Compressed air energy storage power generation system coupled with high-temperature heat pump

Abstract

The utility model provides a compressed air energy storage power generation system coupled with a high-temperature heat pump, a compressed air energy storage subsystem is provided with a compressor module, a compressor outlet heat exchanger module, an expansion machine module and an expansion machine inlet heat exchanger module, and a high-temperature heat pump subsystem is provided with a heat pump expansion machine, a heat pump compressor and a heater. The heat storage subsystem is provided with a low-temperature heat storage tank and a high-temperature heat storage tank, in the heat storage period, the compressor module compresses external environment gas to increase the temperature of the external environment gas, the high-temperature heat pump subsystem is used for enabling a heat pump medium to sequentially exchange heat with high-temperature gas and a heat storage medium so as to heat the heat storage medium, and the heat storage subsystem is used for storing heat; the high-pressure gas absorbs heat stored by the heat storage medium, and then the expansion machine module is driven to do work for power generation. According to the compressed air energy storage power generation system, the electric energy output controllability, the heat storage performance and the electricity-electricity conversion efficiency of the compressed air energy storage power generation system can be effectively improved, and the complexity of building the system structure is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to compressed air energy storage power generation technical field, especially relate to a kind of compressed air energy storage power generation system of coupling high temperature heat pump. BACKGROUND

[0002] With the gradual exhaustion of fossil energy and the increasingly serious environmental problems, the traditional energy supply system dominated by thermal power generation is gradually transitioning to a new system mainly based on clean energy such as wind and solar energy. At the same time, the proportion of residential electricity and third industry electricity in power load continues to grow rapidly. Whether it is new energy power generation output or residential and third industry electricity load, both have strong intra-day volatility. These have put forward higher requirements for the flexibility of power system operation. The power system urgently needs large-scale flexible power sources to improve power supply structure, relieve system regulation pressure and solve new energy power consumption problems.

[0003] Compressed air energy storage has great development potential due to its large scale, low cost, green and environmentally friendly characteristics. However, the current domestic compressed air energy storage projects are limited by the design structure of compressed air energy storage power generation system and the high-temperature resistance of compressor materials. The exhaust temperature of the compressor is low, resulting in a large heat exchange system and low heat storage temperature, ultimately leading to low electric-to-electric conversion efficiency. In particular, because the lower limit of the operating temperature of the heat exchange medium is high, the cooling of compressed air is insufficient, which cannot meet the requirements of the next stage compressor inlet. An air cooler is also needed to achieve further cooling, resulting in low utilization rate of compression heat and complex overall structure, which seriously restricts the development process of compressed air energy storage technology. UTILITY MODEL CONTENT

[0004] The utility model provides a kind of compressed air energy storage power generation system of coupling high temperature heat pump to solve the technical problems of poor heat storage performance, low electric-to-electric conversion efficiency and complex system structure of conventional compressed air energy storage power generation system under prior art.

[0005] To solve the above problems, the technical scheme of the utility model is as follows: a compressed air energy storage power generation system coupled with a high-temperature heat pump, characterized by comprising:

[0006] A compressed air energy storage subsystem is provided with a compressor module and a compressor outlet heat exchanger module. The inlet of the compressor module is in communication with the external environment, and the outlet of the compressor module is in communication with the gas passage inlet of the compressor outlet heat exchanger module.

[0007] A high-temperature heat pump subsystem is provided with a heat pump expander, a heat pump compressor and a heater, an inlet of the heat pump expander is communicated with an outlet of a heat pump medium channel of the heater, an outlet of the heat pump expander is communicated with an inlet of a heat pump medium channel of a compressor outlet heat exchanger module, an outlet of the heat pump medium channel of the compressor outlet heat exchanger module is communicated with an inlet of the heat pump compressor, and an outlet of the heat pump compressor is communicated with an inlet of the heat pump medium channel of the heater;

[0008] The compressed air energy storage power generation system is configured to, during a heat storage period, the compressor module is used for compressing external environment gas, the external environment gas is heated and flows through a gas channel of the compressor outlet heat exchanger module, the heat pump medium is expanded by the heat pump expander to achieve cooling, and then flows through the heat pump medium channel of the compressor outlet heat exchanger module and the high-temperature and high-pressure gas to exchange heat to achieve primary heating, and then flows through the heat pump compressor to be compressed to achieve secondary heating, and then the heat pump medium flows through the heat pump medium channel of the heater to achieve heating operation on the low-temperature heat storage medium.

[0009] Preferably, the compressor module is provided with a plurality of compressor subunits, the compressor outlet heat exchanger module is provided with a plurality of compressor outlet heat exchanger subunits, and the plurality of compressor subunits and the plurality of compressor outlet heat exchanger subunits are alternately and sequentially connected in series to achieve staged compression of the external environment gas.

[0010] Preferably, the high-temperature heat pump subsystem is further provided with a regenerator, an inlet of a cold fluid channel of the regenerator is communicated with an outlet of the heat pump medium channel of the compressor outlet heat exchanger module, an outlet of the cold fluid channel of the regenerator is communicated with the inlet of the heat pump compressor, an inlet of a hot fluid channel of the regenerator is communicated with the outlet of the heat pump medium channel of the heater, and an outlet of the hot fluid channel of the regenerator is communicated with the inlet of the heat pump expander;

[0011] The regenerator is configured to, the heat pump medium flowing out of the outlet of the heater heat pump medium channel flows through the hot fluid channel of the regenerator, and transfers the remaining heat to the relatively low-temperature heat pump medium in the cold fluid channel of the regenerator to achieve three times heating of the relatively low-temperature heat pump medium.

[0012] Preferably, the system further comprises a heat storage subsystem, the heat storage subsystem is provided with a low-temperature heat storage tank, a cold molten salt pump, a high-temperature heat storage tank and a hot molten salt pump;

[0013] The outlet of the low-temperature heat storage tank is communicated with the inlet of the heat storage medium channel of the heater through the cold molten salt pump, the inlet of the high-temperature heat storage tank is communicated with the outlet of the heat storage medium channel of the heater, and the outlet of the high-temperature heat storage tank is communicated with the inlet of the low-temperature heat storage tank through the hot molten salt pump;

[0014] The heat storage subsystem is configured to, during a heat storage period, the low-temperature heat storage medium in the low-temperature heat storage tank flows through the heat storage medium channel of the heater, exchanges heat with the heat pump medium to rise in temperature, and then flows into the high-temperature heat storage tank for storage; during a discharge period, the high-temperature heat storage medium in the high-temperature heat storage tank flows out, exchanges heat to drop in temperature, and then flows into the low-temperature heat storage tank for storage.

[0015] Preferably, the compressed air energy storage subsystem is further provided with an expander module and an expander inlet heat exchanger module, the gas channel inlet of the expander inlet heat exchanger module is in communication with the gas channel outlet of the compressor outlet heat exchanger module, the gas channel outlet of the expander inlet heat exchanger module is in communication with the inlet of the expander module, and the outlet of the expander module is in communication with the external environment.

[0016] Moreover, the heat storage medium channel inlet of the expander inlet heat exchanger module is in communication with the outlet of the high-temperature heat storage tank, and the heat storage medium channel outlet of the expander inlet heat exchanger module is in communication with the inlet of the low-temperature heat storage tank.

[0017] The compressed air energy storage subsystem is configured to, during a discharge period, the high-temperature heat storage medium in the high-temperature heat storage tank flows through the heat storage medium channel of the expander inlet heat exchanger module, exchanges heat with the low-temperature high-pressure gas in the gas channel of the expander inlet heat exchanger module to drop in temperature, and then flows into the low-temperature heat storage tank, and the high-temperature high-pressure gas in the gas channel of the expander inlet heat exchanger module rises in temperature and is used to drive the expander module to work.

[0018] Preferably, the expander module is provided with a plurality of expander subunits, the expander inlet heat exchanger module is provided with a plurality of expander inlet heat exchanger subunits, and the plurality of expander subunits and the plurality of expander inlet heat exchanger subunits are sequentially and alternately connected in series, so as to realize the staged expansion of the high-pressure gas.

[0019] Preferably, the compressed air energy storage subsystem is further provided with a gas storage library, the inlet of the gas storage library is in communication with the gas channel outlet of the compressor outlet heat exchanger module, and the outlet of the gas storage library is in communication with the gas channel inlet of the expander inlet heat exchanger module, and the gas storage library is used to store the high-pressure gas.

[0020] Preferably, the high-temperature gas in the gas channel of the compressor outlet heat exchanger module exchanges heat with the low-temperature heat pump medium in the heat pump medium channel of the compressor outlet heat exchanger module, and the temperature of the high-temperature gas cools to below the ambient temperature.

[0021] The low-temperature gas in the gas channel of the expander inlet heat exchanger module is heated to 300℃~450℃ after exchanging heat with the high-temperature heat storage medium in the heat storage medium channel of the expander inlet heat exchanger module.

[0022] Preferably, the heat pump medium includes air or carbon dioxide gas.

[0023] Preferably, the heat storage medium includes molten salt.

[0024] Because of the adoption of the above technical solution, this utility model has the following advantages and positive effects compared with the prior art:

[0025] This invention provides a compressed air energy storage and power generation system coupled with a high-temperature heat pump. It comprises a compressed air energy storage subsystem, a high-temperature heat pump subsystem, and a thermal storage subsystem. The compressed air energy storage subsystem includes a compressor and an expander. During the thermal storage period, the compressor compresses air to generate heat energy. The high-temperature gas exchanges heat with the heat pump medium in the high-temperature heat pump subsystem through a compressor outlet heat exchanger. Specifically, in the high-temperature heat pump subsystem, the heat pump medium first expands and cools through the heat pump expander, then fully absorbs heat from the high-temperature gas, and is then compressed and heated again by the compressor. Finally, the high-temperature heat pump medium exchanges heat with the thermal storage medium through a heater. After being heated, the thermal storage medium is stored in a high-temperature thermal storage tank of the thermal storage subsystem, thus realizing the functions of heat generation and storage. Furthermore, during the heat release period, the high-temperature thermal storage medium in the high-temperature thermal storage tank exchanges heat with the compressed air in the compressed air energy storage subsystem through an expander inlet heat exchanger. The high-temperature, high-pressure gas then drives the expander to generate electricity, thus realizing a complete functional flow of electricity generating heat – heat storage – heat power generation. This invention enables more stable and controllable power output, effectively solving the technical problem of strong intraday fluctuations in traditional new energy power generation. At the same time, the compressed air energy storage power generation system constructed by this invention has better thermal storage performance, higher electricity-to-electricity conversion efficiency, and a simple system structure, effectively reducing the construction cost and land area of ​​the compressed air energy storage power generation system. Attached Figure Description

[0026] Figure 1 This utility model provides a structural schematic diagram of a compressed air energy storage and power generation system coupled with a high-temperature heat pump.

[0027] Explanation of reference numerals in the attached diagram: 1: Compressed air energy storage subsystem; 1.1: Compressor subunit; 1.2: Compressor outlet heat exchanger subunit; 1.3: Expander subunit; 1.4: Expander inlet heat exchanger subunit; 1.5: Air storage tank;

[0028] 2: High-temperature heat pump subsystem; 2.1: Heat pump expander; 2.2: Heat pump compressor; 2.3: Regenerator; 2.4: Heater;

[0029] 3: thermal storage subsystem; 3.1: high-temperature thermal storage tank; 3.2: low-temperature thermal storage tank; 3.3: hot molten salt pump; 3.4: cold molten salt pump. DETAILED DESCRIPTION

[0030] The compressed air energy storage power generation system coupled with high-temperature heat pump provided by the present application is further described in detail below in combination with the drawings and specific embodiments. The advantages and features of the present application will be more apparent according to the following description and claims.

[0031] Reference Figure 1 The present embodiment provides a compressed air energy storage power generation system coupled with high-temperature heat pump, which improves the heating temperature of compressed air during energy release to optimize the electric-to-electric conversion efficiency of the compressed air energy storage power generation system, reduces the complexity of building the compressed air energy storage power generation system, and improves the heat storage and power generation efficiency of the air energy storage power generation system.

[0032] Specifically, the compressed air energy storage power generation system includes a compressed air energy storage subsystem 1, a high-temperature heat pump subsystem 2, and a thermal storage subsystem 3.

[0033] The compressed air energy storage subsystem 1 is provided with a compressor module and a compressor outlet heat exchanger module. The compressor module can compress gas, and according to the ideal gas state equation and the first law of thermodynamics, when the outside does work on the gas to compress it, the internal energy of the gas increases, which can increase the temperature of the high-pressure gas. The compressor outlet heat exchanger module is internally provided with alternating gas channels and heat pump medium channels. When different media flow through the gas channels and heat pump medium channels of the compressor outlet heat exchanger module, heat exchange can be achieved due to the temperature difference between the different media. In the present embodiment, the inlet of the compressor module is in communication with the external environment, and air in the external environment can be input. The outlet of the compressor module is in communication with the gas channel inlet of the compressor outlet heat exchanger module, and the compressed high-pressure gas is transmitted to the gas channel of the compressor outlet heat exchanger module.

[0034] The high-temperature heat pump subsystem 2 is provided with a heat pump expander 2.1, a heat pump compressor 2.2 and a heater 2.4. Similarly, the heat pump expander 2.1 can be used to expand the heat pump medium, when the pressure of the heat pump medium decreases and the volume increases, the temperature decreases, the heat pump compressor 2.2 is used to compress the heat pump medium, when the pressure of the heat pump medium increases and the volume decreases, the temperature rises. The heater 2.4 is internally provided with an interactive heat pump medium channel and a heat storage medium channel, when the heat pump medium and the heat storage medium flow in the heat pump medium channel and the heat storage medium channel of the heater 2.4 respectively, heat exchange function can be realized between the two. In this embodiment, the inlet of the heat pump expander 2.1 is communicated with the outlet of the heat pump medium channel of the heater 2.4, the outlet of the heat pump expander 2.1 is communicated with the inlet of the heat pump medium channel of the compressor outlet heat exchanger module, the outlet of the heat pump medium channel of the compressor outlet heat exchanger module is communicated with the inlet of the heat pump compressor 2.2, and the outlet of the heat pump compressor 2.2 is communicated with the inlet of the heat pump medium channel of the heater 2.4.

[0035] Among them, the compressor module and the heat pump compressor 2.2 are driven by motors.

[0036] Therefore, in this embodiment, a heat pump medium circulation loop is formed in the high-temperature heat pump subsystem 2. During the heat storage period, the compressor module starts operation, absorbs air in the external environment and compresses, and the external environment gas flows through the gas channel of the compressor outlet heat exchanger module after being heated. In the high-temperature heat pump subsystem 2, the heat pump medium flows out from the outlet of the heat pump medium channel of the heater 2.4, is expanded by the heat pump expander 2.1, and then flows through the heat pump medium channel of the compressor outlet heat exchanger module. In the compressor outlet heat exchanger module, the heat pump medium and the high-temperature and high-pressure gas exchange heat, the heat pump medium absorbs the heat of the high-temperature and high-pressure gas to realize the first temperature rise, and then the heat pump medium flows through the heat pump compressor 2.2 again, and the temperature rises again after being compressed by the heat pump compressor 2.2 to realize the second temperature rise. Finally, the heat pump medium flows back to the heat pump medium channel of the heater 2.4, and in the heater 2.4, the high-temperature heat pump medium and the low-temperature heat storage medium exchange heat, the heat storage medium absorbs heat to rise in temperature, and the high-temperature heat pump medium decreases in temperature and flows into the heat pump expander 2.1 again to perform the next cycle. Thus, the low-quality heat energy generated after the compressed air is repeatedly circulated and released to the heat storage medium to realize the generation and migration of heat.

[0037] Further, the heat storage subsystem 3 is provided with a low-temperature heat storage tank 3.2, a cold molten salt pump 3.4, a high-temperature heat storage tank 3.1 and a hot molten salt pump 3.3. The low-temperature heat storage tank 3.2 is internally used for storing low-temperature heat storage medium, the high-temperature heat storage tank 3.1 is internally used for storing high-temperature heat storage medium, and the cold molten salt pump 3.4 and the hot molten salt pump 3.3 are used to drive the heat storage medium to flow in one direction along the communication pipeline. In this embodiment, the outlet of the low-temperature heat storage tank 3.2 is communicated with the heat storage medium passage inlet of the heater 2.4 through the cold molten salt pump 3.4, the inlet of the high-temperature heat storage tank 3.1 is communicated with the heat storage medium passage outlet of the heater 2.4, and the outlet of the high-temperature heat storage tank 3.1 is communicated with the inlet of the low-temperature heat storage tank 3.2 through the hot molten salt pump 3.3.

[0038] That is, in this embodiment, during the heat storage period, the cold molten salt pump 3.4 can enable the low-temperature heat storage medium in the low-temperature heat storage tank 3.2 to flow through the heat storage medium passage of the heater 2.4, the low-temperature heat storage medium is heated and stored in the high-temperature heat storage tank 3.1 after heat exchange with the high-temperature heat pump medium, realizing the migration and storage of heat, and during the energy release period, the hot molten salt pump 3.3 can enable the high-temperature heat storage medium in the high-temperature heat storage tank 3.1 to flow out, and the high-temperature heat storage medium is again stored in the low-temperature heat storage tank 3.2 after direct or indirect heat exchange.

[0039] Specifically, the compressed air energy storage subsystem 1 is further provided with an expander module and an expander inlet heat exchanger module. The expander module can utilize high-temperature and high-pressure gas to realize energy conversion by expansion work, that is, when the high-temperature and high-pressure gas enters the expander, the volume expands due to the decrease of gas pressure, and the mechanical energy generated in this process can drive the rotor or other moving parts inside the expander module to rotate, thereby converting the pressure energy of the fluid into mechanical energy or electrical energy. The expander inlet heat exchanger module is internally provided with interactive gas channels and heat storage medium channels. When different media flow through the gas channels and the heat storage medium channels of the expander inlet heat exchanger module, heat exchange function can be realized due to the temperature difference between different media. In this embodiment, the gas channel inlet of the expander inlet heat exchanger module is communicated with the gas channel outlet of the compressor outlet heat exchanger module, the gas channel outlet of the expander inlet heat exchanger module is communicated with the inlet of the expander module, and the outlet of the expander module is communicated with the external environment. Moreover, the heat storage medium channel inlet of the expander inlet heat exchanger module is communicated with the outlet of the high-temperature heat storage tank 3.1, and the heat storage medium channel outlet of the expander inlet heat exchanger module is communicated with the inlet of the low-temperature heat storage tank 3.2.

[0040] That is, in the present embodiment, during the energy release period, the hot molten salt pump 3.3 can make the high-temperature thermal storage medium in the high-temperature thermal storage tank 3.1 flow out, the high-temperature thermal storage medium flows through the thermal storage medium channel of the expander inlet heat exchanger module, in the expander inlet heat exchanger module, the high-temperature thermal storage medium exchanges heat with the low-temperature high-pressure gas, the high-temperature thermal storage medium flows into the low-temperature thermal storage tank 3.2 after being cooled, and the high-temperature high-pressure gas in the gas channel of the expander inlet heat exchanger module is used to drive the expander module to work, and after the work is completed, the high-temperature high-pressure gas is discharged to the external environment by the expander module outlet.

[0041] In summary, the present embodiment provides a compressed air energy storage power generation system coupled with a high-temperature heat pump, which realizes efficient conversion of electric energy-thermal energy-electric energy during the energy storage period and the heat release period through the cooperation of the compressed air energy storage subsystem 1, the high-temperature heat pump subsystem 2 and the heat storage subsystem 3, and realizes stable, controllable and real-time output of electric energy.

[0042] Preferably, in an embodiment, the compressor module is provided with a plurality of compressor sub-units 1.1, the compressor outlet heat exchanger module is provided with a plurality of compressor outlet heat exchanger sub-units 1.2, and the plurality of compressor sub-units 1.1 and the plurality of compressor outlet heat exchanger sub-units 1.2 are sequentially and alternately connected in series to realize the staged compression of the external environment gas. Figure 1 For example, in the present embodiment, there are three groups of compressor sub-units 1.1 and three groups of compressor outlet heat exchanger sub-units 1.2, after the first group of compressor sub-units 1.1 compresses the gas, and the heat of the high-pressure gas is absorbed by the heat pump medium in the first group of compressor outlet heat exchanger sub-units 1.2, the cooled high-pressure gas can be further compressed in the second group of compressor sub-units 1.1, and the compression heat generated is further absorbed by the heat pump medium in the second group of compressor outlet heat exchanger sub-units 1.2, and the working principle of the third group of compressor sub-units 1.1 and the third group of compressor outlet heat exchanger sub-units 1.2 is the same, so in the present embodiment, through multi-stage compression, the heat generation efficiency of the compressor module can be effectively improved, the electric energy and thermal energy loss can be reduced, and the damage risk of a single compressor sub-unit 1.1 caused by excessive mechanical stress and thermal stress can be reduced.

[0043] Similarly, in an embodiment, the expander module is provided with a plurality of expander sub-units 1.3, the expander inlet heat exchanger module is provided with a plurality of expander inlet heat exchanger sub-units 1.4, and the plurality of expander sub-units 1.3 and the plurality of expander inlet heat exchanger sub-units 1.4 are sequentially and alternately connected in series to realize the staged expansion of the high-pressure gas. Figure 1For example, in the embodiment, three sets of expander sub-units 1.3 and three sets of expander inlet heat exchanger sub-units 1.4 are provided. When the high-pressure gas is heat-absorbed in the first set of expander inlet heat exchanger sub-units 1.4, and the first set of expanders is driven to work, the gas after being cooled and slightly reduced in pressure can be further heat-absorbed in the second set of expander inlet heat exchanger sub-units 1.4, and the second set of expanders is further driven to work. The working principle of the third set of expander inlet heat exchanger sub-units 1.4 and the third set of expander sub-units 1.3 is the same, and thus, in the embodiment, through multi-stage expansion, the heat exchange efficiency of the gas and the heat storage medium can be fully improved, the heat energy loss can be reduced, and the power generation efficiency of the expander module can be improved.

[0044] In the embodiment, the high-temperature gas in the gas passage of the compressor outlet heat exchanger module is heat-exchanged with the low-temperature heat pump medium in the heat pump medium passage of the compressor outlet heat exchanger module, and the temperature of the high-temperature gas can be cooled to below the ambient temperature. That is, in the compressor outlet heat exchanger module, the heat exchange is fully achieved, and the heat-absorbing amount of the gas in the subsequent expander inlet heat exchanger module is improved, and the heat of the heat storage medium is fully recovered and utilized.

[0045] The low-temperature gas in the gas passage of the expander inlet heat exchanger module is heat-exchanged with the high-temperature heat storage medium in the heat storage medium passage of the expander inlet heat exchanger module, and the temperature of the low-temperature gas can be heated to 300-450°C, thereby effectively improving the power generation efficiency of the expander module.

[0046] Preferably, in an embodiment, the high-temperature heat pump sub-system 2 further comprises a regenerator 2.3, and the regenerator 2.3 is internally provided with an interactive cold fluid passage and a hot fluid passage. When different media flow through the cold fluid passage and the hot fluid passage of the regenerator 2.3, heat exchange can be achieved due to the temperature difference between the different media. In the embodiment, the inlet of the cold fluid passage of the regenerator 2.3 is in communication with the outlet of the heat pump medium passage of the compressor outlet heat exchanger module, the outlet of the cold fluid passage of the regenerator 2.3 is in communication with the inlet of the heat pump compressor 2.2, the inlet of the hot fluid passage of the regenerator 2.3 is in communication with the outlet of the heat pump medium passage of the heater 2.4, and the outlet of the hot fluid passage of the regenerator 2.3 is in communication with the inlet of the heat pump expander 2.1.

[0047] That is, in the present embodiment, the heat pump medium flowing out of the self-heater 2.4 heat pump medium passage outlet will first flow through the heat flow passage of the regenerator 2.3, and in the regenerator 2.3, the relatively high-temperature heat pump medium in the heat flow passage will transfer its remaining heat to the relatively low-temperature heat pump medium in the cold flow passage, that is, in the heat pump medium circulation loop, three times of heating for the relatively low-temperature heat pump medium in the heater 2.4 input side pipeline is realized to achieve the function of full circulation and recovery of heat pump medium heat. Among them, the heat pump efficiency of the high-temperature heat pump subsystem 2, including the heat pump efficiency of the overall circulation system composed of the heat pump expander 2.1, the heat pump compressor 2.2, the regenerator 2.3 and the heater 2.4, can be controlled between 1.4-2.4 in the present embodiment.

[0048] Preferably, in an embodiment, the compressed air energy storage subsystem 1 is also provided with a gas storage 1.5, the inlet of the gas storage 1.5 is in communication with the gas passage outlet of the compressor outlet heat exchanger module, and the outlet of the gas storage 1.5 is in communication with the gas passage inlet of the expander inlet heat exchanger module. In the present embodiment, similar to the compressed air energy storage subsystem, the heat storage subsystem 3 can be used to realize heat storage, and the gas storage 1.5 can realize high-pressure gas storage. When the expander module and the expander inlet heat exchanger module need to perform power generation work, the gas storage 1.5 outputs high-pressure gas, thereby realizing flexible and controllable power output and avoiding high-pressure gas loss and waste.

[0049] Preferably, in an embodiment, the heat pump medium includes air or carbon dioxide gas.

[0050] Preferably, in an embodiment, the heat storage medium includes molten salt.

[0051] Preferably, in an embodiment, the maximum heating temperature of the heat storage medium stored in the high-temperature heat storage tank 3.1 can reach 450℃.

[0052] In summary, the embodiment provides a compressed air energy storage power generation system coupled with a high-temperature heat pump, which is provided with a compressed air energy storage subsystem 1, a high-temperature heat pump subsystem 2 and a heat storage subsystem 3. The compressed air energy storage subsystem 1 is provided with a compressor and an expander. During a heat storage period, the compressor is used to compress air to generate heat energy of the gas. The high-temperature gas exchanges heat to heat pump medium in the high-temperature heat pump subsystem 2 through a compressor outlet heat exchanger. Specifically, in the high-temperature heat pump subsystem 2, the heat pump medium is first expanded and cooled by a heat pump expander 2.1, then fully absorbs heat in the high-temperature gas, is compressed and heated again by the compressor, and finally exchanges heat to the heat storage medium by a heater 2.4. The heat storage medium is stored in a high-temperature heat storage tank 3.1 of the heat storage subsystem 3 after being heated, so as to realize the functions of heat generation and storage. Further, during a heat release period, the high-temperature heat storage medium in the high-temperature heat storage tank 3.1 exchanges heat to the compressed air in the compressed air energy storage subsystem 1 through an expander inlet heat exchanger, and then the high-temperature and high-pressure gas drives the expander to generate power, so as to realize the complete function process of electric energy-heat generation-heat storage-heat generation. Through the embodiment, the electric energy output can be more stable and controllable, and the technical problem of strong daily fluctuation in the traditional new energy power generation process is effectively solved. Meanwhile, the compressed air energy storage power generation system constructed by the utility model has better heat storage performance, higher electric energy conversion efficiency, and simple system structure, which effectively reduces the construction cost and land occupation area of the compressed air energy storage power generation system.

[0053] The embodiments of the utility model are described in detail above in combination with the drawings, but the utility model is not limited to the above-mentioned embodiments. Even if various changes are made to the utility model, if the changes belong to the scope of the utility model claims and equivalent technologies, they still fall within the protection scope of the utility model.

Claims

1. A compressed air energy storage power generation system coupled with a high temperature heat pump, characterized in that, Comprise: compressed air energy storage subsystem, the compressed air energy storage subsystem is equipped with compressor module and compressor outlet heat exchanger module, the inlet of the compressor module is communicated with the external environment, the outlet of the compressor module is communicated with the gas passage inlet of the compressor outlet heat exchanger module; High-temperature heat pump subsystem, the high-temperature heat pump subsystem is equipped with heat pump expander, heat pump compressor and heater, the inlet of the heat pump expander is communicated with the heat pump medium passage outlet of the heater, the outlet of the heat pump expander is communicated with the heat pump medium passage inlet of the compressor outlet heat exchanger module, the heat pump medium passage outlet of the compressor outlet heat exchanger module is communicated with the inlet of the heat pump compressor, the outlet of the heat pump compressor is communicated with the heat pump medium passage inlet of the heater; The compressed air energy storage power generation system is configured to, during the heat storage period, the compressor module is used for compressing the external environment gas, the external environment gas is heated and flows through the gas passage of the compressor outlet heat exchanger module, the heat pump medium is expanded by the heat pump expander to realize cooling, and flows through the heat pump medium passage of the compressor outlet heat exchanger module and the high-temperature and high-pressure gas heat exchanger to realize the first heating, and then flows through the heat pump compressor to realize the second heating, and then the heat pump medium flows through the heat pump medium passage of the heater to realize the heating operation of the low-temperature heat storage medium.

2. The coupled high temperature heat pump compressed air energy storage power generation system of claim 1, wherein, The compressor module is provided with a plurality of compressor subunits, the compressor outlet heat exchanger module is provided with a plurality of compressor outlet heat exchanger subunits, a plurality of the compressor subunits and a plurality of the compressor outlet heat exchanger subunits are alternately connected in series to realize the staged compression of the external environment gas.

3. The coupled high temperature heat pump compressed air energy storage power generation system of claim 1, wherein, The high-temperature heat pump subsystem is also provided with a regenerator, the cold fluid passage inlet of the regenerator is communicated with the heat pump medium passage outlet of the compressor outlet heat exchanger module, the cold fluid passage outlet of the regenerator is communicated with the inlet of the heat pump compressor, the hot fluid passage inlet of the regenerator is communicated with the heat pump medium passage outlet of the heater, and the hot fluid passage outlet of the regenerator is communicated with the inlet of the heat pump expander; The regenerator is configured to, the heat pump medium flowing out of the heater heat pump medium passage outlet, flows through the hot fluid passage of the heat exchanger, and transfers the remaining heat to the relatively low-temperature heat pump medium in the cold fluid passage of the heat exchanger, to realize the third heating of the relatively low-temperature heat pump medium.

4. The coupled high temperature heat pump compressed air energy storage power generation system of claim 1, wherein, Also comprising a heat storage subsystem, the heat storage subsystem is provided with a low-temperature heat storage tank, a cold molten salt pump, a high-temperature heat storage tank and a hot molten salt pump; The outlet of the low-temperature heat storage tank is communicated with the inlet of the heat storage medium passage of the heater through the cold molten salt pump, the inlet of the high-temperature heat storage tank is communicated with the outlet of the heat storage medium passage of the heater, and the outlet of the high-temperature heat storage tank is communicated with the inlet of the low-temperature heat storage tank through the hot molten salt pump; The heat storage subsystem is configured to, during a heat storage period, low-temperature heat storage medium in the low-temperature heat storage tank flows through the heat storage medium channel of the heater, exchanges heat with the heat pump medium to be heated and then flows into the high-temperature heat storage tank for storage; during a discharge period, high-temperature heat storage medium in the high-temperature heat storage tank flows out, and the high-temperature heat storage medium is cooled by heat exchange and then flows into the low-temperature heat storage tank for storage.

5. The coupled high temperature heat pump compressed air energy storage power generation system of claim 4, wherein, The compressed air energy storage subsystem is also provided with an expander module and an expander inlet heat exchanger module, a gas passage inlet of the expander inlet heat exchanger module is in communication with a gas passage outlet of the compressor outlet heat exchanger module, a gas passage outlet of the expander inlet heat exchanger module is in communication with an inlet of the expander module, and an outlet of the expander module is in communication with an external environment. Further, a heat storage medium passage inlet of the expander inlet heat exchanger module is in communication with an outlet of the high-temperature heat storage tank, and a heat storage medium passage outlet of the expander inlet heat exchanger module is in communication with an inlet of the low-temperature heat storage tank. The compressed air energy storage subsystem is configured to, during a discharge period, high-temperature heat storage medium in the high-temperature heat storage tank flows through the heat storage medium channel of the expander inlet heat exchanger module, the high-temperature heat storage medium exchanges heat with low-temperature high-pressure gas in the gas passage of the expander inlet heat exchanger module to be cooled, and then flows into the low-temperature heat storage tank, and high-temperature high-pressure gas in the gas passage of the expander inlet heat exchanger module is used to drive the expander module to work.

6. The coupled high temperature heat pump compressed air energy storage power generation system of claim 5, wherein, The expander module is provided with a plurality of expander subunits, the expander inlet heat exchanger module is provided with a plurality of expander inlet heat exchanger subunits, and the plurality of expander subunits and the plurality of expander inlet heat exchanger subunits are sequentially and alternately connected in series, so as to realize staged expansion of high-pressure gas.

7. The coupled high temperature heat pump compressed air energy storage power generation system of claim 5, wherein, The compressed air energy storage subsystem is also provided with a gas storage library, an inlet of the gas storage library is in communication with a gas passage outlet of the compressor outlet heat exchanger module, and an outlet of the gas storage library is in communication with a gas passage inlet of the expander inlet heat exchanger module, and the gas storage library is used to store high-pressure gas.

8. The coupled high temperature heat pump compressed air energy storage power generation system of claims 1 or 5, wherein, High-temperature gas in the gas passage of the compressor outlet heat exchanger module is cooled to below ambient temperature after heat exchange with low-temperature heat pump medium in the heat pump medium passage of the compressor outlet heat exchanger module; Low-temperature gas in the gas passage of the expander inlet heat exchanger module is heated to 300-450 DEG C after heat exchange with high-temperature heat storage medium in the heat storage medium passage of the expander inlet heat exchanger module.

9. The coupled high temperature heat pump compressed air energy storage power generation system of claim 1, wherein, The heat pump medium includes air or carbon dioxide gas.

10. The coupled high temperature heat pump compressed air energy storage power generation system of claim 1, wherein, The heat storage medium includes molten salt.

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