A multimodal energy storage power station system

Abstract

This invention provides a multimodal energy storage power station system, including a compressed air energy storage system, a high-temperature heat pump system, and a supercritical carbon dioxide power generation system. The compressed air energy storage system includes a multimodal heat exchange subsystem, a first energy storage subsystem, and a first power generation system connected in sequence. The multimodal heat exchange subsystem includes a front-end heat exchange subsystem and a rear-end heat exchange subsystem connected in sequence. The high-temperature heat pump system includes an expander, a first heat exchanger, a compressor, a second heat exchanger, a first drive motor coaxially connected to the expander, and a second drive motor coaxially connected to the compressor. The supercritical carbon dioxide power generation system includes a second energy storage subsystem, a third heat exchanger, and a second power generation system connected in sequence. The front-end heat exchange subsystem is coupled with the first heat exchanger for heat exchange, and the second heat exchanger is coupled with the second energy storage subsystem for heat exchange. This technical solution can solve the problems of low energy storage efficiency and slow response speed of existing compressed air energy storage technology.

Description

Technical Field

[0001] This utility model relates to the field of independent energy storage power station technology, specifically to a multimodal energy storage power station system. Background Technology

[0002] Because wind and solar power are heavily influenced by the environment and weather, they are intermittent and unstable power sources. Large-scale deployment with rapid and deep load regulation capabilities is the prerequisite and foundation for ensuring large-scale wind and solar power grid connection.

[0003] The core challenge in transforming the power system from one based on thermal power plants to one heavily reliant on renewable energy generation is the ever-increasing demand for flexibility. Maintaining high power supply security at a reasonable cost while addressing the uncertainty and variability of power generation is a crucial problem that must be solved in building a new power system. Energy storage power stations play a role in peak shaving and valley filling for grid operation. Specifically, energy storage power stations can track the load curve of the local grid, absorbing power and energy from the grid during periods of low load and releasing the stored power during periods of high load, thus reducing grid losses and improving the economic efficiency of grid operation.

[0004] Compressed air energy storage technology has a large energy storage capacity, long storage time, and can provide rotational inertia support for the power grid. It is increasingly attracting the attention of the power industry. The main purpose of compressed air energy storage system is to use off-peak electricity from the power grid to drive a compressor to compress air, convert electrical energy into compressed air energy and store it in an artificial chamber to complete the energy storage process.

[0005] Existing compressed air energy storage technologies require the use of underground salt caverns or the construction of large-scale artificial chambers, resulting in stringent site selection requirements and persistently high construction costs. Furthermore, existing compressed air energy storage systems suffer from low waste heat utilization during energy conversion, leading to an electro-electricity conversion efficiency of only 50%-70%. Significant energy losses occur during conversion, and the slow response speed of the air expansion turbine fails to meet grid frequency regulation requirements. Utility Model Content

[0006] The purpose of this invention is to provide a multimodal energy storage power station system to solve the problems of low energy storage efficiency and slow response speed of existing compressed air energy storage technology.

[0007] To address the aforementioned issues, this utility model provides a multimodal energy storage power station system, comprising a compressed air energy storage system, a high-temperature heat pump system, and a supercritical carbon dioxide power generation system; The compressed air energy storage system includes a multimodal heat exchange subsystem, a first energy storage subsystem, and a first power generation system connected in sequence; the multimodal heat exchange subsystem includes a front-end heat exchange subsystem and a rear-end heat exchange subsystem connected in sequence to achieve staged heat exchange; The high-temperature heat pump system includes an expander, a first heat exchanger, a compressor, a second heat exchanger, a first drive motor coaxially connected to the expander, and a second drive motor coaxially connected to the compressor; the expander, the first heat exchanger, the compressor, and the second heat exchanger are connected in sequence, and the second heat exchanger is also connected to the expander, so that the circulating medium is recycled within the high-temperature heat pump system; the first drive motor and the second drive motor may be the same drive motor or different drive motors; The supercritical carbon dioxide power generation system includes a second energy storage subsystem, a third heat exchanger, and a second power generation system connected in sequence. The front-end heat exchange subsystem is coupled with the first heat exchanger to transfer heat energy from the compressed air energy storage system to the high-temperature heat pump system; the second heat exchanger is coupled with the second energy storage subsystem to transfer heat energy from the high-temperature heat pump system to the supercritical carbon dioxide power generation system.

[0008] Furthermore, the heat exchange unit in the front-end heat exchange subsystem has at least one stage, and the heat exchange unit in the rear-end heat exchange subsystem has one stage; the heat exchange units in the front-end heat exchange subsystem and the heat exchange units in the rear-end heat exchange subsystem have different structures to achieve multimodal staged heat exchange.

[0009] Furthermore, the heat exchange unit in the front-end heat exchange subsystem has two stages, including a first-stage heat exchange unit and a second-stage heat exchange unit. The first-stage heat exchange unit includes a compressor, a drive motor, an air heat exchanger, and a heat exchanger. The second-stage heat exchange unit includes a compressor, a drive motor, an air heat exchanger, and a heat exchanger. The back-end heat exchange subsystem includes a tertiary heat exchange unit, which includes a compressor, a drive motor, and a heat exchanger. The first-stage drive motor, the second-stage drive motor, and the third-stage drive motor may be the same motor or different motors. The first energy storage subsystem includes a first high-temperature medium storage tank, a first low-temperature medium storage tank, and a gas storage tank. The first-stage compressor is coaxially connected to the first-stage drive motor; the input end of the first-stage compressor is open to the atmosphere, and the output end is connected to the first air input end of the first-stage air heat exchanger; the first air output end of the first-stage air heat exchanger is connected to the air input end of the first-stage heat exchanger, the second air input end is connected to the first air output end of the first heat exchanger, and the second air output end is connected to the first air input end of the first heat exchanger; the air output end of the first-stage heat exchanger is connected to the input end of the second-stage compressor, the low-temperature medium input end is connected to the first output end of the first low-temperature medium storage tank, and the high-temperature medium output end is connected to the first input end of the first high-temperature medium storage tank; The two-stage compressor is coaxially connected to the two-stage drive motor; the output end of the two-stage compressor is connected to the first air input end of the two-stage air heat exchanger; the first air output end of the two-stage air heat exchanger is connected to the air input end of the two-stage air heat exchanger, the second air input end is connected to the second air output end of the first heat exchanger, and the second air output end is connected to the second air input end of the first heat exchanger; the air output end of the two-stage heat exchanger is connected to the input end of the three-stage compressor, the low-temperature medium input end is connected to the second output end of the first low-temperature medium storage tank, and the high-temperature medium output end is connected to the second input end of the first high-temperature medium storage tank; The three-stage compressor is coaxially connected to the three-stage drive motor; the output end of the three-stage compressor is connected to the air input end of the three-stage heat exchanger; the air output end of the three-stage heat exchanger is connected to the input end of the gas storage tank; the low-temperature medium input end is connected to the third output end of the first low-temperature medium storage tank; and the high-temperature medium output end is connected to the third input end of the first high-temperature medium storage tank. The gas storage tank, the first high-temperature medium storage tank, and the first low-temperature medium storage tank are respectively connected to the first electronic system.

[0010] Furthermore, the first power generation system includes a high-pressure air power generation unit and a low-pressure air power generation unit; the high-pressure air power generation unit includes a primary heater, a first generator set, and a high-pressure air turbine, and the low-pressure air power generation unit includes a secondary heater, a second generator set, and a low-pressure air turbine; the first generator set and the second generator set may be the same generator set or different generator sets; The first generator set is coaxially connected to the high-pressure air turbine; the output end of the gas storage tank is connected to the air input end of the first-stage heater, the air output end of the first-stage heater is connected to the air input end of the high-pressure air turbine, the air output end of the high-pressure air turbine is connected to the air input end of the second-stage heater, the air output end of the second-stage heater is connected to the air input end of the low-pressure air turbine, and the air output end of the low-pressure air turbine is connected to the atmosphere; the high-temperature medium input end of the first-stage heater is connected to the first output end of the first high-temperature medium storage tank, and the low-temperature medium output end is connected to the first input end of the first low-temperature medium storage tank; the high-temperature medium input end of the second-stage heater is connected to the second output end of the first high-temperature medium storage tank, and the low-temperature medium output end is connected to the second input end of the first low-temperature medium storage tank.

[0011] Furthermore, the first high-temperature medium storage tank stores high-temperature water, and the first low-temperature medium storage tank stores low-temperature water.

[0012] Furthermore, the circulating medium is a gaseous medium.

[0013] Furthermore, the second energy storage subsystem and the second power generation system are coupled and exchange heat through the third heat exchanger to realize the transfer of thermal energy from the second energy storage subsystem to the second power generation system; The second electronic system includes a supercritical carbon dioxide turbine, a generator, a carbon dioxide compressor unit, a regenerator unit, and a precooler; the supercritical carbon dioxide turbine and the carbon dioxide compressor unit are coaxially connected to the generator; the input end of the supercritical carbon dioxide turbine is connected to the carbon dioxide output end of the third heat exchanger, the output end is connected to the hot-side inlet of the regenerator unit, the hot-side outlet of the regenerator unit is connected to the input end of the precooler, the output end of the precooler is connected to the input end of the carbon dioxide compressor unit, the output end of the carbon dioxide compressor unit is connected to the cold-side inlet of the regenerator unit, and the cold-side outlet of the regenerator unit is connected to the carbon dioxide input end of the third heat exchanger; The carbon dioxide compressor unit includes at least one carbon dioxide compressor, and the regenerator unit includes at least one regenerator.

[0014] Furthermore, the carbon dioxide compressor unit includes a main carbon dioxide compressor and a carbon dioxide re-compressor, the main carbon dioxide compressor and the carbon dioxide re-compressor being coaxially connected to the generator respectively; the regenerator unit includes a high-temperature regenerator and a low-temperature regenerator; The output end of the supercritical carbon dioxide turbine is connected to the hot-side inlet of the high-temperature regenerator; the hot-side outlet of the high-temperature regenerator is connected to the hot-side inlet of the low-temperature regenerator; the first hot-side outlet of the low-temperature regenerator is connected to the input end of the precooler; the output end of the precooler is connected to the input end of the carbon dioxide main compressor; the output end of the carbon dioxide main compressor is connected to the cold-side inlet of the low-temperature regenerator; the cold-side outlet of the low-temperature regenerator is connected to the first cold-side inlet of the high-temperature regenerator; the second hot-side outlet of the low-temperature regenerator is connected to the input end of the carbon dioxide recompressor; the output end of the carbon dioxide recompressor is connected to the second cold-side inlet of the high-temperature regenerator; and the cold-side outlet of the high-temperature regenerator is connected to the carbon dioxide input end of the third heat exchanger.

[0015] Furthermore, the second energy storage subsystem includes a second high-temperature medium storage tank and a second low-temperature medium storage tank; the input end of the second high-temperature medium storage tank is connected to the high-temperature medium output end of the second heat exchanger, and the output end is connected to the high-temperature medium input end of the third heat exchanger; the input end of the second low-temperature medium storage tank is connected to the low-temperature medium output end of the third heat exchanger, and the output end is connected to the low-temperature medium input end of the second heat exchanger.

[0016] Furthermore, the energy storage medium used in the second energy storage subsystem is molten salt.

[0017] Compared with the prior art, the present invention has the following beneficial effects: This invention provides a multimodal energy storage power station system suitable for independent energy storage power stations. It comprises a compressed air energy storage system, a high-temperature heat pump system, and a supercritical carbon dioxide power generation system to achieve flexible multimodal energy storage. During the energy storage phase, the high-temperature heat pump system reheats the high-temperature air discharged from the compressor outlet of the compressed air energy storage system, improving its energy quality and storing the high-grade heat in molten salt. In this process, the high-temperature heat pump system uses a heat pump-driven motor to achieve a reverse Carnot cycle, simultaneously storing electrical energy as heat in the molten salt. This simultaneously improves the heat quality of the compressed air energy storage system and stores electrical energy, thus enhancing the system's electro-electric conversion efficiency. During the energy release phase, the system can adopt a compressed air energy storage system power generation mode, a supercritical carbon dioxide power generation mode, or a combined compressed air energy storage system and supercritical carbon dioxide power generation mode according to grid dispatch instructions, improving the system's operational flexibility. Because the supercritical carbon dioxide power generation system has a faster response speed than the compressed air energy storage system, it can meet the grid frequency regulation requirements and has the advantages of high system flexibility and strong grid support. Attached Figure Description

[0018] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a structural schematic diagram of a multimodal energy storage power station system provided for an embodiment of the present invention.

[0019] In the picture: 100. Compressed air energy storage system; 101. First-stage compressor; 102. First-stage drive motor; 103. First-stage high-temperature gas heat exchanger; 104. First-stage gas-water heat exchanger; 105. Second-stage compressor; 106. Second-stage drive motor; 107. Second-stage high-temperature gas heat exchanger; 108. Second-stage gas-water heat exchanger; 109. Third-stage compressor; 110. Third-stage drive motor; 111. Third-stage gas-water heat exchanger; 112. Low-temperature water storage tank; 113. High-temperature water storage tank; 114. Low-pressure air turbine; 115. Second-stage gas-water heater; 116. High-pressure air turbine; 117. Air expander generator; 118. First-stage gas-water heater; 119. Gas storage tank; 200. High-temperature heat pump system; 201. Gas expander; 202. Heat pump drive motor; 203. Gas-to-gas heat exchanger; 204. High-temperature gas compressor; 205. Molten salt gas heat exchanger; 300. Supercritical carbon dioxide power generation system; 301. High-temperature molten salt storage tank; 302. Low-temperature molten salt storage tank; 303. Molten salt carbon dioxide heat exchanger; 304. Supercritical carbon dioxide turbine; 305. Generator; 306. Carbon dioxide recompressor; 307. High-temperature regenerator; 308. Low-temperature regenerator; 309. Precooler; 310. Main carbon dioxide compressor. Detailed Implementation

[0020] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0021] Example: Please see Figure 1 The present invention provides a multimodal energy storage power station system, including a compressed air energy storage system 100, a high-temperature heat pump system 200, and a supercritical carbon dioxide power generation system 300; The compressed air energy storage system 100 includes a multi-modal heat exchange subsystem, a first energy storage subsystem, and a first power generation system connected in sequence; the multi-modal heat exchange subsystem includes a front-end heat exchange subsystem and a rear-end heat exchange subsystem connected in sequence to achieve staged heat exchange; The high-temperature heat pump system 200 includes an expander, a first heat exchanger, a compressor, a second heat exchanger, a first drive motor coaxially connected to the expander, and a second drive motor coaxially connected to the compressor; the expander, the first heat exchanger, the compressor, and the second heat exchanger are connected in sequence, and the second heat exchanger is also connected to the expander, so that the circulating medium can be recycled within the high-temperature heat pump system 200; the first drive motor and the second drive motor may be the same drive motor or different drive motors; The supercritical carbon dioxide power generation system 300 adopts a recompression Brayton cycle and includes a second energy storage subsystem, a third heat exchanger, and a second power generation system connected in sequence. The second energy storage subsystem and the second power generation system are coupled and exchange heat through the third heat exchanger to transfer thermal energy from the second energy storage subsystem to the second power generation system. The second power generation system includes a supercritical carbon dioxide turbine 304, a generator 305, a carbon dioxide compressor unit, a regenerator unit, and a precooler 309. The supercritical carbon dioxide turbine 304 and the carbon dioxide compressor unit are coaxially connected to the generator 305. The input end of the supercritical carbon dioxide turbine 304 is connected to the carbon dioxide output end of the third heat exchanger, and the output end is connected to the hot-side inlet of the regenerator unit. The hot-side outlet of the regenerator unit is connected to the input end of the precooler 309, the output end of the precooler 309 is connected to the input end of the carbon dioxide compressor unit, the output end of the carbon dioxide compressor unit is connected to the cold-side inlet of the regenerator unit, and the cold-side outlet of the regenerator unit is connected to the carbon dioxide input end of the third heat exchanger. The front-end heat exchange subsystem is coupled with the first heat exchanger to transfer heat energy from the compressed air energy storage system 100 to the high-temperature heat pump system 200; the second heat exchanger is coupled with the second energy storage subsystem to transfer heat energy from the high-temperature heat pump system 200 to the supercritical carbon dioxide power generation system 300. The heat exchange unit in the front heat exchange subsystem has at least one stage, and the heat exchange unit in the back heat exchange subsystem has one stage. The heat exchange units in the front heat exchange subsystem and the heat exchange units in the back heat exchange subsystem have different structures to achieve multimodal staged heat exchange. The carbon dioxide compressor unit includes at least one carbon dioxide compressor, and the regenerator unit includes at least one regenerator.

[0022] In one specific embodiment, the multimodal energy storage power station system includes a compressed air energy storage system 100, a high-temperature heat pump system 200, and a supercritical carbon dioxide power generation system 300. The compressed air energy storage system 100 includes a multi-modal heat exchange subsystem, a first energy storage subsystem, and a first power generation system connected in sequence; the multi-modal heat exchange subsystem includes a front-end heat exchange subsystem and a rear-end heat exchange subsystem connected in sequence to achieve staged heat exchange; The high-temperature heat pump system 200 includes an expander, a first heat exchanger, a compressor, a second heat exchanger, a first drive motor coaxially connected to the expander, and a second drive motor coaxially connected to the compressor; the expander, the first heat exchanger, the compressor, and the second heat exchanger are connected in sequence, and the second heat exchanger is also connected to the expander, so that the circulating medium can be recycled within the high-temperature heat pump system 200; the first drive motor and the second drive motor may be the same drive motor or different drive motors; The supercritical carbon dioxide power generation system 300 includes a second energy storage subsystem, a third heat exchanger, and a second power generation system connected in sequence. The second energy storage subsystem and the second power generation system are coupled and exchange heat through the third heat exchanger to realize the transfer of thermal energy from the second energy storage subsystem to the second power generation system. The front-end heat exchange subsystem is coupled with the first heat exchanger to transfer heat energy from the compressed air energy storage system 100 to the high-temperature heat pump system 200; the second heat exchanger is coupled with the second energy storage subsystem to transfer heat energy from the high-temperature heat pump system 200 to the supercritical carbon dioxide power generation system 300. The front-end heat exchange subsystem has two stages of heat exchange units, including a primary heat exchange unit and a secondary heat exchange unit. The primary heat exchange unit includes a primary compressor 101, a primary drive motor 102, a primary air heat exchanger, and a primary heat exchanger. The secondary heat exchange unit includes a secondary compressor 105, a secondary drive motor 106, a secondary air heat exchanger, and a secondary heat exchanger. The rear-end heat exchange subsystem includes a tertiary heat exchange unit, which includes a tertiary compressor 109, a tertiary drive motor 110, and a tertiary heat exchanger. The primary drive motor 102, the secondary drive motor 106, and the tertiary drive motor 110 may be the same drive motor or different drive motors. The first energy storage subsystem includes a first high-temperature medium storage tank, a first low-temperature medium storage tank, and a gas storage facility 119; The first power generation system includes a high-pressure air power generation unit and a low-pressure air power generation unit; the high-pressure air power generation unit includes a primary heater, a first generator set and a high-pressure air turbine 116, and the low-pressure air power generation unit includes a secondary heater, a second generator set and a low-pressure air turbine 114; the first generator set and the second generator set may be the same generator set or different generator sets. A first-stage compressor 101 is coaxially connected to a first-stage drive motor 102; the input end of the first-stage compressor 101 is open to the atmosphere, and its output end is connected to the first air input end of the first-stage air heat exchanger; the first air output end of the first-stage air heat exchanger is connected to the air input end of the first-stage heat exchanger, the second air input end is connected to the first air output end of the first heat exchanger, and the second air output end is connected to the first air input end of the first heat exchanger; the air output end of the first-stage heat exchanger is connected to the input end of the second-stage compressor 105, the low-temperature medium input end is connected to the first output end of the first low-temperature medium storage tank, and the high-temperature medium output end is connected to the first input end of the first high-temperature medium storage tank; The second-stage compressor 105 is coaxially connected to the second-stage drive motor 106; the output end of the second-stage compressor 105 is connected to the first air input end of the second-stage air heat exchanger; the first air output end of the second-stage air heat exchanger is connected to the air input end of the second-stage air heat exchanger, the second air input end is connected to the second air output end of the first heat exchanger, and the second air output end is connected to the second air input end of the first heat exchanger; the air output end of the second-stage heat exchanger is connected to the input end of the third-stage compressor 109, the low-temperature medium input end is connected to the second output end of the first low-temperature medium storage tank, and the high-temperature medium output end is connected to the second input end of the first high-temperature medium storage tank; The three-stage compressor 109 is coaxially connected to the three-stage drive motor 110; the output end of the three-stage compressor 109 is connected to the air input end of the three-stage heat exchanger; the air output end of the three-stage heat exchanger is connected to the input end of the gas storage tank 119; the low-temperature medium input end is connected to the third output end of the first low-temperature medium storage tank; and the high-temperature medium output end is connected to the third input end of the first high-temperature medium storage tank. The first generator set is coaxially connected to the high-pressure air turbine 116; the output end of the gas storage tank 119 is connected to the air input end of the first-stage heater, the air output end of the first-stage heater is connected to the air input end of the high-pressure air turbine 116, the air output end of the high-pressure air turbine 116 is connected to the air input end of the second-stage heater, the air output end of the second-stage heater is connected to the air input end of the low-pressure air turbine 114, and the air output end of the low-pressure air turbine 114 is open to the atmosphere; the high-temperature medium input end of the first-stage heater is connected to the first output end of the first high-temperature medium storage tank, and the low-temperature medium output end is connected to the first input end of the first low-temperature medium storage tank; the high-temperature medium input end of the second-stage heater is connected to the second output end of the first high-temperature medium storage tank, and the low-temperature medium output end is connected to the second input end of the first low-temperature medium storage tank. The second energy storage subsystem includes a second high-temperature medium storage tank and a second low-temperature medium storage tank; the input end of the second high-temperature medium storage tank is connected to the high-temperature medium output end of the second heat exchanger, and the output end is connected to the high-temperature medium input end of the third heat exchanger; the input end of the second low-temperature medium storage tank is connected to the low-temperature medium output end of the third heat exchanger, and the output end is connected to the low-temperature medium input end of the second heat exchanger. The second power generation system includes a supercritical carbon dioxide turbine 304, a generator 305, a carbon dioxide compressor unit, a regenerator unit, and a precooler 309; the carbon dioxide compressor unit includes a main carbon dioxide compressor 310 and a re-compressor 306, and the supercritical carbon dioxide turbine 304, the main carbon dioxide compressor 310, and the re-compressor 306 are coaxially connected to the generator 305; the regenerator unit includes a high-temperature regenerator 307 and a low-temperature regenerator 308. The output end of the supercritical carbon dioxide turbine 304 is connected to the hot-side inlet of the high-temperature regenerator 307, the hot-side outlet of the high-temperature regenerator 307 is connected to the hot-side inlet of the low-temperature regenerator 308, the first hot-side outlet of the low-temperature regenerator 308 is connected to the input end of the precooler 309, the output end of the precooler 309 is connected to the input end of the carbon dioxide main compressor 310, the output end of the carbon dioxide main compressor 310 is connected to the cold-side inlet of the low-temperature regenerator 308, the cold-side outlet of the low-temperature regenerator 308 is connected to the first cold-side inlet of the high-temperature regenerator 307; the second hot-side outlet of the low-temperature regenerator 308 is connected to the input end of the carbon dioxide recompressor 306, the output end of the carbon dioxide recompressor 306 is connected to the second cold-side inlet of the high-temperature regenerator 307, and the cold-side outlet of the high-temperature regenerator 307 is connected to the carbon dioxide input end of the third heat exchanger. In this configuration, the first air inlet and the second air inlet of the first heat exchanger are different branches or different inlets of the same inlet; the first air outlet and the second air outlet of the first heat exchanger are different branches or different outlets of the same outlet; the first inlet and the second inlet of the first low-temperature medium storage tank are different branches or different inlets of the same inlet, and the first outlet, the second outlet, and the third outlet are different branches or different outlets of the same outlet; the first inlet, the second inlet, and the third inlet of the first high-temperature medium storage tank are different branches or different inlets of the same inlet, and the first outlet and the second outlet are different branches or different outlets of the same outlet; the first hot-side outlet and the second hot-side outlet of the low-temperature regenerator 308 are different branches or different hot-side outlets of the same hot-side outlet; and the first cold-side inlet and the second cold-side inlet of the high-temperature regenerator 307 are different branches or different cold-side inlets of the same cold-side inlet.

[0023] In an optional embodiment, the first high-temperature medium storage tank stores high-temperature water, the first low-temperature medium storage tank stores low-temperature water, and the circulating medium is a gaseous medium, which can be any one of hydrofluoroolefins (HFOs), hydrofluorocarbons (HFCs), carbon dioxide, ammonia, propane, etc. The energy storage medium used in the second energy storage subsystem is molten salt. In this case, the first-stage air heat exchanger is a first-stage high-temperature gas heat exchanger 103, the first-stage heat exchanger is a first-stage gas-water heat exchanger 104, and the second-stage air heat exchanger is a second-stage high-temperature gas heat exchanger. 107. The secondary heat exchanger is a secondary gas-water heat exchanger 108, and the tertiary heat exchanger is a tertiary gas-water heat exchanger 111. The first-stage drive motor 102, the second-stage drive motor 106, and the third-stage drive motor 110 use different drive motors. The first generator set and the second generator set are the same generator set, using an air expander generator 117. The primary heater is a primary gas-water heater 118, and the secondary heater is a secondary gas-water heater 115. The first cryogenic medium storage tank is a cryogenic water storage tank 112, and the first high-temperature medium storage tank... A high-temperature water storage tank 113 is used; the first and second drive motors are the same, using a heat pump drive motor 202; the expander is a gas expander 201; the first heat exchanger is a gas-to-gas heat exchanger 203; the compressor is a high-temperature gas compressor 204; the second heat exchanger is a molten salt gas heat exchanger 205; the second high-temperature medium storage tank is a high-temperature molten salt storage tank 301; the second low-temperature medium storage tank is a low-temperature molten salt storage tank 302; and the third heat exchanger is a molten salt carbon dioxide heat exchanger 303; all structures are connected by pipelines. Connections; the working pressure of the compressed air energy storage system 100 is 4MPa-16MPa, the air temperature output by the first stage compressor 101 and the second stage compressor 105 is 150℃-350℃, and the air temperature output by the third stage compressor 109 is 80℃-200℃; the outlet temperature of the high temperature gas compressor 204 in the high temperature heat pump system 200 is 200℃-600℃; the operating temperature of the high temperature molten salt storage tank 301 is 380℃-580℃, and the operating temperature of the low temperature molten salt storage tank 302 is 180℃-400℃.

[0024] The actual operation process of the multimodal energy storage power station system provided in this embodiment is as follows: During the energy storage phase, the compressed air energy storage system 100 is put into operation. The air working medium from the atmosphere is compressed and pressurized by the first-stage compressor 101, and then enters the second-stage compressor 105 after heat exchange in the first-stage high-temperature gas heat exchanger 103 and the first-stage gas-water heat exchanger 104. After the air working medium is compressed and pressurized in the second stage, it enters the third-stage compressor 109 after the second-stage high-temperature gas heat exchanger 107 and the second-stage gas-water heat exchanger 108. After the air working medium is compressed in the third stage and reaches the design pressure, it enters the third-stage gas-water heat exchanger 111 to reduce its temperature before going to the gas storage tank 119 for storage. The high-temperature air generated during the compression process of the first-stage compressor 101 and the second-stage compressor 105 exchanges heat with the low-temperature gas discharged from the gas expander 201 in the gas-to-gas heat exchanger 203 through the first-stage high-temperature gas heat exchanger 103 and the second-stage high-temperature gas heat exchanger 107, transferring heat to the gas medium of the high-temperature heat pump system. The heat pump drive motor 202 drives the high-temperature heat pump system 200 to start operation. The low-temperature gas medium at the outlet of the gas expander 201 exchanges heat in the gas-to-gas heat exchanger 203 and becomes high-temperature gas. The high-temperature gas is further heated by the high-temperature gas compressor 204. The high-temperature gas compressor 204 is driven by the heat pump drive motor 202 to convert electrical energy into heat energy. The high-temperature gas, after being further heated by the high-temperature gas compressor 204, enters the molten salt gas heat exchanger 205 to exchange heat with the low-temperature molten salt from the low-temperature molten salt storage tank 302, transferring the heat energy in the high-temperature gas to the molten salt. The molten salt becomes high-temperature molten salt after its temperature rises. The high-temperature molten salt enters the high-temperature molten salt storage tank 301 for storage. Through the above process, heat transfer and storage are achieved.

[0025] During the energy release and power generation phase, the following modes can be selected based on grid dispatch and system conditions: compressed air energy storage system power generation mode, supercritical carbon dioxide power generation mode, and combined compressed air energy storage system and supercritical carbon dioxide power generation mode.

[0026] In the compressed air energy storage system power generation mode: the high-pressure air released from the gas storage tank 119 enters the first-stage gas-water heater 118, exchanges heat with the high-temperature water from the high-temperature water storage tank 113, and then enters the high-pressure air turbine 116 to do work and release part of the energy. After releasing the energy, the air medium enters the second-stage gas-water heater 115 to raise the temperature again and then enters the low-pressure air turbine 114 to continue to release energy. After releasing the energy, the air medium is discharged to the atmosphere through the end of the low-pressure air turbine 114.

[0027] In supercritical carbon dioxide power generation mode: the supercritical carbon dioxide power generation system 300 is put into operation. The supercritical carbon dioxide working fluid, after being heated by the molten salt carbon dioxide heat exchanger 303, enters the supercritical carbon dioxide turbine 304 to do work, driving the generator 305 to output electrical energy. The supercritical carbon dioxide working fluid releases some energy and enters the high-temperature regenerator 307 to exchange heat with the working fluid from the carbon dioxide re-compressor 306 to release some heat. Then it enters the low-temperature regenerator 308 to exchange heat with the working fluid from the main carbon dioxide compressor 310 to release heat. Part of it enters the precooler 309 to cool down and then goes to the main carbon dioxide compressor 310. Part of it enters the carbon dioxide re-compressor 306 for re-compression. The working fluid at the outlet of the carbon dioxide re-compressor 306 mixes with the working fluid from the low-temperature regenerator 308 and then enters the molten salt carbon dioxide heat exchanger 303 to be heated before starting the next cycle.

[0028] In the combined compressed air energy storage system and supercritical carbon dioxide power generation mode: including the mode in which compressed air energy storage system 100 and supercritical carbon dioxide power generation system 300 operate simultaneously.

[0029] The specific embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the substantive content of this utility model. Unless otherwise specified, the embodiments and features of this utility model can be arbitrarily combined with each other.

Claims

1. A multi-modal energy storage power plant system, characterized by, It includes a compressed air energy storage system (100), a high-temperature heat pump system (200), and a supercritical carbon dioxide power generation system (300). The compressed air energy storage system (100) includes a multimodal heat exchange subsystem, a first energy storage subsystem, and a first power generation system connected in sequence; the multimodal heat exchange subsystem includes a front-end heat exchange subsystem and a rear-end heat exchange subsystem connected in sequence to achieve staged heat exchange; The high-temperature heat pump system (200) includes an expander, a first heat exchanger, a compressor, a second heat exchanger, a first drive motor coaxially connected to the expander, and a second drive motor coaxially connected to the compressor; the expander, the first heat exchanger, the compressor, and the second heat exchanger are connected in sequence, and the second heat exchanger is also connected to the expander, so that the circulating medium is circulated within the high-temperature heat pump system (200); the first drive motor and the second drive motor are the same drive motor or different drive motors; The supercritical carbon dioxide power generation system (300) includes a second energy storage subsystem, a third heat exchanger, and a second power generation system connected in sequence. The front-end heat exchange subsystem is coupled with the first heat exchanger to transfer heat energy from the compressed air energy storage system (100) to the high-temperature heat pump system (200); the second heat exchanger is coupled with the second energy storage subsystem to transfer heat energy from the high-temperature heat pump system (200) to the supercritical carbon dioxide power generation system (300).

2. A multi-modal energy storage power plant system according to claim 1, wherein, The heat exchange unit in the front-end heat exchange subsystem has at least one stage, and the heat exchange unit in the rear-end heat exchange subsystem has one stage. The heat exchange units in the front-end heat exchange subsystem and the heat exchange units in the rear-end heat exchange subsystem have different structures to achieve multimodal staged heat exchange.

3. A multi-modal energy storage power plant system according to claim 2, wherein, The heat exchange unit in the front-end heat exchange subsystem has two stages, including a first-stage heat exchange unit and a second-stage heat exchange unit. The first-stage heat exchange unit includes a compressor (101), a drive motor (102), a first-stage air heat exchanger, and a first-stage heat exchanger. The second-stage heat exchange unit includes a compressor (105), a drive motor (106), a second-stage air heat exchanger, and a second-stage heat exchanger. The back-end heat exchange subsystem includes a three-stage heat exchange unit, which includes a compressor (109), a drive motor (110), and a heat exchanger. The first-stage drive motor (102), the second-stage drive motor (106), and the third-stage drive motor (110) can be the same drive motor or different drive motors. The first energy storage subsystem includes a first high-temperature medium storage tank, a first low-temperature medium storage tank, and a gas storage tank (119). The first-stage compressor (101) is coaxially connected to the first-stage drive motor (102); the input end of the first-stage compressor (101) is connected to the atmosphere, and the output end is connected to the first air input end of the first-stage air heat exchanger; the first air output end of the first-stage air heat exchanger is connected to the air input end of the first-stage heat exchanger, the second air input end is connected to the first air output end of the first heat exchanger, and the second air output end is connected to the first air input end of the first heat exchanger; the air output end of the first-stage heat exchanger is connected to the input end of the second-stage compressor (105), the low-temperature medium input end is connected to the first output end of the first low-temperature medium storage tank, and the high-temperature medium output end is connected to the first input end of the first high-temperature medium storage tank; The two-stage compressor (105) is coaxially connected to the two-stage drive motor (106); the output end of the two-stage compressor (105) is connected to the first air input end of the two-stage air heat exchanger; the first air output end of the two-stage air heat exchanger is connected to the air input end of the two-stage air heat exchanger, the second air input end is connected to the second air output end of the first heat exchanger, and the second air output end is connected to the second air input end of the first heat exchanger; the air output end of the two-stage heat exchanger is connected to the input end of the three-stage compressor (109), the low-temperature medium input end is connected to the second output end of the first low-temperature medium storage tank, and the high-temperature medium output end is connected to the second input end of the first high-temperature medium storage tank; The three-stage compressor (109) is coaxially connected to the three-stage drive motor (110); the output end of the three-stage compressor (109) is connected to the air input end of the three-stage heat exchanger; the air output end of the three-stage heat exchanger is connected to the input end of the gas storage tank (119); the low-temperature medium input end is connected to the third output end of the first low-temperature medium storage tank; and the high-temperature medium output end is connected to the third input end of the first high-temperature medium storage tank. The gas storage tank (119), the first high-temperature medium storage tank, and the first low-temperature medium storage tank are respectively connected to the first power generation system.

4. A multi-modal energy storage power plant system according to claim 3, wherein, The first power generation system includes a high-pressure air power generation unit and a low-pressure air power generation unit; the high-pressure air power generation unit includes a primary heater, a first generator set and a high-pressure air turbine (116), and the low-pressure air power generation unit includes a secondary heater, a second generator set and a low-pressure air turbine (114); the first generator set and the second generator set are the same generator set or different generator sets; The first generator set is coaxially connected to the high-pressure air turbine (116); the output end of the gas storage tank (119) is connected to the air input end of the first-stage heater, the air output end of the first-stage heater is connected to the air input end of the high-pressure air turbine (116), the air output end of the high-pressure air turbine (116) is connected to the air input end of the second-stage heater, the air output end of the second-stage heater is connected to the air input end of the low-pressure air turbine (114), and the air output end of the low-pressure air turbine (114) is connected to the atmosphere; the high-temperature medium input end of the first-stage heater is connected to the first output end of the first high-temperature medium storage tank, and the low-temperature medium output end is connected to the first input end of the first low-temperature medium storage tank; The high-temperature medium input terminal of the secondary heater is connected to the second output terminal of the first high-temperature medium storage tank, and the low-temperature medium output terminal is connected to the second input terminal of the first low-temperature medium storage tank.

5. A multi-modal energy storage power plant system according to claim 4, wherein, The first high-temperature medium storage tank stores high-temperature water, and the first low-temperature medium storage tank stores low-temperature water.

6. The multi-modal energy storage power plant system of claim 1, wherein, The circulating medium is a gaseous medium.

7. A multi-modal energy storage power plant system according to any one of claims 1 to 6, characterized in that, The second energy storage subsystem and the second power generation system are coupled and exchange heat through the third heat exchanger to realize the transfer of thermal energy from the second energy storage subsystem to the second power generation system; The second electronic system includes a supercritical carbon dioxide turbine (304), a generator (305), a carbon dioxide compressor unit, a regenerator unit, and a precooler (309); the supercritical carbon dioxide turbine (304) and the carbon dioxide compressor unit are coaxially connected to the generator (305); the input end of the supercritical carbon dioxide turbine (304) is connected to the carbon dioxide output end of the third heat exchanger, the output end is connected to the hot side inlet of the regenerator unit, the hot side outlet of the regenerator unit is connected to the input end of the precooler (309), the output end of the precooler (309) is connected to the input end of the carbon dioxide compressor unit, the output end of the carbon dioxide compressor unit is connected to the cold side inlet of the regenerator unit, and the cold side outlet of the regenerator unit is connected to the carbon dioxide input end of the third heat exchanger; The carbon dioxide compressor unit includes at least one carbon dioxide compressor, and the regenerator unit includes at least one regenerator.

8. A multi-modal energy storage power plant system according to claim 7, wherein, The carbon dioxide compressor unit includes a main carbon dioxide compressor (310) and a carbon dioxide re-compressor (306), and the main carbon dioxide compressor (310) and the carbon dioxide re-compressor (306) are coaxially connected to the generator (305); the regenerator unit includes a high-temperature regenerator (307) and a low-temperature regenerator (308). The output end of the supercritical carbon dioxide turbine (304) is connected to the hot-side inlet of the high-temperature regenerator (307), the hot-side outlet of the high-temperature regenerator (307) is connected to the hot-side inlet of the low-temperature regenerator (308), the first hot-side outlet of the low-temperature regenerator (308) is connected to the input end of the precooler (309), the output end of the precooler (309) is connected to the input end of the carbon dioxide main compressor (310), and the output end of the carbon dioxide main compressor (310) is connected to the low-temperature regenerator (308). The cold-side inlet of the low-temperature regenerator (308) is connected, and the cold-side outlet of the low-temperature regenerator (308) is connected to the first cold-side inlet of the high-temperature regenerator (307); the second hot-side outlet of the low-temperature regenerator (308) is connected to the input end of the carbon dioxide recompressor (306), the output end of the carbon dioxide recompressor (306) is connected to the second cold-side inlet of the high-temperature regenerator (307), and the cold-side outlet of the high-temperature regenerator (307) is connected to the carbon dioxide input end of the third heat exchanger.

9. A multi-modal energy storage power plant system according to claim 8, wherein, The second energy storage subsystem includes a second high-temperature medium storage tank and a second low-temperature medium storage tank; the input end of the second high-temperature medium storage tank is connected to the high-temperature medium output end of the second heat exchanger, and the output end is connected to the high-temperature medium input end of the third heat exchanger. The input end of the second cryogenic medium storage tank is connected to the cryogenic medium output end of the third heat exchanger, and the output end is connected to the cryogenic medium input end of the second heat exchanger.

10. A multi-modal energy storage power plant system according to claim 9, wherein, The energy storage medium used in the second energy storage subsystem is molten salt.

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