Heat pump electricity storage system based on heat return and cold return and operation method of heat pump electricity storage system

Abstract

The heat pump electricity storage system comprises a heat pump loop, a high-temperature heat storage module, a low-temperature cold storage module and an electricity generation module, and the heat pump loop comprises a first compressor, a second compressor, a heat pump regenerator, a first heat exchanger, a heat pump recooler and a second heat exchanger; the first compressor, the cold side of the heat pump regenerator, the second compressor, the first heat exchanger, the hot side of the heat pump regenerator, the fourth heat exchanger, the hot side of the heat pump recooler, the first expansion machine, the second heat exchanger and the cold side of the heat pump recooler are sequentially connected through pipelines to form a loop, and the first heat exchanger is used for exchanging heat with the high-temperature heat storage module. The second heat exchanger is used for exchanging heat with the low-temperature cold storage module; according to the heat pump heat regenerator and the heat pump cold regenerator, waste heat and waste cold generated after heat exchange of a working medium and a heat storage / cold medium can be recycled correspondingly, through the two-stage compression intermediate heating and heat regeneration and cold regeneration design, the pressure ratio and the temperature ratio are reduced, the development difficulty of thermal machinery is lowered, and meanwhile the electricity-heat conversion performance of the heat pump is improved.

Description

Technical Field

[0001] The present invention relates to the field of energy storage technology, and in particular to a heat pump power storage system based on heat recovery and cooling and an operation method thereof. Background Art

[0002] In recent years, with the continuous growth of installed capacity and power generation of renewable energy such as solar and wind power, the phenomenon of wind and solar power abandonment has become serious. Large energy bases of wind power and photovoltaic and solar thermal power need greater flexibility to ensure that the volatile and uncertain wind and solar power can be reliably integrated into the power system. Therefore, it has become necessary to equip them with energy storage.

[0003] At present, large wind power and photovoltaic and solar thermal energy bases are generally located in deserts and Gobi. Electrochemical energy storage represented by lithium battery energy storage has high cost and poor thermal safety. At the same time, its geographical location and harsh environment make maintenance difficult and its life span short. Heat pump energy storage has received extensive attention in recent years because it is not restricted by geographical conditions, has large energy storage capacity, and has a long energy storage time.

[0004] Heat pump electricity storage mainly includes three processes: the charging process converts the input off-peak electricity or surplus electricity (such as photovoltaic power) into high-temperature heat energy and low-temperature cold energy through the heat pump; the storage of high-temperature heat energy and low-temperature cold energy; the discharge process converts high-temperature heat energy and low-temperature cold energy into electrical energy output through a heat engine to alleviate the pressure on the power grid during peak power consumption.

[0005] In current technology, on the one hand, achieving high-temperature heat storage and low-temperature cold storage at the same time requires the heat pump to achieve a large temperature difference, resulting in poor heat pump performance and high requirements for the compressor. On the other hand, the irreversibility of the cycle process will require the use of additional heat exchangers to discharge a large amount of heat to the environment in order to match the cycle with the heat / cold storage temperature, which causes waste. Summary of the invention

[0006] In view of the defects in the prior art, an object of the present invention is to provide a heat pump power storage system based on heat recovery and cooling and an operation method thereof.

[0007] The heat pump power storage system based on heat recovery and cooling provided by the present invention comprises a heat pump circuit, a high-temperature heat storage module, a low-temperature cold storage module and a power generation module, wherein the high-temperature heat storage module and the low-temperature cold storage module are both connected to the heat pump circuit by heat exchange, and the power generation module is connected to the high-temperature heat storage module by heat exchange;

[0008] The heat pump circuit and the power generation module are both connected to the external power grid, the power generation module is used to supply power to the external power grid, the heat pump circuit is driven by the power to be consumed, and is used to absorb heat from the low-temperature cold storage module and release heat to the high-temperature heat storage module, wherein the low-temperature cold storage module is used to store low-temperature cold energy, and the high-temperature heat storage module is used to store high-temperature heat energy;

[0009] The heat pump circuit includes a first compressor, a second compressor, a heat pump regenerator, a first heat exchanger, a fourth heat exchanger, a heat pump regenerator, a first expander and a second heat exchanger;

[0010] The first compressor, the cold side of the heat pump regenerator, the second compressor, the first heat exchanger, the hot side of the heat pump regenerator, the fourth heat exchanger, the hot side of the heat pump regenerator, the first expander, the second heat exchanger and the cold side of the heat pump regenerator are sequentially connected through pipelines to form a loop;

[0011] The first heat exchanger is used for heat exchange with the high-temperature heat storage module, and the second heat exchanger is used for heat exchange with the low-temperature cold storage module.

[0012] Preferably, the heat pump circuit further comprises an external heating device;

[0013] The cold side inlet of the heat pump regenerator is connected to the outlet of the first compressor, the cold side outlet of the heat pump regenerator is connected to the inlet of the external heating device, and the hot side inlet of the heat pump regenerator is connected to the working medium outlet of the first heat exchanger;

[0014] The hot side outlet of the heat pump regenerator is connected to the fourth heat exchanger, and the fourth heat exchanger is used to output waste heat for heating, and the hot side inlet of the heat pump regenerator is connected to the fourth heat exchanger;

[0015] The hot side outlet of the heat pump recooler is connected to the inlet of the first expander, the outlet of the first expander is connected to the working medium inlet of the second heat exchanger heat pump, the cold side inlet of the heat pump recooler is connected to the working medium outlet of the second heat exchanger heat pump, and the cold side outlet of the heat pump recooler is connected to the inlet of the first compressor;

[0016] The first compressor and the second compressor are both connected to an external power grid and driven by the power to be consumed.

[0017] Preferably, the high-temperature heat storage module comprises a high-temperature heat storage tank, a third heat exchanger, a low-temperature heat storage tank and a first heat exchanger which are sequentially connected by pipelines to form a loop;

[0018] The heat storage medium inlet of the first heat exchanger is connected to a low-temperature heat storage tank, the heat storage medium outlet of the first heat exchanger is connected to a high-temperature heat storage tank, the heat storage medium inlet of the third heat exchanger is connected to a high-temperature heat storage tank, and the heat storage medium outlet of the third heat exchanger is connected to the low-temperature heat storage tank;

[0019] The first heat exchanger is used as a common component between the high-temperature heat storage module and the heat pump circuit, and is used for heat exchange between the high-temperature heat storage module and the heat pump circuit. The third heat exchanger is used as a common component between the high-temperature heat storage module and the power generation module, and is used for heat exchange between the high-temperature heat storage module and the power generation module.

[0020] Preferably, the heat storage medium of the high-temperature heat storage module is molten salt.

[0021] Preferably, the low-temperature cold storage module comprises a gas storage tank, a second heat exchanger and a liquid storage tank, and the gas storage tank, the second heat exchanger and the liquid storage tank are connected in sequence through pipelines;

[0022] The second heat exchanger is a common component of the low-temperature cold storage module and the heat pump circuit, and is used for heat exchange between the low-temperature cold storage module and the heat pump circuit.

[0023] Preferably, the working fluid of the heat pump circuit is one of air, argon, nitrogen, helium, carbon dioxide, etc., and the cold storage medium of the low-temperature cold storage module is one or more of methanol, ethanol, propane, pentane, hydrogen, ammonia, nitrogen, oxygen, natural gas, etc.

[0024] Preferably, the power generation module comprises a third heat exchanger, a second expander, a heat engine regenerator, a fifth heat exchanger and a third compressor which are sequentially connected through pipelines, and the fifth heat exchanger is used to output waste heat for heat supply;

[0025] The power generation working medium outlet of the third heat exchanger is connected to the inlet of the second expander, the hot side inlet of the heat engine regenerator is connected to the outlet of the second expander, the hot side outlet of the heat engine regenerator is connected to the fifth heat exchanger, the cold side inlet of the heat engine regenerator is connected to the outlet of the third compressor, and the cold side outlet of the heat engine regenerator is connected to the power generation working medium inlet of the third heat exchanger;

[0026] The second expander is connected to a power generation device and is used to drive the power generation device to generate electricity. The power generation device is connected to an external power grid.

[0027] Preferably, the working fluid of the power generation module is one or more including but not limited to carbon dioxide, water vapor, air, argon, etc.

[0028] According to the operating method of the heat pump power storage system based on heat recovery and cooling provided by the present invention, the heat pump power storage system based on heat recovery and cooling is adopted, and the following steps are included:

[0029] Charging step: Electricity is consumed to drive the first compressor and the second compressor to operate. The heat pump working fluid is compressed by the first compressor and enters the heat pump regenerator to absorb heat, and then is heated in an external heating device, and then pressurized by the second compressor to form high-temperature and high-pressure gas;

[0030] The high-temperature and high-pressure gas enters the first heat exchanger to exchange heat with the high-temperature heat storage module, then enters the heat pump regenerator again to release heat, then enters the fourth heat exchanger and the heat pump regenerator to be cooled, then enters the first expander to perform work and become low-temperature and low-pressure gas, the low-temperature and low-pressure gas enters the second heat exchanger to exchange heat with the low-temperature heat storage module, and returns to the first compressor inlet after absorbing heat from the heat pump regenerator;

[0031] Discharging steps: the high-temperature and high-pressure working fluid leaving the outlet of the third heat exchanger enters the second expander to perform work and drive the power generation device to generate electricity, and then releases heat in the heat engine regenerator and the fifth heat exchanger to become a low-temperature and low-pressure state. The low-temperature and low-pressure working fluid is compressed by the third compressor and enters the heat engine regenerator for preheating, and then absorbs the heat stored in the high-temperature heat storage module in the third heat exchanger to return to a high-temperature and high-pressure state.

[0032] Preferably, in the charging step, the gas after heat exchange in the first heat exchanger enters the heat pump regenerator to release heat, and after heat release, the residual heat is output through the fourth heat exchanger for heating, and then enters the heat pump regenerator to be cooled;

[0033] In the discharge step, the working fluid after releasing heat in the heat engine regenerator enters the fifth heat exchanger to transfer heat to the heat user, and becomes a low-temperature and low-pressure state.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] 1. The present invention adopts a heat pump cycle of heat recovery-cooling recovery-work recovery. The heat pump regenerator can recover the waste heat after the working fluid leaves the first heat exchanger, the heat pump cooler can recover the waste cold after the working fluid leaves the second heat exchanger, and the expander can recover a part of the expansion work. Through the two-stage compression intermediate heating and heat recovery and cooling design, the pressure ratio and temperature ratio are reduced, the difficulty of thermal machinery development is reduced, and the heat pump electric-heat conversion performance is improved.

[0036] 2. The present invention decouples heat storage from cold storage, which can avoid energy waste or efficiency sacrifice caused by matching heat storage temperature and cold storage temperature during discharge. The high-temperature heat storage end can directly carry the existing solar thermal power station heat storage, with low comprehensive cost; the low-temperature cold storage end can fully utilize cold energy for the needs of chemical gas liquefaction and deep cold separation technology.

[0037] 3. The present invention can generate high-temperature steam or hot water during both charging and discharging processes to meet the thermal needs of regional heating and industrial and agricultural needs.

[0038] 4. The present invention proposes a heat pump power storage system based on a new type of heat recovery-cooling recovery-work recovery. In large energy bases, compared with direct electric heating heat storage and energy storage methods, the existing solar thermal collectors and heat pumps in solar thermal power stations can achieve an electric-thermal amplification effect, further improving the electric-electric conversion efficiency.

[0039] 5. The present invention has two major application scenarios. On the one hand, it can be coupled with renewable energy storage to be used for solar photovoltaic or wind power consumption to improve the stability of the power system. On the other hand, it can be used for the transformation of retired thermal power plants, replacing the boilers of old coal-fired units, and building independent energy storage power stations to play a peak-shaving role and provide support for the construction of a high-proportion new power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0041] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0042] Figure 2 It is a charging flow chart of the present invention;

[0043] Figure 3 It is the discharge flow chart of the present invention.

[0044] The figure shows:

[0045] First compressor 1 Third heat exchanger 11

[0046] Heat pump regenerator 2 Power generation device 12

[0047] Second compressor 3 gas storage tank 13

[0048] First heat exchanger 4 Liquid storage tank 14

[0049] Fourth heat exchanger 5 External heating device 15

[0050] Heat pump recooler 6 Second expansion machine 16

[0051] First expansion machine 7 Heat engine regenerator 17

[0052] Second heat exchanger 8 Fifth heat exchanger 18

[0053] High temperature heat storage tank 9 Third compressor 19

[0054] Low temperature heat storage tank 10 DETAILED DESCRIPTION

[0055] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0056] The present invention discloses a heat pump power storage system based on heat recovery and cooling and an operation method thereof. The waste heat of the working fluid can be recovered by the heat pump regenerator, and the waste cold of the working fluid can be recovered by the heat pump regenerator. Through the two-stage compression intermediate heating and heat recovery and cooling design, the pressure ratio and temperature ratio are reduced, the difficulty of thermal machinery development is reduced, and the heat pump electric-heat conversion performance is improved.

[0057] Example 1

[0058] This embodiment provides a heat pump power storage system based on a novel heat recovery-cooling recovery-work recovery, such as Figure 1 As shown, it includes a heat pump circuit, a high-temperature heat storage module, a low-temperature cold storage module and a power generation module, wherein the high-temperature heat storage module and the low-temperature cold storage module are both connected to the heat pump circuit for heat exchange, and the power generation module is connected to the high-temperature heat storage module for heat exchange; the heat pump circuit and the power generation module are both connected to an external power grid, the power generation module is used to supply power to the external power grid, the heat pump circuit is driven by the power to be consumed, and is used to absorb heat from the low-temperature cold storage module and release heat to the high-temperature heat storage module, wherein the low-temperature cold storage module is used to store low-temperature cold energy, and the high-temperature heat storage module is used to store high-temperature heat energy;

[0059] The system is conducive to reducing the compressor pressure ratio and temperature ratio, improving the performance of the heat pump; at the same time, it decouples cold storage from heat storage to avoid energy waste caused by temperature mismatch. The heat pump circuit is driven by the electricity that needs to be absorbed, absorbs heat from the low-temperature cold storage module, releases heat to the high-temperature heat storage module, stores low-temperature cold energy in the low-temperature cold storage module, and stores high-temperature heat energy in the high-temperature heat storage module; during peak electricity consumption, the high-temperature heat energy stored in the high-temperature heat storage module can drive the power generation module to supply electricity to the power grid; low-temperature cold energy is used in the low-temperature cold storage module to produce liquid fuel or other chemical gas liquefaction needs and deep cold separation technology.

[0060] The heat pump circuit is connected in sequence by a first compressor 1, a heat pump regenerator 2, an external heating device 15, a second compressor 3, a first heat exchanger 4, a fourth heat exchanger 5, a heat pump regenerator 6, an expander 7, and a second heat exchanger 8 through pipelines. Preferably, the working medium flowing through the heat pump circuit is air. The cold side inlet of the heat pump regenerator 2 is connected to the outlet of the first compressor 1, the cold side outlet of the heat pump regenerator 2 is connected to the inlet of the external heating device 15, the hot side inlet of the heat pump regenerator 2 is connected to the air outlet of the first heat exchanger 4, and the hot side outlet of the heat pump regenerator 2 is connected to the fourth heat exchanger 5; the hot side inlet of the heat pump regenerator 6 is connected to the fourth heat exchanger 5, the hot side outlet of the heat pump regenerator 6 is connected to the inlet of the expander 7, the cold side inlet of the heat pump regenerator 6 is connected to the air outlet of the second heat exchanger 8, and the cold side outlet of the heat pump regenerator 6 is connected to the inlet of the first compressor 1.

[0061] Optionally, the heat pump circuit circulation medium is one of air, argon, nitrogen, helium, carbon dioxide, etc. Preferably, the external heating device 15 installed between the cold side outlet of the heat pump regenerator 2 and the inlet of the second compressor 3 is a solar thermal power station solar collector, which can be used to heat the heat pump working medium. Optionally, the cold side outlet of the heat pump regenerator 2 can also be directly connected to the inlet of the second compressor 3, without using the external heating device 15 for heating. Furthermore, the first and second heat exchangers and the heat pump regenerator can be one or more heat exchangers in series.

[0062] The high-temperature heat storage module is connected in sequence by pipelines through the first heat exchanger 4, the high-temperature heat storage tank 9, the third heat exchanger 11, and the low-temperature heat storage tank 10. The heat storage medium inlet of the first heat exchanger 4 is connected to the low-temperature heat storage tank 10, and the heat storage medium outlet of the first heat exchanger 4 is connected to the high-temperature heat storage tank 9. The heat storage medium inlet of the third heat exchanger 11 is connected to the high-temperature heat storage tank 9, and the heat storage medium outlet of the third heat exchanger 11 is connected to the low-temperature heat storage tank 10. Preferably, the heat storage medium used in the high-temperature heat storage module is molten salt.

[0063] The low-temperature cold storage module is connected in sequence by a gas storage tank 13, the second heat exchanger 8 and a liquid storage tank 14 through pipelines.

[0064] Optionally, the circulating medium of the low-temperature cold storage module is one or more of, including but not limited to, methanol, ethanol, propane, pentane, hydrogen, ammonia, nitrogen, oxygen, natural gas, etc. Preferably, the cold storage medium of the low-temperature cold storage module is ammonia.

[0065] The power generation module is connected in sequence by the third heat exchanger 11, the second expander 16, the heat engine regenerator 17, the fifth heat exchanger 18, and the third compressor 19 through pipelines. The hot side inlet of the heat engine regenerator 17 is connected to the outlet of the second expander 16, and the hot side outlet of the heat engine regenerator 17 is connected to the fifth heat exchanger 18; the cold side inlet of the heat engine regenerator 17 is connected to the outlet of the third compressor 19, and the cold side outlet of the heat engine regenerator 17 is connected to the carbon dioxide inlet of the third heat exchanger 11. The second expander 16 is used to drive the power generation device 12 to generate electricity by expansion work.

[0066] The power generation device adopts one or more power generation methods including but not limited to supercritical carbon dioxide power cycle, steam power generation, organic Rankine cycle, air Brayton cycle and the like.

[0067] Optionally, the circulating medium of the power generation module is one or more of, including but not limited to, carbon dioxide, water vapor, air, argon, etc. Preferably, the power generation medium of the power generation module is supercritical carbon dioxide.

[0068] Example 2

[0069] This embodiment provides an operation method of a heat pump power storage system based on a novel heat recovery-cooling recovery-work recovery, including: a charging step and a discharging step;

[0070] The charging process of this embodiment is as follows Figure 2As shown: the photovoltaic power or wind power or grid valley power to be consumed drives the first compressor 1 and the second compressor 3 to operate. After being compressed by the first compressor 1, the air enters the heat pump regenerator 2 to absorb heat, and then is further heated by solar energy in the external heating device 15, preferably a solar heat collector, and then becomes a high-temperature and high-pressure gas after passing through the second compressor 3; the high-temperature and high-pressure gas enters the first heat exchanger 4 to transfer heat to the molten salt, and then enters the heat pump regenerator 2 again to release heat, and finally outputs the residual heat through the fourth heat exchanger 5 for heating; the air then enters the heat pump regenerator 6 to be cooled, and then enters the expander 7 to expand and do work to become a low-temperature and low-pressure state, and transfers the cold to the ammonia gas of the low-temperature cold storage module in the second heat exchanger 8, and returns to the inlet of the first compressor 1 again after absorbing heat from the heat pump regenerator 6. During the charging process, the heat pump regenerator 2 can recover the residual heat of the air from the first heat exchanger 4, the heat pump regenerator 6 can recover the residual cold after the air leaves the second heat exchanger 8, and the expander 7 can recover part of the expansion work.

[0071] During the charging process, the molten salt from the low-temperature heat storage tank 10 absorbs heat in the first heat exchanger 4 and then enters the high-temperature heat storage tank 9; in the low-temperature cold storage module, the ammonia from the gas storage tank 13 is cooled and liquefied in the second heat exchanger 8 and then enters the liquid storage tank 14. The gas raw material is regularly replenished to the gas storage tank 13 and the liquid ammonia is transported from the liquid storage tank for industrial needs.

[0072] The discharge process of this embodiment is as follows Figure 3 As shown: when peak load regulation is required, the discharge process is started. The high-temperature and high-pressure carbon dioxide working fluid leaving the carbon dioxide outlet of the third heat exchanger 11 enters the second expander 16 to perform work and drive the power generation device 12 to generate electricity, relieving the peak pressure of electricity consumption, and then releases heat in the heat engine regenerator 17, and finally enters the fifth heat exchanger 18 to transfer heat to the heat user, changing to a low-temperature and low-pressure state; the low-temperature and low-pressure carbon dioxide working fluid is compressed by the third compressor 19 and enters the heat engine regenerator 17 for preheating, and then absorbs the heat stored in the third heat exchanger 19 to return to a high-temperature and high-pressure state. In the high-temperature heat storage module of the discharge process, the molten salt from the high-temperature heat storage tank 9 releases heat to carbon dioxide in the third heat exchanger 11 and then returns to the low-temperature heat storage tank 10.

[0073] Whether charging or discharging, high-temperature steam or hot water can be generated to meet the heat demand of regional heating and industrial and agricultural heat. When charging, the heat energy can be output through the fourth heat exchanger to supply heat users, and when discharging, the waste heat of the power generation device can be output through the fifth heat exchanger to supply heat users. Furthermore, the fourth heat exchanger and the fifth heat exchanger can be a series connection of one or more heat exchangers.

[0074] In this embodiment, the system can generate high-temperature heat energy above 550°C and low-temperature cold energy below -50°C, and the charging and discharging efficiency can reach more than 60%. The heat pump proposed in this embodiment uses air as the working fluid, which is lower in cost than argon, helium, nitrogen, etc., and has relatively lower sealing requirements, a wider adjustable pressure range, and higher technical feasibility. The power generation module proposed in this embodiment uses supercritical carbon dioxide as the working fluid, has a higher power density, a smaller unit size, and a higher power generation efficiency.

[0075] In the description of this application, it should be understood that the temperature and other parameters mentioned are only examples for ease of understanding and are not limited to specific parameters; the working fluid state description used only represents the relative change of the state in the working fluid cycle and is not limited to specific state parameters;

[0076] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0077] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A heat pump power storage system based on heat recovery and cooling, characterized in that: It includes a heat pump circuit, a high-temperature heat storage module, a low-temperature cold storage module and a power generation module, wherein the high-temperature heat storage module and the low-temperature cold storage module are both connected to the heat pump circuit for heat exchange, and the power generation module is connected to the high-temperature heat storage module for heat exchange; The heat pump circuit and the power generation module are both connected to the external power grid, the power generation module is used to supply power to the external power grid, the heat pump circuit is driven by the power to be consumed, and is used to absorb heat from the low-temperature cold storage module and release heat to the high-temperature heat storage module, wherein the low-temperature cold storage module is used to store low-temperature cold energy, and the high-temperature heat storage module is used to store high-temperature heat energy; The heat pump circuit comprises a first compressor (1), a second compressor (3), a heat pump regenerator (2), a first heat exchanger (4), a fourth heat exchanger (5), a heat pump regenerator (6), a first expander (7) and a second heat exchanger (8); The first compressor (1), the cold side of the heat pump regenerator (2), the second compressor (3), the first heat exchanger (4), the hot side of the heat pump regenerator (2), the fourth heat exchanger (5), the hot side of the heat pump regenerator (6), the first expander (7), the second heat exchanger (8) and the cold side of the heat pump regenerator (6) are connected in sequence through pipelines to form a loop; The first heat exchanger (4) is used for heat exchange with a high-temperature heat storage module, and the second heat exchanger (8) is used for heat exchange with a low-temperature cold storage module.

2. The heat pump power storage system based on heat recovery and cooling according to claim 1 is characterized in that: The heat pump circuit also includes an external heating device (15); The cold side inlet of the heat pump regenerator (2) is connected to the outlet of the first compressor (1), the cold side outlet of the heat pump regenerator (2) is connected to the inlet of the external heating device (15), and the hot side inlet of the heat pump regenerator (2) is connected to the heat pump working medium outlet of the first heat exchanger (4); The hot side outlet of the heat pump regenerator (2) is connected to the fourth heat exchanger (5), and the fourth heat exchanger (5) is used to output waste heat for heat supply. The hot side inlet of the heat pump regenerator (6) is connected to the fourth heat exchanger (5); The hot side outlet of the heat pump recooler (6) is connected to the inlet of the first expander (7), the outlet of the first expander (7) is connected to the heat pump working medium inlet of the second heat exchanger (8), the cold side inlet of the heat pump recooler (6) is connected to the heat pump working medium outlet of the second heat exchanger (8), and the cold side outlet of the heat pump recooler (6) is connected to the inlet of the first compressor (1); The first compressor (1) and the second compressor (3) are both connected to an external power grid and driven by the power to be consumed.

3. The heat pump power storage system based on heat recovery and cooling according to claim 1 is characterized in that: The high-temperature heat storage module comprises a high-temperature heat storage tank (9), a third heat exchanger (11), a low-temperature heat storage tank (10), and a first heat exchanger (4) which are sequentially connected through pipelines to form a loop; The heat storage medium inlet of the first heat exchanger (4) is connected to a low-temperature heat storage tank (10), the heat storage medium outlet of the first heat exchanger (4) is connected to a high-temperature heat storage tank (9), the heat storage medium inlet of the third heat exchanger (11) is connected to the high-temperature heat storage tank (9), and the heat storage medium outlet of the third heat exchanger (11) is connected to the low-temperature heat storage tank (10); The first heat exchanger (4) is used as a common component between the high-temperature heat storage module and the heat pump circuit, and is used for heat exchange between the high-temperature heat storage module and the heat pump circuit. The third heat exchanger (11) is used as a common component between the high-temperature heat storage module and the power generation module, and is used for heat exchange between the high-temperature heat storage module and the power generation module.

4. The heat pump power storage system based on heat recovery and cooling according to claim 3 is characterized in that: The heat storage medium used in the high-temperature heat storage module is molten salt.

5. The heat pump power storage system based on heat recovery and cooling according to claim 1 is characterized in that: The low-temperature cold storage module comprises a gas storage tank (13), a second heat exchanger (8) and a liquid storage tank (14), wherein the gas storage tank (13), the second heat exchanger (8) and the liquid storage tank (14) are connected in sequence via pipelines; The second heat exchanger (8) is a common component of the low-temperature cold storage module and the heat pump circuit, and is used for heat exchange between the low-temperature cold storage module and the heat pump circuit.

6. The heat pump power storage system based on heat recovery and cooling according to claim 5 is characterized in that: The cold storage medium of the low-temperature cold storage module includes but is not limited to one or more of methanol, ethanol, propane, pentane, hydrogen, ammonia, nitrogen, oxygen, natural gas, etc.

7. The heat pump power storage system based on heat recovery and cooling according to claim 1 is characterized in that: The power generation module comprises a third heat exchanger (11), a second expander (16), a heat engine regenerator (17), a fifth heat exchanger (18) and a third compressor (19) which are sequentially connected through pipelines, and the fifth heat exchanger (18) is used to output waste heat for heat supply; The outlet of the third heat exchanger (11) is connected to the inlet of the second expander (16), the hot side inlet of the heat engine regenerator (17) is connected to the outlet of the second expander (16), the hot side outlet of the heat engine regenerator (17) is connected to the fifth heat exchanger (18), the cold side inlet of the heat engine regenerator (17) is connected to the outlet of the third compressor (19), and the cold side outlet of the heat engine regenerator (17) is connected to the inlet of the third heat exchanger (11); The second expander (16) is connected to a power generation device (12) and is used to drive the power generation device (12) to generate electricity; the power generation device (12) is connected to an external power grid.

8. The heat pump power storage system based on heat recovery and cooling according to claim 7 is characterized in that: The working fluid of the heat pump circuit is one of air, argon, nitrogen, helium, carbon dioxide, etc., and the working fluid of the power generation module is one or more of carbon dioxide, water vapor, air, argon, etc.

9. An operating method of a heat pump power storage system based on heat recovery and cooling, characterized in that: The heat pump power storage system based on heat recovery and cooling according to any one of claims 1 to 8 comprises the following steps: Charging step: Electric power is consumed to drive the first compressor (1) and the second compressor (3) to operate; the heat pump working fluid is compressed by the first compressor (1) and enters the heat pump regenerator (2) to absorb heat; then, it is heated in the external heating device (15) and then pressurized by the second compressor (3) to form high-temperature and high-pressure gas; The high-temperature and high-pressure gas enters the first heat exchanger (4) to exchange heat with the high-temperature heat storage module, then enters the heat pump regenerator (2) again to release heat, then enters the heat pump regenerator (6) to be cooled, then enters the first expander (7) to perform work and become low-temperature and low-pressure gas, the low-temperature and low-pressure gas enters the second heat exchanger (8) to exchange heat with the low-temperature heat storage module, and returns to the inlet of the first compressor (1) after absorbing heat from the heat pump regenerator (6); Discharging step: the working fluid in a high-temperature and high-pressure state leaving the outlet of the third heat exchanger (11) enters the second expander (16) to perform work and drive the power generation device (12) to generate electricity, then releases heat in the heat engine regenerator (17) to change to a low-temperature and low-pressure state, the working fluid in a low-temperature and low-pressure state is compressed by the third compressor (19) and enters the heat engine regenerator (17) for preheating, then absorbs the heat stored in the high-pressure heat storage module in the third heat exchanger (11) to change back to a high-temperature and high-pressure state.

10. The operating method of the heat pump power storage system based on heat recovery and cooling according to claim 9, characterized in that: In the charging step, the gas after heat exchange in the first heat exchanger (4) enters the heat pump regenerator (2) to release heat, and after releasing heat, the residual heat is output through the fourth heat exchanger (5) for heating, and then enters the heat pump regenerator (6) to be cooled; In the discharge step, the working fluid that has released heat through the heat engine regenerator (17) enters the fifth heat exchanger (18) to transfer heat to the heat user, and changes to a low-temperature and low-pressure state.

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