CN210460764U - Shaft seal overflow steam heat energy recycling system and device - Google Patents
Shaft seal overflow steam heat energy recycling system and device Download PDFInfo
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- CN210460764U CN210460764U CN201920601773.3U CN201920601773U CN210460764U CN 210460764 U CN210460764 U CN 210460764U CN 201920601773 U CN201920601773 U CN 201920601773U CN 210460764 U CN210460764 U CN 210460764U
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Abstract
The utility model belongs to the technical field of steam recovery, in order to solve the extravagant problem of heat energy that prior art shaft seal steam system exists, the utility model provides a shaft seal overflow steam heat energy system, device of recycling, the system includes: the steam condenser comprises a shaft seal steam header, a shaft seal steam supply main pipe, a shaft seal steam overflow main pipe and a condenser, wherein a shaft seal overflow valve is arranged between the shaft seal steam overflow main pipe and the condenser; the low-pressure heater is connected with the shaft seal steam overflow main pipe; the first end of the inverted U-shaped bent pipe is connected with the steam adding side of the low-pressure heater, the second end of the inverted U-shaped bent pipe is connected with a branch pipe connected with the shaft seal steam overflow main pipe, and a valve is arranged on the branch pipe; and the centralized flash tank and the emptying pipe are connected with the second end of the inverted U-shaped bent pipe through pipelines. Therefore, the cascade utilization of the shaft seal overflow steam of the unit can be realized, the economy of the unit is improved, and the heat load of the condenser is also reduced.
Description
Technical Field
The utility model relates to a steam recovery technical field especially relates to a system, device are recycled to shaft seal overflow steam heat energy.
Background
The shaft seal steam system of steam turbine generally is provided with a steam main pipe, the outer steam supply source generally sets up two tunnel, come from reheat cold section and auxiliary steam header respectively, shaft seal steam takes over respectively from the shaft seal main pipe and leads to each cylinder both ends bearing seal cavity of steam turbine, the shaft seal main pipe still sets up overflow steam pipeline all the way, two tunnel outer steam supply sources and overflow steam all the way set up governing valve automatic adjustment respectively, the unit load risees, when reaching self sealss state, when the shaft seal return steam of high, intermediate pressure jar surpassed low pressure bearing seal steam supply volume, outer steam automatic cutout, overflow steam governing valve automatic opening adjusts, maintain the main pipe pressure of shaft seal invariable.
The shaft seal heater, also called shaft seal cooler, is a tubular surface heater, which is an important heat exchange device of the turbine shaft seal system, and its main function is to collect the steam leakage of the shaft seal at the cylinder end and the valve rod of the turbine, and to use the heat energy of these steam to heat the condensed water. Because the steam also contains air, when the steam releases heat in the shaft seal heater, the steam is condensed into water, and the air needs to be discharged, thereby utilizing the energy of steam leakage, recovering working media, improving the heat economy of the steam turbine unit, separating the air and ensuring the normal work of the shaft seal system.
In recent years, a large number of air cooling units are put into operation in China, for example, the inventor finds that in a steam turbine shaft seal steam system in the prior art, a shaft seal steam supply and regulation valve and a shaft seal steam overflow and regulation valve are used for keeping the pressure of a shaft seal steam header and each steam chamber of a shaft seal to be a constant value of 35 mbar, when the load of the unit reaches 40-60% of rated load and increases along with the load, the pressure of the shaft seal steam header is increased, and redundant steam must be discharged to a condenser by opening the shaft seal steam overflow and regulation valve so as to maintain the pressure of the header to be constant. The redundant steam is not utilized in a gradient manner and is directly discharged to the condenser, so that heat energy waste is caused, the heat load of the condenser is increased, and the economical efficiency of the unit is reduced.
SUMMERY OF THE UTILITY MODEL
In order to solve the extravagant problem of heat energy that prior art shaft seal steam system exists, the utility model provides a system, device are recycled to shaft seal overflow steam heat energy can realize the step utilization of group's quick-witted bearing seal overflow steam, have improved the economic nature of unit, have also reduced condenser heat load.
In order to achieve the above object, the present invention provides a technical solution comprising:
the utility model discloses an aspect provides a shaft seal overflow steam heat energy system of recycling, include: the steam condenser comprises a shaft seal steam header, a shaft seal steam supply main pipe, a shaft seal steam overflow main pipe and a condenser, wherein a shaft seal overflow valve is arranged between the shaft seal steam overflow main pipe and the condenser; it is characterized by also comprising:
the low-pressure heater is connected with the shaft seal steam overflow main pipe;
the first end of the inverted U-shaped bent pipe is connected with the steam adding side of the low-pressure heater, the second end of the inverted U-shaped bent pipe is connected with a branch pipe connected with the shaft seal steam overflow main pipe, and a valve is arranged on the branch pipe; and
and the centralized flash tank and the emptying pipe are connected with the second end of the inverted U-shaped bent pipe through pipelines.
The embodiment of the utility model provides an in the preferred embodiment, the inside bearing seal of system supplies vapour transfer valve with the structure relation of bearing seal overflow valve sets to: when the load of the unit corresponding to the shaft seal steam header reaches 50% -70% of the rated load, the shaft seal steam supply and regulation valve in the shaft seal system corresponding to the shaft seal steam header is fully closed, the shaft seal overflow valve is opened, and the valve on the branch pipe is also closed, so that the overflow steam is discharged into the condenser.
The embodiment of the utility model provides an in the preferred embodiment, the inside bearing seal of system supplies vapour transfer valve with the structure relation of bearing seal overflow valve still sets into: when the load operation of the unit corresponding to the shaft seal steam header is stable, the shaft seal overflow valve is closed, the pipeline from the overflow to the condenser is isolated, and the valve on the branch pipe is opened, so that the overflow steam is discharged into the low-pressure heater.
The embodiment of the utility model provides an in the preferred embodiment, invert the U type return bend the second end with concentrate the flash tank be provided with the trap between the pipeline that the evacuation union coupling.
The embodiment of the utility model provides a in the further preferred implementation mode be provided with manual valve, bypass valve around the trap respectively.
The utility model discloses the second aspect still provides a device is recycled to shaft seal overflow steam heat energy, a serial communication port, include:
the low-pressure heater is connected with a shaft seal steam overflow main pipe in the shaft seal steam system;
the first end of the inverted U-shaped bent pipe is connected with the steam adding side of the low-pressure heater, the second end of the inverted U-shaped bent pipe is connected with a branch pipe connected with the shaft seal steam overflow main pipe, and a valve is arranged on the branch pipe; and
and the centralized flash tank and the emptying pipe are connected with the second end of the inverted U-shaped bent pipe through pipelines.
In the preferred implementation manner of the embodiment of the present invention, when the unit load corresponding to the shaft seal steam system reaches 50% -70% of the rated load, the valve on the branch pipe is in a closed state; and the shaft seal steam supply valve in the shaft seal steam system is fully closed, and the shaft seal overflow valve is opened, so that the overflow steam is discharged into the condenser.
In the preferred implementation manner of the embodiment of the present invention, when the unit load operation corresponding to the shaft seal steam system is stable, the valve on the branch pipe is in an open state; and the shaft seal overflow valve is closed, and the pipeline of the overflow steam to the condenser is isolated, so that the overflow steam is discharged into the low-pressure heater.
The embodiment of the utility model provides an in the preferred embodiment, invert the U type return bend the second end with concentrate the flash tank be provided with the trap between the pipeline that the evacuation union coupling.
The embodiment of the utility model provides a in the further preferred implementation mode be provided with manual valve, bypass valve around the trap respectively.
Adopt the above technical scheme provided by the utility model, can obtain following beneficial effect at least:
and redundant steam of the shaft seal is connected to the steam side of the low-pressure heater to form cascade utilization, so that the economy of the whole unit is improved. And an inverted U-shaped bent pipe is arranged on a low pressure adding pipeline connected with overflow steam, so that when the leakage accident of the low pressure adding heat exchange pipe occurs, after the water level in the low pressure heater rises, condensed water cannot flow back into the shaft seal steam header.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure and/or process particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
Fig. 1 is a schematic structural view of an embodiment of the present invention, which provides a shaft seal overflow steam heat energy recycling system.
Detailed Description
The following detailed description will be made with reference to the accompanying drawings and examples, so as to solve the technical problems by applying technical means to the present invention, and to fully understand and implement the technical effects of the present invention. It should be noted that the specific description is only for the purpose of making the present invention easier and clearer for those skilled in the art to understand, and is not a limiting explanation of the present invention; and as long as no conflict is formed, the embodiments and the features in the embodiments of the present invention can be combined with each other, and the technical solutions formed are all within the scope of the present invention.
In addition, it should be noted that the "connection" mentioned in the present embodiment may be directly connected through a pipe, or may be indirectly connected through a pipe after another element (for example, a valve) is provided in the middle.
The technical solution of the present invention is described in detail below with reference to the accompanying drawings and specific embodiments:
examples
This embodiment has following technical problem to axle seal steam system in the prior art: when the load of the unit reaches 40-60% of rated load and increases along with the load, the pressure of the shaft seal steam header is increased, and redundant steam must be discharged to a condenser by opening a shaft seal steam overflow regulating valve so as to maintain the pressure of the header to be constant; the redundant steam is not utilized in a gradient manner and is directly discharged to the condenser, so that heat energy waste is caused, the heat load of the condenser is increased, and the economical efficiency of the unit is reduced.
Therefore, the present embodiment provides an improvement to the shaft seal overflow steam thermal energy recycling system in the prior art, and provides a shaft seal overflow steam thermal energy recycling system, which also includes a shaft seal steam system (for example, a system corresponding to a dashed box 100 in fig. 1), where the shaft seal overflow steam system 100 includes:
the shaft seal steam header can be square or cylindrical, can be selected by a user according to different scenes, is provided with a plurality of pipeline connecting ports, and is provided with valve bodies for controlling steam to be discharged or not to be discharged at the positions corresponding to the ports;
the steam supply main pipe is provided with an auxiliary steam supply 110 (namely a steam supply source), and the steam supply main pipe is also provided with a plurality of steam supply regulating valves of different types;
a main shaft seal steam-overflowing pipe 120, wherein the main shaft seal steam-overflowing pipe 120 is provided with a plurality of shaft seal overflow valves, such as valves with the corresponding model numbers marked as AA 012; and
and the condenser 130 is connected with the shaft seal steam header, the shaft seal steam supply main pipe and the shaft seal steam overflow main pipe 120.
The condenser provided by the embodiment is a heat exchanger for condensing the exhaust steam of the steam turbine into water, and is also called a water re-condenser; the condenser is mainly used in a steam turbine power plant and is divided into a water-cooling condenser and an air-cooling condenser (the embodiment does not specifically limit the condenser). The condenser can condense the exhaust steam of the turbine into water for reuse by the boiler, and can establish vacuum and maintain the vacuum at the exhaust steam part of the turbine. Moreover, the shaft seal steam system provided by this embodiment may be different from the shaft seal steam systems of different units, but the design principle thereof is basically the same, and the shaft seal steam system can be roughly divided into two forms of an external steam source steam supply mode and a self-sealing steam supply mode according to the steam supply mode (this embodiment also does not specifically limit the same); under various operating conditions of the steam turbine, the shaft seal steam system is required to provide steam for sealing the shaft seal and the valve rod.
As shown in fig. 1, the shaft seal overflow steam heat energy recycling system provided in this embodiment includes, in addition to the shaft seal steam system 100, a shaft seal overflow steam heat energy recycling device 200 connected to the shaft seal steam system 100. The shaft seal overflow steam heat energy recycling device 200 includes:
a low pressure heater connected to the shaft seal steam-overflowing main pipe 120;
the inverted U-shaped bent pipe 220 is characterized in that a first end A of the inverted U-shaped bent pipe 220 is connected with a steam adding side 210 of the low-pressure heater, a second end B of the inverted U-shaped bent pipe 220 is connected with a branch pipe connected with the shaft seal steam overflow main pipe 120, and a valve 230 is arranged on the branch pipe; and
a centralized flash tank 260 and an evacuation pipe 270 connected by piping to the second end B of inverted U-bend 220.
The inverted U-bend 220 is an inverted U-shaped hollow pipe, and for the specific size of the pipe, the present embodiment does not limit the pipe, and the specific size of the pipe may be determined according to the actual exhaust gas volume, and of course, the inverted U-bend 220 mentioned in the present embodiment is not strictly limited to the shape of the letter "U", and as long as the pipe can perform a siphon function, the pipe belongs to the protection scope of the inverted U-bend 220 mentioned in the present embodiment. Furthermore, as a preferred embodiment, the steam addition side 210 corresponds to a lower level than the level of the branch pipe connected to the shaft seal steam overflow main pipe 120; this can prevent the reverse flow from occurring better.
Therefore, in the technical scheme provided by the embodiment, the surplus steam of the shaft seal is connected to the steam side of the low-pressure heater to form cascade utilization, so that the economy of the whole unit is improved. And an inverted U-shaped bent pipe is arranged on a low pressure adding pipeline connected with overflow steam, so that when the leakage accident of the low pressure adding heat exchange pipe occurs, after the water level in the low pressure heater rises, condensed water cannot flow back into the shaft seal steam header.
In a preferred embodiment of the present embodiment, the structural relationship between the shaft seal steam supply regulating valve and the shaft seal relief valve inside the system is set as follows: when the load of the unit corresponding to the shaft seal steam header reaches 50% -70% of the rated load, the shaft seal steam supply regulating valve in the shaft seal system corresponding to the shaft seal steam header is fully closed, the shaft seal overflow valve is opened, and the valve 230 on the branch pipe is also closed, so that the overflow steam is discharged into the condenser 130. Namely, the valve 230 on the branch pipe is in a closed state when the load of the unit corresponding to the shaft seal steam system reaches 50% -70% of the rated load; and the shaft seal steam supply regulating valve in the shaft seal steam system is fully closed, and the shaft seal overflow valve is opened, so that the overflow steam is discharged into the condenser 130.
The valve 230 on the branch pipe mentioned in the present embodiment may be configured as an electric valve corresponding to fig. 1, but the present embodiment is not limited thereto, and may also be configured as a manual valve, for example.
In a further preferred embodiment of this embodiment, the structural relationship between the shaft seal steam supply and regulation valve and the shaft seal relief valve inside the system is further set as follows: when the unit load operation that the shaft seal steam header corresponds is stable, the shaft seal overflow valve is closed, keeps apart the overflow to the condenser pipeline to open the valve on the branch pipe, make overflow steam discharge into low pressure feed water heater. Namely, the valve 230 on the branch pipe is in an open state when the load operation of the unit corresponding to the shaft seal steam system is stable; and the shaft seal relief valve is closed, isolating the relief to the condenser line, allowing the relief steam to be discharged into the low pressure heater, for example, into the low pressure steam side 210 of the low pressure heater.
As shown in fig. 1, in the preferred embodiment of the present invention, a trap 240 is disposed between the second end a of the inverted U-bend 220 and the pipeline connecting the centralized flash tank 260 and the emptying pipe 270 (the air-discharging pipeline). In a further preferred embodiment, manual valves 242, 244 and a bypass valve 250 are provided before and after trap 240, respectively.
More specifically, the low-pressure heater in the shaft seal overflow steam heat energy recycling device 200 is referred to as a #2 low-pressure heater (a2 low-pressure heater); by adopting the technical scheme provided by the embodiment, a pipeline and a system are added after the shaft seal steam overflow regulating valve to connect the overflow steam into the steam side 210 of the #2 low-pressure heater, and the original pipeline overflowing to the condenser 130 is reserved. When starting and stopping the machine, the overflow steam is discharged into the condenser 130, after the load of the standby group is stable, the pipeline of the overflow steam to the condenser 130 is isolated, and the overflow steam is discharged into the A2 low-pressure gas-charging side 210; when the trip is abnormal, the shaft seal steam overflow valve is basically closed along with the reduction of load, the overflow steam can still be discharged into the A2 low-pressure air charging side 210 without switching, and the standby group is switched after being stopped; the A2 low water adding level is protected and controlled by the A2 self water level, and an inverted U-shaped bent pipe is arranged on an overflow steam access A2 low water adding pipeline, so that when the leakage accident of the A2 low water adding heat exchange pipe occurs, the condensed water cannot flow back into the shaft seal steam header after the A2 water level rises; the rear pipeline of the shaft seal steam overflow valve is additionally provided with a centralized flash tank 260 for automatic drainage, and drainage is discharged into the centralized flash tank and is connected with an interface of an A2 low-pressure emptying pipe 270.
Practice proves that by adopting the technical scheme, the redundant steam of the shaft seal is connected to the steam side of the #2 low-pressure heater to form cascade utilization, the economy of the unit is improved, and the power supply coal consumption can be reduced by about 0.02 g/kwh.
Finally, it should be understood that the above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way. The above disclosed embodiments and technical content can be utilized by any person skilled in the art to make many possible variations, simple substitutions and the like without departing from the scope of the present invention, which is within the protection scope of the present invention.
Claims (10)
1. A shaft seal overflow steam heat energy reuse system, comprising: the steam condenser comprises a shaft seal steam header, a shaft seal steam supply main pipe, a shaft seal steam overflow main pipe and a condenser, wherein a shaft seal overflow valve is arranged between the shaft seal steam overflow main pipe and the condenser; it is characterized by also comprising:
the low-pressure heater is connected with the shaft seal steam overflow main pipe;
the first end of the inverted U-shaped bent pipe is connected with the steam adding side of the low-pressure heater, the second end of the inverted U-shaped bent pipe is connected with a branch pipe connected with the shaft seal steam overflow main pipe, and a valve is arranged on the branch pipe; and
and the centralized flash tank and the emptying pipe are connected with the second end of the inverted U-shaped bent pipe through pipelines.
2. The system of claim 1, wherein the shaft seal steam supply and adjustment valve and the shaft seal relief valve inside the system are configured in relation to one another such that: when the load of the unit corresponding to the shaft seal steam header reaches 50% -70% of the rated load, the shaft seal steam supply and regulation valve in the shaft seal system corresponding to the shaft seal steam header is fully closed, the shaft seal overflow valve is opened, and the valve on the branch pipe is also closed, so that the overflow steam is discharged into the condenser.
3. The system of claim 1, wherein the shaft seal steam supply and adjustment valve and the shaft seal relief valve inside the system are further configured in a relationship: when the load operation of the unit corresponding to the shaft seal steam header is stable, the shaft seal overflow valve is closed, the pipeline from the overflow to the condenser is isolated, and the valve on the branch pipe is opened, so that the overflow steam is discharged into the low-pressure heater.
4. The system of claim 1, wherein a trap is disposed between the second end of the inverted U-bend and the conduit connecting the centralized flash tank and the evacuation pipe.
5. The system of claim 4, wherein a manual valve and a bypass valve are respectively arranged before and after the drain valve.
6. The utility model provides a shaft seal overflow steam heat energy recycles device which characterized in that includes:
the low-pressure heater is connected with a shaft seal steam overflow main pipe in the shaft seal steam system;
the first end of the inverted U-shaped bent pipe is connected with the steam adding side of the low-pressure heater, the second end of the inverted U-shaped bent pipe is connected with a branch pipe connected with the shaft seal steam overflow main pipe, and a valve is arranged on the branch pipe; and
and the centralized flash tank and the emptying pipe are connected with the second end of the inverted U-shaped bent pipe through pipelines.
7. The device of claim 6, wherein when the load of the unit corresponding to the shaft seal steam system reaches 50% -70% of the rated load, the valve on the branch pipe is in a closed state; and the shaft seal steam supply valve in the shaft seal steam system is fully closed, and the shaft seal overflow valve is opened, so that the overflow steam is discharged into the condenser.
8. The apparatus of claim 6, wherein the valve in the branch pipe is in an open state when the unit corresponding to the shaft seal steam system is in a stable load operation; and a shaft seal overflow valve on the shaft seal steam overflow main pipe is closed, and a pipeline overflowing to the condenser is isolated, so that the overflow steam is discharged into the low-pressure heater.
9. The apparatus of claim 6, wherein a trap is disposed between the second end of the inverted U-bend and the conduit connecting the centralized flash tank and the evacuation pipe.
10. The device of claim 9, wherein a manual valve and a bypass valve are respectively arranged in front of and behind the drain valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920601773.3U CN210460764U (en) | 2019-04-29 | 2019-04-29 | Shaft seal overflow steam heat energy recycling system and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920601773.3U CN210460764U (en) | 2019-04-29 | 2019-04-29 | Shaft seal overflow steam heat energy recycling system and device |
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| CN210460764U true CN210460764U (en) | 2020-05-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920601773.3U Expired - Fee Related CN210460764U (en) | 2019-04-29 | 2019-04-29 | Shaft seal overflow steam heat energy recycling system and device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111927566A (en) * | 2020-07-03 | 2020-11-13 | 东方电气集团东方汽轮机有限公司 | Shaft seal system for large back pressure steam turbine |
| CN114382558A (en) * | 2021-12-24 | 2022-04-22 | 中国电建集团河南省电力勘测设计院有限公司 | Steam-leakage-dischargeable steam seal heater device and control method thereof |
-
2019
- 2019-04-29 CN CN201920601773.3U patent/CN210460764U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111927566A (en) * | 2020-07-03 | 2020-11-13 | 东方电气集团东方汽轮机有限公司 | Shaft seal system for large back pressure steam turbine |
| CN114382558A (en) * | 2021-12-24 | 2022-04-22 | 中国电建集团河南省电力勘测设计院有限公司 | Steam-leakage-dischargeable steam seal heater device and control method thereof |
| CN114382558B (en) * | 2021-12-24 | 2024-02-13 | 中国电建集团河南省电力勘测设计院有限公司 | Steam seal heater device capable of exhausting steam and control method thereof |
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