Carbon dioxide energy storage system based on external cold and heat source utilization

Abstract

The utility model discloses a carbon dioxide energy storage system based on external cold and heat source utilization. The carbon dioxide energy storage system comprises a cold source utilization system, a heat source utilization system, a low-pressure carbon dioxide storage tank, an energy storage low-pressure heat exchange assembly, a compressor, an energy storage high-pressure heat exchange assembly, a liquefaction assembly, a high-pressure carbon dioxide storage tank, a vaporization assembly and an energy release high-pressure heat exchange assembly, a turbine and an energy-releasing low-pressure heat exchange assembly; the cold source utilization system and the heat source utilization system are used for providing cold energy and heat energy required by carbon dioxide liquefaction and vaporization for the liquefaction assembly and the vaporization assembly; meanwhile, the cold source utilization system and the heat source utilization system are used for storing cold and heat by absorbing natural cold and heat sources, so that the cost in the energy storage and release process is reduced. In addition, the heat storage device can operate for a long time to store heat under the condition that natural cold and heat source conditions are rich, and the power of a cold source utilization device and a heat source utilization device is effectively reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of physical energy storage, and in particular relates to a carbon dioxide energy storage system based on the utilization of external cold and heat sources. Background Art

[0002] my country's economy continues to grow rapidly, leading to rising electricity demand. However, coal remains the dominant energy source, and coal-fired power generation will likely maintain a significant share for a long time to come. This poses a significant challenge to achieving both carbon peak and carbon neutrality, as the scope for carbon reduction is limited. Achieving the dual carbon goals requires building a new power system dominated by renewable energy. However, renewable energy is subject to natural constraints and exhibits significant volatility and intermittency. Large-scale grid integration can compromise the safe and stable operation of the power grid, resulting in low utilization rates and significant development challenges.

[0003] Amid the rapid development of new energy sources, new energy storage has become a key component in building a new power system. Liquid CO2 energy storage converts electrical energy into the thermal and potential energy of CO2 for energy storage. Compared to air, CO2 is easier to liquefy, eliminating the need for underground caverns and offering greater flexibility in site selection. Furthermore, CO2 has a high specific heat capacity and excellent heat transfer properties, resulting in lower parasitic energy consumption and higher system efficiency. Therefore, liquid CO2 energy storage offers significant advantages, including ultra-long-term storage, large-scale operation, high flexibility, high efficiency, and high energy storage density, making it a promising candidate for future development.

[0004] However, the liquid carbon dioxide energy storage system requires a large amount of cooling and heat to liquefy and vaporize carbon dioxide, which requires refrigeration and heating equipment to generate additional cooling and heat, or to achieve the liquefaction and vaporization of carbon dioxide through pressure loss, resulting in a decrease in the system's electric-to-electricity conversion efficiency. Summary of the Invention

[0005] The purpose of the utility model is to provide a carbon dioxide energy storage system based on the utilization of external cold and heat sources.

[0006] The utility model provides a carbon dioxide energy storage system based on the utilization of external cold and heat sources, which includes a cold source utilization system, a heat source utilization system, and a low-pressure carbon dioxide storage tank, an energy storage low-pressure heat exchange component, a compressor, an energy storage high-pressure heat exchange component, a liquefaction component, a high-pressure carbon dioxide storage tank, a vaporization component, an energy release high-pressure heat exchange component, a turbine and an energy release low-pressure heat exchange component, which are sequentially connected to form an energy storage and release circulation loop.

[0007] The liquefaction assembly is provided with a first liquefaction heat exchange pathway and a second liquefaction heat exchange pathway; the vaporization assembly is provided with a first vaporization heat exchange pathway and a second vaporization heat exchange pathway. The first liquefaction heat exchange pathway of the liquefaction assembly and the first vaporization heat exchange pathway of the vaporization assembly are connected to the energy storage and release circulation loop. The cold source utilization system is connected to the second liquefaction heat exchange pathway of the liquefaction assembly to collect ambient cold energy and supply it to the liquefaction assembly. The heat source utilization system is connected to the second vaporization heat exchange pathway of the vaporization assembly to collect ambient heat and supply it to the vaporization assembly.

[0008] During operation, the energy storage system switches between energy storage and energy release. The cold source utilization system collects external cold energy and stores and provides the cold energy required to liquefy the gaseous carbon dioxide in the liquefied component during the energy storage process. The heat source utilization system collects external heat and stores and provides the heat required to vaporize the liquid carbon dioxide in the vaporization component during the energy release process.

[0009] Preferably, the CO2 energy storage system utilizing external cold and heat sources further includes a transition tank connecting both the cold source utilization system and the heat source utilization system. The heat exchange medium output by the heat source utilization system, which releases heat in the vaporization component, and the heat exchange medium output by the cold source utilization system, which releases cold in the liquefaction component, are both input into the transition tank.

[0010] Preferably, the cold source utilization system includes a cold source utilization device and a liquefaction cold tank; the transition tank, the cold source utilization device, the liquefaction cold tank and the second liquefaction heat exchange path of the liquefaction component are connected in sequence to form a cold source utilization circuit.

[0011] Preferably, the heat source utilization system includes a heat source utilization device and a vaporization heat tank; the transition tank, the heat source utilization device, the vaporization heat tank and the second vaporization heat exchange path of the vaporization component are connected in sequence to form a heat source utilization loop.

[0012] Preferably, the cold source utilization system includes a cold source utilization device and a phase change cold storage device; two cold storage medium channels in the phase change cold storage device are connected to the liquefaction component and the cold source utilization device to form a circulation loop. The phase change cold storage device is filled with a phase change material.

[0013] Preferably, the heat source utilization system includes a heat source utilization device and a phase change heat accumulator; the two heat storage medium channels in the phase change heat accumulator are respectively connected to the vaporization component and the heat source utilization device to form a circulation loop; the phase change heat accumulator is filled with phase change material.

[0014] Preferably, the cold source utilization device adopts a cooling tower for converting the air cold source into cold energy.

[0015] Preferably, the heat source utilization device includes a photothermal component; the photothermal component is used to absorb heat energy and / or electrical energy in ambient light;

[0016] Preferably, the heat source utilization device further comprises a boiler; the electrical energy generated by the photothermal assembly is transmitted to the boiler, and the boiler generates heat when powered on.

[0017] Preferably, a throttle valve is provided between the energy storage low-pressure heat exchange component and the low-pressure carbon dioxide storage tank; during the energy storage process, the liquid carbon dioxide output from the low-pressure carbon dioxide storage tank has a reduced flow cross-sectional area when passing through the throttle valve and is converted into gas-liquid two-phase carbon dioxide; an on-off valve is provided between the energy release low-pressure heat exchange component and the low-pressure carbon dioxide storage tank.

[0018] Preferably, the energy storage low-pressure heat exchange component, the energy storage high-pressure heat exchange component, the energy release high-pressure heat exchange component and the energy release low-pressure heat exchange component each include one or multiple heat exchangers connected in sequence.

[0019] Preferably, the heat exchangers in the energy storage low-pressure heat exchange assembly correspond one-to-one with the heat exchangers in the energy release low-pressure heat exchange assembly, with a heat storage tank and a cold storage tank connected in parallel between the two corresponding heat exchangers, and connected to form a circulation loop via a heat exchange medium pipeline. The heat exchangers in the energy storage high-pressure heat exchange assembly correspond one-to-one with the heat exchangers in the energy release high-pressure heat exchange assembly, with a heat storage tank and a cold storage tank connected in parallel between the two corresponding heat exchangers, and connected to form a circulation loop via a heat exchange medium pipeline.

[0020] The beneficial effects of the utility model are:

[0021] 1. The present invention connects the second liquefaction heat exchange path of the liquefaction component with the cold source utilization system, and the second vaporization heat exchange path of the vaporization component with the heat source utilization system, so that the cold source utilization system and the heat source utilization system provide the liquefaction component and the vaporization component with the cold and heat required for liquefaction and vaporization of carbon dioxide; at the same time, the cold source utilization system and the heat source utilization system in the present invention store cold and heat by absorbing natural cold and heat sources, thereby reducing the cost of the energy storage and release process.

[0022] 2. The utility model can use the cold source utilization system and the heat source utilization system to store cold and heat of natural cold and heat sources in the interval between energy storage and energy release, and can operate for a long time to store heat when the natural cold and heat sources are relatively abundant, thereby effectively reducing the power of the cold source utilization device and the heat source utilization device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the overall structure of Example 1 of the present utility model.

[0024] Figure 2 This is a schematic diagram of the overall structure of Example 2 of the present utility model.

[0025] Figure numerals: 1. Low-pressure carbon dioxide storage tank; 2. Energy storage low-pressure heat exchanger; 3. Compressor; 4. Energy storage high-pressure heat exchange component; 5. Liquefaction component; 6. High-pressure carbon dioxide storage tank; 7. Vaporization component; 8. Energy release high-pressure heat exchange component; 9. Turbine; 10. Energy release low-pressure heat exchange component; 11. Throttle valve; 12. On-off valve; 13. Transition tank; 14. Cooling tower; 15. Liquefaction cold tank; 16. Photothermal component; 17. Boiler; 18. Vaporization heat tank; 19. Phase change cold accumulator; 20. Phase change heat accumulator. DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to the accompanying drawings.

[0027] Example 1

[0028] like Figure 1As shown, a carbon dioxide energy storage system based on the utilization of external cold and heat sources includes a cold source utilization system, a heat source utilization system, a transition tank 13, and a low-pressure carbon dioxide storage tank 1, a low-pressure energy storage heat exchange assembly 2, a compressor 3, a high-pressure energy storage heat exchange assembly 4, a liquefaction assembly 5, a high-pressure carbon dioxide storage tank 6, a vaporization assembly 7, a high-pressure energy release heat exchange assembly 8, a turbine 9, and a low-pressure energy release heat exchange assembly 10, which are sequentially connected to form an energy storage and release cycle. The low-pressure energy storage heat exchange assembly 2 is connected to the low-pressure carbon dioxide storage tank 1 via a throttle valve 11, which converts the liquid carbon dioxide output from the low-pressure carbon dioxide storage tank 1 into gas-liquid two-phase carbon dioxide. The liquefaction assembly 5 is provided with a first liquefaction heat exchange path and a second liquefaction heat exchange path. The vaporization assembly 7 is provided with a first vaporization heat exchange path and a second vaporization heat exchange path. The first liquefaction heat exchange path of the liquefaction assembly 5 and the first vaporization heat exchange path of the vaporization assembly 7 are connected to the energy storage and release cycle. The energy-releasing low-pressure heat exchange assembly 10 is connected to the low-pressure carbon dioxide storage tank 1 via an on-off valve 12. Both the energy-releasing low-pressure heat exchange assembly 10 and the energy-storing low-pressure heat exchange assembly 2 include two heat exchangers connected in series. The heat exchanger in the energy-releasing low-pressure heat exchange assembly 10 corresponds one-to-one to the heat exchanger in the energy-storing low-pressure heat exchange assembly 2. A heat storage tank and a cold storage tank are connected in parallel between the two corresponding heat exchangers, and the heat storage tank and the cold storage tank are connected to form a circulation loop via a heat exchange medium pipeline. The energy-storing high-pressure heat exchange assembly 4, the heat storage tank, the energy-releasing high-pressure heat exchange assembly 8, and the cold storage tank are sequentially connected to form a circulation loop via a heat exchange medium pipeline. The cold source utilization system includes a cold source utilization device and a liquefied cold tank 15; the heat source utilization system includes a heat source utilization device and a vaporized heat tank 18. The transition tank 13, the cold source utilization device, the liquefaction cold tank 15, and the second liquefaction heat exchange path of the liquefaction assembly 5 are sequentially connected to form a cold source utilization circuit. The transition tank 13, the heat source utilization device, the vaporization heat tank 18, and the second vaporization heat exchange path of the vaporization assembly 7 are sequentially connected to form a heat source utilization circuit. The cold source utilization system is connected to the second liquefaction heat exchange path of the liquefaction assembly 5, collecting ambient cold energy to replenish the liquefaction assembly 5; the heat source utilization system is connected to the second vaporization heat exchange path of the vaporization assembly 7, collecting ambient heat to provide to the vaporization assembly 7. The heat exchange medium output by the heat source utilization system that releases heat in the vaporization assembly 7 and the heat exchange medium output by the cold source utilization system that releases cold energy in the liquefaction assembly 5 are both input into the transition tank 13. The cold source utilization device uses a cooling tower 14 to convert air cooling energy into cold energy, which is then transferred to a heat transfer medium flowing through the cooling tower 14. The heat source utilization device includes a solar thermal module 16 and a boiler 17. The solar thermal module 16 absorbs solar thermal energy, converts it into heat and electricity, transfers the heat energy to the heat transfer medium, and supplies the electricity to the boiler 17 to generate heat energy. During operation, the energy storage system switches between energy storage and energy release.

[0029] In some embodiments, groundwater cooling energy, river, lake, and sea cooling energy, and geothermal energy are used to replace cold source utilization devices and heat source utilization devices to store cold and heat.

[0030] In the energy storage state, throttle valve 11 is open and on-off valve 12 is closed. Liquid carbon dioxide in low-pressure carbon dioxide storage tank 1, under the influence of a pressure differential, passes through open throttle valve 11 and, under the action of throttling and gasification, is converted into gaseous and liquid carbon dioxide, which then enters energy storage low-pressure heat exchange assembly 2. The two heat exchangers in energy storage low-pressure heat exchange assembly 2 exchange heat with the carbon dioxide through the heat transfer medium input from the corresponding heat storage tank, gradually increasing the temperature of the gaseous and liquid carbon dioxide in energy storage low-pressure heat exchange assembly 2 and outputting gaseous carbon dioxide. The heat transfer medium is then transported to the corresponding cold storage tank for storage. Compressor 3 consumes electrical energy to pressurize the gaseous carbon dioxide output from energy storage low-pressure heat exchange assembly 2, which is then input into energy storage high-pressure heat exchange assembly 4. The energy storage high-pressure heat exchange component 4 exchanges heat with the heat transfer medium input through the corresponding cold storage tank, so that the gaseous carbon dioxide is cooled in the energy storage high-pressure heat exchange component 4 and input into the liquefaction component 5, and the heat transfer medium is transported to the corresponding heat storage tank for storage; the liquefaction component 5 exchanges heat with the heat transfer medium input through the liquefaction cold tank 15, so that the temperature of the gaseous carbon dioxide is reduced and converted into liquid carbon dioxide, and transported to the high-pressure carbon dioxide storage tank 6 for storage, and the heat transfer medium is transported to the transition tank 13 for storage.

[0031] In the energy-releasing state, the throttle valve 11 is closed and the on-off valve 12 is opened; the liquid carbon dioxide in the high-pressure carbon dioxide storage tank 6 is input into the vaporization assembly 7; the vaporization assembly 7 exchanges heat with the liquid carbon dioxide through the heat transfer medium input from the vaporization heat tank 18, causing the liquid carbon dioxide to heat up and convert into gaseous carbon dioxide, which is then input into the energy-releasing high-pressure heat exchange assembly 8. The heat transfer medium is then transported to the transition tank 13 for storage. The energy-releasing high-pressure heat exchange assembly 8 exchanges heat with the carbon dioxide through the heat transfer medium input from the corresponding heat storage tank, causing the gaseous carbon dioxide to heat up in the energy-releasing high-pressure heat exchange assembly 8 and be input into the turbine 9. The heat transfer medium is then transported to the corresponding cold storage tank for storage; the turbine 9 performs work externally through the expansion of the gaseous carbon dioxide, releasing energy, and inputs the gaseous carbon dioxide into the energy-releasing low-pressure heat exchange assembly 10. The two heat exchangers in the energy-releasing low-pressure heat exchange component 10 exchange heat with carbon dioxide through the heat transfer medium input from the corresponding cold storage tank, so that the gaseous carbon dioxide is gradually cooled in the energy-releasing low-pressure heat exchange component 10, and liquid carbon dioxide is obtained and transported to the low-pressure carbon dioxide storage tank 1 for storage through the on-off valve 13, and the heat transfer medium is transported to the corresponding heat storage tank for storage.

[0032] Example 2

[0033] like Figure 2As shown, a carbon dioxide energy storage system based on the utilization of external cold and heat sources is shown. This embodiment differs from Example 1 in that: the cold source utilization system includes a cold source utilization device and a phase-change cold accumulator 19; the heat source utilization system includes a heat source utilization device and a phase-change heat accumulator 20; both phase-change cold accumulator 19 and phase-change heat accumulator 20 are filled with phase-change material, whose phase transition point matches the critical temperature of carbon dioxide. The two cold storage medium channels in phase-change cold accumulator 19 are connected to the liquefaction component 5 and the cold source utilization device, respectively, to form a circulation loop; the two heat storage medium channels in phase-change heat accumulator 20 are connected to the vaporization component 7 and the heat source utilization device, respectively, to form a circulation loop. Phase-change cold accumulator 19 collects ambient cold energy through the cold source utilization device and stores it in the phase-change material, providing cold energy for the liquefaction of carbon dioxide in the liquefaction component 5; phase-change heat accumulator 20 collects ambient heat through the heat source utilization device and stores it in the phase-change material, providing heat for the vaporization of carbon dioxide in the vaporization component 7.

[0034] During operation, the energy storage system switches between an energy storage state and an energy release state.

[0035] In the energy storage state, throttle valve 11 is open and on-off valve 12 is closed. Liquid carbon dioxide in low-pressure carbon dioxide storage tank 1, under the influence of a pressure differential, passes through open throttle valve 11 and, under the action of throttling and gasification, is converted into gaseous and liquid carbon dioxide, which then enters energy storage low-pressure heat exchange assembly 2. The two heat exchangers in energy storage low-pressure heat exchange assembly 2 exchange heat with the carbon dioxide through the heat transfer medium input from the corresponding heat storage tank, gradually increasing the temperature of the gaseous and liquid carbon dioxide in energy storage low-pressure heat exchange assembly 2 and outputting gaseous carbon dioxide. The heat transfer medium is then transported to the corresponding cold storage tank for storage. Compressor 3 consumes electrical energy to pressurize the gaseous carbon dioxide output from energy storage low-pressure heat exchange assembly 2, which is then input into energy storage high-pressure heat exchange assembly 4. The energy storage high-pressure heat exchange component 4 exchanges heat with the gaseous carbon dioxide through the heat transfer medium input from the corresponding cold storage tank, so that the gaseous carbon dioxide is cooled in the energy storage high-pressure heat exchange component 4 and input into the liquefaction component 5, and the heat transfer medium is transported to the corresponding heat storage tank for storage; the gaseous carbon dioxide in the liquefaction component 5 exchanges heat with the phase change material in the phase change cold accumulator 19 through the heat transfer medium, so that the temperature of the gaseous carbon dioxide is reduced and converted into liquid carbon dioxide, which is transported to the high-pressure carbon dioxide storage tank 6 for storage.

[0036] In the energy-releasing state, throttle valve 11 is closed and on-off valve 12 is opened; liquid carbon dioxide from high-pressure carbon dioxide storage tank 6 is fed into vaporizer assembly 7; the liquid carbon dioxide in vaporizer assembly 7 exchanges heat with the phase-change material in phase-change heat accumulator 20 via a heat transfer medium, raising the temperature of the liquid carbon dioxide and converting it into gaseous carbon dioxide, which is then fed into energy-releasing high-pressure heat exchange assembly 8. Energy-releasing high-pressure heat exchange assembly 8 exchanges heat with carbon dioxide via the heat transfer medium fed from the corresponding heat storage tank, causing the gaseous carbon dioxide to heat up in energy-releasing high-pressure heat exchange assembly 8 and be fed into turbine 9. The heat transfer medium is then transported to the corresponding cold storage tank for storage; turbine 9 performs external work through the expansion of the gaseous carbon dioxide, releasing energy, and feeding the gaseous carbon dioxide into energy-releasing low-pressure heat exchange assembly 10. The two heat exchangers in the energy-releasing low-pressure heat exchange component 10 exchange heat with carbon dioxide through the heat transfer medium input from the corresponding cold storage tank, so that the gaseous carbon dioxide is gradually cooled in the energy-releasing low-pressure heat exchange component 10, and liquid carbon dioxide is obtained and transported to the low-pressure carbon dioxide storage tank 1 for storage through the on-off valve 13, and the heat transfer medium is transported to the corresponding heat storage tank for storage.

Claims

1. A carbon dioxide energy storage system based on the utilization of external cold and heat sources, comprising a cold source utilization system, a heat source utilization system, and a low-pressure carbon dioxide storage tank (1), an energy storage low-pressure heat exchange component (2), a compressor (3), an energy storage high-pressure heat exchange component (4), a liquefaction component (5), a high-pressure carbon dioxide storage tank (6), a vaporization component (7), an energy release high-pressure heat exchange component (8), a turbine (9), and an energy release low-pressure heat exchange component (10) which are sequentially connected to form an energy storage and release circulation loop; Its characteristics are: The liquefaction component (5) is provided with a first liquefaction heat exchange path and a second liquefaction heat exchange path; the vaporization component (7) is provided with a first vaporization heat exchange path and a second vaporization heat exchange path; the first liquefaction heat exchange path of the liquefaction component (5) and the first vaporization heat exchange path of the vaporization component (7) are connected to the energy storage and release circulation loop; the cold source utilization system is connected to the second liquefaction heat exchange path of the liquefaction component (5) to collect ambient cold energy and supply it to the liquefaction component (5); the heat source utilization system is connected to the second vaporization heat exchange path of the vaporization component (7) to collect ambient heat and provide it to the vaporization component (7).

2. The carbon dioxide energy storage system based on the utilization of external cold and heat sources according to claim 1, characterized in that: The carbon dioxide energy storage system based on the utilization of external cold and heat sources also includes a transition tank (13) that is connected to the cold source utilization system and the heat source utilization system at the same time; the heat exchange medium output by the heat source utilization system that releases heat in the vaporization component (7) and the heat exchange medium output by the cold source utilization system that releases cold in the liquefaction component (5) are both input into the transition tank (13).

3. The carbon dioxide energy storage system based on the utilization of external cold and heat sources according to claim 1, characterized in that: The cold source utilization system includes a cold source utilization device and a liquefaction cold tank (15); the transition tank (13), the cold source utilization device, the liquefaction cold tank (15) and the second liquefaction heat exchange path of the liquefaction component (5) are connected in sequence to form a cold source utilization loop; the heat source utilization system includes a heat source utilization device and a vaporization heat tank (18); the transition tank (13), the heat source utilization device, the vaporization heat tank (18) and the second vaporization heat exchange path of the vaporization component (7) are connected in sequence to form a heat source utilization loop.

4. The carbon dioxide energy storage system based on the utilization of external cold and heat sources according to claim 3, characterized in that: The cold source utilization device adopts a cooling tower (14); the heat source utilization device includes a photothermal component (16).

5. The carbon dioxide energy storage system based on the utilization of external cold and heat sources according to claim 4, characterized in that: The heat source utilization device further includes a boiler (17); the electrical energy generated by the photothermal component (16) is transmitted to the boiler (17).

6. The carbon dioxide energy storage system based on the utilization of external cold and heat sources according to claim 1, characterized in that: The cold source utilization system comprises a cold source utilization device and a phase change cold storage device (19); two cold storage medium channels in the phase change cold storage device (19) are respectively connected to the liquefaction component (5) and the cold source utilization device to form a circulation loop; and the phase change cold storage device (19) is filled with phase change material.

7. The carbon dioxide energy storage system based on the utilization of external cold and heat sources according to claim 1, characterized in that: The heat source utilization system comprises a heat source utilization device and a phase change heat accumulator (20); two heat storage medium channels in the phase change heat accumulator (20) are respectively connected to the vaporization component (7) and the heat source utilization device to form a circulation loop; and the phase change heat accumulator (20) is filled with phase change material.

8. The carbon dioxide energy storage system based on the utilization of external cold and heat sources according to claim 1, characterized in that: A throttle valve (11) is provided between the energy storage low-pressure heat exchange component (2) and the low-pressure carbon dioxide storage tank (1); and an on-off valve (12) is provided between the energy release low-pressure heat exchange component (10) and the low-pressure carbon dioxide storage tank (1).

9. The carbon dioxide energy storage system based on the utilization of external cold and heat sources according to claim 1, characterized in that: The energy storage low-pressure heat exchange component (2), the energy storage high-pressure heat exchange component (4), the energy release high-pressure heat exchange component (8), and the energy release low-pressure heat exchange component (10) each include one or multiple heat exchangers connected in sequence.

10. The carbon dioxide energy storage system based on the utilization of external cold and heat sources according to claim 1, characterized in that: The energy storage low-pressure heat exchange assembly (2) corresponds to the heat exchanger in the energy release low-pressure heat exchange assembly (10) on a one-to-one basis, and a heat storage tank and a cold storage tank are connected in parallel between the two corresponding heat exchangers, and are connected to form a circulation loop through a heat exchange medium pipeline; the energy storage high-pressure heat exchange assembly (4) corresponds to the heat exchanger in the energy release high-pressure heat exchange assembly (8) on a one-to-one basis, and a heat storage tank and a cold storage tank are connected in parallel between the two corresponding heat exchangers, and are connected to form a circulation loop through a heat exchange medium pipeline.

Images