Regeneration tower and flue gas treatment system

Abstract

The invention discloses a regeneration tower and a flue gas treatment system.The regeneration tower comprises a tower body and a heat exchange assembly, the tower body is provided with a first cavity, a second cavity and a third cavity, the first cavity, the second cavity and the third cavity are sequentially arranged in the up-down direction and communicate with one another in the up-down direction, the first cavity is suitable for introducing rich liquid, and the second cavity is suitable for introducing rich liquid; the heat exchange assembly is arranged in the second cavity and comprises a storage cavity and a heat exchange cavity, the storage cavity communicates with the first cavity so that rich liquid in the first cavity can flow into the storage cavity, one end of the heat exchange cavity communicates with the storage cavity, one end of the heat exchange cavity is suitable for introducing high-temperature steam, and the heat exchange cavity communicates with the third cavity; the heat exchange assembly and the inner circumferential face of the second cavity are arranged in a spaced mode to form an air flow channel so that the carbon dioxide in the third cavity can flow into the first cavity through the air flow channel. The regeneration tower has the advantages of small occupied area, low cost and the like.

Description

Technical Field

[0001] The present invention relates to the field of flue gas treatment, and in particular to a regeneration tower and a flue gas treatment system. Background Art

[0002] The flue gas discharged from coal-fired boilers is generally treated by high-temperature adsorption in an adsorption tower. The high-temperature flue gas with a temperature of about 200°C is passed into the adsorption tower. The pollutants (sulfides and nitrogen oxides) in the high-temperature flue gas are adsorbed and removed by the adsorbent in the adsorption tower. The saturated adsorbent is transported to the regeneration tower for heating and desorption regeneration. The pollutants are desorbed from the adsorbent and recycled, and the adsorbent is regenerated.

[0003] In the related art, the reboiler is arranged outside the regeneration tower to heat the rich liquid in the regeneration tower and transport the heated rich liquid into the regeneration tower to improve the regeneration effect. The reboiler and the regeneration tower are separately arranged, occupying a large area. 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.

[0005] To this end, an embodiment of the present invention provides a regeneration tower with a small footprint and a heating function.

[0006] The embodiment of the present invention provides a flue gas treatment system with simple structure and low cost.

[0007] A regeneration tower according to an embodiment of the present invention comprises: a tower body, the tower body having a first chamber, a second chamber and a third chamber, the first chamber, the second chamber and the third chamber being arranged in sequence along the up-down direction and communicating with each other along the up-down direction, the first chamber being suitable for introducing rich liquid; a heat exchange component, the heat exchange component being arranged in the second chamber and the heat exchange component comprising a storage chamber and a heat exchange chamber, the storage chamber being communicated with the first chamber so that the rich liquid in the first chamber flows into the storage chamber, one end of the heat exchange chamber being communicated with the storage chamber so that the rich liquid in the storage chamber flows into the heat exchange chamber, one end of the heat exchange chamber being suitable for introducing high-temperature steam so that the high-temperature steam heats the rich liquid through the heat exchange chamber so that the rich liquid is decomposed into lean liquid and carbon dioxide, the heat exchange chamber being communicated with the third chamber so that the lean liquid and carbon dioxide decomposed by the heat exchange chamber flow into the third chamber, the heat exchange component being spaced apart from the inner circumference of the second chamber to form an air flow channel so that the carbon dioxide in the third chamber flows into the first chamber through the air flow channel.

[0008] The regeneration tower of the embodiment of the present invention is provided with a heat exchange component, and the heat exchange component and the regeneration tower are integrated into a whole to heat the rich liquid in the tower body to decompose the rich liquid into lean liquid, simplifying the equipment structure layout and reducing the device footprint.

[0009] In some embodiments, the heat exchange component includes: an inner shell and an outer shell, the outer shell is sleeved outside the inner shell and the inner circumference of the outer shell and the outer circumference of the inner shell are spaced apart to form the heat exchange cavity, the inner circumference of the inner shell defines the storage cavity, the outer circumference of the outer shell and the inner circumference of the tower body are spaced apart to form the airflow channel; a heat exchange tube, the heat exchange tube is arranged in the heat exchange cavity, one end of the heat exchange tube is connected to the inner shell, the other end of the heat exchange tube passes through the outer shell and extends into the third cavity, the other end of the heat exchange tube is located in the lean liquid of the third cavity, and the bottom of the outer shell is suitable for passing high-pressure gas.

[0010] In some embodiments, the regeneration tower further includes: a mounting cylinder, wherein the lower end of the mounting cylinder is connected to the inner shell, the upper end of the mounting cylinder is connected to the tower body, the cross-sectional area of ​​the inner circumferential surface of the mounting cylinder gradually increases from bottom to top, and the mounting cylinder is provided with an air outlet hole penetrating the mounting cylinder in the up and down directions, the air outlet hole is connected to the air flow channel, so that the carbon dioxide in the third chamber flows into the first chamber through the air outlet hole; and a breathable member, the breathable member is arranged in the air outlet hole, the carbon dioxide in the gas channel can flow into the first chamber through the air permeable member, and the rich liquid in the first chamber cannot flow into the air flow channel through the air permeable member.

[0011] In some embodiments, there are a plurality of air outlet holes, which are spaced apart along the circumference of the mounting tube, and there are a plurality of air permeable members, which are arranged in a one-to-one correspondence in the plurality of air outlet holes.

[0012] In some embodiments, the air permeable member can be any one of a ceramic membrane, a metal membrane, a polymer composite membrane, a glass fiber membrane, and the like.

[0013] In some embodiments, the heat exchange tube includes a first tube and a second tube, the first tube spirally wraps upward around the outer circumference of the inner shell, one end of the first tube is connected to the bottom of the inner shell, and the other end of the first tube is connected to the second tube, the second tube is a vertical tube extending up and down, and the other end of the second tube passes through the outer shell and extends into the lean liquid in the third chamber.

[0014] In some embodiments, the regeneration tower further has an inlet and an outlet, wherein the inlet is disposed on the tower body and adjacent to the top of the tower body, the inlet is connected to the first chamber, and the outlet is disposed at the bottom of the tower and connected to the third chamber.

[0015] In some embodiments, the regeneration tower further includes a heating component, which is disposed in the heat exchange cavity and is used to heat the rich liquid in the air flow channel.

[0016] In some embodiments, the regeneration tower further includes a spray assembly, which is disposed in the first chamber and adjacent to the tower top, and is suitable for introducing cooling water to cool the steam in the first chamber so as to liquefy the steam in the first chamber.

[0017] The flue gas treatment system according to an embodiment of the present invention includes: an absorption tower, wherein a lean liquid is provided in the absorption tower and is suitable for passing flue gas so that the lean liquid absorbs carbon dioxide in the flue gas to convert the lean liquid into a rich liquid; a regeneration tower, wherein the regeneration tower is the regeneration tower of any one of the above embodiments, one end of the regeneration tower is connected with one end of the absorption tower so that the rich liquid in the absorption tower flows into the regeneration tower so that the rich liquid is decomposed into the lean liquid, and the other end of the regeneration tower is connected with the other end of the absorption tower so that the lean liquid in the regeneration tower flows into the absorption tower. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the structure of the regeneration tower of the embodiment of the present invention.

[0019] Regeneration tower 100;

[0020] Tower body 1;

[0021] Heat exchange assembly 2; heat exchange chamber 21; inner shell 22; outer shell 23; heat exchange tube 24; first tube 241; second tube 242;

[0022] Installation cylinder 3; air permeable member 31; spray assembly 4. DETAILED DESCRIPTION

[0023] 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.

[0024] The regeneration tower according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0025] like Figure 1 As shown, the regeneration tower 100 according to the embodiment of the present invention includes a tower body 1 and a heat exchange component 2 .

[0026] The tower body 1 has a first cavity, a second cavity and a third cavity, which are arranged in sequence along the vertical direction and are connected to each other along the vertical direction, and the first cavity is suitable for passing rich liquid. Specifically, Figure 1 As shown, the tower body 1 has a first chamber, a second chamber and a third chamber. The first chamber is arranged above the second chamber and is connected to the second chamber. The second chamber is arranged above the third chamber and is connected to the third chamber. Rich liquid adsorbed with carbon dioxide can be introduced into the first chamber, and the rich liquid flows into the second chamber and the third chamber in sequence through the first chamber.

[0027] The heat exchange component 2 is arranged in the second chamber and includes a storage chamber and a heat exchange chamber 21. The storage chamber is connected to the first chamber so that the rich liquid in the first chamber flows into the storage chamber. One end of the heat exchange chamber 21 is connected to the storage chamber so that the rich liquid in the storage chamber flows into the heat exchange chamber 21. One end of the heat exchange chamber 21 is suitable for passing high-temperature steam so that the high-temperature steam heats the rich liquid through the heat exchange chamber 21 to decompose the rich liquid into lean liquid and carbon dioxide. The heat exchange chamber 21 is connected to the third chamber so that the lean liquid and carbon dioxide decomposed by the heat exchange chamber 21 flow into the third chamber. The heat exchange component 2 is spaced apart from the inner circumference of the second chamber to form an airflow channel so that the carbon dioxide in the third chamber flows into the first chamber through the airflow channel. Specifically, Figure 1 As shown, the storage chamber opening is arranged upward and is connected with the first chamber, so that the storage chamber can temporarily store the rich liquid flowing out of the first chamber, the inlet of the heat exchange chamber 21 is connected with the storage chamber, so that the rich liquid in the storage chamber flows into the heat exchange chamber 21, and the inlet of the heat exchange chamber 21 can pass high-temperature steam, and the high-temperature steam heats the rich liquid through the heat exchange chamber 21, so that the rich liquid is decomposed into carbon dioxide and lean liquid by high temperature, and the outlet of the heat exchange chamber 21 is connected with the third chamber, so that the decomposed carbon dioxide and lean liquid flow into the third chamber, and the outer peripheral surface of the heat exchange component 2 is spaced from the inner peripheral surface of the second chamber to form an airflow channel, so that the decomposed carbon dioxide flows into the first chamber through the airflow channel, and the decomposed lean liquid is stored in the third chamber.

[0028] The regeneration tower 100 of the embodiment of the present invention is provided with a heat exchange component 2. The heat exchange component 2 is arranged in the tower body 1 to heat the rich liquid in the tower body 1 to decompose the rich liquid into a lean liquid. The heat exchange component 2 and the regeneration tower 100 are integrated. Compared with the related art, the equipment structure layout is simplified and the device footprint is reduced.

[0029] In some embodiments, the heat exchange assembly 2 includes an inner shell 22 , an outer shell 23 and a heat exchange tube 24 .

[0030] The outer shell 23 is sleeved on the inner shell 22, and the inner circumference of the outer shell 23 and the outer circumference of the inner shell 22 are spaced apart to form a heat exchange cavity 21, the inner circumference of the inner shell 22 defines a storage cavity, and the outer circumference of the outer shell 23 and the inner circumference of the tower body 1 are spaced apart to form an air flow channel. Figure 1 As shown, the inner shell 22 is arranged in the outer shell 23, and the inner shell 22 is a cylindrical shell with an opening facing upward. The inner circumferential surface of the inner shell 22 defines a storage cavity to store the rich liquid flowing out of the first cavity. The inner circumferential surface of the outer shell 23 and the outer circumferential surface of the inner shell 22 are spaced apart to form a heat exchange cavity 21. High-temperature steam and rich liquid can be introduced into the heat exchange cavity 21, so that the rich liquid and high-temperature steam exchange heat in the heat exchange cavity 21. The outer circumferential surface of the outer shell 23 and the inner circumferential surface of the tower body 1 are spaced apart to form an air flow channel, so that the carbon dioxide in the third cavity flows into the first cavity through the air flow channel.

[0031] In some embodiments, the heat exchange tube 24 is disposed in the heat exchange cavity 21, one end of the heat exchange tube 24 is connected to the inner shell 22, the other end of the heat exchange tube 24 passes through the outer shell 23 and extends into the third cavity, the other end of the heat exchange tube 24 is located in the lean liquid of the third cavity, and the lower part of the outer shell 23 is suitable for passing high-pressure gas. Specifically, Figure 1 As shown, the heat exchange tube 24 surrounds the outer circumference of the inner shell 22 and is arranged in the heat exchange chamber 21. The inlet of the heat exchange tube 24 is connected to the inner shell 22, and the outlet of the heat exchange tube 24 passes through the outer shell 23 and extends into the lean liquid in the third chamber. Since the inner shell 22 is higher than the third chamber, the lean liquid in the heat exchange tube 24 can flow into the third chamber continuously through the siphon effect and the gravity of the lean liquid. There is no need to set up a power device, which reduces the operating cost and processing and manufacturing cost of the regeneration tower 100.

[0032] In some embodiments, the regeneration tower 100 further includes a mounting cylinder 3 and a gas permeable member 31 .

[0033] The lower end of the installation tube 3 is connected to the inner shell 22, and the upper end of the installation tube 3 is connected to the tower body 1. The inner circumference of the installation tube 3 gradually increases from bottom to top. The installation tube 3 is provided with an air outlet hole that penetrates the installation tube 3 in the up and down direction. The air outlet hole is connected to the air flow channel so that the carbon dioxide in the third chamber flows into the first chamber through the air outlet hole. Specifically, Figure 1 As shown, the mounting tube 3 is a horn tube whose cross-sectional area of ​​the inner circumference gradually increases from bottom to top. The lower end of the mounting tube 3 is mounted on the inner shell 22 and is fixedly connected to the inner shell 22 (for example, by welding). Thus, the rich liquid in the first cavity is collected by the mounting tube 3 and flows into the inner shell 22. The mounting tube 3 is provided with an air outlet hole that penetrates the mounting tube 3 in the up-down direction. The air outlet hole is connected to the air flow channel and the first cavity respectively. Thus, the carbon dioxide in the third cavity can flow into the first cavity through the air flow channel and the air outlet hole.

[0034] In some embodiments, the air permeable member 31 is disposed in the air outlet, and the carbon dioxide in the gas channel can flow into the first cavity through the air permeable member 31, and the rich liquid in the first cavity cannot flow into the gas flow channel through the air permeable member 31. Figure 1 As shown, the air permeable member 31 allows gas to pass through but does not allow liquid to pass through. Carbon dioxide can flow into the first cavity through the air permeable member 31, and the rich liquid in the first cavity cannot flow into the air flow channel, thereby preventing the rich liquid and the lean liquid from mixing and ensuring the quality of the lean liquid.

[0035] In some embodiments, there are multiple air outlet holes, which are spaced apart along the circumference of the mounting tube 3, and there are multiple air permeable members 31, which are arranged in a one-to-one correspondence in the multiple air outlet holes. Figure 1As shown, the number of the air outlet holes is equal to the number of the air permeable holes, and a breathable member 31 is provided in each air outlet hole, thereby not only separating the carbon dioxide and the lean liquid, but also ensuring the pressure in the third chamber, the second chamber and the first chamber, ensuring the pressure balance in the tower body 1, preventing the pressure in the third chamber from being too high, causing the third chamber to be damaged, and ensuring the service life of the third chamber.

[0036] In some embodiments, the air permeable member 31 may be any one of a ceramic membrane, a metal membrane, a polymer composite membrane, a glass fiber membrane, etc. Since the ceramic membrane, the metal membrane, the polymer composite membrane, and the glass fiber membrane not only have high temperature resistance, but also allow the carbon dioxide in the third chamber to flow into the first chamber, and prevent the rich liquid in the first chamber from flowing into the third chamber.

[0037] In some embodiments, the heat exchange tube 24 includes a first tube 241 and a second tube 242. The first tube 241 spirally surrounds the outer circumference of the inner shell 22, one end of the first tube 241 is connected to the bottom of the inner shell 22, and the other end of the first tube 241 is connected to the second tube 242. The second tube 242 is a vertical tube extending up and down, and the other end of the second tube 242 passes through the outer shell 23 and extends into the lean liquid in the third chamber. Specifically, Figure 1 As shown, the first tube 241 spirally surrounds the outer circumferential surface of the inner shell 22 and is arranged in the heat exchange chamber 21. The lower end of the first tube 241 is the inlet of the first tube 241 and is connected with the lower end of the inner shell 22, thereby, the rich liquid in the inner shell 22 flows into the first tube 241, the upper end of the first tube 241 is the outlet of the first tube 241 and is connected with the upper end of the second tube 242, and the lower end of the second tube 242 passes through the outer shell 23 and extends into the lean liquid in the third chamber, thereby, the rich liquid in the inner shell 22 passes through the first tube 241 in turn after heat exchange, and then flows into the third chamber through the second tube 242. Since the liquid level of the third chamber is lower than the liquid level of the inner shell 22, and the setting of the air outlet can make the pressures in the first chamber, the second chamber and the third chamber equal, so that the heat exchange tube 24 produces a siphon effect, so that the rich liquid in the inner shell 22 flows continuously into the third chamber.

[0038] It is worth noting that a delivery pump can be arranged in the inner shell 22 or the heat exchange chamber 21 , the inlet of the delivery pump is connected to the inner shell 22 , and the outlet of the delivery pump is connected to the heat exchange tube 24 , and the delivery pump can provide power for the transportation of the rich liquid in the inner shell 22 .

[0039] In some embodiments, the regeneration tower 100 further has an inlet and an outlet, wherein the inlet is disposed on the tower body 1 and adjacent to the top of the tower body 1, the inlet is connected to the first chamber, and the outlet is disposed at the bottom of the tower and connected to the third chamber. Figure 1 As shown, the inlet is connected to the first cavity and is arranged adjacent to the tower body 1, and the rich liquid can flow into the first cavity through the inlet. The outlet is arranged at the bottom of the tower body 1 and is connected to the third cavity, so that the lean liquid is discharged from the tower body 1 through the outlet.

[0040] In some embodiments, the regeneration tower 100 further includes a heating component (not shown in the figure), which is disposed in the heat exchange chamber 21 and is used to heat the rich liquid in the air flow channel. Specifically, the heating component can be a heating resistor, which is disposed on the outer peripheral surface of the inner shell 22 and is located in the heat exchange chamber 21. Therefore, when the temperature in the heat exchange chamber 21 is insufficient, the heating component can be turned on to heat the rich liquid in the heat exchange chamber 21 to heat and decompose the rich liquid into lean liquid and carbon dioxide.

[0041] Since the temperature in the regeneration tower 100 is relatively high, there is liquid-rich steam in the first chamber. Therefore, in some embodiments, the regeneration tower 100 further includes a spray assembly 4, which is disposed in the first chamber and adjacent to the top of the tower. The spray assembly 4 is adapted to be passed with cooling water to cool the steam in the first chamber so as to liquefy the steam in the first chamber. Specifically, Figure 1 As shown, the spray assembly 4 is arranged in the first cavity and adjacent to the tower top. Cooling water is sprayed into the first cavity through the spray assembly 4, so that the steam in the first cavity is liquefied into water droplets to prevent the liquid-rich steam from being discharged from the tower body 1.

[0042] The flue gas treatment system of the embodiment of the present invention includes an absorption tower (not shown in the figure) and a regeneration tower 100 .

[0043] The absorption tower is provided with a lean liquid and is suitable for passing flue gas so that the lean liquid absorbs carbon dioxide in the flue gas to convert the lean liquid into a rich liquid. Thus, the carbon dioxide in the flue gas is absorbed by the absorption tower, and the lean liquid is converted into a rich liquid after absorbing the carbon dioxide.

[0044] The regeneration tower 100 is any of the regeneration towers 100 in the embodiments, one end of the regeneration tower 100 is connected to one end of the absorption tower, so that the rich liquid in the absorption tower flows into the regeneration tower 100 to decompose the rich liquid into the lean liquid, and the other end of the regeneration tower 100 is connected to the other end of the absorption tower, so that the lean liquid in the regeneration tower 100 flows into the absorption tower. Specifically, Figure 1 As shown, the outlet of the absorption tower is connected to the inlet of the regeneration tower 100, and the rich liquid in the absorption tower flows into the regeneration tower 100, thereby decomposing the rich liquid into lean liquid. The outlet of the absorption tower is connected to the inlet of the regeneration tower 100, and the lean liquid in the regeneration tower 100 flows into the absorption tower.

[0045] The flue gas treatment system of the embodiment of the present invention has the advantages of simple structure, low cost, high lean liquid to rich liquid conversion efficiency, etc.

[0046] In the description of the present invention, it is to 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”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", 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.

[0051] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A regeneration tower, characterized in that: include: A tower body, the tower body comprising a first cavity, a second cavity and a third cavity, the first cavity, the second cavity and the third cavity are sequentially arranged in the up-down direction and are connected to each other in the up-down direction, and the first cavity is suitable for introducing rich liquid; A heat exchange component, wherein the heat exchange component is arranged in the second chamber and the heat exchange component includes a storage chamber and a heat exchange chamber, the storage chamber is communicated with the first chamber so that the rich liquid in the first chamber flows into the storage chamber, one end of the heat exchange chamber is communicated with the storage chamber so that the rich liquid in the storage chamber flows into the heat exchange chamber, one end of the heat exchange chamber is suitable for passing high-temperature steam so that the high-temperature steam heats the rich liquid through the heat exchange chamber to decompose the rich liquid into lean liquid and carbon dioxide, the heat exchange chamber is communicated with the third chamber so that the lean liquid and carbon dioxide decomposed by the heat exchange chamber flow into the third chamber, and the heat exchange component is spaced apart from the inner circumferential surface of the second chamber to form an airflow channel so that the carbon dioxide in the third chamber flows into the first chamber through the airflow channel.

2. The regeneration tower according to claim 1, characterized in that: The heat exchange component comprises: An inner shell and an outer shell, wherein the outer shell is sleeved outside the inner shell and the inner circumference of the outer shell and the outer circumference of the inner shell are spaced apart to form the heat exchange cavity, the inner circumference of the inner shell defines the storage cavity, and the outer circumference of the outer shell and the inner circumference of the tower body are spaced apart to form the airflow channel; A heat exchange tube, wherein the heat exchange tube is arranged in the heat exchange cavity, one end of the heat exchange tube is connected to the inner shell, the other end of the heat exchange tube passes through the outer shell and extends into the third cavity, the other end of the heat exchange tube is located in the lean liquid of the third cavity, and the bottom of the outer shell is suitable for passing high-pressure gas.

3. The regeneration tower according to claim 2, characterized in that: Also includes: A mounting tube, wherein the lower end of the mounting tube is connected to the inner shell, the upper end of the mounting tube is connected to the tower body, the cross-sectional area of ​​the inner circumference of the mounting tube gradually increases from bottom to top, and the mounting tube is provided with an air outlet hole penetrating the mounting tube in the up-down direction, the air outlet hole is communicated with the air flow channel, so that the carbon dioxide in the third chamber flows into the first chamber through the air outlet hole; A breathable member is arranged in the air outlet, and the carbon dioxide in the gas channel can flow into the first cavity through the breathable member, and the rich liquid in the first cavity cannot flow into the gas flow channel through the breathable member.

4. The regeneration tower according to claim 3, characterized in that: There are a plurality of air outlet holes, which are spaced apart along the circumference of the mounting tube; there are a plurality of air permeable members, which are arranged in the plurality of air outlet holes in a one-to-one correspondence.

5. The regeneration tower according to claim 3, characterized in that: The air permeable member may be any one of a ceramic membrane, a metal membrane, a polymer composite membrane, a glass fiber membrane, and the like.

6. The regeneration tower according to claim 2, characterized in that: The heat exchange tube includes a first tube and a second tube, the first tube spirally surrounds the outer circumference of the inner shell, one end of the first tube is connected to the bottom of the inner shell, the other end of the first tube is connected to the second tube, the second tube is a vertical tube extending up and down, and the other end of the second tube passes through the outer shell and extends into the lean liquid in the third chamber.

7. The regeneration tower according to claim 1, characterized in that The regeneration tower also has an inlet and an outlet. The inlet is arranged on the tower body and adjacent to the top of the tower body. The inlet is connected to the first chamber. The outlet is arranged at the bottom of the tower and connected to the third chamber.

8. The regeneration tower according to claim 1, characterized in that: It also includes a heating component, which is arranged in the heat exchange cavity and is used to heat the rich liquid in the air flow channel.

9. The regeneration tower according to claim 1, characterized in that: It also includes a spray assembly, which is arranged in the first chamber and adjacent to the tower top, and is suitable for passing cooling water to cool the steam in the first chamber so as to liquefy the steam in the first chamber.

10. A flue gas treatment system, characterized in that: include: an absorption tower, wherein a lean liquid is arranged in the absorption tower and is suitable for passing flue gas, so that the lean liquid absorbs carbon dioxide in the flue gas to convert the lean liquid into a rich liquid; A regeneration tower, wherein the regeneration tower is the regeneration tower of any one of claims 1 to 9, wherein one end of the regeneration tower is connected to one end of the absorption tower so that the rich liquid in the absorption tower flows into the regeneration tower to decompose the rich liquid into a lean liquid, and the other end of the regeneration tower is connected to the other end of the absorption tower so that the lean liquid in the regeneration tower flows into the absorption tower.

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