Air purification system and liquefied air energy storage device

Abstract

The invention relates to the technical field of liquefied air energy storage, in particular to an air purification system and a liquefied air energy storage device. The air purification system comprises a purifier, a heat exchange unit and a booster fan, and the purifier filled with an adsorbent is connected in the air pressurization system in series so as to purify flowing air in the energy storage stage; the heat exchange unit is connected in series between an outlet of the booster fan and a regenerated gas inlet of the purifier, an inlet of the booster fan is communicated to an air emptying pipeline of the expansion power generation system, and the heat exchange unit has a heating function and a cooling function on flowing air. In the energy release power generation stage, the heater can be used for heating air firstly and then cooling the air, so that regeneration hot blowing is carried out on the purifier firstly, and then regeneration cold blowing is carried out. And the cycle period of adsorption and activation is one day, so that the utilization rate of equipment is effectively improved. And meanwhile, regeneration hot blowing and cold blowing are continuously carried out, so that the activation effect is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of liquefied air energy storage, and in particular to an air purification system and a liquefied air energy storage device. Background Art

[0002] Liquefied air energy storage, an energy storage technology, uses air as an energy storage medium. In the energy storage stage, that is, the period of low grid load, electric energy is used to continuously remove heat from the air, so that the air is cooled and liquefied and then stored in a container; in the energy release and power generation stage, that is, the peak period of grid load, low-temperature and high-pressure liquefied air is released to vaporize and drive the air expander to generate electricity.

[0003] The purifier is an important device of the liquefied air energy storage device. It is equipped with adsorbents. During the energy storage stage, the adsorbents are used to adsorb and purify the compressed air before liquefaction, remove impurities such as moisture and carbon dioxide in the compressed air, and prevent the equipment from being unable to work normally due to freezing at low temperatures. The adsorbent needs to be activated and regenerated after being used for a period of time. The activation and regeneration process is to use hot air and cold air to heat and cold blow the adsorbent in turn, so that the impurities adsorbed by the adsorbent are desorbed at high temperature and then taken out by the hot air and subsequent cold air.

[0004] The current air purification scheme is to set up two purifiers, denoted as purifier A and purifier B. The specific working process is as follows: on the first day: in the energy storage stage, purifier A performs adsorption purification, purifier B performs regeneration cold blowing, and both are shut down after the adsorption purification is completed; in the energy release power generation stage, purifier A performs regeneration hot blowing, purifier B is shut down, and purifier A is also shut down after power generation is completed; on the second day: in the energy storage stage, purifier B performs adsorption purification, purifier A performs regeneration cold blowing, and both are shut down after adsorption purification is completed; in the energy release power generation stage, purifier B performs regeneration hot blowing, purifier A is shut down, and purifier B is also shut down after power generation is completed. The working sequence of the first and second days is then repeated.

[0005] In this scheme, the cycle of each purifier from adsorption to regeneration for the next adsorption is 2 days, the equipment utilization rate is low, the equipment investment is high, the floor space is large, and the construction workload is large. At the same time, the regeneration hot blowing of the adsorbent is in the energy release and power generation stage, and the regeneration cold blowing is in the liquefaction and energy storage stage. The hot blowing and cold blowing are not carried out continuously and the interval is long. After the hot blowing is completed, the cold blowing cannot be carried out immediately. There may be water vapor that has not been completely removed and is sealed in the purifier for a long time, which has an adverse effect on the adsorbent. Summary of the invention

[0006] The purpose of the present invention is to provide an air purification system and a liquefied air energy storage device, so as to use one purifier to complete air purification and improve equipment utilization; at the same time, the cold blowing and hot blowing of the adsorbent can be carried out continuously to ensure the adsorption performance and service life of the adsorbent.

[0007] To a certain extent, the technical problems in the prior art are solved.

[0008] The present invention provides an air purification system, comprising a purifier, a heat exchange unit and a booster fan;

[0009] The purifier is filled with an adsorbent, and the purifier is used to be connected in series to the air boosting system of the liquefied air energy storage device to purify the air flowing through;

[0010] The purifier is provided with a regeneration gas inlet and a regeneration gas outlet. The heat exchange unit is connected in series between the outlet of the booster fan and the regeneration gas inlet of the purifier. The inlet of the booster fan is connected to the air discharge pipeline of the expansion power generation system of the liquefied air energy storage device. The heat exchange unit has heating and cooling functions for the air flowing through.

[0011] Further, the heat exchange unit includes a heater and a cooler;

[0012] The heater and the cooler are arranged in parallel, and the air pressurized by the booster fan can flow to the purifier after being heated by the heater, or flow to the purifier after being cooled by the cooler.

[0013] Further, the heater includes a third air channel and a third heat exchange channel;

[0014] The third air channel is connected in series between the booster fan and the purifier;

[0015] The liquefied air energy storage device includes a heat storage system, which includes a heating side. The third heat exchange channel is connected in series between the inlet and outlet of the heating side. The heat exchange medium in the heat storage system can flow through the third heat exchange channel to serve as a heat source to heat the air flowing through the third air channel.

[0016] Furthermore, the cooler includes a primary cooler and a secondary cooler connected in series, and the air pressurized by the booster fan can be cooled in the primary cooler and the secondary cooler in sequence and then flow to the purifier.

[0017] Further, the primary cooler includes a first air channel and a first heat exchange channel;

[0018] The first air channel is connected in series between the booster fan and the purifier;

[0019] The heat storage system includes a refrigeration side, the first heat exchange channel is connected in series between the inlet and outlet of the refrigeration side, and the heat exchange medium in the heat storage system can flow through the first heat exchange channel to serve as a cold source to cool the air flowing through the first air channel.

[0020] Further, the secondary cooler includes a second air channel and a second heat exchange channel;

[0021] The second air channel is connected in series between the first air channel and the purifier;

[0022] The air purification system also includes a cold water unit, and the second heat exchange channel is connected in series between the inlet and outlet of the cold water unit. The cold water in the cold water unit can flow through the second heat exchange channel to serve as a cold source to cool the air flowing through the second air channel.

[0023] Further, the air boosting system comprises a primary compression unit and a secondary compression unit connected in series;

[0024] The purifier is connected in series between the primary compression unit and the secondary compression unit.

[0025] Further, the primary compression unit comprises a compressor, a first cooler and a second cooler connected in series in sequence, and air from the compressor flows through the hot fluid side of the first cooler and the second cooler in sequence;

[0026] The cold fluid side of the first cooler is connected in series between the inlet and outlet of the refrigeration side of the heat storage system, and the cold fluid side of the second cooler is connected in series between the inlet and outlet of the cold water unit.

[0027] Further, it also includes a gas storage tank;

[0028] The gas storage tank is connected to the outlet of the secondary compression unit, and the gas storage tank is connected to the purifier through a first pressure control valve;

[0029] The purifier is connected with a pressure relief pipeline, and a second pressure control valve is arranged on the pressure relief pipeline.

[0030] The present invention also provides a liquefied air energy storage device, comprising any one of the liquefied air energy storage devices described above.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] The air purification system provided by the present invention includes a purifier, a heat exchange unit and a booster fan. The liquefied air energy storage device includes an air boosting system, and a purifier equipped with an adsorbent is connected in series in the air path of the air boosting system. In the energy storage stage, the air in the air boosting system can flow through the purifier for adsorption purification before being liquefied to remove impurities in the air. The liquefied air energy storage device also includes an expansion power generation system, the inlet of the booster fan is connected to the air venting pipeline of the expansion power generation system, the purifier has a regeneration gas inlet and a regeneration gas outlet, and the heat exchange unit is connected in series between the outlet of the booster fan and the regeneration gas inlet of the purifier. In the energy release power generation stage, part of the air after expansion power generation is emptied through the air venting pipeline of the expander, and the other part is used as regeneration gas, which flows to the subsequent heat exchange unit and purifier after being pressurized by the booster fan, and finally discharged through the regeneration gas outlet of the purifier.

[0033] The heat exchange unit has heating and cooling functions for the air flowing through it; in actual operation, the heating function of the heat exchange unit is first turned on, so that the heat exchange unit can be used to heat the air flowing to the purifier into hot air, thereby achieving hot blowing of the adsorbent in the purifier, so that the impurities adsorbed by the adsorbent in the energy storage stage are desorbed and discharged with the hot air; then the heating function of the heat exchange unit is turned off, and the cooling function is started, so that the heat exchange unit can be used to cool the air flowing to the purifier into cold air, thereby achieving cold blowing of the adsorbent in the purifier, and continuing to take the desorbed impurities out of the purifier.

[0034] Therefore, the present application utilizes a purifier to adsorb and purify the air during the daily energy storage stage, and then completes the activation and regeneration of the adsorbent during the daily energy release and power generation stage, so that the cycle of the purifier from adsorption to completion of activation and regeneration in preparation for the next adsorption is one day, thereby effectively providing equipment utilization. At the same time, the regenerative hot blowing and regenerative cold blowing of the adsorbent are carried out continuously, so that the impurities desorbed from the adsorbent can be more thoroughly taken out of the purifier, ensuring that the adsorbent has good activity and service life after activation and regeneration. At the same time, the air sources for the regenerative hot blowing and regenerative cold blowing are both from the air expanded and generated by the expansion power generation system. When the booster fan is working, it only needs to consider the working condition of positive pressure air supply, so that the inlet of the booster fan has a stable working condition, thereby ensuring the working stability of the booster fan, and can simplify the piping of the booster fan to a certain extent. At the same time, the existing adsorbent activation and regeneration scheme is to use the liquid air flash vapor of the air liquefaction system as the gas source for the regeneration cold blow during the energy storage stage; while in the present application, the liquid air flash vapor from the air liquefaction system is no longer used for the regeneration cold blow gas during the energy storage stage, but is returned to the raw air intake port and incorporated into the raw air. Since the impurities such as moisture and carbon dioxide in the liquid air flash vapor have been removed to a qualified level, the content of impurities such as moisture and carbon dioxide in the raw gas can be reduced, thereby reducing the compression work of the raw gas and the adsorption consumption of the purifier.

[0035] The present invention also provides a liquefied air energy storage device, comprising the air purification system, so the liquefied air energy storage device also has the beneficial effects of the air purification system. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 A schematic diagram of the flow chart of an air purification system in a liquefied air energy storage device provided in an embodiment of the present invention.

[0038] Reference numerals:

[0039] 1-purifier, 2-boosting fan, 3-heat exchange unit, 4-heater, 5-primary cooler, 6-secondary cooler, 7-gas storage tank, 8-first pressure control valve, 9-second pressure control valve. DETAILED DESCRIPTION

[0040] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0041] The components of the embodiments of the present invention generally described and shown in the drawings herein may be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention.

[0042] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

[0043] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0044] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] Refer to the following Figure 1 An air purification system and a liquefied air energy storage device according to some embodiments of the present application are described.

[0046] The present application provides an air purification system for use in a liquefied air energy storage device to purify compressed air before liquefaction during the energy storage stage of the liquefied air energy storage device.

[0047] like Figure 1 As shown, the air purification system provided by the present application includes a purifier 1, a heat exchange unit 3 and a booster fan 2.

[0048] The liquefied air energy storage device includes an air boosting system and an air liquefaction system. In the energy storage stage, the compressed air passes through the air boosting system to form high-pressure and low-temperature liquefied air and is stored in the liquefied air storage tank of the air liquefaction system. The purifier 1 equipped with an adsorbent is connected in series to the air path of the air boosting system. In the energy storage stage, the air in the air boosting system can flow through the purifier 1 for adsorption and purification before being liquefied to remove impurities in the air.

[0049] The liquefied air energy storage device also includes an expansion power generation system. The liquefied air from the air liquefaction system enters the expansion power generation system after vaporization, drives the expander of the expansion power generation system to generate electricity, and then is discharged through the air venting pipeline of the expander. The inlet of the booster fan 2 is connected to the air venting pipeline, the purifier 1 has a regeneration gas inlet and a regeneration gas outlet, and the heat exchange unit 3 is connected in series between the outlet of the booster fan 2 and the regeneration gas inlet of the purifier 1.

[0050] During the energy release and power generation stage, part of the air after expansion and power generation is discharged through the air vent pipeline of the expander, and the other part is used as regeneration gas, which is pressurized by the booster fan 2 and flows to the subsequent heat exchange unit 3 and purifier 1, and is finally discharged through the regeneration gas outlet of the purifier 1.

[0051] The heat exchange unit 3 has heating and cooling functions for the air flowing through it; in actual operation, the heating function of the heat exchange unit 3 is first turned on, so that the heat exchange unit 3 is used to heat the air flowing to the purifier 1 into hot air, thereby achieving hot blowing of the adsorbent in the purifier 1, so that the impurities adsorbed by the adsorbent in the energy storage stage are desorbed and discharged with the hot air; then the heating function of the heat exchange unit 3 is turned off, and the cooling function is started, so that the heat exchange unit 3 is used to cool the air flowing to the purifier 1 into cold air, thereby achieving cold blowing of the adsorbent in the purifier 1, and continuing to take the desorbed impurities out of the purifier 1.

[0052] Therefore, the present application utilizes a purifier 1 to adsorb and purify the air during the daily energy storage stage, and then completes the activation and regeneration of the adsorbent during the daily energy release and power generation stage, so that the cycle of the purifier 1 from adsorption to completion of activation and regeneration in preparation for the next adsorption is one day, thereby effectively providing equipment utilization. At the same time, the regenerative hot blowing and regenerative cold blowing of the adsorbent are carried out continuously, so that the impurities desorbed from the adsorbent can be more thoroughly taken out of the purifier 1, ensuring that the adsorbent has good activity and service life after activation and regeneration. At the same time, the air sources for the regenerative hot blowing and regenerative cold blowing are both from the air expanded and generated by the expansion power generation system. When the booster fan 2 is working, it only needs to consider the working condition of positive pressure air supply, so that the inlet of the booster fan 2 has a stable working condition, thereby ensuring the working stability of the booster fan 2, and can simplify the piping of the booster fan 2 to a certain extent.

[0053] At the same time, the existing scheme for activating and regenerating the adsorbent is to use the liquid air flash vapor of the air liquefaction system as the gas source for the regeneration cold blow during the energy storage stage; while in the present application, the liquid air flash vapor from the air liquefaction system during the energy storage stage is no longer used for the regeneration cold blow gas, but is returned to the raw air intake port and incorporated into the raw air. Since the impurities such as moisture and carbon dioxide in the liquid air flash vapor have been removed to a qualified level, the content of impurities such as moisture and carbon dioxide in the raw gas can be reduced, thereby reducing the compression work of the raw gas and the adsorption consumption of the purifier.

[0054] In this embodiment, valves are provided on the inlet and outlet pipelines of the purifier 1 which are connected in series to the air boosting system. Valve are also provided on the regeneration gas inlet pipeline and the regeneration gas outlet pipeline of the purifier 1, respectively. Thus, in the energy storage stage, the regeneration gas path of the purifier 1 can be cut off, and in the power generation stage, the purified air path of the purifier 1 can be switched to ensure that the purification process and the activation regeneration process do not affect each other.

[0055] In one embodiment of the present application, preferably, the heat exchange unit 3 includes a heater 4 and a cooler, and the heater 4 and the cooler are arranged in parallel. The air from the booster fan 2 can be heated by the heater 4 and then flow to the purifier 1 to regenerate the adsorbent by hot blowing. The air from the booster fan 2 can also be cooled by the cooler and then flow to the purifier 1 to regenerate the adsorbent by cold blowing.

[0056] Preferably, the heater 4 includes a third air channel and a third heat exchange channel. The third air channel is connected in series between the outlet of the booster fan 2 and the regeneration gas inlet of the purifier 1, so that the air pressurized by the booster fan 2 can flow to the purifier 1 through the air channel; the third heat exchange channel supplies heat fluid to heat the air flowing through the third air channel.

[0057] The hot fluid in the third heat exchange channel comes from the heat storage system of the liquefied air energy storage device.

[0058] Specifically, the liquefied air energy storage device includes a heat storage system, which includes a heating side and a cooling side. In the energy storage stage, the cooling side of the heat storage system operates, and the heat exchange medium in the heat storage system can exchange heat with the air in the air boosting system. The heat exchange medium absorbs heat to reduce the air temperature. In the energy release and power generation stage, the heating side of the heat storage system operates, and the heat exchange medium in the heat storage system can exchange heat with the air in the expansion power generation system. The heat exchange medium releases heat to increase the air temperature and increase the expansion power generation power.

[0059] The third heat exchange channel of the heater 4 is connected in series between the heating side inlet and outlet of the heat storage system, so that the heat exchange medium of the heat storage system can flow through the third heat exchange channel to heat the air flowing through the third air channel as a heat source.

[0060] In this embodiment, preferably, the cooler includes a primary cooler 5 and a secondary cooler 6 connected in series, so that when the adsorbent is regenerated and cooled, the air pressurized by the booster fan 2 can first enter the primary cooler 5 for primary cooling, and then enter the secondary cooler 6 for secondary cooling, so that the air for regeneration and cooling can be reduced to a sufficiently low temperature, so that the temperature of the purifier 1 and the adsorbent therein can be close to the temperature of the air passing through during the energy storage stage, or even lower.

[0061] In this embodiment, preferably, the primary cooler 5 includes a first air channel and a first heat exchange channel, the secondary cooler 6 includes a second air channel and a second heat exchange channel, and the first air channel and the second air channel are connected in series between the outlet of the booster fan 2 and the inlet of the purifier 1 in sequence, that is, when the adsorbent is regenerated and cold-blown, the air pressurized by the booster fan 2 can flow through the first air channel and the second air channel in turn, and then flow into the purifier 1.

[0062] The first heat exchange channel is connected in series between the inlet and outlet of the refrigeration side of the heat storage system, so that the heat exchange medium of the heat storage system can flow through the first heat exchange channel to cool the air flowing through the first air channel as a cold source.

[0063] In this embodiment, preferably, the air purification system also includes a cold water unit, and the second heat exchange channel is connected in series between the inlet and the outlet of the cold water unit, so that the cold water in the cooling unit can flow through the second heat exchange channel to serve as a cold source to cool the air flowing through the second air channel, so that the regenerated gas used for regeneration cold blowing can first be cooled once by the primary cooler 5, and then cooled for the second time by cold water in the secondary cooling bin to ensure that the regenerated gas can be cooled to the required temperature.

[0064] In this embodiment, valves are provided at the entrances of the third air passage of the heater 4 and the first air passage of the primary cooler 5 to enable switching between the heating function and the cooling function of the heat exchange unit 3 .

[0065] In one embodiment of the present application, preferably, the air boosting system includes a primary compression unit and a secondary compression unit connected in series, and the purifier 1 is connected in series between the primary compression unit and the secondary compression unit, so that the compressed air enters the purifier 1 after being pressurized and cooled by the primary compression unit, so as to facilitate the adsorption of impurities in the air by the adsorbent. The purified air returns to the secondary compression unit, is further pressurized and cooled by the secondary compression unit, and is sent to the air liquefaction system.

[0066] In this embodiment, preferably, both the primary compression unit and the secondary compression unit include a compression chamber machine, a first cooler is provided downstream of both the primary compression unit and the secondary compression unit, and a second cooler is also provided downstream of the first cooler of the primary compression unit.

[0067] For the first cooler of the primary compression unit and the secondary compression unit, the hot fluid side is provided for air circulation, and the cold fluid side is connected in series between the inlet and outlet of the refrigeration side of the heat storage system, so as to utilize the heat exchange medium air of the heat storage system for heat exchange and absorb the heat of the air during the energy storage stage.

[0068] For the second cooler of the first-stage compression unit, its hot fluid side is used for air circulation, and its cold fluid side is connected in series between the inlet and outlet of the water cooling unit to utilize the water cooling unit to further cool the air flowing through the second cooler. On the one hand, low air temperature is beneficial to adsorption and can reduce the workload of the purifier. On the other hand, it can reduce the temperature of the air secondary compression inlet, thereby reducing the compression work of the air secondary compression.

[0069] In one embodiment of the present application, preferably, the air purification system also includes an air storage tank 7, which is connected to the outlet of the air boosting system (specifically, connected to the outlet of the secondary compression unit of the air boosting system). At the same time, the air storage tank 7 is connected to the purifier 1 through the first pressure control valve 8, and the purifier 1 is connected to a pressure relief pipeline, and a second pressure control valve 9 is installed on the pressure relief pipeline.

[0070] A valve is provided on the pipeline connecting the air storage tank 7 and the outlet of the secondary compression unit. When the valve is opened, the air with a relatively high pressure at the outlet of the secondary compression unit can be filled into the air storage tank 7 .

[0071] In the energy storage stage, when the purifier 1 purifies the air, the air from the first-stage compression unit is pressurized, so the purifier 1 can be pre-pressurized through the air storage tank 7 before the start of the energy storage stage, and the pre-pressurized pressure can be adjusted through the first pressure control valve 8. Then, at the end of the energy storage stage, after the purifier 1 completes the purification of the air, the purifier 1 can be depressurized through the first pressure air valve to facilitate the subsequent regeneration of the adsorbent in the purifier 1. Hot blowing and regeneration cold blowing.

[0072] The present application also provides a liquefied air energy storage device, comprising the air purification system of any of the above embodiments.

[0073] In this embodiment, the liquefied air energy storage device includes an air purification system, so the liquefied air energy storage device has all the beneficial effects of the air purification system, which will not be described in detail here.

[0074] 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 replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An air purification system, characterized in that: Includes purifier, heat exchange unit and booster fan; The purifier is filled with an adsorbent, and the purifier is used to be connected in series to the air boosting system of the liquefied air energy storage device to purify the air flowing through; The purifier is provided with a regeneration gas inlet and a regeneration gas outlet. The heat exchange unit is connected in series between the outlet of the booster fan and the regeneration gas inlet of the purifier. The inlet of the booster fan is connected to the air discharge pipeline of the expansion power generation system of the liquefied air energy storage device. The heat exchange unit has heating and cooling functions for the air flowing through.

2. The air purification system according to claim 1, characterized in that: The heat exchange unit includes a heater and a cooler; The heater and the cooler are arranged in parallel, and the air pressurized by the booster fan can flow to the purifier after being heated by the heater, or flow to the purifier after being cooled by the cooler.

3. The air purification system according to claim 2, characterized in that: The heater comprises a third air channel and a third heat exchange channel; The third air channel is connected in series between the booster fan and the purifier; The liquefied air energy storage device includes a heat storage system, which includes a heating side. The third heat exchange channel is connected in series between the inlet and outlet of the heating side. The heat exchange medium in the heat storage system can flow through the third heat exchange channel to serve as a heat source to heat the air flowing through the third air channel.

4. The air purification system according to claim 3, characterized in that: The cooler comprises a primary cooler and a secondary cooler connected in series, and the air pressurized by the booster fan can be cooled in the primary cooler and the secondary cooler in sequence and then flow to the purifier.

5. The air purification system according to claim 4, characterized in that: The primary cooler comprises a first air channel and a first heat exchange channel; The first air channel is connected in series between the booster fan and the purifier; The heat storage system includes a refrigeration side, the first heat exchange channel is connected in series between the inlet and outlet of the refrigeration side, and the heat exchange medium in the heat storage system can flow through the first heat exchange channel to serve as a cold source to cool the air flowing through the first air channel.

6. The air purification system according to claim 5, characterized in that: The secondary cooler includes a second air channel and a second heat exchange channel; The second air channel is connected in series between the first air channel and the purifier; The air purification system also includes a cold water unit, and the second heat exchange channel is connected in series between the inlet and outlet of the cold water unit. The cold water in the cold water unit can flow through the second heat exchange channel to serve as a cold source to cool the air flowing through the second air channel.

7. The air purification system according to claim 6, characterized in that: The air boosting system comprises a primary compression unit and a secondary compression unit connected in series; The purifier is connected in series between the primary compression unit and the secondary compression unit.

8. The air purification system according to claim 7, characterized in that: The primary compression unit comprises a compressor, a first cooler and a second cooler connected in series, and air from the compressor flows through the hot fluid sides of the first cooler and the second cooler in sequence; The cold fluid side of the first cooler is connected in series between the inlet and outlet of the refrigeration side of the heat storage system, and the cold fluid side of the second cooler is connected in series between the inlet and outlet of the cold water unit.

9. The air purification system according to claim 7, characterized in that: Also includes gas tanks; The gas storage tank is connected to the outlet of the secondary compression unit, and the gas storage tank is connected to the purifier through a first pressure control valve; The purifier is connected with a pressure relief pipeline, and a second pressure control valve is arranged on the pressure relief pipeline.

10. A liquefied air energy storage device, characterized in that: An air purification system comprising any one of claims 1 to 9.

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