Integrated combined heat and power system with reverse brayton cycle and method of operation thereof

Abstract

This invention belongs to the field of coal-fired power technology and relates to an integrated reverse Brayton cycle cogeneration system and its operation method. It mainly includes a high-temperature thermal storage tank, a low-temperature thermal storage tank, a compressor, an expander, a molten salt heater, a regenerator, a cold source heater, a coal-fired boiler, a high-pressure cylinder, an intermediate-pressure cylinder, a low-pressure cylinder, a steam turbine, a condenser, and a generator. This invention couples two thermal storage tanks to a conventional cogeneration unit, utilizing the reverse Brayton cycle and the main boiler steam to absorb excess electricity. The molten salt in the low-temperature thermal storage tank is heated to a high temperature and stored. The high-temperature molten salt can heat the main steam, improving the unit's peak load capacity. This invention helps improve the load regulation capability of cogeneration units.

Description

Technical Field

[0001] This invention relates to the field of coal-fired power generation technology, specifically to an integrated reverse Brayton cycle cogeneration system and its operation method. Background Technology

[0002] Under the overarching trends of sustainable development and the "dual carbon" goal, the energy industry is undergoing a profound transformation. Traditional thermal power, long the core pillar of electricity supply, is seeing its development space gradually shrink, with the industry's focus shifting to green and clean new energy power generation forms such as wind and solar power. The large-scale popularization of renewable energy is making the energy supply structure increasingly diversified and complete. However, the output of these renewable energy sources exhibits significant randomness and instability, posing new challenges to the stable operation of the power system. Maintaining a balance between electricity supply and demand requires the power grid to have stronger flexible dispatch and regulation capabilities. Under this industry situation, traditional thermal power generating units need to undergo technological optimization and operational mode innovation, relying on flexible adjustments to power generation load to adapt to new power operation scenarios.

[0003] Combining energy storage technology with thermal power units can significantly enhance the peak-shaving capacity of the units and effectively mitigate various hidden dangers caused by fluctuations in renewable energy generation. This operating mode can not only stabilize the operation of the entire power system and reduce costs, but also effectively alleviate the waste of wind and solar power generation, and truly help the region steadily move towards low-carbon and energy-saving development. With the continuous increase in renewable energy installed capacity and power generation, the market urgently needs highly flexible, cost-effective, and efficient power storage facilities. Under the goal of promoting the steady development of the regional new energy industry, coal-fired power units can reduce their power generation load during periods of sufficient wind and solar power generation, maximizing the utilization of renewable energy power and helping to steadily reduce regional carbon emissions. At the same time, the peak capacity of existing units is insufficient to meet peak electricity demand, and multiple measures are needed to improve the peak power output of units to ensure a stable power supply during peak periods. Summary of the Invention

[0004] To achieve the above objectives, the present invention adopts the following technical solution: An integrated reverse Brayton cycle cogeneration system includes a steam turbine system and a reverse Brayton cycle system. The steam outlet of the superheater of the coal-fired boiler (14) of the steam turbine system is connected to one end of a first synchronization valve (16). The other two ends of the first synchronization valve (16) are respectively connected to the inlet of a high-pressure cylinder (18) and the cold end outlet of the superheater (8). The outlet of the high-pressure cylinder (18) is connected to one end of a second synchronization valve (17). The other two ends of the second synchronization valve (17) are respectively connected to the reheater inlet of the coal-fired boiler (14) and the reheater (1... 5) The cold end outlet of the reheater (15) is connected to one end of the fifth synchronization valve (19), and the other two ends of the fifth synchronization valve (19) are connected to the reheater outlet of the coal-fired boiler (14) and the inlet of the intermediate pressure cylinder (20), respectively. The outlet of the intermediate pressure cylinder (20) is connected to the inlet of the diversion valve (21), and the outlet of the diversion valve (21) is connected to the inlet of the low pressure cylinder (22) and the inlet of the heat network heater (12), respectively. The outlet of the low pressure cylinder (22) is connected to the inlet of the condenser (24), and the outlet of the condenser (24) is connected to the condenser. The inlet of the water pump (25) is connected to the outlet of the condensate pump (25), the outlet of the heating network heater (12), and the extraction steam outlet of the intermediate pressure cylinder (20), respectively. The heating network return water is connected to the inlet of the heating network heater (12), the heating network supply water is connected to the outlet of the heating network heater (12), the outlet of the deaerator (27) is connected to the inlet of the feed water pump (28), the outlet of the feed water pump (28) is connected to the cold end inlet of the high pressure heater (30), and the extraction steam inlet of the high pressure heater (30) is connected to the extraction steam outlet of the high pressure cylinder (18). The steam outlet is connected, and the two ends of the third synchronous valve (26) are respectively connected to the cold end outlet of the high pressure heater (30) and one end of the fourth synchronous valve (29). The other end of the third synchronous valve (26) is connected to the hot end inlet of the cold source heater (5). The hot end outlet of the cold source heater (5) is connected to the inlet of the deaerator (27). The two ends of the fourth synchronous valve (29) are respectively connected to one end of the third synchronous valve (26) and the cold end inlet of the preheater (10). The other end of the fourth synchronous valve (29) is connected to the preheater inlet of the coal-fired boiler (14). The outlet of the compressor (1) of the reverse Brayton cycle system is connected to the hot end inlet of the molten salt heater (2), the hot end outlet of the molten salt heater (2) is connected to the hot end inlet of the regenerator (3), the hot end outlet of the regenerator (3) is connected to the inlet of the expander (4), the outlet of the expander (4) is connected to the cold end inlet of the cold source heater (5), the cold end outlet of the cold source heater (5) is connected to the cold end inlet of the regenerator (3), the cold end outlet of the regenerator (3) is connected to the inlet of the compressor (1), the outlet of the low-temperature heat storage tank (7) is connected to the inlet of the pump (11), the outlet of the pump (11) is connected to the cold end inlet of the molten salt heater (2), and the cold end outlet of the molten salt heater (2) is connected to the inlet of the high-temperature heat storage tank (6). The outlet of the high-temperature heat storage tank (6) is connected to the hot end inlet of the superheater (8) and the hot end inlet of the reheater (15), respectively. The hot end outlet of the superheater (8) and the hot end outlet of the reheater (15) are mixed and then connected to the hot end inlet of the evaporator (9). The hot end outlet of the evaporator (9) is connected to the hot end inlet of the preheater (10). The hot end outlet of the preheater (10) is connected to the inlet of the pump (13). The outlet of the pump (13) is connected to the inlet of the low-temperature heat storage tank (7). One end of the fourth synchronous valve (29) is connected to the cold end inlet of the preheater (10). The cold end outlet of the preheater (10) is connected to the cold end inlet of the evaporator (9). The cold end outlet of the evaporator (9) is connected to the cold end inlet of the superheater (8).

[0005] The working fluid used in the high-temperature thermal storage tank (6) and low-temperature thermal storage tank (7) of the reverse Brayton cycle system can be solar salt, which is a mixture of NaNO3 (60 wt%) and KNO3 (40 wt%). The working fluid in the reverse Brayton cycle system can be CO2 or argon or other gases.

[0006] An operation method for an integrated reverse Brayton cycle cogeneration system is characterized by having two operation methods: a charging cycle and a discharging cycle. During the charging cycle, the excess power from wind, solar, and grid drives the compressor (1) to compress the working fluid to a high-temperature and high-pressure state. The high-temperature and high-pressure working fluid releases heat through the molten salt heater (2) to reach a medium-temperature and high-pressure state, and then enters the regenerator (3) to release heat, becoming a low-temperature and high-pressure state. The working fluid then enters the expander (4) to do work, becoming a low-temperature and low-pressure state. The low-temperature and low-pressure working fluid enters the cold source heater (5) and is heated by the boiler feedwater. The boiler feedwater, after releasing heat, returns to the deaerator (27) to absorb heat. The working fluid then enters the regenerator (3) to absorb heat again, and then enters the compressor (1). The working fluid in the low-temperature heat outlet tank (7) is driven by the pump (11), and after absorbing heat through the molten salt heater (2), it enters the high-temperature heat storage tank (6) for storage. During the discharge cycle, the working fluid in the high-temperature heat storage tank (6) flows to the superheater (8) and the reheater (15) to release heat, heating the steam to the superheat temperature and the reheat temperature. The two streams of working fluid that have released heat are mixed and enter the evaporator (9) to release heat. The boiler feedwater at the cold end outlet of the preheater (10) absorbs heat, and the working fluid that has released heat enters the preheater (10) again to release heat. The working fluid at the outlet of the preheater (10) is driven by the pump (13) to enter the low-temperature heat storage tank (7).

[0007] Charging and discharging cycles can be performed simultaneously.

[0008] In the charging cycle of the reverse Brayton cycle system, the power driving the compressor (1) comes from the power of the wind power, photovoltaic power and generator (23).

[0009] Regardless of the operating method, the working fluid temperature in both heat storage tanks must be maintained above 290℃.

[0010] The charging cycle requires a working fluid in the cryogenic thermal storage tank (7), and the discharging cycle requires a working fluid in the high-temperature thermal storage tank (6). When the charging cycle and the discharging cycle are performed simultaneously, both the cryogenic thermal storage tank (7) and the high-temperature thermal storage tank (6) need to contain working fluid.

[0011] The positive and beneficial effects of this invention are: This invention discloses an integrated reverse Brayton cycle cogeneration system and its operation method. It provides a new approach to the retrofitting of traditional cogeneration units and actively responds to the national "dual carbon" target. The charging cycle converts electrical energy into heat energy storage through the reverse Brayton cycle, absorbing excess electricity in the grid system, reducing grid load, resource consumption, and carbon emissions. Furthermore, the cold source heater uses extracted steam from the high-pressure cylinder. This heat source can improve the heat pump efficiency during the charging process while increasing the steam extraction volume of the high-pressure heater, lowering the lower limit of power generation for coal-fired units, thereby reducing curtailment and increasing the amount of renewable energy that can be fed into the grid. The discharging cycle meets the energy storage requirements for long periods and large capacities by using molten salt cascade heating of boiler feedwater, reducing heat exchange losses, and also lowering power generation costs and coal consumption. The cold source heater uses extracted steam from the high-pressure cylinder. This heat source can improve efficiency while increasing the steam extraction volume of the high-pressure heater, lowering the lower limit of power generation for coal-fired units, reducing curtailment, and increasing the amount of renewable energy that can be fed into the grid. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of a combined heat and power system integrating a reverse Brayton cycle.

[0013] Figure 2 This is a schematic diagram of the charging cycle operation method of an integrated reverse Brayton cycle cogeneration system.

[0014] Figure 3 This is a schematic diagram of the operation method of the discharge cycle of an integrated reverse Brayton cycle cogeneration system.

[0015] Figure 4 This is a schematic diagram of the simultaneous operation of the charging and discharging cycles in a combined heat and power system integrating a reverse Brayton cycle.

[0016] 1-Compressor 2-Molten Salt Heater 3-Regenerator 4-Expander 5-Cold Source Heater 6-High Temperature Heat Storage Tank 7-Low Temperature Heat Storage Tank 8-Superheater 9-Evaporator 10-Preheater 11-Pump 12-Heating Network Heater 13-Pump 14-Coal-fired Boiler 15-Reheater 16-First Synchronous Valve 17-Second Synchronous Valve 18-High Pressure Cylinder 19-Fifth Synchronous Valve 20-Medium Pressure Cylinder 21-Diverter Valve 22-Low Pressure Cylinder 23-Generator 24-Condenser 25-Condensate Pump 26-Third Synchronous Valve 27-Deaerator 28-Feed Water Pump 29-Fourth Synchronous Valve Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and specific examples; it should be emphasized that the following description is merely exemplary and not intended to limit the scope and application of the present invention.

[0018] An integrated reverse Brayton cycle cogeneration system includes a steam turbine system and a reverse Brayton cycle system. The steam outlet of the superheater of the coal-fired boiler (14) of the steam turbine system is connected to one end of a first synchronization valve (16). The other two ends of the first synchronization valve (16) are respectively connected to the inlet of a high-pressure cylinder (18) and the cold end outlet of the superheater (8). The outlet of the high-pressure cylinder (18) is connected to one end of a second synchronization valve (17). The other two ends of the second synchronization valve (17) are respectively connected to the reheater inlet of the coal-fired boiler (14) and the reheater (1... 5) The cold end outlet of the reheater (15) is connected to one end of the fifth synchronization valve (19), and the other two ends of the fifth synchronization valve (19) are connected to the reheater outlet of the coal-fired boiler (14) and the inlet of the intermediate pressure cylinder (20), respectively. The outlet of the intermediate pressure cylinder (20) is connected to the inlet of the diversion valve (21), and the outlet of the diversion valve (21) is connected to the inlet of the low pressure cylinder (22) and the inlet of the heat network heater (12), respectively. The outlet of the low pressure cylinder (22) is connected to the inlet of the condenser (24), and the outlet of the condenser (24) is connected to the condenser. The inlet of the water pump (25) is connected to the outlet of the condensate pump (25), the outlet of the heating network heater (12), and the extraction steam outlet of the intermediate pressure cylinder (20), respectively. The heating network return water is connected to the inlet of the heating network heater (12), the heating network supply water is connected to the outlet of the heating network heater (12), the outlet of the deaerator (27) is connected to the inlet of the feed water pump (28), the outlet of the feed water pump (28) is connected to the cold end inlet of the high pressure heater (30), and the extraction steam inlet of the high pressure heater (30) is connected to the extraction steam outlet of the high pressure cylinder (18). The steam outlet is connected, and the two ends of the third synchronous valve (26) are respectively connected to the cold end outlet of the high pressure heater (30) and one end of the fourth synchronous valve (29). The other end of the third synchronous valve (26) is connected to the hot end inlet of the cold source heater (5). The hot end outlet of the cold source heater (5) is connected to the inlet of the deaerator (27). The two ends of the fourth synchronous valve (29) are respectively connected to one end of the third synchronous valve (26) and the cold end inlet of the preheater (10). The other end of the fourth synchronous valve (29) is connected to the preheater inlet of the coal-fired boiler (14). The outlet of the compressor (1) of the reverse Brayton cycle system is connected to the hot end inlet of the molten salt heater (2), the hot end outlet of the molten salt heater (2) is connected to the hot end inlet of the regenerator (3), the hot end outlet of the regenerator (3) is connected to the inlet of the expander (4), the outlet of the expander (4) is connected to the cold end inlet of the cold source heater (5), the cold end outlet of the cold source heater (5) is connected to the cold end inlet of the regenerator (3), the cold end outlet of the regenerator (3) is connected to the inlet of the compressor (1), the outlet of the low-temperature heat storage tank (7) is connected to the inlet of the pump (11), the outlet of the pump (11) is connected to the cold end inlet of the molten salt heater (2), and the cold end outlet of the molten salt heater (2) is connected to the inlet of the high-temperature heat storage tank (6). The outlet of the high-temperature heat storage tank (6) is connected to the hot end inlet of the superheater (8) and the hot end inlet of the reheater (15), respectively. The hot end outlet of the superheater (8) and the hot end outlet of the reheater (15) are mixed and then connected to the hot end inlet of the evaporator (9). The hot end outlet of the evaporator (9) is connected to the hot end inlet of the preheater (10). The hot end outlet of the preheater (10) is connected to the inlet of the pump (13). The outlet of the pump (13) is connected to the inlet of the low-temperature heat storage tank (7). One end of the fourth synchronous valve (29) is connected to the cold end inlet of the preheater (10). The cold end outlet of the preheater (10) is connected to the cold end inlet of the evaporator (9). The cold end outlet of the evaporator (9) is connected to the cold end inlet of the superheater (8).

[0019] The working fluid used in the high-temperature thermal storage tank (6) and low-temperature thermal storage tank (7) of the reverse Brayton cycle system can be solar salt, which is a mixture of NaNO3 (60 wt%) and KNO3 (40 wt%). The working fluid in the reverse Brayton cycle system can be CO2 or argon or other gases.

[0020] An operation method of an integrated reverse Brayton cycle cogeneration system is characterized in that the integrated reverse Brayton cycle system has two operation methods: charging cycle and discharging cycle. During the charging cycle, the excess power from wind power, solar power and the power grid drives the compressor (1) to compress the working fluid to a high temperature and high pressure state. The high temperature and high pressure working fluid releases heat through the molten salt heater (2) and reaches a medium temperature and high pressure state. Then it enters the regenerator (3) to release heat and becomes a low temperature and high pressure state. Then the working fluid enters the expander (4) to do work and becomes a low temperature and low pressure state. The low temperature and low pressure working fluid enters the cold source heater (5) and is heated by the boiler feedwater. The boiler feedwater after releasing heat returns to the deaerator (27). The working fluid after absorbing heat enters the regenerator (3) to absorb heat again and then enters the compressor (1). The working fluid in the low temperature heat outlet tank (7) is driven by the pump (11) and enters the high temperature heat storage tank (6) for storage after absorbing heat through the molten salt heater (2).

[0021] During the discharge cycle, the working fluid in the high-temperature heat storage tank (6) flows to the superheater (8) and reheater (15) respectively to release heat, heating the steam to the superheat temperature and reheat temperature. The two working fluids after releasing heat are mixed and enter the evaporator (9) to release heat. The boiler feedwater at the cold end outlet of the preheater (10) absorbs heat. The working fluid after releasing heat enters the preheater (10) again to release heat. The working fluid at the outlet of the preheater (10) is driven by the pump (13) into the low-temperature heat storage tank (7).

[0022] Charging and discharging cycles can be performed simultaneously.

[0023] In the charging cycle of the reverse Brayton cycle system, the power driving the compressor (1) comes from the power of the wind power, photovoltaic power and generator (23).

[0024] Regardless of the operating method, the working fluid temperature in both heat storage tanks must be maintained above 290℃.

[0025] The charging cycle requires a working fluid in the cryogenic thermal storage tank (7), and the discharging cycle requires a working fluid in the high-temperature thermal storage tank (6). When the charging cycle and the discharging cycle are performed simultaneously, both the cryogenic thermal storage tank (7) and the high-temperature thermal storage tank (6) need to contain working fluid.

[0026] This invention discloses an integrated reverse Brayton cycle cogeneration system and its operation method. It provides a new approach to the retrofitting of traditional cogeneration units and actively responds to the national "dual carbon" target. The charging cycle converts electrical energy into heat energy storage through the reverse Brayton cycle, absorbing excess electricity in the grid system, reducing grid load, resource consumption, and carbon emissions. Furthermore, the cold source heater uses extracted steam from the high-pressure cylinder. This heat source can improve the heat pump efficiency during the charging process while increasing the steam extraction volume of the high-pressure heater, lowering the lower limit of power generation for coal-fired units, thereby reducing curtailment and increasing the amount of renewable energy that can be fed into the grid. The discharging cycle meets the energy storage requirements for long periods and large capacities by using molten salt cascade heating of boiler feedwater, reducing heat exchange losses, and also lowering power generation costs and coal consumption. The cold source heater uses extracted steam from the high-pressure cylinder. This heat source can improve efficiency while increasing the steam extraction volume of the high-pressure heater, lowering the lower limit of power generation for coal-fired units, reducing curtailment, and increasing the amount of renewable energy that can be fed into the grid.

[0027] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention; therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A combined heat and power system integrating a reverse Brayton cycle, characterized in that, The system includes a steam turbine system and a reverse Brayton cycle system; the steam outlet of the superheater of the coal-fired boiler (14) of the steam turbine system is connected to one end of a first synchronizing valve (16), the other two ends of the first synchronizing valve (16) are respectively connected to the inlet of the high-pressure cylinder (18) and the cold end outlet of the superheater (8), the outlet of the high-pressure cylinder (18) is connected to one end of a second synchronizing valve (17), the other two ends of the second synchronizing valve (17) are respectively connected to the inlet of the reheater of the coal-fired boiler (14) and the cold end outlet of the reheater (15), and the reheater... The cold end inlet of (15) is connected to one end of the fifth synchronization valve (19). The other two ends of the fifth synchronization valve (19) are connected to the reheater outlet of the coal-fired boiler (14) and the inlet of the intermediate pressure cylinder (20), respectively. The outlet of the intermediate pressure cylinder (20) is connected to the inlet of the diversion valve (21). The outlet of the diversion valve (21) is connected to the inlet of the low pressure cylinder (22) and the inlet of the heat network heater (12), respectively. The outlet of the low pressure cylinder (22) is connected to the inlet of the condenser (24). The outlet of the condenser (24) is connected to the inlet of the condensate pump (25). The inlet of the deaerator (27) is connected to the outlet of the condensate pump (25), the outlet of the heating network heater (12), and the extraction steam outlet of the intermediate pressure cylinder (20), respectively. The heating network return water is connected to the inlet of the heating network heater (12), and the heating network supply water is connected to the outlet of the heating network heater (12). The outlet of the deaerator (27) is connected to the inlet of the feed water pump (28), and the outlet of the feed water pump (28) is connected to the cold end inlet of the high pressure heater (30). The extraction steam inlet of the high pressure heater (30) is connected to the extraction steam outlet of the high pressure cylinder (18). The two ends of the third synchronization valve (26) are respectively connected to the cold end outlet of the high pressure heater (30) and one end of the fourth synchronization valve (29). The other end of the third synchronization valve (26) is connected to the hot end inlet of the cold source heater (5). The hot end outlet of the cold source heater (5) is connected to the inlet of the deaerator (27). The two ends of the fourth synchronization valve (29) are respectively connected to one end of the third synchronization valve (26) and the cold end inlet of the preheater (10). The other end of the fourth synchronization valve (29) is connected to the preheater inlet of the coal-fired boiler (14).The outlet of the compressor (1) of the reverse Brayton cycle system is connected to the hot end inlet of the molten salt heater (2), the hot end outlet of the molten salt heater (2) is connected to the hot end inlet of the regenerator (3), the hot end outlet of the regenerator (3) is connected to the inlet of the expander (4), the outlet of the expander (4) is connected to the cold end inlet of the cold source heater (5), the cold end outlet of the cold source heater (5) is connected to the cold end inlet of the regenerator (3), the cold end outlet of the regenerator (3) is connected to the inlet of the compressor (1), the outlet of the low-temperature heat storage tank (7) is connected to the inlet of the pump (11), the outlet of the pump (11) is connected to the cold end inlet of the molten salt heater (2), and the cold end outlet of the molten salt heater (2) is connected to the inlet of the high-temperature heat storage tank (6). The outlet of the high-temperature heat storage tank (6) is connected to the hot end inlet of the superheater (8) and the hot end inlet of the reheater (15), respectively. The hot end outlet of the superheater (8) and the hot end outlet of the reheater (15) are mixed and then connected to the hot end inlet of the evaporator (9). The hot end outlet of the evaporator (9) is connected to the hot end inlet of the preheater (10). The hot end outlet of the preheater (10) is connected to the inlet of the pump (13). The outlet of the pump (13) is connected to the inlet of the low-temperature heat storage tank (7). One end of the fourth synchronization valve (29) is connected to the cold end inlet of the preheater (10). The cold end outlet of the preheater (10) is connected to the cold end inlet of the evaporator (9). The cold end outlet of the evaporator (9) is connected to the cold end inlet of the superheater (8).

2. The integrated reverse Brayton cycle cogeneration system according to claim 1, characterized in that, The working fluid used in the high-temperature thermal storage tank (6) and low-temperature thermal storage tank (7) of the reverse Brayton cycle system can be solar salt, which is a mixture of NaNO3 (60 wt%) and KNO3 (40 wt%). The working fluid in the reverse Brayton cycle system can be CO2 or argon or other gases.

3. An operation method for an integrated reverse Brayton cycle cogeneration system, characterized in that, The integrated reverse Brayton cycle system has two operating methods: charging cycle and discharging cycle. During the charging cycle, the excess power from wind power, solar power, and the power grid drives the compressor (1) to compress the working fluid to a high temperature and high pressure state. After the high temperature and high pressure working fluid releases heat through the molten salt heater (2), it reaches a medium temperature and high pressure state. Then, it enters the regenerator (3) to release heat and becomes a low temperature and high pressure state. After that, the working fluid enters the expander (4) to do work and becomes a low temperature and low pressure state. The low temperature and low pressure working fluid enters the cold source heater (5) and is heated by the boiler feedwater. The boiler feedwater that has released heat returns to the deaerator (27). The working fluid that has absorbed heat enters the regenerator (3) to absorb heat again. The heat is then introduced into the compressor (1). The working fluid in the low-temperature heat tank (7) is driven by the pump (11), and after absorbing heat through the molten salt heater (2), it enters the high-temperature heat storage tank (6) for storage. During the discharge cycle, the working fluid in the high-temperature heat storage tank (6) flows to the superheater (8) and the reheater (15) respectively to release heat, heating the steam to the superheat temperature and the reheat temperature. The two working fluids after releasing heat are mixed and enter the evaporator (9) to release heat. The boiler feedwater at the cold end outlet of the preheater (10) absorbs heat, and the working fluid after releasing heat enters the preheater (10) again to release heat. The working fluid at the outlet of the preheater (10) is driven by the pump (13) into the low-temperature heat storage tank (7).

4. The operation method of an integrated reverse Brayton cycle cogeneration system according to claim 3, characterized in that, Charging and discharging cycles can be performed simultaneously.

5. The operation method of an integrated reverse Brayton cycle cogeneration system according to claim 3, characterized in that, In the charging cycle of the reverse Brayton cycle system, the power driving the compressor (1) comes from the power of the wind power, photovoltaic power and generator (23).

6. The operation method of an integrated reverse Brayton cycle cogeneration system according to claim 3, characterized in that, Regardless of the operating method, the working fluid temperature in both heat storage tanks must be maintained above 290℃.

7. The operation method of an integrated reverse Brayton cycle cogeneration system according to claim 3, characterized in that, The charging cycle requires a working fluid in the cryogenic thermal storage tank (7), and the discharging cycle requires a working fluid in the high-temperature thermal storage tank (6). When the charging cycle and the discharging cycle are performed simultaneously, both the cryogenic thermal storage tank (7) and the high-temperature thermal storage tank (6) need to contain working fluid.

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