Carbon dioxide capture system

Abstract

This invention relates to the field of carbon dioxide technology. The carbon dioxide capture system of this invention includes an adsorption tower having a first inlet, a second inlet, a first outlet, and a second outlet. The adsorption tower sequentially switches between an adsorption state, a regeneration state, and a cold-blowing state. In the adsorption state, the first inlet is connected to an air source, and air passing through the adsorbent flows out from the first outlet. In the regeneration state, the second inlet is connected to a regeneration gas source, and the regeneration gas regenerates the adsorbent to release the adsorbed carbon dioxide, which then flows to a separation unit from the second outlet. In the cold-blowing state, the second inlet is connected to an air source, and air passing through the adsorbent flows from the second outlet to the first inlet of the adsorption tower in the adsorption state. There are at least three adsorption towers, with at least one adsorption tower in the adsorption state, at least another adsorption tower in the regeneration state, and at least one adsorption tower in the cold-blowing state. The carbon dioxide capture system of this invention can improve carbon dioxide capture efficiency.

Description

Technical Field

[0001] This invention relates to the field of carbon dioxide technology, and more specifically, to a carbon dioxide capture system. Background Technology

[0002] With the rapid development of the carbon dioxide capture industry, directly capturing carbon dioxide from the air has become a key technological path for carbon neutrality. However, in related technologies, the adsorbent has a limited adsorption capacity, and after adsorbing a certain amount of carbon dioxide, the adsorbent needs to be regenerated, resulting in low carbon dioxide capture efficiency. Summary of the Invention

[0003] This invention aims to at least partially address one of the technical problems in related technologies. To this end, embodiments of this invention propose a carbon dioxide capture system that can improve carbon dioxide capture efficiency.

[0004] The carbon dioxide capture system of this invention includes an adsorption tower having a first inlet, a second inlet, a first outlet, and a second outlet. The adsorption tower has an adsorption state, a regeneration state, and a cold-blowing state, and sequentially switches between these states. In the adsorption state, the first inlet is adapted to be connected to an air source to deliver air into the adsorption tower, where an adsorbent adsorbs carbon dioxide from the air, and the air after passing through the adsorbent flows out from the first outlet. In the regeneration state, the second inlet is adapted to be connected to a regeneration gas source to deliver regeneration gas into the adsorption tower, where the regeneration gas further adsorbs carbon dioxide from the air. The adsorbent is regenerated to release the carbon dioxide adsorbed by the adsorbent. The mixed gas formed by the carbon dioxide and the regenerated gas after passing through the adsorbent flows from the second outlet to the separation unit. In the cold blowing state, the second inlet is connected to the air source to deliver air to the adsorption tower to cool the adsorbent. The air after passing through the adsorbent flows from the second outlet to the first inlet of the adsorption tower in the adsorption state. There are at least three adsorption towers. At least one of the at least three adsorption towers is in the adsorption state, at least another of the at least three adsorption towers is in the regeneration state, and at least another of the at least three adsorption towers is in the cold blowing state.

[0005] The carbon dioxide capture system of this invention sets up at least three adsorption towers, with at least one adsorption tower in an adsorption state, at least one adsorption tower in a regeneration state, and at least one adsorption tower in a cold blowing state. This allows some adsorption towers to continuously capture carbon dioxide from the air while the adsorbent in other adsorption towers is regenerated, thereby achieving continuous capture of carbon dioxide from the air and improving the capture efficiency. Moreover, this embodiment can directly reduce the carbon dioxide content in the air by capturing carbon dioxide directly from the air, achieving a negative carbon emissions level. Furthermore, the carbon dioxide capture system of this embodiment has a simple structure, low cost, and strong applicability.

[0006] In some embodiments, the carbon dioxide capture system further includes a compressor, one end of which is connected to the air source, the other end of which is connected to the first inlet of the adsorption tower in the adsorption state, and the other end of which is connected to the second inlet of the adsorption tower in the cold blowing state.

[0007] In some embodiments, the carbon dioxide capture system further includes a pre-dryer, one end of which is connected to the other end of the compressor, and the other end of which is connected to the first inlet of the adsorption tower in the adsorption state. In the cold blowing state, the other end of the pre-dryer is connected to the second inlet of the adsorption tower in the cold blowing state.

[0008] In some embodiments, the airflow rate when the other end of the pre-dryer is connected to the second inlet is less than the airflow rate when the other end of the pre-dryer is connected to the first inlet.

[0009] In some embodiments, the airflow rate when the other end of the pre-dryer is connected to the second inlet is 30% of the airflow rate when the other end of the pre-dryer is connected to the first inlet.

[0010] In some embodiments, the separation unit includes a regenerated gas cooler and a gas-liquid separator. The regenerated gas cooler has a first opening, a second opening, a third opening, and a fourth opening. In the regeneration state, the first opening is connected to the second outlet, the second opening is connected to the inlet of the gas-liquid separator, the third opening is connected to the liquid outlet of the gas-liquid separator, and the fourth opening is connected to the second inlet. The gas outlet of the gas-liquid separator is used to output the carbon dioxide separated by the gas-liquid separator.

[0011] In some embodiments, the carbon dioxide capture system further includes a heat pump, one end of which is connected to the fourth opening and the other end of which is connected to the second inlet of the adsorption tower in the regeneration state.

[0012] In some embodiments, the carbon dioxide capture system further includes a regenerating steam heater, one end of which is connected to the other end of the heat pump, and the other end of which is connected to the second inlet of the adsorption tower in the regeneration state.

[0013] In some embodiments, the carbon dioxide capture system further includes a photovoltaic module connected to the heat pump for supplying energy to the heat pump.

[0014] In some embodiments, the carbon dioxide capture system further includes a post-filter. In the adsorption state, the first outlet is connected to the post-filter to filter the adsorbent in the air flowing out of the first outlet, and the air filtered by the post-filter is discharged to the outside. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a carbon dioxide capture system according to an embodiment of the present invention.

[0016] Figure label:

[0017] Adsorption tower 1, first inlet 11, second inlet 12, first outlet 13, second outlet 14. Compressor 2, Pre-dryer 3, Separation unit 4, regeneration gas cooler 41, first opening 411, second opening 412, third opening 413, fourth opening 414. Gas-liquid separator 42, gas-liquid separator inlet 421, gas-liquid separator liquid outlet 422, gas-liquid separator gas outlet 423. Heat pump 5, Regenerated steam heater 6, Photovoltaic module 7, Post-filter 8. Detailed Implementation

[0018] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0019] The following is in conjunction with the appendix Figure 1 The carbon dioxide capture system of this invention will be described in detail.

[0020] The carbon dioxide capture system of this invention includes an adsorption tower 1, which has a first inlet 11, a second inlet 12, a first outlet 13, and a second outlet 14. The adsorption tower 1 has adsorption, regeneration, and cold-blowing states, and sequentially switches between these states. In the adsorption state, the first inlet 11 is adapted to be connected to an air source to deliver air into the adsorption tower 1, where the adsorbent adsorbs carbon dioxide from the air. The air after passing through the adsorbent flows out from the first outlet 13. In the regeneration state, the second inlet 12 is adapted to be connected to a regeneration gas source to deliver regeneration gas into the adsorption tower 1, where the regeneration gas reacts with the adsorbent. Regeneration is performed to release the carbon dioxide adsorbed by the adsorbent. The mixed gas formed by the carbon dioxide and the regenerated gas after passing through the adsorbent flows from the second outlet 14 to the separation unit 4. In the cold blowing state, the second inlet 12 is connected to an air source to deliver air to the adsorption tower 1 to cool the adsorbent. The air after passing through the adsorbent flows from the second outlet 14 to the first inlet 11 of the adsorption tower 1 in the adsorption state. There are at least three adsorption towers 1. At least one of the at least three adsorption towers 1 is in the adsorption state, at least another of the at least three adsorption towers 1 is in the regeneration state, and at least another of the at least three adsorption towers 1 is in the cold blowing state.

[0021] The carbon dioxide capture system of this invention sets up at least three adsorption towers 1, such that at least one adsorption tower 1 is in an adsorption state, at least one adsorption tower 1 is in a regeneration state, and at least one adsorption tower 1 is in a cold blowing state. While some adsorption towers 1 continuously capture carbon dioxide from the air, the adsorbent in other adsorption towers 1 is regenerated, thereby achieving continuous capture of carbon dioxide from the air and improving the carbon dioxide capture efficiency. Moreover, this embodiment can directly reduce the carbon dioxide content in the air by directly capturing carbon dioxide from the air, achieving negative carbon emissions. Furthermore, the carbon dioxide capture system of this embodiment has a simple structure, low cost, and strong applicability.

[0022] Specifically, such as Figure 1As shown, the adsorption tower 1 includes a first adsorption tower 1, a second adsorption tower 1, and a third adsorption tower 1. Each of the three adsorption towers 1 has a first inlet 11, a second inlet 12, a third inlet, and a fourth inlet. The first inlet 11 and the second outlet 14 are located above the adsorption tower 1, while the second inlet 12 and the first outlet 13 are located below the adsorption tower 1. When the first adsorption tower 1 is in the adsorption state, the second adsorption tower 1 is in the regeneration state, and the third adsorption tower 1 is in the cold-blowing state; or, when the first adsorption tower 1 is in the adsorption state, the second adsorption tower 1 is in the cold-blowing state, and the third adsorption tower 1 is in the regeneration state. The sequential switching of the adsorption tower 1 between the adsorption state, regeneration state, and cold-blowing state means that the adsorption tower 1 is initially in the adsorption state. Once the adsorbent in the adsorption tower 1 is saturated or the adsorption tower 1 has been in the adsorption state for a predetermined time, it switches to the regeneration state. Once the adsorbent in the regeneration state has released all carbon dioxide or the regeneration state has been in operation for a predetermined time, the adsorption tower 1 switches to the cold-blowing state. After the cold-blowing state ends, it cycles back to the adsorption state.

[0023] In the adsorption state, air from the air source enters the adsorption tower 1 through the first inlet 11 at the top and flows from top to bottom. The adsorbent adsorbs carbon dioxide from the air, and the air after adsorption flows out through the first outlet 13 at the bottom of the adsorption tower 1. It is understood that in the adsorption state, the second inlet 12 and the second outlet 14 are closed, or valves are installed on the pipes connecting to the second inlet 12 and the second outlet 14, and these valves are closed.

[0024] In the regeneration state, the regeneration gas from the regeneration gas source enters the adsorption tower 1 through the second inlet 12 at the bottom and flows from bottom to top. As the regeneration gas passes through the adsorbent, it regenerates the adsorbent, releasing the carbon dioxide adsorbed by the adsorbent. The released carbon dioxide and the regeneration gas after passing through the adsorbent flow out through the second outlet 14 at the top of the adsorption tower 1 and flow to the separation unit 4. It is understood that in the regeneration state, the first inlet 11 and the first outlet 13 are closed, or valves are installed on the pipes connecting to the first inlet 11 and the first outlet 13, and these valves are closed.

[0025] In the cold-blowing state, air from the air source enters the adsorption tower 1 through the second inlet 12 at the bottom and flows from bottom to top. The air exchanges heat with the regenerated adsorbent, increasing its temperature and decreasing the temperature of the regenerated adsorbent, thus cooling the adsorbent. After passing through the adsorbent, the air exits through the second outlet 14 at the top of the adsorption tower 1 and flows into the adsorption tower in the adsorption state, allowing the adsorbent in the adsorption tower 1 to capture carbon dioxide from the air. In the cold-blowing state, after regeneration, the high temperature of the regeneration gas affects the adsorbent's adsorption efficiency. The cold-blowing process cools the adsorbent to ensure its adsorption efficiency.

[0026] Optionally, after adsorption tower 1 operates in adsorption mode for 8 hours, it switches to regeneration mode for 8 hours, and then switches to cold blowing mode for 8 hours to complete a one-day cycle.

[0027] In some embodiments, the carbon dioxide capture system further includes a compressor 2, one end of which is connected to an air source, the other end of which is connected to the first inlet 11 of the adsorption tower 1 in an adsorption state, and the other end of which is connected to the second inlet 12 of the adsorption tower 1 in a cold blowing state.

[0028] Specifically, such as Figure 1 As shown, the inlet of compressor 2 is connected to an air source, which means that the inlet of compressor 2 directly absorbs and compresses outside air. The outlet of compressor 2 can be selectively connected to either the first inlet 11 or the second inlet 12 of the same adsorption tower 1. It can be understood that, since there are multiple adsorption towers 1, the outlet of compressor 2 can simultaneously connect to the first inlet 11 of adsorption tower 1 in the adsorption state and to the second inlet 12 of adsorption tower 1 in the cold blowing state, so as to simultaneously supply compressed air to two adsorption towers 1.

[0029] Optionally, the pressure of the air compressed by compressor 2 is 0.3 MPa.

[0030] Alternatively, carbon dioxide capture systems can be installed in desert areas, photovoltaic power plants, and other locations to capture carbon dioxide directly from the air on a large scale.

[0031] In some embodiments, the carbon dioxide capture system further includes a pre-dryer 3, one end of which is connected to the other end of the compressor 2, and the other end of which is connected to the first inlet 11 of the adsorption tower 1 in the adsorption state. In the cold blowing state, the other end of the pre-dryer 3 is connected to the second inlet 12 of the adsorption tower 1 in the cold blowing state.

[0032] Specifically, such as Figure 1As shown, the pre-dryer 3 is located between the compressor 2 and the adsorption tower 1 to dry the air compressed by the compressor 2, so as to remove the moisture in the high-pressure air and avoid affecting the absorption efficiency of the adsorption tower 1.

[0033] The inlet of the pre-dryer 3 is connected to the outlet of the compressor 2, and the outlet of the pre-dryer 3 can be selectively connected to either the first inlet 11 or the second inlet 12 of the same adsorption tower 1. It is understood that, since there are multiple adsorption towers 1, the outlet of the pre-dryer 3 can simultaneously be connected to the first inlet 11 of the adsorption tower 1 in the adsorption state and to the second inlet 12 of the adsorption tower 1 in the cold blowing state, so as to simultaneously supply compressed dry air to two adsorption towers 1.

[0034] In some embodiments, the airflow rate when the other end of the pre-dryer 3 is connected to the second inlet 12 is less than the airflow rate when the other end of the pre-dryer 3 is connected to the first inlet 11.

[0035] In this embodiment, by making the airflow rate when the other end of the pre-dryer 3 is connected to the second inlet 12 less than the airflow rate when the other end of the pre-dryer 3 is connected to the first inlet 11, it is ensured that the air flowing out from the second outlet 14 of the adsorption tower 1 in the cold blowing state and the air to be entered into the adsorption tower 1 in the adsorption state from the first inlet 11 will not significantly increase the temperature of the air entering the adsorption tower 1, thus ensuring the adsorption efficiency of the adsorption tower 1.

[0036] In some embodiments, the airflow rate when the other end of the pre-dryer 3 is connected to the second inlet 12 is 30% of the airflow rate when the other end of the pre-dryer 3 is connected to the first inlet 11.

[0037] In this embodiment, the airflow rate when the other end of the pre-dryer 3 is connected to the second inlet 12 is 30% of the airflow rate when the other end of the pre-dryer 3 is connected to the first inlet 11, so as to further ensure the adsorption efficiency of the adsorption tower 1.

[0038] Of course, in other embodiments, the airflow when the other end of the pre-dryer 3 is connected to the second inlet 12 can also be 15%, 20%, 40% or other proportions of the airflow when the other end of the pre-dryer 3 is connected to the first inlet 11.

[0039] In some embodiments, the separation unit 4 includes a regenerated gas cooler 41 and a gas-liquid separator 42. The regenerated gas cooler 41 has a first opening 411, a second opening 412, a third opening 413, and a fourth opening 414. In the regeneration state, the first opening 411 is connected to the second outlet 14, the second opening 412 is connected to the inlet 421 of the gas-liquid separator, the third opening 413 is connected to the liquid outlet 422 of the gas-liquid separator, and the fourth opening 414 is connected to the second inlet 12. The gas outlet 423 of the gas-liquid separator is used to output the carbon dioxide separated by the gas-liquid separator 42.

[0040] Specifically, such as Figure 1 As shown, the regenerated gas cooler 41 has a first channel and a second channel that are independent of each other. The first channel connects the first opening 411 and the second opening 412, and the second channel connects the third opening 413 and the fourth opening 414. In the regeneration state, the carbon dioxide flowing out from the second outlet 14 of the adsorption tower 1 and the regeneration gas formed by the adsorbent enter the first channel through the first opening 411. After the regeneration gas cooler 41 cools the mixed gas, it flows to the gas-liquid separator 42 through the second opening 412. Since the regeneration gas is water vapor, the water vapor liquefies into water after cooling. The carbon dioxide and water are separated by the gas-liquid separator 42. The separated carbon dioxide flows out through the gas outlet 423 of the gas-liquid separator, and the separated water enters the second channel through the third opening 413 and circulates in the carbon dioxide capture system as the liquefied state of the regeneration gas. The mixed gas in the first channel and the water in the second channel exchange heat. The mixed gas in the first channel cools down, and the water in the second channel heats up. The heated water is vaporized into regeneration gas and enters the second inlet 12 of the adsorption tower 1 in the regeneration state. This realizes the utilization of waste heat and the regeneration of the adsorbent in the adsorption tower 1 in the regeneration state.

[0041] In some embodiments, the carbon dioxide capture system further includes a heat pump 5, one end of which is connected to a fourth opening 414, and the other end of which is connected to a second inlet 12 of the adsorption tower 1 in a regeneration state.

[0042] Specifically, such as Figure 1 As shown, the heat pump 5 is located between the regenerated gas cooler 41 and the adsorption tower 1. The inlet of the heat pump 5 is connected to the fourth opening 414 of the regenerated gas cooler 41, and the outlet of the heat pump 5 is connected to the second inlet 12 of the adsorption tower 1 in the regeneration state. By using the heat pump 5 to heat the water after heat exchange in the regenerated gas cooler 41, the quality of the regenerated gas can be improved, thereby improving the regeneration efficiency of the adsorption tower 1.

[0043] In some embodiments, the carbon dioxide capture system further includes a regenerating steam heater 6, one end of which is connected to the other end of the heat pump 5, and the other end of which is connected to the second inlet 12 of the adsorption tower 1 in the regeneration state.

[0044] Specifically, such as Figure 1 As shown, the regeneration steam heater 6 is located between the heat pump 5 and the adsorption tower 1. The inlet of the regeneration steam heater 6 is connected to the outlet of the heat pump 5, and the outlet of the regeneration steam heater 6 is connected to the second inlet 12 of the adsorption tower 1 in the regeneration state. The regeneration steam heater 6 continues to heat the regeneration gas to ensure the gasification state of the regeneration gas and improve the regeneration efficiency.

[0045] In some embodiments, such as Figure 1 As shown, the carbon dioxide capture system also includes a photovoltaic module 7, which is connected to a heat pump 5 and is used to supply energy to the heat pump 5.

[0046] In this embodiment, by setting up a photovoltaic module 7 to supply energy to the heat pump 5, the carbon dioxide capture system and the photovoltaic module 7 can be combined. The renewable energy (solar energy) is used to provide electricity to the heat pump 5, and the heat pump 5 is used to heat water to form regenerated gas, which helps to reduce the cost of carbon dioxide capture while improving energy utilization efficiency.

[0047] In some embodiments, such as Figure 1 As shown, the carbon dioxide capture system also includes a post-filter 8. In the adsorption state, the first outlet 13 is connected to the post-filter 8 to filter the adsorbent in the air flowing out of the first outlet 13. The air filtered by the post-filter 8 is then discharged to the outside.

[0048] In this embodiment, by setting a post-filter 8 downstream of the first outlet 13 of the adsorption tower 1, the air after carbon dioxide adsorption by the adsorbent can be filtered to prevent the air from carrying away the adsorbent in the adsorption tower 1. The air filtered by the post-filter 8 is directly discharged to the outside.

[0049] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0050] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0051] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0052] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0053] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0054] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A carbon dioxide capture system, characterized in that, The adsorption tower includes an adsorption tower having a first inlet, a second inlet, a first outlet, and a second outlet. The adsorption tower has an adsorption state, a regeneration state, and a cold-blowing state, and the adsorption tower switches sequentially between the adsorption state, the regeneration state, and the cold-blowing state. In the adsorption state, the first inlet is adapted to be connected to an air source to deliver air into the adsorption tower, where the adsorbent adsorbs carbon dioxide from the air, and the air after passing through the adsorbent flows out from the first outlet. In the regeneration state, the second inlet is adapted to be connected to a regeneration gas source to deliver regeneration gas into the adsorption tower. The regeneration gas regenerates the adsorbent to release the carbon dioxide adsorbed by the adsorbent. The mixed gas formed by the carbon dioxide and the regeneration gas after passing through the adsorbent flows from the second outlet to the separation unit. In the cold blowing state, the second inlet is connected to the air source to deliver air into the adsorption tower to cool the adsorbent. The air after passing through the adsorbent flows from the second outlet to the first inlet of the adsorption tower in the adsorption state. The adsorption towers are at least three, at least one of the at least three adsorption towers is in the adsorption state, at least another of the at least three adsorption towers is in the regeneration state, and at least one of the at least three adsorption towers is in the cold blowing state.

2. The carbon dioxide capture system according to claim 1, characterized in that, The carbon dioxide capture system further includes a compressor, one end of which is connected to the air source, the other end of which is connected to the first inlet of the adsorption tower in the adsorption state, and the other end of which is connected to the second inlet of the adsorption tower in the cold blowing state.

3. The carbon dioxide capture system according to claim 2, characterized in that, The carbon dioxide capture system further includes a pre-dryer, one end of which is connected to the other end of the compressor, and the other end of which is connected to the first inlet of the adsorption tower in the adsorption state. In the cold blowing state, the other end of the pre-dryer is connected to the second inlet of the adsorption tower in the cold blowing state.

4. The carbon dioxide capture system according to claim 3, characterized in that, The airflow rate when the other end of the pre-dryer is connected to the second inlet is less than the airflow rate when the other end of the pre-dryer is connected to the first inlet.

5. The carbon dioxide capture system according to claim 4, characterized in that, The airflow rate when the other end of the pre-dryer is connected to the second inlet is 30% of the airflow rate when the other end of the pre-dryer is connected to the first inlet.

6. The carbon dioxide capture system according to claim 1, characterized in that, The separation unit includes a regenerated gas cooler and a gas-liquid separator. The regenerated gas cooler has a first opening, a second opening, a third opening, and a fourth opening. In the regeneration state, the first opening is connected to the second outlet, the second opening is connected to the inlet of the gas-liquid separator, the third opening is connected to the liquid outlet of the gas-liquid separator, and the fourth opening is connected to the second inlet. The gas outlet of the gas-liquid separator is used to output the carbon dioxide separated by the gas-liquid separator.

7. The carbon dioxide capture system according to claim 6, characterized in that, The carbon dioxide capture system also includes a heat pump, one end of which is connected to the fourth opening, and the other end of which is connected to the second inlet of the adsorption tower in the regeneration state.

8. The carbon dioxide capture system according to claim 7, characterized in that, The carbon dioxide capture system also includes a regenerating steam heater, one end of which is connected to the other end of the heat pump, and the other end of which is connected to the second inlet of the adsorption tower in the regeneration state.

9. The carbon dioxide capture system according to claim 8, characterized in that, The carbon dioxide capture system also includes a photovoltaic module, which is connected to the heat pump and is used to supply energy to the heat pump.

10. The carbon dioxide capture system according to any one of claims 1-9, characterized in that, The carbon dioxide capture system also includes a post-filter. In the adsorption state, the first outlet is connected to the post-filter to filter the adsorbent in the air flowing out of the first outlet. The air filtered by the post-filter is then discharged to the outside.

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