High-temperature energy storage power generation system

Abstract

A high-temperature energy storage power generation system comprises an isothermal compression system, an isothermal expansion system, a high-temperature energy storage system, a heat recovery device, a second gas storage tank, a third gas storage tank, a control device, a power generation circulating working medium, an energy storage circulating medium and connecting pipelines among the components. The isothermal expansion system comprises n stages of isothermal expansion machines, a plurality of heat exchangers and a compressed working medium pipeline; the heat exchanger is mounted between every two stages of isothermal expansion machines or between the third gas storage tank and the first stage of isothermal expansion machine; the high-temperature energy storage system comprises a power supply system, a heating controller, a high-temperature heat storage device, an air pump and a first air storage tank; the air pump, the first air storage tank, the heat exchanger of the isothermal expansion system and the high-temperature heat storage device are communicated in sequence; the isothermal compression system is mounted between an outlet of the second gas storage tank and an inlet of the heat recovery device; the third gas storage tank is mounted between an outlet of the heat recovery device and an inlet of the isothermal expansion system; an outlet of the isothermal expansion system communicates with an inlet of the heat recovery device. An outlet of the heat recovery device communicates with an inlet of the second gas storage tank.

Description

Technical Field

[0001] The utility model belongs to the technical field of energy storage, and particularly relates to a high-temperature energy storage power generation system. Background Art

[0002] With the increasing global demand for clean energy, renewable energy sources such as solar energy and wind energy have become important directions for the transformation of the energy structure. However, these energy sources are intermittent and unstable, and how to effectively store and utilize these energies has become an urgent problem to be solved. In this context, energy storage technologies, especially high-temperature energy storage technologies, have gradually become a research hotspot. The high-temperature energy storage technology can convert renewable energy into heat energy and store it, and can stably release energy when needed to provide reliable power support for the power grid. As an innovative achievement in this field, the high-temperature energy storage power generation system of the utility model integrates advanced technologies such as isothermal compression, isothermal expansion, high-temperature energy storage, and heat recovery, providing strong support for the efficient utilization of renewable energy. Summary of the Invention

[0003] The utility model provides a high-temperature energy storage power generation system, which combines isothermal compression, isothermal expansion, high-temperature energy storage, and heat recovery into one, realizes closed-loop compression of inert gas for power generation, can be used as a backup energy source, and forms a new energy supply mode.

[0004] Specifically described as follows: A high-temperature energy storage power generation system includes an isothermal compression system, an isothermal expansion system, a high-temperature energy storage system, a heat recovery device, a second gas storage tank, a third gas storage tank, a control device, a power generation cycle working medium, an energy storage cycle medium, and the connecting pipelines between them;

[0005] The isothermal expansion system includes an isothermal expander, a heat exchanger, and a compressed working medium pipeline; the isothermal expander includes an n-stage isothermal expander (n≥2); the heat exchanger includes a plurality of heat exchangers equal in number to the isothermal expander, and the power generation cycle working medium channels of the heat exchanger are installed on the expansion working medium pipelines between every two stages of the isothermal expander or on the working medium pipelines between the third gas storage tank and the first-stage isothermal expander;

[0006] The high-temperature energy storage system includes a power supply system, a heating controller, a high-temperature heat storage device, an air pump, and a first gas storage tank; the power supply system is electrically connected to the heating controller, the heating controller is electrically connected to the high-temperature heat storage device, the inlet of the first gas storage tank is communicated with the energy storage cycle medium outlet of the heat exchanger of the isothermal expansion system, and its outlet is communicated with the inlet of the air pump; the outlet of the air pump is communicated with the energy storage cycle medium inlet of the high-temperature heat storage device; the energy storage cycle medium outlet of the high-temperature heat storage device is communicated with the energy storage cycle medium inlet of the heat exchanger of the isothermal expansion system;

[0007] The inlet of the working fluid for the power generation cycle of the isothermal compression system is connected to the outlet of the working fluid for the power generation cycle of the second gas storage tank. The outlet of the working fluid for the power generation cycle of the isothermal compression system is communicated with the inlet of the power generation cycle working fluid channel of the heat recovery device. The outlet of the power generation cycle working fluid channel of the heat recovery device is connected to the inlet of the working fluid for the power generation cycle of the third gas storage tank. The outlet of the working fluid for the power generation cycle of the third gas storage tank is connected to the inlet of the working fluid for the power generation cycle of the isothermal expansion system. The tail gas outlet of the isothermal expansion system is connected to the inlet of the tail gas channel of the heat recovery device. The heat recovery device recovers the heat of the tail gas after expansion work to preheat the compressed gas before work. The outlet of the tail gas channel of the heat recovery device is connected to the inlet of the second gas storage tank.

[0008] Further, the high-temperature heat storage device includes a housing of the heat storage device, an energy storage medium located inside the housing, heating tapes, a fluid heat exchange channel, an electrical access terminal, an inlet of the energy storage circulation medium, and an outlet of the energy storage circulation medium. The heating tapes and the fluid heat exchange channel are uniformly arranged around the energy storage medium inside the heat storage device. The energy storage circulation medium circulates inside the fluid heat exchange channel. The electrical access terminal is connected to the heating tapes. The inlet and outlet of the energy storage circulation medium are communicated with both ends of the fluid heat exchange channel. The outlet of the air pump is connected to the inlet of the energy storage circulation medium, and its inlet is connected to the outlet of the first gas storage tank.

[0009] Further, the isothermal compression system includes an isothermal compressor, a cooler, and a compression working fluid pipeline therebetween. The isothermal compressor is a multi-stage isothermal compressor, including an m-stage compressor (m≥2). The inlet of the working fluid for the power generation cycle of the first-stage isothermal compressor is connected to the outlet of the working fluid for the power generation cycle of the second gas storage tank. The outlet of the last-stage isothermal compressor is communicated with the inlet of the power generation cycle working fluid channel of the heat recovery device. The cooler is installed on the compression working fluid pipeline between every two stages of isothermal compressors and includes 2m - 1 condensers.

[0010] Further, the inlet / outlet of the power generation cycle working fluid channel of the cooler is respectively connected to the outlet of the power generation cycle working fluid of the upper-stage isothermal compressor / the inlet of the power generation cycle working fluid of the lower-stage isothermal compressor.

[0011] Further, the inlet / outlet of the energy storage circulation medium channel of each heat exchanger is respectively connected to the outlet of the energy storage circulation medium of the high-temperature heat storage device / the inlet of the first gas storage tank.

[0012] Further, the working fluid for the power generation cycle is helium or argon.

[0013] Further, the energy storage circulation medium is an inert gas with strong stability, such as helium or argon.

[0014] Furthermore, the power supply system includes off-peak electricity, wind power and photovoltaic power, which is used to heat the energy storage medium in the heat storage device through the heating belt, and convert the low-cost electricity and unstable wind power or photovoltaic power into thermal energy and store it in the high-temperature heat storage device.

[0015] Furthermore, the energy storage medium is a molten salt, such as halides of alkali metals and alkaline earth metals, as well as nitrates, sulfates, and the like.

[0016] Furthermore, the energy storage medium is solid energy storage particles, such as quartz, metal or carbonate particles, and the solid energy storage particles are filled with an inert protective gas, such as nitrogen.

[0017] The advantages of this utility model are as follows: the high-temperature energy storage power generation system integrates cutting-edge technologies, integrating isothermal compression, isothermal expansion, efficient high-temperature energy storage and advanced heat recovery mechanisms. The system cleverly utilizes renewable energy sources such as valley electricity, wind power or photovoltaic power, and converts excess electricity into thermal energy and efficiently stores it in a high-temperature heat storage device during low electricity consumption periods or when wind energy and light energy are abundant. The multi-stage isothermal expander design accurately transfers the thermal energy in the high-temperature heat storage device through the energy storage circulation medium, heats the power generation circulation medium step by step, realizes isothermal multi-stage expansion at high temperatures, and significantly improves energy conversion efficiency.

[0018] The system is equipped with precision control devices to ensure that all components work together, optimize the energy flow path, and achieve efficient energy storage and on-demand release. In addition, the innovative heat recovery device effectively captures the heat of the exhaust gas after expansion work, which is used to preheat the power generation cycle working fluid that is about to enter the expansion process, further reducing energy loss and improving the overall system efficiency.

[0019] This series of advantages not only optimizes every link of energy storage and power generation, but also significantly improves the comprehensive utilization rate of energy, demonstrating great potential and value in promoting the large-scale application of renewable energy and innovation in energy storage technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of the structure and principle of the power generation system of the utility model.

[0022] Figure 2 It is a schematic diagram of the structure and principle of the high-temperature heat storage device of the utility model.

[0023] The meanings represented by the serial numbers in the above figures are as follows: 1 isothermal compressor; 11 primary isothermal compressor; 12 secondary isothermal compressor; 1m final-stage isothermal compressor; 2 cooler; 21 primary cooler; 22 secondary cooler; 2m-1 final-stage cooler; 3 heat recovery device; 41 first gas storage tank; 42 second gas storage tank; 43 third gas storage tank; 5 heat exchanger; 51 primary heat exchanger; 52 secondary heat exchanger; 5n final-stage heat exchanger; 6 isothermal expander; 61 primary isothermal expander; 62 secondary isothermal expander; 6n final-stage isothermal expander; 71 off-peak electricity; 72 wind power; 73 photovoltaic power; 8 heating controller; 9 high-temperature heat storage device; 91 electricity access terminal; 92 gas inlet; 93 energy storage circulating medium outlet; 94 solid heat storage particles; 95 heating tape; 96 fluid heat exchange channel; 10 air pump; 111 control device; Detailed implementation manners

[0024] To make the objectives, technical solutions and advantages of the present utility model clearer, the technical solutions of the present utility model will be described in detail below.

[0025] Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.

[0026] Based on the embodiments of the present utility model, all other implementation manners obtained by those of ordinary skill in the art without creative efforts fall within the scope protected by the present utility model. To make the embodiments easier to understand, multiple embodiments or implementation methods are provided below to illustrate the related devices, modules and functions of the present utility model.

[0027] To enable the readers of this embodiment to quickly understand the implementation manner of the present utility model, the working principle expressed in the attached Figure 1 will be described first.

[0028] As shown in the attached Figure 1As shown in the figure, a high-temperature energy storage power generation system includes: an isothermal compression system, an isothermal expansion system, a high-temperature energy storage system, a heat recovery device 3, a second gas storage tank 42, a third gas storage tank 43, a control device 111, a power generation cycle working fluid, and the connecting pipelines between them. The power generation cycle working fluid inlet of the isothermal compression system is connected to the power generation cycle working fluid outlet of the second gas storage tank 42, the power generation cycle working fluid outlet of the isothermal compression system is communicated with the power generation cycle working fluid channel inlet of the heat recovery device 3, and the outlet of the power generation cycle working fluid channel of the heat recovery device 3 is communicated with the power generation cycle working fluid inlet of the third gas storage tank 43; the power generation cycle working fluid outlet of the third gas storage tank 43 is connected to the power generation cycle working fluid inlet of the isothermal expansion system; the tail gas outlet of the isothermal expansion system is communicated with the tail gas channel inlet of the heat recovery device 3, and the heat recovery device 3 recovers the tail gas heat after expansion work to preheat the compressed gas before work; the tail gas channel outlet of the heat recovery device 3 is connected to the inlet of the second gas storage tank 42.

[0029] The power generation cycle working fluid is one of helium or argon.

[0030] The high-temperature energy storage system includes a power supply system, a heating controller 8, a high-temperature heat storage device 9, an air pump 10, and a first gas storage tank 41. Please refer to Figure 2 As shown in the figure, the high-temperature heat storage device 9 includes a housing of the heat storage device, an energy storage medium 94 located inside the housing, a heating belt 95, a fluid heat exchange channel 96, an electrical access terminal 91, an energy storage cycle medium inlet 92, an energy storage cycle medium outlet 93, and an energy storage cycle medium. The heating belt 96 and the fluid heat exchange channel 96 are evenly arranged around the energy storage medium 94 inside the heat storage device. The heating belt 96 is used to heat the energy storage medium 94, and the fluid heat exchange channel 96 is used to obtain the heat of the heat storage medium 94 and transfer the heat in the heat storage medium 94 to the required place, realizing the effective utilization of heat; the electrical access terminal 91 is connected to the heating belt 96, and the energy storage cycle medium inlet 92 and the energy storage cycle medium outlet 93 are communicated with both ends of the fluid heat exchange channel 96. The outlet of the air pump 1 is communicated with the energy storage cycle medium inlet 92, and its inlet is connected to the outlet of the first gas storage tank 41.

[0031] The energy storage cycle medium is an inert gas with strong stability, such as helium or argon. In the present invention, helium is preferably selected.

[0032] The power supply system includes off-peak electricity 71, wind power 72, and photovoltaic power 73, which are used to heat the energy storage medium 94 in the heat storage device through the heating belt 96, and convert low-cost electricity and unstable wind power or photovoltaic power into thermal energy and store it in the high-temperature heat storage device 9.

[0033] The energy storage medium 94 is molten salt, such as halides of alkali metals and alkaline earth metals, as well as nitrates, sulfates, etc.

[0034] The energy storage medium 94 is solid energy storage particles, such as quartz stones, metals or carbonate particles, etc. At the same time, an inert protective gas, such as nitrogen, is filled around the solid energy storage particles.

[0035] The isothermal compression system includes an isothermal compressor 1, a cooler 2 and the compression working medium pipeline between them; the function of the isothermal compressor 1 is to inhale the power generation cycle working medium in the second gas storage tank 42, perform multi-stage isothermal compression on the power generation cycle working medium, and boost the pressure of the power generation cycle working medium. The isothermal compressor 1 is a multi-stage isothermal compressor, including m-stage compressors 11 to 1m (m≥2); the power generation cycle working medium inlet of the first-stage isothermal compressor 11 is connected to the power generation cycle working medium outlet of the second gas storage tank 42, and the outlet of the last-stage isothermal compressor 1m is communicated with the power generation cycle working medium channel inlet of the heat recovery device 3.

[0036] The cooler 2 is installed on the compression working medium pipeline between every two-stage isothermal compressors and includes 2m - 1 condensers; the inlet / outlet of the power generation cycle working medium channel of the cooler 2 is respectively connected to the power generation cycle working medium outlet of the previous-stage isothermal compressor / the power generation cycle working medium inlet of the next-stage isothermal compressor; the function of the cooler 2 is to dissipate the heat generated by the isothermal compressor 1 to the outside, keep the compression process at a lower temperature, and achieve approximate "isothermal compression".

[0037] If the cooler 2 is a water-cooled cooler, the inlet / outlet of the cooling medium channel of the cooler 2 is respectively connected to the outlet / inlet of the cold water source; if the cooler 2 is an air-cooled cooler, the inlet / outlet of the cooling medium channel of the cooler 2 is both connected to the air.

[0038] The isothermal expansion system includes an isothermal expander 6, a heat exchanger 5 and a compression working medium pipeline; the isothermal expander 6 includes n-stage isothermal expanders (n≥2); the heat exchanger 5 includes multiple heat exchangers with the same number as the isothermal expander 6, and the power generation cycle working medium channel of the heat exchanger 5 is installed on the expansion working medium pipeline between every two-stage isothermal expanders or on the working medium pipeline between the third gas storage tank 41 and the first-stage isothermal expander 61, that is, the power generation cycle working medium channel of the first-stage heat exchanger 51 is installed between the outlet of the third gas storage tank 41 and the working medium inlet of the first-stage isothermal expander 61, and the inlet / outlet of the power generation cycle working medium channels of the heat exchangers 52 to 5n are respectively connected to the working medium outlet of the previous-stage isothermal expander / the working medium inlet of the next-stage isothermal expander; the working medium outlet of the last-stage isothermal expander 6n is connected to the tail gas inlet of the heat recovery device 3.

[0039] All the heat exchangers 5 are countercurrent heat exchangers.

[0040] The heat recovery device 3 is a countercurrent heat exchanger, and its function is to recover the heat obtained through isothermal expansion for preheating the compressed working fluid before it does work, that is, the compressed working fluid discharged from the last-stage compressor 1m exchanges heat with the tail gas discharged from the last-stage isothermal expander 6n in the heat recovery device 3, and the compressed working fluid absorbs the heat of the tail gas to achieve preheating, and then enters the third gas storage tank 43.

[0041] The energy storage circulation medium channel inlet / outlet of each heat exchanger 51-5n is respectively connected to the energy storage circulation medium outlet 93 of the high-temperature heat storage device 9 / the inlet of the first gas storage tank 41. In this way, the energy storage circulation medium obtains heat from the energy storage medium 94 in the high-temperature heat storage device 9, and heats the power generation circulation medium through the heat exchanger 51-5n. The heated power generation circulation medium directly drives the corresponding isothermal expander 61-6n to generate power.

[0042] The high temperature energy storage power generation system of the utility model is divided into an energy storage process and a power generation process. In this embodiment, helium is selected as the power generation cycle medium and the energy storage cycle medium.

[0043] The working principle of the energy storage process is as follows: the heating controller 8 is turned on, and the heating controller 8 is responsible for regulating the valley power, wind power or photovoltaic energy to be directly transmitted to the heating belt 95, thereby heating the energy storage medium 94 in the high-temperature heat storage device 9. In this process, the heating controller 8 accurately controls the start and stop of these renewable energy sources to achieve efficient and intelligent energy utilization.

[0044] The power generation process is as follows: The primary isothermal compressor 11 sucks in the working medium helium from the second gas storage tank 42 for compression, and both the temperature and pressure of the working medium helium increase; to avoid too much increase in the working medium temperature, the helium gas after being pressurized once by the primary isothermal compressor 11 directly enters the primary cooler 21 for temperature reduction, and after the temperature reduction, the helium gas after being pressurized once enters the secondary isothermal compressor 12 for secondary pressurization, and then enters the secondary cooler 22 for temperature reduction. This continues until it is compressed to the predetermined pressure in the final-stage isothermal compressor 1m, and then directly enters the heat recovery device 3 to exchange heat with the high-temperature final exhaust gas discharged from the final-stage isothermal expander 6n. The compressed helium gas is preheated by the high-temperature final exhaust gas and becomes compressed helium gas at high pressure and medium temperature, and then enters the power generation cycle medium channel of the primary heat exchanger 51. At the same time, under the action of the air pump 1, the energy storage cycle medium absorbs the energy storage medium 94 in the high-temperature heat storage device 9 and is sent into the energy storage cycle medium channel of the primary heat exchanger 51 through the energy storage cycle medium outlet 93 of the high-temperature heat storage device 9, transferring the heat of the energy storage medium 94 to the compressed helium gas at high pressure and medium temperature. The compressed helium gas at high pressure and medium temperature is heated and becomes high-pressure and high-temperature helium gas, and then drives the isothermal primary expander 61 to do work, and at the same time, it cools down and reduces pressure during the expansion process itself; the helium gas that has cooled down and reduced pressure discharged from the isothermal primary expander 61 enters the secondary heat exchanger 52, is heated by the energy storage cycle medium coming out of the high-temperature heat storage device 9 and is transformed into high-temperature helium gas, drives the isothermal secondary expander 62 to generate power and do work, and then cools down and reduces pressure again; in this way, before the power generation cycle working medium drives the expander 6 each time, it first undergoes a heating process (that is, the power generation cycle working medium is heated by the energy storage cycle medium coming out of the high-temperature heat storage device 9 in the corresponding heat exchanger 5), and the heated power generation cycle working medium drives the corresponding expander to generate power for power generation, until the final expander 6n. The exhaust gas discharged from the final expander 6n directly enters the heat recovery device 3 for heat recovery, and the exhaust gas discharged from the heat recovery device 3 directly enters the second gas storage tank 42 for use in the next power generation cycle process. Such a cyclic operation completes the entire cycle process.

[0045] As described above, the main purpose of adopting multi-stage compression is to avoid too high a temperature rise during the compression process because we want to achieve "approximate" isothermal compression. The entire compression process is completed by the isothermal compressor 1.

[0046] To achieve approximate isothermal compression, the cooler 2 is used to dissipate the compression heat of each stage of the isothermal compression mechanism to the external air; for this purpose, a cooler 2 is installed between every two stages of the isothermal compression mechanism to timely dissipate the compression heat.

[0047] As described above, the main purpose of adopting multi-stage isothermal expansion is: through multi-stage isothermal expansion, the pressure of the working fluid is gradually reduced, avoiding large temperature differences and low efficiency during the expansion process, because we want to achieve "approximate" isothermal expansion. The entire expansion process is completed by the isothermal expander 6. To achieve approximate isothermal expansion, the working fluid of the power generation cycle before entering the isothermal expander 6 first enters the heat exchanger 5 for heating, and the heated working fluid of the power generation cycle drives the corresponding expander to generate power for power generation.

[0048] To further improve the embodiment of the present invention, a control scheme for the gas engine in this embodiment is provided here, that is: a set of control device 111 is provided for this power generation system. A relatively preferred control device is the DCS system. Using this DCS system, each component of the gas engine can be comprehensively controlled hierarchically and the mutual influence between each controller device can be reduced. The DCS control system collects the working parameters of each component of the system of the present invention, including but not limited to temperature, pressure, flow rate, stress, displacement, vibration, position, current, voltage, resistance, frequency, power, and comprehensively controls and protects the operation of each component.

Claims

1. A high-temperature energy storage power generation system, characterized in that, It includes an isothermal compression system, an isothermal expansion system, a high-temperature energy storage system, a heat recovery device, a second gas storage tank, a third gas storage tank, a control device, a power generation cycle working fluid, an energy storage cycle medium, and the connecting pipelines therebetween; The isothermal expansion system includes an isothermal expander, a heat exchanger, and a compressed working fluid pipeline; the isothermal expander includes an n-stage isothermal expander (n≥2); the heat exchanger includes a plurality of heat exchangers equal in number to the isothermal expander, and the power generation cycle working fluid channels of the heat exchanger are installed on the expansion working fluid pipelines between every two stages of the isothermal expander or on the working fluid pipelines between the third gas storage tank and the first-stage isothermal expander; The high-temperature energy storage system includes a power supply system, a heating controller, a high-temperature heat storage device, a gas pump, and a first gas storage tank; the power supply system is electrically connected to the heating controller, and the heating controller is electrically connected to the high-temperature heat storage device. The inlet of the first gas storage tank is communicated with the energy storage cycle medium outlet of the heat exchanger of the isothermal expansion system, and its outlet is communicated with the inlet of the gas pump; the outlet of the gas pump is communicated with the energy storage cycle medium inlet of the high-temperature heat storage device; the energy storage cycle medium outlet of the high-temperature heat storage device is communicated with the energy storage cycle medium inlet of the heat exchanger of the isothermal expansion system; The power generation cycle working fluid inlet of the isothermal compression system is connected to the power generation cycle working fluid outlet of the second gas storage tank. The power generation cycle working fluid outlet of the isothermal compression system is communicated with the inlet of the power generation cycle working fluid channel of the heat recovery device. The outlet of the power generation cycle working fluid channel of the heat recovery device is communicated with the power generation cycle working fluid inlet of the third gas storage tank; the power generation cycle working fluid outlet of the third gas storage tank is communicated with the power generation cycle working fluid inlet of the isothermal expansion system; the tail gas outlet of the isothermal expansion system is communicated with the inlet of the tail gas channel of the heat recovery device. The heat recovery device recovers the tail gas heat after expansion work to preheat the compressed gas before work; the outlet of the tail gas channel of the heat recovery device is communicated with the inlet of the second gas storage tank.

2. The high-temperature energy storage power generation system according to claim 1, characterized in that The high-temperature heat storage device includes a housing of the heat storage device, an energy storage medium located inside the housing, heating tapes, a fluid heat exchange channel, an electrical access terminal, an energy storage cycle medium inlet, and an energy storage cycle medium outlet; the heating tapes and the fluid heat exchange channel are evenly arranged around the energy storage medium inside the heat storage device; The energy storage cycle medium circulates inside the fluid heat exchange channel; the electrical access terminal is connected to the heating tapes, and the energy storage cycle medium inlet and the energy storage cycle medium outlet are communicated with both ends of the fluid heat exchange channel; the outlet of the gas pump is communicated with the energy storage cycle medium inlet, and its inlet is communicated with the outlet of the first gas storage tank.

3. A high-temperature energy storage power generation system according to claim 1, wherein The isothermal compression system includes an isothermal compressor, a cooler, and the compressed working fluid pipeline therebetween; the isothermal compressor is a multi-stage isothermal compressor, including an m-stage compressor (m≥2); the power generation cycle working fluid inlet of the first-stage isothermal compressor is connected to the power generation cycle working fluid outlet of the second gas storage tank, and the outlet of the last-stage isothermal compressor is communicated with the inlet of the power generation cycle working fluid channel of the heat recovery device; the cooler is installed on the compressed working fluid pipeline between every two stages of the isothermal compressor and includes 2m - 1 condensers.

4. A high-temperature energy storage power generation system according to claim 3, characterized in that the inlet / outlet of the power generation cycle working fluid passage of the cooler is respectively connected to the power generation cycle working fluid outlet of the upper-stage isothermal compressor / the power generation cycle working fluid inlet of the lower-stage isothermal compressor.

5. A high-temperature energy storage power generation system according to claim 1, characterized in that The inlet / outlet of the energy storage cycle medium passage of each heat exchanger is respectively communicated with the energy storage cycle medium outlet of the high-temperature heat storage device / the inlet of the first gas storage tank.

6. The high-temperature energy storage power generation system according to claim 1, characterized in that, The power generation cycle working fluid is helium or argon.

7. A high-temperature energy storage power generation system according to claim 1, characterized in that the energy storage cycle medium is an inert gas with strong stability, such as helium or argon.

8. A high-temperature energy storage power generation system according to claim 1, characterized in that the power supply system includes off-peak electricity, wind power and photovoltaic power, and is used to heat the energy storage medium in the heat storage device through a heating belt, and convert low-price electricity and unstable wind power or photovoltaic power into thermal energy and store it in the high-temperature heat storage device.

9. A high-temperature energy storage power generation system according to claim 2, characterized in that, The energy storage medium is molten salt, such as halides of alkali metals and alkaline earth metals, as well as nitrates and sulfates.

10. A high-temperature energy storage power generation system according to claim 2, characterized in that, The energy storage medium is solid energy storage particles, such as quartz stones, metals or carbonate particles, and at the same time, an inert protective gas, such as nitrogen, is filled around the solid energy storage particles.

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