrahigh-pressure regulating pipe 600.
In the present embodiment, the stop valves 101, 201, 301, 401, 501, and 601 are all electric stop valves.
In this embodiment, the sealing tube is filled.
In this embodiment, the medium-pressure reheat adjusting pipe, the medium-pressure reheat steam pipe, the high-pressure reheat adjusting pipe, and the high-pressure reheat steam pipe are 60 × 5.5, P92, and belong to the american-standard martensitic heat-resistant steel.
In the present embodiment, the ultrahigh-pressure main steam pipe and the ultrahigh-pressure adjusting pipe are 73 × 5, P91, and belong to the american-standard martensitic heat-resistant steel.
When the pressure of a pipeline before steam leakage of a steam turbine valve rod reaches an electric throttle valve of a condenser is higher than the set pressure by 1.2MPa, a pressure transmitter detects the pressure change of the valve and opens corresponding steam leakage electric stop valves of the valve rod in a linkage manner, so that medium-pressure, high-pressure and ultrahigh-pressure steam valves and pressure-holding steam bleeding at the regulating valve are avoided; when the pressure of the pipeline in front of the valve is lower than the set pressure by 1.2MPa, the pressure transmitter detects the pressure change of the valve, and the corresponding valve rod steam leakage electric stop valve is closed in a linkage manner, so that air is prevented from leaking into vacuum from valve rods at the positions of the steam valve and the regulating valve.
During the operation of the existing unit, the opening degrees of a steam valve and a valve rod of an adjusting valve of a steam turbine change along with the fluctuation of load, when the valve is fully opened, the steam sealing surface of the valve is completely closed, the steam leakage amount of the valve rod is reduced, the self-sealing effect on external air cannot be realized, and the external air leaks into a condenser through a steam leakage pipeline of the valve rod, so that the problem of vacuum leakage exists at the positions of the steam valve and the valve rod of the adjusting valve in different degrees; according to the utility model, the tightness of a vacuum system is ensured by adjusting the stop valves on the medium-pressure reheating adjusting pipe 100, the medium-pressure reheating steam pipe 200, the high-pressure reheating adjusting pipe 300, the high-pressure reheating steam 400, the ultrahigh-pressure main steam 500 and the ultrahigh-pressure adjusting pipe 600.
The structures, functions, and connections disclosed herein may be implemented in other ways. For example, the embodiments described above are merely illustrative, e.g., multiple components may be combined or integrated with another component; in addition, functional components in the embodiments herein may be integrated into one functional component, or each functional component may exist alone physically, or two or more functional components may be integrated into one functional component.
The foregoing is illustrative of the preferred embodiments of this invention, and it is to be understood that the utility model is not limited to the precise form disclosed herein and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the concept as disclosed herein, either as described above or as apparent to those skilled in the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the utility model as defined by the appended claims.
Claims (5)
1. A steam turbine vacuum sealing system is characterized by comprising sealing pipes arranged on a medium-pressure reheating regulating pipe (100), a medium-pressure reheating steam pipe (200), a high-pressure reheating regulating pipe (300), a high-pressure reheating steam pipe (400), an ultrahigh-pressure main steam pipe (500) and an ultrahigh-pressure regulating pipe (600); and stop valves are arranged on the sealing pipes on the medium-pressure reheating regulating pipe (100), the medium-pressure reheating steam pipe (200), the high-pressure reheating regulating pipe (300), the high-pressure reheating steam pipe (400), the ultrahigh-pressure main steam pipe (500) and the ultrahigh-pressure regulating pipe (600).
2. The steam turbine vacuum seal system of claim 1, wherein said shut-off valve is an electrically-actuated shut-off valve.
3. The steam turbine vacuum seal system of claim 1, wherein the seal tube is filled with a restriction orifice and a graphite packing ring.
4. The steam turbine vacuum seal system of claim 1, wherein the intermediate pressure reheat regulation pipe (100), the intermediate pressure reheat steam pipe (200), the high pressure reheat regulation pipe (300) and the high pressure reheat steam pipe (400) have a phi of 60 x 5.5mm and are made of P92.
5. The turbine vacuum seal system according to claim 1, wherein the ultra-high pressure main steam pipe (500) and the ultra-high pressure adjusting pipe (600) have a phi of 73 x 5mm and are made of P91.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220156057.0U CN216811792U (en) | 2022-01-20 | 2022-01-20 | Steam turbine vacuum seal system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220156057.0U CN216811792U (en) | 2022-01-20 | 2022-01-20 | Steam turbine vacuum seal system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216811792U true CN216811792U (en) | 2022-06-24 |
Family
ID=82065323
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220156057.0U Expired - Fee Related CN216811792U (en) | 2022-01-20 | 2022-01-20 | Steam turbine vacuum seal system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216811792U (en) |
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2022
- 2022-01-20 CN CN202220156057.0U patent/CN216811792U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20220624 |