CN211781359U - Supercritical carbon dioxide circulation combined heat and power generation system integrated with absorption heat pump - Google Patents
Supercritical carbon dioxide circulation combined heat and power generation system integrated with absorption heat pump Download PDFInfo
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- CN211781359U CN211781359U CN202020298452.3U CN202020298452U CN211781359U CN 211781359 U CN211781359 U CN 211781359U CN 202020298452 U CN202020298452 U CN 202020298452U CN 211781359 U CN211781359 U CN 211781359U
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Abstract
A supercritical carbon dioxide circulation combined heat and power generation system integrated with 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 recompressor, 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 the absorption heat pump. The utility model adopts the flow regulating valve to regulate the flow of carbon dioxide in the high temperature heater, thereby flexibly regulating the proportion of heat load and electric load and realizing thermoelectric decoupling; the utility model adopts the absorption heat pump heat exchange between the primary pipe network and the secondary pipe network, which can greatly reduce the temperature of the return water of the primary pipe network and obviously improve the heat supply capacity of the system; the utility model discloses a low temperature heating ware and high temperature heating ware arrange, have realized that the energy divides the matter step to utilize, moreover because once net return water temperature is low to about 25 ℃, can the low-quality waste heat of recovery system cold junction completely, hot high energy utilization efficiency by a wide margin.
Description
Technical Field
The utility model relates to a power generation technical field, in particular to supercritical carbon dioxide circulation combined heat and power generation system of integrated absorption heat pump.
Background
The cleanliness of new energy resources such as photovoltaic energy, wind power and the like is high, and the environmental pollution is small, so that the rapid development of the clean energy resources such as photovoltaic energy, wind power and the like has great significance for energy conservation and emission reduction in China. In recent years, the power generation proportion of new energy resources such as photovoltaic energy, wind power and the like in China is greatly increased, but the intermittent power generation characteristic of the new energy resources causes poor power output stability, and the phenomenon of wind and light abandonment is serious. Therefore, the consumption of a large amount of new energy puts higher requirements on the peak regulation capacity of the power grid in China. At present, coal-fired power generation is still the main power generation mode in China, and the operation flexibility of a coal-fired unit needs to be further improved to improve the peak load regulation capacity of a power grid. And the conventional coal-fired power generating unit has more steam extraction, higher system complexity and stronger thermoelectric coupling degree, thus leading to higher difficulty of thermoelectric decoupling of the coal-fired power generating unit and poorer flexibility of the power generating unit.
By virtue of the advantages of high thermal efficiency, compact structure, low investment, low operation and maintenance cost and the like, the supercritical carbon dioxide power cycle system attracts students to develop a great deal of research on the application of the supercritical carbon dioxide power cycle in the field of coal-fired power generation. Research shows that the supercritical carbon dioxide coal-fired power generation system has higher power generation efficiency and lower investment compared with a conventional coal-fired unit; the system has the advantages of high cold end temperature, certain heat supply capacity, no air extraction link and simple structure, and has high thermoelectric decoupling capacity.
Disclosure of Invention
In order to overcome the defects of the prior art, the utility model aims to provide a supercritical carbon dioxide circulation combined heat and power generation system of integrated absorption heat pump, through at supercritical carbon dioxide power generation system cold junction coupling absorption heat pump heating system, can all retrieve the cold junction waste heat and be used for the heat supply to realize the thermoelectric decoupling zero.
In order to realize the purpose, the utility model discloses a technical scheme is:
a supercritical carbon dioxide circulation cogeneration system of an integrated absorption heat pump 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, a cold side inlet and outlet of a low-temperature heat regenerator 2, a cold side inlet and outlet of a high-temperature heat regenerator 3, an inlet and outlet of a boiler 4, an inlet and outlet of a turbine 5, a hot side inlet and outlet of the high-temperature heat regenerator 3, a hot side inlet and outlet of the low-temperature heat regenerator 2, an inlet and outlet of a low-temperature heat network heater bypass valve 8, an inlet and outlet of a precooler regulating valve 9, an inlet and outlet of; the inlet and outlet of the recompressor 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 heating network heater bypass valve 8 is communicated with the outlet of the precooler 10 through a precooler bypass valve 11;
the heat supply system comprises a low-temperature heat supply network heater 7, a high-temperature heat supply network heater 14 and an absorption heat pump, wherein the absorption heat pump is composed of a condenser 15, a throttle valve 16, an evaporator 17, an absorber 19 and a generator 21 which are sequentially communicated;
the hot side outlet of the high-temperature heat regenerator 3, the inlet and outlet of the high-temperature heat supply network heater regulating valve 13, the inlet and outlet of the hot side of the high-temperature heat supply network heater 14, the inlet and outlet of the low-temperature heat supply network heater regulating valve 6, the inlet and outlet of the hot side of the low-temperature heat supply network heater 7, the inlet and outlet of the precooler regulating valve 9 and the inlet of the precooler 10 are;
the inlet of the low-temperature heating network heater regulating valve 6 is communicated with the hot side outlet of the low-temperature heating network heater 7 through a low-temperature heating network heater bypass valve 8; the lower outlet of the evaporator 17 is communicated with the upper inlet of the generator 17 through a working medium pump 18; an outlet at the lower end of the absorber 19 is communicated with an inlet at the upper end of the generator 21 through a solution pump 20 and the cold side of a solution heat exchanger 22 in sequence; the outlet at the lower end of the 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 turn.
The generator 21, the evaporator 17, the low-temperature heating network heater 7 and the high-temperature heating network heater 14 are communicated in sequence along the circulation direction of primary network circulating water to form a primary network heat exchange system; the absorber 19 and the condenser 15 are communicated in sequence along the circulation direction of the secondary network circulating water to form a secondary network heating system.
The high-temperature heating network heater regulating valve 13 regulates the heat load by regulating the flow of carbon dioxide in the primary network heat exchange system.
The heat exchange between the primary network circulating water and the secondary network circulating water is realized through an absorption heat pump, and the primary network backwater is about 25 ℃.
A method for a supercritical carbon dioxide cycle cogeneration system of an integrated absorption heat pump, in a heating period, a high-temperature heat supply network heater regulating valve 13, a low-temperature heat supply network heater regulating valve 6 and a precooler bypass valve 11 are opened, a low-temperature heat supply network heater bypass valve 8 and a precooler regulating valve 1 are closed, a supercritical carbon dioxide working medium is boosted by a main compressor 1, then the supercritical carbon dioxide working medium 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 divided into two strands after releasing heat in the high-temperature heat regenerator 3, the two strands respectively enter the low-temperature heat regenerator 2 and the high-temperature heat supply network heater 14 to release heat and then join, then enter the low-temperature heat supply network heater 7; the return water temperature of the primary network is about 25 ℃, 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 is cooled by the low-temperature heating network heater 7 and then enters the main compressor 1 through a bypass pipeline where the bypass valve 11 of the precooler is located without flowing through the precooler 10; the high-temperature heating network heater regulating valve 13 regulates the flow of carbon dioxide of the high-temperature heating network heater 14 so as to regulate the thermoelectric ratio; the primary network backwater is heated after recycling cold end working medium heat through the low-temperature heat supply network heater 7 and the high-temperature heat supply network heater 14 in sequence, and then enters the generator 21 and the evaporator 17 to release heat so as to drive the heat pump to operate; the secondary net backwater heats up in the absorber 19 and the condenser 15 in sequence, and then supplies heat to a heat user;
in a non-heating period, the heating system stops running, the high-temperature heat supply network heater regulating valve 13, the low-temperature heat supply network heater regulating valve 6 and the precooler bypass valve 11 are closed, the low-temperature heat supply network heater bypass valve 8 and the precooler regulating valve 9 are opened, all working media at the outlet of the hot side of the high-temperature heat regenerator 3 in the supercritical carbon dioxide power generation system enter the low-temperature heat regenerator 2 to release heat, flow through a pipeline where the low-temperature heater bypass valve 8 and the precooler regulating valve 9 are located, and enter the main compressor 1 after being cooled by the precooler 1; the other operation processes of the supercritical carbon dioxide power generation system are the same as the heating period.
The utility model has the advantages that:
1. the utility model discloses can realize the complete decoupling zero of thermoelectricity, improve system operation flexibility by a wide margin.
2. The utility model discloses adopt the absorption heat pump between primary network and the secondary network can reduce primary network return water temperature to about 25 ℃, improved system's heating capacity by a wide margin.
3. The utility model discloses can the complete recovery system cold junction waste heat in the heating period, realize the energy and divide the matter step utilization, improve energy utilization efficiency by a wide margin.
Drawings
Fig. 1 is a schematic view of a supercritical carbon dioxide cyclic combined heat and power generation system of an integrated absorption heat pump of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, a supercritical carbon dioxide cycle cogeneration system of an integrated absorption heat pump is characterized in that: comprises a supercritical carbon dioxide power generation system and a heat supply system;
wherein, the outlet of a main compressor 1, the inlet and outlet of a cold side of a low-temperature heat regenerator 2, the inlet and outlet of a cold side of a high-temperature heat regenerator 3, the inlet and outlet of a boiler 4, the inlet and outlet of a turbine 5, the inlet and outlet of a hot side of the high-temperature heat regenerator 3, the inlet and outlet of a hot side of the low-temperature heat regenerator 2, the inlet and outlet of a low-temperature heat network heater bypass valve 8, the inlet and outlet of a precooler regulating valve 9, the inlet and outlet; the inlet and outlet of the recompressor 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 heating network heater bypass valve 8 is communicated with the outlet of the precooler 10 through a precooler bypass valve 11;
the heat supply system comprises a low-temperature heat supply network heater 7, a high-temperature heat supply network heater 14 and an absorption heat pump formed by sequentially communicating a condenser 15, a throttle valve 16, an evaporator 17, an absorber 19 and a generator 21; the outlet of the hot side of the high-temperature heat regenerator 3, the inlet and outlet of the high-temperature heat supply network heater regulating valve 13, the inlet and outlet of the hot side of the high-temperature heat supply network heater 14, the inlet and outlet of the low-temperature heat supply network heater regulating valve 6, the inlet and outlet of the hot side of the low-temperature heat supply network heater 7, the inlet and outlet of the precooler regulating valve 9 and the inlet of the; the inlet of the low-temperature heating network heater regulating valve 6 is communicated with the hot side outlet of the low-temperature heating network heater 7 through a low-temperature heating network heater bypass valve 8; the lower outlet of the evaporator 17 is communicated with the upper inlet of the generator 17 through a working medium pump 18; an outlet at the lower end of the absorber 19 is communicated with an inlet at the upper end of the generator 21 through a solution pump 20 and the cold side of a solution heat exchanger 22 in sequence; the outlet at the lower end of the 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 21, the evaporator 17, the low-temperature heating network heater 7 and the high-temperature heating network heater 14 are communicated in sequence along the circulation direction of primary network circulating water to form a primary network heat exchange system; the absorber 19 and the condenser 15 are communicated in sequence along the circulation direction of the secondary network circulating water to form a secondary network heating system.
As a preferred embodiment of the present invention, said first auxiliary precooler 12 and second auxiliary precooler 18 are arranged side by side in a position before precooler 13.
As a preferred embodiment of the present invention, the temperature of the carbon dioxide in the high temperature heating network heater 14 is relatively high, so that the primary network circulating water can be heated to about 130 ℃.
As a preferred embodiment of the present invention, the high temperature heating network heater regulating valve 13 regulates the heat load by regulating the flow of carbon dioxide in the primary network heat exchange system.
As the preferred embodiment of the utility model, realize the heat exchange through the absorption heat pump between the circulating water of primary network and the circulating water of secondary network, the return water of primary network is about 25 ℃.
As shown in fig. 1, in a heating period, a high-temperature heat supply network heater regulating valve 13, a low-temperature heat supply network heater regulating valve 6 and a precooler bypass valve 11 are opened, a low-temperature heat supply network heater bypass valve 8 and a precooler regulating valve 1 are closed, a supercritical carbon dioxide working medium is boosted by a main compressor 1, then the supercritical carbon dioxide working medium is absorbed 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 divided into two parts after releasing heat in the high-temperature heat regenerator 3, enters the low-temperature heat regenerator 2 and the high-temperature heat supply network heater 14 respectively to release heat and then join, then enters the low-temperature heat supply network heater 7 to be cooled, and enters the main compressor 1 again to form a closed power generation circulation; the return water temperature of the primary network is about 25 ℃, 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 is cooled by the low-temperature heating network heater 7 and then enters the main compressor 1 through a bypass pipeline where the bypass valve 11 of the precooler is located without flowing through the precooler 10; the high-temperature heating network heater regulating valve 13 regulates the flow of carbon dioxide of the high-temperature heating network heater 14 so as to regulate the thermoelectric ratio; the primary network backwater is heated after recycling cold end working medium heat through the low-temperature heat supply network heater 7 and the high-temperature heat supply network heater 14 in sequence, and then enters the generator 21 and the evaporator 17 to release heat so as to drive the heat pump to operate; the secondary net backwater heats up in the absorber 19 and the condenser 15 in sequence, and then supplies heat to a heat user;
in a non-heating period, the heating system stops running, the high-temperature heat supply network heater regulating valve 13, the low-temperature heat supply network heater regulating valve 6 and the precooler bypass valve 11 are closed, the low-temperature heat supply network heater bypass valve 8 and the precooler regulating valve 9 are opened, all working media at the outlet of the hot side of the high-temperature heat regenerator 3 in the supercritical carbon dioxide power generation system enter the low-temperature heat regenerator 2 to release heat, flow through a pipeline where the low-temperature heater bypass valve 8 and the precooler regulating valve 9 are located, and enter the main compressor 1 after being cooled by the precooler 1; the other operation processes of the supercritical carbon dioxide power generation system are the same as the heating period.
Claims (4)
1. A supercritical carbon dioxide circulation cogeneration system of an integrated absorption heat pump 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), a cold side inlet and outlet of a low-temperature heat regenerator (2), a cold side inlet and outlet of a high-temperature heat regenerator (3), an inlet and outlet of a boiler (4), an inlet and outlet of a turbine (5), a hot side inlet and outlet of the high-temperature heat regenerator (3), a hot side inlet and outlet of the low-temperature heat regenerator (2), an inlet and outlet of a low-temperature heat network heater bypass valve (8), an inlet and outlet of a precooler regulating valve (9), an inlet and outlet of a precooler (10) and an inlet of the main compressor; an inlet and an outlet of the recompressor (12) are respectively communicated with a hot side outlet of the low-temperature regenerator (2) and a cold side outlet of the low-temperature regenerator (2); the outlet of the low-temperature heating network heater bypass valve (8) is communicated with the outlet of the precooler (10) through a precooler bypass valve (11);
the heat supply system comprises a low-temperature heat supply network heater (7), a high-temperature heat supply network heater (14) and an absorption heat pump, wherein the absorption heat pump is composed of a condenser (15), a throttle valve (16), an evaporator (17), an absorber (19) and a generator (21) which are sequentially communicated;
the hot side outlet of the high-temperature heat regenerator (3), the inlet and outlet of the high-temperature heat supply network heater regulating valve (13), the inlet and outlet of the hot side of the high-temperature heat supply network heater (14), the inlet and outlet of the low-temperature heat supply network heater regulating valve (6), the inlet and outlet of the hot side of the low-temperature heat supply network heater (7), the inlet and outlet of the precooler regulating valve (9) and the inlet of the precooler (10) are communicated in sequence;
the inlet of the regulating valve (6) of the low-temperature heat supply network heater is communicated with the outlet of the hot side of the low-temperature heat supply network heater (7) through a bypass valve (8) of the low-temperature heat supply network heater; the lower end outlet of the evaporator (17) is communicated with the upper end inlet of the evaporator (17) through a working medium pump (18); an outlet at the lower end of the absorber (19) is communicated with an inlet at the upper end of the generator (21) sequentially through a solution pump (20) and the cold side of a solution heat exchanger (22); the outlet at the lower end of the 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.
2. The supercritical carbon dioxide cycle cogeneration system of an integrated absorption heat pump according to claim 1, wherein the generator (21), the evaporator (17), the low temperature heat supply network heater (7) and the high temperature heat supply network heater (14) are sequentially communicated along a circulation water flow direction of a primary network to form a primary network heat exchange system; the absorber (19) and the condenser (15) are communicated in sequence along the circulation direction of the circulating water of the secondary network to form a heating system of the secondary network.
3. The supercritical carbon dioxide cycle cogeneration system of an integrated absorption heat pump of claim 2, wherein the heat exchange between the primary network circulating water and the secondary network circulating water is realized by the absorption heat pump, and the primary network backwater is about 25 ℃.
4. The supercritical carbon dioxide cycle cogeneration system of an integrated absorption heat pump according to claim 1, wherein the high temperature heat network heater regulating valve (13) regulates the heat load by regulating the flow of carbon dioxide in the primary network heat exchange system.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111322660A (en) * | 2020-03-11 | 2020-06-23 | 西安热工研究院有限公司 | Supercritical carbon dioxide circulating cogeneration system and method of integrated absorption heat pump |
| CN115750016A (en) * | 2022-11-17 | 2023-03-07 | 中国核动力研究设计院 | Shutdown system and method of supercritical carbon dioxide recompression circulating system |
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2020
- 2020-03-11 CN CN202020298452.3U patent/CN211781359U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111322660A (en) * | 2020-03-11 | 2020-06-23 | 西安热工研究院有限公司 | Supercritical carbon dioxide circulating cogeneration system and method of integrated absorption heat pump |
| CN111322660B (en) * | 2020-03-11 | 2023-12-15 | 西安热工研究院有限公司 | Integrated absorption heat pump supercritical carbon dioxide circulating cogeneration system and method |
| CN115750016A (en) * | 2022-11-17 | 2023-03-07 | 中国核动力研究设计院 | Shutdown system and method of supercritical carbon dioxide recompression circulating system |
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