CN209976588U - Double-backpressure wet condensing steam turbine shaft seal steam return drainage system - Google Patents
Double-backpressure wet condensing steam turbine shaft seal steam return drainage system Download PDFInfo
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- CN209976588U CN209976588U CN201920352502.9U CN201920352502U CN209976588U CN 209976588 U CN209976588 U CN 209976588U CN 201920352502 U CN201920352502 U CN 201920352502U CN 209976588 U CN209976588 U CN 209976588U
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Abstract
The utility model discloses a wet condensing steam turbine bearing seal return steam drainage system of two backpressures, include: shaft seal return-steam pipeline and condenser, its characterized in that still includes: the condensate water collection water tank, the condensate water collection water tank sets up between bearing seal return steam pipeline and condenser, links to each other with bearing seal return steam pipeline and condenser respectively through the pipeline, still includes: one end of the condensed water conveying pipeline is connected with the condensed water collecting water tank, and the other end of the condensed water conveying pipeline is connected with the condenser. The utility model discloses set up the condensate water collection water tank between bearing seal return steam pipe way and condenser, eliminated the hydrophobic adverse effect to the condenser vacuum of bearing seal return steam, improved A condenser vacuum tightness, reduced condenser operation backpressure, the unit economic nature improves.
Description
Technical Field
The utility model belongs to the electric power production field, specifically speaking relates to a two wet condensing steam turbine bearing seal steam return drainage systems of backpressure.
Background
When the power plant unit normally operates, drainage generated by shaft seal steam return pipelines of the high and medium pressure cylinder, the low pressure cylinder A and the low pressure cylinder B is discharged into a condenser after passing through respective TLV type free floating ball type automatic steam traps. The operation of the steam trap is abnormal, the bypass is difficult to adjust, air enters the condenser A, the vacuum influence on the condenser is large, the pressure before the shaft seal steam return pipeline drains is-2 to-4 kPa, the pressure behind the steam trap is-88 to-95 kPa, and large pressure difference exists between the front part and the rear part of the steam trap, when drainage regulation is abnormal, the problems of no drainage of a steam trap, serious water accumulation of a shaft seal steam return pipeline, abnormal operation of a shaft seal system, steam bleeding of a steam turbine shaft seal and the like can occur, therefore, when a unit operates, the opening of a bypass valve of the steam trap must be regulated to ensure smooth drainage of the shaft seal steam return, and the shaft seal return steam drainage amount is greatly changed along with the load of the group and the running backpressure of the condenser, so that the opening degree of a bypass valve of the shaft seal return steam trap is difficult to adjust, part of shaft seal return steam mixed with air is inevitably leaked into the condenser, the vacuum tightness of the condenser is poor, and even the vacuum of the condenser is influenced.
The Chinese patent with the application number of 201820207905.X discloses a water supply pump small turbine shaft seal steam return drainage system, which comprises a water supply pump small turbine, a shaft seal steam return pipeline, a condenser pit, a U-shaped water seal and a condenser, wherein the water supply pump small turbine is provided with a shaft seal header; the shaft seal steam return pipeline comprises a shaft seal steam return main pipeline and a shaft seal steam return branch pipeline, the header is provided with two shaft seal steam return branch pipelines, the two shaft seal steam return main pipelines are converged into a shaft seal steam return main pipeline, and the shaft seal steam return main pipeline is connected with the shaft seal heater, so that the problems of blocking of the shaft seal steam return pipeline and damage of the vacuum of the condenser are effectively solved.
In view of this, the present invention is provided.
Disclosure of Invention
The to-be-solved technical problem of the utility model lies in overcoming prior art's not enough, provides a two backpressure wet condensing steam turbine bearing seal steam return drainage systems.
In order to solve the technical problem, the utility model adopts the following basic concept:
a kind of double back pressure wet condensing steam turbine shaft seal returns the steam drainage system, including:
a shaft seal steam return pipeline and a condenser,
it is characterized by also comprising:
and the condensed water collecting water tank is arranged between the shaft seal steam return pipeline and the condenser and is respectively connected with the shaft seal steam return pipeline and the condenser through pipelines.
As a further aspect of the present invention, it is characterized by comprising: one end of the condensed water conveying pipeline is connected with the condensed water collecting water tank, and the other end of the condensed water conveying pipeline is connected with the condenser.
As a further aspect of the present invention, the present invention is characterized in that: one end of the condensed water conveying pipeline extends into the condensed water collecting tank from the top of the condensed water collecting tank, the pipe orifice is arranged close to the bottom of the condensed water collecting tank, and the other end of the condensed water conveying pipeline is connected with the condenser.
As a further aspect of the present invention, it is characterized by comprising: the condensed water collecting pump is arranged on the condensed water conveying pipeline and is close to the condensed water collecting water tank;
and the regulating valve is arranged on the condensed water conveying pipeline, is close to the condenser and is positioned behind the condensed water collecting pump.
As a further aspect of the present invention, it is characterized by comprising: a bypass line including a first bypass and a second bypass.
As a further aspect of the present invention, the present invention is characterized in that: one end of the first bypass extends into the condensed water collecting tank from the side part of the condensed water collecting tank, and the pipe orifice of the first bypass and the pipe orifice of the condensed water collecting tank are positioned on the same horizontal plane;
the other end is connected with a connecting pipeline between the condensed water collecting pump and the regulating valve.
As a further aspect of the present invention, the present invention is characterized in that: and one end of the second bypass is connected to the first bypass, and the other end of the second bypass is connected to a connecting pipeline between the regulating valve and the condenser.
As a further aspect of the present invention, it is characterized by comprising: one end of the condensed water collecting pipe is arranged at the top of the condensed water collecting tank;
and one end of the U-shaped water seal structure is connected with the shaft seal steam return pipeline, and the other end of the U-shaped water seal structure is arranged in an emptying manner and is positioned above the condensed water collecting pipe.
As a further aspect of the present invention, it is characterized by comprising: the shaft seal heater is connected with the top of the shaft seal heater through a shaft seal steam return pipeline;
and one end of the condensed water descending pipe is connected with the bottom of the shaft seal heater, and the other end of the condensed water descending pipe is connected with the top of the condensed water collecting water tank.
As a further aspect of the present invention, the present invention is characterized in that: comprises a U-shaped structure, one end of the U-shaped structure is connected with the bottom of the shaft seal heater, and the other end of the U-shaped structure is connected with the condensed water descending pipe.
After the technical scheme is adopted, compared with the prior art, the utility model following beneficial effect has.
1) A condensed water collecting tank is arranged between the shaft seal steam return pipeline and the condenser, so that the adverse effect of shaft seal steam return drainage on the vacuum of the condenser is eliminated, the vacuum tightness of the A condenser is improved, the running backpressure of the condenser is reduced, and the economy of a unit is improved;
2) set up U type water seal structure between bearing seal return line and condenser, eliminated the hidden danger that air and non-condensable gas got into bearing seal return line, improved the leakproofness and the economic nature of unit.
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention, are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. It is obvious that the drawings in the following description are only some embodiments, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
FIG. 1 is a schematic view of a shaft seal steam-return drainage system of the present invention;
in the figure: 1. a condensed water collection tank; 2. a shaft seal heater; 3. a condensed water collection pump; 4. adjusting a valve; 5. a shaft seal return conduit; 6. a U-shaped water seal structure; 7. a condensate downcomer; 8. a U-shaped structure; 9. a condensed water delivery line; 10. a bypass; 11. a condensed water collecting pipe.
It should be noted that the drawings and the description are not intended to limit the scope of the inventive concept in any way, but to illustrate the inventive concept by those skilled in the art with reference to specific embodiments.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments, and the following embodiments are used for illustrating the present invention, but do not limit the scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1, a double-backpressure wet condensing steam turbine shaft seal steam return drainage system comprises a shaft seal steam return pipeline 5 and a condenser (not shown in the figure), and is characterized in that: still include condensate water collection water tank 1, the condensate water collection water tank sets up between bearing seal return steam pipe 5 and condenser, links to each other with the condenser through the pipeline, sends into the condenser with the condensate water in collecting water tank 1 from the condensate water, avoids getting into air and non-condensable gas in the condenser, destroys the vacuum in the condenser.
As shown in fig. 1, includes: condensate conveying line 9, condensate collection water tank 1 is connected to one end, and the condenser is connected to the other end, the one end of condensate conveying line 9 stretches into from the top of condensate collection water tank 1, and the mouth of pipe is close to the bottom setting of condensate collection water tank 1, utilizes the water seal can avoid air and non-condensable gas to get into in the condensate conveying line 9, and then destroys the vacuum in the condenser, and the mouth of pipe is close to the bottom of the case simultaneously and has improved the volume utilization ratio of condensate collection water tank 1, and the condenser is connected to the other end of condensate conveying line 9.
As shown in fig. 1, the method further comprises: the condensed water collecting pump 3 and the regulating valve 4 are arranged on the condensed water conveying pipeline 9 and are close to the condensed water collecting water tank 1; the regulating valve 4 is also arranged on the condensate conveying line 9, close to the condenser, on the line behind the condensate collecting pump 3.
As shown in fig. 1, the method further comprises: a bypass pipeline 10, which comprises a first bypass and a second bypass, wherein one end of the first bypass extends into the condensed water collection tank from the side part of the condensed water collection tank, and the pipe orifice of the first bypass and the pipe orifice of the condensed water collection tank are positioned on the same horizontal plane; the other end is connected on the connecting pipeline between the condensed water collecting pump and the regulating valve, one end of the second bypass is connected on the first bypass, and the other end is connected on the connecting pipeline between the regulating valve and the condenser.
At the initial stage of starting a unit, the vacuum in the condenser is not established, condensed water in the condensed water collecting tank 1 cannot flow into the condenser by means of pressure difference, a condensed water collecting pump 3 is additionally arranged at the top of the condensed water collecting tank 1, the condensed water enters the condenser, after the unit is started, the vacuum in the condenser is established, the regulating valve 4 works, the condensed water collecting pump 3 stops working, the condensed water flows through the first bypass and the regulating valve 4 to enter the condenser, the liquid level height in the condensed water collecting tank 1 is regulated by the regulating valve 4, and the condensed water is conveyed into the condenser by means of the pressure difference between the condenser and the condensed water collecting tank 1; when the regulating valve 4 is in failure, the condensed water flows through the first bypass and the second bypass and enters the condenser by utilizing the pressure difference between the condenser and the condensed water collecting tank 1.
As shown in fig. 1, the method further comprises: the device comprises a condensed water collecting pipe 11 and a U-shaped water seal structure 6, wherein one end of the condensed water collecting pipe 11 is arranged at the top of a condensed water collecting tank 1; one end of the U-shaped water seal structure 6 is connected with the shaft seal steam return pipeline 5, the other end of the U-shaped water seal structure is arranged in an emptying mode and is located above the condensed water collecting pipe 11, and air and non-condensable gas in the condensed water collecting tank 1 are prevented from entering the shaft seal steam return pipeline 5 through the condensed water collecting pipe 11.
As shown in fig. 1, a part a is connected with a low-pressure cylinder shaft seal steam return pipeline a, a part B is connected with a low-pressure cylinder shaft seal steam return pipeline B, a part C is connected with a high-medium-pressure shaft seal steam return pipeline C, three shaft seal steam return pipelines are connected with a shaft seal steam return pipeline 5, in order to prevent air and non-condensable gas from entering the shaft seal steam return pipeline 5, three parts are respectively provided with a U-shaped water seal structure 6, and a pipe orifice of a condensed water collecting pipe 11 is arranged below an emptying end of the U-shaped water seal structure 6 connected with the low-pressure cylinder shaft seal steam return pipeline a/the low-pressure cylinder shaft seal steam return pipeline B; as the high and medium pressure shaft seal steam return pipeline has almost no drainage, the underground ditch is directly arranged below the emptying end of the U-shaped water seal structure 6 connected with the high and medium pressure shaft seal steam return pipeline.
As shown in fig. 1, the method further comprises: the shaft seal heating device comprises a shaft seal heater 2 and a condensed water descending pipe 7, wherein a shaft seal steam return pipeline 5 is connected with the top of the shaft seal heater 2; and one end of a condensation water descending pipe 7 is connected with the bottom of the shaft seal heater 2, and the other end is connected with the top of the condensation water collecting water tank 1.
Including U type structure 8, one end is connected with 2 bottoms of bearing seal heater, and one end is connected with condensation water downcomer 7, has avoided air and the noncondensable gas in the condensation water collection water tank 1 to get into bearing seal heater 2 through condensation water downcomer 7 in, influences bearing seal heater 2's heat transfer condition.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and although the present invention has been disclosed with reference to the above preferred embodiment, but not to limit the present invention, any person skilled in the art can make modifications or changes to equivalent embodiments by utilizing the above technical contents without departing from the scope of the present invention, and any simple modification, equivalent change and modification made to the above embodiments by the technical matters of the present invention are within the scope of the present invention.
Claims (10)
1. A kind of double back pressure wet condensing steam turbine shaft seal returns the steam drainage system, including:
a shaft seal steam return pipeline and a condenser,
it is characterized by also comprising:
and the condensed water collecting water tank is arranged between the shaft seal steam return pipeline and the condenser and is respectively connected with the shaft seal steam return pipeline and the condenser through pipelines.
2. The double back pressure wet condensing steam turbine shaft seal steam return drainage system according to claim 1, comprising: one end of the condensed water conveying pipeline is connected with the condensed water collecting water tank, and the other end of the condensed water conveying pipeline is connected with the condenser.
3. The double back pressure wet condensing steam turbine shaft seal steam return drainage system according to claim 2, characterized in that: one end of the condensed water conveying pipeline extends into the condensed water collecting tank from the top of the condensed water collecting tank, the pipe orifice is arranged close to the bottom of the condensed water collecting tank, and the other end of the condensed water conveying pipeline is connected with the condenser.
4. The double back pressure wet condensing steam turbine shaft seal steam return drainage system according to claim 3, comprising: the condensed water collecting pump is arranged on the condensed water conveying pipeline and is close to the condensed water collecting water tank;
and the regulating valve is arranged on the condensed water conveying pipeline, is close to the condenser and is positioned behind the condensed water collecting pump.
5. The double back pressure wet condensing steam turbine shaft seal steam return drainage system according to claim 2, comprising: a bypass line including a first bypass and a second bypass.
6. The double back pressure wet condensing steam turbine shaft seal steam return drainage system according to claim 5, characterized in that: one end of the first bypass extends into the condensed water collecting tank from the side part of the condensed water collecting tank, and the pipe orifice of the first bypass and the pipe orifice of the condensed water collecting tank are positioned on the same horizontal plane;
the other end is connected with a connecting pipeline between the condensed water collecting pump and the regulating valve.
7. The double back pressure wet condensing steam turbine shaft seal steam return drainage system according to claim 5, characterized in that: and one end of the second bypass is connected to the first bypass, and the other end of the second bypass is connected to a connecting pipeline between the regulating valve and the condenser.
8. The double back pressure wet condensing steam turbine shaft seal steam return drainage system according to claim 1, comprising: one end of the condensed water collecting pipe is arranged at the top of the condensed water collecting tank;
and one end of the U-shaped water seal structure is connected with the shaft seal steam return pipeline, and the other end of the U-shaped water seal structure is arranged in an emptying manner and is positioned above the condensed water collecting pipe.
9. The double back pressure wet condensing steam turbine shaft seal steam return drainage system according to claim 1, comprising: the shaft seal heater is connected with the top of the shaft seal heater through a shaft seal steam return pipeline;
and one end of the condensed water descending pipe is connected with the bottom of the shaft seal heater, and the other end of the condensed water descending pipe is connected with the top of the condensed water collecting water tank.
10. The double back pressure wet condensing steam turbine shaft seal steam return drainage system according to claim 9, characterized in that: comprises a U-shaped structure, one end of the U-shaped structure is connected with the bottom of the shaft seal heater, and the other end of the U-shaped structure is connected with the condensed water descending pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920352502.9U CN209976588U (en) | 2019-03-19 | 2019-03-19 | Double-backpressure wet condensing steam turbine shaft seal steam return drainage system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920352502.9U CN209976588U (en) | 2019-03-19 | 2019-03-19 | Double-backpressure wet condensing steam turbine shaft seal steam return drainage system |
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| Publication Number | Publication Date |
|---|---|
| CN209976588U true CN209976588U (en) | 2020-01-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920352502.9U Active CN209976588U (en) | 2019-03-19 | 2019-03-19 | Double-backpressure wet condensing steam turbine shaft seal steam return drainage system |
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| CN (1) | CN209976588U (en) |
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