Liquid air energy storage system with air separation function

Abstract

The invention relates to a liquid air energy storage system with an air separation function. The liquid air energy storage system comprises an air compressor module, a cooler module, a regenerator module, a heat storage medium storage module, a first expansion machine module, a second expansion machine module, a subcooler, a heater, a liquid air tank, a high-pressure tower, a low-pressure tower, a synergistic tower and a liquid oxygen tank. Compared with a single liquid air energy storage technology, the liquid air energy storage system with the air separation function has the advantages that the liquid air energy storage system is coupled with the air separation device, industrial gas produced by the air separation device is used for providing cooling capacity for compressed air, and therefore the cold storage capacity in the cold storage unit is reduced; therefore, the investment cost and the safety risk of the cold storage unit are reduced while the high efficiency of the cold storage unit is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of cryogenic refrigeration, and particularly to a liquid air energy storage system with an air separation function. Background Art

[0002] With the development of technology and economy, the demand for energy by humans is increasing. However, fossil energy is becoming increasingly depleted, and renewable energy such as solar energy and wind energy can be used as alternative solutions to replace the use of fossil fuels. However, renewable energy has volatility and intermittency, which causes many problems in grid connection, resulting in a very serious problem of abandoning wind and light. At the same time, in China, the grid peak shaving mainly relies on coal-fired generating units, but the frequent start-stop and load change of the units will reduce the service life and power generation efficiency of the equipment. To address these two problems, the liquid air energy storage technology is an effective solution. The liquid air energy storage technology has the advantages of large energy storage capacity, large energy storage density, low investment cost, long service life, and being unrestricted by geographical conditions, and is a very promising large-scale energy storage technology. The cold storage unit is the core component of the liquid air energy storage system, and its performance will greatly affect the cycle efficiency. Among them, the liquid-phase cold storage method has a high cold storage efficiency. Currently, methanol and propane are often used as the liquid-phase cold storage media. These two types of media are expensive and have certain safety hazards; the solid-phase cold storage method has a low investment cost and high safety, but the efficiency is low, and the internal inclined temperature layer dynamic effect in the packed bed weakens the cold storage performance. In addition, the liquid air energy storage system obtains benefits by using peak-valley electricity prices, and the profit-making method is relatively single, resulting in a long investment payback period for the liquid air energy storage system. The investment payback period of an independent liquid air energy storage system generally exceeds 15 years. Secondly, in the liquid air energy storage system, to ensure that the pipeline is not blocked, it is necessary to remove substances such as water, carbon dioxide, and hydrocarbons in the air in advance by using molecular sieves. However, the regeneration process of the adsorbent is a high-energy-consuming process, that is, the process of obtaining pure air is a high-energy-consuming process. The expanded pure air in the liquid air energy storage system is directly discharged to the atmosphere during the energy release period without being utilized, indirectly wasting a large amount of energy.

[0003] The air separation industry is the basis for the development of heavy industry and plays an irreplaceable role in industries such as chemical fertilizers, petrochemicals, metallurgy, and coal chemical industries. However, the air separation industry is a high-energy-consuming industry, resulting in high electricity costs during its operation. Generally speaking, the current liquid air energy storage system with an air separation function mainly has the following problems:

[0004] ① In the liquid air energy storage system, the performance of the cold storage unit determines the round-trip efficiency of the system. Therefore, the liquid air energy storage system requires a high-efficiency, high-safety, and low-cost cold storage method;

[0005] ② The liquid air energy storage system obtains benefits by taking advantage of the peak-valley electricity price. The greater the peak-valley electricity price difference, the higher the benefits. However, the benefits of a conventional single liquid air energy storage system are relatively low compared to the initial investment, resulting in a relatively long investment payback period.

[0006] ③ In the liquid air energy storage system, the expanded air is directly discharged into the atmosphere without being utilized, causing waste of pure air and indirectly wasting energy.

[0007] ④ The economic cost and time cost required for each startup of the air separation unit are very high, resulting in the air separation unit having to operate continuously for a long time. Moreover, the energy consumption of the air separation unit is relatively high, making the electricity cost during the operation of the air separation unit remain high.

[0008] ⑤ The operating conditions of a conventional liquid air energy storage system are single and cannot adjust the power generation according to the local power grid demand, which may cause a certain reduction in the enterprise's benefits. Summary of the Invention

[0009] Based on this, it is necessary to provide a liquid air energy storage system with an air separation function to solve the above problems existing in the background technology.

[0010] A liquid air energy storage system with an air separation function includes: an air compressor module, a cooler module, a cold accumulator module, a heat storage medium storage module, a first expander module, a second expander module, a subcooler, a heater, a liquid air tank, a high-pressure tower, a low-pressure tower, a booster tower, and a liquid oxygen tank.

[0011] The first outlet of the air compressor module is connected to the first inlet of the cooler module, the first outlet of the cooler module is connected to the first inlet of the heat storage medium storage module, the second outlet of the cooler module is connected to the first inlet of the cold accumulator module, the first outlet of the cold accumulator module is connected to the first inlet of the first expander module, and the first outlet of the first expander module is connected to the first inlet of the high-pressure tower; the first outlet of the heat storage medium storage module is connected to the first inlet of the heater, the first outlet of the heater is connected to the first inlet of the second expander module, and the second outlet of the cold accumulator module is connected to the second inlet of the heater.

[0012] The second outlet of the first expander module is connected to the first inlet of the liquid air tank, the first outlet of the liquid air tank is connected to the second inlet of the high-pressure column, the first outlet of the high-pressure column is connected to the first inlet of the subcooler, the first outlet of the subcooler is connected to the first inlet of the low-pressure column, the second outlet of the subcooler is connected to the first inlet of the booster column, the first outlet of the low-pressure column is connected to the second inlet of the booster column, the first outlet of the booster column is connected to the second inlet of the low-pressure column, and the second outlet of the low-pressure column is connected to the first inlet of the liquid oxygen tank.

[0013] In one embodiment, the heat storage medium storage module includes a high-temperature heat storage medium storage tank and a low-temperature heat storage medium storage tank.

[0014] In one embodiment, the first expander module includes a low-temperature air expander and a liquid expander.

[0015] In one embodiment, the air compressor included in the air compressor module is a two-stage or four-stage compressor.

[0016] In one embodiment, the regenerator module includes a regenerator with two or more stages.

[0017] In one embodiment, the second expander module includes an air expander with two or more stages.

[0018] In one embodiment, the heater module includes a heater with two or more stages.

[0019] The beneficial effects of the liquid air energy storage system with air separation function proposed by the present invention at least include:

[0020] ① Compared with the single liquid air energy storage technology, the liquid air energy storage system with air separation function proposed by the present invention couples the liquid air energy storage system with an air separation device, and uses the industrial gas produced by the air separation device to provide cold for the compressed air, thereby reducing the amount of cold storage in the cold storage unit, and while ensuring the high efficiency of the cold storage unit, reducing the investment cost and safety risk of the cold storage unit;

[0021] ② Compared with the single liquid air energy storage technology, the output products of the liquid air energy storage system with air separation function proposed by the present invention are nitrogen, oxygen, liquid oxygen and electricity. Therefore, the benefits of the system include the benefits of electricity and industrial gas, improving the economy of the system, and thus greatly shortening the investment payback period of the system;

[0022] ③ Compared with the single liquid air energy storage technology, the liquid air energy storage system with air separation function proposed by the present invention recovers the purified air after expansion and enables it to participate in air separation. On the one hand, it reduces the waste of purified air and energy, and on the other hand, it also uses it to produce high-value industrial gases to obtain profits;

[0023] ④ The liquid air energy storage system with air separation function proposed by the present invention couples the liquid air energy storage system with the air separation device. During the low valley period, a large amount of low-cost electricity is consumed to produce liquid air. Part of the liquid air is used for expansion power generation during the peak period, and the rest provides liquid phase raw materials for the distillation column throughout the cycle. Thus, the energy consumption of the air separation process is concentrated in the low valley period with low prices. Utilizing the characteristics of the liquid air energy storage system to absorb low-cost electricity and output high-cost electricity, in a certain way, a large amount of low-cost electricity and a small amount of high-cost electricity are consumed during the operation of the air separation device, thereby efficiently reducing the operation cost of the air separation device;

[0024] ⑤ Compared with the single liquid air energy storage technology, the liquid air energy storage system with air separation function proposed by the present invention changes the power generation during the peak period by adjusting the load of the distillation column. When the peak shaving demand of the local power grid is large, the load of the distillation column can be reduced, so that most of the liquid air is used for expansion power generation and a small part is used for air separation; when the peak shaving demand of the local power grid is small, the load of the distillation column can be increased, so that a small part of the liquid air is used for expansion power generation and most of it is used for air separation, improving the economy of the system. Therefore, the system has a more flexible peak shaving ability and a more stable economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic structural diagram of the liquid air energy storage system with air separation function provided by the embodiment of the present invention;

[0026] Figure 2 is a working state diagram of the liquid air energy storage system with air separation function provided by the present invention during the low valley period;

[0027] Figure 3 is a working state diagram of the liquid air energy storage system with air separation function provided by the present invention during the stable period;

[0028] Figure 4 is a working state diagram of the liquid air energy storage system with air separation function provided by the present invention during the peak period. DETAILED DESCRIPTION OF THE INVENTION

[0029] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0030] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs. The terms used in the description of the present invention in this specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0032] As Figure 1 shown, the present application provides a liquid air energy storage system with an air separation function. The liquid air energy storage system with an air separation function includes an air compressor module, a cooler module, a cold accumulator module, a heat storage medium storage module, a first expander module, a second expander module, a subcooler 10, a heater, a liquid air tank 19, a high-pressure tower 21, a low-pressure tower 11, a boosting tower 12, and a liquid oxygen tank 20;

[0033] The first outlet of the air compressor module is connected to the first inlet of the cooler module, the first outlet of the cooler module is connected to the first inlet of the heat storage medium storage module, the second outlet of the cooler module is connected to the first inlet of the cold accumulator module, the first outlet of the cold accumulator module is connected to the first inlet of the first expander module, and the first outlet of the first expander module is connected to the first inlet of the high-pressure tower 21; the first outlet of the heat storage medium storage module is connected to the first inlet of the heater, the first outlet of the heater is connected to the first inlet of the second expander module, and the second outlet of the cold accumulator module is connected to the second inlet of the heater;

[0034] The second outlet of the first expander module is connected to the first inlet of the liquid air tank 19, the first outlet of the liquid air tank 19 is connected to the second inlet of the high-pressure tower 21, the first outlet of the high-pressure tower 21 is connected to the first inlet of the subcooler 10, the first outlet of the subcooler 10 is connected to the first inlet of the low-pressure tower 11, the second outlet of the subcooler 10 is connected to the first inlet of the boosting tower 12, the first outlet of the low-pressure tower 11 is connected to the second inlet of the boosting tower 12, the first outlet of the boosting tower 12 is connected to the second inlet of the low-pressure tower 11, and the second outlet of the low-pressure tower 11 is connected to the first inlet of the liquid oxygen tank 20.

[0035] As shown Figure 2 in the figure Figure 2 is the working state diagram of the liquid air energy storage system with air separation function provided by the present invention during the low valley period. When the liquid air energy storage system with air separation function is in the low valley period, air is compressed in the air compressor module (1st stage air compressor 1 and 2nd stage air compressor 3) and reaches a high-pressure state. The compression heat is transferred to the heat storage medium in the cooler module (1st stage cooler 2 and 2nd stage cooler 4) and stored in the heat storage medium storage module (high-temperature heat storage medium storage tank 13). During this process, air compressors 1 and 3 are four-stage compressions. The compressed air enters the regenerator module (1st stage regenerator 5 and 2nd stage regenerator 6) to recover cold energy. The cold energy is provided by the regenerator medium in the regenerator module (1st stage regenerator 5 and 2nd stage regenerator 6), the waste nitrogen and nitrogen produced by the rectification column, the reflux low-temperature air in the liquid air tank 19, and the liquid oxygen stored in the liquid oxygen tank 20. Among them, a part of the air is extracted from the middle of the regenerator module (1st stage regenerator 5) and sent into the first expander module (low-temperature air expander 9). The expanded air enters the bottom of the high-pressure tower 21 to participate in air separation; the remaining air is completely cooled in the 1st stage regenerator 5 and then enters the first expander module (liquid expander 7) to expand. The expanded liquid air is throttled in the throttle valve and then enters the liquid air tank 19. The liquid phase is stored in the liquid air tank 19, and the gas phase refluxes into the 1st stage regenerator 5 and the 2nd stage regenerator 6 to provide cold energy for the compressed air. At the same time, a part of the liquid air is extracted from the liquid air tank 19, pressurized, and then enters the middle of the high-pressure tower 21 to participate in air separation. At the top of the high-pressure tower 21, nitrogen is obtained. The nitrogen enters the condensation heat exchanger 22, and the nitrogen is condensed into liquid nitrogen. A part of the liquid nitrogen is refluxed as the reflux liquid, and the other part is extracted and enters the subcooler 10 to recover cold energy. Oxygen-rich liquid air and lean liquid air are obtained at the bottom and middle of the high-pressure tower 21 respectively, and are sent into the subcooler 10 to recover cold energy. The subcooled liquid nitrogen and lean liquid air are throttled and then enter the top and upper middle parts of the low-pressure tower 11 respectively; a part of the subcooled oxygen-rich liquid air is throttled and enters the middle of the low-pressure tower 11, and the other part is throttled and then enters the condenser of the efficiency enhancement tower 12 as a cold source to cool the rising gas. The oxygen-rich liquid air coming out of the condenser has been divided into gas-liquid two phases, which are respectively sent into the middle of the low-pressure tower 11 to participate in air separation. A stream of argon-rich air is extracted from the middle and lower part of the low-pressure tower 11 and sent into the efficiency enhancement tower 12. After being separated by the efficiency enhancement tower 12, liquid air with low argon content is obtained at the bottom and sent into the middle and lower part of the low-pressure tower 11. Argon-rich air is obtained at the top of the low-pressure tower 11 and discharged. Nitrogen is obtained at the top of the low-pressure tower 11, and waste nitrogen is obtained in the upper middle part of the low-pressure tower 11. The waste nitrogen and argon-rich air are combined into a waste nitrogen-argon-rich mixed gas. The waste nitrogen and nitrogen enter the subcooler 10 to transfer a part of the cold energy to the liquid nitrogen, oxygen-rich liquid air, and lean liquid air. Liquid oxygen is obtained at the bottom of the low-pressure tower 11 and sent into the liquid oxygen tank 20.

[0036] As Figure 3 shown Figure 3 is the working state diagram of the liquid air energy storage system with air separation function provided by the present invention during the stable period. When the liquid air energy storage system with air separation function is in the stable period, after air is compressed in the air compressor module (1st-stage air compressor 1 and 2nd-stage air compressor 3), it reaches the medium-pressure state. Among them, the compression heat is transferred to the heat storage medium in the cooler module (1st-stage cooler 2 and 2nd-stage cooler 4) and stored in the heat storage medium storage module (high-temperature heat storage medium storage tank 13). In this process, the 1st-stage air compressor 1 and the 2nd-stage air compressor 3 are two-stage compressions. The compressed air enters the regenerator module (1st-stage regenerator 5 and 2nd-stage regenerator 6) to recover cold energy. The waste nitrogen and nitrogen produced by the rectification column provide the cold energy for it. The cooled air enters the first expander module (low-temperature air expander 8) to expand. The expanded air enters the high-pressure column 21 to participate in air separation. At the same time, a certain amount of liquid air is drawn out from the liquid air tank 19 and sent into the high-pressure column 21 to participate in air separation. During this stable period, the operation processes in the high-pressure column 21, low-pressure column 11, boosting column 12, and subcooler 10 are consistent with the operation processes of the above components during the low valley period. During this period, nitrogen and waste nitrogen transfer high-grade cold energy to liquid nitrogen, oxygen-rich liquid air, and lean liquid air, and then enter the regenerator to provide cold energy for the compressed air. Liquid oxygen is stored in the liquid oxygen tank 20 and is not output outward.

[0037] As Figure 4 shown Figure 4 is the working state diagram of the liquid air energy storage system with air separation function provided by the present invention during the peak period. When the liquid air energy storage system with air separation function is in the peak period, liquid air is drawn out from the liquid air tank 19, pressurized and then enters the 1st-stage regenerator 5 and 2nd-stage regenerator 6 to recover cold energy. The high-pressure normal-temperature air is heated to a high-temperature state in the heater module (1st-stage heater 16 and 2nd-stage heater 18), and then enters the second expander module (1st-stage air expander 15 and 2nd-stage air expander 17) to expand, thereby driving the generator to generate electricity. Among them, most of the expanded air is drawn out and sent into the cold box. After the expanded air obtains a certain amount of cold energy, it enters the rectification column to participate in rectification. At the same time, a certain amount of liquid air is drawn out from the liquid air tank 19, pressurized and then sent into the rectification column. During this peak period, the operation processes in the rectification column and the subcooler 10 are consistent with the operation processes of the above components during the low valley period and the stable period. After the nitrogen and waste nitrogen produced by the rectification column enter the subcooler 10 to recover high-grade cold energy, they enter the 1st-stage regenerator 5 and 2nd-stage regenerator 6 to recover low-grade cold energy; the produced liquid oxygen is stored in the liquid oxygen tank 20.

[0038] During the low load period, the liquid air energy storage system with air separation function uses the liquid oxygen stored in the liquid oxygen tank 20, the nitrogen and waste nitrogen produced by the rectification column to provide cooling for the compressed air, reducing the scale of the cold storage unit, thus reducing the investment cost of the cold storage unit and improving the safety of the system. The products output by the liquid air energy storage system with air separation function include electricity, liquid oxygen, oxygen and nitrogen, effectively improving the economy compared with a single liquid air energy storage system and greatly shortening the investment payback period of the liquid air energy storage system with air separation function. Moreover, during the high load period, the liquid air energy storage system with air separation function extracts a large amount of expanded air, allows it to obtain cooling and then enters the rectification column to participate in air separation, reducing the waste of pure air. In addition, the liquid air energy storage system with air separation function consumes a large amount of electricity during the low load period, but hardly consumes electricity and outputs electricity during the high load period. Taking advantage of the peak-valley electricity price difference, this design greatly reduces the operating cost of air separation. The liquid air energy storage system with air separation function can adjust the amount of air used for expansion power generation by adjusting the load of the rectification column. When the load of the rectification column decreases, the amount of liquid air used for expansion power generation increases; when the load of the rectification column increases, the amount of liquid air used for expansion power generation decreases. Therefore, when the liquid air energy storage system with air separation function is in the high load period, the power generation changes to meet different peak shaving requirements.

[0039] In one embodiment, the heat storage medium storage module includes a high-temperature heat storage medium storage tank and a low-temperature heat storage medium storage tank. It can be understood that in other embodiments, other heat storage methods can also play the role of storing the compressed heat, such as solid-phase heat storage, phase-change heat storage, liquid-phase heat storage and other heat storage methods.

[0040] In one embodiment, the first expander module includes a low-temperature air expander and a liquid expander. It can be understood that in other embodiments, a throttle valve can also play the role of refrigeration.

[0041] In one embodiment, the air compressor included in the air compressor module is a two-stage or four-stage compression.

[0042] In one embodiment, the cold storage module includes two or more stages of cold storage.

[0043] In one embodiment, the second expander module includes two or more stages of air expanders. Specifically, in this embodiment, a four-stage expansion stage group drives the generator set, and other numbers of stages can also play this role.

[0044] In one embodiment, the heater module includes two or more stages of heaters.

[0045] In summary, the core inventive points of the liquid air energy storage system with air separation function proposed by the present invention at least include:

[0046] ① By adjusting the load of the rectification column to change the power generation amount, the purpose of changing the peak shaving capacity can be achieved;

[0047] ② The liquid-phase raw material of the rectification unit always comes from the liquid air tank, but the gas-phase raw material sources in the three periods (valley period, stable period, and peak period) are different. In the valley period (i.e., the energy storage period), the gas-phase raw material comes from the high-pressure air output by the air compressor module; in the stable period (i.e., the static period), the gas-phase raw material comes from the medium-pressure air output by the air compressor module; in the peak period (i.e., the energy release period), the gas-phase raw material comes from the intermediate extraction of the second expander module, which ensures the continuous operation of the rectification unit;

[0048] ③ To ensure the continuous operation of the rectification unit and achieve the purpose of energy conservation, only the first two-stage compressors are turned on and the last two-stage compressors are turned off during the stable period, so that the air compressed by two stages directly enters the cooler module.

[0049] The beneficial effects of the liquid air energy storage system with air separation function proposed by the present invention at least include:

[0050] ① Compared with the single liquid air energy storage technology, the liquid air energy storage system with air separation function proposed by the present invention couples the liquid air energy storage system with the air separation device, and uses the industrial gas produced by the air separation device to provide cold for the compressed air, thereby reducing the cold storage amount in the cold storage unit, and while ensuring the high efficiency of the cold storage unit, reducing the investment cost and safety risk of the cold storage unit;

[0051] ② Compared with the single liquid air energy storage technology, the output products of the liquid air energy storage system with air separation function proposed by the present invention are nitrogen, oxygen, liquid oxygen and electricity. Therefore, the benefits of the system include the benefits of electricity and industrial gas, improving the economy of the system, and thus greatly shortening the investment payback period of the system;

[0052] ③ Compared with the single liquid air energy storage technology, the liquid air energy storage system with air separation function proposed by the present invention recovers the expanded pure air and makes it participate in air separation. On the one hand, it reduces the waste of pure air and energy, and on the other hand, it also uses it to produce high-value industrial gas and obtain profits;

[0053] ④The liquid air energy storage system with the function of separating air proposed by the present invention couples the liquid air energy storage system with an air separation unit. During the low-load period, a large amount of low-cost electricity is consumed to produce liquid air. A part of this liquid air is used for expansion power generation during the peak period, and the rest is used as the liquid-phase raw material for the rectification column throughout the cycle. Thus, the energy consumption of the air separation process is concentrated in the low-cost low-load period. By utilizing the characteristic of the liquid air energy storage system to absorb low-cost electricity and output high-cost electricity, and adopting a certain method, a large amount of low-cost electricity and a small amount of high-cost electricity are consumed during the operation of the air separation unit, thereby efficiently reducing the operation cost of the air separation unit;

[0054] ⑤Compared with the single liquid air energy storage technology, the liquid air energy storage system with the function of separating air proposed by the present invention can change the power generation amount during the peak period by adjusting the load of the rectification column. When the peak shaving demand of the local power grid is large, the load of the rectification column can be reduced so that most of the liquid air is used for expansion power generation and a small part is used for air separation; when the peak shaving demand of the local power grid is small, the load of the rectification column can be increased so that a small part of the liquid air is used for expansion power generation and most is used for air separation, improving the economy of the system. Therefore, this system has a more flexible peak shaving ability and more stable economy.

[0055] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0056] The above embodiments only represent the preferred implementation modes of the present invention, and the description is relatively specific and detailed. However, it should not be understood as a limitation to the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent should be subject to the appended claims.

Claims

1. A liquid air energy storage system with the function of separating air, characterized in that Comprising: An air compressor module, a cooler module, a regenerator module, a heat storage medium storage module, a first expander module, a second expander module, a subcooler, a heater, a liquid air tank, a high-pressure column, a low-pressure column, a boosting column and a liquid oxygen tank; The first outlet of the air compressor module is connected to the first inlet of the cooler module, the first outlet of the cooler module is connected to the first inlet of the heat storage medium storage module, the second outlet of the cooler module is connected to the first inlet of the regenerator module, the first outlet of the regenerator module is connected to the first inlet of the first expander module, and the first outlet of the first expander module is connected to the first inlet of the high-pressure column; The first outlet of the heat storage medium storage module is connected to the first inlet of the heater, the first outlet of the heater is connected to the first inlet of the second expander module, and the second outlet of the regenerator module is connected to the second inlet of the heater; The second outlet of the first expander module is connected to the first inlet of the liquid air tank, the first outlet of the liquid air tank is connected to the second inlet of the high-pressure column, the first outlet of the high-pressure column is connected to the first inlet of the subcooler, the first outlet of the subcooler is connected to the first inlet of the low-pressure column, the second outlet of the subcooler is connected to the first inlet of the boosting column, the first outlet of the low-pressure column is connected to the second inlet of the boosting column, the first outlet of the boosting column is connected to the second inlet of the low-pressure column, and the second outlet of the low-pressure column is connected to the first inlet of the liquid oxygen tank.

2. The liquid air energy storage system with the function of separating air according to claim 1, wherein The heat storage medium storage module includes a high-temperature heat storage medium storage tank and a low-temperature heat storage medium storage tank.

3. The liquid air energy storage system with the function of separating air according to claim 1, characterized in that, The first expander module includes a low-temperature air expander and a liquid expander.

4. The liquid air energy storage system with the function of separating air according to claim 1, characterized in that The air compressor included in the air compressor module is two-stage or four-stage compression.

5. The liquid air energy storage system with the function of separating air according to claim 1, characterized in that, The regenerator module includes a regenerator with two or more stages.

6. The liquid air energy storage system with the function of separating air according to claim 1, wherein The second expander module includes an air expander with two or more stages.

7. The liquid air energy storage system with the function of separating air according to claim 1, characterized in that The heater module includes a heater with two or more stages.

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