Carbon dioxide capture device

Abstract

The application provides a carbon dioxide capturing device, comprising: an absorption assembly having a gas inlet and a gas outlet connected in communication and an absorption liquid inlet and an absorption liquid outlet connected in communication; a regeneration tower having a regeneration inlet and a regeneration outlet connected in communication and a reheat inlet and a reheat outlet connected in communication, the regeneration inlet being communicated with the absorption liquid outlet, and the regeneration outlet being communicated with the absorption liquid inlet; a reboiler having a reboil inlet and a reboil outlet connected in communication and a heating inlet and a heating outlet connected in communication, the reheat outlet being communicated with the reboil inlet, the reboil outlet being communicated with the reheat inlet, and the heating inlet being communicated with a heat source; and a waste heat exchanger having a waste heat inlet and a waste heat outlet connected in communication and a first cooling inlet and a first cooling outlet connected in communication, the waste heat inlet being communicated with the heating outlet, the waste heat outlet being communicated with a user end, the first cooling inlet being communicated with the absorption liquid outlet, and the first cooling outlet being communicated with the regeneration inlet. Through the scheme, the problem of cold energy waste can be solved.

Description

Carbon dioxide capture device Technical Field

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

[0002] Global warming is causing significant disruption to human production and daily life, with CO2 being a major culprit in rising temperatures. Therefore, CO2 treatment before emissions from industrial processes is crucial.

[0003] Among related technologies, phase change chemical absorption is a major method for CO2 recovery. The carbon capture system includes an absorption tower and a regeneration tower. In the absorption tower, an absorbent is used to absorb CO2 from the flue gas. After the CO2-rich liquid undergoes phase separation, the CO2 in the rich liquid is desorbed in the regeneration tower, and the CO2 product is obtained in subsequent processes.

[0004] However, there is a waste of cooling energy within carbon capture systems. Summary of the Invention

[0005] This invention provides a carbon dioxide capture device to solve the problem of wasted cooling capacity in carbon capture systems in related technologies.

[0006] According to one aspect of the present invention, a carbon dioxide capture device is provided, comprising: an absorption assembly having a connected air inlet and an air outlet, and a connected absorbent inlet and an absorbent outlet; a regeneration tower having a connected regeneration inlet and a regeneration outlet, and a connected reheat inlet and a reheat outlet, wherein the regeneration inlet and the absorbent outlet are connected, and the regeneration outlet and the absorbent inlet are connected; a reboiler having a connected reboiling inlet and a reboiling outlet, and a connected heating inlet and a heating outlet, wherein the reheat outlet and the reboiling inlet are connected, the reboiling outlet and the reheat inlet are connected, and the heating inlet is connected to a heat source; and a waste heat exchanger having a connected waste heat inlet and a waste heat outlet, and a connected first cooling inlet and a first cooling outlet, wherein the waste heat inlet and the heating outlet are connected, the waste heat outlet is connected to a user end, the first cooling inlet is connected to the absorbent outlet, and the first cooling outlet is connected to the regeneration inlet.

[0007] Furthermore, the carbon dioxide capture device also includes a first lean-rich liquid heat exchanger, which has a first lean liquid inlet and a first lean liquid outlet connected together, as well as a second cooling inlet and a second cooling outlet connected together. The first lean liquid inlet is connected to the regeneration outlet, the first lean liquid outlet is connected to the absorbent liquid inlet, the second cooling inlet is connected to the absorbent liquid outlet, and the second cooling outlet is connected to the regeneration inlet.

[0008] Furthermore, the carbon dioxide capture device also includes a first pipeline, a second cooling outlet and a regeneration inlet connected to both ends of the first pipeline, and the first pipeline also has a connecting port, with the first cooling outlet connected to the connecting port.

[0009] Furthermore, the regeneration tower also has a regeneration gas cooling port, which is connected to the absorbent outlet and is located above the regeneration inlet.

[0010] Furthermore, the carbon dioxide capture device also includes a second lean-rich liquid heat exchanger, which has a second lean liquid inlet and a second lean liquid outlet connected together, as well as a third cooling inlet and a third cooling outlet connected together. The second lean liquid inlet is connected to the first lean liquid outlet, the second lean liquid outlet is connected to the absorbent liquid inlet, and the third cooling inlet is connected to the absorbent liquid outlet. The regeneration gas cooling port includes a first cooling port, and the third cooling outlet is connected to the first cooling port.

[0011] Furthermore, the carbon dioxide capture device also includes a regenerated gas heat exchanger, which includes a regenerated gas inlet and a regenerated gas outlet connected together, as well as a fourth cooling inlet and a fourth cooling outlet connected together. The regeneration tower also has an exhaust port, with the regenerated gas inlet connected to the exhaust port, the regenerated gas outlet connected to the compressor, the fourth cooling inlet connected to the third cooling outlet, and the regenerated gas cooling port also including a second cooling port, with the fourth cooling outlet connected to the second cooling port.

[0012] Furthermore, the carbon dioxide capture device also includes a regenerated gas separator, which has a separation inlet, a separation outlet, and a separation liquid outlet connected together. The separation inlet is connected to the regenerated gas outlet, and the separation outlet is connected to the compressor. The absorption assembly also has an interstage cooling port, and the separation liquid outlet is connected to the interstage cooling port.

[0013] Furthermore, the carbon dioxide capture device also includes a second pipeline, which includes a main pipe and a first branch pipe and a second branch pipe connected to the main pipe. The main pipe is connected to a third cooling outlet, the first branch pipe is connected to a first cooling port, and the second branch pipe is connected to a fourth cooling inlet.

[0014] Furthermore, the carbon dioxide capture device also includes an interstage heater, which includes an interstage heating inlet and an interstage heating outlet connected together, as well as a heating inlet and a heating outlet connected together. The regeneration tower also includes an interstage inlet and an interstage outlet, with the interstage outlet connected to the interstage heating inlet, the interstage inlet connected to the interstage heating outlet, the heating inlet connected to the regeneration outlet, and the heating outlet connected to the absorbent inlet.

[0015] Furthermore, the absorption assembly includes an absorption tower and a phase separation tank that are connected to each other. The air inlet, air outlet, and absorbent liquid inlet are all located in the absorption tower, and the absorbent liquid outlet is located in the phase separation tank.

[0016] According to the technical solution of this invention, the carbon dioxide capture device includes an absorption assembly, a regeneration tower, a reboiler, and a waste heat exchanger. Flue gas containing carbon dioxide is fed into the absorption assembly through its inlet. The absorbent in the absorption assembly absorbs the carbon dioxide, forming a rich solution. After phase separation, the rich solution is fed into the regeneration tower through the absorbent outlet of the absorption assembly and the regeneration inlet. Desorption occurs in the regeneration tower. Simultaneously, the rich solution is further fed into the reboiler for reheat desorption through the reheat outlet of the regeneration tower and the reboiling inlet of the reboiler. It is then fed back into the regeneration tower through the reboiling outlet and reheat inlet. In the regeneration tower and reboiler, the rich solution desorbs carbon dioxide, becoming a lean solution containing absorbent. The lean solution is then returned to the absorption assembly through the regeneration outlet and absorbent inlet. Furthermore, the heat source entering the reboiler through the heating inlet undergoes heat exchange and is then transported to the waste heat exchanger via the heating outlet and the waste heat inlet. The rich liquid from the absorbent outlet is then transported to the waste heat exchanger through the first cooling inlet to cool the heat source after heat exchange, and then transported to the user end for waste heat utilization. The heat-absorbing rich liquid is then transported to the regeneration tower through the first cooling outlet. By utilizing the cooling capacity of the rich liquid to cool the heat source after reboiler use, the utilization rate of the rich liquid's cooling capacity is improved. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0018] Figure 1 shows a schematic diagram of the structure of a carbon dioxide capture device provided according to an embodiment of the present invention.

[0019] The above figures include the following reference numerals:

[0020] 10. Absorption assembly; 11. Absorption tower; 12. Phase separation tank;

[0021] 20. Regeneration tower;

[0022] 30. Reboiler;

[0023] 40. Waste heat exchanger;

[0024] 50. First lean / rich liquid heat exchanger; 51. First pipeline;

[0025] 60. Second lean / rich liquid heat exchanger; 61. Main pipe; 62. First branch pipe; 63. Second branch pipe;

[0026] 70. Regenerated gas heat exchanger;

[0027] 80. Regenerated gas separator;

[0028] 90. Interstage heater. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] As shown in Figure 1, this embodiment of the invention provides a carbon dioxide capture device, which includes an absorption assembly 10, a regeneration tower 20, a reboiler 30, and a waste heat exchanger 40. The absorption assembly 10 has a connected air inlet and an air outlet, as well as a connected absorbent inlet and an absorbent outlet. The regeneration tower 20 has a connected regeneration inlet and a regeneration outlet, as well as a connected reheat inlet and a reheat outlet. The regeneration inlet and the absorbent outlet are connected, and the regeneration outlet and the absorbent inlet are connected. The reboiler 30 has a connected reboiling inlet and a reboiling outlet, as well as a connected heating inlet and a heating outlet. The reheat outlet is connected to the reboiling inlet, the reboiling outlet is connected to the reheat inlet, and the heating inlet is connected to a heat source. The waste heat exchanger 40 has a connected waste heat inlet and a waste heat outlet, as well as a connected first cooling inlet and a first cooling outlet. The waste heat inlet is connected to the heating outlet, the waste heat outlet is connected to the user end, the first cooling inlet is connected to the absorbent outlet, and the first cooling outlet is connected to the regeneration inlet.

[0031] According to the technical solution of this invention, the carbon dioxide capture device includes an absorption assembly 10, a regeneration tower 20, a reboiler 30, and a waste heat exchanger 40. Flue gas containing carbon dioxide is transported into the absorption assembly 10 through its inlet. The absorbent in the absorption assembly 10 absorbs the carbon dioxide, forming a rich liquid. After phase separation, the rich liquid is transported into the regeneration tower 20 through the absorbent outlet of the absorption assembly 10 and the regeneration inlet of the regeneration tower 20. Desorption occurs in the regeneration tower 20. Simultaneously, the rich liquid is further transported to the reboiler 30 for reheating and desorption through the reheat outlet of the regeneration tower 20 and the reboiling inlet of the reboiler 30. It is then transported back to the regeneration tower 20 through the reboiling outlet and reheat inlet. Carbon dioxide is desorbed from the rich liquid in the regeneration tower 20 and the reboiler 30, becoming a lean liquid containing absorbent. The lean liquid is then returned to the absorption assembly 10 through the regeneration outlet and absorbent inlet. Furthermore, the heat source entering the reboiler 30 through the heating inlet and then being transported to the waste heat exchanger 40 via the heating outlet and the waste heat inlet. The rich liquid from the absorbent outlet is then transported to the waste heat exchanger 40 through the first cooling inlet to cool the heat source after heat exchange, and then transported to the user end for waste heat utilization. The heat-absorbing rich liquid is then transported to the regeneration tower 20 through the first cooling outlet. By utilizing the cooling capacity of the rich liquid to cool the heat source utilized by the reboiler 30, the utilization rate of the rich liquid's cooling capacity is improved.

[0032] As shown in Figure 1, the carbon dioxide capture device also includes a first lean-rich liquid heat exchanger 50. The first lean-rich liquid heat exchanger 50 has a first lean liquid inlet and a first lean liquid outlet connected to each other, as well as a second cooling inlet and a second cooling outlet connected to each other. The first lean liquid inlet is connected to the regeneration outlet, the first lean liquid outlet is connected to the absorbent inlet, the second cooling inlet is connected to the absorbent outlet, and the second cooling outlet is connected to the regeneration inlet. The rich liquid entering the first lean-rich liquid heat exchanger 50 from the absorbent outlet and the lean liquid entering the first lean-rich liquid heat exchanger 50 from the regeneration outlet can exchange heat within it, using the rich liquid to cool the lean liquid, thereby improving the utilization rate of the rich liquid's cooling capacity.

[0033] Specifically, the lean liquid from the regeneration outlet enters the first lean-rich liquid heat exchanger 50 through the first lean liquid inlet, and after cooling, it is transported to the absorption assembly 10 through the first lean liquid outlet and the absorbent inlet. The rich liquid from the absorbent outlet enters the first lean-rich liquid heat exchanger 50 through the second cooling inlet, and after absorbing heat, it is transported to the regeneration tower 20 through the second cooling inlet and the regeneration inlet.

[0034] As shown in Figure 1, the carbon dioxide capture device also includes a first pipeline 51, with a second cooling outlet and a regeneration inlet connected to both ends of the first pipeline 51. The first pipeline 51 also has a connecting port, with the first cooling outlet connected to the connecting port. The first pipeline 51 enables the connection between the second cooling outlet and the first cooling outlet, allowing the rich liquid, after absorbing heat in the waste heat exchanger 40 and the first lean-rich liquid heat exchanger 50, to enter the regeneration tower 20 through the regeneration inlet.

[0035] As shown in Figure 1, the regeneration tower 20 also has a regeneration gas cooling port, which is connected to the absorbent outlet and is located above the regeneration inlet. The rich liquid output from the absorbent outlet can be used to cool the top of the regeneration tower 20, thereby cooling the carbon dioxide at the desorption point of the regeneration tower 20.

[0036] As shown in Figure 1, the carbon dioxide capture device also includes a second lean-rich liquid heat exchanger 60. The second lean-rich liquid heat exchanger 60 has a second lean liquid inlet and a second lean liquid outlet connected to each other, as well as a third cooling inlet and a third cooling outlet connected to each other. The second lean liquid inlet is connected to the first lean liquid outlet, the second lean liquid outlet is connected to the absorbent liquid inlet, and the third cooling inlet is connected to the absorbent liquid outlet. The regeneration gas cooling port includes a first cooling port, and the third cooling outlet is connected to the first cooling port. The rich liquid entering the second lean-rich liquid heat exchanger 60 from the absorbent liquid outlet and the lean liquid entering the second lean-rich liquid heat exchanger 60 from the first lean liquid outlet can exchange heat within it, using the rich liquid to cool the lean liquid again, thereby improving the utilization rate of the rich liquid's cooling capacity.

[0037] Specifically, the lean liquid from the first lean liquid outlet enters the second lean-rich liquid heat exchanger 60 through the second lean liquid inlet. After cooling, it is transported to the absorption assembly 10 through the second lean liquid outlet and the absorbent inlet. The rich liquid from the absorbent outlet enters the second lean-rich liquid heat exchanger 60 through the third cooling inlet. After absorbing heat, it is transported to the regeneration tower 20 through the third cooling outlet and the first cooling port.

[0038] As shown in Figure 1, the carbon dioxide capture device also includes a regeneration gas heat exchanger 70. The regeneration gas heat exchanger 70 includes a regeneration gas inlet and a regeneration gas outlet connected together, as well as a fourth cooling inlet and a fourth cooling outlet connected together. The regeneration tower 20 also has an exhaust port. The regeneration gas inlet is connected to the exhaust port, the regeneration gas outlet is connected to the compressor, and the fourth cooling inlet is connected to the third cooling outlet. The regeneration gas cooling port also includes a second cooling port, and the fourth cooling outlet is connected to the second cooling port. The rich liquid entering the regeneration gas heat exchanger 70 through the third cooling outlet and the carbon dioxide entering the regeneration gas heat exchanger 70 through the regeneration gas inlet can exchange heat inside the regeneration gas heat exchanger 70. The rich liquid further cools the carbon dioxide, which then enters the regeneration tower 20 through the second cooling port to cool the carbon dioxide at the top of the regeneration tower 20.

[0039] In this embodiment, after the rich liquid in the regenerated gas heat exchanger 70 cools the carbon dioxide, it can re-enter the regeneration tower 20 through the second cooling port to cool the carbon dioxide at the top of the regeneration tower 20, thus forming a two-stage utilization of the rich liquid cooling capacity.

[0040] The first cooling port is located above the second cooling port. Because the rich liquid passing through the regeneration gas heat exchanger 70 is heated, the temperature of the rich liquid entering the regeneration tower 20 through the second cooling port is higher than the temperature of the rich liquid entering the regeneration tower 20 through the first cooling port. Through the first cooling port, the second cooling port, and the regeneration gas heat exchanger 70, carbon dioxide can be cooled in three stages.

[0041] As shown in Figure 1, the carbon dioxide capture device also includes a regenerator gas separator 80. The regenerator gas separator 80 has a liquid outlet and a connected separation inlet and a gas outlet. The separation inlet is connected to the regenerator gas outlet, and the gas outlet is connected to the compressor. The absorption assembly 10 also has an interstage cooling port, and the liquid outlet is connected to the interstage cooling port. The regenerator gas separator 80 can separate the cooled carbon dioxide and condensate, and then the condensate can be transported to the absorption assembly 10 for utilization.

[0042] In this embodiment, the interstage cooling port is located in the middle of the absorption tower 11.

[0043] As shown in Figure 1, the carbon dioxide capture device also includes a second pipeline, which includes a main pipe 61 and a first branch pipe 62 and a second branch pipe 63 connected to the main pipe 61. The main pipe 61 is connected to a third cooling outlet, the first branch pipe 62 is connected to a first cooling port, and the second branch pipe 63 is connected to a fourth cooling inlet. The second pipeline with the above structure has the advantages of simple structure and easy installation.

[0044] As shown in Figure 1, the carbon dioxide capture device also includes an interstage heater 90. The interstage heater 90 includes a connected interstage heating inlet and outlet, as well as a connected heating inlet and outlet. The regeneration tower 20 also includes an interstage inlet and an interstage outlet. The interstage outlet is connected to the interstage heating inlet, the interstage inlet is connected to the interstage heating outlet, the heating inlet is connected to the regeneration outlet, and the heating outlet is connected to the absorbent inlet. Through the interstage heater 90, the lean liquid at the regeneration outlet can be used to heat the rich liquid in the interstage of the regeneration tower 20, thereby raising the temperature of the interstages in the regeneration tower 20 and accelerating the desorption of carbon dioxide.

[0045] As shown in Figure 1, the absorption assembly 10 includes an absorption tower 11 and a phase separation tank 12 connected to each other. The air inlet, air outlet, and absorbent inlet are all located in the absorption tower 11, and the absorbent outlet is located in the phase separation tank 12. The absorption tower 11 can absorb carbon dioxide in the flue gas, which then enters the phase separation tank 12 for phase separation, and finally enters the regeneration tower 20 from the phase separation tank 12.

[0046] In this embodiment, due to the temperature difference between the lean and rich solutions, and because the inlet is located at the lower end and the outlet at the upper end of the absorption tower 11, the flue gas comes into contact with and is adsorbed by the absorbent as it rises within the absorption tower 11, and its temperature gradually decreases. In the regeneration tower 20, the regeneration inlet is located at the upper part and the regeneration outlet at the bottom. The rich solution descends within the regeneration tower 20, releasing carbon dioxide, and its temperature gradually increases.

[0047] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0048] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0049] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0050] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0051] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0052] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A carbon dioxide capture device, characterized in that, The carbon dioxide capture device includes: an absorption assembly (10) having a connected air inlet and an air outlet, and a connected absorbent inlet and an absorbent outlet; a regeneration tower (20) having a connected regeneration inlet and a regeneration outlet, and a connected reheat inlet and a reheat outlet, wherein the regeneration inlet and the absorbent outlet are connected, and the regeneration outlet and the absorbent inlet are connected; a reboiler (30) having a connected reboiling inlet and a reboiling outlet, and a connected heating inlet and a heating outlet, wherein the reheat outlet is connected to the reboiling inlet, the reboiling outlet is connected to the reheat inlet, and the heating inlet is connected to a heat source; and a waste heat exchanger (40) having a connected... The waste heat inlet and outlet are connected to a first cooling inlet and a first cooling outlet. The waste heat inlet is connected to the heating outlet, and the waste heat outlet is connected to the user end. The first cooling inlet is connected to the absorbent outlet, and the first cooling outlet is connected to the regeneration inlet. The carbon dioxide capture device also includes a first lean-rich liquid heat exchanger (50). The first lean-rich liquid heat exchanger (50) has a first lean liquid inlet and a first lean liquid outlet connected to each other, as well as a second cooling inlet and a second cooling outlet connected to each other. The first lean liquid inlet is connected to the regeneration outlet, the first lean liquid outlet is connected to the absorbent inlet, and the second cooling inlet is connected to the absorbent outlet. The regeneration tower (20) is connected to the regeneration inlet, and the second cooling outlet is connected to the regeneration inlet; the regeneration tower (20) also has a regeneration gas cooling port, which is connected to the absorbent outlet and is located above the regeneration inlet; the carbon dioxide capture device also includes a second lean-rich liquid heat exchanger (60), which has a second lean liquid inlet and a second lean liquid outlet connected to each other, as well as a third cooling inlet and a third cooling outlet connected to each other. The second lean liquid inlet is connected to the first lean liquid outlet, the second lean liquid outlet is connected to the absorbent inlet, and the third cooling inlet is connected to the absorbent outlet. The regeneration gas cooling port is located above the regeneration inlet. The device includes a first cooling port, and the third cooling outlet is connected to the first cooling port; the carbon dioxide capture device also includes a regeneration gas heat exchanger (70), the regeneration gas heat exchanger (70) includes a regeneration gas inlet and a regeneration gas outlet connected together, and a fourth cooling inlet and a fourth cooling outlet connected together; the regeneration tower (20) also has an exhaust port, the regeneration gas inlet is connected to the exhaust port, the regeneration gas outlet is connected to the compressor, the fourth cooling inlet is connected to the third cooling outlet, the regeneration gas cooling port also includes a second cooling port, and the fourth cooling outlet is connected to the second cooling port; wherein, the first cooling port is located above the second cooling port.

2. The carbon dioxide capture device according to claim 1, characterized in that, The carbon dioxide capture device further includes a first pipeline (51), the second cooling outlet and the regeneration inlet are respectively connected to both ends of the first pipeline (51), the first pipeline (51) also has a connecting port, and the first cooling outlet is connected to the connecting port.

3. The carbon dioxide capture device according to claim 1, characterized in that, The carbon dioxide capture device further includes a regenerated gas separator (80), which has a liquid separation outlet and a connected separation inlet and a gas separation outlet. The separation inlet is connected to the regenerated gas outlet, and the gas separation outlet is connected to the compressor. The absorption assembly (10) also has an interstage cooling port, and the liquid separation outlet is connected to the interstage cooling port.

4. The carbon dioxide capture device according to claim 1, characterized in that, The carbon dioxide capture device further includes a second pipeline, which includes a main pipe (61) and a first branch pipe (62) and a second branch pipe (63) connected to the main pipe (61). The main pipe (61) is connected to the third cooling outlet, the first branch pipe (62) is connected to the first cooling port, and the second branch pipe (63) is connected to the fourth cooling inlet.

5. The carbon dioxide capture device according to claim 1, characterized in that, The carbon dioxide capture device further includes an interstage heater (90), which includes an interstage heating inlet and an interstage heating outlet connected together, as well as a heating inlet and a heating outlet connected together. The regeneration tower (20) further includes an interstage inlet and an interstage outlet, the interstage outlet being connected to the interstage heating inlet, the interstage inlet being connected to the interstage heating outlet, the heating inlet being connected to the regeneration outlet, and the heating outlet being connected to the absorbent inlet.

6. The carbon dioxide capture device according to claim 1, characterized in that, The absorption assembly (10) includes an absorption tower (11) and a phase separation tank (12) connected to each other. The air inlet, the air outlet and the absorbent liquid inlet are all located in the absorption tower (11), and the absorbent liquid outlet is located in the phase separation tank (12).

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