Photovoltaic coupling high-temperature heat pump fused salt energy storage cogeneration system

Abstract

The utility model discloses a photovoltaic coupling high-temperature heat pump fused salt energy storage combined heat and power system. The system comprises a high-temperature heat pump energy storage module, a fused salt energy storage module, a steam generation module and a combined heat and power module. According to the high-temperature heat pump energy storage module, a photovoltaic power generation assembly is connected with a power supply controller, the power supply controller is connected with a motor, the motor is coaxially connected with an air compressor and an air turbine, and the air turbine is connected with an air-molten salt heat exchanger; according to the fused salt energy storage module, a fused salt electric heater is connected with a high-temperature fused salt storage tank, and a low-temperature fused salt storage tank is connected with an air-fused salt heat exchanger. According to the steam generation module, a water supply preheater is connected with a water supply evaporator, the water supply evaporator is connected with a water supply superheater, and the water supply superheater is connected with a steam turbine. The steam turbine is connected with the generator, the steam condenser is connected with the steam turbine, the steam condenser is connected with the condensate pump, and the condensate pump is connected with the low-pressure heater set. According to the system, a cascade energy storage mode is adopted, and unstable photovoltaic power generation is converted into stable electric energy output.

Description

Technical Field

[0001] The utility model belongs to the field of heat storage and energy supply, and specifically relates to a photovoltaic coupled high-temperature heat pump molten salt energy storage and heat and power cogeneration system. Background Art

[0002] Photovoltaic power generation is greatly affected by environmental factors such as solar radiation, and has the characteristics of randomness and volatility. This makes the energy output of photovoltaic power generation systems relatively unstable, and requires backup energy as a supplement, which restricts the further development of the photovoltaic industry. There are two main reasons. First, the installed capacity of photovoltaics has increased significantly, and the unstable power generation has increased the difficulty of regulating the power grid, affecting the safe operation of the power grid; second, when the load on the power consumption side increases, the power on the power generation side is difficult to meet. The current solution is to peak-shaving coal-fired power plants or add a large amount of photovoltaic installed capacity, but when the photovoltaic power generation exceeds the capacity of the power grid, it is forced to abandon light. The development of energy storage technology and system integration are the key to solving this problem. The current mainstream energy storage technologies are pumped energy storage, electrochemical energy storage, and compressed air energy storage. Pumped energy storage has a low cost and mature technology, but the construction site is restricted by water resources and geographical conditions, and its promotion and application are limited. Electrochemical energy storage still has problems in terms of life and safety. At the same time, the energy storage cost is relatively high, and it does not have the conditions for large-scale application. Compressed air energy storage also requires resource conditions such as caves to have application value.

[0003] Therefore, there is an urgent need for a system that can convert unstable photovoltaic or existing photovoltaic power generation into stable power output and provide green, clean, stable, and power supply to the power grid. Utility Model Content

[0004] In order to solve the deficiencies in the prior art, the utility model provides a photovoltaic-coupled high-temperature heat pump molten salt energy storage cogeneration system. The technical principle is to store unstable photovoltaic or stock photovoltaic power generation in molten salt through electric-thermal conversion. When generating electricity, steam is generated through a steam generation module to drive a steam turbine generator to generate electricity, providing a green, clean and stable power supply, and can realize cogeneration of heat and power as needed.

[0005] The utility model adopts the following technical solutions.

[0006] A photovoltaic coupled high-temperature heat pump molten salt energy storage cogeneration system, comprising: a high-temperature heat pump energy storage module, a molten salt energy storage module, a steam generation module and a cogeneration module, wherein the high-temperature heat pump energy storage module comprises: a photovoltaic power generation component, a power controller, a motor, an air compressor, an air turbine and an air-molten salt heat exchanger; the photovoltaic power generation component is connected to the power controller, the power controller is connected to the motor, the motor is coaxially connected to the air compressor and the air turbine, and the air turbine is connected to the air-molten salt heat exchanger;

[0007] The molten salt energy storage module comprises: a molten salt electric heater, a high-temperature molten salt storage tank, and a low-temperature molten salt storage tank; the molten salt side outlet of the air-molten salt heat exchanger in the high-temperature heat pump energy storage module is connected to the inlet of the molten salt electric heater, the outlet of the molten salt electric heater is connected to the high-temperature molten salt storage tank, and the outlet of the low-temperature molten salt storage tank is connected to the inlet of the air-molten salt heat exchanger;

[0008] The steam generation module comprises: a feedwater preheater, a feedwater evaporator, a feedwater superheater and a steam turbine; the low-temperature molten salt storage tank in the molten salt energy storage module is connected to the feedwater preheater, the feedwater preheater is connected to the feedwater evaporator, the feedwater evaporator is connected to the feedwater superheater, and the feedwater superheater is connected to the turbine inlet;

[0009] The cogeneration module includes: a generator, a condenser, a condensate pump and a low-pressure heater group; the feed water pump outlet is connected to the water side inlet of the feed water preheater in the steam generation module, the steam turbine is connected to the generator, the condenser is connected to the steam turbine, the condenser is connected to the condensate pump, and the condensate pump is connected to the low-pressure heater group.

[0010] Preferably, the high-temperature heat pump energy storage module further includes an air regenerator and an air preheater, the air regenerator is connected to the air compressor, the air-molten salt heat exchanger is connected to the air regenerator, and the air turbine is connected to the air preheater inlet.

[0011] Preferably, the air-molten salt heat exchanger is provided with an air side inlet, an air side outlet, a molten salt side outlet and a molten salt side inlet; the air outlet of the air regenerator is connected to the air compressor inlet, the air compressor outlet is connected to the air side inlet of the air-molten salt heat exchanger, the air side outlet of the air-molten salt heat exchanger is connected to the air regenerator inlet, the air regenerator outlet is connected to the air turbine inlet, and the air turbine outlet is connected to the air preheater inlet.

[0012] Preferably, the molten salt energy storage module further includes a low-temperature molten salt pump and a high-temperature molten salt pump, the low-temperature molten salt storage tank is connected to the low-temperature molten salt pump, and the high-temperature molten salt storage tank is connected to the high-temperature molten salt pump.

[0013] Preferably, the feedwater preheater is further provided with a water side inlet and a water side outlet; the feedwater evaporator is further provided with a water side inlet and a water side outlet; the feedwater superheater is further provided with a steam side outlet and a water side inlet;

[0014] The water side outlet of the feedwater preheater is connected to the water side inlet of the feedwater evaporator, the water side outlet of the feedwater evaporator is connected to the water side inlet of the feedwater superheater, and the steam side outlet of the feedwater superheater is connected to the turbine inlet.

[0015] Preferably, the feed water preheater, feed water evaporator and feed water superheater are all provided with a molten salt side inlet and a molten salt side outlet;

[0016] The high-temperature molten salt pump outlet is connected to the molten salt side inlet of the water feed superheater, the molten salt side outlet of the water feed superheater is connected to the molten salt side inlet of the water feed evaporator, the molten salt side outlet of the water feed evaporator is connected to the molten salt side inlet of the water feed preheater, and the molten salt side outlet of the water feed preheater is connected to the low-temperature molten salt storage tank.

[0017] Preferably, the low-pressure heater group includes a first low-pressure heater, a second low-pressure heater and a third low-pressure heater, and the first low-pressure heater, the second low-pressure heater and the third low-pressure heater are connected in series.

[0018] Preferably, the cogeneration module also includes a deaerator and a feed water pump, the outlet of the third low-pressure heater is connected to the deaerator, the outlet of the low-pressure heater group is connected to the deaerator, the outlet of the deaerator is connected to the feed water pump, and the outlet of the feed water pump is connected to the water side inlet of the feed water preheater.

[0019] Preferably, the deaerator steam extraction pipeline is provided with a steam extraction valve for providing heating steam to users.

[0020] Preferably, the photovoltaic-coupled high-temperature heat pump molten salt energy storage cogeneration system also includes a first circulating water pump and a second circulating water pump; the first circulating water pump is arranged at the end of the condenser, and the second circulating water pump is arranged at the water side outlet of the air preheater.

[0021] The beneficial effect of the utility model is that, compared with the prior art, the system adopts a cascade energy storage mode, using unstable photovoltaic power generation to reversely heat the molten salt temperature to 350°C through a high-temperature heat pump system. The molten salt electric heater further heats the salt temperature to 600°C and stores it in a high-temperature storage tank. When generating electricity, the high-temperature molten salt heats the turbine feed water to generate superheated steam, which in turn drives the turbine generator to generate electricity, converting unstable photovoltaic power generation into stable power output, providing green, clean, stable, and power supply to the power grid. At the same time, it has a steam supply function, which increases the photovoltaic absorption ratio and enhances the adjustment flexibility of the power grid. The circulating cooling water is recycled within the system, which reduces the cold end loss and improves the comprehensive energy utilization efficiency. The high-temperature heat pump energy storage module improves the system's electricity-to-electricity conversion efficiency, with significant economic benefits. The details are as follows:

[0022] (1) The high-temperature heat pump module is coupled with the molten salt energy storage module, and a cascade energy storage mode is adopted. The unstable photovoltaic power generation is used to reversely heat the molten salt to 350°C through the heat pump module, and the molten salt electric heater further increases the salt temperature to 600°C, with high heating efficiency.

[0023] (2) The system COP (heating efficiency) is higher than that of a single electric heater, up to 1.5, and the system electric-to-electric conversion efficiency is increased from 35% to 52%. The comprehensive energy utilization efficiency can reach 70%, which is comparable to the efficiency of a compressed air energy storage power station.

[0024] (3) A regenerator is added to the high-temperature heat pump energy storage module, which increases the inlet air temperature of the air compressor and reduces the pressure ratio of the air compressor. The circulating cooling water is circulated within the system, reducing the cold end loss and achieving significant energy-saving effects.

[0025] (4) The system uses a cascaded energy storage and regeneration mode to achieve stable access to the grid for photovoltaic power abandonment and unstable power generation, solving the current problem of large-scale photovoltaic power abandonment. The system can also provide green, clean, stable, and power supply to the power grid, enhancing the adjustment flexibility of the power grid, while providing heating needs for heat users, with significant economic benefits;

[0026] (5) The system can absorb 1.248 million MWh of photovoltaic electricity annually, which is equivalent to saving 500,000 tons of standard coal and reducing 1.24 million tons of carbon dioxide emissions, with significant social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of a photovoltaic coupled high temperature heat pump molten salt energy storage combined heat and power system;

[0028] In the figure: 1. Photovoltaic power generation component; 2. Power controller; 3. Motor; 4. Air compressor; 5. Air turbine; 6. Air-molten salt heat exchanger; 7. Air regenerator; 8. Air preheater; 9. Molten salt electric heater; 10. High-temperature molten salt storage tank; 11. Low-temperature molten salt storage tank; 12. Low-temperature molten salt pump; 13. High-temperature molten salt pump; 14. Feed water preheater; 15. Feed water evaporator; 16. Feed water superheater; 17. Steam turbine; 18. Generator; 19. Condenser; 20. Condensate pump; 21. First low-pressure heater; 22. Second low-pressure heater; 23. Third low-pressure heater; 24. Deaerator; 25. Extraction valve; 26. Feed water pump; 27. First circulating water pump; 28. Second circulating water pump. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. The embodiments described in this application are only part of the embodiments of the utility model, not all of them. Based on the spirit of the utility model, other embodiments obtained by ordinary technicians in this field without creative work are all within the scope of protection of the utility model.

[0030] like Figure 1 As shown, Example 1 of the utility model provides a photovoltaic-coupled high-temperature heat pump molten salt energy storage cogeneration system, including a high-temperature heat pump energy storage module, a molten salt energy storage module, a steam generation module and a cogeneration module.

[0031] 1. High-temperature heat pump energy storage module, including: photovoltaic power generation component 1, power controller 2, motor 3, air compressor 4, air turbine 5, air-molten salt heat exchanger 6, air regenerator 7 and air preheater 8;

[0032] The photovoltaic power generation component 1 is connected to the power controller 2, the power controller 2 is connected to the motor 3, the motor 3 is coaxially connected with the air compressor 4 and the air turbine 5, the compressed air preheated by the air preheater 8 enters the air regenerator 7, and the air outlet of the air regenerator 7 is connected to the inlet of the air compressor 4;

[0033] The air-molten salt heat exchanger 6 is provided with an air side inlet, an air side outlet, a molten salt side outlet and a molten salt side inlet;

[0034] The outlet of the air compressor 4 is connected to the air side inlet of the air-molten salt heat exchanger 6, the air side outlet of the air-molten salt heat exchanger 6 is connected to the inlet of the air regenerator 7, the outlet of the air regenerator 7 is connected to the inlet of the air turbine 5, and the outlet of the air turbine 5 is connected to the inlet of the air preheater 8.

[0035] 2. Molten salt energy storage module, including: molten salt electric heater 9, high temperature molten salt storage tank 10, low temperature molten salt storage tank 11;

[0036] The low-temperature molten salt storage tank 11 is connected to the low-temperature molten salt pump 12 , the molten salt side outlet of the air-molten salt heat exchanger 6 is connected to the inlet of the molten salt electric heater 9 , the outlet of the molten salt electric heater 9 is connected to the high-temperature molten salt storage tank 10 , and the high-temperature molten salt storage tank 10 is connected to the high-temperature molten salt pump 13 .

[0037] In a preferred but non-limiting embodiment of the present invention, the molten salt energy storage module further includes: a low-temperature molten salt pump 12 and a high-temperature molten salt pump 13 , wherein the low-temperature molten salt storage tank 11 is connected to the low-temperature molten salt pump 12 , and the high-temperature molten salt storage tank 10 is connected to the high-temperature molten salt pump 13 .

[0038] 3. Steam generation module, including: feed water preheater 14, feed water evaporator 15, feed water superheater 16 and steam turbine 17;

[0039] The feed water preheater 14, the feed water evaporator 15, and the feed water superheater 16 are all provided with a molten salt side inlet and a molten salt side outlet;

[0040] The feed water preheater 14 is also provided with a water side outlet and a water side inlet;

[0041] The water supply evaporator 15 is also provided with a water side inlet and a water side outlet;

[0042] The feedwater superheater 16 is also provided with a steam side outlet and a water side inlet;

[0043] The water side outlet of the feed water preheater 14 is connected to the water side inlet of the feed water evaporator 15, the water side outlet of the feed water evaporator 15 is connected to the water side inlet of the feed water superheater 16, and the steam side outlet of the feed water superheater 16 is connected to the inlet of the steam turbine 17; the outlet of the high-temperature molten salt pump 13 is connected to the molten salt side inlet of the feed water superheater 16, the molten salt side outlet of the feed water superheater 16 is connected to the molten salt side inlet of the feed water evaporator 15, the molten salt side outlet of the feed water evaporator 15 is connected to the molten salt side inlet of the feed water preheater 14, and the molten salt side outlet of the feed water preheater 14 is connected to the low-temperature molten salt storage tank 11.

[0044] 4. The combined heat and power module includes: a generator 18, a condenser 19, a condensate pump 20, a low-pressure heater group, a deaerator 24 and a feed water pump 26.

[0045] The steam turbine 17 is connected to the generator 18, the condenser 19 is connected to the steam turbine 17, the condenser 19 is connected to the condensate pump 20, the condensate pump 20 is connected to the low-pressure heater group, the low-pressure heater group is connected to the deaerator 24, the outlet of the deaerator 24 is connected to the feed water pump 26, and the outlet of the feed water pump 26 is connected to the water side inlet of the feed water preheater 14;

[0046] In a preferred but non-limiting embodiment of the utility model, the low-pressure heater group includes a first low-pressure heater 21, a second low-pressure heater 22 and a third low-pressure heater 23, the first low-pressure heater 21, the second low-pressure heater 22 and the third low-pressure heater 23 are connected in series, and the outlet of the third low-pressure heater 23 is connected to a deaerator 24.

[0047] Further preferably, a steam extraction valve 25 is installed on the steam extraction pipeline of the deaerator 24 to provide heating steam to users.

[0048] The photovoltaic coupled high-temperature heat pump molten salt energy storage cogeneration system also includes a first circulating water pump 27 and a second circulating water pump 28; the first circulating water pump 27 is arranged at the end of the condenser 19, and is used to pump the circulating cooling water of the power plant to the air preheater 8 to recover the heat energy in the circulating water of the power plant; the second circulating water pump 28 is arranged at the water side outlet of the air preheater 8, and is used to pump the circulating water after recovering the heat energy to the condenser 19 for the next exhaust steam condensation.

[0049] The working process of the photovoltaic coupled high temperature heat pump molten salt energy storage cogeneration module described in the utility model is as follows:

[0050] (1) High temperature heat pump energy storage process:

[0051] The unstable photovoltaic power generation energy is used to drive the air compressor 4 to compress the air to a high temperature and high pressure state. The high temperature and high pressure air exchanges heat with the cold molten salt with a temperature of 200°C from the low temperature molten salt storage tank 11 in the air-molten salt heat exchanger 6. The low temperature molten salt is heated to 350°C and then enters the molten salt electric heater 9. The medium temperature and high pressure air after heat exchange enters the air regenerator 7 to heat the cold air circulating in the system. The medium temperature and high pressure air is further cooled to high pressure and low temperature air and enters the air turbine 5. The high pressure and low temperature air expands and does work in the turbine 5. Since the motor 3, the compressor 4, and the turbine 5 are coaxially connected, the work done by the air in the turbine 5 offsets part of the compression power consumption, thereby reducing the overall power consumption of the system. After the work is done, the low temperature and low pressure air enters the air preheater 8 to exchange heat with the circulating cooling water after the exhaust steam heat exchange from the condenser 19. After the air temperature rises, it enters the air regenerator 7 to absorb heat. After the temperature further rises, it enters the air compressor 4 to carry out the next compression cycle.

[0052] (2) Molten salt energy storage process:

[0053] The cold molten salt with a temperature of 200°C in the low-temperature molten salt storage tank 11 is pumped out by the low-temperature molten salt pump 12 and enters the air-molten salt heat exchanger 6 for heat exchange. After the salt temperature is heated to 350°C, it enters the molten salt electrode heater 9. The molten salt electrode heater 9 further heats the salt temperature to 600°C and stores it in the high-temperature molten salt storage tank 10.

[0054] (3) Steam generation process:

[0055] When the system releases heat, the high-temperature molten salt pump 13 is turned on to extract the high-temperature molten salt from the high-temperature molten salt storage tank 10 and sequentially enter the shell side of the feed water superheater 16, the tube side of the feed water evaporator 15, and the shell side of the feed water preheater 14. After the heat is released, the temperature of the low-temperature molten salt drops to 200°C and then enters the low-temperature molten salt storage tank 11 for storage and waits for the next heat storage cycle; the feed water heated by the low-pressure heater group and the deaerator 24 is pressurized by the feed water pump 26 and sequentially enters the tube side of the feed water preheater 14, the shell side of the feed water evaporator 15, and the tube side of the feed water superheater 16 to absorb heat and evaporate into superheated steam and enter the steam turbine 17.

[0056] (4) Combined heat and power process:

[0057] High-temperature and high-pressure superheated steam enters the steam turbine 17 to expand and do work to output stable electrical energy. The exhaust steam enters the condenser 19 to exchange heat with the circulating cooling water. The exhaust steam is condensed into condensed water and then pumped to the low-pressure heater group through the condensate pump 20. The heating steam of the low-pressure heater group is provided by the extraction steam of the steam turbine 17. The condensed water is heated in the low-pressure heater group and then enters the deaerator 24. The dissolved oxygen in the water is removed by extraction steam heating and then boosted by the feed water pump 26 and then enters the feed water preheater 14 to absorb heat. After the circulating cooling water exchanges heat with the exhaust steam, the temperature rises and enters the air preheater 8 to heat the high-temperature heat pump module ring cooling air. The circulating water after heat release enters the condenser 19 for the next heat exchange with the exhaust steam. An extraction valve 25 is installed on the extraction steam pipeline of the deaerator 24 to provide heating steam for users.

[0058] The beneficial effect of the utility model is that, compared with the prior art, the system adopts a cascade energy storage mode, using unstable photovoltaic power generation to reversely heat the molten salt temperature to 350°C through a high-temperature heat pump system. The molten salt electric heater further heats the salt temperature to 600°C and stores it in a high-temperature storage tank. When generating electricity, the high-temperature molten salt heats the turbine feed water to generate superheated steam, which in turn drives the turbine generator to generate electricity, converting unstable photovoltaic power generation into stable electrical energy output, providing green, clean, stable, and power supply to the power grid. At the same time, it has a steam supply function, which increases the photovoltaic absorption ratio and enhances the adjustment flexibility of the power grid. The circulating cooling water is recycled within the system, which reduces the cold end loss and improves the overall energy utilization efficiency. The high-temperature heat pump energy storage system improves the system's electricity-to-electricity conversion efficiency, with significant economic benefits. The details are as follows:

[0059] (1) The high-temperature heat pump system is coupled with the molten salt energy storage system, and a cascade energy storage mode is adopted. The unstable photovoltaic power generation is used to reversely heat the molten salt to 350°C through the heat pump system. The molten salt electric heater further increases the salt temperature to 600°C, with high heating efficiency.

[0060] (2) The system COP (heating efficiency) is higher than that of a single electric heater, up to 1.5, and the system electric-to-electric conversion efficiency is increased from 35% to 52%. The comprehensive energy utilization efficiency can reach 70%, which is comparable to the efficiency of a compressed air energy storage power station.

[0061] (3) Adding a regenerator to the high-temperature heat pump energy storage system increases the inlet air temperature of the air compressor, reduces the pressure ratio of the air compressor, and circulates cooling water in the system, reducing cold end losses and achieving significant energy-saving effects;

[0062] (4) The system uses a cascaded energy storage and regeneration mode to achieve stable access to the grid for photovoltaic power abandonment and unstable power generation, solving the current problem of large-scale photovoltaic power abandonment. The system can also provide green, clean, stable, and power supply to the power grid, enhancing the adjustment flexibility of the power grid, while providing heating needs for heat users, with significant economic benefits;

[0063] (5) The system can absorb 1.248 million MWh of photovoltaic electricity annually, which is equivalent to saving 500,000 tons of standard coal and reducing 1.24 million tons of carbon dioxide emissions, with significant social benefits.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model is described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the utility model can still be modified or replaced by equivalents, and any modifications or equivalent replacements that do not depart from the spirit and scope of the utility model should be included in the scope of protection of the claims of the utility model.

Claims

1. A photovoltaic coupled high temperature heat pump molten salt energy storage cogeneration system, comprising: High temperature heat pump energy storage module, molten salt energy storage module, steam generation module and combined heat and power module, characterized by: The high-temperature heat pump energy storage module comprises: a photovoltaic power generation component, a power controller, a motor, an air compressor, an air turbine and an air-molten salt heat exchanger; the photovoltaic power generation component is connected to the power controller, the power controller is connected to the motor, the motor is coaxially connected to the air compressor and the air turbine, and the air turbine is connected to the air-molten salt heat exchanger; The molten salt energy storage module comprises: a molten salt electric heater, a high-temperature molten salt storage tank, and a low-temperature molten salt storage tank; the molten salt side outlet of the air-molten salt heat exchanger in the high-temperature heat pump energy storage module is connected to the inlet of the molten salt electric heater, the outlet of the molten salt electric heater is connected to the high-temperature molten salt storage tank, and the outlet of the low-temperature molten salt storage tank is connected to the inlet of the air-molten salt heat exchanger; The steam generation module comprises: a feedwater preheater, a feedwater evaporator, a feedwater superheater and a steam turbine; the low-temperature molten salt storage tank in the molten salt energy storage module is connected to the feedwater preheater, the feedwater preheater is connected to the feedwater evaporator, the feedwater evaporator is connected to the feedwater superheater, and the feedwater superheater is connected to the turbine inlet; The cogeneration module includes: a generator, a condenser, a condensate pump and a low-pressure heater group; the feed water pump outlet is connected to the water side inlet of the feed water preheater in the steam generation module, the steam turbine is connected to the generator, the condenser is connected to the steam turbine, the condenser is connected to the condensate pump, and the condensate pump is connected to the low-pressure heater group.

2. A photovoltaic coupled high temperature heat pump molten salt energy storage cogeneration system according to claim 1, characterized in that: The high-temperature heat pump energy storage module also includes an air regenerator and an air preheater. The air regenerator is connected to the air compressor, the air-molten salt heat exchanger is connected to the air regenerator, and the air turbine is connected to the air preheater inlet.

3. A photovoltaic coupled high temperature heat pump molten salt energy storage cogeneration system according to claim 2, characterized in that: The air-molten salt heat exchanger is provided with an air side inlet, an air side outlet, a molten salt side outlet and a molten salt side inlet; the air outlet of the air regenerator is connected to the air compressor inlet, the air compressor outlet is connected to the air side inlet of the air-molten salt heat exchanger, the air side outlet of the air-molten salt heat exchanger is connected to the air regenerator inlet, the air regenerator outlet is connected to the air turbine inlet, and the air turbine outlet is connected to the air preheater inlet.

4. A photovoltaic coupled high temperature heat pump molten salt energy storage cogeneration system according to claim 1, characterized in that: The molten salt energy storage module also includes a low-temperature molten salt pump and a high-temperature molten salt pump. The low-temperature molten salt storage tank is connected to the low-temperature molten salt pump, and the high-temperature molten salt storage tank is connected to the high-temperature molten salt pump.

5. A photovoltaic coupled high temperature heat pump molten salt energy storage cogeneration system according to claim 1, characterized in that: The feedwater preheater is also provided with a water side inlet and a water side outlet; the feedwater evaporator is also provided with a water side inlet and a water side outlet; the feedwater superheater is also provided with a steam side outlet and a water side inlet; The water side outlet of the feedwater preheater is connected to the water side inlet of the feedwater evaporator, the water side outlet of the feedwater evaporator is connected to the water side inlet of the feedwater superheater, and the steam side outlet of the feedwater superheater is connected to the turbine inlet.

6. A photovoltaic coupled high temperature heat pump molten salt energy storage cogeneration system according to claim 5, characterized in that: The feed water preheater, feed water evaporator and feed water superheater are all provided with a molten salt side inlet and a molten salt side outlet; The high-temperature molten salt pump outlet is connected to the molten salt side inlet of the water feed superheater, the molten salt side outlet of the water feed superheater is connected to the molten salt side inlet of the water feed evaporator, the molten salt side outlet of the water feed evaporator is connected to the molten salt side inlet of the water feed preheater, and the molten salt side outlet of the water feed preheater is connected to the low-temperature molten salt storage tank.

7. A photovoltaic coupled high temperature heat pump molten salt energy storage cogeneration system according to claim 1, characterized in that: The low-pressure heater group includes a first low-pressure heater, a second low-pressure heater and a third low-pressure heater, and the first low-pressure heater, the second low-pressure heater and the third low-pressure heater are connected in series.

8. A photovoltaic coupled high temperature heat pump molten salt energy storage cogeneration system according to claim 1, characterized in that: The cogeneration module also includes a deaerator and a feed water pump. The outlet of the third low-pressure heater is connected to the deaerator, the outlet of the low-pressure heater group is connected to the deaerator, the outlet of the deaerator is connected to the feed water pump, and the outlet of the feed water pump is connected to the water side inlet of the feed water preheater.

9. A photovoltaic coupled high temperature heat pump molten salt energy storage cogeneration system according to claim 8, characterized in that: The deaerator steam extraction pipeline is provided with a steam extraction valve for providing heating steam to users.

10. A photovoltaic coupled high temperature heat pump molten salt energy storage cogeneration system according to claim 1, characterized in that: The photovoltaic coupled high temperature heat pump molten salt energy storage cogeneration system also includes a first circulating water pump and a second circulating water pump; the first circulating water pump is arranged at the end of the condenser, and the second circulating water pump is arranged at the water side outlet of the air preheater.

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