A coupled thermochemical energy storage air carbon dioxide capture system and method

Abstract

The application discloses an air carbon dioxide capturing system and method coupled with thermochemical energy storage. The application adopts an air carbon dioxide capturing device and a thermochemical energy storage device; in the air carbon dioxide capturing stage, ambient air passes through the air carbon dioxide capturing device, carbon dioxide reacts with the adsorption medium, after fixing the carbon dioxide, the remaining air passes through the thermochemical energy storage device, oxygen reacts with the thermochemical energy storage medium to release energy; in the air carbon dioxide releasing stage, the adsorption medium is heated by the energy released by the thermochemical energy storage device to release carbon dioxide, and the thermochemical energy storage device stores energy by electric heating. The application combines the air carbon dioxide capturing process requiring a large amount of air supply and the thermochemical energy storage process, can reduce the number of fans required by the system and the operation energy consumption, solves the energy supply problem required by the release of the fixed carbon dioxide and the regeneration of the capturing material, and simultaneously can co-produce high-purity carbon dioxide and high-purity oxygen.

Description

Technical Field

[0001] This invention relates to the fields of energy storage and greenhouse gas emission reduction technology, specifically to an air carbon dioxide capture system and method coupled with thermochemical energy storage. Background Technology

[0002] Currently, the main technologies for capturing carbon dioxide in the air include liquid absorption and solid adsorption. Liquid absorption technology is relatively mature, but it suffers from high energy consumption, degradation of the absorbent, and solvent loss due to evaporation during operation. In contrast, solid adsorption reduces the latent heat of heating the absorbent solution, significantly lowering the heat consumption level of the capture cycle. It also has obvious advantages in reducing equipment corrosion and resisting degradation.

[0003] The high energy consumption of air carbon dioxide capture technology is one of the major factors restricting its large-scale development. On the one hand, the concentration of carbon dioxide in the air is only 0.04%, requiring a large volume of air for capture. The energy consumption of the fans driving the air into the carbon dioxide capture reactor is high, typically accounting for 70% to 80% of the total electricity consumption. On the other hand, air carbon dioxide adsorbents, represented by solid amine-based materials, require heating to regenerate the material and enrich the carbon dioxide. Compared to fossil fuel power plants, where the heat required for carbon dioxide capture from flue gas can be directly extracted from the power plant itself, the high heat consumption of air carbon dioxide necessitates a high-quality, stable external heating system.

[0004] Thermochemical energy storage technology utilizes reversible chemical reactions to store and release heat. Its energy storage density is an order of magnitude higher than conventional sensible heat storage technology. The stored and released temperatures are relatively stable and concentrated, facilitating long-term storage or long-distance transportation. Furthermore, it is safe, non-toxic, and uses inexpensive minerals as raw materials, resulting in low cost and significant research and application potential. However, thermochemical energy storage technology based on metal oxides, similar to carbon dioxide air technology, requires fans to drive large volumes of air for heat exchange and reaction during the storage / release process, leading to higher energy consumption.

[0005] Therefore, providing systems and methods that combine thermochemical energy storage with air carbon dioxide capture has become a pressing technical challenge in this field. Summary of the Invention

[0006] To overcome the shortcomings of the existing technology, the present invention provides an air carbon dioxide capture system and method coupled with thermochemical energy storage, so as to reduce the number of fans required by the system and the energy consumption of operation, solve the energy supply problem required for the release of air carbon dioxide after fixation, and simultaneously produce high-purity carbon dioxide and high-purity oxygen.

[0007] Therefore, one technical solution adopted by the present invention is: an air carbon dioxide capture system coupled with thermochemical energy storage, which includes an air carbon dioxide capture device and a thermochemical energy storage device.

[0008] The aforementioned air carbon dioxide capture device includes an air fan, an air carbon dioxide capture unit, a carbon dioxide compressor, a carbon dioxide condenser, and a carbon dioxide storage tank connected in sequence. The gas outlet of the carbon dioxide storage tank is connected to the gas inlet of the air carbon dioxide capture unit via a pipeline, which is equipped with a carbon dioxide inlet valve and a carbon dioxide pressure reducing valve. The gas inlet of the air carbon dioxide capture unit is connected to the air fan via a pipeline, which is equipped with an air inlet valve. The gas outlet of the air carbon dioxide capture unit is connected to the gas inlet of the carbon dioxide storage tank via a pipeline, which is equipped with a carbon dioxide outlet valve.

[0009] The thermochemical energy storage device includes a thermochemical energy storage reactor, an electric heater, an oxygen compressor, an oxygen condenser, an oxygen storage tank, and a heat exchanger, wherein the electric heater is installed on the thermochemical energy storage reactor;

[0010] The gas inlet of the thermochemical energy storage reactor is connected to the gas outlet of the air carbon dioxide trap via a pipeline, and an air connection valve is installed on the pipeline; the gas outlet of the thermochemical energy storage reactor is connected to the oxygen storage tank via a pipeline, and an oxygen outlet valve, an oxygen compressor, and an oxygen condenser are installed sequentially on the pipeline.

[0011] The gas outlet of the thermochemical energy storage reactor is connected to the gas inlet of the heat exchanger via a pipeline, and an air outlet valve is installed on the pipeline; the steam outlet of the heat exchanger is connected to the steam inlet of the air carbon dioxide trap via a pipeline, and a steam inlet valve is installed on the pipeline.

[0012] Furthermore, the air carbon dioxide trap includes a first air carbon dioxide trap and a second air carbon dioxide trap, which are connected in parallel.

[0013] Furthermore, both the first and second air carbon dioxide traps are equipped with steam inlets and steam outlets.

[0014] Furthermore, the pipeline connecting the gas outlet of the air carbon dioxide trap to the gas inlet of the carbon dioxide storage tank is sequentially equipped with a carbon dioxide outlet valve, a carbon dioxide compressor, and a carbon dioxide condenser.

[0015] Furthermore, the thermochemical energy storage reactor includes a first thermochemical energy storage reactor and a second thermochemical energy storage reactor, which are connected in parallel.

[0016] Furthermore, both thermochemical energy storage reactors are equipped with electric heaters and connected to the power grid.

[0017] Furthermore, the liquid inlet of the heat exchanger is connected to the water supply network, and a steam bypass is provided on the pipe connecting the steam outlet of the heat exchanger to the steam inlet of the air carbon dioxide trap.

[0018] Furthermore, the gas outlet of the heat exchanger is vented.

[0019] Furthermore, the adsorption medium in the air carbon dioxide trap is one of the following: amine-supported silica, amine-supported alumina, amine-supported porous carbon, amine-supported cellulose, amine-supported porous resin, and amine-supported organometallic framework.

[0020] The energy storage medium in the thermochemical energy storage reactor is a composite oxide formed by combining one or more of the following: cobalt-based oxide, manganese-based oxide, copper-based oxide, iron-based oxide, and barium-based oxide.

[0021] Another technical solution adopted in this invention is: a method for capturing carbon dioxide in air coupled with thermochemical energy storage, using the aforementioned system for capturing carbon dioxide in air coupled with thermochemical energy storage, comprising the following steps:

[0022] S1. Open the air inlet valve, air connection valve and air outlet valve, start the air fan, and the air enters the air carbon dioxide trap. The carbon dioxide in the trap is fixed by the adsorption medium in the air carbon dioxide trap. The remaining gas is passed through the air connection valve into the thermochemical energy storage reactor. The exhaust gas is passed through the air outlet valve into the heat exchanger and discharged from the gas outlet of the heat exchanger.

[0023] S2. Turn off the air blower, close the air inlet valve, air connection valve, and air outlet valve, open the oxygen outlet valve, start the electric heater on the thermochemical energy storage reactor to heat the thermochemical energy storage medium to store energy; start the oxygen compressor, the oxygen released by the thermochemical energy storage medium is introduced into the oxygen compressor through the oxygen outlet valve, and the compressed oxygen is cooled by the oxygen condenser and then introduced into the oxygen storage tank; when the oxygen release flow rate is zero, turn off the oxygen compressor and close the oxygen outlet valve.

[0024] S3. Open the air inlet valve, air connecting valve, and air outlet valve, start the air fan, and open the steam inlet valve. Air is introduced into the air carbon dioxide trap, where the carbon dioxide is fixed by the adsorption medium in the air carbon dioxide trap. The remaining gas is introduced into the thermochemical energy storage reactor through the air connecting valve. The oxygen in the gas reacts with the thermochemical energy storage medium in the thermochemical energy storage reactor to release heat. The heated high-temperature exhaust gas is introduced into the heat exchanger through the air outlet valve to heat the tap water from the water supply network to form high-temperature steam. Part of the steam is supplied to the heat users through the steam bypass, and part of the steam enters the air carbon dioxide trap through the steam inlet valve to heat the adsorption medium that has fixed the carbon dioxide. The low-temperature exhaust gas after heat exchange is discharged into the air.

[0025] S4. While operating in S3, open the carbon dioxide inlet valve, carbon dioxide outlet valve and carbon dioxide pressure reducing valve, and turn on the carbon dioxide compressor. After the high-pressure carbon dioxide is reduced by the carbon dioxide pressure reducing valve, it is introduced into the air carbon dioxide reactor to purge the adsorption medium. After the carbon dioxide fixed in the adsorption medium is released, it is introduced into the carbon dioxide compressor through the carbon dioxide outlet valve. After the compressed carbon dioxide is cooled by the carbon dioxide condenser, it is introduced into the carbon dioxide storage tank.

[0026] S5. Repeat operations S2-S4 to form a continuous loop.

[0027] The beneficial effects of this invention are as follows:

[0028] 1. The air carbon dioxide capture process requires a huge volume of air, and the fans that drive the air into the carbon dioxide capture reactor consume a lot of energy. The exhaust air has a certain amount of kinetic energy, which can be used in the thermochemical energy storage process that requires a large amount of air. Combining the two can effectively reduce the number of fans required and the energy consumption of the fans.

[0029] 2. Combining air carbon dioxide capture with thermochemical energy storage, using thermochemical energy storage to provide the required heat, can further improve the flexibility of air carbon dioxide application. At the same time, thermochemical energy storage helps with green electricity consumption and grid peak-valley regulation.

[0030] 3. By combining thermochemical energy storage with air carbon dioxide capture, high-purity carbon dioxide (>99%) and high-purity oxygen (>99%) can be extracted from air feedstock, realizing the resource utilization of air. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a structural block diagram of an air carbon dioxide capture system coupled with thermochemical energy storage according to the present invention;

[0033] The components include: 1. Air fan; 2. First air carbon dioxide trap; 3. Second air carbon dioxide trap; 4. Carbon dioxide compressor; 5. Carbon dioxide condenser; 6. Carbon dioxide storage tank; 7. First air inlet valve; 8. Second air inlet valve; 9. First carbon dioxide inlet valve; 10. Second carbon dioxide inlet valve; 11. First carbon dioxide outlet valve; 12. Second carbon dioxide outlet valve; 13. Carbon dioxide pressure reducing valve; 14. First thermochemical storage reactor; 15. Second thermochemical storage reactor; 16. First electric heater; 17. Second electric heater; 18. Power grid; 19. Oxygen compressor; 20. Oxygen condenser; 21. Oxygen storage tank; 22. Heat exchanger; 23. First air connecting valve; 24. Second air connecting valve; 25. First air outlet valve; 26. Second air outlet valve; 27. First oxygen outlet valve; 28. Second oxygen outlet valve; 29. ​​First steam inlet valve; 30. Second steam inlet valve. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Example 1

[0036] Please see the appendix Figure 1 This is a schematic diagram of an air carbon dioxide capture system coupled with thermochemical energy storage, which consists of an air carbon dioxide capture device and a thermochemical energy storage device.

[0037] The aforementioned air carbon dioxide capture device includes an air fan 1, an air carbon dioxide capture unit, a carbon dioxide compressor 4, a carbon dioxide condenser 5, and a carbon dioxide storage tank 6 connected in sequence.

[0038] The thermochemical energy storage device includes a thermochemical energy storage reactor, an electric heater, an oxygen compressor 19, an oxygen condenser 20, an oxygen storage tank 21, and a heat exchanger 22.

[0039] The aforementioned air carbon dioxide trap includes a first air carbon dioxide trap 2 and a second air carbon dioxide trap 3, which are connected in parallel. Both the first air carbon dioxide trap 2 and the second air carbon dioxide trap 3 are provided with a steam inlet and a steam outlet.

[0040] The first air carbon dioxide trap 2 is connected to the air fan 1 through a pipe, and the pipe is equipped with a first air inlet valve 7; the second air carbon dioxide trap 3 is connected to the air fan 1 through a pipe, and the pipe is equipped with a second air inlet valve 8.

[0041] The gas outlets of the first air-carbon dioxide trap 2 and the second air-carbon dioxide trap 3 are both connected to the gas inlet of the carbon dioxide storage tank 6 via pipelines. A carbon dioxide compressor 4 and a carbon dioxide condenser 5 are installed on the pipelines. A first carbon dioxide outlet valve 11 and a second carbon dioxide outlet valve 12 are respectively installed on the pipelines connecting the gas outlets of the first air-carbon dioxide trap 2 and the gas outlets of the second air-carbon dioxide trap 3 to the carbon dioxide compressor 4.

[0042] The carbon dioxide inlet of the first air carbon dioxide trap 2 and the carbon dioxide inlet of the second air carbon dioxide trap 3 are both connected to the gas outlet of the carbon dioxide storage tank 6 via pipelines, and carbon dioxide pressure reducing valves 13 are installed on the pipelines. A first carbon dioxide inlet valve 9 and a second carbon dioxide inlet valve 10 are respectively installed on the pipelines connecting the carbon dioxide inlets of the first air carbon dioxide trap 2 and the carbon dioxide inlets of the second air carbon dioxide trap 3 to the carbon dioxide pressure reducing valves 13.

[0043] The adsorption medium in the air carbon dioxide trap is one of the following: amine-supported silica, amine-supported alumina, amine-supported porous carbon, amine-supported cellulose, amine-supported porous resin, and amine-supported organometallic framework.

[0044] The thermochemical energy storage reactor includes a first thermochemical energy storage reactor 14 and a second thermochemical energy storage reactor 15, which are connected in parallel. The first thermochemical energy storage reactor 14 is equipped with a first electric heater 16, and the second thermochemical energy storage reactor 15 is equipped with a second electric heater 17, both of which are connected to the power grid 18.

[0045] The gas inlet of the first thermochemical storage reactor 14 is connected to the gas outlet of the first air carbon dioxide trap 2 via a pipeline, and a first air connection valve 23 is installed on the pipeline. The gas inlet of the second thermochemical storage reactor 15 is connected to the gas outlet of the second air carbon dioxide trap 3 via a pipeline, and a second air connection valve 24 is installed on the pipeline.

[0046] The gas outlets of the first thermochemical storage reactor 14 and the second thermochemical storage reactor 15 are both connected to the oxygen storage tank 21 via pipelines. An oxygen compressor 19 and an oxygen condenser 20 are installed on the pipelines. A first oxygen outlet valve 27 and a second oxygen outlet valve 28 are respectively installed on the pipelines connecting the gas outlets of the first thermochemical storage reactor 14 and the second thermochemical storage reactor 15 to the oxygen compressor 19.

[0047] The gas outlets of the first thermochemical storage reactor 14 and the second thermochemical storage reactor 15 are both connected to the gas inlet of the heat exchanger 22 via pipelines, and the pipelines are respectively equipped with a first air outlet valve 25 and a second air outlet valve 26.

[0048] The energy storage medium in the thermochemical energy storage reactor is a composite oxide formed by combining one or more of the following: cobalt-based oxide, manganese-based oxide, copper-based oxide, iron-based oxide, and barium-based oxide.

[0049] The liquid inlet of heat exchanger 22 is connected to the water supply network, and the steam outlet of heat exchanger 22 is connected to the steam inlet of the first air carbon dioxide trap 2 and the steam inlet of the second air carbon dioxide trap 3 via pipelines. The pipelines are equipped with a first steam inlet valve 29 and a second steam inlet valve 30, respectively. The steam outlet of heat exchanger 22 can also supply heat to the outside through a steam bypass.

[0050] Example 2

[0051] This embodiment provides a method for capturing carbon dioxide in the air coupled with thermochemical energy storage, which uses the air carbon dioxide capture system coupled with thermochemical energy storage described in Embodiment 1, and includes the following steps:

[0052] S1. Open the first air inlet valve 7, the first air connecting valve 23 and the first air outlet valve 25, start the air fan 1, and let the air into the first air carbon dioxide trap 2. The carbon dioxide in the trap is fixed by the adsorption medium in the first air carbon dioxide trap 2. The remaining gas is passed through the first air connecting valve 23 into the first thermochemical energy storage reactor 14. The exhaust gas is passed through the first air outlet valve 25 into the heat exchanger 22 and discharged from the gas outlet of the heat exchanger 22.

[0053] S2. Simultaneously with operation S1, open the second oxygen outlet valve 28 and start the second electric heater 17 on the second thermochemical energy storage reactor 15 to heat the thermochemical energy storage medium for energy storage. Start the oxygen compressor 19; oxygen released from the thermochemical energy storage medium is introduced into the oxygen compressor 19 via the second oxygen outlet valve 28. The compressed oxygen is cooled by the oxygen condenser 20 and then introduced into the oxygen storage tank 21. When the oxygen release flow rate is zero, shut down the oxygen compressor 19 and close the second oxygen outlet valve 28.

[0054] S3. Open the second air inlet valve 8, the second air connecting valve 24, and the second air outlet valve 26. Open the first steam inlet valve 29. Close the first air inlet valve 7, the first air connecting valve 23, and the first air outlet valve 25. Air is introduced into the second air carbon dioxide trap 3. The carbon dioxide in the trap is fixed by the adsorption medium in the trap. The remaining gas is introduced into the second thermochemical energy storage reactor 15 via the second air connecting valve 24. The oxygen in the reactor reacts with the thermochemical energy storage medium in the reactor to release heat. The heated high-temperature exhaust gas is introduced into the heat exchanger 22 via the second air outlet valve 26 to heat the tap water from the water supply network to form high-temperature steam. Part of the steam is supplied to the heat users via the steam bypass, and part of the steam enters the first air carbon dioxide trap 2 via the first steam inlet valve 29 to heat the adsorption medium that has fixed the carbon dioxide. The cooled exhaust gas after heat exchange is directly discharged into the air.

[0055] S4. While operating in S3, open the first carbon dioxide inlet valve 9, the first carbon dioxide outlet valve 11 and the carbon dioxide pressure reducing valve 13, and turn on the carbon dioxide compressor 4. After the high-pressure carbon dioxide is reduced by the carbon dioxide pressure reducing valve 13, it is introduced into the first air carbon dioxide trap 2 to purge the adsorption medium. After the carbon dioxide fixed in the adsorption medium is released, it is introduced into the carbon dioxide compressor 4 through the carbon dioxide outlet valve. After the compressed carbon dioxide is cooled by the carbon dioxide condenser 5, it is introduced into the carbon dioxide storage tank 6.

[0056] S5. Simultaneously with operation S4, open the first oxygen outlet valve 27 and start the first electric heater 16 on the first thermochemical energy storage reactor 14 to heat the thermochemical energy storage medium for energy storage. Start the oxygen compressor 19. Oxygen released from the thermochemical energy storage medium is fed into the oxygen compressor 19 through the first oxygen outlet valve 27. The compressed oxygen is cooled by the oxygen condenser 20 and then fed into the oxygen storage tank 21. When the oxygen release flow rate is zero, shut down the oxygen compressor 19 and close the first oxygen outlet valve 27.

[0057] S6. Open the first air inlet valve 7, the first air connecting valve 23 and the first air outlet valve 25, open the second steam inlet valve 30, and close the second air inlet valve 8, the second air connecting valve 24 and the second air outlet valve 26. Air is introduced into the first air carbon dioxide trap 2, where the carbon dioxide is fixed by the adsorption medium in the first air carbon dioxide trap 2. The remaining gas is introduced into the first thermochemical energy storage reactor 14 through the first air connecting valve 23. The oxygen in the reactor reacts with the thermochemical energy storage medium in the first thermochemical energy storage reactor 14 to release heat. The high-temperature exhaust gas after heating is introduced into the heat exchanger 22 through the first air outlet valve 25 to heat the tap water from the water supply network to form high-temperature steam. Part of the steam is supplied to the heat users through the steam bypass, and part of the steam enters the second air carbon dioxide trap 3 through the second steam inlet valve 30 to heat the adsorption medium that has fixed carbon dioxide. The low-temperature exhaust gas after heat exchange is directly discharged into the air.

[0058] S7. While performing operation S6, repeat operation S2;

[0059] S8. While performing operation S7, repeat operation S3;

[0060] S9. Repeat operations S2-S8 to form a continuous loop.

[0061] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An air carbon dioxide capture system coupled with thermochemical energy storage, characterized in that, The application relates to an air carbon dioxide capturing device and a thermochemical energy storage device. The air carbon dioxide capturing device comprises an air fan (1), an air carbon dioxide capturing device, a carbon dioxide compressor (4), a carbon dioxide condenser (5) and a carbon dioxide storage tank (6) which are sequentially connected; the gas outlet of the carbon dioxide storage tank (6) is connected with the gas inlet of the air carbon dioxide capturing device through a pipeline, the pipeline is provided with a carbon dioxide inlet valve and a carbon dioxide pressure reducing valve (13); the gas inlet of the air carbon dioxide capturing device is connected with the air fan (1) through a pipeline, the pipeline is provided with an air inlet valve; the gas outlet of the air carbon dioxide capturing device is connected with the gas inlet of the carbon dioxide storage tank (6) through a pipeline, and the pipeline is provided with a carbon dioxide outlet valve. The thermochemical energy storage device comprises a thermochemical energy storage reactor, an electric heater, an oxygen compressor (19), an oxygen condenser (20), an oxygen storage tank (21) and a heat exchanger (22), and the electric heater is arranged on the thermochemical energy storage reactor. The gas inlet of the thermochemical energy storage reactor is connected with the gas outlet of the air carbon dioxide capturing device through a pipeline, and the pipeline is provided with an air communication valve; the gas outlet of the thermochemical energy storage reactor is connected with the oxygen storage tank (21) through a pipeline, and the pipeline is sequentially provided with an oxygen outlet valve, the oxygen compressor (19) and the oxygen condenser (20). The gas outlet of the thermochemical energy storage reactor is connected with the gas inlet of the heat exchanger (22) through a pipeline, and the pipeline is provided with an air outlet valve; the steam outlet of the heat exchanger (22) is connected with the steam inlet of the air carbon dioxide capturing device through a pipeline, and the pipeline is provided with a steam inlet valve. The energy storage medium in the thermochemical energy storage reactor is a composite oxide formed by one or more of cobalt-based oxides, manganese-based oxides, copper-based oxides, iron-based oxides and barium-based oxides.

2. The coupled thermochemical energy storage air carbon dioxide capture system of claim 1, wherein, The air carbon dioxide capturing device comprises a first air carbon dioxide capturing device (2) and a second air carbon dioxide capturing device (3) which are connected in parallel.

3. The coupled thermochemical energy storage air carbon dioxide capture system of claim 2, wherein, The first air carbon dioxide capturing device (2) and the second air carbon dioxide capturing device (3) are both provided with steam inlets and steam outlets.

4. The coupled thermochemical energy storage air carbon dioxide capture system of any one of claims 1-3, wherein, The pipeline, through which the gas outlet of the air carbon dioxide capturing device is connected with the gas inlet of the carbon dioxide storage tank (6), is sequentially provided with a carbon dioxide outlet valve, the carbon dioxide compressor (4) and the carbon dioxide condenser (5).

5. The coupled thermochemical energy storage air carbon dioxide capture system of any one of claims 1-3, wherein, The thermochemical energy storage device comprises a first thermochemical energy storage reactor (14) and a second thermochemical energy storage reactor (15) which are connected in parallel.

6. The coupled thermochemical energy storage air carbon dioxide capture system of claim 5, wherein, The two thermochemical energy storage reactors are both provided with electric heaters which are connected with an electric network.

7. The coupled thermochemical energy storage air carbon dioxide capture system of any one of claims 1-3, wherein, The liquid inlet of the heat exchanger (22) is connected with a water supply pipeline network, and the pipeline, through which the steam outlet of the heat exchanger (22) is connected with the steam inlet of the air carbon dioxide capturing device, is provided with a steam bypass.

8. The coupled thermochemical energy storage air carbon dioxide capture system of any one of claims 1-3, wherein, The gas outlet of the heat exchanger (22) is empty.

9. The coupled thermochemical energy storage air carbon dioxide capture system of claim 1, wherein, The adsorption medium in the air carbon dioxide capturing device is one of amine group loaded silica, amine group loaded alumina, amine group loaded porous carbon, amine group loaded cellulose, amine group loaded porous resin and amine group loaded organic metal framework.

10. A method of air carbon dioxide capture coupled with thermochemical energy storage, using the system of air carbon dioxide capture coupled with thermochemical energy storage according to any one of claims 1 to 9, characterized in that, The method comprises the following steps: S1, open the air inlet valve, air communication valve and air outlet valve, start the air blower, air into the air carbon dioxide trap, the carbon dioxide is fixed by the adsorption medium in the air carbon dioxide trap, the remaining gas is passed through the air communication valve into the thermo-chemical energy storage reactor, the exhaust gas is passed through the air outlet valve into the heat exchanger, and the gas is discharged from the gas outlet of the heat exchanger; S2, close the air blower, close the air inlet valve, air communication valve and air outlet valve, open the oxygen outlet valve, start the electric heater on the thermo-chemical energy storage reactor, heat the thermo-chemical energy storage medium to store energy; Start the oxygen compressor, the thermo-chemical energy storage medium releases oxygen which is passed through the oxygen outlet valve into the oxygen compressor, and the compressed oxygen is cooled by the oxygen condenser and then passed into the oxygen storage tank; When the oxygen release flow is equal to zero, the oxygen compressor is stopped, and the oxygen outlet valve is closed; S3, open the air inlet valve, air communication valve and air outlet valve, start the air blower, open the steam inlet valve, air into the air carbon dioxide trap, the carbon dioxide is fixed by the adsorption medium in the air carbon dioxide trap, the remaining gas is passed through the air communication valve into the thermo-chemical energy storage reactor, the oxygen in the reactor reacts with the thermo-chemical energy storage medium to release heat, the high-temperature exhaust gas after heating is passed through the air outlet valve into the heat exchanger, the tap water from the water supply network is heated to form high-temperature steam, a part of which is supplied to the heat user through the steam bypass, and a part is passed through the steam inlet valve into the air carbon dioxide trap to heat the adsorption medium which has fixed the carbon dioxide, and the low-temperature exhaust gas after heat exchange is discharged; S4, at the same time as the operation of S3, open the carbon dioxide inlet valve, carbon dioxide outlet valve and carbon dioxide pressure reducing valve, open the carbon dioxide compressor, high-pressure carbon dioxide is reduced through the carbon dioxide pressure reducing valve, then passed into the air carbon dioxide reactor to purge the adsorption medium, after the fixed carbon dioxide of the adsorption medium is released, it is passed through the carbon dioxide outlet valve into the carbon dioxide compressor, and the compressed carbon dioxide is cooled by the carbon dioxide condenser and then passed into the carbon dioxide storage tank; S5, repeat the operations of S2-S4 to form a continuous cycle.

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