A multi-point re-circulation absorber column and carbon capture system

Abstract

The application discloses a multi-point backflow absorption tower and a carbon capture system, and relates to the technical field of carbon dioxide capture equipment, wherein the multi-point backflow absorption tower comprises an absorption tower body and a backflow assembly; the absorption tower body is provided with a plurality of backflow ports; the plurality of backflow ports are sequentially and spacedly arranged along the axial direction of the absorption tower body; the backflow assembly comprises a rich liquid conveying pipe, a detector and a plurality of backflow pipes; the first valve group is installed on the rich liquid conveying pipe; one end of each backflow pipe is connected to a corresponding backflow port; the second valve group is installed on each backflow pipe; the other end of each backflow pipe is connected to the rich liquid conveying pipe; the detector is used for detecting the carbon dioxide absorption state of the rich liquid in the rich liquid conveying pipe; the pump group is installed on the rich liquid conveying pipe and / or each backflow pipe; and the controller is in communication connection with the pump group, the first valve group, the second valve group and the detector. The above design realizes dynamic adjustment of the rich liquid backflow position and effectively improves the utilization rate of the absorbent.

Description

Technical Field

[0001] This application relates to the field of carbon dioxide capture equipment technology, and in particular to a multi-point reflux absorption tower and carbon capture system. Background Technology

[0002] In existing technologies, the design of marine carbon dioxide absorption devices generally suffers from limitations, primarily manifested in the use of a single-height reflux or a fixed reflux port arrangement. While this approach can meet basic absorption requirements to some extent, it struggles to adapt to the complex demands of varying operating conditions, especially in the marine environment. Because the gas-liquid contact state is easily affected by fluctuations during ship operation, the lack of real-time monitoring and effective control of the rich liquid absorption state at the bottom of the tower can lead to decreased absorption efficiency. Some unabsorbed rich liquid may directly enter the regeneration side, increasing energy consumption or absorbent consumption and reducing the overall system efficiency.

[0003] Therefore, there is an urgent need to propose a new device structure to improve the utilization rate of the absorbent (lean solvent), thereby reducing energy consumption or absorbent consumption and improving the overall system efficiency. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a multi-point reflux absorption tower and carbon capture system that can improve the utilization rate of absorbent, thereby reducing energy consumption or absorbent consumption and improving the overall system efficiency.

[0005] To achieve the above technical objectives, this application provides a multi-point reflux absorption tower, including an absorption tower body and a reflux assembly;

[0006] The absorption tower body is provided with multiple reflux ports above its rich liquid outlet;

[0007] Multiple reflux ports are arranged sequentially at intervals along the axial direction of the absorption tower body;

[0008] The reflux assembly includes a rich liquid delivery pipe, a detector, a controller, and multiple reflux pipes;

[0009] One end of the rich liquid delivery pipe is connected to the rich liquid output port;

[0010] A first valve assembly is installed on the rich liquid delivery pipe;

[0011] One end of each of the reflux pipes is connected to a corresponding reflux port.

[0012] Each of the aforementioned return pipes is equipped with a second valve assembly;

[0013] The other end of each return pipe is connected together to the pipe section on the rich liquid delivery pipe between the rich liquid outlet and the first valve group.

[0014] Pump sets are installed on the rich liquid delivery pipe and / or each of the return pipes to provide return power;

[0015] The detector is used to detect the carbon dioxide absorption status of the rich liquid in the pipe section between the rich liquid outlet and the first valve group on the rich liquid delivery pipe.

[0016] The controller is communicatively connected to the pump group, the first valve group, the second valve group, and the detector.

[0017] Furthermore, both the first valve group and the second valve group include an adjustable first valve body;

[0018] The controller is communicatively connected to the first valve body.

[0019] Furthermore, the first valve body is a regulating valve.

[0020] Furthermore, both the first valve group and the second valve group also include a second valve body;

[0021] The second valve body is connected in series on at least one side of the first valve body.

[0022] Furthermore, both the first valve group and the second valve group also include a third valve body;

[0023] The third valve body is connected in parallel with the first valve body.

[0024] Furthermore, a rich liquid output valve body is connected in series between the rich liquid output port and the rich liquid delivery pipe.

[0025] Furthermore, the second valve body, the third valve body, and the rich liquid output valve body are respectively one of a shut-off valve and a cut-off valve.

[0026] Furthermore, the detector includes at least one of a densitometer, a refractometer, and a conductivity meter, but is not limited to these types.

[0027] Furthermore, when the absorber tower body is a packed tower, the number of reflux ports is consistent with the number of packing sections in the packed tower.

[0028] This application also discloses a carbon capture system, including the aforementioned multi-point reflux absorption tower;

[0029] The gas source inlet of the absorption tower body of the multi-point reflux absorption tower is connected to the gas source to be captured through a gas source delivery pipe.

[0030] The lean liquid inlet of the absorption tower body is connected to the lean liquid tank through a lean liquid delivery pipe;

[0031] The other end of the rich liquid delivery pipe of the multi-point reflux absorption tower is connected to the regeneration device or the rich liquid tank.

[0032] As can be seen from the above technical solutions, the multi-point reflux absorption tower designed in this application has the following beneficial effects:

[0033] The detector monitors the carbon dioxide absorption status of the rich liquid in the rich liquid delivery pipe in real time, and the controller precisely controls the first and second valve groups. The return position and flow rate are dynamically allocated according to the degree of absorption of the rich liquid, which improves the absorption efficiency (absorption amount) of the absorbent for carbon dioxide in the absorption tower body in marine environment (or other complex working environment), avoids the unabsorbed rich liquid from directly entering the regeneration side, thereby reducing energy consumption or absorbent consumption and improving the overall efficiency of the system. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the structure of a multi-point reflux absorption tower provided in this application;

[0036] In the diagram: 100, reflux assembly; 11, first valve group; 12, second valve group; 21, rich liquid delivery pipe; 22, reflux pipe; 31, detector; 32, controller; 41, first valve body; 42, second valve body; 43, third valve body; 44, pump group; 51, rich liquid output valve body; 52, gas source input valve body; 53, lean liquid delivery valve body; 54, clean gas valve body; 61, gas source delivery pipe; 62, lean liquid delivery pipe; 63, clean gas vent pipe; 200, absorption tower body; 201, rich liquid output port; 202, gas source input port; 203, lean liquid input port; 204, clean gas vent port; 205, reflux port. Detailed Implementation

[0037] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the embodiments of this application.

[0038] In the description of the embodiments of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and 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. Therefore, they should not be construed as limitations on the embodiments of this application. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a replaceable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0040] This application discloses a multi-point reflux absorption tower and a carbon capture system.

[0041] Please see Figure 1 An embodiment of a multi-point reflux absorption tower provided in this application includes:

[0042] Absorption tower body 200 and reflux assembly 100.

[0043] The absorption tower body 200 has multiple reflux ports 205 above its rich liquid outlet 201; the multiple reflux ports 205 are arranged sequentially at intervals along the axial direction of the absorption tower body 200. The axial direction refers to the direction parallel to the center line of the absorption tower body 200. Taking the absorption tower body 200 as a vertical configuration as an example, the axial direction can refer to the vertical direction or the height direction.

[0044] The reflux assembly 100 includes a rich liquid delivery pipe 21, a detector 31, a controller 32, and multiple reflux pipes 22. One end of the rich liquid delivery pipe 21 is connected to the rich liquid output port 201. A first valve group 11 is installed on the rich liquid delivery pipe 21. One end of each reflux pipe 22 is connected to a corresponding reflux port 205. A second valve group 12 is installed on each reflux pipe 22. The other end of each reflux pipe 22 is connected to the pipe section of the rich liquid delivery pipe 21 between the rich liquid output port 201 and the first valve group 11. A pump group 44 is installed on the rich liquid delivery pipe 21 and / or each reflux pipe 22 to provide reflux power.

[0045] A first valve group 11 is installed on the rich liquid delivery pipe 21, enabling destination switching (return and normal delivery switching) and maintenance at the equipment level. Taking the example of installing pump groups 44 on both the rich liquid delivery pipe 21 and each return pipe 22, the pump group on the rich liquid delivery pipe 21 can work with the first valve group 11 to control the on / off and / or opening degree of the rich liquid delivery pipe 21, while the pump group 44 on the return pipe 22 can work with the second valve group 12 to control the on / off and / or opening degree of the return pipe 22. If the pump group 44 is only installed on the return pipe 22, then the first valve group 11 can work with the pump group on the regeneration side to control the on / off and / or opening degree of the rich liquid delivery pipe 21.

[0046] Taking the installation of pump set 44 only on the rich liquid delivery pipe 21 as an example, it can be installed on the pipe section of the rich liquid delivery pipe 21 between the rich liquid outlet 201 and the other end of each return pipe 22, providing return power for the return flow. At the same time, this arrangement can also provide delivery power for normal delivery (non-return flow). Under this design, pump set 44 can not only work with the first valve group 11 to realize the on / off and / or opening degree adjustment control of the rich liquid delivery pipe 21, but also work with the second valve group 12 to realize the on / off and / or opening degree adjustment control of the return pipe 22. Compared with the method of installing a pump set 44 independently on each loop pipe 22, this arrangement can save the number of pump sets and reduce installation and maintenance costs. In addition, it should be noted that the pump set 44 designed in this application can itself include the required pre-pump valve group and / or post-pump valve group, which will not be elaborated in detail. Of course, the pump assembly 44 can also use the first valve assembly 11 and the second valve assembly 12 as its own required pre-pump valve assembly and / or post-pump valve assembly. The rich liquid output valve body 51 mentioned later can also be used as the pre-pump valve assembly of the pump assembly 44.

[0047] The detector 31 is used to detect the carbon dioxide absorption status of the rich liquid in the pipe section between the rich liquid outlet 201 and the first valve group 11 on the rich liquid delivery pipe 21; the controller 32 is communicatively connected to the pump group 44, the first valve group 11, the second valve group 12 and the detector 31.

[0048] When the carbon dioxide absorption level (absorption state) of the rich liquid on the rich liquid delivery pipe 21 is detected to be lower than the process requirements, the liquid detector 31 transmits a signal to the controller 32, and then the controller 32 transmits a signal to the first valve group 11 and the second valve group 12. The first valve group 11 is closed, and the corresponding second valve group 12 is activated according to the absorption level (it can be that the second valve group 12 of the corresponding layer is opened, and all other layers are closed, or the opening state of some other layers' second valve groups 12 is adjusted to participate appropriately), so as to allocate the reflux position for different absorption levels.

[0049] When the absorption level is detected to meet the process requirements, the detector 31 transmits a signal to the controller 32, which then transmits a signal to the first valve group 11 and the second valve group 12, controlling the first valve group 11 to open and the second valve group 12 to close. The rich liquid is then smoothly sent to the regeneration side through the rich liquid delivery pipe 21 to complete the absorption process.

[0050] When performing valve group switching control, pump group 44 can be shut down first, and then pump group 44 can be started after the valve group switching control is completed.

[0051] The multi-point reflux absorption tower designed in this application has the following beneficial effects:

[0052] The detector 31 monitors the carbon dioxide absorption status of the rich liquid in the rich liquid delivery pipe 21 in real time, and the controller 32 precisely controls the first valve group 11 and the second valve group 12. The return position and flow rate are dynamically allocated according to the degree of carbon dioxide absorption of the rich liquid, thereby improving the absorption efficiency (absorption amount) of the absorbent for carbon dioxide in the absorption tower body 200 in the marine environment. This prevents the rich liquid that has not fully absorbed carbon dioxide from directly entering the regeneration side, thereby reducing energy consumption or absorbent consumption and improving the overall efficiency of the system.

[0053] The above is Embodiment 1 of a multi-point reflux absorption tower provided in this application. The following is Embodiment 2 of a multi-point reflux absorption tower provided in this application. Please refer to the following for details. Figure 1 .

[0054] Based on the solution of Embodiment 1 above:

[0055] Furthermore, both the first valve group 11 and the second valve group 12 include at least one adjustable first valve body 41, and the controller 32 is communicatively connected to the first valve body 41. This configuration allows the first valve group 11 and the second valve group 12 to flexibly and precisely adjust the opening of the rich liquid delivery pipe 21 and the return pipe 22 according to the instructions of the controller 32. When the carbon dioxide absorption state of the rich liquid changes, the adjustable first valve body 41 can respond quickly, and the first valve bodies 41 on the return pipes 22 of different layers can cooperate with each other at different openings to achieve the corresponding stratified return effect.

[0056] Furthermore, the first valve body 41 is a regulating valve. The regulating valve has excellent flow regulation characteristics, enabling precise control of the flow rate of the rich liquid in the rich liquid delivery pipe 21 and the return pipe 22. It can accurately adjust the valve opening based on the signal received by the controller 32 from the detector 31. Moreover, the regulating valve has a fast response speed, able to react to the controller 32's commands in a short time. In addition, the regulating valve also has excellent linear regulation characteristics; its opening degree has a linear relationship with the flow rate. Through this precise control, the absorption process of carbon dioxide by the absorbent in the absorbent body 200 can be further optimized, improving the performance and efficiency of the entire ship's carbon capture system.

[0057] Furthermore, both the first valve group 11 and the second valve group 12 include a second valve body 42, with the second valve body 42 connected in series on at least one side of the first valve body 41. The second valve body 42 further enhances the reliability of controlling the on / off state and flow rate of the rich liquid delivery pipe 21 and the return pipe 22. When the first valve body 41 requires maintenance, repair, or malfunctions, the second valve body 42 can promptly cut off the corresponding pipeline, preventing abnormal flow of the rich liquid and ensuring the safety and stability of the system. Moreover, during normal system operation, the second valve body 42 works in conjunction with the first valve body 41 to more precisely regulate the flow rate and direction of the rich liquid. When an emergency cutoff is required for the rich liquid delivery pipe 21 or the return pipe 22, the second valve body 42 can respond quickly, reducing unnecessary rich liquid leakage and system losses.

[0058] Furthermore, both the first valve group 11 and the second valve group 12 include a third valve body 43; the third valve body 43 is connected in parallel with the first valve body 41 (parallel modular installation to increase or decrease the number of pipelines). Taking the example that the first valve body 41 is connected in series with the second valve body 42 on both sides, then the first valve body 41 and the second valve body 42 are in the same parallel pipeline, while the third valve body 43 is connected in parallel with the first valve body 41 and the second valve body 42.

[0059] This parallel configuration of the third valve body 43 provides the system with more flow regulation options and redundancy. When the first valve body 41 malfunctions and cannot operate normally, the third valve body 43 can be opened as a backup valve to ensure the normal flow of the rich liquid delivery pipe 21 and the return pipe 22, maintaining the basic operation of the system. Simultaneously, in some cases, the third valve body 43 can work in conjunction with the first valve body 41 to jointly regulate the flow rate of the rich liquid. For example, when a larger flow regulation range is required, the third valve body 43 can be opened simultaneously with the first valve body 41. Through different combinations of their opening degrees, more flexible and precise flow regulation can be achieved, further improving the system's adaptability and stability to different operating conditions. Moreover, during the system's flow regulation process, the parallel structure of the third valve body 43 and the first valve body 41 can complement each other, avoiding the problem of inaccurate regulation caused by the limited regulation capacity of a single valve. This optimizes the absorption effect of the absorbent for carbon dioxide in the absorber body 200, improves the overall performance of the ship's carbon capture system, and enhances the installation and maintenance of offshore applications.

[0060] Furthermore, a rich liquid output valve body 51 is connected in series between the rich liquid output port 201 and the rich liquid delivery pipe 21.

[0061] The rich liquid output valve 51 provides an additional control means for the rich liquid to flow out of the absorption tower body 200. It can completely cut off the output of rich liquid when necessary, preventing the rich liquid from flowing out at inappropriate times, such as during system maintenance, repair, or abnormal situations. When the system needs to urgently stop or start the rich liquid output, the rich liquid output valve 51 can respond quickly to ensure the safe and stable operation of the system.

[0062] Furthermore, the second valve body 42, the third valve body 43, and the rich liquid output valve body 51 are respectively one of a shut-off valve and a cut-off valve.

[0063] Both gate valves and shut-off valves have good shut-off functions. Gate valves can effectively cut off the flow of fluid in the pipeline, and their good sealing performance can prevent leakage of rich liquid. Shut-off valves have the characteristic of rapid shut-off, and can quickly block the flow of rich liquid in a short time. The second valve body 42, the third valve body 43, and the rich liquid output valve body 51 can be selected as either gate valves or shut-off valves, and can be reasonably configured according to the specific requirements and operating conditions of the system.

[0064] The controller 32 can also communicate with the second valve body 42, the third valve body 43 and the rich liquid output valve body 51 as needed (when the second valve body 42, the third valve body 43 and the rich liquid output valve body 51 are remotely controllable valve bodies), without any restrictions.

[0065] Furthermore, detector 31 includes at least one of a densitometer, a refractometer, and a conductivity meter, but is not limited to these types (i.e., detector 31 can also be other suitable detection modules). Detector 31 is installed on the section of the rich liquid delivery pipe 21 between the rich liquid outlet 201 and the first valve group 11 to characterize the saturation state (carbon dioxide absorption state) of the rich liquid. The densitometer reflects the amount of carbon dioxide absorbed by measuring the density change of the rich liquid, because the density of the rich liquid changes after absorbing carbon dioxide. By accurately measuring the density, the carbon dioxide absorption state of the rich liquid can be determined relatively accurately. The refractometer determines its absorption state by utilizing the change in refractive index after the rich liquid absorbs carbon dioxide. Rich liquids with different absorption levels have different refractive indices, and the refractometer can sensitively capture these subtle changes, providing accurate signals to the controller 32. The conductivity meter characterizes the carbon dioxide absorption state by detecting the conductivity of the rich liquid. After the rich liquid absorbs carbon dioxide, its ion concentration changes, resulting in a change in conductivity, and the conductivity meter can monitor this change in real time.

[0066] Furthermore, the number of reflux ports 205 in this application can be varied according to actual needs. When the absorber tower body 200 is a packed tower, the number of reflux ports 205 is consistent with the number of packing sections in the packed tower. This design ensures that each packing section can be precisely controlled for reflux based on the carbon dioxide absorption state of the rich liquid. When the number of packing sections in the packed tower is large, more reflux ports 205 can achieve more detailed stratified reflux, allowing the absorbent to fully contact the carbon dioxide in packing sections at different heights, further improving absorption efficiency.

[0067] The following is an example provided in this application: four return ports 205 are designed, corresponding to four return pipes 22, realizing a four-layer return design. From top to bottom, they are the first return pipe 22, the second return pipe 22, the third return pipe 22, and the fourth return pipe 22, using this as an example:

[0068] When detector 31 detects that the absorption level is lower than the process requirement, detector 31 transmits a signal to controller 32, which then transmits a signal to the first valve group 11 to close it. At the same time, the signal is transmitted to the first valve group 11 on the first return pipe 22, the second return pipe 22, the third return pipe 22, and the fourth return pipe 22 to allocate the return position for different absorption levels (top, middle, and bottom priority).

[0069] When the absorption level is insufficient: prioritize the upper part (increase the valve opening of the second valve group 12 on the first return pipe 22 and the second return pipe 22; decrease / close the valve opening of the second valve group 12 on the third return pipe 22 and the fourth return pipe 22).

[0070] When the absorption level is moderate: the middle part takes priority (mainly using the valves of the second valve group 12 on the second return pipe 22 and the third return pipe 22; the valve group 12 on the first return pipe 22 and the fourth return pipe 22 participates moderately).

[0071] When the absorption level is sufficient: lower part takes priority (increase the valve opening of the second valve group 12 on the fourth return pipe 22; and decrease the valve opening of the second valve group 12 on the first to third return pipes 22).

[0072] When the absorption level is detected to meet the process requirements, the detector 31 transmits a signal to the controller 32, which then transmits a signal to the first valve group 11 to open, and simultaneously transmits a closing signal to the first valve group 11 on the first return pipe 22, the second return pipe 22, the third return pipe 22 and the fourth return pipe 22, thus completing the absorption process.

[0073] The controller 32 in this application can be a programmable logic controller (PLC). PLCs are characterized by high reliability and strong anti-interference capabilities, making them ideal for use in complex and harsh environments such as ships. It can stably receive signals from the detector 31 and quickly and accurately issue control commands to the first valve group 11, the second valve group 12, the third valve body 43, and the rich liquid output valve body 51, ensuring the stable operation of the entire ship's carbon capture system. Specific details are omitted here.

[0074] This application also discloses a carbon capture system, including a multi-point reflux absorption tower.

[0075] The gas source inlet 202 of the absorption tower body 200 of the multi-point reflux absorption tower passes through, for example... Figure 1 The gas supply pipe 61 shown is connected to the gas source to be captured (not shown in the figure); the gas supply pipe 61 and the gas source inlet 202 can be connected in series with the gas source inlet valve body 52.

[0076] The lean liquid inlet 203 of the absorber body 200 passes through, for example... Figure 1 The lean liquid delivery pipe 62 shown is connected to the lean liquid tank (not shown in the figure); a lean liquid delivery valve body 53 can be connected in series between the lean liquid delivery pipe 62 and the lean liquid inlet 203.

[0077] The other end of the rich liquid delivery pipe 21 of the multi-point reflux absorption tower is connected to the regeneration unit (not shown in the figure) or the rich liquid tank (not shown in the figure).

[0078] The clean gas vent 204 on the absorption tower body 200 is connected to a clean gas vent pipe 63, and a clean gas valve body 54 is connected in series between the clean gas vent pipe 63 and the clean gas vent 204.

[0079] The main structure of the absorption tower body 200 in this application is based on the existing absorption tower structure design. Therefore, the distribution positions of the lean liquid inlet 203, rich liquid outlet 201, clean gas exhaust outlet 204, and gas source inlet 202 can all be referenced or adopted from the existing distribution positions, and will not be described in detail.

[0080] The gas source input valve body 52, the lean liquid delivery valve body 53, and the clean gas valve body 54 can be either a shut-off valve or a cut-off valve.

[0081] Taking the application of a multi-point reflux absorption tower in shipboard carbon capture as an example, the gas source to be captured mentioned above specifically refers to the ship's exhaust gas source. Of course, the multi-point reflux absorption tower designed in this application is not limited to shipboard carbon capture scenarios, but can also be applied to other carbon capture scenarios such as land-based carbon capture. Correspondingly, the gas source to be captured can be industrial process gas source, combustion flue gas source, biomass gas source, etc., without limitation.

[0082] The above provides a detailed description of a multi-point reflux absorption tower and carbon capture system provided in this application. For those skilled in the art, based on the ideas of the embodiments of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A multi-point reflux absorption tower, characterized in that, Includes the absorption tower body (200) and the reflux assembly (100); The absorption tower body (200) has multiple reflux ports (205) above its rich liquid outlet (201). The plurality of reflux ports (205) are arranged sequentially at intervals along the axial direction of the absorption tower body (200); The reflux assembly (100) includes a rich liquid delivery pipe (21), a detector (31), a controller (32), and multiple reflux pipes (22). One end of the rich liquid delivery pipe (21) is connected to the rich liquid outlet (201). The rich liquid delivery pipe (21) is equipped with a first valve group (11). One end of each of the reflux pipes (22) is connected to a corresponding reflux port (205); Each of the aforementioned return pipes (22) is equipped with a second valve assembly (12); The other end of each return pipe (22) is connected together to the pipe section on the rich liquid delivery pipe (21) between the rich liquid outlet (201) and the first valve group (11); Pump units (44) are installed on the rich liquid delivery pipe (21) and / or each of the return pipes (22) to provide return power; The detector (31) is used to detect the carbon dioxide absorption status of the rich liquid in the pipe section between the rich liquid outlet (201) and the first valve group (11) on the rich liquid delivery pipe (21). The controller (32) is communicatively connected to the pump group (44), the first valve group (11), the second valve group (12) and the detector (31).

2. The multi-point reflux absorption tower according to claim 1, characterized in that, Both the first valve group (11) and the second valve group (12) include an adjustable first valve body (41). The controller (32) is communicatively connected to the first valve body (41).

3. The multi-point reflux absorption tower according to claim 2, characterized in that, The first valve body (41) is a regulating valve.

4. The multi-point reflux absorption tower according to claim 2, characterized in that, The first valve group (11) and the second valve group (12) each include a second valve body (42). The second valve body (42) is connected in series on at least one side of the first valve body (41).

5. The multi-point reflux absorption tower according to claim 4, characterized in that, The first valve group (11) and the second valve group (12) also each include a third valve body (43); The third valve body (43) is connected in parallel with the first valve body (41).

6. The multi-point reflux absorption tower according to claim 5, characterized in that, A rich liquid output valve body (51) is connected in series between the rich liquid output port (201) and the rich liquid delivery pipe (21).

7. The multi-point reflux absorption tower according to claim 6, characterized in that, The second valve body (42), the third valve body (43), and the rich liquid output valve body (51) are respectively a shut-off valve and a cut-off valve.

8. The multi-point reflux absorption tower according to claim 1, characterized in that, The detector (31) includes at least one of a densitometer, a refractometer and a conductivity meter, but is not limited to these types.

9. The multi-point reflux absorption tower according to claim 1, characterized in that, When the absorption tower body (200) is a packed tower, the number of reflux ports (205) is consistent with the number of packing sections of the packed tower.

10. A carbon capture system, characterized in that, Including the multi-point reflux absorption tower as described in any one of claims 1 to 9; The gas source inlet (202) of the absorption tower body (200) of the multi-point reflux absorption tower is connected to the gas source to be captured through the gas source delivery pipe (61); The lean liquid inlet (203) of the absorption tower body (200) is connected to the lean liquid tank through the lean liquid delivery pipe (62); The other end of the rich liquid delivery pipe (21) of the multi-point reflux absorption tower is connected to the regeneration device or the rich liquid tank.

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