CN114963275B - Coal-fired heat supply unit - Google Patents
Coal-fired heat supply unit Download PDFInfo
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- CN114963275B CN114963275B CN202210440410.2A CN202210440410A CN114963275B CN 114963275 B CN114963275 B CN 114963275B CN 202210440410 A CN202210440410 A CN 202210440410A CN 114963275 B CN114963275 B CN 114963275B
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- temperature water
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 205
- 238000010438 heat treatment Methods 0.000 claims abstract description 50
- 238000004146 energy storage Methods 0.000 claims abstract description 26
- 239000008236 heating water Substances 0.000 claims abstract description 16
- 238000001816 cooling Methods 0.000 claims description 48
- 238000005485 electric heating Methods 0.000 claims description 27
- 238000004891 communication Methods 0.000 claims description 9
- 239000003245 coal Substances 0.000 claims 2
- 230000002457 bidirectional effect Effects 0.000 abstract description 3
- 238000012546 transfer Methods 0.000 description 12
- 238000001914 filtration Methods 0.000 description 3
- 230000008676 import Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
- F24D3/1058—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system disposition of pipes and pipe connections
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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
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- 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
- F01K13/00—General layout or general methods of operation of complete plants
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D2200/00—Heat sources or energy sources
- F24D2200/06—Solid fuel fired boiler
- F24D2200/062—Coal fired boilers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/14—Combined heat and power generation [CHP]
Abstract
The present disclosure relates to a coal-fired heating unit, the coal-fired heating unit comprising: the system comprises a steam turbine, a generator, a condenser, an electric heat pump, a water tank assembly, a heat supply and exchange station and a flywheel energy storage device; the steam turbine is used for being connected with the boiler, the generator is connected with the steam turbine, the condenser is connected with the exhaust steam end of the steam turbine, and exhaust steam generated by the steam turbine is used for being discharged into the condenser; the electric heat pump is connected with the condenser, the electric heat pump is used for collecting heat of exhaust steam in the condenser, the water tank assembly is connected with the electric heat pump, the electric heat pump is used for heating water in the water tank assembly, the water tank assembly is connected with the heat supply and heat exchange station, and the heat supply and heat exchange station is used for collecting heat of water in the water tank assembly to realize heat supply; the flywheel energy storage device is electrically connected with the motor and is used for storing part of electric energy generated by the generator. The coal-fired heat supply unit greatly improves the adjustment flexibility of the coal-fired heat supply unit through bidirectional adjustment of the thermal load and the electric load.
Description
Technical Field
The disclosure relates to the technical field of thermal power generation, in particular to a coal-fired heat supply unit.
Background
The coal-fired thermal generator set mainly comprises a generator set operated by a simple steam turbine and a heat supply unit adopting a heat and power co-generation mode, wherein the heat and power co-generation heat supply unit is mainly used in the north, and the heat and power co-generation heat supply unit adopts a fuel to simultaneously generate electric energy and heat energy, so that heat supply and power supply are in a coupling state.
However, the current cogeneration heating unit has poor flexibility of power grid peak shaving capacity due to the coupling relation of the heat load and the electric load, is not beneficial to carrying out power grid peak shaving, and does not meet the requirement of current power grid development.
Disclosure of Invention
The purpose of the present disclosure is to provide a coal-fired heating unit to solve the problem of poor flexibility of the peak shaving capacity of the power grid of the current cogeneration heating unit.
To achieve the above object, the present disclosure provides a coal-fired heating unit comprising: the system comprises a steam turbine, a generator, a condenser, an electric heat pump, a water tank assembly, a heat supply and exchange station and a flywheel energy storage device;
the steam turbine is used for being connected with a boiler, the generator is connected with the steam turbine, the condenser is connected with the exhaust steam end of the steam turbine, and exhaust steam generated by the steam turbine is used for being discharged into the condenser;
the electric heating pump is connected with the condenser, the electric heating pump is used for collecting heat of exhaust steam in the condenser, the water tank assembly is connected with the electric heating pump, the electric heating pump is used for heating water in the water tank assembly, the water tank assembly is connected with the heat supply and heat exchange station, and the heat of the water in the water tank assembly is used for being transferred to the heat supply and heat exchange station to realize heat supply;
the flywheel energy storage device is electrically connected with the generator and is used for storing part of electric energy generated by the generator.
Optionally, the electric heating pump is electrically connected with the electricity, and the electric energy generated by the generator is used for driving the electric heating pump.
Optionally, the coal-fired heating unit further comprises a circulating pump, the condenser is provided with a drain pipe and a water return pipe, the circulating pump is connected to the water return pipe, the electric heating pump is provided with a heat taking inlet and a heat taking outlet, one end of the drain pipe, which is far away from the condenser, is communicated with the heat taking inlet, and one end of the water return pipe, which is far away from the condenser, is communicated with the heat taking outlet.
Optionally, the coal-fired heat supply unit further comprises a cooling tower, the cooling tower is provided with a cooling inlet and a cooling outlet, one end of the drain pipe, which is far away from the condenser, is communicated with the cooling inlet, and one end of the return pipe, which is far away from the condenser, is communicated with the cooling outlet.
Optionally, the water tank assembly includes high temperature water tank and low temperature water tank, the high temperature water tank with the well pressure jar of steam turbine is connected, the high temperature water tank is used for collecting the heat of the interior steam of well pressure jar of steam turbine is to the water heating of storage, the low temperature water tank with the electric heat pump is connected, the heat that the electric heat pump collected is used for right the water heating that the low temperature water tank stored, the high temperature water tank with adopt the heat transfer pipeline assembly to connect between the low temperature water tank, the heat in the high temperature water tank is used for right the water heating that the low temperature water tank stored, the low temperature water tank with the heat supply heat exchange station is connected, so that the heat supply heat exchange station is collected the heat of the low temperature water tank normal water realizes the heat supply.
Optionally, the heat exchange pipeline assembly includes first pipeline, second pipeline and water pump, first pipeline with the second pipeline connect in the low temperature water tank, have first heat exchanger on the high temperature water tank, first heat exchanger has first heat transfer import and first heat transfer export, first pipeline keep away from the one end of low temperature water tank with first heat transfer import intercommunication, the second pipeline keep away from the one end of low temperature water tank with first heat transfer export intercommunication, the water pump connect in first pipeline or second pipeline.
Optionally, a third pipeline and a fourth pipeline are arranged on the low-temperature water tank, the electric heating pump is provided with a heating inlet and a heating outlet, one end, far away from the low-temperature water tank, of the third pipeline is communicated with the heating outlet, one end, far away from the low-temperature water tank, of the fourth pipeline is communicated with the water inlet end of the heat supply heat exchange station, and the water outlet end of the heat supply heat exchange station is communicated with the heating inlet through a fifth pipeline.
Optionally, the coal-fired heat supply unit further comprises a deaerator, the deaerator is connected to the steam turbine, the high-temperature water tank is provided with a second heat exchanger, the second heat exchanger is provided with a second heat exchange inlet and a second heat exchange outlet, the second heat exchange inlet is communicated with the medium-pressure cylinder of the steam turbine, and the second heat exchange outlet is communicated with the deaerator.
Optionally, the temperature of the water in the high-temperature water tank is 200-300 ℃; the temperature of the water in the low-temperature water tank is 100-130 ℃.
Optionally, the flywheel energy storage device comprises a flywheel, an electric motor and a power electronic device, wherein the power electronic device is electrically connected with the electric motor, the electric motor is connected with the power electronic device, the electric motor and the power electronic device are used for converting electric energy into mechanical energy, the flywheel is connected with the electric motor, and the flywheel is used for storing or releasing the mechanical energy.
Through the technical scheme, decoupling between the electric load and the thermal load of the coal-fired heat supply unit can be realized through the arranged electric heat pump, the thermoelectric ratio of the coal-fired heat supply unit is enlarged, the lowest operation load of the coal-fired heat supply unit is reduced, the adjustment range of the thermal load is enlarged, and the requirement of the minimum operation load of the coal-fired heat supply unit can be met, so that the flexibility of the coal-fired heat supply unit is improved. The flywheel energy storage device can be used for adjusting the electric load, and the adjustment range of the lifting speed of the electric load is increased. The coal-fired heat supply unit can meet the requirements of the coal-fired heat supply unit under different working conditions through bidirectional adjustment of the heat load and the electric load, greatly improves the adjustment flexibility of the coal-fired heat supply unit, increases the application range, combines the electric heat pump and the flywheel energy storage device, and reduces the power requirement of the electric heat pump. In addition, the flywheel energy storage device also has a filtering function, so that the frequency modulation of the coal-fired heat supply unit can be assisted, and flexible power supply is realized.
Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:
fig. 1 is a schematic diagram of a coal-fired heating unit according to an embodiment of the present disclosure.
Description of the reference numerals
1. A steam turbine; 2. a generator; 3. a deaerator; 4. a condenser; 5. a cooling tower; 6. a circulation pump; 7. an electric heat pump; 8. a power electronic device; 9. a motor; 10. a flywheel; 11. a high temperature water tank; 12. a booster station; 13. a heat supply and exchange station; 14. low Wen Shuiguan; 15. a water pump; 16. a drain pipe; 17. a water return pipe; 18. a first pipe; 19. a second pipe; 20. a third conduit; 21. a fourth conduit; 22. and a fifth pipeline.
Detailed Description
Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.
In the present disclosure, unless otherwise indicated, terms of orientation such as "upper, lower, left, right" are used generally in the direction of the drawing figures, and "inner, outer" refer to the inner, outer of the relevant parts. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
In the description of the present disclosure, it should also be noted that, unless explicitly stated and limited otherwise, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this disclosure will be understood by those of ordinary skill in the art in the specific context.
As shown in fig. 1, the present disclosure provides a coal-fired heating unit, comprising: the device comprises a steam turbine 1, a generator 2, a condenser 4, an electric heating pump 7, a water tank assembly, a heat supply and exchange station 13 and a flywheel energy storage device.
The steam turbine 1 is used for being connected with the boiler, and generator 2 is connected in steam turbine 1, and condenser 4 is connected with the exhaust steam end of steam turbine 1, and the exhaust steam that steam turbine 1 produced is used for discharging into condenser 4.
The electric heat pump 7 is connected with the condenser 4, and the electric heat pump 7 is used for collecting the heat of exhaust steam in the condenser 4, and the water pitcher subassembly is connected with the electric heat pump 7, and the electric heat pump 7 is used for heating the water in the water pitcher subassembly, and the water pitcher subassembly is connected with heat supply heat exchange station 13, and the heat of water pitcher subassembly normal water is used for transferring to heat supply heat exchange station 13 and realizes the heat supply.
The flywheel energy storage device is electrically connected with the generator 2 and is used for storing part of electric energy generated by the generator 2.
Wherein, the steam generated by the boiler can enter the steam turbine 1 for driving the steam turbine 1 to rotate. The steam turbine 1 is used for driving the generator 2 to generate electricity. The steam generated by the boiler forms exhaust steam after passing through the steam turbine 1, and enters the condenser 4 from the exhaust steam end for cooling, and returns to the boiler for reheating and evaporation, so that the recycling is realized.
The electric heat pump 7 can collect heat generated by cooling exhaust steam in the condenser 4, and heat water in the water tank assembly through the electric heat pump 7 so as to adjust the heat load of the coal-fired heat supply unit. The water tank assembly is used for storing water, so that heat transfer is realized, and the heat supply and heat exchange station 13 is used for heat exchange, so that heat supply is realized.
The flywheel energy storage device can store part of electric energy generated by the generator 2 so as to release the electric energy when the electric load is required to be increased, the electric energy requirement is made up, and the lifting speed of the electric load can be effectively regulated through the flywheel energy storage device, so that the power of the generator 2 meets the requirement of the electric load.
In the technical scheme, the decoupling between the electric load and the thermal load of the coal-fired heat supply unit can be realized through the arranged electric heating pump 7, the thermoelectric ratio of the coal-fired heat supply unit is enlarged, the lowest operation load of the coal-fired heat supply unit is reduced, the adjustment range of the thermal load is enlarged, and the requirement of the minimum operation load of the coal-fired heat supply unit can be met, so that the flexibility of the coal-fired heat supply unit is improved. The flywheel energy storage device can be used for adjusting the electric load, and the adjustment range of the lifting speed of the electric load is increased. The coal-fired heat supply unit can meet the requirements of the coal-fired heat supply unit under different working conditions through bidirectional adjustment of the heat load and the electric load, greatly improves the adjustment flexibility of the coal-fired heat supply unit, increases the application range, simultaneously combines the electric heat pump 7 with the flywheel energy storage device, and reduces the power requirement of the electric heat pump 7. In addition, the flywheel energy storage device also has a filtering function, so that the frequency modulation of the coal-fired heat supply unit can be assisted, and flexible power supply is realized.
Alternatively, in one embodiment of the present disclosure, the coal-fired heating unit includes a booster station 12, the booster station 12 being connected to the generator 2. Most of the electric energy generated by the generator 2 is transmitted to the booster station 12, and boosted by the booster station 12, so that long-distance transmission is realized. While a small portion of the electrical energy generated by the generator 2 is stored by the flywheel energy storage device.
Alternatively, in one embodiment of the present disclosure, the electric heat pump 7 is electrically connected to the generator 2, and the electric energy generated by the generator 2 is used to drive the electric heat pump 7.
In this embodiment, the electric energy generated by the generator 2 is used to drive the electric heat pump 7 to operate, so that the electric heat pump 7 can collect heat from the condenser 4, and the electric energy generated by the generator 2 is used to supply power, so that the electric heat pump 7 does not need to consume other electric energy additionally, and other electric energy consumption is saved.
Optionally, in an embodiment of the disclosure, the coal-fired heating unit further includes a circulating pump 6, the condenser 4 has a drain pipe 16 and a return pipe 17, the circulating pump 6 is connected to the return pipe 17, the electric heat pump 7 has a heat-taking inlet and a heat-taking outlet, one end of the drain pipe 16 away from the condenser 4 is communicated with the heat-taking inlet, and one end of the return pipe 17 away from the condenser 4 is communicated with the heat-taking outlet.
In this embodiment, the condenser 4 has cooling circulating water therein, exhaust steam entering the condenser 4 exchanges heat with the cooling circulating water, the cooling circulating water is discharged through the drain pipe 16 after being heated, and enters the electric heating pump 7 through the heat-collecting inlet, low-grade heat in the cooling circulating water is collected by the electric heating pump 7, and the cooling circulating water enters the water return pipe 17 from the heat-collecting outlet after being collected in the electric heating pump 7, and then flows back to the condenser 4, thereby forming a circulation loop.
The circulating pump 6 is used for generating driving force, and the circulating pump 6 drives the cooling circulating water in the water return pipe 17 to continuously return to the condenser 4, so that the heated cooling circulating water in the condenser 4 also continuously enters the drain pipe 16. The circulation of the cooling circulation water can be ensured by the circulation pump 6.
In the embodiment, the cooling circulating water with heat is conveyed to the electric heat pump 7 through the water discharge pipe 16, so that the electric heat pump 7 can conveniently collect the heat in the exhaust steam indirectly by drawing the heat of the cooling circulating water.
Optionally, in one embodiment of the disclosure, the coal-fired heating unit further includes a cooling tower 5, the cooling tower 5 has a cooling inlet and a cooling outlet, an end of the drain pipe 16 away from the condenser 4 is communicated with the cooling inlet, and an end of the return pipe 17 away from the condenser 4 is communicated with the cooling outlet.
In this embodiment, the amount of the cooling circulating water in the condenser 4 is large, and part of the cooling circulating water which cannot enter the electric heating pump 7 can enter the cooling tower 5, be rapidly cooled by the cooling tower 5, and return to the condenser 4, so as to ensure the normal operation of the boiler.
Wherein, the one end that drain pipe 16 kept away from condenser 4 forms two branches, respectively with cooling inlet and get hot import intercommunication, realize cooling tower 5 and electric heat pump 7 parallelly connected. And the end of the water return pipe 17 far away from the condenser 4 is also provided with two branches which are respectively communicated with the cooling outlet and the heat extraction outlet, so that a circulation loop is also formed between the cooling tower 5 and the condenser 4.
Optionally, in one embodiment of the present disclosure, the water tank assembly includes a high temperature water tank Wen Shuiguan and a low temperature water tank 14, the high temperature water tank 11 is connected to the intermediate pressure cylinder of the steam turbine 1, the high temperature water tank Wen Shuiguan is used for collecting heat of steam in the intermediate pressure cylinder of the steam turbine 1 to heat stored water, the low temperature water tank 14 is connected to the electric heating pump 7, the heat collected by the electric heating pump 7 is used for heating water stored in the low temperature water tank 14, the high temperature water tank 11 is connected to the low temperature water tank 14 by a heat exchange pipeline assembly, and the heat in the high temperature water tank 11 is used for heating water stored in the low temperature water tank 14, and the low temperature water tank 14 is connected to the heat supply heat exchange station 13, so that the heat supply heat exchange station 13 collects heat of water in the low temperature water tank 14 to realize heat supply.
In this embodiment, the temperature of the steam in the intermediate pressure cylinder of the steam turbine 1 is high, the high-temperature water tank 11 can collect heat of the steam in the intermediate pressure cylinder of the steam turbine 1, and the heat collected by the high-temperature water tank 11 can be used for heating water in the low-temperature water tank 14 to realize heat supply by the heat supply and exchange station 13.
Specifically, the high-temperature water tank 11 stores therein heating water, and the low-temperature water tank 14 stores therein heating backwater, wherein the heating water is used for transferring heat of steam in the medium-pressure cylinder of the steam turbine 1 to the heating backwater.
It can be understood that the heat of the heat supply backwater in the low-temperature water tank 14 is firstly heated by the heat collected by the electric heat pump 7, and then the heat supply backwater is heated for the second time by the heated water with the height of Wen Shuiguan 11 after a certain temperature is reached, so that the heating efficiency of the heat supply backwater in the low-temperature water tank 14 can be improved, the temperature fluctuation of the heat supply backwater in the low-temperature water tank 14 can be reduced, and the heat supply effect is ensured.
Specifically, the heating water stored in the high-temperature water tank 11 is a heat exchange medium, and is mainly used for realizing heat transfer, and the high-temperature water tank 11 is a pressurized high Wen Shuiguan 11, so that the temperature of steam can be maintained. The heat supply backwater stored in the low-temperature water tank 14 is also a heat exchange medium and is also used for heat transfer.
In the technical scheme of the embodiment, the heat of the medium-pressure cylinder of the steam turbine 1 can be extracted through the arranged high Wen Shuiguan, and the temperature of the heat supply backwater in the low-temperature water tank 14 is adjusted through heat exchange between the high Wen Shuiguan and the low-temperature water tank 14, so that the gradient utilization of energy is realized.
Optionally, in one embodiment of the disclosure, the heat exchange tube assembly includes a first tube 18, a second tube 19, and a water pump 15, the first tube 18 and the second tube 19 are connected to the low Wen Shuiguan and the high Wen Shuiguan has a first heat exchanger thereon, the first heat exchanger has a first heat exchange inlet and a first heat exchange outlet, an end of the first tube 18 remote from the low temperature water tank 14 is in communication with the first heat exchange inlet, an end of the second tube 19 remote from the low temperature water tank 14 is in communication with the first heat exchange outlet, and the water pump 15 is connected to the first tube 18 or the second tube 19.
In this embodiment, the first pipe 18 and the second pipe 19 are used for flowing heat supply backwater, the water pump 15 is used for generating driving force for the heat supply backwater, so that the heat supply backwater in the low-temperature water tank 14 flows into the first heat exchanger, and the heat of the heating water in the high-temperature water tank 11 is transferred into the heat supply backwater flowing into the first heat exchanger by the first heat exchanger. Specifically, the first pipeline 18 is used for heating backwater in the low-temperature water tank 14 to flow to the first heat exchanger, and the second pipeline 19 is used for heating backwater after heat exchange of the first heat exchanger to flow back to the low-temperature water tank 14. Specifically, the water pump 15 is connected to the first pipe 18.
In the technical scheme of the embodiment, the first pipeline 18, the second pipeline 19 and the water pump 15 are used for conveying the heat supply backwater in the low-temperature water tank 14 to the high-temperature water tank 11, so that the heat supply backwater in the low-temperature water tank 14 can be heated conveniently. Because the temperature of the heating water in the high-temperature water tank 11 is high, the heat is sufficient, and most of the heat can be transferred to the heating backwater in the first heat exchanger.
In addition, the flow rate of the heat supply backwater in the low-temperature water tank 14 to the first heat exchanger can be controlled by the water pump 15, so that the heat transferred from the heat supply backwater in the low-temperature water tank 14 to the first heat exchanger can be controlled, and the temperature of the heating water in the high Wen Shuiguan and the temperature of the heat supply backwater in the low-temperature water tank 14 can be controlled.
Optionally, in one embodiment of the present disclosure, the third pipeline 20 and the fourth pipeline 21 are disposed on the low-temperature water tank 14, the electric heat pump 7 has a heating inlet and a heating outlet, an end of the third pipeline 20 away from the low-temperature water tank 14 is communicated with the heating outlet, an end of the fourth pipeline 21 away from the low-temperature water tank 14 is communicated with the water inlet end of the heat supply heat exchange station 13, and the water outlet end of the heat supply heat exchange station 13 is communicated with the heating inlet through the fifth pipeline 22.
In this embodiment, the heat-supply backwater heated by the high-temperature water tank 11 in the low-temperature water tank 14 flows to the heat-supply heat exchange station 13 through the fourth pipeline 21, is heated by the heat-supply heat exchange station 13, and then flows to the electric heat pump 7 through the fifth pipeline 22 after being used by the heat-supply heat exchange station 13, and flows to the low-temperature water tank 14 through the third pipeline 20 after being heated for the first time, and then is pumped into the first heat exchanger through the water pump 15, and is secondarily heated by the high Wen Shuiguan 11 to form a circulation loop, thereby facilitating the circulation.
Optionally, in one embodiment of the disclosure, the coal-fired heating unit further includes a deaerator 3, the deaerator 3 is connected to the steam turbine 1, the height Wen Shuiguan has a second heat exchanger with a second heat exchange inlet and a second heat exchange outlet, the second heat exchange inlet is in communication with the intermediate pressure cylinder of the steam turbine 1, and the second heat exchange outlet is in communication with the deaerator 3.
In this embodiment, the steam in the intermediate pressure cylinder of the steam turbine 1 enters the second heat exchanger, the heat is transferred to the heating water in the height Wen Shuiguan 11, the heating water is heated, the steam in the second heat exchanger forms condensed water and flows into the deaerator 3, the deaerator 3 returns to the steam turbine 1, and the deaerator 3 is used for removing oxygen and protecting equipment.
In the present embodiment, the second heat exchanger is provided to facilitate the transfer of heat of steam in the intermediate-pressure cylinder of the steam turbine 1 to the high-temperature water tank 11, thereby heating the heated water in the high-temperature water tank 11.
Alternatively, in one embodiment of the present disclosure, the temperature of the water in the high-temperature water tank 11 is 200 to 300 ℃; the temperature of the water in the low Wen Shuiguan 14 is 100-130 ℃.
The technical solution of this embodiment can be beneficial to heat the water in the low-temperature water tank 14 by the high Wen Shuiguan 11, and simultaneously ensure the heat supply effect generated by the heat supply and exchange station 13.
Alternatively, in one embodiment of the present disclosure, the flywheel energy storage device comprises a flywheel 10, an electric motor 9 and power electronics 8, the power electronics 8 being electrically connected to the generator 2, the electric motor 9 being connected to the power electronics 8, the electric motor 9 and the power electronics 8 being for converting electric energy into mechanical energy, the flywheel 10 being connected to the electric motor 9, the flywheel 10 being for storing or releasing mechanical energy.
In this embodiment, after the generator 2 generates electric energy, part of the electric energy is transmitted to the power electronic device 8 and the motor 9, and the electric energy is converted into mechanical energy by the power electronic device 8 and the motor 9, and is transmitted to the flywheel 10, and the mechanical energy is stored by the flywheel 10. When the electric load needs to be adjusted, the stored mechanical energy can be transmitted to the motor 9 and the power electronic equipment 8 through the flywheel 10, and the mechanical energy is reversely converted into electric energy by the motor 9 and the power electronic equipment 8, released and transmitted to the booster station 12, so that the electric load adjustment of the generator 2 is realized. It should be noted that the mechanical energy stored in the flywheel 10 and the rotational speed thereof may be regarded as a single function.
In the technical scheme of the embodiment, the electric energy is converted into mechanical energy by adopting the motor 9 and the power electronic equipment 8 for storage, so that the energy storage can be facilitated, and when the electric energy storage device is required to be used, the release of the energy can be realized, so that the electric load can be conveniently adjusted. In addition, frequent fluctuations in the electrical load can be filtered by the filtering action of the motor 9 and the power electronics 8 and the flywheel 10.
The working process of the coal-fired heat supply unit is as follows:
the steam from the boiler enters the steam turbine 1 to do work, the steam turbine 1 drives the generator 2 to start, and the exhaust steam after the steam turbine 1 does work enters the condenser 4 to be cooled and condensed.
The exhaust steam enters a condenser to exchange heat and condense and returns to the boiler, so that the recycling is realized, and the exhaust steam entering the condenser transfers heat to cooling circulating water; part of cooling circulating water in the condenser 4 enters a cooling tower 5 for cooling and then returns to the condenser 4; the other part of the cooling circulating water in the condenser 4 enters the electric heat pump 7, and under the condition that the electric heat pump 7 is driven by the electric power provided by the generator 2, the low-grade heat energy in the cooling circulating water is recovered by the electric heat pump 7, and then the cooling circulating water and the cooling circulating water from the cooling tower 5 are converged and returned to the condenser 4.
The water in the low-temperature water tank 14 for heat supply can enter the electric heat pump 7, the electric heat pump 7 transfers the heat from the cooling circulating water to the heat supply backwater under the electric drive, the heat supply backwater is heated, and the heat supply backwater enters the low-temperature water tank 14 through the third pipeline 20.
The steam of the medium-pressure cylinder of the steam turbine 1 enters a second heat exchanger on the high-temperature water tank 11 to exchange heat, heats the heating water in the high-temperature water tank 11, and transfers heat to heating backwater; the heat supply backwater in the low-temperature water tank 14 enters the first heat exchanger of the high-temperature water tank 11 under the action of the water pump 15, the heat of the heating water in the high-temperature water tank 11 is transferred to the heat supply backwater, and the heat supply backwater flows back to the low-temperature water tank 14 and is conveyed to the heat supply heat exchange station 13 to generate heat.
Normally, the heat supply backwater of the low-temperature water tank 14 also plays a role as a heat exchange medium. Under the condition of controlling the flow rate of the heat supply backwater by the water pump 15, the heating temperature adjustment of the heat supply backwater can be realized, the thermoelectric ratio of the coal-fired heat supply unit is further enlarged, meanwhile, flexible heat supply is satisfied, and the thermoelectric decoupling of the unit is realized.
Part of the electric energy generated by the generator 2 is converted into mechanical energy through the power electronic equipment 8 and the motor 9 to be stored in the flywheel 10, and the rest of the electric energy is directly transmitted to the internet through the booster station 12. The kinetic energy stored in the flywheel 10 can be released when needed, enabling the regulation of the electrical load.
In fact, in the normal operation state of the coal-fired heating unit, the flywheel energy storage device and the electric heating pump 7 are in a balanced state, and the adjustment capability of the flywheel energy storage device and the electric heating pump 7 can be started only when the thermal load and/or the electric load exceed a certain adjustment range.
When the thermoelectric load exceeds the original thermoelectric regulation range of the coal-fired heating unit, the regulation mode of the electric heat pump 7 is started. At this time, the electric heating pump 7 operates to share the heat load of the coal-fired heat supply unit, so that the thermoelectric load of the coal-fired heat supply unit returns to the original adjusting range again, thermoelectric adjustment is realized, and finally the requirement of reducing the minimum operation load of the coal-fired heat supply unit is met.
When the lifting speed of the electric load exceeds the original adjusting range of the coal-fired heat supply unit, an adjusting mode of the flywheel energy storage device is started. The flywheel energy storage device is matched with the generator 2, so that the power of the generator 2 meets the requirement of an electric load.
The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.
In addition, the specific features described in the foregoing embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, the present disclosure does not further describe various possible combinations.
Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.
Claims (9)
1. A coal-fired heating unit, comprising: the system comprises a steam turbine, a generator, a condenser, a circulating pump, an electric heat pump, a water tank assembly, a heat supply and exchange station and a flywheel energy storage device;
the steam turbine is used for being connected with a boiler, the generator is connected with the steam turbine, the condenser is connected with the exhaust steam end of the steam turbine, and exhaust steam generated by the steam turbine is used for being discharged into the condenser;
the electric heating pump is connected with the condenser, the electric heating pump is used for collecting heat of exhaust steam in the condenser, the water tank assembly is connected with the electric heating pump, the electric heating pump is used for heating water in the water tank assembly, the water tank assembly is connected with the heat supply and heat exchange station, and the heat of the water in the water tank assembly is used for being transferred to the heat supply and heat exchange station to realize heat supply;
the condenser is provided with a drain pipe and a water return pipe, the circulating pump is connected to the water return pipe, the electric heating pump is provided with a heat taking inlet and a heat taking outlet, one end of the drain pipe, which is far away from the condenser, is communicated with the heat taking inlet, and one end of the water return pipe, which is far away from the condenser, is communicated with the heat taking outlet;
the flywheel energy storage device is electrically connected with the generator and is used for storing part of electric energy generated by the generator.
2. The coal fired heating unit of claim 1, wherein the electric heat pump is electrically connected to the generator, and wherein the electric power generated by the generator is used to drive the electric heat pump.
3. The coal-fired heating unit as recited in claim 1, further comprising a cooling tower having a cooling inlet and a cooling outlet, wherein an end of the drain pipe remote from the condenser is in communication with the cooling inlet, and wherein an end of the return pipe remote from the condenser is in communication with the cooling outlet.
4. The coal-fired heating unit of claim 1, wherein the water tank assembly comprises a high-temperature water tank and a low-temperature water tank, the high-temperature water tank is connected with a medium-pressure cylinder of the steam turbine, the high-temperature water tank is used for collecting heat of steam in the medium-pressure cylinder of the steam turbine to heat stored water, the low-temperature water tank is connected with the electric heating pump, the heat collected by the electric heating pump is used for heating the water stored in the low-temperature water tank, the high-temperature water tank is connected with the low-temperature water tank through a heat exchange pipeline assembly, the heat in the high-temperature water tank is used for heating the water stored in the low-temperature water tank, and the low-temperature water tank is connected with the heat supply and heat exchange station, so that the heat supply and heat exchange station collects the heat of the water in the low-temperature water tank to realize heat supply.
5. The coal-fired heating unit of claim 4, wherein the heat exchange pipeline assembly comprises a first pipeline, a second pipeline and a water pump, the first pipeline and the second pipeline are connected to the low-temperature water tank, the high-temperature water tank is provided with a first heat exchanger, the first heat exchanger is provided with a first heat exchange inlet and a first heat exchange outlet, one end of the first pipeline away from the low-temperature water tank is communicated with the first heat exchange inlet, one end of the second pipeline away from the low-temperature water tank is communicated with the first heat exchange outlet, and the water pump is connected to the first pipeline or the second pipeline.
6. The coal-fired heat supply unit according to claim 4, wherein a third pipeline and a fourth pipeline are arranged on the low-temperature water tank, the electric heating pump is provided with a heating inlet and a heating outlet, one end of the third pipeline, which is far away from the low-temperature water tank, is communicated with the heating outlet, one end of the fourth pipeline, which is far away from the low-temperature water tank, is communicated with the water inlet end of the heat supply heat exchange station, and the water outlet end of the heat supply heat exchange station is communicated with the heating inlet through a fifth pipeline.
7. The coal-fired heating unit of claim 4, further comprising a deaerator connected to the steam turbine, the high temperature water tank having a second heat exchanger with a second heat exchange inlet in communication with the intermediate pressure cylinder of the steam turbine and a second heat exchange outlet in communication with the deaerator.
8. The coal-fired heating unit according to claim 4, wherein the temperature of water in the high-temperature water tank is 200-300 ℃; the temperature of the water in the low-temperature water tank is 100-130 ℃.
9. The coal fired heating unit according to any of claims 1-8, wherein the flywheel energy storage device comprises a flywheel, an electric motor and power electronics, the power electronics being electrically connected to the generator, the electric motor being connected to the power electronics, the electric motor and the power electronics being for converting electrical energy into mechanical energy, the flywheel being connected to the electric motor, the flywheel being for storing or releasing mechanical energy.
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| CN106765455A (en) * | 2016-11-28 | 2017-05-31 | 中能服能源科技股份有限公司 | A kind of energy-saving heat storage and heat supply system |
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| CN109579112A (en) * | 2019-01-07 | 2019-04-05 | 清华大学 | A kind of thermal power plant unit thermoelectricity decoupled system and its operation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20040020206A1 (en) * | 2001-05-07 | 2004-02-05 | Sullivan Timothy J. | Heat energy utilization system |
| US11821637B2 (en) * | 2019-03-25 | 2023-11-21 | Dalian University Of Technology | Energy-saving system using electric heat pump to deeply recover flue gas waste heat from heat power plant for district heating |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106765455A (en) * | 2016-11-28 | 2017-05-31 | 中能服能源科技股份有限公司 | A kind of energy-saving heat storage and heat supply system |
| WO2018233024A1 (en) * | 2017-06-22 | 2018-12-27 | 赫普热力发展有限公司 | Thermoelectric decoupling peak load regulating system |
| CN107940538A (en) * | 2017-12-12 | 2018-04-20 | 华能国际电力股份有限公司丹东电厂 | A kind of classification hold over system and its peak regulating method for cogeneration units |
| CN109579112A (en) * | 2019-01-07 | 2019-04-05 | 清华大学 | A kind of thermal power plant unit thermoelectricity decoupled system and its operation method |
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