Regeneration column and flue gas treatment device

Abstract

The application discloses a regeneration tower and a flue gas treatment device. The regeneration tower comprises a tower body and a pressure reducing part. The tower body has a cavity, an outlet, a plurality of first inlets and a plurality of second inlets. The plurality of first inlets and the plurality of second inlets are in communication with the cavity. The plurality of first inlets and the plurality of second inlets are arranged along the circumference of the tower body and are arranged along the up-down direction. The outlet is adapted to be in communication with a reboiler. The pressure reducing part comprises a plurality of passages. The plurality of passages are arranged along the circumference of the tower body in sequence. The passages extend along the up-down direction. The upper end of the passage is in communication with an adjacent passage. The lower end of the passage is in communication with another adjacent passage. The two ends of the passage are in communication with the first inlet and the second inlet. At least one passage is adapted to be in communication with the reboiler. The regeneration tower has the advantages of simple structure, good regeneration effect, long service life and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of flue gas treatment, in particular, to a regenerator and a flue gas treatment device. BACKGROUND

[0002] The flue gas discharged by a coal-fired boiler is generally treated by high-temperature adsorption in an adsorption tower. High-temperature flue gas at a temperature of about 200℃ is introduced into the adsorption tower, and the pollutants (sulfides and nitrogen oxides) in the high-temperature flue gas are adsorbed and removed by the adsorbent in the adsorption tower. The adsorbent saturated with adsorption is transported into a regenerator for heating and desorption regeneration. The pollutants desorbed from the adsorbent are recovered for reuse, and the adsorbent is regenerated.

[0003] In the related art, the rich liquid is heated by a reboiler and then enters the regenerator to promote the regeneration of the rich liquid and improve the regeneration effect. The rich liquid heated by the reboiler forms a gas-liquid mixture of gas and liquid, which has a large impact on the internals when entering the regenerator, and the non-uniform distribution of gas and liquid affects the regeneration effect. SUMMARY

[0004] The present application aims to at least partially solve one of the technical problems in the related art.

[0005] To this end, an embodiment of the present application proposes a regenerator with small impact on the internals and good regeneration effect.

[0006] An embodiment of the present application proposes a flue gas treatment device with simple structure and low cost.

[0007] The regenerator according to an embodiment of the present application comprises: a tower body having a chamber, an outlet, a plurality of first inlets and a plurality of second inlets, the plurality of first inlets and the plurality of second inlets are in communication with the chamber, the plurality of first inlets and the plurality of second inlets are arranged in a circumferential direction of the tower body and are arranged in an up-down direction, and the outlet is adapted to be in communication with a reboiler so that the rich liquid in the tower body flows into the reboiler to heat the rich liquid into a gas-liquid mixture by the reboiler; a pressure reduction member comprising a plurality of passages, the plurality of passages are arranged in the circumferential direction of the tower body in sequence, the passages extend in the up-down direction, the upper end of the passage is in communication with an adjacent one of the passages, the lower end of the passage is in communication with another adjacent one of the passages, the two ends of the passage are in communication with the first inlet and the second inlet respectively, and at least one of the passages is adapted to be in communication with the reboiler so that the gas-liquid mixture flowing out of the reboiler flows into the first inlet and the second inlet.

[0008] The regenerating tower of the embodiment of the present application is provided with a first inlet, a second inlet and a pressure reducing member, so that the gas-liquid mixture can flow in multiple channels, thereby reducing the flow rate of the gas-liquid mixture, preventing the gas-liquid mixture from flowing into the tower body and impacting the inner member too much, prolonging the service life of the regenerating tower, and improving the distribution effect of the gas-liquid mixture, thereby improving the regeneration effect of the regenerating tower.

[0009] In some embodiments, in the projection plane in the up-down direction, the multiple first inlets and the multiple second inlets are alternately arranged along the circumference of the tower body.

[0010] In some embodiments, the multiple channels include multiple first channels and multiple second channels, the multiple first channels and the multiple second channels are alternately arranged along the circumference of the tower body, the first channels extend from top to bottom and are inclined away from one side of the second channels, the second channels extend from top to bottom and are inclined away from one side of the first channels, the upper end of the first channel is communicated with the upper end of one of the second channels adjacent thereto, the lower end of the first channel is communicated with the lower end of another one of the second channels adjacent thereto, the upper end of the first channel is communicated with the first inlet, and the lower end of the second channel is communicated with the second inlet.

[0011] In some embodiments, the tower body includes an outer tower and an inner tower, the inner tower is arranged in the outer tower, and the inner circumferential surface of the outer tower and the outer circumferential surface of the inner tower are arranged in the inner-outer direction to form a mounting cavity, the pressure reducing member is arranged in the mounting cavity and surrounds the outer circumferential surface of the inner-outer, the outer tower is provided with a first port and a second port penetrating the outer tower, the inner tower is provided with a third port penetrating the inner tower, the first port and the third port are communicated to form the outlet, the pressure reducing member is adapted to be communicated with the reboiler through the second port, and the first inlet and the second inlet are formed on the inner tower.

[0012] In some embodiments, the pressure reducing member is a heat exchange pipe, the heat exchange pipe is arranged in the channel, the heat exchange pipe is adapted to be communicated with the reboiler, and the inner circumferential surface of the heat exchange pipe defines the channel, so that the gas-liquid mixture flowing out of the reboiler flows into the heat exchange pipe, the heat exchange pipe is arranged in the mounting cavity and surrounds the inner tower, so that the gas-liquid mixture in the heat exchange pipe heats the rich liquid in the inner tower, and the heat exchange pipe is communicated with the multiple first inlets and the multiple second inlets respectively, so that the gas-liquid mixture in the heat exchange pipe flows into the first inlets and the second inlets.

[0013] In some embodiments, the regenerating tower further includes a flow valve, the flow valve is arranged on the pressure reducing member and communicated with the channel, so that the flow valve controls the flow rate of the flow into the pressure reducing member.

[0014] In some embodiments, the number of the first inlets is 3-5, and / or the number of the second inlets is 3-5.

[0015] In some embodiments, the distance between the center line of the first inlet and the center line of the second inlet is 1.4-1.5 m in the projection plane perpendicular to the inside-outside direction.

[0016] In some embodiments, the regeneration tower further comprises a plurality of first liquid distributors and a plurality of second liquid distributors, the plurality of first liquid distributors are arranged in the plurality of first inlets one by one, so that the gas-liquid mixture flowing out of the reboiler flows into the tower body uniformly through the first liquid distributors, and the plurality of second liquid distributors are arranged in the second inlets one by one, so that the gas-liquid mixture flowing out of the reboiler flows into the tower body uniformly through the second liquid distributors.

[0017] The flue gas treatment device according to the embodiments of the present application comprises: an absorption tower, the absorption tower is provided with lean liquid and is adapted to pass in flue gas, so that the lean liquid absorbs carbon dioxide in the flue gas to convert the lean liquid into rich liquid; a regeneration tower, the regeneration tower is the regeneration tower of any one of the above embodiments, one end of the regeneration tower is in communication with 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 lean liquid, the other end of the regeneration tower is in communication 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 DRAWINGS

[0018] Figure 1 is a structural schematic diagram of the flue gas treatment device according to the embodiments of the present application.

[0019] The flue gas treatment device 100;

[0020] The absorption tower 1;

[0021] The regeneration tower 2; the chamber 21; the outlet 22; the first inlet 23; the second inlet 24; the outer tower 25; the inner tower 26;

[0022] The reboiler 3;

[0023] The pressure reducing piece 4; the heat exchange pipe 41; the channel 42; the first channel 421; the second channel 422; the flow valve 5. DETAILED DESCRIPTION

[0024] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0025] The regeneration tower 2 according to the embodiments of the present application is described below with reference to the accompanying drawings.

[0026] As Figure 1 shown, the regeneration tower 2 according to the embodiment of the present application comprises a tower body and a pressure reducing member 4.

[0027] The tower body has a chamber 21, an outlet 22, a plurality of first inlets 23 and a plurality of second inlets 24, the plurality of first inlets 23 and the plurality of second inlets 24 are both in communication with the chamber 21, the plurality of first inlets 23 and the plurality of second inlets 24 are both arranged along the circumferential direction of the tower body and arranged along the up-down direction, and the outlet 22 is adapted to be in communication with the reboiler 3 so that the rich liquid in the tower body flows into the reboiler 3 to heat the rich liquid into a gas-liquid mixture by the reboiler 3. Specifically, as Figure 1 shown, the tower body is a tower body extending along the up-down direction, the outlet 22, the plurality of first inlets 23 and the plurality of second inlets 24 are all formed on the tower body and arranged adjacent to the bottom of the tower body along the up-down direction, the outlet 22 is in communication with the inlet of the reboiler 3 so that the rich liquid in the tower body flows into the reboiler 3, and the plurality of first inlets 23 and the plurality of second inlets 24 are both in communication with the outlet of the reboiler 3 so that the gas-liquid mixture heated by the reboiler 3 flows into the tower body through the plurality of first inlets 23 and the plurality of second inlets 24.

[0028] The pressure reducing member 4 comprises a plurality of passages 42, the plurality of passages 42 are arranged along the circumferential direction of the tower body in sequence, the passage 42 extends along the up-down direction, the upper end of the passage 42 is in communication with the passage 42 adjacent to the left side, the lower end of the passage 42 is in communication with the passage 42 adjacent to the right side, and the upper and lower ends of the passage 42 are in communication with the first inlet 23 and the second inlet 24 respectively, and at least one passage 42 is adapted to be in communication with the reboiler 3 so that the gas-liquid mixture flowing out of the reboiler 3 flows into the first inlet 23 and the second inlet 24. Specifically, as Figure 1 shown, the pressure reducing member 4 surrounds the outer circumferential surface of the tower body and extends along the circumferential direction of the tower body, the plurality of passages 42 are arranged along the circumferential direction of the tower body in sequence, the upper end of the passage 42 is in communication with the upper end of the passage 42 adjacent to the left side, the lower end of the passage 42 is in communication with the passage 42 adjacent to the right side, the upper and lower ends of the passage 42 are in communication with the first inlet 23 and the second inlet 24 respectively, and one of the passages 42 is in communication with the outlet of the reboiler 3, thereby making the gas-liquid mixture in the reboiler 3 flow into the passage 42 and flow into the first inlet 23 and the second inlet 24 through the passage 42.

[0029] The regeneration tower 2 of this embodiment is equipped with a pressure reducing element 4. The gas-liquid mixture in the reboiler 3 flows into the pressure reducing element 4 through the pressure reducing element 4. Since the pressure reducing element 4 is provided with multiple channels 42, the gas-liquid mixture can flow in multiple channels 42, thereby reducing the flow rate of the gas-liquid mixture and preventing the gas-liquid mixture from flowing into the tower body and causing excessive impact on the internal components, thus extending the service life of the regeneration tower 2. In addition, multiple first inlets 23 and multiple second inlets 24 are provided on the tower body to ensure that the gas-liquid mixture flows into the tower body evenly, improving the distribution effect of the gas-liquid mixture, thereby improving the regeneration effect of the regeneration tower 2.

[0030] In some embodiments, the plurality of channels 42 includes a plurality of first channels 421 and a plurality of second channels 422, which are alternately arranged circumferentially along the tower body. The first channels 421 extend from top to bottom and are inclined on the side away from the second channels 422. The second channels 422 extend from top to bottom and are inclined on the side away from the first channels 421. The upper end of the first channel 421 is connected to the upper end of one of its adjacent second channels 422, and the lower end of the first channel 421 is connected to the lower end of another of its adjacent second channels 422. The upper end of the first channel 421 is connected to the first inlet 23, and the lower end of the second channel 422 is connected to the second inlet 24. Specifically, the number of multiple first channels 421 and multiple second channels 422 are equal and arranged sequentially along the circumference of the tower body. The first channels 421 extend downwards and slope from right to left, while the second channels 422 extend downwards and slope from left to right. The upper end of the first channel 421 is connected to the upper end of the adjacent second channel 422 on the right, and the lower end of the first channel 421 is connected to the lower end of the adjacent second channel 422 on the left. The upper end of the first channel 421 is connected to the first inlet 23, and the lower end of the first channel 421 is connected to the second channel 422. This allows the gas-liquid mixture to flow continuously within the pressure reducing element 4, avoiding dead zones and making the pressure reducing element 4 more rationally positioned.

[0031] In some embodiments, the tower body includes an outer tower 25 and an inner tower 26. The inner tower 26 is disposed within the outer tower 25, and the inner circumferential surface of the outer tower 25 and the outer circumferential surface of the inner tower 26 are spaced apart along the inner and outer directions to form a mounting cavity. A pressure reducing member 4 is disposed within the mounting cavity and surrounds the inner and outer circumferential surfaces. The outer tower 25 has a first opening and a second opening penetrating the outer tower 25, and the inner tower 26 has a third opening penetrating the inner tower 26. The first opening and the third opening are connected to form an outlet 22. The pressure reducing member 4 passes through the second opening and is adapted to communicate with a reboiler 3. A first inlet 23 and a second inlet 24 are formed on the inner tower 26. Specifically, as shown... Figure 1As shown, the inner tower 26 is located inside the outer tower 25, and the outer circumferential surface of the inner tower 26 and the inner circumferential surface of the outer tower 25 are spaced apart to form an installation cavity, providing an installation base for the pressure reducing component 4, preventing the pressure reducing component 4 from being exposed to the outside and causing wear, thus extending the service life of the pressure reducing component 4. The first port and the third port are spaced apart along the inner and outer directions. The inlet of the reboiler 3 is connected to the tower body through the first port and the third port via a pipe, and the outlet of the reboiler 3 is connected to the inlet of the pressure reducing component 4 through the second port. Multiple first inlets 23 and multiple second inlets 24 are formed on the inner tower 26, thereby making the tower body arrangement more reasonable.

[0032] In some embodiments, the pressure reducing element 4 is a heat exchange tube 41, which is disposed in the channel 42. The heat exchange tube 41 is adapted to communicate with the reboiler 3 and the inner circumferential surface of the heat exchange tube 41 defines the channel 42 so that the gas-liquid mixture flowing out of the reboiler 3 flows into the heat exchange tube 41. The heat exchange tube 41 is disposed in the mounting cavity and surrounds the inner tower so that the gas-liquid mixture in the heat exchange tube 41 heats the rich liquid in the inner tower. The heat exchange tube 41 is respectively connected to a plurality of first inlets 23 and a plurality of second inlets 24 so that the gas-liquid mixture in the heat exchange tube 41 flows into the first inlets 23 and the second inlets 24.

[0033] Specifically, such as Figure 1 As shown, the heat exchange tube 41 includes multiple first sub-tubes and multiple second sub-tubes, which are alternately arranged circumferentially along the inner tower 26. The top and bottom of each first sub-tube are connected to its two adjacent sub-tubes. The first sub-tubes extend from top to bottom and slope from right to left, while the second sub-tubes extend from top to bottom and slope from left to right. The multiple first and second sub-tubes make the heat exchange tube 41 generally wavy. The heat exchange tube 41 surrounds the outer circumferential surface of the inner tower and is located within the mounting cavity. The inner circumferential surface of the heat exchange tube 41 defines a channel 42. Thus, the high-temperature gas-liquid mixture generated by the reboiler 3 can be utilized. The gas-liquid mixture heats the rich liquid in the inner tower 26 through the heat exchange tube 41, improving the heat utilization rate and reducing the temperature of the gas-liquid mixture to reduce its flow rate. The heat exchange tube 41 is provided with multiple first connecting ports and multiple second connecting ports. The first connecting ports are formed at the upper end of the first sub-tube, and the second connecting ports are formed at the lower end of the second sub-tube. The multiple first connecting ports are connected to multiple first inlets 23 one-to-one, and the multiple second connecting ports are connected to multiple second inlets 24 one-to-one, so that the gas-liquid mixture in the heat exchange tube 41 flows into the tower body through the multiple first connecting ports and multiple second connecting ports.

[0034] In some embodiments, the regeneration tower 2 further includes a flow valve 5, which is disposed on the pressure reducing element 4 and communicates with the channel 42, so that the flow valve 5 controls the flow rate flowing into the pressure reducing element 4. Specifically, as Figure 1As shown, the inlet of flow valve 5 is connected to the outlet of reboiler 3, and the outlet of flow valve 5 is connected to the inlet of pressure reducing valve. Thus, the flow rate of the gas-liquid mixture flowing into pressure reducing element 4 can be controlled by flow valve 5.

[0035] In some embodiments, the number of multiple first inlets 23 is 3-5, and / or the number of multiple second inlets 24 is 3-5. Specifically, as Figure 1 As shown, the number of first inlets 23 can be any one of 3, 4, or 5, and the number of second inlets 24 can also be any one of 3, 4, or 5. When the number of first inlets 23 and second inlets 24 is less than 3, the openings of the first inlets 23 and second inlets 24 will be larger in order to ensure the regeneration efficiency of the regeneration tower 2, resulting in a decrease in the local structural strength of the tower body. When the number of first inlets 23 and second inlets 24 is greater than 5, the number of first inlets 23 and second inlets 24 will also lead to a decrease in the local structural strength of the tower body. Therefore, the number of first inlets 23 and second inlets 24 is 3-5, which ensures the regeneration efficiency of the regeneration tower 2 while also ensuring the strength and service life of the tower body.

[0036] In some embodiments, within the vertical projection plane, a plurality of first inlets 23 and a plurality of second inlets 24 are alternately arranged at intervals along the circumference of the tower body. Specifically, as shown in... Figure 1 As shown, the number of first inlets 23 and second inlets 24 are equal, and multiple first inlets 23 and multiple second inlets 24 are alternately arranged along the circumference of the tower body, thereby making the gas-liquid mixture more evenly distributed throughout the tower body.

[0037] In some embodiments, the distance between the centerline of the first inlet 23 and the centerline of the second inlet 24 in a projection plane orthogonal to the inward and outward directions is 1.4m-1.5m. Specifically, as shown... Figure 1 As shown, the distance between the centerline of the first inlet 23 and the centerline of the second inlet 24 is any one of 1.4m, 1.42m, 1.44m, 1.46m, 1.48m and 1.5m. When the centerline of the first inlet 23 and the centerline of the second inlet 24 is less than 1.4m, the distance between the first inlet 23 and the second inlet 24 will be too small, resulting in a decrease in the local structural strength of the regeneration tower 2. When the centerline of the first inlet 23 and the centerline of the second inlet 24 is greater than 1.5m, the distance between the first inlet 23 and the second inlet 24 will be too large, resulting in an increase in the overall height of the tower body, thereby increasing the processing and manufacturing cost of the regeneration tower 2.

[0038] In some embodiments, the regeneration tower 2 further includes a plurality of first liquid distributors (not shown in the figure) and a plurality of second liquid distributors (not shown in the figure). The plurality of first liquid distributors are arranged one-to-one within a plurality of first inlets 23, so that the gas-liquid mixture flowing out of the reboiler 3 flows evenly into the tower body through the first liquid distributors. The plurality of second liquid distributors are arranged one-to-one within a second inlet 24, so that the gas-liquid mixture flowing out of the reboiler 3 flows evenly into the tower body through the second liquid distributors. Thus, the first liquid distributors and second liquid distributors ensure that the gas-liquid mixture can be evenly distributed to different positions in the tower body, improving mass transfer efficiency and thereby improving the efficiency of rich-liquid to lean-liquid conversion.

[0039] like Figure 1 As shown, the flue gas treatment device 100 of this embodiment includes an absorption tower 1 and a regeneration tower 2.

[0040] Absorber 1 contains lean liquor and is suitable for introducing flue gas, so that the lean liquor absorbs carbon dioxide in the flue gas and transforms into rich liquor. Thus, carbon dioxide in the flue gas is absorbed by absorber 1, and the lean liquor is transformed into rich liquor after absorbing carbon dioxide.

[0041] Regeneration tower 2 is any one of the regeneration towers in the above embodiments. One end of regeneration tower 2 is connected to one end of absorption tower 1 so that the rich liquid in absorption tower 1 flows into regeneration tower 2 to decompose the rich liquid into lean liquid. The other end of regeneration tower 2 is connected to the other end of absorption tower 1 so that the lean liquid in regeneration tower 2 flows into absorption tower 1. Specifically, as shown... Figure 1 As shown, the outlet of absorption tower 1 is connected to the inlet of regeneration tower 2. The rich liquid in absorption tower 1 flows into regeneration tower 2, thereby decomposing the rich liquid into lean liquid. The outlet of absorption tower 1 is connected to the inlet of regeneration tower 2, so that the lean liquid in regeneration tower 2 flows into absorption tower 1.

[0042] The flue gas treatment device 100 of this invention has the advantages of simple structure, low cost, and high efficiency in lean liquid to rich liquid conversion.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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 regeneration tower, characterized in that, include: The tower body has a chamber, an outlet, a plurality of first inlets and a plurality of second inlets, all of which are connected to the chamber. The plurality of first inlets and the plurality of second inlets are spaced apart along the circumference of the tower body and spaced apart along the vertical direction. The outlet is adapted to be connected to a reboiler so that the rich liquid in the tower body flows into the reboiler so that the reboiler heats the rich liquid into a gas-liquid mixture. A pressure-reducing device includes multiple channels arranged sequentially along the circumference of the tower body. Each channel extends vertically, with its upper end communicating with an adjacent channel and its lower end communicating with another adjacent channel. Both ends of each channel are respectively connected to a first inlet and a second inlet. At least one channel is adapted to communicate with the reboiler so that the gas-liquid mixture flowing out of the reboiler can flow into the first inlet and the second inlet. The tower body includes an outer tower and an inner tower. The inner tower is disposed inside the outer tower, and the inner circumferential surfaces of the outer tower and the inner tower are spaced apart along the inward and outward directions to form an installation cavity. The pressure reducing element is a heat exchange tube, which is disposed in the channel. The heat exchange tube is adapted to communicate with the reboiler, and the inner circumferential surface of the heat exchange tube defines the channel so that the gas-liquid mixture flowing out of the reboiler flows into the heat exchange tube. The heat exchange tube is disposed in the installation cavity and surrounds the inner tower so that the gas-liquid mixture in the heat exchange tube heats the rich liquid in the inner tower, thereby reducing the temperature of the gas-liquid mixture and reducing the flow rate of the gas-liquid mixture.

2. The regeneration tower according to claim 1, characterized in that, Within the vertical projection plane, multiple first inlets and multiple second inlets are alternately arranged at intervals along the circumference of the tower body.

3. The regeneration tower according to claim 1, characterized in that, The plurality of channels include a plurality of first channels and a plurality of second channels, which are alternately arranged along the circumference of the tower body. The first channels extend from top to bottom and are inclined away from the side of the second channels. The second channels extend from top to bottom and are inclined away from the side of the first channels. The upper end of the first channel is connected to the upper end of an adjacent second channel, and the lower end of the first channel is connected to the lower end of another adjacent second channel. The upper end of the first channel is connected to the first inlet, and the lower end of the second channel is connected to the second inlet.

4. The regeneration tower according to claim 1, characterized in that, The pressure reducing element is disposed within the mounting cavity and surrounds the outer and inner peripheral surfaces. The outer tower has a first port and a second port penetrating through the outer tower, and the inner tower has a third port penetrating through the inner tower. The first port and the third port are connected to form the outlet. The pressure reducing element passes through the second port to communicate with the reboiler. The first inlet and the second inlet are formed on the inner tower.

5. The regeneration tower according to claim 4, characterized in that, The heat exchange tube is connected to a plurality of first inlets and a plurality of second inlets, so that the gas-liquid mixture in the heat exchange tube flows into the first inlets and the second inlets.

6. The regeneration tower according to claim 1, characterized in that, It also includes a flow valve, which is disposed on the pressure reducing element and communicates with the channel, so that the flow valve controls the flow rate flowing into the pressure reducing element.

7. The regeneration tower according to claim 1, characterized in that, The quantity of the first import is 3-5, and / or the quantity of the second import is 3-5.

8. The regeneration tower according to claim 1, characterized in that, Within a projection plane orthogonal to the inward and outward directions, the distance between the centerline of the first inlet and the centerline of the second inlet is 1.4m-1.5m.

9. The regeneration tower according to claim 1, characterized in that, It also includes multiple first liquid distributors and multiple second liquid distributors, with each of the multiple first liquid distributors corresponding to one of the multiple first inlets, so that the gas-liquid mixture flowing out of the reboiler flows evenly into the tower body through the first liquid distributors. Multiple second liquid distributors are installed one-to-one in the second inlet so that the gas-liquid mixture flowing out of the reboiler flows evenly into the tower body through the second liquid distributors.

10. A flue gas treatment device, characterized in that, include: An absorption tower is provided with lean liquid and is adapted to be circulated with flue gas so that the lean liquid absorbs carbon dioxide in the flue gas to convert the lean liquid into rich liquid. A regeneration tower, wherein the regeneration tower is any one of claims 1-9, 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 so that the rich liquid is decomposed 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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