CN216741648U - Shaft seal steam leakage device of ultrahigh pressure cylinder of steam turbine - Google Patents
Shaft seal steam leakage device of ultrahigh pressure cylinder of steam turbine Download PDFInfo
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- CN216741648U CN216741648U CN202220363864.XU CN202220363864U CN216741648U CN 216741648 U CN216741648 U CN 216741648U CN 202220363864 U CN202220363864 U CN 202220363864U CN 216741648 U CN216741648 U CN 216741648U
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- 238000003303 reheating Methods 0.000 claims abstract description 10
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
The utility model discloses a shaft seal steam leakage device of an ultra-high pressure cylinder of a steam turbine, which comprises a shaft seal heater, a high-pressure steam leakage pipeline for leaking steam from front and rear shaft ends of the ultra-high pressure cylinder to a low-temperature reheating steam pipeline, a medium-pressure steam leakage pipeline for leaking steam from the front and rear shaft ends of the ultra-high pressure cylinder to a medium-low pressure communicating pipe, and a low-pressure steam leakage pipeline for leaking steam from the front and rear shaft ends of the ultra-high pressure cylinder to the shaft seal heater, wherein a check valve is arranged on the high-pressure steam leakage pipeline, a plurality of temperature measuring points are arranged at the front and rear ends of the check valve, and a flow measuring device is arranged on the medium-pressure steam leakage pipeline. The check valve is arranged on the high-pressure steam leakage pipeline, so that the phenomenon that steam reversely flees to the ultrahigh pressure cylinder through the high-pressure steam leakage pipeline when the ultrahigh pressure cylinder is cut can be avoided, the temperature rise of the ultrahigh pressure cylinder is avoided, and the unit safety is ensured.
Description
Technical Field
The utility model relates to the technical field of steam turbines, in particular to a shaft seal steam leakage device of a steam turbine ultrahigh pressure cylinder.
Background
The rotor of the steam turbine must pass through the cylinder and be supported on the bearing, a gap needs to be reserved at the position where the rotor passes through the cylinder, when the steam turbine normally operates, for the two ends of the high pressure cylinder and the medium pressure cylinder, the steam pressure in the cylinder is greater than the environmental pressure, part of the steam leaks from the gap, the loss of working media and heat is caused, and the leaked steam can enter a bearing box of the steam turbine to influence the quality of lubricating oil and the normal operation of the bearing. Therefore, a shaft seal steam leakage device is arranged at the shaft end of the steam turbine. However, when the ultrahigh pressure cylinder of the secondary reheating unit is provided with the shaft seal for leaking steam to the secondary reheating low-temperature steam pipeline, a shut-off device is not arranged, and when the ultrahigh pressure cylinder is switched, steam can be reversely blown to the ultrahigh pressure cylinder through the ultrahigh pressure steam leaking pipeline, so that the exhaust steam temperature of the ultrahigh pressure cylinder is further increased. Therefore, the shaft seal steam leakage device of the turbine ultrahigh pressure cylinder is provided for recovering the steam leakage and solving the problem of steam back-flowing.
SUMMERY OF THE UTILITY MODEL
The utility model adopts the following technical scheme:
the shaft seal steam leakage device of the turbine ultra-high pressure cylinder comprises a shaft seal heater, a high-pressure steam leakage pipeline from front and rear shaft ends of the ultra-high pressure cylinder to a low-temperature reheating steam pipeline, a medium-pressure steam leakage pipeline from front and rear shaft ends of the ultra-high pressure cylinder to a medium-low pressure communicating pipe, and a low-pressure steam leakage pipeline from front and rear shaft ends of the ultra-high pressure cylinder to the shaft seal heater, wherein steam parameters in the high-pressure steam leakage pipeline are matched with those of the low-temperature reheating steam pipeline, steam parameters in the medium-pressure steam leakage pipeline are matched with those of the medium-low pressure communicating pipe, a check valve is arranged on the high-pressure steam leakage pipeline, a plurality of temperature measuring points are arranged at the front end and the rear end of the check valve, and a flow measuring device is arranged on the medium-pressure steam leakage pipeline.
As a further description of the above technical solution:
the high-pressure steam leakage pipeline is led out from the front shaft end and the rear shaft end of the ultrahigh pressure cylinder in two ways, and each high-pressure steam leakage pipeline is provided with a check valve.
As a further description of the above technical solution:
at least two temperature measuring points are respectively arranged at the front end and the rear end of the check valve.
As a further description of the above technical solution:
the temperature measuring point is a thermocouple.
As a further description of the above technical solution:
and a check valve is arranged on the low-pressure steam leakage pipeline.
In summary, due to the adoption of the technical scheme, the utility model has the beneficial effects that:
according to the utility model, shaft seal leakage steam with different qualities is respectively collected through arranging a high-pressure steam leakage pipeline from front and rear shaft ends of an ultra-high pressure cylinder to a low-temperature reheating steam pipeline, a medium-pressure steam leakage pipeline from front and rear shaft ends of the ultra-high pressure cylinder to a medium-low pressure communicating pipe, and a low-pressure steam leakage pipeline from front and rear shaft ends of the ultra-high pressure cylinder to a shaft seal heater; the check valve is arranged on the high-pressure steam leakage pipeline, so that the phenomenon that steam reversely flees to the ultrahigh pressure cylinder through the high-pressure steam leakage pipeline when the ultrahigh pressure cylinder is cut can be avoided, the temperature rise of the ultrahigh pressure cylinder can be avoided, and the safety of a unit is ensured.
Drawings
FIG. 1 shows a schematic of the overall structure of the present invention;
illustration of the drawings:
1. a high pressure steam leak conduit; 2. a medium pressure steam leak conduit; 3. a low pressure steam leak conduit; 4. a check valve; 5. measuring a temperature point; 6. a flow measuring device; 10. an ultra-high pressure cylinder; 20. a low temperature reheat steam line; 30. a medium-low pressure communicating pipe; 40. a shaft seal heater.
Detailed Description
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.
Referring to fig. 1, the shaft seal steam leakage device of the ultra-high pressure cylinder of the steam turbine comprises a shaft seal heater 40, a high-pressure steam leakage pipeline 1 for leaking steam from front and rear shaft ends of the ultra-high pressure cylinder 10 to a low-temperature reheating steam pipeline 20, a medium-pressure steam leakage pipeline 2 for leaking steam from front and rear shaft ends of the ultra-high pressure cylinder 10 to a medium-low pressure communicating pipe 30, and a low-pressure steam leakage pipeline 3 for leaking steam from front and rear shaft ends of the ultra-high pressure cylinder 10 to the shaft seal heater 40, wherein steam parameters in the high-pressure steam leakage pipeline 1 are matched with steam parameters of the low-temperature reheating steam pipeline 20, and steam parameters in the medium-pressure steam leakage pipeline 2 are matched with steam parameters of the medium-low pressure communicating pipe 30.
The check valve 4 is arranged on the high-pressure steam leakage pipeline 1, so that steam can be prevented from reversely flowing to the ultrahigh-pressure cylinder 10 through the high-pressure steam leakage pipeline 1 when the ultrahigh-pressure cylinder 10 is used for cutting cylinders, and the front end and the rear end of the check valve 4 are provided with the plurality of temperature measuring points 5, so that the on-off state of the check valve 4 can be conveniently monitored at any time. The flow measuring device 6 is arranged on the medium-pressure steam leakage pipeline 2, and the steam flow from the shaft seal steam leakage to the medium-low pressure communicating pipe 30 can be monitored conveniently.
Specifically, the high-pressure steam leakage pipeline 1 is led out from the front shaft end and the rear shaft end of the ultra-high pressure cylinder 10 in two ways, and each high-pressure steam leakage pipeline 1 is provided with a check valve 4.
Specifically, at least two temperature measuring points 5 are respectively arranged at the front end and the rear end of the check valve 4.
Specifically, the temperature measuring point 5 is a thermocouple.
Specifically, the low-pressure steam leakage pipeline 3 is provided with a check valve.
When the ultrahigh pressure cylinder is in normal operation, shaft seal steam leakage of the ultrahigh pressure cylinder is divided into three high-pressure, medium-pressure and low-pressure steam leakage pipelines, the three high-pressure steam leakage pipelines are respectively collected according to different steam parameters, and the check valve is arranged on the high-pressure steam leakage pipeline, so that steam can be prevented from reversely fleeing to the ultrahigh pressure cylinder through the high-pressure steam leakage pipeline when the ultrahigh pressure cylinder is switched, the temperature rise of the ultrahigh pressure cylinder can be avoided, and the safety of a unit is ensured.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and equivalent alternatives or modifications according to the technical solution of the present invention and the inventive concept thereof should be covered by the scope of the present invention.
Claims (5)
1. The utility model provides a shaft seal steam leakage device of steam turbine ultrahigh pressure cylinder, includes shaft seal heater (40), its characterized in that: also comprises a high-pressure steam leakage pipeline (1) from steam leakage at the front and rear shaft ends of the ultrahigh-pressure cylinder (10) to a low-temperature reheating steam pipeline (20), and a medium-pressure steam leakage pipeline (2) for leading the front shaft end and the rear shaft end of the ultra-high pressure cylinder (10) to leak steam to a medium-low pressure communicating pipe (30), and a low-pressure steam leakage pipeline (3) for leaking steam from the front shaft end and the rear shaft end of the ultra-high pressure cylinder (10) to the shaft seal heater (40), the steam parameter in the high-pressure steam leakage pipeline (1) is matched with the steam parameter of the low-temperature reheating steam pipeline (20), the steam parameters in the medium-pressure steam leakage pipeline (2) are matched with the steam parameters of the medium-low pressure communicating pipe (30), a check valve (4) is arranged on the high-pressure steam leakage pipeline (1), a plurality of temperature measuring points (5) are arranged at the front end and the rear end of the check valve (4), and a flow measuring device (6) is arranged on the medium-pressure steam leakage pipeline (2).
2. The shaft seal steam leakage device of the ultra-high pressure cylinder of the steam turbine according to claim 1, wherein: the high-pressure steam leakage pipeline (1) is led out from the front shaft end and the rear shaft end of the ultra-high pressure cylinder (10) in two ways, and a check valve (4) is arranged on each high-pressure steam leakage pipeline (1).
3. The shaft seal steam leakage device of the ultra-high pressure cylinder of the steam turbine according to claim 2, wherein: at least two temperature measuring points (5) are respectively arranged at the front end and the rear end of the check valve (4).
4. The shaft seal steam leakage device of the ultra-high pressure cylinder of the steam turbine according to claim 3, wherein: the temperature measuring point (5) is a thermocouple.
5. The shaft seal steam leakage device of the ultra-high pressure cylinder of the steam turbine according to claim 1, wherein: and a check valve is arranged on the low-pressure steam leakage pipeline (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220363864.XU CN216741648U (en) | 2022-02-23 | 2022-02-23 | Shaft seal steam leakage device of ultrahigh pressure cylinder of steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220363864.XU CN216741648U (en) | 2022-02-23 | 2022-02-23 | Shaft seal steam leakage device of ultrahigh pressure cylinder of steam turbine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216741648U true CN216741648U (en) | 2022-06-14 |
Family
ID=81919922
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220363864.XU Expired - Fee Related CN216741648U (en) | 2022-02-23 | 2022-02-23 | Shaft seal steam leakage device of ultrahigh pressure cylinder of steam turbine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216741648U (en) |
-
2022
- 2022-02-23 CN CN202220363864.XU patent/CN216741648U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20220614 |
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| CF01 | Termination of patent right due to non-payment of annual fee |