CN111322660B - Integrated absorption heat pump supercritical carbon dioxide circulating cogeneration system and method - Google Patents
Integrated absorption heat pump supercritical carbon dioxide circulating cogeneration system and method Download PDFInfo
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- CN111322660B CN111322660B CN202010164745.7A CN202010164745A CN111322660B CN 111322660 B CN111322660 B CN 111322660B CN 202010164745 A CN202010164745 A CN 202010164745A CN 111322660 B CN111322660 B CN 111322660B
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 82
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 41
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 41
- 238000010521 absorption reaction Methods 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 9
- 230000001105 regulatory effect Effects 0.000 claims abstract description 46
- 238000010248 power generation Methods 0.000 claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 238000010438 heat treatment Methods 0.000 claims description 21
- 239000006096 absorbing agent Substances 0.000 claims description 15
- 230000008878 coupling Effects 0.000 abstract description 3
- 238000010168 coupling process Methods 0.000 abstract description 3
- 238000005859 coupling reaction Methods 0.000 abstract description 3
- 239000002918 waste heat Substances 0.000 abstract description 3
- 238000000605 extraction Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000012423 maintenance 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
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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
- F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
- F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
- F01K25/10—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours the vapours being cold, e.g. ammonia, carbon dioxide, ether
- F01K25/103—Carbon dioxide
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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
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
- F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
- F24D19/1015—Arrangement or mounting of control or safety devices for water heating systems for central heating using a valve or valves
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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
- F24D3/18—Hot-water central heating systems using heat pumps
-
- 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
- F24D2200/12—Heat pump
- F24D2200/126—Absorption type heat pumps
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
- Sorption Type Refrigeration Machines (AREA)
Abstract
A supercritical carbon dioxide circulating cogeneration system and method integrating an absorption heat pump comprises a supercritical carbon dioxide power generation system and a heat supply system, wherein the supercritical carbon dioxide power generation system comprises a main compressor, a recompression, a low-temperature heat regenerator, a high-temperature heat regenerator, a boiler, a turbine and a precooler, and the heat supply system comprises a low-temperature heater, a high-temperature heater and an absorption heat pump. According to the invention, the flow regulating valve is adopted to regulate the flow of carbon dioxide in the high-temperature heater, so that the heat load and the electric load proportion can be flexibly regulated, and the thermal electrolytic coupling is realized; according to the invention, the heat exchange of the absorption heat pump is adopted between the primary pipe network and the secondary pipe network, so that the return water temperature of the primary pipe network can be greatly reduced, and the heat supply capacity of the system is remarkably improved; the invention adopts the arrangement of the low-temperature heater and the high-temperature heater, realizes the energy quality-division cascade utilization, and can completely recycle the low-quality waste heat at the cold end of the system and greatly improve the heat and energy utilization efficiency because the return water temperature of the primary network is about 25 ℃.
Description
Technical Field
The invention relates to the technical field of power generation, in particular to an integrated absorption heat pump supercritical carbon dioxide circulating cogeneration system and method.
Background
The new energy such as photovoltaic, wind power and the like has high cleanliness and less environmental pollution, so that the great development of the clean energy such as photovoltaic, wind power and the like has great significance for energy conservation and emission reduction in China. In recent years, the generation proportion of new energy sources such as photovoltaic power, wind power and the like in China is greatly increased, but the intermittent power generation characteristic leads to poor power output stability, so that the phenomenon of 'wind and light abandoning' is serious. Therefore, the consumption of a large amount of new energy sources brings higher requirements for the peak shaving capacity of the power grid in China. At present, coal-fired power generation is still a main power generation mode in China, and the operation flexibility of the coal-fired unit needs to be further improved to improve the peak shaving capacity of the power grid. The conventional coal-fired generator set has more steam extraction, higher system complexity and stronger thermoelectric coupling degree, so that the difficulty of thermal decoupling of the coal-fired generator set is higher, and the flexibility of the coal-fired generator set is poorer.
The supercritical carbon dioxide power cycle system has the advantages of high heat efficiency, compact structure, small investment, low operation and maintenance cost and the like, and attracts students to develop a great deal of research on the application of supercritical carbon dioxide power cycle in the field of coal-fired power generation. Research shows that compared with a conventional coal-fired unit, the supercritical carbon dioxide coal-fired power generation system has higher power generation efficiency and lower investment; the cold end temperature of the system is higher, the system has certain heat supply capacity, no air extraction link exists, and the system structure is simpler, so the system has higher thermoelectric decoupling capacity.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide an integrated absorption heat pump supercritical carbon dioxide circulating cogeneration system and a method, wherein cold-end waste heat can be fully recovered for heat supply by coupling an absorption heat pump heat supply system at the cold end of a supercritical carbon dioxide power generation system, and thermal decoupling is realized.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the integrated absorption heat pump supercritical carbon dioxide circulating cogeneration system comprises a supercritical carbon dioxide power generation system and a heat supply system;
the supercritical carbon dioxide power generation system comprises a main compressor 1, wherein an outlet of the main compressor 1, an inlet and an outlet of a cold side of a low-temperature heat regenerator 2, an inlet and an outlet of a cold side of a high-temperature heat regenerator 3, an inlet and an outlet of a boiler 4, an inlet and an outlet of a turbine 5, an inlet and an outlet of a hot side of the high-temperature heat regenerator 3, an inlet and an outlet of a hot side of the low-temperature heat regenerator 2, an inlet and an outlet of a low-temperature heat network heater bypass valve 8, an inlet and an outlet of a precooler regulating valve 9, an inlet and an outlet of a precooler 10 and an inlet of the main compressor 1 are sequentially communicated; the inlet and outlet of the compressor 12 are respectively communicated with the hot side outlet of the low-temperature heat regenerator 2 and the cold side outlet of the low-temperature heat regenerator 2; the outlet of the low-temperature heat-net heater bypass valve 8 is communicated with the outlet of the precooler 10 through a precooler bypass valve 11;
the heating system comprises a low-temperature heat-net heater 7, a high-temperature heat-net heater 14 and an absorption heat pump, wherein the absorption heat pump comprises a condenser 15, a throttle valve 16, a first generator 17, an absorber 19 and a second generator 21 which are sequentially communicated;
the inlet and outlet of the high-temperature heat regenerator 3 hot side outlet, the inlet and outlet of the high-temperature heat network heater regulating valve 13, the inlet and outlet of the high-temperature heat network heater 14 hot side outlet, the inlet and outlet of the low-temperature heat network heater regulating valve 6, the inlet and outlet of the low-temperature heat network heater 7 hot side outlet, the inlet and outlet of the precooler regulating valve 9 and the inlet of the precooler 10 are sequentially communicated;
the inlet of the low-temperature heat-net heater regulating valve 6 is communicated with the hot side outlet of the low-temperature heat-net heater 7 through a low-temperature heat-net heater bypass valve 8; the outlet of the lower end of the first generator 17 is communicated with the inlet of the upper end of the first generator 17 through a working medium pump 18; the outlet of the lower end of the absorber 19 is communicated with the inlet of the upper end of the second generator 21 sequentially through the cold sides of the solution pump 20 and the solution heat exchanger 22; the outlet of the lower end of the second generator 21 is communicated with the inlet of the upper end of the absorber 19 through the hot side of the solution heat exchanger 22 and the solution valve 23.
The second generator 21, the first generator 17, the low-temperature heat-net heater 7 and the high-temperature heat-net heater 14 are sequentially communicated with each other along the circulating water circulation direction of the primary net to form a primary net heat exchange system; the absorber 19 and the condenser 15 are sequentially communicated along the circulating water flowing direction of the secondary network to form a secondary network heating system.
The high-temperature heat-net heater regulating valve 13 regulates the carbon dioxide flow in the primary net heat exchange system, thereby regulating the heat load.
The heat exchange is realized between the primary net circulating water and the secondary net circulating water through an absorption heat pump, and the primary net backwater is about 25 ℃.
In a heating period, a high-temperature heat-net heater regulating valve 13, a low-temperature heat-net heater regulating valve 6 and a precooler bypass valve 11 are opened, a low-temperature heat-net heater bypass valve 8 and a precooler regulating valve 1 are closed, supercritical carbon dioxide working medium is boosted by a main compressor 1, then absorbs heat in a low-temperature heat regenerator 2, a high-temperature heat regenerator 3 and a boiler 4 in sequence and then enters a turbine 5 to do work, exhaust gas of the turbine 5 is split into two streams after being released in the high-temperature heat regenerator 3, and enters a low-temperature heat regenerator 2 and a low-temperature heat-net heater 14 to be combined after being released, and then enters a low-temperature heat-net heater 7 to be cooled and enters the main compressor 1 again to form a closed power generation circulation system; the return water temperature of the primary network is about 25 ℃, and the working medium at the inlet of the main compressor 1 can be cooled to about 32 ℃, so that the carbon dioxide at the cold end of the power generation system enters the main compressor 1 through a bypass pipeline where a precooler bypass valve 11 is positioned after being cooled by a low-temperature network heater 7 and does not flow through a precooler 10; the high-temperature heat-net heater regulating valve 13 regulates the carbon dioxide flow of the high-temperature heat-net heater 14 so as to regulate the thermoelectric ratio; the primary network backwater sequentially passes through the low-temperature heat network heater 7 and the high-temperature heat network heater 14 to recover the heat of the cold-end working medium, and then enters the second generator 21 and the first generator 17 to release heat so as to drive the heat pump to operate; the secondary net backwater absorbs heat and heats up in the absorber 19 and the condenser 15 in sequence and supplies heat to a heat user;
in a non-heating period, the heating system stops running, a low-temperature heat-net heater regulating valve 13, a low-temperature heat-net heater regulating valve 6 and a precooler bypass valve 11 are closed, a low-temperature heat-net heater bypass valve 8 and a precooler regulating valve 9 are opened, all outlet working media at the hot side of a high-temperature heat regenerator 3 in the supercritical carbon dioxide power generation system enter a low-temperature heat regenerator 2 to release heat, and flow through a pipeline where the low-temperature heater bypass valve 8 and the precooler regulating valve 9 are located, and enter a main compressor 1 after being cooled by a precooler 10; other operation processes of the supercritical carbon dioxide power generation system are the same as those of the heating period.
The invention has the beneficial effects that:
1. the invention can realize complete decoupling of thermoelectric and greatly improves the operation flexibility of the system.
2. The absorption heat pump is adopted between the primary network and the secondary network, so that the return water temperature of the primary network can be reduced to about 25 ℃, and the heat supply capacity of the system is greatly improved.
3. The invention can completely recycle the cold end waste heat of the system in the heating period, realizes the energy quality-dividing cascade utilization and greatly improves the energy utilization efficiency.
Drawings
Fig. 1 is a schematic diagram of an integrated absorption heat pump supercritical carbon dioxide cycle cogeneration system of the invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings.
As shown in fig. 1, the integrated absorption heat pump supercritical carbon dioxide circulation cogeneration system is characterized in that: comprises a supercritical carbon dioxide power generation system and a heating system;
the outlet of the main compressor 1, the inlet and outlet of the cold side of the low-temperature heat regenerator 2, the inlet and outlet of the cold side of the high-temperature heat regenerator 3, the inlet and outlet of the boiler 4, the inlet and outlet of the turbine 5, the inlet and outlet of the hot side of the high-temperature heat regenerator 3, the inlet and outlet of the hot side of the low-temperature heat regenerator 2, the inlet and outlet of the bypass valve 8 of the low-temperature heat-net heater, the inlet and outlet of the precooler regulating valve 9, the inlet and outlet of the precooler 10 and the inlet of the main compressor 1 are sequentially communicated; the inlet and outlet of the compressor 12 are respectively communicated with the hot side outlet of the low-temperature heat regenerator 2 and the cold side outlet of the low-temperature heat regenerator 2; the outlet of the low-temperature heat-net heater bypass valve 8 is communicated with the outlet of the precooler 10 through a precooler bypass valve 11;
the heating system comprises a low-temperature heat-net heater 7, a high-temperature heat-net heater 14 and an absorption heat pump which is formed by sequentially connecting a condenser 15, a throttle valve 16, a first generator 17, an absorber 19 and a second generator 21; the hot side outlet of the high-temperature heat regenerator 3, the inlet and outlet of the regulating valve 13 of the high-temperature heat net heater, the hot side inlet and outlet of the high-temperature heat net heater 14, the inlet and outlet of the regulating valve 6 of the low-temperature heat net heater, the hot side inlet and outlet of the low-temperature heat net heater 7, the inlet and outlet of the regulating valve 9 of the precooler and the inlet of the precooler 10 are sequentially communicated; the inlet of the low-temperature heat-net heater regulating valve 6 is communicated with the hot side outlet of the low-temperature heat-net heater 7 through a low-temperature heat-net heater bypass valve 8; the outlet of the lower end of the first generator 17 is communicated with the inlet of the upper end of the first generator 17 through a working medium pump 18; the outlet of the lower end of the absorber 19 is communicated with the inlet of the upper end of the second generator 21 sequentially through the cold sides of the solution pump 20 and the solution heat exchanger 22; the outlet of the lower end of the second generator 21 is communicated with the inlet of the upper end of the absorber 19 sequentially through the hot side of the solution heat exchanger 22 and the solution valve 23; the generator II 21, the generator I17, the low-temperature heat-net heater 7 and the high-temperature heat-net heater 14 are sequentially communicated along the circulating water circulation direction of the primary net to form a primary net heat exchange system; the absorber 19 and the condenser 15 are sequentially communicated along the circulating water flowing direction of the secondary network to form a secondary network heating system.
As a preferred embodiment of the present invention, the first auxiliary precooler and the second auxiliary precooler are arranged in parallel at a position before the precooler 10.
In a preferred embodiment of the present invention, the carbon dioxide temperature in the high-temperature heating grid heater 14 is high, so that the primary grid circulating water can be heated to about 130 ℃.
As a preferred embodiment of the present invention, the high-temperature heat-net heater regulating valve 13 regulates the heat load by regulating the flow of carbon dioxide in the primary net heat exchange system.
In a preferred embodiment of the present invention, heat exchange is realized between the primary-net circulating water and the secondary-net circulating water by an absorption heat pump, and the primary-net backwater is at about 25 ℃.
As shown in fig. 1, in the heating period, a high-temperature heat-net heater regulating valve 13, a low-temperature heat-net heater regulating valve 6 and a precooler bypass valve 11 are opened, a low-temperature heat-net heater bypass valve 8 and a precooler regulating valve 1 are closed, supercritical carbon dioxide working medium is boosted by a main compressor 1, then absorbs heat in a low-temperature heat regenerator 2, a high-temperature heat regenerator 3 and a boiler 4 in sequence and then enters a turbine 5 to apply work, exhaust gas of the turbine 5 is split into two streams after being released in the high-temperature heat regenerator 3, and then enters a low-temperature heat regenerator 2 and a high-temperature heat-net heater 14 to be combined after being released, and then enters a low-temperature heat-net heater 7 to be cooled and enters the main compressor 1 again to form a closed power generation circulation system; the return water temperature of the primary network is about 25 ℃, and the working medium at the inlet of the main compressor 1 can be cooled to about 32 ℃, so that the carbon dioxide at the cold end of the power generation system enters the main compressor 1 through a bypass pipeline where a precooler bypass valve 11 is positioned after being cooled by a low-temperature network heater 7 and does not flow through a precooler 10; the high-temperature heat-net heater regulating valve 13 regulates the carbon dioxide flow of the high-temperature heat-net heater 14 so as to regulate the thermoelectric ratio; the primary network backwater sequentially passes through the low-temperature heat network heater 7 and the high-temperature heat network heater 14 to recover the heat of the cold-end working medium, and then enters the second generator 21 and the first generator 17 to release heat so as to drive the heat pump to operate; the secondary net backwater absorbs heat and heats up in the absorber 19 and the condenser 15 in sequence and supplies heat to a heat user;
in a non-heating period, the heating system stops running, a low-temperature heat-net heater regulating valve 13, a low-temperature heat-net heater regulating valve 6 and a precooler bypass valve 11 are closed, a low-temperature heat-net heater bypass valve 8 and a precooler regulating valve 9 are opened, all outlet working media at the hot side of a high-temperature heat regenerator 3 in the supercritical carbon dioxide power generation system enter a low-temperature heat regenerator 2 to release heat, and flow through a pipeline where the low-temperature heater bypass valve 8 and the precooler regulating valve 9 are located, and enter a main compressor 1 after being cooled by a precooler 10; other operation processes of the supercritical carbon dioxide power generation system are the same as those of the heating period.
Claims (2)
1. The integrated absorption heat pump supercritical carbon dioxide circulating cogeneration system is characterized by comprising a supercritical carbon dioxide power generation system and a heat supply system;
the supercritical carbon dioxide power generation system comprises a main compressor (1), wherein an outlet of the main compressor (1), an inlet and an outlet of a cold side of a low-temperature heat regenerator (2), an inlet and an outlet of a cold side of a high-temperature heat regenerator (3), an inlet and an outlet of a boiler (4), an inlet and an outlet of a turbine (5), an inlet and an outlet of a hot side of the high-temperature heat regenerator (3), an inlet and an outlet of a hot side of the low-temperature heat regenerator (2), an inlet and an outlet of a bypass valve (8) of a low-temperature heat-net heater, an inlet and an outlet of a precooler regulating valve (9), an inlet and an outlet of a precooler (10) are sequentially communicated with an inlet of the main compressor (1); the inlet and the outlet of the compressor (12) are respectively communicated with the hot side outlet of the low-temperature heat regenerator (2) and the cold side outlet of the low-temperature heat regenerator (2); the outlet of the low-temperature heat-net heater bypass valve (8) is communicated with the outlet of the precooler (10) through a precooler bypass valve (11);
the heating system comprises a low-temperature heat-net heater (7), a high-temperature heat-net heater (14) and an absorption heat pump, wherein the absorption heat pump comprises a condenser (15), a throttle valve (16), a first generator (17), an absorber (19) and a second generator (21) which are sequentially communicated;
the hot side outlet of the high-temperature heat regenerator (3), the inlet and the outlet of the regulating valve (13) of the high-temperature heat net heater, the inlet and the outlet of the hot side of the high-temperature heat net heater (14), the inlet and the outlet of the regulating valve (6) of the low-temperature heat net heater, the hot side inlet and the outlet of the low-temperature heat net heater (7), the inlet and the outlet of the regulating valve (9) of the precooler and the inlet of the precooler (10) are sequentially communicated;
the inlet of the low-temperature heat-net heater regulating valve (6) is communicated with the hot side outlet of the low-temperature heat-net heater (7) through a low-temperature heat-net heater bypass valve (8); the outlet at the lower end of the generator I (17) is communicated with the inlet at the upper end of the generator I (17) through a working medium pump (18); the outlet at the lower end of the absorber (19) is communicated with the inlet at the upper end of the generator II (21) through the cold side of the solution pump (20) and the solution heat exchanger (22) in sequence; the outlet at the lower end of the second generator (21) is communicated with the inlet at the upper end of the absorber (19) through the hot side of the solution heat exchanger (22) and the solution valve (23) in sequence;
the generator II (21), the generator I (17), the low-temperature heat network heater (7) and the high-temperature heat network heater (14) are sequentially communicated along the circulating water flowing direction of the primary network to form a primary network heat exchange system; the absorber (19) and the condenser (15) are sequentially communicated along the circulating water flowing direction of the secondary network to form a secondary network heating system;
the primary network circulating water and the secondary network circulating water realize heat exchange through an absorption heat pump, and the primary network backwater is about 25 ℃;
the high-temperature heat-net heater regulating valve (13) regulates the carbon dioxide flow in the primary net heat exchange system so as to regulate the heat load.
2. The operation method of the integrated absorption heat pump supercritical carbon dioxide cycle cogeneration system according to claim 1, wherein in a heating period, a high-temperature heat net heater regulating valve (13), a low-temperature heat net heater regulating valve (6) and a precooler bypass valve (11) are opened, a low-temperature heat net heater bypass valve (8) and a precooler regulating valve (9) are closed, supercritical carbon dioxide working medium is boosted by a main compressor (1), then absorbs heat in a low-temperature heat regenerator (2), a high-temperature heat regenerator (3) and a boiler (4) in sequence and then enters a turbine (5) to do work, exhaust gas of the turbine (5) is split into two after being released in the high-temperature heat regenerator (3), and then enters a low-temperature heat net heater (7) to be cooled after being respectively released, and then enters the main compressor (1) again to form a closed power generation circulation system; the return water temperature of the primary network is about 25 ℃, and the inlet working medium of the main compressor (1) can be cooled to about 32 ℃, so that the carbon dioxide at the cold end of the power generation system enters the main compressor (1) through a bypass pipeline where a precooler bypass valve (11) is positioned after being cooled by a low-temperature heat network heater (7) and does not flow through a precooler (10); the high-temperature heat-net heater regulating valve (13) regulates the carbon dioxide flow of the high-temperature heat-net heater (14) so as to regulate the thermoelectric ratio; the primary network backwater sequentially passes through a low-temperature heat network heater (7) and a high-temperature heat network heater (14) to recover cold-end working medium heat and heat up, and then enters a generator II (21) and a generator I (17) to release heat so as to drive a heat pump to operate; the secondary net backwater absorbs heat and heats up in the absorber (19) and the condenser (15) in sequence and supplies heat to a heat user;
in a non-heating period, the heating system stops running, a low-temperature heat-net heater regulating valve (13), a low-temperature heat-net heater regulating valve (6) and a precooler bypass valve (11) are closed, a low-temperature heat-net heater bypass valve (8) and a precooler regulating valve (9) are opened, all working media at the hot side of a high-temperature heat regenerator (3) in the supercritical carbon dioxide power generation system enter the low-temperature heat regenerator (2) to release heat, and flow through pipelines where the low-temperature heat-net heater bypass valve (8) and the precooler regulating valve (9) are located, and enter a main compressor (1) after being cooled by a precooler (10); other operation processes of the supercritical carbon dioxide power generation system are the same as those of the heating period.
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| CN114718680B (en) * | 2022-04-06 | 2024-01-19 | 西安热工研究院有限公司 | Supercritical CO integrated with multistage compression heat pump 2 Cogeneration system and method |
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| CN110056851A (en) * | 2019-04-25 | 2019-07-26 | 上海锅炉厂有限公司 | A kind of supercritical carbon dioxide boiler working substance humidity control system and method |
| CN211781359U (en) * | 2020-03-11 | 2020-10-27 | 西安热工研究院有限公司 | Supercritical carbon dioxide circulation combined heat and power generation system integrated with absorption heat pump |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110056851A (en) * | 2019-04-25 | 2019-07-26 | 上海锅炉厂有限公司 | A kind of supercritical carbon dioxide boiler working substance humidity control system and method |
| CN211781359U (en) * | 2020-03-11 | 2020-10-27 | 西安热工研究院有限公司 | Supercritical carbon dioxide circulation combined heat and power generation system integrated with absorption heat pump |
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