Flue gas low temperature purification and capture system

Abstract

The present invention discloses a flue gas low-temperature purification and capture system, including an adsorption and capture tower, the adsorption and capture tower including an inner tower and an outer tower arranged at intervals in the inner and outer directions, an adsorption chamber defined between the inner tower and the outer tower, an adsorption layer provided in the adsorption chamber, the adsorption layer dividing the adsorption chamber into a first chamber and a second chamber arranged in the inner and outer directions, the first chamber being located on the outside of the adsorption layer, the outer tower having a smoke inlet connected to the first chamber, the smoke inlet being used to transport low-temperature flue gas below zero into the first chamber, the inner tower having an absorption chamber and a smoke exhaust port, the absorption chamber being connected to the second chamber. The flue gas low-temperature purification and capture system of the embodiment of the present invention realizes the miniaturization of the tower, which can not only save space, but also reduce manufacturing costs, has the characteristics of high integration, and greatly reduces system energy consumption and costs.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon capture, and in particular to a flue gas low-temperature purification and capture system. Background Art

[0002] In the related technology, the flue gas discharged from the coal-fired boiler is purified by low-temperature adsorption desulfurization and denitrification, and then the purified flue gas is passed into the CCUS system for carbon capture, utilization and storage to reduce the concentration of carbon dioxide in the atmosphere, thereby mitigating the impact of carbon dioxide on global warming and climate change.

[0003] Since the flue gas temperature after low-temperature adsorption is very low, below zero degrees, and the suitable temperature for carbon capture absorbent to absorb carbon dioxide is usually above zero degrees, and it is an exothermic reaction, if the temperature is too low, the chemical reaction rate of the absorbent will slow down and the absorption efficiency will decrease. Therefore, it is necessary to heat up the flue gas after low-temperature adsorption and cool down the absorbent to meet the optimal absorption temperature of the absorbent. However, this not only requires a large number of separately set towers, but also a large area of ​​the overall system, a large number of equipment, and complex pipeline connections, and the system energy consumption and cost are high. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, an embodiment of the present invention provides a flue gas low-temperature purification and capture system.

[0005] The flue gas low-temperature purification and capture system of an embodiment of the present invention includes an adsorption and capture tower, which includes an inner tower and an outer tower arranged at intervals in the inner and outer directions, an adsorption chamber is defined between the inner tower and the outer tower, an adsorption layer is provided in the adsorption chamber, the adsorption layer divides the adsorption chamber into a first chamber and a second chamber arranged in the inner and outer directions, the first chamber is located on the outside of the adsorption layer, the outer tower has a smoke inlet connected to the first chamber, the smoke inlet is used to transport low-temperature flue gas below zero degrees into the first chamber, the inner tower has an absorption chamber and a smoke exhaust port, the absorption chamber is connected to the second chamber, the low-temperature flue gas adsorbed by the adsorption layer enters the second chamber and exchanges heat with the absorbent in the adsorption chamber through the side wall of the inner tower to cool the absorbent in the absorption chamber, the low-temperature flue gas after heat exchange in the second chamber enters the absorption chamber, and the smoke exhaust port is used to exhaust the flue gas absorbed in the absorption chamber.

[0006] Optionally, a first partition is provided in the first chamber, the first partition divides the first chamber into a first sub-chamber and a second sub-chamber arranged in the up and down directions, the first sub-chamber is located below the second sub-chamber, the first partition is provided with a connecting pipe penetrating the first partition in the up and down directions, the connecting pipe has a first connecting part and a second connecting part, the first connecting part is located in the first sub-chamber and connected to the first sub-chamber, the second connecting part is located in the second sub-chamber and connected to the second sub-chamber, and the smoke inlet is connected to the first sub-chamber.

[0007] Optionally, the first connecting portion includes a plurality of first holes, and the first holes are located on the side wall of the connecting pipe; and / or

[0008] The second communication portion includes a plurality of second holes, and the second holes are located on a side wall of the communication pipe.

[0009] Optionally, the first hole and / or the second hole is arranged away from the adsorption layer in the inner and outer directions.

[0010] Optionally, there are a plurality of the first holes, the plurality of the first holes are arranged at intervals in the up-down direction, and the interval between two adjacent first holes gradually decreases in a direction approaching the partition plate;

[0011] And / or there are multiple second holes, the multiple second holes are arranged at intervals in the up and down directions, and the distance between two adjacent second holes gradually increases in the direction away from the partition.

[0012] Optionally, a first smoke conveying pipe is provided on the inner tower, and the first smoke conveying pipe is located at the bottom of the inner tower, and two ends of the first smoke conveying pipe are respectively connected to the second chamber and the absorption chamber.

[0013] Optionally, the outer side wall of the inner tower has a plurality of protrusions arranged at intervals.

[0014] Optionally, the inner tower further comprises a spray chamber located above the absorption chamber, and the flue gas absorbed by the absorption chamber is transported to the spray chamber for spraying, and the smoke exhaust port is connected to the spray chamber to discharge the flue gas after spraying in the spray chamber.

[0015] Optionally, a second partition is provided between the spray chamber and the absorption chamber, and a second smoke conveying pipe extending in the up and down directions is provided on the second partition, and two ports of the second smoke conveying pipe are respectively connected to the absorption chamber and the spray chamber, and an air lifting cap is provided on the outlet of the second smoke conveying pipe, and the liquid level of the spray liquid in the spray chamber is located below the air lifting cap.

[0016] Optionally, the inner tower is provided with a liquid inlet pipe and a liquid discharge pipe connected to the spray chamber, and a heat exchange pipe is provided between the liquid inlet pipe and the liquid discharge pipe. The heat exchange pipe is located in the second chamber and is used for exchanging heat with the low-temperature flue gas in the second chamber to cool the spray liquid in the spray chamber.

[0017] The flue gas low-temperature purification and capture system of the embodiment of the present invention realizes low-temperature adsorption and carbon capture of flue gas, which improves the purification effect of flue gas, can achieve near-zero emissions, and also realizes the capture of carbon dioxide in flue gas. Moreover, the low-temperature adsorption and carbon capture of flue gas are integrated into one tower. Compared with the related technology, the number of equipment is reduced and the miniaturization of the tower is realized, which can not only save space but also reduce manufacturing costs, and has the characteristics of high integration. In addition, by exchanging heat between low-temperature flue gas and absorbent, and by increasing and decreasing the temperature values ​​of the two, it is possible to avoid using an external heat source to heat the flue gas and avoid using an external cold source to cool the absorbent, which greatly reduces the energy consumption and cost of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of an adsorption capture tower according to an embodiment of the present invention.

[0019] Figure 2 1 is a top view of an adsorption capture tower according to an embodiment of the present invention.

[0020] Reference numerals:

[0021] 1. Adsorption capture tower; 101. Inner tower; 1011. Absorption chamber; 1012. Smoke exhaust port; 1013. Raised portion; 1014. Spray chamber; 102. Outer tower; 1021. Smoke inlet; 3. Adsorption chamber; 301. First chamber; 3011. First sub-chamber; 3012. Second sub-chamber; 302. Second chamber; 4. Adsorption layer; 5. First partition; 6. Connecting pipe; 601. First hole; 602. Second hole; 7. First smoke conveying pipe; 8. Second smoke conveying pipe; 9. Second partition; 11. Air lifting cap; 12. Liquid inlet pipe; 13. Liquid discharge pipe; 14. Heat exchange pipe. DETAILED DESCRIPTION

[0022] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0023] like Figure 1 and Figure 2As shown, the flue gas low temperature purification and capture system of the embodiment of the present invention includes an adsorption capture tower 1, which includes an inner tower 101 and an outer tower 102 arranged at intervals in the inner and outer directions, and an adsorption chamber 3 is defined between the inner tower 101 and the outer tower 102. An adsorption layer 4 is provided in the adsorption chamber 3, and the adsorption layer 4 divides the adsorption chamber 3 into a first chamber 301 and a second chamber 302 arranged in the inner and outer directions, and the first chamber 301 is located outside the adsorption layer 4. The outer tower 102 is provided with a smoke inlet 1021 connected to the first chamber 301, and the smoke inlet 1021 is used to transport low-temperature smoke below zero degrees into the first chamber 301.

[0024] The inner tower 101 has an absorption chamber 1011 and a smoke outlet 1012. The absorption chamber 1011 is connected to the second chamber 302. The low-temperature flue gas adsorbed by the adsorption layer 4 enters the second chamber 302 and exchanges heat with the absorbent in the adsorption chamber 3 through the inner tower 101 to cool the absorbent in the absorption chamber 1011. The low-temperature flue gas after heat exchange in the second chamber 302 enters the absorption chamber 1011, and the smoke outlet 1012 is used to discharge the flue gas absorbed in the absorption chamber 1011.

[0025] When the flue gas low-temperature purification and capture system of the embodiment of the present invention is working, the low-temperature flue gas is transported to the first chamber 301 through the smoke inlet 1021. The low-temperature flue gas in the first chamber 301 passes through the adsorption layer 4 and enters the second chamber 302. The flue gas is adsorbed by the adsorbent in the adsorption layer to remove sulfides and nitrogen oxides in the flue gas, thereby achieving purification of the flue gas. After adsorption, the flue gas exchanges heat with the tower wall of the inner tower 101 and the absorbent in the absorption chamber 1011 in the second chamber 302. While the flue gas temperature increases, the temperature of the absorbent is also reduced, so that the ambient temperature in the absorption chamber 1011 and the temperature of the absorbent are maintained at the optimal temperature to improve the carbon capture efficiency. The absorbent in the absorption chamber 1011 absorbs carbon dioxide in the flue gas, thereby achieving the capture of carbon dioxide, and the absorbed flue gas is discharged through the exhaust port 1012.

[0026] Therefore, the flue gas low temperature purification and capture system of the embodiment of the present invention realizes low temperature adsorption and carbon capture of flue gas, improves the purification effect of flue gas, can achieve near zero emission, and also realizes the capture of carbon dioxide in flue gas. Moreover, the low temperature adsorption and carbon capture of flue gas are integrated into one tower, which reduces the number of equipment and realizes the miniaturization of the tower compared with the related technology, which can not only save space but also reduce manufacturing costs, and has the characteristics of high integration.

[0027] In addition, by exchanging heat between low-temperature flue gas and absorbent and adjusting the temperature values ​​of the two, it is possible to avoid using an external heat source to heat the flue gas and avoid using an external cold source to cool the absorbent, thereby greatly reducing the system energy consumption and cost.

[0028] In some embodiments, a first partition 5 is provided in the first chamber 301, and the first partition 5 divides the first chamber 301 into a first sub-chamber 3011 and a second sub-chamber 3012 arranged in the up-down direction, and the first sub-chamber 3011 is located above the second sub-chamber 3012. The first partition 5 is provided with a connecting pipe 6 that penetrates the first partition 5 in the up-down direction, and the connecting pipe 6 has a first connecting portion and a second connecting portion, the first connecting portion is located in the first sub-chamber 3011 and is connected to the first sub-chamber 3011, the second connecting portion is located in the second sub-chamber 3012 and is connected to the second sub-chamber 3012, and the smoke inlet 1021 is connected to the second sub-chamber 3012.

[0029] like Figure 1 As shown, it can be understood that the density of smoke is less than that of air. When smoke enters the first chamber 301, it is easy to accumulate on the top of the first chamber 301, resulting in uneven distribution of smoke in the first chamber 301, thereby affecting the absorption efficiency of the adsorption layer 4 for smoke.

[0030] In the present embodiment, after the smoke enters the first sub-chamber 3011 through the smoke inlet 1021, the smoke in the first sub-chamber 3011 will enter the connecting pipe through the first connecting portion and flow upward, and enter the second sub-chamber 3012 through the second connecting portion. Due to the isolation and blocking effect of the first partition 5, the smoke can be prevented from directly flowing upward after entering the first sub-chamber 3011 and accumulating on the top of the first chamber 301, so that the smoke can be reasonably distributed in the first sub-chamber 3011 and the second sub-chamber 3012, avoiding local accumulation of the smoke, which is conducive to improving the adsorption efficiency of the adsorption layer 4 on the smoke.

[0031] Optionally, the first connecting portion includes a plurality of first holes 601, and the first holes 601 are located on the side wall of the connecting pipe 6. The first holes 601 can be arranged at intervals along the circumference of the connecting pipe 6, or can be arranged at intervals along the axial direction of the connecting pipe 6. Providing the first holes 601 on the side wall of the connecting pipe 6 can avoid entry from the end of the connecting pipe 6, which is conducive to improving the flow efficiency of the flue gas.

[0032] Optionally, the second connecting portion includes a plurality of second holes 602, and the second holes 602 are located on the side wall of the connecting pipe 6. The second holes 602 can be arranged at intervals along the circumference of the connecting pipe 6, or can be arranged at intervals along the axial direction of the connecting pipe 6. Providing the second holes 602 on the side wall of the connecting pipe 6 can prevent the smoke from flowing out from the end of the connecting pipe 6, which is conducive to improving the flow efficiency of the smoke.

[0033] In some embodiments, the first hole 601 and / or the second hole 602 are arranged away from the adsorption layer 4 in the inner-outer direction. It can be understood that only the first hole 601 is arranged away from the adsorption layer 4 in the inner-outer direction, or only the second hole 602 is arranged away from the adsorption layer 4 in the inner-outer direction, or both the first hole 601 and the second hole 602 are arranged away from the adsorption layer 4 in the inner-outer direction.

[0034] When the first hole 601 is arranged away from the adsorption layer 4 in the inner and outer directions, when the smoke enters the connecting pipe 6 from the first hole 601, turbulence will be formed at the position of the first hole 601 due to the flow of the smoke, which is conducive to mixing the smoke in the first sub-chamber 3011, so that the smoke is evenly distributed in the first sub-chamber 3011. In addition, since the first hole 601 is arranged away from the adsorption layer 4, the turbulence formed at the position of the first hole 601 will not interfere with the smoke entering the adsorption layer 4, which is conducive to improving the stability of the smoke entering the adsorption layer 4.

[0035] When the second hole 602 is arranged away from the adsorption layer 4 in the inner and outer directions, when the smoke flows into the second sub-cavity 3012 from the second hole 602, turbulence will be formed at the position of the second hole 602 due to the flow of the smoke, which is conducive to the mixing of the smoke in the second sub-cavity 3012, so that the smoke is evenly distributed in the second sub-cavity 3012. In addition, since the second hole 602 is arranged away from the adsorption layer 4, the turbulence formed at the position of the second hole 602 will not interfere with the smoke entering the adsorption layer 4, which is conducive to improving the stability of the smoke entering the adsorption layer 4.

[0036] In some embodiments, there are multiple first holes 601 , and the multiple first holes 601 are arranged at intervals in the up and down directions, wherein the interval between two adjacent first holes 601 gradually decreases in the direction approaching the partition.

[0037] like Figure 1 As shown, after smoke enters the first sub-chamber 3011, since the density of smoke is smaller than that of air, smoke will accumulate at the top of the first sub-chamber 3011, while the density of smoke at the bottom of the first sub-chamber 3011 is relatively small. Therefore, the spacing between the two first holes 601 is gradually reduced in the direction close to the partition, which can increase the flow rate of smoke entering the connecting pipe 6 from the top of the first sub-chamber 3011 and reduce the flow rate of smoke entering the connecting pipe 6 from the bottom of the first sub-chamber 3011, which is conducive to improving the uniformity of smoke distribution in the first sub-chamber 3011.

[0038] In some embodiments, there are multiple second holes 602 , and the multiple second holes 602 are arranged at intervals in the up and down directions, wherein the interval between two adjacent second holes 602 gradually increases in the direction away from the partition.

[0039] like Figure 1As shown, since the smoke flows from bottom to top in the connecting pipe 6, the smoke flow rate in the connecting pipe 6 will gradually decrease during the upward flow process. The distance between two adjacent first holes 601 is gradually reduced in the direction close to the partition, which can increase the smoke flow rate at the top of the second sub-chamber 3012 and reduce the smoke flow rate at the bottom of the second sub-chamber 3012 to compensate for the uneven smoke distribution caused by the gradual decrease in the smoke flow rate in the connecting pipe 6, which is beneficial to improving the uniformity of smoke distribution in the second sub-chamber 3012.

[0040] In some embodiments, a first smoke conveying pipe 7 is provided on the inner tower 101 . The first smoke conveying pipe 7 is located at the bottom of the inner tower 101 . Two ends of the first smoke conveying pipe 7 are connected to the second chamber 302 and the absorption chamber 1011 , respectively.

[0041] like Figure 1 and Figure 2 As shown, since the first smoke conveying pipe 7 is located at the bottom of the inner tower 101, when the smoke in the second chamber 302 needs to flow from the top to the bottom of the second chamber 302, it will then enter the absorption chamber 1011 through the first smoke conveying pipe 7. This can increase the flow path of the smoke, thereby increasing the heat exchange time with the tower wall of the inner tower 101, improving the heat exchange effect between the smoke and the inner tower 101, and further improving the cooling effect on the absorbent.

[0042] In some embodiments, the outer side wall of the inner tower 101 has a plurality of protrusions 1013 arranged at intervals.

[0043] For example, Figure 1 and Figure 2 As shown, the protrusion 1013 is semi-spherical. Of course, the protrusion 1013 can also be other shapes, such as square, triangle or ellipse. By arranging the protrusion 1013 on the outer wall of the inner tower 101, on the one hand, the flue gas can form turbulence at the position of the protrusion 1013 during the downward flow of the flue gas in the second chamber 302, so as to improve the heat exchange efficiency between the flue gas and the tower wall of the inner tower 101. In addition, the contact area between the flue gas and the tower wall of the inner tower 101 can also be increased, thereby improving the heat exchange effect between the flue gas and the tower wall of the inner tower 101.

[0044] In some embodiments, the inner tower 101 also has a spray chamber 1014 located above the absorption chamber 1011. The flue gas absorbed by the absorption chamber 1011 is transported to the spray chamber 1014 for spraying. The smoke exhaust port 1012 is connected to the spray chamber 1014 to discharge the flue gas after spraying in the spray chamber 1014.

[0045] The clean flue gas absorbed in the absorption chamber 1011 is transported to the spray chamber 1014, which is used to spray the clean flue gas after absorbing carbon dioxide, and the sprayed flue gas is discharged into the atmosphere through the exhaust port 1012. The spray chamber 1015 sprays the flue gas mainly for the following two purposes: on the one hand, the flue gas is cooled to the discharge temperature, and on the other hand, the absorbent in the flue gas is sprayed out to prevent the absorbent from entering the atmosphere with the flue gas and polluting the atmosphere.

[0046] In some embodiments, a second partition plate 9 is provided between the spray chamber 1014 and the absorption chamber 1011, and a second smoke delivery pipe 8 extending in the up-down direction is provided on the second partition plate 9, and two ends of the second smoke delivery pipe 8 are respectively connected with the absorption chamber 1011 and the spray chamber 1014. An air lift cap 11 is provided on the outlet of the second smoke delivery pipe 8, and the liquid level of the spray liquid in the spray chamber 1014 is located below the air lift cap 11.

[0047] The smoke absorbed in the absorption chamber 1011 enters the second smoke delivery pipe 8 and passes through the gas lift cap 11 to the spray chamber 1014. The gas lift cap 11 can also block the spray liquid while exhausting smoke to prevent the spray liquid from flowing into the absorption chamber 1011 through the second smoke delivery pipe 8 and affecting the absorbent. During the spraying process, the liquid level of the spray liquid needs to be controlled to prevent the liquid level of the spray liquid from being too high and flooding the second smoke delivery pipe 8, causing the spray liquid to enter the absorption chamber 1011 through the second smoke delivery pipe 8.

[0048] In some embodiments, a liquid inlet pipe 12 and a liquid discharge pipe 13 connected to the spray chamber 1014 are provided on the inner tower 101, and a heat exchange pipe 14 is provided between the liquid inlet pipe 12 and the liquid discharge pipe 13. The heat exchange pipe 14 is located in the second chamber 302 and is used for heat exchange with the low-temperature flue gas in the second chamber 302 to cool the spray liquid in the spray chamber 1014.

[0049] It should be noted that, since the temperature of the spray liquid will rise after spraying the absorbed flue gas, the spray liquid needs to be continuously cooled. In the embodiment of the present invention, the spray liquid in the spray chamber 1014 flows out through the drain pipe 13 and enters the heat exchange pipe 14, and exchanges heat with the low-temperature flue gas in the first chamber 301 through the heat exchange pipe 14 to cool the spray liquid, so that the spray liquid is always at the optimal spraying temperature. After cooling, the spray liquid flows back to the spray chamber 1014 through the liquid inlet pipe 12.

[0050] Therefore, the flue gas low-temperature purification and capture system of the embodiment of the present invention effectively utilizes the cold in the flue gas after low-temperature adsorption to exchange heat with the heat in the spray liquid, and reduces the temperature of the spray liquid while increasing the flue gas temperature, so that the spray liquid is at the optimal spray temperature, which can avoid cooling the spray liquid by using external energy consumption, which not only helps to reduce the energy consumption of the system, but also improves the efficiency of the system. In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply 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 a limitation on the present invention.

[0051] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0052] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0054] In the present invention, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0055] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A flue gas low temperature purification and capture system, characterized in that: include: An adsorption capture tower, the adsorption capture tower comprises an inner tower and an outer tower arranged at intervals in the inner and outer directions, an adsorption chamber is defined between the inner tower and the outer tower, an adsorption layer is arranged in the adsorption chamber, the adsorption layer divides the adsorption chamber into a first chamber and a second chamber arranged in the inner and outer directions, the first chamber is located outside the adsorption layer, the outer tower has a smoke inlet connected to the first chamber, the smoke inlet is used to transport low-temperature smoke below zero degrees into the first chamber, the smoke is adsorbed by the adsorbent in the adsorption layer to remove sulfide and nitrogen in the smoke Oxide, thereby achieving purification of flue gas, the inner tower has an absorption chamber and a smoke exhaust port, the absorption chamber is connected with the second chamber, the low-temperature flue gas after adsorption by the adsorption layer enters the second chamber and exchanges heat with the absorbent in the adsorption chamber through the side wall of the inner tower to cool the absorbent in the absorption chamber, the low-temperature flue gas after heat exchange in the second chamber enters the absorption chamber, the absorbent in the absorption chamber absorbs carbon dioxide in the flue gas, thereby achieving the capture of carbon dioxide, and the smoke exhaust port is used to discharge the flue gas after absorption in the absorption chamber.

2. The flue gas low temperature purification and capture system according to claim 1, characterized in that: A first partition is provided in the first chamber, and the first partition divides the first chamber into a first sub-chamber and a second sub-chamber arranged in the up-down direction. The first sub-chamber is located below the second sub-chamber. The first partition is provided with a connecting pipe penetrating the first partition in the up-down direction. The connecting pipe has a first connecting portion and a second connecting portion. The first connecting portion is located in the first sub-chamber and connected to the first sub-chamber, the second connecting portion is located in the second sub-chamber and connected to the second sub-chamber, and the smoke inlet is connected to the first sub-chamber.

3. The flue gas low temperature purification and capture system according to claim 2, characterized in that: The first connecting portion includes a plurality of first holes, and the first holes are located on the side wall of the connecting pipe; and / or The second communication portion includes a plurality of second holes, and the second holes are located on a side wall of the communication pipe.

4. The flue gas low temperature purification and capture system according to claim 3, characterized in that: The first hole and / or the second hole are arranged away from the adsorption layer in the inner and outer directions.

5. The flue gas low temperature purification and capture system according to claim 3, characterized in that: There are a plurality of the first holes, the plurality of the first holes are arranged at intervals in the up-down direction, and the interval between two adjacent first holes gradually decreases in the direction approaching the partition plate; And / or there are multiple second holes, the multiple second holes are arranged at intervals in the up and down directions, and the distance between two adjacent second holes gradually increases in the direction away from the partition.

6. The flue gas low temperature purification and capture system according to claim 1, characterized in that: The inner tower is provided with a first smoke conveying pipe, which is located at the bottom of the inner tower. Two ends of the first smoke conveying pipe are respectively connected with the second chamber and the absorption chamber.

7. The flue gas low temperature purification and capture system according to claim 1, characterized in that: The outer side wall of the inner tower is provided with a plurality of protrusions arranged at intervals.

8. The flue gas low temperature purification and capture system according to claim 1, characterized in that: The inner tower also has a spray chamber located above the absorption chamber, and the smoke absorbed by the absorption chamber is transported to the spray chamber for spraying. The smoke exhaust port is connected to the spray chamber to discharge the smoke after spraying in the spray chamber.

9. The flue gas low temperature purification and capture system according to claim 8, characterized in that: A second partition is provided between the spray chamber and the absorption chamber, and a second smoke conveying pipe extending in the up-down direction is provided on the second partition, and two ends of the second smoke conveying pipe are respectively connected with the absorption chamber and the spray chamber, and an air lifting cap is provided on the outlet of the second smoke conveying pipe, and the liquid level of the spray liquid in the spray chamber is located below the air lifting cap.

10. The flue gas low temperature purification and capture system according to claim 8, characterized in that: The inner tower is provided with a liquid inlet pipe and a liquid discharge pipe connected to the spray chamber, a heat exchange pipe is provided between the liquid inlet pipe and the liquid discharge pipe, and the heat exchange pipe is located in the second chamber and is used for exchanging heat with the low-temperature flue gas in the second chamber to cool the spray liquid in the spray chamber.

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