CN216841828U - Natural gas peak regulation is waste heat utilization system for power station - Google Patents
Natural gas peak regulation is waste heat utilization system for power station Download PDFInfo
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- CN216841828U CN216841828U CN202123213169.XU CN202123213169U CN216841828U CN 216841828 U CN216841828 U CN 216841828U CN 202123213169 U CN202123213169 U CN 202123213169U CN 216841828 U CN216841828 U CN 216841828U
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Abstract
The utility model relates to the technical field of natural gas peak shaving power stations, in particular to a shutdown waste heat utilization system of a natural gas peak shaving power station, which comprises a waste heat boiler, a gas-liquid separator and a steam turbine shaft seal steam system; the rear section of the waste heat boiler is provided with a low-pressure superheater, after the gas turbine is shut down, the waste heat of the waste heat boiler is moved back to the low-pressure superheater, low-temperature steam in the low-pressure superheater absorbs heat and then is converted into superheated steam, the superheated steam flows into a gas-liquid separator through a steam outlet of the low-pressure superheater, the gas-liquid separator separates liquid in the superheated steam, and the superheated steam after liquid separation flows into a steam turbine shaft seal steam system; during the shutdown period of the gas turbine, the shaft seal steam system maintains the operation, so that the warming-up and the warming-up when the gas turbine is restarted can be avoided; therefore, the utility model discloses a natural gas peak regulation is waste heat utilization system for power station, the waste heat in the exhaust-heat boiler after the gas turbine stops has obtained effective utilization, has avoided the heat waste.
Description
Technical Field
The utility model relates to a natural gas peak regulation power station technical field especially relates to a natural gas peak regulation power station shuts down waste heat utilization system.
Background
At present, world energy is in the third industrial revolution incubation period represented by emerging energy technology, the international development trend of energy towards cleanness, low carbonization and diversification is obviously enhanced, under the new trend that the economy of China enters a new normal state, the energy demand in China is accelerated and slowed down, and the resource environment constraint is continuously strengthened, strategic deployment for promoting energy production and consumption revolution is made in the middle of the party, thirteen-five planning further defines the energy structure adjustment direction, natural gas distributed energy and natural gas peak shaving power stations are vigorously developed, the natural gas consumption proportion is improved, and therefore the natural gas peak shaving power stations are timely and timely.
The gas turbine of the natural gas peak regulation power station needs to be started and stopped quickly according to the scheduling requirement of a power grid, when the gas turbine is stopped, a large amount of waste heat exists in a high-pressure main steam and reheating steam system of a waste heat boiler, the waste heat moves backwards along with the blast effect of a jigger and the wind pulling effect of a chimney, the heat waste can be caused by the backwards moved waste heat, the natural gas peak regulation unit is started and stopped frequently, and the heat waste is obvious.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is: in the existing natural gas peak regulation power station, after a gas turbine is shut down, a large amount of heat in a waste heat boiler is accumulated and moved backwards, so that a large amount of heat is wasted.
In order to solve the technical problem, the utility model provides a natural gas peak regulation is waste heat utilization system for power station, including exhaust-heat boiler, vapour and liquid separator, steam turbine bearing seal steam system; and the rear section of the waste heat boiler is provided with a low-pressure superheater, a steam outlet of the low-pressure superheater is communicated with a steam inlet of the gas-liquid separator, and a steam outlet of the gas-liquid separator is communicated with the steam turbine shaft seal steam system.
As a preferred scheme, the waste heat utilization system for the natural gas peak regulation power station further comprises an air heater, a controller and a temperature sensor; the steam outlet of the gas-liquid separator is connected with the steam inlet of the air heater, the steam outlet of the air heater is connected with the steam turbine shaft seal steam system, and the temperature sensor is arranged at the steam outlet of the air heater; the temperature sensor and the air heater are both electrically connected with the controller.
As a preferred scheme, the waste heat utilization system for the natural gas peak-shaving power station further comprises a first pipeline, a water storage container and a steam trap; one end of the first pipeline is connected with a liquid outlet of the gas-liquid separator, the other end of the first pipeline is connected with the water storage container, and the steam trap is arranged on the first pipeline.
Preferably, the waste heat utilization system for the natural gas peak shaver power station further comprises a first stop valve and a second stop valve, the first stop valve and the second stop valve are both arranged on the first pipeline, the first stop valve is arranged between the steam trap and the gas-liquid separator, and the second stop valve is arranged between the steam trap and the water storage container.
Preferably, the natural gas peak shaving power station waste heat utilization system further comprises a second pipeline and a third stop valve arranged on the second pipeline, and the second pipeline communicates the liquid outlet of the gas-liquid separator with the water storage container.
As a preferred scheme, the waste heat utilization system for the natural gas peak shaving power station further comprises a third pipeline, a fourth pipeline, a fifth pipeline, an auxiliary steam system, a first control valve and a second control valve; the gas-liquid separator and the air heater are both arranged on the third pipeline, the third pipeline is communicated with the steam turbine shaft seal steam system, the third pipeline is communicated with a steam outlet of the low-pressure superheater through the fourth pipeline, and the first control valve (31) is arranged on the fourth pipeline;
the auxiliary steam system is communicated with the steam turbine shaft seal steam system through the fifth pipeline, and the second control valve is arranged on the fifth pipeline.
As a preferable scheme, the waste heat utilization system for the natural gas peak shaving power station further comprises a sixth pipeline, a seventh pipeline and a third control valve arranged on the seventh pipeline;
the first end of the sixth pipeline is connected with the second end of the fourth pipeline and the second end of the fifth pipeline, the first end of the fourth pipeline is connected with the low-pressure superheater, and the first end of the fifth pipeline is connected with the auxiliary steam system;
and the second end of the sixth pipeline is connected with the first end of the third pipeline and the first end of the seventh pipeline, and the second end of the third pipeline and the second end of the seventh pipeline are both connected with the steam system of the steam turbine shaft seal.
Preferably, a pressure regulating valve is arranged on the fifth pipeline, and the pressure regulating valve is arranged between the second control valve and the sixth pipeline.
Preferably, a fourth control valve is further disposed on the third pipeline, and the fourth control valve is disposed between the gas-liquid separator and the sixth pipeline.
Preferably, a fifth control valve is further disposed on the third pipeline, and the fifth control valve is disposed at a steam outlet of the air heater.
The utility model discloses a natural gas peak regulation is waste heat utilization system for power station compares with prior art, and its beneficial effect lies in:
the utility model discloses a natural gas peak regulation is waste heat utilization system for power station, exhaust-heat boiler's back end is equipped with the low pressure over heater, after gas turbine stopped transport, exhaust-heat boiler's waste heat moves back to low pressure over heater department, low temperature steam in the low pressure over heater absorbs the heat and turns into superheated steam, superheated steam flows into vapour and liquid separator through the steam outlet of low pressure over heater, vapour and liquid separator is with the liquid separation in the superheated steam, superheated steam after the separation liquid flows into steam turbine bearing seal steam system, maintain steam turbine bearing seal steam system's operation; during the shutdown period of the gas turbine, the shaft seal steam system keeps running, and the warming-up and warming-up of the gas turbine can be avoided when the gas turbine is restarted; therefore, the utility model discloses a natural gas peak regulation is waste heat utilization system for power station, the waste heat in the exhaust-heat boiler after the gas turbine stops has obtained effective utilization, has avoided the heat waste.
Drawings
Fig. 1 is the utility model discloses natural gas peak regulation is waste heat utilization system for power station's structural schematic.
In the figure, 1, a waste heat boiler; 2. a gas-liquid separator; 3. an air heater; 4. a steam turbine shaft seal steam system; 5. a low pressure superheater; 6. a temperature sensor; 7. a water storage container; 8. a steam trap; 9. an auxiliary steam system; 11. a first conduit; 12. a second pipe; 13. a third pipeline; 14. a fourth conduit; 15. a fifth pipeline; 16. a sixth pipeline; 17. a seventh pipe; 21. A first shut-off valve; 22. a second stop valve; 23. a third stop valve; 31. a first control valve; 32. a second control valve; 33. a third control valve; 34. a fourth control valve; 35. a fifth control valve; 36. a pressure regulating valve;
Detailed Description
The following detailed description of the embodiments of the present invention is made with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "top", "bottom", and the like indicate orientations or positional relationships based on those 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 particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention. It should be understood that the terms "first", "second", etc. are used herein to describe various information, but the information should not be limited to these terms, and these terms are only used to distinguish one type of information from another. For example, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information, without departing from the scope of the present invention.
As shown in fig. 1, the preferred embodiment of the waste heat utilization system for the natural gas peak shaving power station of the present invention comprises a waste heat boiler 1, a gas-liquid separator 2, and a steam turbine shaft seal steam system 4; the rear section of the waste heat boiler 1 is provided with a low-pressure superheater 5, a steam outlet of the low-pressure superheater 5 is communicated with a steam inlet of the gas-liquid separator 2, and a steam outlet of the gas-liquid separator 2 is communicated with a steam turbine shaft seal steam system 4.
Specifically, after the gas turbine is shut down, the waste heat of the waste heat boiler 1 is moved to the low-pressure superheater 5, low-temperature steam in the low-pressure superheater 5 absorbs heat and then is converted into superheated steam, the superheated steam flows into the gas-liquid separator 2 through a steam outlet of the low-pressure superheater 5, the gas-liquid separator 2 separates liquid in the superheated steam, the superheated steam after liquid separation flows into the steam system 4 for the steam turbine shaft seal, and the operation of the steam system 4 for the steam turbine shaft seal is maintained; during the shutdown period of the gas turbine, the shaft seal steam system 4 keeps running, and the warming-up and warming-up of the gas turbine when the gas turbine is restarted can be avoided; therefore, the utility model discloses a natural gas peak regulation is waste heat utilization system for power station, gas turbine shut down the back, and waste heat in the exhaust-heat boiler has obtained effective utilization, has avoided the heat waste. In addition, the waste heat in the waste heat boiler is absorbed by the low-pressure superheater 5, and the overtemperature and overpressure of a condensed water heater or a low-pressure main steam system caused by the fact that the high-pressure main steam and the reheat steam system store heat and move to the low-pressure main steam system after the gas turbine is stopped can be avoided. In addition, it should be noted that, in this embodiment, heat is provided to the steam turbine shaft seal steam system 4 through the low-pressure superheater 5, and compared with heat is provided to the steam turbine shaft seal steam system 4 through the high-pressure or medium-pressure steam drum of the waste heat boiler, the following advantages are provided, because the pressure of the steam turbine shaft seal steam system 4 is low, when heat is provided to the steam turbine shaft seal steam system 4 through the high-pressure or medium-pressure steam drum of the waste heat boiler, the high-pressure or medium-pressure system and the low-pressure system are connected in series, overpressure of the low-pressure system is easily caused, and potential safety hazards exist; in this embodiment, heat is provided to the steam turbine shaft seal steam system 4 through the low-pressure superheater 5, so that overpressure of the low-pressure system can be avoided.
The superheat degree of the steam flowing out of the low-pressure superheater 5 can be gradually reduced along with the consumption of the waste heat in the waste heat boiler, and after the superheat degree of the steam flowing out of the low-pressure superheater 5 is reduced to a certain value, the superheat degree of the steam cannot meet the steam utilization requirement of a steam turbine shaft seal steam system 4; the steam outlet of the gas-liquid separator 2 is connected with the steam inlet of the air heater, the steam outlet of the air heater is connected with the steam system 4 of the steam turbine shaft seal, and the temperature sensor 6 is arranged at the steam outlet of the air heater 3; the temperature sensor 6 and the air heater 3 are both electrically connected to the controller. The temperature sensor 6 is used for detecting the steam temperature at the steam inlet of the steam system 4 of the steam turbine shaft seal, when the temperature of the steam is lower than a set value, the air heater 3 is started, and the heating value of the steam temperature meets the requirement, so that the superheat degree requirement of the steam is realized.
When the superheat degree of the steam flowing out of the low-pressure superheater 5 is low, the steam is easy to drain, if water cannot be discharged in time, noise is easy to generate after the water and the steam are mixed, and the pipeline is easy to vibrate at the same time, in the embodiment, the waste heat utilization system for the natural gas peak shaving power station further comprises a first pipeline 11, a water storage container 7 and a steam trap 8; one end of the first pipeline 11 is connected with the liquid outlet of the gas-liquid separator 2, the other end of the first pipeline 11 is connected with the water storage container 7, and the steam trap 8 is arranged on the first pipeline. The gas-liquid separator 2 separates the liquid in the steam, and the steam trap 8 can discharge the liquid separated from the gas-liquid separator 2 to the water storage container 7 while avoiding leakage of the steam.
In this embodiment, the natural gas peak shaving power plant waste heat utilization system further includes a first stop valve 21 and a second stop valve 22, the first stop valve 21 and the second stop valve 22 are both disposed on the first pipeline 11, the first stop valve 21 is disposed between the steam trap 8 and the gas-liquid separator 2, and the second stop valve 22 is disposed between the steam trap 8 and the water storage container 7. When the steam trap 8 needs to be serviced, the first stop valve 21 and the second stop valve 22 may be closed.
Further, the natural gas peak regulation power station waste heat utilization system further comprises a second pipeline 12 and a third stop valve 23 arranged on the second pipeline 12, and a liquid outlet of the gas-liquid separator 2 is communicated with the water storage container 7 through the second pipeline 12. When the steam trap 8 needs to be maintained, the first stop valve 21 and the second stop valve 22 are closed, and the third stop valve 23 is opened, so that the normal operation of the gas-liquid separator can be maintained, and the stop caused by the maintenance of the steam trap can be avoided.
When the gas turbine is shut down for a long time, the waste heat in the waste heat boiler cannot meet the gas demand of the steam system 4 for the shaft seal of the steam turbine during the whole shutdown period, in this embodiment, the waste heat utilization system for the natural gas peak shaving power station further comprises a third pipeline 13, a fourth pipeline 14, a fifth pipeline 15, an auxiliary steam system 9, a first control valve 31 and a second control valve 32; the gas-liquid separator 2 and the air heater 3 are both arranged on a third pipeline 13, the third pipeline 13 is communicated with a steam turbine shaft seal steam system 4, the third pipeline 13 is communicated with a steam outlet of the low-pressure superheater 5 through a fourth pipeline 14, and the first control valve 31 is arranged on the fourth pipeline 14; the auxiliary steam system 9 is in communication with the turbine shaft seal steam system 4 via a fifth conduit 15, and a second control valve 32 is provided on the fifth conduit 15. When the waste heat in the waste heat boiler can not meet the gas demand of the steam turbine shaft seal steam system 4, steam is supplied to the steam turbine shaft seal steam system 4 through the auxiliary steam system 9, so that the stable operation of the steam turbine shaft seal steam system 4 is ensured.
Specifically, the waste heat utilization system for the natural gas peak shaving power station further comprises a sixth pipeline 16, a seventh pipeline 17 and a third control valve 33 arranged on the seventh pipeline 17; a first end of the sixth pipeline 16 is connected with a second end of the fourth pipeline 14 and a second end of the fifth pipeline 15, a first end of the fourth pipeline 14 is connected with the low-pressure superheater 5, and a first end of the fifth pipeline 15 is connected with the auxiliary steam system 9; the second end of the sixth pipeline 16 is connected to the first end of the third pipeline 13 and the first end of the seventh pipeline 17, and both the second end of the third pipeline 13 and the second end of the seventh pipeline 17 are connected to the steam turbine shaft seal steam system 4. The sixth duct 16 serves as a common duct, and construction costs can be reduced.
In the present embodiment, the first control valve 31, the second control valve 32, and the third control valve 33 are all electric control valves electrically connected to a controller, and when the low pressure superheater 5 is used to supply steam to the steam turbine shaft seal steam system 4, the controller closes the second control valve 32 and the third control valve 33, and opens the first control valve 31; when the auxiliary steam system 9 is used to supply steam to the turbine gland seal steam system 4, the second control valve 32 and the third control valve 33 are opened by the controller, and the first control valve 31 is closed.
In the present embodiment, the fifth pipe 15 is provided with a pressure regulating valve 36, and the pressure regulating valve 36 is arranged between the second control valve 32 and the sixth pipe 16. The pressure regulating valve 36 can regulate the gas and liquid of the steam in the fifth pipeline 15, so as to ensure the stability of supplying the steam to the steam turbine shaft seal steam system 4 by the auxiliary steam system 9; wherein the pressure regulating valve 36 is electrically connected to the controller.
Further, a fourth control valve 34 is provided in the third conduit 13, and the fourth control valve 34 is disposed between the gas-liquid separator 2 and the sixth conduit 16. When the gas-liquid separator 2 or the air heater 3 needs to be overhauled, the fourth control valve 34 is closed, and the second control valve 32 and the third control valve 33 are opened; the fourth control valve 34 may be a manual control valve, such as a butterfly valve, and in this embodiment, the fourth control valve 34 is an electric control valve electrically connected to the controller.
In this embodiment, the third pipeline 13 is further provided with a fifth control valve 35, the fifth control valve 35 is disposed at a steam outlet of the air heater 3, and when the gas-liquid separator 2 or the air heater 3 needs to be overhauled, the fifth control valve 35 is closed at the same time, so that steam of the auxiliary steam system 9 can be prevented from flowing into the third pipeline 13, and stability of steam supply pressure from the auxiliary steam system 9 to the steam turbine shaft seal steam system 4 is further ensured. The fifth control valve 35 may be a manual control valve, such as a butterfly valve, and in this embodiment, the fifth control valve 35 is an electric control valve electrically connected to the controller.
The utility model discloses a working process does: after the gas turbine stops operating, the waste heat of the waste heat boiler 1 is moved to the low-pressure superheater 5, the low-temperature steam in the low-pressure superheater 5 absorbs heat and then is converted into superheated steam, the superheated steam flows into the gas-liquid separator 2 through a steam outlet of the low-pressure superheater 5, the gas-liquid separator 2 separates liquid in the superheated steam, the superheated steam after liquid separation flows into the steam system 4 of the steam turbine shaft seal, and the operation of the steam system 4 of the steam turbine shaft seal is maintained.
To sum up, the embodiment of the utility model provides a natural gas peak regulation is waste heat utilization system for power station, it absorbs the gas several rounds of waste heat boiler 1 after shutting down the interior waste heat through low-pressure over heater 5 to provide the superheated steam of waste heat conversion line for steam turbine bearing seal steam system 4, maintain the operation of steam turbine bearing seal steam system 4, during the gas turbine shut down, shaft seal steam system 4 maintains the operation, warm-up, the warm-up pipe when can avoiding gas turbine to start once more; therefore, the waste heat utilization system for the natural gas peak shaving power station effectively utilizes the waste heat in the waste heat boiler after the gas turbine is shut down, and avoids heat waste; in addition, the waste heat in the waste heat boiler is absorbed by the low-pressure superheater 5, and the overtemperature and overpressure of a condensed water heater or a low-pressure main steam system caused by the fact that the high-pressure main steam and the reheat steam system store heat and move to the low-pressure main steam system after the gas turbine is stopped can be avoided.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and replacements can be made without departing from the technical principle of the present invention, and these modifications and replacements should also be regarded as the protection scope of the present invention.
Claims (10)
1. A waste heat utilization system for a natural gas peak shaving power station is characterized by comprising a waste heat boiler (1), a gas-liquid separator (2) and a steam turbine shaft seal steam system (4); the rear section of the waste heat boiler (1) is provided with a low-pressure superheater (5), a steam outlet of the low-pressure superheater (5) is communicated with a steam inlet of the gas-liquid separator (2), and a steam outlet of the gas-liquid separator (2) is communicated with the steam turbine shaft seal steam system (4).
2. The waste heat utilization system for the natural gas peak shaver power station as claimed in claim 1, characterized in that the waste heat utilization system for the natural gas peak shaver power station further comprises an air heater (3), a controller, a temperature sensor (6); a steam outlet of the gas-liquid separator (2) is connected with a steam inlet of the air heater (3), a steam outlet of the air heater (3) is connected with the steam turbine shaft seal steam system (4), and the temperature sensor (6) is arranged at the steam outlet of the air heater (3); the temperature sensor (6) and the air heater (3) are both electrically connected with the controller.
3. The waste heat utilization system for natural gas peak shaver power plants as claimed in claim 1, characterized in that it further comprises a first pipeline (11), a water storage container (7), a steam trap (8); one end of the first pipeline (11) is connected with a liquid outlet of the gas-liquid separator (2), the other end of the first pipeline (11) is connected with the water storage container (7), and the steam trap (8) is arranged on the first pipeline (11).
4. The waste heat utilization system for a natural gas peak shaver power station as set forth in claim 3, characterized in that the waste heat utilization system for a natural gas peak shaver power station further comprises a first stop valve (21), a second stop valve (22), the first stop valve (21) and the second stop valve (22) are both provided on the first pipe (11), and the first stop valve (21) is arranged between the steam trap (8) and the gas-liquid separator (2), and the second stop valve (22) is arranged between the steam trap (8) and the water storage container (7).
5. The waste heat utilization system for the natural gas peak shaver power station as claimed in claim 4, characterized in that the waste heat utilization system for the natural gas peak shaver power station further comprises a second pipeline (12) and a third stop valve (23) arranged on the second pipeline (12), wherein the second pipeline (12) communicates the liquid outlet of the gas-liquid separator (2) with the water storage container (7).
6. The waste heat utilization system for the natural gas peak shaver power station as claimed in claim 2, characterized in that the waste heat utilization system for the natural gas peak shaver power station further comprises a third pipeline (13), a fourth pipeline (14), a fifth pipeline (15), an auxiliary steam system (9), a first control valve (31), a second control valve (32); the gas-liquid separator (2) and the air heater (3) are both arranged on a third pipeline (13), the third pipeline (13) is communicated with the steam turbine shaft seal steam system (4), the third pipeline (13) is communicated with a steam outlet of the low-pressure superheater (5) through a fourth pipeline (14), and the first control valve (31) is arranged on the fourth pipeline (14);
the auxiliary steam system (9) is communicated with the steam turbine shaft seal steam system (4) through the fifth pipeline (15), and the second control valve (32) is arranged on the fifth pipeline (15).
7. The waste heat utilization system for a natural gas peak shaver power station as claimed in claim 6, characterized in that it further comprises a sixth pipeline (16), a seventh pipeline (17), a third control valve (33) arranged on the seventh pipeline (17);
a first end of the sixth pipeline (16) is connected with a second end of the fourth pipeline (14) and a second end of the fifth pipeline (15), a first end of the fourth pipeline (14) is connected with the low-pressure superheater (5), and a first end of the fifth pipeline (15) is connected with the auxiliary steam system (9);
and the second end of the sixth pipeline (16) is connected with the first end of the third pipeline (13) and the first end of the seventh pipeline (17), and the second end of the third pipeline (13) and the second end of the seventh pipeline (17) are both connected with the steam turbine shaft seal steam system (4).
8. The residual heat utilization system for natural gas peak shaver power plants as claimed in claim 7, characterized in that a pressure regulating valve (36) is provided on the fifth pipeline (15), the pressure regulating valve (36) being arranged between the second control valve (32) and the sixth pipeline (16).
9. The waste heat utilization system for natural gas peak shaving power plants according to claim 7, characterized in that a fourth control valve (34) is further provided on the third pipeline (13), the fourth control valve (34) being arranged between the gas-liquid separator (2) and the sixth pipeline (16).
10. The waste heat utilization system for the natural gas peak shaving power plant according to claim 9, characterized in that a fifth control valve (35) is further arranged on the third pipeline (13), and the fifth control valve (35) is arranged at a steam outlet of the air heater (3).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202123213169.XU CN216841828U (en) | 2021-12-16 | 2021-12-16 | Natural gas peak regulation is waste heat utilization system for power station |
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| CN202123213169.XU CN216841828U (en) | 2021-12-16 | 2021-12-16 | Natural gas peak regulation is waste heat utilization system for power station |
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| CN202123213169.XU Active CN216841828U (en) | 2021-12-16 | 2021-12-16 | Natural gas peak regulation is waste heat utilization system for power station |
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