High-temperature heat pump system coupling heat storage and steam supply system

Abstract

The invention provides a high-temperature heat pump system coupling heat storage steam supply system which comprises a high-temperature heat pump system, a hot tank, a cold tank, a medium-temperature phase change material heat storage tank and a steam generator. The high-temperature heat pump system comprises a motor, a compressor, an expansion machine, a first heat exchanger, a second heat exchanger, a heat regenerator and a heat absorber. The low-temperature side of the second heat exchanger and the medium-temperature phase-change material heat storage tank form a phase-change material heat storage cycle; the low-temperature side of the first heat exchanger, the hot tank, the cold tank, the steam generator and the medium-temperature phase change material heat storage tank form a heat storage-heat exchange cycle; or the low-temperature side of the first heat exchanger, the cold tank and the hot tank form high-temperature heat storage, and the hot tank, the cold tank, the steam generator and the medium-temperature phase change material heat storage tank form steam heat exchange circulation. Phase change heat storage and heat storage medium heat storage are combined, multi-stage utilization of sensible heat and latent heat is achieved, and the overall heating efficiency of the high-temperature heat pump system is improved; and meanwhile, the phase-change material is coupled for heat storage, and the use amount of heat storage media is reduced.

Description

Technical Field

[0001] The present invention belongs to the field of energy, and particularly relates to a high-temperature heat pump system coupled with a heat storage and steam supply system. Background Art

[0002] High-temperature heat pump molten salt steam supply is an important exploration path for advanced energy storage methods at the present stage. Its technical route is mainly to generate high temperature through a high-temperature compressor and heat molten salt to achieve heat storage. The basic cycle of the high-temperature heat pump system proposed at present is a simple cycle composed of a compressor, an expander, and a molten salt heat exchanger.

[0003] At present, the cycle is limited by the temperature of the molten salt, resulting in a large amount of molten salt required, low economy, and large floor area. At the same time, the outlet temperature of the compressor is relatively high, making it impossible to improve the heating efficiency of the high-temperature heat pump system. Summary of the Invention

[0004] In view of the above technical problems, the present invention provides a high-temperature heat pump system coupled with a heat storage and steam supply system. The present invention combines phase change heat storage and heat storage medium heat storage to realize multi-stage utilization of sensible heat and latent heat, effectively reduce the inlet temperature of the regenerator, and improve the overall heating efficiency of the high-temperature heat pump system; at the same time, it is coupled with phase change material heat storage to reduce the heat exchange amount of the heat storage medium, thereby reducing the usage amount of the heat storage medium.

[0005] To achieve the above object, the technical solution of the present invention is as follows: A high-temperature heat pump system coupled with a heat storage and steam supply system, comprising: a high-temperature heat pump system and a steam system; The high-temperature heat pump system includes a motor, a compressor, an expander, a first heat exchanger, a second heat exchanger, and a regenerator; the compressor, the motor, and the expander are coaxially arranged. The outlet of the compressor is connected to the high-temperature side inlet of the first heat exchanger. The high-temperature side outlet of the first heat exchanger is connected to the high-temperature side inlet of the second heat exchanger. The high-temperature side outlet of the second heat exchanger is connected to the high-temperature side inlet of the regenerator. The high-temperature side outlet of the regenerator is connected to the inlet of the expander. The outlet of the expander is connected to the low-temperature side inlet of the heat absorber. The low-temperature side outlet of the heat absorber is connected to the low-temperature side inlet of the regenerator. The low-temperature side outlet of the regenerator is connected to the inlet of the compressor; The steam system includes a cold tank, a hot tank, a medium-temperature phase change material (PCM) heat storage tank, and a steam generator. The first outlet of the medium-temperature PCM heat storage tank is connected to the low-temperature side inlet of a second heat exchanger, and the low-temperature side outlet of the second heat exchanger is connected to the first inlet of the medium-temperature PCM heat storage tank. The low-temperature side of the second heat exchanger and the medium-temperature PCM heat storage tank form a PCM heat storage cycle. The low-temperature side outlet of the first heat exchanger is connected to the first inlet of the hot tank, the first outlet of the hot tank is connected to the first inlet of the steam generator, the first outlet of the steam generator is connected to the second inlet of the medium-temperature PCM heat storage tank, and the second outlet of the medium-temperature PCM heat storage tank is connected to the first inlet of the cold tank. The first outlet of the cold tank is connected to the low-temperature side inlet of the first heat exchanger. The low-temperature side of the first heat exchanger, the hot tank, the cold tank, the steam generator, and the medium-temperature PCM heat storage tank form a heat storage-heat exchange cycle. The low-temperature side outlet of the first heat exchanger is connected to the first inlet of the hot tank, the second outlet of the hot tank is connected to the second inlet of the cold tank, and the first outlet of the cold tank is connected to the low-temperature side inlet of the first heat exchanger. The low-temperature side of the first heat exchanger, together with the cold tank and the hot tank, constitutes a high-temperature heat storage system. The first outlet of the hot tank is connected to the first inlet of the steam generator, the first outlet of the steam generator is connected to the second inlet of the medium-temperature phase change material heat storage tank, the second outlet of the medium-temperature phase change material heat storage tank is connected to the first inlet of the cold tank, and the second outlet of the cold tank is connected to the second inlet of the hot tank. The hot tank, the cold tank, the steam generator, and the medium-temperature phase change material heat storage tank constitute a steam heat exchange cycle. An external water supply is connected to the second inlet of the steam generator, and the second outlet of the steam generator is connected to an external steam supply pipeline.

[0006] In a preferred embodiment, an external heat source pipe is connected to the high-temperature side inlet of the absorber, and the high-temperature side outlet of the absorber is connected to an external refrigeration pipe.

[0007] In a preferred embodiment, the system further includes a separator and a preheater. The separator is installed on the connecting pipe between the first outlet of the medium-temperature phase change material storage tank and the low-temperature side inlet of the second heat exchanger. The outlet of the separator is connected to the first pipe and the second pipe. The first pipe is connected to the low-temperature side inlet of the second heat exchanger. The second pipe is connected to the first inlet of the preheater. An external heat source pipe is connected to the second inlet of the preheater. The second outlet of the preheater is connected to the high-temperature side inlet of the absorber. The high-temperature side outlet of the absorber is connected to an external refrigeration pipe.

[0008] In a preferred embodiment, a first circulation pump is installed on the first pipeline.

[0009] In a preferred embodiment, a second circulation pump is installed on the pipeline connecting the first outlet of the cold tank and the low-temperature side inlet of the first heat exchanger.

[0010] In a preferred embodiment, a third circulation pump is installed on the pipe connecting the first outlet of the hot tank and the first inlet of the steam generator.

[0011] In a preferred embodiment, the medium in the hot tank and the cold tank is molten salt.

[0012] In a preferred embodiment, the intermediate-temperature phase change material is a pyrazole phase change material or a polyethylene glycol composite phase change material.

[0013] In a preferred embodiment, the working fluid of the high-temperature heat pump system is air.

[0014] Because of the above technical solutions, this invention has the following advantages and positive effects compared with the prior art: The high-temperature heat pump system coupled with a heat storage and steam supply system provided by this invention includes a high-temperature heat pump system and a steam system. On the high-temperature heat pump side: the compressor outlet of the high-temperature heat pump is sequentially connected to a first heat exchanger and a second heat exchanger. The first heat exchanger is used to reduce the heat of the gaseous working fluid of the high-temperature heat pump and exchange heat with the medium in the hot and cold tanks to store high-temperature heat. The second heat exchanger is used to further reduce the heat of the gaseous working fluid of the high-temperature heat pump and exchange heat with the intermediate-temperature phase change material, so that the intermediate-temperature phase change material changes from solid to liquid, storing the intermediate-temperature heat, thereby reducing the temperature of the gaseous working fluid entering the regenerator. On the steam system side: due to the heat storage-heat exchange cycle or the steam heat exchange cycle, the heat exchange medium flowing out of the first outlet of the steam generator first passes through the liquid intermediate-temperature phase change material, absorbs the latent heat of the intermediate-temperature phase change material, and increases the temperature. Then it enters the cold and hot tanks, absorbs the sensible heat of the medium in the cold and hot tanks, and then enters the steam generator to exchange heat with the external feed water, so that the second outlet of the steam generator outputs steam. Therefore, this invention realizes multi-stage utilization of sensible heat and latent heat, more effectively reduces the inlet temperature of the regenerator, and thus improves the heating efficiency of the high-temperature heat pump system.

[0015] Meanwhile, the use of medium-temperature phase change material for heat exchange reduces the amount of heat exchanged between the gaseous working fluid and the heat storage medium in existing technologies, thereby reducing the amount of heat storage medium used and its cost. Attached Figure Description

[0016] Figure 1 This is one of the high-temperature heat pump systems coupled with a heat storage and steam supply system according to embodiments of the present invention; Figure 2 This is the second embodiment of the high-temperature heat pump system coupled with a heat storage and steam supply system according to the present invention. Reference numerals: 1-Expander; 2-Compressor; 3-Electric motor; 4-Regenerator; 5-Absorber; 6-First heat exchanger; 7-Second heat exchanger; 8-Hot tank; 9-Cold tank; 10-Medium-temperature phase change material storage tank; 11-First circulating pump; 12-Third circulating pump; 13-Steam generator; 14-Separator; 15-Preheater; 16-First pipeline; 17-Second pipeline; 18-Second circulating pump. Detailed Implementation

[0017] The following detailed description, in conjunction with the accompanying drawings and specific embodiments, provides a high-temperature heat pump system coupled with a thermal storage and steam supply system based on the present invention. The advantages and features of the present invention will become clearer from the following description.

[0018] Example 1 In this embodiment, the high-temperature side is the side in the heat exchanger where the medium releases heat, and the low-temperature side is the side in the heat exchanger where the medium absorbs heat. The medium temperature of the medium-temperature phase change material is relative to the high-temperature heat storage medium in the heat tank, and is usually in the temperature range of 100-250°C.

[0019] A high-temperature heat pump system coupled with a thermal storage and steam supply system, such as Figure 1 As shown, it includes: a high-temperature heat pump system, a hot tank 8, a cold tank 9, a medium-temperature phase change material heat storage tank 10, and a steam generator 13; The high-temperature heat pump system includes an electric motor 3, a compressor 2, an expander 1, a first heat exchanger 6, a second heat exchanger 7, and a regenerator 4. The compressor 2, the electric motor 3, and the expander 1 are arranged coaxially. The outlet of the compressor 2 is connected to the high-temperature side inlet of the first heat exchanger 6. The high-temperature side outlet of the first heat exchanger 6 is connected to the high-temperature side inlet of the second heat exchanger 7. The high-temperature side outlet of the second heat exchanger 7 is connected to the high-temperature side inlet of the regenerator 4. The high-temperature side outlet of the regenerator 4 is connected to the inlet of the expander 1. The outlet of the expander 1 is connected to the low-temperature side inlet of the absorber 5. The low-temperature side outlet of the absorber 5 is connected to the low-temperature side inlet of the regenerator 4. The low-temperature side outlet of the regenerator 4 is connected to the inlet of the compressor 2. The first outlet of the medium-temperature phase change material heat storage tank 10 is connected to the low-temperature side inlet of the second heat exchanger 7. The low-temperature side outlet of the second heat exchanger 7 is connected to the first inlet of the medium-temperature phase change material heat storage tank 10. The low-temperature side of the second heat exchanger 7 and the medium-temperature phase change material heat storage tank 10 form a phase change material heat storage cycle. The low-temperature side outlet of the first heat exchanger 6 is connected to the first inlet of the hot tank 8. The first outlet of the hot tank 8 is connected to the first inlet of the steam generator 13. The first outlet of the steam generator 13 is connected to the second inlet of the medium-temperature phase change material heat storage tank 10. The second outlet of the medium-temperature phase change material heat storage tank 10 is connected to the first inlet of the cold tank 9. The first outlet of the cold tank 9 is connected to the low-temperature side inlet of the first heat exchanger 6. The low-temperature side of the first heat exchanger 6, the hot tank 8, the cold tank 9, the steam generator 13, and the medium-temperature phase change material heat storage tank 10 form a heat storage-heat exchange cycle. The external water supply is connected to the second inlet of the steam generator 13, and the second outlet of the steam generator 13 is connected to the external steam supply pipeline.

[0020] In this embodiment, the working fluid in the high-temperature heat pump system is compressed into a high-temperature, high-pressure gas by the compressor 2. The high-temperature, high-pressure gas flows out from the outlet of the compressor 2 and into the high-temperature side of the first heat exchanger 6 to release heat. After cooling, the high-temperature, high-pressure gas enters the high-temperature side of the second heat exchanger 7 and releases heat again to lower the temperature, becoming a medium-high-temperature, high-pressure gas. It then flows out from the high-temperature side outlet of the second heat exchanger 7 and flows into the high-temperature side of the regenerator 4 to further release heat, becoming a medium-low-temperature, high-pressure gas. The medium-low-temperature, high-pressure gas enters the expander 1 and expands into a low-temperature, low-pressure gas. The low-temperature, low-pressure gas enters the low-temperature side of the absorber 5 to absorb heat. After absorbing heat in the low-temperature side of the regenerator 4, it enters the compressor 2 again to complete the next cycle.

[0021] In the phase change material thermal storage cycle, the first heat exchange medium flows into the low-temperature side of the second heat exchanger 7 to absorb the heat from the high-temperature and high-pressure gas in the high-temperature side of the second heat exchanger 7. After being heated, the first heat exchange medium flows out from the low-temperature side of the second heat exchanger 7 and flows into the medium-temperature phase change material thermal storage tank 10. The medium-temperature phase change material absorbs the heat from the first heat exchange medium and changes from solid to liquid. Meanwhile, the first heat exchange medium releases heat and lowers its temperature, and then flows out from the medium-temperature phase change material thermal storage tank 10 and returns to the low-temperature side of the second heat exchanger 7 to absorb heat again.

[0022] In the heat storage-heat exchange cycle, a heat storage medium, such as molten salt, is used as the second heat exchange medium. Since the low-temperature side of the first heat exchanger 6 is connected to the cold tank 9 and the hot tank 8, the low-temperature heat storage medium in the cold tank 9 flows into the low-temperature side of the first heat exchanger 6 to absorb the heat released by the high-temperature and high-pressure gas and raise its temperature. The heated high-temperature heat storage medium flows into the hot tank 8 to store heat. Then, the high-temperature heat storage medium stored in the hot tank 8 flows into the steam generator 13 to exchange heat with water. The cooled low-temperature heat storage medium flows out of the steam generator 13 and then flows into the medium-temperature phase change material heat storage tank 10 to absorb the latent heat of the medium-temperature phase change material and raise its temperature. The medium-temperature phase change material changes from liquid to solid. The heated heat storage medium flows out of the medium-temperature phase change material heat storage tank 10 and flows into the cold tank 9 to mix with the heat storage medium in the cold tank 9 and raise its temperature. Then it enters the low-temperature side of the first heat exchanger 6 to absorb heat. The heated high-temperature heat storage medium then flows into the steam generator 13 to exchange heat and realize high-temperature steam.

[0023] This embodiment couples a high-temperature heat pump, molten salt thermal storage, and steam supply into a single system, and also integrates intermediate-temperature phase change material (PCM) thermal storage. For the high-temperature heat pump system, heat is first exchanged and stored through a first heat exchanger 6 with a high-temperature thermal storage system such as molten salt. Then, heat is further exchanged through a second heat exchanger 7 using a first heat exchange medium with the intermediate-temperature PCM, causing the PCM to undergo phase change and store heat. This achieves multi-stage heat utilization and reduces the inlet temperature of the regenerator 4. Simultaneously, the use of a thermal storage medium such as molten salt for heat exchange with the gas in the high-temperature heat pump system represents the utilization of the sensible heat of the molten salt, and the phase change material... Heat exchange with gas is a utilization of the sensible heat of phase change materials. On the steam side, the second heat exchange medium flowing out from the first outlet of the steam generator 13 first passes through the liquid medium-temperature phase change material, absorbs the latent heat of the medium-temperature phase change material, and increases the temperature. Then it enters the cold tank 9, the high-temperature side of the first heat exchanger 6, and the hot tank 8, where it absorbs the gas heat from the high-temperature side of the first heat exchanger 6. Then it enters the steam generator 13 and exchanges heat with the external feed water, so that the second outlet of the steam generator 13 outputs steam. This realizes the multi-stage utilization of sensible and latent heat, more effectively reduces the inlet temperature of the regenerator 4, and thus improves the heating efficiency of the high-temperature heat pump system.

[0024] Coupled with phase change material thermal storage, the heat exchange between the gas and the thermal storage medium such as molten salt is reduced, thereby reducing the amount of molten salt used and reducing the cost of molten salt.

[0025] In this embodiment, the system can also respond to the off-peak electricity policy. During off-peak or curtailed electricity periods, the high-temperature heat pump system operates to convert electrical energy into heat energy and store it in the heat tank 8 and the medium-temperature phase change material heat storage tank 10. At the same time, steam is supplied for heating, power generation, etc. During peak electricity consumption periods, the high-temperature heat pump system does not operate. The high-temperature heat storage medium stored in the heat tank 8 enters the steam generator 13 to generate steam, which can be used for subsequent power generation or heating.

[0026] In a preferred embodiment, this embodiment further includes providing cooling to the outside world. An external heat source pipe is connected to the high-temperature side inlet of the absorber 5, and the high-temperature side outlet of the absorber 5 is connected to an external cooling pipe. The absorber absorbs heat from an external heat source, such as industrial waste heat, or a working fluid at room temperature. The heat is released into the high-temperature side of the absorber 5, and after the temperature is reduced, it enters the external cooling pipe for cooling.

[0027] Furthermore, the waste heat in this system can be used to preheat external heat sources. The system also includes a separator 14 and a separator 14 installed on the pipeline connecting the first outlet of the medium-temperature phase change material storage tank 10 and the low-temperature side inlet of the second heat exchanger 7 to the preheater 15. The outlet of the separator 14 is connected to the first pipeline 16 and the second pipeline 17. The first pipeline 16 is connected to the low-temperature side inlet of the second heat exchanger 7, and the second pipeline 17 is connected to the first inlet of the preheater 15. The external heat source pipeline is connected to the second inlet of the preheater 15. The second outlet of the preheater 15 is connected to the high-temperature side inlet of the absorber 5, and the high-temperature side outlet of the absorber 5 is connected to the external refrigeration pipeline.

[0028] In the circulation pipe connecting the medium-temperature phase change material storage tank 10 and the second heat exchanger 7, the heat in the high-temperature heat pump system is transferred to the second heat exchanger 7 by circulating the second heat exchange medium. The second heat exchange medium enters the medium-temperature phase change material storage tank 10 for heat exchange, while the unused part of the heat from the medium-temperature phase change material enters the preheater 15 through the separator 14, effectively realizing the utilization of waste heat.

[0029] Preferably, a first circulation pump 11 is provided on the first pipeline 16 to assist the second heat exchange medium in circulating in the circulation pipeline connecting the intermediate temperature phase change material heat storage tank 10 and the second heat exchanger 7.

[0030] Preferably, a second circulation pump 18 is installed on the pipeline connecting the first outlet of the cold tank 9 and the low-temperature side inlet of the first heat exchanger 6 to assist in the circulation of the second heat exchange medium.

[0031] Preferably, a third circulation pump 12 is installed on the pipe connecting the first outlet of the hot tank 8 and the first inlet of the steam generator 13.

[0032] Preferably, the medium-temperature phase change material is a phase change material with a temperature of 100-250°C, such as a pyrazole phase change material with a melting point of about 168°C or a polyethylene glycol composite phase change material with a melting point of about 140°C.

[0033] Taking air as the circulating medium and molten salt as the second heat exchange medium in a high-temperature heat pump system as an example, the circulation process of the above embodiment is illustrated: When the high-temperature heat pump system is working: the low-temperature air flowing out of the expander 1 flows into the low-temperature side of the absorber 5 to absorb heat, raising the air temperature to 50°C and entering the low-temperature side of the regenerator 4. After absorbing heat through the regenerator 4, the air temperature rises to 140°C and flows into the compressor 2. After the compressor 2, the air temperature rises to 400°C and enters the high-temperature side of the first heat exchanger 6. After heat exchange, the air temperature drops to 190°C and enters the high-temperature side of the second heat exchanger 7. After further heat exchange, the air temperature drops to 150°C and enters the high-temperature side of the regenerator 4. After the regenerator 4, the air temperature drops to 60°C and enters the expander 1. After cooling and depressurization, the air enters the absorber 5, completing the cycle. In the phase change material (PCM) thermal storage cycle: the first heat exchange medium enters the low-temperature side of the second heat exchanger 7 to absorb heat. After being heated, the first heat exchange medium enters the medium-temperature PCM thermal storage tank 10, where it exchanges heat with the medium-temperature PCM. The medium-temperature PCM changes from solid to liquid, storing heat. After heat exchange and cooling, the first heat exchange medium enters the separator 14. Most (80%) of the first heat exchange medium is pumped into the second heat exchanger 7 by the first circulation pump 11. The other part of the first heat exchange medium enters the preheater 15 to heat the external waste heat medium (e.g., room temperature gas working fluid), enters the high-temperature side of the absorber 5, releases heat, cools the outside environment, and increases the heat source temperature of the high-temperature side of the absorber 5, effectively realizing the utilization of waste heat.

[0034] The low-temperature molten salt flowing out of the steam generator 13 enters the medium-temperature phase change material storage tank 10, absorbs the heat of the medium-temperature phase change material, and the medium-temperature phase change material changes from liquid to solid. The low-temperature molten salt increases in temperature and then enters the cold tank 9 to mix with the molten salt in the cold tank 9 and heats up again. It enters the low-temperature side of the first heat exchanger 6, absorbs heat and increases in temperature, and flows into the hot tank. The high-temperature heat storage medium can be stored in the hot tank 8 or enter the steam generator 13 for heat exchange, so that the water on the other side of the steam generator 13 absorbs heat and outputs steam.

[0035] During off-peak electricity periods, a high-temperature heat pump system is used to convert electrical energy into molten salt thermal energy and medium-temperature phase change material thermal energy for storage, while also providing steam.

[0036] During peak electricity consumption periods, the high-temperature heat pump system can be shut down. It utilizes the thermal energy stored in molten salt and the thermal energy stored in medium-temperature phase change materials to convert into steam. Specifically, external water enters the steam generator 13 and exchanges heat with the molten salt on the other side of the steam generator 13 to generate high-temperature steam, which can be used for subsequent power generation.

[0037] Simulation calculations using simulation software show that the COP of the high-temperature heat pump system coupled with phase change material in this specific embodiment can reach 1.39, which is an effective improvement compared to the original high-temperature heat pump system + molten salt heat exchanger (COP is 1.24). The medium-temperature phase change material heat storage tank 10 undertakes part of the heat storage function, reducing the heat storage capacity of molten salt heat storage, and effectively reducing the floor space of the hot tank 8 and cold tank 9 by 20%.

[0038] Example 2 like Figure 2As shown, in this embodiment, the second outlet of the hot tank 8 is connected to the second inlet of the cold tank 9, and the second outlet of the cold tank 9 is connected to the second inlet of the hot tank 8. The rest of the system structure is the same as in Embodiment 1, and it has the same effects. The difference between this embodiment and Embodiment 1 is that the heat storage-heat exchange cycle of Embodiment 1 is divided into a heat storage cycle and a steam heat exchange cycle. In the thermal storage cycle, molten salt is used as the second heat exchange medium. The molten salt in the cold tank 9 is lifted by the second circulation pump 18 and enters the low-temperature side of the first heat exchanger 6 to absorb heat. The heated molten salt enters the hot tank 8. The high-temperature molten salt in the hot tank 8 exchanges heat with the third heat exchange medium and then cools down. The cooled molten salt enters the cold tank 9, completing the thermal storage cycle. In the steam heat exchange cycle: the third heat exchange medium (e.g., water) flows out from the first outlet of the steam generator 13 and enters the medium-temperature phase change material thermal storage tank 10 to absorb the heat of the medium-temperature phase change material. The heated third heat exchange medium enters the cold tank 9 to absorb the heat of the molten salt in the cold tank 9, and then flows into the hot tank 8 to absorb the heat of the high-temperature molten salt. The heated third heat exchange medium is lifted by the third circulation pump 12 and enters the steam generator for heat exchange. The cooled third heat exchange medium flows out from the steam generator 13 and enters the next cycle. External feedwater enters the steam generator 13 to absorb the heat of the third heat exchange medium on the other side and heats up to become high-temperature steam.

[0039] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they shall still fall within the protection scope of the present invention.

Claims

1. A high-temperature heat pump system coupled with a thermal storage and steam supply system, characterized in that, include: High-temperature heat pump systems and steam systems; The high-temperature heat pump system includes an electric motor, a compressor, an expander, a first heat exchanger, a second heat exchanger, a regenerator, and a receiver. The compressor, electric motor, and expander are arranged coaxially. The outlet of the compressor is connected to the high-temperature side inlet of the first heat exchanger. The high-temperature side outlet of the first heat exchanger is connected to the high-temperature side inlet of the second heat exchanger. The high-temperature side outlet of the second heat exchanger is connected to the high-temperature side inlet of the regenerator. The high-temperature side outlet of the regenerator is connected to the inlet of the expander. The outlet of the expander is connected to the low-temperature side inlet of the receiver. The low-temperature side outlet of the receiver is connected to the low-temperature side inlet of the regenerator. The low-temperature side outlet of the regenerator is connected to the inlet of the compressor. The steam system includes a cold tank, a hot tank, a medium-temperature phase change material (PCM) heat storage tank, and a steam generator. The first outlet of the medium-temperature PCM heat storage tank is connected to the low-temperature inlet of a second heat exchanger. The low-temperature outlet of the second heat exchanger is connected to the first inlet of the medium-temperature PCM heat storage tank. The low-temperature side of the second heat exchanger and the medium-temperature PCM heat storage tank form a PCM heat storage cycle. The low-temperature outlet of the first heat exchanger is connected to the first inlet of the hot tank. The first outlet of the hot tank is connected to the first inlet of the steam generator. The first outlet of the steam generator is connected to the second inlet of the medium-temperature PCM heat storage tank. The second outlet of the medium-temperature PCM heat storage tank is connected to the first inlet of the cold tank. The first outlet of the cold tank is connected to the low-temperature inlet of the first heat exchanger. The low-temperature side of the first heat exchanger, the hot tank, the cold tank, the steam generator, and the medium-temperature PCM heat storage tank form a heat storage-heat exchange cycle. The low-temperature side outlet of the first heat exchanger is connected to the first inlet of the hot tank, the second outlet of the hot tank is connected to the second inlet of the cold tank, and the first outlet of the cold tank is connected to the low-temperature side inlet of the first heat exchanger. The low-temperature side of the first heat exchanger, together with the cold tank and the hot tank, forms a high-temperature heat storage cycle. The first outlet of the hot tank is connected to the first inlet of the steam generator, the first outlet of the steam generator is connected to the second inlet of the medium-temperature phase change material heat storage tank, the second outlet of the medium-temperature phase change material heat storage tank is connected to the first inlet of the cold tank, and the second outlet of the cold tank is connected to the second inlet of the hot tank. The hot tank, the cold tank, the steam generator, and the medium-temperature phase change material heat storage tank form a steam heat exchange cycle. An external water supply is connected to the second inlet of the steam generator, and the second outlet of the steam generator is connected to an external steam supply pipeline.

2. The high-temperature heat pump system coupled with a thermal storage and steam supply system according to claim 1, characterized in that, An external heat source pipe is connected to the high-temperature side inlet of the absorber, and the high-temperature side outlet of the absorber is connected to an external refrigeration pipe.

3. The high-temperature heat pump system coupled with a thermal storage and steam supply system according to claim 2, characterized in that, It also includes a separator and a preheater. A separator is installed on the connecting pipe between the first outlet of the medium-temperature phase change material storage tank and the low-temperature side inlet of the second heat exchanger. The outlet of the separator is connected to the first pipe and the second pipe. The first pipe is connected to the low-temperature side inlet of the second heat exchanger. The second pipe is connected to the first inlet of the preheater. An external heat source pipe is connected to the second inlet of the preheater. The second outlet of the preheater is connected to the high-temperature side inlet of the absorber. The high-temperature side outlet of the absorber is connected to the external refrigeration pipe.

4. The high-temperature heat pump system coupled with a thermal storage and steam supply system according to claim 3, characterized in that, A first circulation pump is installed on the first pipeline.

5. The high-temperature heat pump system coupled with a thermal storage and steam supply system according to claim 1, characterized in that, A second circulation pump is installed on the pipeline connecting the first outlet of the cold tank and the low-temperature side inlet of the first heat exchanger.

6. The high-temperature heat pump system coupled with a thermal storage and steam supply system according to claim 1, characterized in that, A third circulation pump is installed on the pipeline connecting the first outlet of the hot tank and the first inlet of the steam generator.

7. The high-temperature heat pump system coupled with a thermal storage and steam supply system according to claim 1, characterized in that, The medium in the cold tank and the hot tank is molten salt or solid heat storage medium.

8. The high-temperature heat pump system coupled with a thermal storage and steam supply system according to claim 1, characterized in that, The intermediate-temperature phase change material is a pyrazole phase change material or a polyethylene glycol composite phase change material.

9. The high-temperature heat pump system coupled with a thermal storage and steam supply system according to claim 1, characterized in that, The working fluid of the high-temperature heat pump system is air.

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