Liquid air energy storage power generation system

Abstract

An embodiment of the present invention provides a liquid air energy storage and power generation system, comprising: a liquid air energy storage unit, a liquid air energy release unit, an expansion power generation unit and a molecular sieve adsorption tower automatic regeneration unit. The liquid air energy storage unit includes a molecular sieve adsorption tower. The molecular sieve adsorption tower automatic regeneration unit is connected between the expansion power generation unit and the molecular sieve adsorption tower to use the exhaust gas of the expansion power generation unit to perform the regeneration process of the molecular sieve adsorption tower. Through this structural setting, during the liquid air energy storage process, the molecular sieve adsorption tower can perform adsorption work; during the liquid air energy release and expansion power generation process, the molecular sieve adsorption tower can use the exhaust gas of the expansion power generation unit to perform cold blowing and hot blowing processes. As a result, the system can make full use of the cold and hot energy in the liquid air energy release and expansion power generation process to complete the automatic regeneration process of the molecular sieve adsorption tower, thereby improving the economy and energy utilization efficiency of the system.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid air energy storage, and in particular to a liquid air energy storage power generation system. Background Art

[0002] In the liquid air energy storage system, water vapor and carbon dioxide will freeze and precipitate during the air cooling process, which will block the heat exchanger flow path and make the heat exchanger unable to produce; acetylene accumulation in the cold box will cause explosion accidents. Therefore, before the air enters the cold box for liquefaction, it is necessary to use a molecular sieve purification system to remove the water vapor, carbon dioxide, acetylene, etc. contained in it.

[0003] The traditional molecular sieve purification system needs to be equipped with a refrigeration unit before the air intake to pre-cool the air entering the molecular sieve purification system and increase the adsorption capacity of the molecular sieve; when the molecular sieve is regenerated, an additional electric heater is also required to heat the regenerated gas to remove as much impurity gas as possible. In the adsorption and regeneration process, additional equipment and energy consumption are required, and the system has low operating efficiency and poor economy. Summary of the invention

[0004] In response to the above technical problems, the present invention provides a liquid air energy storage and power generation system.

[0005] The present invention provides a liquid air energy storage power generation system, comprising: a liquid air energy storage unit, a liquid air energy release unit, an expansion power generation unit and a molecular sieve adsorption tower automatic regeneration unit.

[0006] Wherein, the liquid air energy storage unit is connected to the liquid air energy release unit. The liquid air energy release unit is connected to the expansion power generation unit to use liquid air for expansion power generation.

[0007] The liquid air energy storage unit includes a molecular sieve adsorption tower. The molecular sieve adsorption tower automatic regeneration unit is connected between the expansion power generation unit and the molecular sieve adsorption tower to use the exhaust gas of the expansion power generation unit to perform the regeneration process of the molecular sieve adsorption tower.

[0008] According to a liquid air energy storage power generation system provided by the present invention, the liquid air energy storage unit also includes a primary air compressor group, a precooler, a secondary air compressor group, a compression heat storage and utilization device, a cold storage device, a throttling element, a gas-liquid separator and a low-temperature storage tank. The precooler includes a first heat exchange side. The compression heat storage and utilization device includes a second heat exchange side. The cold storage device includes a third heat exchange side.

[0009] Wherein, the outlet of the primary air compressor unit is connected to the inlet of the first heat exchange side of the precooler. The outlet of the first heat exchange side is connected to the inlet of the molecular sieve adsorption tower. The outlet of the molecular sieve adsorption tower is connected to the inlet of the secondary air compressor unit. The outlet of the secondary air compressor unit is connected to the inlet of the second heat exchange side of the compressed heat storage and utilization device. The outlet of the second heat exchange side is connected to the inlet of the third heat exchange side of the cold storage device. The outlet of the third heat exchange side is connected to the inlet of the throttling element. The outlet of the throttling element is connected to the inlet of the gas-liquid separator. The liquid air outlet of the gas-liquid separator is connected to the inlet of the low-temperature storage tank.

[0010] According to a liquid air energy storage power generation system provided by the present invention, the cold storage device further includes a fourth heat exchange side. The precooler further includes a fifth heat exchange side.

[0011] The gas-phase air outlet of the gas-liquid separator is connected to the inlet of the fourth heat exchange side of the cold storage device. The outlet of the fourth heat exchange side is connected to the inlet of the fifth heat exchange side of the precooler. The outlet of the fifth heat exchange side is connected to the inlet of the secondary air compressor unit.

[0012] According to a liquid air energy storage power generation system provided by the present invention, the liquid air energy release unit includes a cryogenic pump, the cold storage device also includes a sixth heat exchange side, and the compression heat storage and utilization device also includes a seventh heat exchange side.

[0013] The outlet of the cryogenic storage tank is connected to the inlet of the cryogenic pump. The outlet of the cryogenic pump is connected to the inlet of the sixth heat exchange side of the cold storage device. The outlet of the sixth heat exchange side is connected to the inlet of the seventh heat exchange side of the compression heat storage and utilization device. The outlet of the seventh heat exchange side is connected to the expansion power generation unit.

[0014] According to a liquid air energy storage power generation system provided by the present invention, the expansion power generation unit includes an air turbine unit and a generator.

[0015] The outlet of the seventh heat exchange side of the compression heat storage and utilization device is connected to the air inlet of the air turbine unit through an energy-releasing power generation pipeline. The air turbine unit is connected to the generator.

[0016] According to a liquid air energy storage power generation system provided by the present invention, a first flow control valve is provided on the energy release power generation pipeline.

[0017] According to a liquid air energy storage power generation system provided by the present invention, the automatic regeneration unit of the molecular sieve adsorption tower includes a hot blowing branch pipe. The exhaust port of the air turbine unit is connected to an exhaust main pipe. The compressed heat storage and utilization device also includes an eighth heat exchange side. The inlet of the eighth heat exchange side is connected to the exhaust main pipe through the hot blowing branch pipe. A second flow control valve is provided on the hot blowing branch pipe. The outlet of the eighth heat exchange side is connected to the molecular sieve adsorption tower to perform a hot blowing process.

[0018] According to a liquid air energy storage power generation system provided by the present invention, the molecular sieve adsorption tower automatic regeneration unit further includes a cold blowing branch pipe. The molecular sieve adsorption tower is connected to the exhaust main pipe through the cold blowing branch pipe to perform a cold blowing process. The cold blowing branch pipe is provided with a third flow control valve.

[0019] According to a liquid air energy storage power generation system provided by the present invention, the liquid air energy storage unit further comprises an electric motor, which is connected to the primary air compressor group and the secondary air compressor group to drive the primary air compressor group and the secondary air compressor group to operate.

[0020] According to a liquid air energy storage power generation system provided by the present invention, the liquid air energy storage unit also includes an air purification device, and the outlet of the air purification device is connected to the inlet of the first-stage air compressor group.

[0021] In the liquid air energy storage and power generation system provided by the present invention, the liquid air energy storage unit is connected to the liquid air energy release unit. The liquid air energy release unit is connected to the expansion power generation unit to use liquid air for expansion power generation. The liquid air energy storage unit includes a molecular sieve adsorption tower. The molecular sieve adsorption tower automatic regeneration unit is connected between the expansion power generation unit and the molecular sieve adsorption tower to use the exhaust gas of the expansion power generation unit to perform the regeneration process of the molecular sieve adsorption tower.

[0022] Through this structural setting, during the liquid air energy storage process, the molecular sieve adsorption tower can perform adsorption work; during the liquid air energy release expansion power generation process, the molecular sieve adsorption tower can use the exhaust of the expansion power generation unit to perform cold blowing and hot blowing processes. As a result, the system can fully utilize the cold and hot energy in the liquid air energy release expansion power generation process to complete the automatic regeneration process of the molecular sieve adsorption tower, improving the economy and energy utilization efficiency of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 is a system principle diagram of a liquid air energy storage power generation system provided by an embodiment of the present invention;

[0025] Reference numerals:

[0026] 1: Air purification device; 2: First-stage air compressor unit;

[0027] 3: Precooler; 4: Molecular sieve adsorption tower;

[0028] 5: Two-stage air compressor unit; 6: Compression heat storage and utilization device;

[0029] 7: Cold storage device; 8: Throttling element;

[0030] 9: Gas-liquid separator; 10: Cryogenic storage tank;

[0031] 11: cryogenic pump; 12: first flow control valve;

[0032] 13: air turbine unit; 14: second flow control valve;

[0033] 15: The third flow control valve; 16: Energy-releasing power generation pipeline;

[0034] 17: hot blowing branch pipe; 18: exhaust main pipe;

[0035] 19: cold blowing branch pipe; H1: first heat exchange side;

[0036] H2: second heat exchange side; H3: third heat exchange side;

[0037] H4: fourth heat exchange side; H5: fifth heat exchange side;

[0038] H6: sixth heat exchange side; H7: seventh heat exchange side;

[0039] H8: the eighth heat exchange side; M: electric motor;

[0040] G: Generator. DETAILED DESCRIPTION

[0041] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0042] In the description of the embodiments of the present invention, it should be noted that the terms "center", "vertical",

[0043] "Horizontal", "Top", "Bottom", "Front", "Back", "Left", "Right", "Vertical", "Horizontal",

[0044] The directions or positional relationships indicated by “top”, “bottom”, “inside”, “outside”, etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the embodiments of the present invention. In addition, the term

[0045] “First” and “second” are used only for descriptive purposes and should not be understood as indicating or implying relative importance.

[0046] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0047] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0048] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, in the absence of mutual contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples to make the purpose, technical solutions and advantages of the embodiment of the present invention clearer. The technical solutions in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present invention.

[0049] Combine the following Figure 1 The liquid air energy storage power generation system provided by the present invention is described. It should be understood that the following description is only an illustrative embodiment of the present invention and does not constitute any particular limitation to the present invention.

[0050] The present invention provides a liquid air energy storage power generation system. Figure 1 As shown, the liquid air energy storage and power generation system includes: a liquid air energy storage unit, a liquid air energy release unit, an expansion power generation unit and a molecular sieve adsorption tower automatic regeneration unit.

[0051] The liquid air energy storage unit is connected to the liquid air energy release unit, and the liquid air energy release unit is connected to the expansion power generation unit to use liquid air for expansion power generation.

[0052] The liquid air energy storage unit includes a molecular sieve adsorption tower 4. The molecular sieve adsorption tower automatic regeneration unit is connected between the expansion power generation unit and the molecular sieve adsorption tower 4 to perform the regeneration process of the molecular sieve adsorption tower 4 using the exhaust gas of the expansion power generation unit.

[0053] Through this structural setting, during the liquid air energy storage process, the molecular sieve adsorption tower 4 can perform adsorption work; during the liquid air energy release expansion power generation process, the molecular sieve adsorption tower 4 can use the exhaust of the expansion power generation unit to perform cold blowing and hot blowing processes. As a result, the system can fully utilize the cold and hot energy in the liquid air energy release expansion power generation process to complete the automatic regeneration process of the molecular sieve adsorption tower 4, thereby improving the economy and energy utilization efficiency of the system.

[0054] In one embodiment of the present invention, the liquid air energy storage unit further includes a primary air compressor unit 2, a precooler 3, a secondary air compressor unit 5, a compression heat storage and utilization device 6, a cold storage device 7, a throttling element 8, a gas-liquid separator 9 and a low-temperature storage tank 10. The precooler 3 includes a first heat exchange side H1. The compression heat storage and utilization device 6 includes a second heat exchange side H2. The cold storage device 7 includes a third heat exchange side H3.

[0055] Among them, the outlet of the first-stage air compressor unit 2 is connected to the inlet of the first heat exchange side H1 of the precooler 3. The outlet of the first heat exchange side H1 is connected to the inlet of the molecular sieve adsorption tower 4. The outlet of the molecular sieve adsorption tower 4 is connected to the inlet of the second-stage air compressor unit 5. The outlet of the second-stage air compressor unit 5 is connected to the inlet of the second heat exchange side H2 of the compression heat storage and utilization device 6. The outlet of the second heat exchange side H2 is connected to the inlet of the third heat exchange side H3 of the cold storage device 7. The outlet of the third heat exchange side H3 is connected to the inlet of the throttling element 8. The outlet of the throttling element 8 is connected to the inlet of the gas-liquid separator 9. The liquid air outlet of the gas-liquid separator 9 is connected to the inlet of the low-temperature storage tank 10.

[0056] In one embodiment of the present invention, the liquid air energy storage unit further includes a motor M. The motor M is connected to the primary air compressor group 2 and the secondary air compressor group 5 to drive the primary air compressor group 2 and the secondary air compressor group 5 to operate.

[0057] Furthermore, in another embodiment of the present invention, the liquid air energy storage unit further includes an air purification device 1. The outlet of the air purification device 1 is connected to the inlet of the first-stage air compressor unit 2.

[0058] Specifically, during the liquid air energy storage process, the motor M drives the primary air compressor unit 2 and the secondary air compressor unit 5 to operate. The air at normal temperature and pressure is purified by the air purification device 1 and then compressed by the primary air compressor unit 2 to a medium temperature and high pressure state.

[0059] The air in the medium temperature and high pressure state enters the precooler 3 from the inlet of the first heat exchange side H1. The air cooled by the precooler 3 enters the molecular sieve adsorption tower 4 from the outlet of the first heat exchange side H1 for adsorption process. The air adsorbed by the molecular sieve adsorption tower 4 enters the secondary air compressor unit 5 for further pressurization. The air pressurized by the secondary air compressor unit 5 enters the compression heat storage and utilization device 6 from the inlet of the second heat exchange side H2, stores the compression heat in the compression heat storage and utilization device 6 and is cooled to room temperature. The air in the normal temperature and high pressure state enters the cold storage device 7 from the outlet of the second heat exchange side H2 and the inlet of the third heat exchange side H3, absorbs the cold energy in the cold storage medium and cools down to a low temperature state. The air in the low temperature and high pressure state enters the throttling element 8 from the outlet of the third heat exchange side H3, generates gas-liquid two-phase air after the pressure reduction and expansion of the throttling element 8, and enters the gas-liquid separator 9. Among them, the liquid air flows from the liquid air outlet of the gas-liquid separator 9 and is stored in the low temperature storage tank 10. Thus, the energy storage process of liquid air is completed.

[0060] It should be noted here that the present invention does not impose any limitation on the type of the air purification device 1. For example, the air purification device 1 includes a self-cleaning filter.

[0061] The primary air compressor unit 2 and the secondary air compressor unit 5 may be in the form of a piston type, a screw type or a centrifugal type. The primary air compressor unit 2 and the secondary air compressor unit 5 may include one or more air compressors. Multiple air compressors may be connected in series, in parallel or integrated into corresponding air compressor units.

[0062] The precooler 3 may be a shell and tube structure, a plate-fin structure, a coiled tube structure, or a combination thereof, or may be an air cooling tower.

[0063] The compression heat storage and utilization device 6 can be a packed bed heat accumulator, or a hot water circulation or heat transfer oil circulation system.

[0064] The cold storage device 7 can be one or more of liquid phase (methanol, propane and R123, etc.), solid phase (metal, rock and glass, etc.) or phase change cold storage material, etc. Liquid or gaseous air directly or indirectly contacts and exchanges heat with the cold storage medium. The cold storage device 7 can be set to one or more stages.

[0065] The throttling element 8 includes but is not limited to a low-temperature expander, and the low-temperature expander includes but is not limited to a liquid-carrying expander or a pure liquid expander.

[0066] The cryogenic storage tank 10 may be a Dewar tank or a cryogenic storage tank.

[0067] In one embodiment of the present invention, the cold storage device 7 further includes a fourth heat exchange side H4. The precooler 3 further includes a fifth heat exchange side H5.

[0068] The gas phase air outlet of the gas-liquid separator 9 is connected to the inlet of the fourth heat exchange side H4 of the cold storage device 7. The outlet of the fourth heat exchange side H4 is connected to the inlet of the fifth heat exchange side H5 of the precooler 3. The outlet of the fifth heat exchange side H5 is connected to the inlet of the secondary air compressor unit 5.

[0069] In combination with the above-mentioned embodiment, the gaseous air separated by the gas-liquid separator 9 flows back to the cold storage device 7 from the gas-phase air outlet of the gas-liquid separator 9 and the inlet of the fourth heat exchange side H4 to provide cold capacity for the cold storage device 7, and then enters the precooler 3 from the outlet of the fourth heat exchange side H4 and the inlet of the fifth heat exchange side H5 to cool the air entering the precooler 3 from the first-stage air compressor unit 2 and heat it up. The heated air is then merged into the second-stage air compressor unit 5 to be recompressed and utilized.

[0070] In one embodiment of the present invention, the liquid air energy release unit includes a cryogenic pump 11. The cold storage device 7 also includes a sixth heat exchange side H6. The compression heat storage and utilization device 6 also includes a seventh heat exchange side H7.

[0071] Among them, the outlet of the cryogenic storage tank 10 is connected to the inlet of the cryogenic pump 11. The outlet of the cryogenic pump 11 is connected to the inlet of the sixth heat exchange side H6 of the cold storage device 7. The outlet of the sixth heat exchange side H6 is connected to the inlet of the seventh heat exchange side H7 of the compression heat storage and utilization device 6. The outlet of the seventh heat exchange side H7 is connected to the expansion power generation unit.

[0072] Further, in one embodiment of the present invention, the expansion power generation unit includes an air turbine unit 13 and a generator G.

[0073] The outlet of the seventh heat exchange side H7 of the compression heat storage and utilization device 6 is connected to the air inlet of the air turbine unit 13 through the energy release and power generation pipeline 16. The air turbine unit 13 is connected to the generator G.

[0074] Furthermore, in one embodiment of the present invention, a first flow control valve 12 is provided on the energy-releasing power generation pipeline 16 .

[0075] Specifically, in the process of liquid air energy release and power generation, the liquid air in the cryogenic storage tank 10 is pressurized by the cryogenic pump 11 and enters the cold storage device 7 from the inlet of the sixth heat exchange side H6, and stores the cold in the cold storage medium and then reheats and gasifies. The reheated air enters the compression heat storage and utilization device 6 from the outlet of the sixth heat exchange side H6 and the inlet of the seventh heat exchange side H7 for preheating. The air preheated by the compression heat storage and utilization device 6 enters the air turbine unit 13 from the outlet of the seventh heat exchange side H7 through the energy release and power generation pipeline 16 to perform work, and further drives the generator G to generate electricity. At the same time, the first flow control valve 12 on the energy release and power generation pipeline 16 can control the air flow entering the air turbine unit 13.

[0076] It should be noted here that the structure of the cryopump 11 can be a piston type or a centrifugal type. The structure of the air turbine unit 13 can be a radial flow type, an axial flow type or a radial axial flow type. And the air turbine unit 13 can include one or more air turbines. Multiple air turbines are connected in series, in parallel or integrated into the air turbine unit 13.

[0077] In one embodiment of the present invention, the molecular sieve adsorption tower automatic regeneration unit includes a hot blowing branch pipe 17. An exhaust main pipe 18 is connected to the exhaust port of the air turbine unit 13. The compression heat storage and utilization device 6 also includes an eighth heat exchange side H8. The inlet of the eighth heat exchange side H8 is connected to the exhaust main pipe 18 through the hot blowing branch pipe 17. A second flow control valve 14 is provided on the hot blowing branch pipe 17. The outlet of the eighth heat exchange side H8 is connected to the molecular sieve adsorption tower 4 to perform a hot blowing process.

[0078] In the hot blowing process of the molecular sieve adsorption tower 4, the second flow control valve 14 is opened, and the dry and clean exhaust gas of the air turbine unit 13 enters the compression heat storage and utilization device 6 from the inlet of the eighth heat exchange side H8 through the exhaust main pipe 18 and the hot blowing branch pipe 17 for preheating, and then enters the molecular sieve adsorption tower 4 from the outlet of the eighth heat exchange side H8 for the hot blowing process.

[0079] In one embodiment of the present invention, the molecular sieve adsorption tower automatic regeneration unit further comprises a cold blowing branch pipe 19. The molecular sieve adsorption tower 4 is connected to the exhaust main pipe 18 via the cold blowing branch pipe 19 to perform the cold blowing process. The cold blowing branch pipe 19 is provided with a third flow control valve 15.

[0080] After the molecular sieve adsorption tower 4 completes the hot blowing process and reaches the desorption standard, the third flow control valve 15 is opened and the second flow control valve 14 is closed to perform the cold blowing process of the molecular sieve adsorption tower 4. The dry and clean exhaust gas of the air turbine unit 13 enters the molecular sieve adsorption tower 4 through the exhaust manifold 18 and the cold blowing branch pipe 19 to perform the cold blowing process. Thus, the automatic regeneration process of the molecular sieve adsorption tower 4 is completed.

[0081] According to the above described embodiments, the liquid air energy storage power generation system can realize the adsorption of the molecular sieve adsorption tower 4 during the liquid air energy storage process; and in the liquid air energy release power generation process, the exhaust gas of the air turbine unit 13 is used to perform the cold blowing and hot blowing processes of the molecular sieve adsorption tower 4. Thus, the molecular sieve adsorption tower 4 can perform the adsorption and regeneration processes in a continuous cycle.

[0082] It should be noted here that the first flow control valve 12 , the second flow control valve 14 and the third flow control valve 15 include but are not limited to pneumatic, electric or liquid driving modes.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A liquid air energy storage power generation system, characterized in that: include: Liquid air energy storage unit, liquid air energy release unit, expansion power generation unit and molecular sieve adsorption tower automatic regeneration unit, The liquid air energy storage unit is connected to the liquid air energy release unit, and the liquid air energy release unit is connected to the expansion power generation unit, so as to use liquid air for expansion power generation. The liquid air energy storage unit comprises a molecular sieve adsorption tower (4), and the molecular sieve adsorption tower automatic regeneration unit is connected between the expansion power generation unit and the molecular sieve adsorption tower (4) so ​​as to use the exhaust gas of the expansion power generation unit to perform the regeneration process of the molecular sieve adsorption tower (4); The liquid air energy storage unit further comprises a primary air compressor unit (2), a precooler (3), a secondary air compressor unit (5), a compression heat storage and utilization device (6), a cold storage device (7), a throttling element (8), a gas-liquid separator (9) and a low-temperature storage tank (10), wherein the precooler (3) comprises a first heat exchange side (H1), the compression heat storage and utilization device (6) comprises a second heat exchange side (H2), and the cold storage device (7) comprises a third heat exchange side (H3). The outlet of the primary air compressor unit (2) is connected to the inlet of the first heat exchange side (H1) of the precooler (3), the outlet of the first heat exchange side (H1) is connected to the inlet of the molecular sieve adsorption tower (4), the outlet of the molecular sieve adsorption tower (4) is connected to the inlet of the secondary air compressor unit (5), the outlet of the secondary air compressor unit (5) is connected to the inlet of the second heat exchange side (H2) of the compression heat storage and utilization device (6), the outlet of the second heat exchange side (H2) is connected to the inlet of the third heat exchange side (H3) of the cold storage device (7), the outlet of the third heat exchange side (H3) is connected to the inlet of the throttling element (8), the outlet of the throttling element (8) is connected to the inlet of the gas-liquid separator (9), and the liquid air outlet of the gas-liquid separator (9) is connected to the inlet of the low-temperature storage tank (10); The cold storage device (7) further includes a fourth heat exchange side (H4), and the precooler (3) further includes a fifth heat exchange side (H5). The gas-phase air outlet of the gas-liquid separator (9) is connected to the inlet of the fourth heat exchange side (H4) of the cold storage device (7), the outlet of the fourth heat exchange side (H4) is connected to the inlet of the fifth heat exchange side (H5) of the precooler (3), and the outlet of the fifth heat exchange side (H5) is connected to the inlet of the secondary air compressor unit (5); The liquid air energy release unit comprises a cryogenic pump (11), the cold storage device (7) further comprises a sixth heat exchange side (H6), and the compression heat storage and utilization device (6) further comprises a seventh heat exchange side (H7). The outlet of the cryogenic storage tank (10) is connected to the inlet of the cryogenic pump (11), the outlet of the cryogenic pump (11) is connected to the inlet of the sixth heat exchange side (H6) of the cold storage device (7), the outlet of the sixth heat exchange side (H6) is connected to the inlet of the seventh heat exchange side (H7) of the compression heat storage and utilization device (6), and the outlet of the seventh heat exchange side (H7) is connected to the expansion power generation unit; The expansion power generation unit comprises an air turbine unit (13) and a generator (G), The outlet of the seventh heat exchange side (H7) of the compression heat storage and utilization device (6) is connected to the air inlet of the air turbine unit (13) through the energy release power generation pipeline (16), and the air turbine unit (13) is connected to the generator (G); The molecular sieve adsorption tower automatic regeneration unit comprises a hot blowing branch pipe (17), the exhaust port of the air turbine unit (13) is connected to an exhaust main pipe (18), the compression heat storage and utilization device (6) further comprises an eighth heat exchange side (H8), the inlet of the eighth heat exchange side (H8) is connected to the exhaust main pipe (18) through the hot blowing branch pipe (17), a second flow control valve (14) is provided on the hot blowing branch pipe (17), and the outlet of the eighth heat exchange side (H8) is connected to the molecular sieve adsorption tower (4) to perform a hot blowing process; The molecular sieve adsorption tower automatic regeneration unit also includes a cold blowing branch pipe (19), and the molecular sieve adsorption tower (4) is connected to the exhaust main pipe (18) through the cold blowing branch pipe (19) to perform a cold blowing process. The cold blowing branch pipe (19) is provided with a third flow control valve (15).

2. The liquid air energy storage power generation system according to claim 1, characterized in that: The energy-releasing power generation pipeline (16) is provided with a first flow control valve (12).

3. The liquid air energy storage power generation system according to claim 1, characterized in that: The liquid air energy storage unit further comprises an electric motor (M), wherein the electric motor (M) is connected to the primary air compressor group (2) and the secondary air compressor group (5) to drive the primary air compressor group (2) and the secondary air compressor group (5) to operate.

4. The liquid air energy storage power generation system according to claim 1, characterized in that: The liquid air energy storage unit further comprises an air purification device (1), the outlet of the air purification device (1) being connected to the inlet of the primary air compressor unit (2).

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