CN116658261A - Shaft seal steam leakage bypass device applied to steam turbine generator unit flexibility transformation - Google Patents
Shaft seal steam leakage bypass device applied to steam turbine generator unit flexibility transformation Download PDFInfo
- Publication number
- CN116658261A CN116658261A CN202310725314.7A CN202310725314A CN116658261A CN 116658261 A CN116658261 A CN 116658261A CN 202310725314 A CN202310725314 A CN 202310725314A CN 116658261 A CN116658261 A CN 116658261A
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- Prior art keywords
- shaft seal
- steam
- pipeline
- low
- valve
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- Pending
Links
- 230000009466 transformation Effects 0.000 title abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 230000001105 regulatory effect Effects 0.000 claims description 8
- 230000004048 modification Effects 0.000 claims description 2
- 238000012986 modification Methods 0.000 claims description 2
- 238000007599 discharging Methods 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
Classifications
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- 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
- F01D25/10—Heating, e.g. warming-up before starting
-
- 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
-
- 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
- F01D25/30—Exhaust heads, chambers, or the like
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K9/00—Plants characterised by condensers arranged or modified to co-operate with the engines
- F01K9/003—Plants characterised by condensers arranged or modified to co-operate with the engines condenser cooling circuits
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
The application discloses a shaft seal steam leakage bypass device applied to the flexible transformation of a steam turbine generator unit, which belongs to the field of steam turbines and comprises a steam turbine shaft seal, a low-inlet steam pipeline, a steam turbine shaft seal pipeline, a first shut-off valve, a low-inlet steam pipeline shut-off valve and a low-pressure heater, wherein the shaft seal steam leakage bypass device is applied to the flexible transformation of the steam turbine generator unit; one end of a turbine shaft seal pipeline is connected with a turbine shaft seal under the inflexible working condition of the unit. The shaft seal steam leakage bypass device applied to the flexibility transformation of the turbo generator set disclosed by the application is applied to the flexibility transformation engineering of the turbo generator set with low-pressure cylinder expansion difference connected with the shaft seal leakage, and is used for discharging the shaft seal steam leakage introduced with low pressure into a condenser or a steam exhaust device under the flexible working condition, and the shaft seal steam leakage is still introduced into the low pressure cylinder expansion difference under the inflexible working condition, so that the influence of low pressure vibration or the expansion difference of the low pressure cylinder of the turbo generator set exceeding the safe operation range and the like is avoided.
Description
Technical Field
The application relates to the technical field of steam turbines, in particular to a shaft seal steam leakage bypass device applied to the flexible transformation of a steam turbine generator unit.
Background
After the flexibility of the steam turbine generator unit is improved, the steam inlet of the low-pressure cylinder is cut off, at the moment, two low-pressure heater steam in the steam turbine regenerative system is stopped, and after the flexibility of the low-pressure cylinder is improved, the low-pressure cylinder is stopped under the working condition of the flexibility of the low-pressure cylinder because the original 2 sections of shaft seals of the unit are connected with low pressure, and the section of gas leakage enters the low-pressure cylinder along the original low-pressure inlet pipeline, so that the low-pressure cylinder is overtemperature. The existing solving means is that the low-pressure steam inlet is started, but the low-pressure steam inlet flow is too low, the condensation water quantity is small, the low-pressure steam inlet drain side pipeline vibrates, and the operation danger is increased.
Disclosure of Invention
In order to overcome the defects of the prior art, the technical problem to be solved by the application is to provide a shaft seal steam leakage bypass device applied to the flexible transformation of a steam turbine generator unit, which is applied to the flexible transformation engineering of the steam turbine generator unit with low-pressure added by shaft seal leakage, and is used for discharging the introduced low-pressure added shaft seal steam leakage flexible working condition to a condenser or a steam exhaust device, and the low-pressure added working condition still enters the low-pressure added working condition, so that the influence of low-pressure added vibration or the expansion difference of a low-pressure cylinder of the unit exceeding a safe operation range and the like is avoided.
To achieve the purpose, the application adopts the following technical scheme:
the application provides a shaft seal steam leakage bypass device applied to flexible reconstruction of a steam turbine generator unit, which comprises a steam turbine shaft seal, a low-inlet steam pipeline, a steam turbine shaft seal pipeline, a first shut-off valve, a low-inlet steam pipeline shut-off valve and a low-pressure heater, wherein the low-inlet steam pipeline shut-off valve is arranged on the lower side of the low-pressure heater; one end of a turbine shaft seal pipeline is connected with a turbine shaft seal under the inflexible working condition of the unit, the other end of the turbine shaft seal pipeline is connected with a low-pressure inlet steam pipeline through a first shutoff valve, and the other end of the low-pressure inlet steam pipeline is connected with a low-pressure heater through a low-pressure inlet steam pipeline shutoff valve.
According to the further technical scheme, one end of a turbine shaft seal pipeline is connected with a turbine shaft seal under the flexible working condition of the unit, the other end of the turbine shaft seal pipeline is connected with a shaft seal steam leakage bypass pipeline, the other end of the shaft seal steam leakage bypass pipeline is connected with a desuperheater through a second shut-off valve, and the other end of the desuperheater is connected with a condenser or a steam exhaust device through a vacuum shut-off valve.
The further technical scheme of the application is that the inlet and the outlet of the desuperheater are provided with temperature measuring points.
The application further adopts the technical scheme that a desuperheater is provided with a desuperheater pipeline, the desuperheater pipeline is provided with a stop valve, a regulating valve and a water filter, and the desuperheater pipeline controls the water filter through the stop valve and the regulating valve.
The further technical scheme of the application is that the top of the shaft seal of the steam turbine is connected with a high-medium pressure cylinder of the steam turbine.
The beneficial effects of the application are as follows:
the shaft seal steam leakage bypass device applied to the flexibility transformation of the turbo generator set is applied to the flexibility transformation engineering of the turbo generator set with low-pressure cylinder expansion difference connected with the shaft seal leakage, the shaft seal steam leakage flexibility working condition with low pressure is introduced and discharged to a condenser or a steam exhaust device, the shaft seal steam leakage bypass device still enters the low pressure working condition without the flexibility, and the influence of low pressure vibration or the expansion difference of the low pressure cylinder of the turbo generator set exceeding the safe operation range is avoided.
Drawings
FIG. 1 is a diagram of a low pressure cylinder cooling system of the present application.
In the figure:
a high-medium pressure cylinder 1 of the steam turbine; a turbine shaft seal 2; a low inlet steam pipe 3; a turbine shaft seal pipeline 4; a shaft seal steam leakage bypass pipeline 5; a first shut-off valve 6; a second shut-off valve 7; a desuperheater 8; a vacuum shut-off valve 9; a condenser or exhaust 10; a low inlet steam line shut-off valve 11; a low-pressure heater 12; a desuperheating water pipeline 13; a shutoff valve 14; a regulating valve 15; a water filter 16.
Detailed Description
The application is further described below in connection with the following detailed description. Wherein the drawings are for illustrative purposes only and are shown in schematic, non-physical, and not intended to be limiting of the present patent; for the purpose of better illustrating embodiments of the application, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the size of the actual product; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numbers in the drawings of embodiments of the application correspond to the same or similar components; in the description of the present application, it should be understood that, if there is an azimuth or positional relationship indicated by terms such as "upper", "lower", "left", "right", etc., based on the azimuth or positional relationship shown in the drawings, it is only for convenience of describing the present application and simplifying the description, but it is not indicated or implied that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus terms describing the positional relationship in the drawings are merely illustrative and should not be construed as limitations of the present patent, and specific meanings of the terms described above may be understood by those skilled in the art according to specific circumstances.
The first embodiment is as follows:
the present application relates to a steam turbine, and more particularly to a shaft seal steam leakage bypass device applied to flexible modification of a steam turbine generator unit, which is described below with reference to fig. 1, and comprises a steam turbine shaft seal 2, a low-inlet steam pipeline 3, a steam turbine shaft seal pipeline 4, a first shut-off valve 6, a low-inlet steam pipeline shut-off valve 11 and a low-pressure heater 12; the steam turbine shaft seal 2 is connected to steam turbine shaft seal pipeline 4 one end under the inflexible operating mode of unit, low inlet steam pipeline 3 is connected through a shut-off valve 6 to the steam turbine shaft seal pipeline 4 other end, low inlet steam pipeline 3 other end is connected low pressure heater 12 through a low inlet steam pipeline shut-off valve 11, the shut-off valve 6 is opened when being applied to the steam turbine generator unit flexibility transformation project that the low pressure of bearing seal gas leakage access adds, will introduce the low bearing seal leakage flexibility operating mode of adding down and discharge to condenser or exhaust apparatus, still get into low adding under the inflexible operating mode, avoid low vibration that adds or unit low pressure jar expansion difference surpass influence such as safe operation scope.
The second embodiment is as follows:
in the following description of the present embodiment with reference to fig. 1, a first embodiment is further described, where one end of a turbine shaft seal pipeline 4 is connected to a turbine shaft seal 2 under a unit flexible working condition, the other end of the turbine shaft seal pipeline 4 is connected to a shaft seal leakage bypass pipeline 5, the other end of the shaft seal leakage bypass pipeline 5 is connected to a attemperator 8 through a second shut-off valve 7, the other end of the attemperator 8 is connected to a condenser or a steam exhaust device 10 through a vacuum shut-off valve 9, the second shut-off valve 7 is opened during the flexible working condition, and the attemperator 8 is matched with a cooling water pipeline to reduce the shaft seal leakage temperature to an allowable temperature.
And a third specific embodiment:
next, this embodiment will be further described with reference to fig. 1, in which the inlet and outlet of the desuperheater 8 are provided with temperature measurement points.
The specific embodiment IV is as follows:
next, referring to fig. 1, a description will be given of the first embodiment, in which a desuperheater 8 is provided with a desuperheater pipe 13, a stop valve 14, a regulating valve 15, and a water filter 16 are provided on the desuperheater pipe 13, the desuperheater pipe 13 controls the water filter 16 through the stop valve 14 and the regulating valve 15, the desuperheater pipe 13 desuperheaters desuperheater, the stop valve 14 controls the desuperheater water supply and regulating valve 15, the water filter 16, and the like to form a desuperheater system, and the water filter 16 controls the desuperheater water flow rate.
Fifth embodiment:
next, this embodiment will be further described with reference to fig. 1, in which the top of a turbine shaft seal 2 is connected to a turbine high-intermediate pressure cylinder 1.
The beneficial effects of the embodiment are that:
1. the operation safety of the low pressure cylinder can be further increased:
when the unit low pressure cylinder is in flexible operation, the low pressure cylinder is not over-heated due to the fact that the shaft seal leaks steam, and operation practice shows that under the flexible working condition, after the shaft seal leaks air and enters the low inlet pipeline, the valve at the low inlet is closed, the shaft seal leaks air and reversely enters the low pressure cylinder, so that the temperature of the low pressure cylinder is increased, the temperature field of the low pressure cylinder is unstable, the device leads the shaft seal leaks air pipeline to be led out to the condenser or the steam exhaust device 10, the phenomenon of over-temperature of the low pressure cylinder is avoided, and the operation safety of the low pressure cylinder is further improved.
2. The flexibility of the low pressure cylinder can be further increased:
the device has two operation modes of a steam turbine generator unit flexible working condition and an inflexible working condition, the inflexible working condition shaft seal steam leakage is connected into the low-pressure heater 12, the section of the flexible working condition shaft seal steam leakage is connected into the condenser or the steam exhaust device 12, and the two branches of the shaft seal pipeline are respectively provided with an electric valve, so that flexible switching between the two working conditions of the unit is ensured.
3. Avoiding low-added vibration:
under the unit flexibility operating condition, in order to avoid the overtemperature of the low pressure cylinder, the valve of the low-pressure inlet steam pipeline is closed, so that the shaft seal steam leakage enters the original low pressure inlet, at the moment, the low air filling source only has the steam leakage of the section, the flow is about 2t/h, the low pressure inlet drain water level cannot be ensured, the low pressure inlet is internally used for drain vaporization, the low pressure inlet is used for generating vibration, the device introduces the steam of the section into the condenser or the steam exhaust device 10, and the condition of low pressure inlet vibration during flexibility is avoided.
While the application has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the application. The application is not to be limited by the specific embodiments disclosed herein, but rather, embodiments falling within the scope of the appended claims are intended to be embraced by the application.
Claims (5)
1. The shaft seal steam leakage bypass device for the flexible reconstruction of the steam turbine generator unit is characterized by comprising a steam turbine shaft seal (2), a low-inlet steam pipeline (3), a steam turbine shaft seal pipeline (4), a first shut-off valve (6), a low-inlet steam pipeline shut-off valve (11) and a low-pressure heater (12);
one end of a turbine shaft seal pipeline (4) is connected with a turbine shaft seal (2) under a non-flexible working condition of the unit, the other end of the turbine shaft seal pipeline (4) is connected with a low-pressure inlet steam pipeline (3) through a first shut-off valve (6), and the other end of the low-pressure inlet steam pipeline (3) is connected with a low-pressure heater (12) through a low-pressure inlet steam pipeline shut-off valve (11).
2. The shaft seal steam leakage bypass device for flexibly modifying a steam turbine generator unit according to claim 1, wherein the device comprises:
one end of a turbine shaft seal pipeline (4) is connected with a turbine shaft seal (2) under the working condition of unit flexibility, the other end of the turbine shaft seal pipeline (4) is connected with a shaft seal steam leakage bypass pipeline (5), the other end of the shaft seal steam leakage bypass pipeline (5) is connected with a attemperator (8) through a second shut-off valve (7), and the other end of the attemperator (8) is connected with a condenser or a steam exhaust device (10) through a vacuum shut-off valve (9).
3. The shaft seal steam leakage bypass device for flexibly modifying a steam turbine generator unit according to claim 2, wherein the device comprises:
the inlet and outlet of the desuperheater (8) are provided with temperature measuring points.
4. The shaft seal steam leakage bypass device for flexibly modifying a steam turbine generator unit according to claim 3, wherein the shaft seal steam leakage bypass device comprises:
the desuperheater (8) is provided with a desuperheater pipeline (13), the desuperheater pipeline (13) is provided with a stop valve (14), a regulating valve (15) and a water filter (16), and the desuperheater pipeline (13) controls the water filter (16) through the stop valve (14) and the regulating valve (15).
5. The shaft seal steam leakage bypass device applied to flexible modification of a steam turbine generator unit according to claim 1 or 2, wherein the device is characterized in that:
the top of the turbine shaft seal (2) is connected with a turbine high-medium pressure cylinder (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310725314.7A CN116658261A (en) | 2023-06-19 | 2023-06-19 | Shaft seal steam leakage bypass device applied to steam turbine generator unit flexibility transformation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310725314.7A CN116658261A (en) | 2023-06-19 | 2023-06-19 | Shaft seal steam leakage bypass device applied to steam turbine generator unit flexibility transformation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116658261A true CN116658261A (en) | 2023-08-29 |
Family
ID=87715078
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310725314.7A Pending CN116658261A (en) | 2023-06-19 | 2023-06-19 | Shaft seal steam leakage bypass device applied to steam turbine generator unit flexibility transformation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116658261A (en) |
-
2023
- 2023-06-19 CN CN202310725314.7A patent/CN116658261A/en active Pending
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