Device for absorbing carbon dioxide and use thereof

Abstract

The application relates to the technical field of carbon capture, and discloses a device for absorbing carbon dioxide and application thereof. The device is characterized in that the device comprises a reaction absorption tower (4), a flue gas conveying pipeline (5), a circulating pipeline (8) and a micro-channel device (10); wherein the reaction absorption tower (4) is provided with a partition plate (9), and the partition plate divides the reaction absorption tower into a reaction cavity (2) and a circulating cavity (15); wherein the reaction absorption tower (4) is provided with a disperser (3); wherein the micro-channel device (10) is provided with a sudden expansion device (16). The device can be used for absorbing carbon dioxide, and can improve the carbon dioxide removal rate.

Description

Technical Field

[0001] This invention relates to the field of carbon capture technology, specifically to a device for absorbing carbon dioxide and its application. Background Technology

[0002] As human demand for energy increases, large amounts of carbon dioxide are emitted into the atmosphere, disrupting the balance of Earth's climate and ecosystems. Globally, reducing emissions of greenhouse gases such as CO2 and preventing global warming has become an increasingly important strategic issue. For the foreseeable future, fossil fuels will remain the primary source of energy for humanity, making the situation regarding carbon dioxide emission reduction extremely challenging.

[0003] The main ways to reduce carbon dioxide emissions include improving energy efficiency, adjusting the energy structure, and carbon dioxide capture, utilization, and storage (CCUS). Among these, CCUS, as the most direct means of reducing carbon dioxide emissions, is not only most suitable for end-of-pipe retrofitting of existing carbon dioxide emission control devices, but also a major approach to addressing the carbon emissions from industries such as cement, steel, and chemicals, which are difficult to resolve through renewable energy sources.

[0004] Currently, CO2 separation technologies mainly include absorption, adsorption, membrane separation, and cryogenic separation. Absorption is currently the most mature and widely used CO2 separation technology. Chemical absorption processes, represented by ethanolamine (MEA), can recover high-purity CO2 with relatively low investment. The operation of the amine solution absorption method involves passing gas containing carbon dioxide through the bottom of the absorption tower, while the absorbent is added from the top, forming a liquid film on the surface of the packing material inside the tower. The gas comes into contact with the liquid film on the packing material, where the carbon dioxide dissolves into the liquid film, thus removing the carbon dioxide.

[0005] CN202211174120.4 discloses a microdroplet-enhanced carbon dioxide absorption device, comprising: a reaction vessel and a microdroplet atomizing assembly; the microdroplet atomizing assembly includes an atomizer and a controller, the nozzle of the atomizer extending into the interior of the reaction vessel; the reaction vessel is connected to a catalyst delivery pipeline and a carbon dioxide delivery pipeline; a circulation pipeline is provided on the outside of the reaction vessel, the inlet of the circulation pipeline is connected to the bottom of the reaction vessel, and the outlet is connected to the inlet of the atomizer, the liquid circulating in the circulation pipeline is dispersed and broken into microdroplets by the atomizer and then enters the reaction vessel.

[0006] CN202210560391.7 discloses a carbon dioxide enhanced reaction device and reaction method, including a reaction absorption tower. A circulation pipe is provided on one side of the reaction absorption tower, and the inlet and outlet of the circulation pipe are connected to the side wall of the reaction absorption tower. A liquid inlet and a gas inlet are provided on the wall of the circulation pipe. A micro-interface unit is provided inside the circulation pipe. A liquid phase containing CO2 absorption and / or reacting with CO2 enters the circulation pipe through the liquid inlet, and a gas containing CO2 enters the micro-interface unit through the gas inlet, where it is dispersed and broken into micron-sized microbubbles.

[0007] CN201310578461.2 discloses a method for enhancing carbon dioxide absorption using an ionic liquid emulsion membrane. This method prepares a water-in-oil-in-water emulsion membrane dispersion system containing an ionic liquid. The absorption rate of carbon dioxide by the absorbent is enhanced by dispersing oil droplets. Simultaneously, the ionic liquid in the oil film, which has high solubility for carbon dioxide, accelerates the mass transfer of carbon dioxide into the inner aqueous phase containing calcium hydroxide. This allows carbon dioxide and calcium hydroxide to react and form calcium carbonate. Due to the limitation imposed by the size of the droplets in the inner aqueous phase, fine calcium carbonate particles are prepared under conditions where the inner aqueous phase space serves as a soft template.

[0008] The advantage of traditional packing methods is that they can handle a large amount of carbon dioxide, but they also have problems such as high energy consumption, small contact area between the liquid film on the packing surface and the gas, low absorption efficiency, and large amount of absorbent.

[0009] Therefore, there is a need for a device that increases the interphase contact area, enhances heat and mass transfer, improves carbon dioxide absorption efficiency, and reduces energy consumption. Summary of the Invention

[0010] The purpose of this invention is to overcome the problems of low raw material conversion rate and reaction efficiency, and low carbon dioxide removal rate in the existing technology, and to provide a device for absorbing carbon dioxide and its application.

[0011] To achieve the above objectives, the first aspect of the present invention provides a device for absorbing carbon dioxide, characterized in that the device comprises: a reaction absorption tower 4, a flue gas conveying pipeline 5, a circulation pipeline 8, and a microchannel device 10;

[0012] The reaction absorption tower 4 is equipped with a partition 9, which divides the reaction absorption tower into a reaction chamber 2 and a circulation chamber 15.

[0013] The reaction absorption tower 4 is equipped with a disperser 3.

[0014] The microchannel device 10 is provided with a burst diffuser 16.

[0015] A second aspect of the present invention provides an application of the apparatus described in the first aspect of the present invention in the absorption of carbon dioxide.

[0016] The beneficial effects of the present invention through the above technical solution are as follows:

[0017] (1) The device for absorbing carbon dioxide described in this invention is equipped with a microchannel device to break the gas into micron-sized bubbles. A diffuser is installed at the outlet of the microchannel so that the microbubbles generated when the gas and liquid collide can be ejected from the outlet instantly without accumulating, thus ensuring the dispersion effect and increasing the gas-liquid contact area.

[0018] (2) In the carbon dioxide absorption device of the present invention, a disperser is provided on the wall of the absorption tower, which can instantly disperse the generated microbubbles into the liquid absorbent, ensuring the dispersion effect and preventing the generated bubbles from directly impacting the wall of the absorption tower and causing bubble aggregation. The microbubbles increase the mass transfer contact area between the gas and liquid phases by tens of times, improve the raw material conversion rate and reaction efficiency, and enhance the absorption of carbon dioxide.

[0019] (3) In the carbon dioxide absorption device of the present invention, a baffle is set in the reaction absorption tower to divide the absorption tower into a reaction chamber and a circulation chamber, thereby extending the reaction time, ensuring the full reaction of carbon dioxide in the flue gas, and improving the carbon dioxide removal rate. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a method for enhancing carbon dioxide absorption in flue gas according to Embodiment 1 of the present invention;

[0021] Figure 2 This is a schematic diagram of the microchannel device provided in Embodiment 1 of the present invention;

[0022] Figure 3 This is a schematic diagram of the structure of the microchannel device provided in Embodiment 2 of the present invention.

[0023] Explanation of reference numerals in the attached figures

[0024] 1-Exhaust gas outlet; 2-Reaction chamber; 3-Disperser; 4-Reaction absorption tower; 5-Flue gas conveying pipeline; 6-Exhaust port; 7-Liquid sprayer; 8-Circulation pipeline; 9-Baffle; 10-Microchannel device; 11-Liquid inlet; 12-Heat exchanger; 13-Liquid outlet; 14-Circulation pump; 15-Circulation chamber; 16-Diffuser; 17-Microchannel gas phase inlet; 18-Microchannel liquid phase inlet; 19-Gas phase interface connected to microchannel; 20-Filter; 21-Liquid phase interface connected to microchannel. Detailed Implementation

[0025] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0026] The first aspect of the present invention provides an apparatus for absorbing carbon dioxide, wherein, as Figure 1 As shown, the device includes: a reaction absorption tower 4, a flue gas conveying pipeline 5, a circulation pipeline 8, and a microchannel device 10;

[0027] The reaction absorption tower 4 is equipped with a partition 9, which divides the reaction absorption tower into a reaction chamber 2 and a circulation chamber 15.

[0028] The reaction absorption tower 4 is equipped with a disperser 3.

[0029] The microchannel device 10 is provided with a burst diffuser 16.

[0030] In some embodiments of the present invention, preferably, the reaction absorption tower is connected to a flue gas conveying pipeline; a circulation pipeline is provided on the outside of the reaction absorption tower; the inlet of the circulation pipeline is connected to the bottom of the reaction absorption tower, and the outlet is connected to the microchannel device, the top of the reaction absorption tower, and the lean and rich liquid inlet and outlet pipelines. Liquid containing carbon dioxide absorbs enters the circulation pipeline, and flue gas containing carbon dioxide is sheared into microbubbles in the microchannel device, released through a burst diffuser, and then absorbed in the reaction absorption tower.

[0031] In some embodiments of the present invention, preferably, the material in the reaction chamber enters the circulation chamber after the reaction, and the liquid in the circulation chamber enters the circulation pipe.

[0032] In some embodiments of the present invention, preferably, the microchannel device 10 is disposed inside the reaction chamber 2 of the reaction absorption tower. The microchannel gas-phase tube and microchannel liquid-phase tube disposed within the microchannel device are of variable diameter, with their diameters decreasing at the gas inlet 17 and liquid inlet 18, and the microchannel gas-phase tube and microchannel liquid-phase tube being connected together and then connected to the diffuser 16; that is, the inner diameter of the microchannel gas-phase tube and microchannel liquid-phase tube is smaller at the end closer to the diffuser 16 (i.e., at the gas inlet 17 and liquid inlet 18), and larger at the end farther from the diffuser 16. This variable diameter configuration can increase the flow velocity of the gas flowing in the microchannel gas-phase tube and the liquid flowing in the microchannel liquid-phase tube at the gas inlet 17 and liquid inlet 18, respectively, and then converge and flow out from the bubble outlet of the microchannel device 10 to the diffuser 16. This allows the converged gas and liquid to generate more bubbles through the diffuser 16 and enter the reaction chamber 2, resulting in better dispersion of the carbon dioxide-containing gas in the reaction chamber, which is beneficial for improving the absorption rate of carbon dioxide in the gas.

[0033] In some embodiments of the present invention, preferably, the flue gas conveying pipe 5 extends from the lower part of the reaction absorption tower 4 and is connected to the microchannel device 10.

[0034] In some embodiments of the present invention, preferably, the microchannel device 10 is disposed in the reaction chamber 2 to shear the carbon dioxide-containing flue gas from the flue gas conveying pipe 5 into microbubbles, which then enter the circulation pipe 8.

[0035] In some embodiments of the present invention, preferably, the diffuser 16 is disposed at the bubble outlet of the microchannel device 10;

[0036] Preferably, the opening angle of the diffuser 16 is 120°-150°. This allows the microbubbles generated when the gas and liquid collide to be ejected instantly from the outlet without accumulating, ensuring dispersion and increasing the gas-liquid contact area.

[0037] In some embodiments of the present invention, preferably, the disperser 3 is disposed on the wall of the reaction absorption tower 4 and is opposite to the bubble outlet of the microchannel device 10; the disperser can disperse microbubbles into the liquid phase in a timely manner, preventing the generated bubbles from directly impacting the wall of the absorption tower and causing bubble aggregation.

[0038] In some embodiments of the present invention, preferably, the circulation pipe 8 is disposed on the outside of the reaction absorption tower 4, for connecting the circulation chamber 15 at the lower part of the reaction absorption tower 4 and the microchannel device 10 at the middle part of the reaction absorption tower 4, extending into the upper part of the reaction absorption tower 4 above the reaction chamber 2, and the circulation pipe 8 is also connected to the liquid phase inlet 11 of the microchannel device 10.

[0039] In some embodiments of the present invention, preferably, the circulation pipe 8 is provided with a liquid sprayer 7 located above the reaction chamber 2. By installing the liquid sprayer, it is beneficial to spray the liquid in the circulation pipe entering the absorption tower more evenly, so as to perform secondary absorption on the unabsorbed gas and enhance the absorption effect.

[0040] In some embodiments of the present invention, preferably, a heat exchanger 12 and a circulation pump 14 are provided on the circulation pipe 8; the heat exchanger 12 can remove the heat generated during the gas-liquid reaction in a timely manner, and further reduce the liquid temperature; more preferably, the circulation pump 14 is located at the bottom of the inlet section of the circulation pipe.

[0041] In some embodiments of the present invention, preferably, the microchannel device 10 further includes a microchannel gas phase tube and a microchannel liquid phase tube arranged perpendicularly to each other. The gas phase interface 19 of the microchannel gas phase tube is connected to the flue gas delivery pipe 5, and the liquid phase interface 21 of the microchannel liquid phase tube is connected to the circulation pipe 8. The gas phase inlet 17 of the microchannel gas phase tube and the liquid phase inlet 18 of the microchannel liquid phase tube intersect and are connected to the diffuser 16. The gas phase interface 19 of the microchannel gas phase tube is also provided with a filter 20. The gas in the gas pipeline enters the microchannel device 10 after being filtered by the gas filter 20, preventing impurities in the gas from clogging the channel. The gas phase inlet 17 and the liquid phase inlet 18 are both positioned relative to the circulation chamber 15 for the entry of gas or liquid.

[0042] In some embodiments of the present invention, preferably, the microchannel gas phase tube is coaxially arranged with the diffuser 16, such as... Figure 2 As shown, the two liquid streams shear the gas, resulting in a higher frequency of bubble generation, easier control over bubble size, and a higher throughput; or, as... Figure 3 As shown, the microchannel liquid phase tube is coaxially arranged with the diffuser 16.

[0043] In some embodiments of the present invention, preferably, the liquid in the circulation pipe 8 is an alkaline solution capable of absorbing carbon dioxide, such as an absorbent for carbon dioxide capture, like MA solvent produced by Sinopec Nanjing Chemical Research Institute.

[0044] In some embodiments of the present invention, preferably, a jacket, i.e., heat insulation cotton, is provided outside the reaction absorption tower 4 to prevent heat loss.

[0045] In some embodiments of the present invention, preferably, the reaction absorption tower 4 is provided with a tail gas outlet 1 at the top and an air vent 6 at the bottom.

[0046] A second aspect of the present invention provides an application of the apparatus described in the first aspect of the present invention in the absorption of carbon dioxide.

[0047] Combination Figures 1-3 The process of absorbing carbon dioxide in the device of the present invention is as follows:

[0048] (1) Gas containing carbon dioxide enters the microchannel device 10 through the flue gas conveying pipe 5; alkaline liquid (lean liquid) that can absorb carbon dioxide enters the circulation pipe 8 through the liquid inlet 11, part of which enters the microchannel device 10 and part of which is sprayed down from the liquid sprayer 7 at the top of the absorption tower 4.

[0049] (2) After the gas and liquid in the microchannel device 10 converge, they enter and disperse in the reaction chamber 2 through the diffuser 16 and the disperser 3. The gas is absorbed by the lean liquid in the reaction chamber 2 to form a rich liquid.

[0050] (3) The rich liquid returns from the liquid outlet 13 to the circulation pipeline 8 through the circulation chamber 15 and then goes to the desorption tower.

[0051] The present invention will be described in detail below through embodiments. In this invention, it should be noted that the terms "connection," "linking," and "installation" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable 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. The specific meaning of the above terms in this invention can be understood according to the actual situation.

[0052] In this invention, the liquid that has not yet absorbed carbon dioxide is called the lean liquid, and the liquid that has absorbed carbon dioxide is called the rich liquid.

[0053] In the following examples, the carbon dioxide content in the gas was measured using a flue gas analyzer; the raw material MA solvent was a product manufactured by Sinopec Nanjing Chemical Research Institute.

[0054] Example 1

[0055] This embodiment provides a device for enhancing the absorption of carbon dioxide in flue gas, such as... Figure 1 As shown, it includes: a reaction absorption tower 4, which is equipped with a circulation pipe 8. The inlet and outlet of the circulation pipe 8 are connected to the lower, middle and upper parts of the reaction absorption tower 4, respectively; a microchannel device 10 is connected to a liquid inlet 11 and a flue gas conveying pipe 5; the lean liquid enters the circulation pipe 8 through the liquid inlet 11, part of which enters the microchannel device 10 and part of which is sprayed down from the liquid sprayer 7 at the top of the absorption tower 4; the rich liquid goes to the desorption tower through the liquid outlet 13.

[0056] In the microchannel device 10, gas is filtered by gas filter 20 and enters through gas inlet 17 of microchannel gas phase tube. Liquid enters the microchannel device 10 through liquid inlet 18 of microchannel liquid phase tube. At the bubble outlet of microchannel device 10 (wherein, near the bubble outlet, the diameter of gas inlet 17 and liquid inlet 18 is smaller than that of microchannel gas phase tube and microchannel liquid phase tube respectively, to increase the flow rate of gas and liquid contact), gas and liquid come into contact. The gas is dispersed into uniform microbubbles by the shear force between the gas and liquid phases, and then enters reaction chamber 2 through diffuser 16.

[0057] The reaction absorption tower 4 is equipped with a vertical baffle 9, which divides the reaction absorption tower 4 into a reaction chamber 2 and a circulation chamber 15. The material in the reaction chamber 2 overflows from the top of the baffle 9 into the circulation chamber 15. The inlet of the circulation pipe 8 is connected to the circulation chamber 15, so that the material in the reaction chamber 2 can enter the circulation pipe 8 through the circulation chamber 15.

[0058] Specifically, the gas is first absorbed in the reaction chamber 2. When the liquid in the reaction chamber 2 reaches a certain height, the liquid overflows from the upper part of the partition into the circulation chamber 15. The liquid in the circulation chamber 15 then enters the circulation pipe 8 for recycling. The purpose of recycling is to extend the reaction time, improve the solvent utilization rate, save the amount of solvent used, reduce energy consumption, and maximize the role of the solvent.

[0059] like Figure 2 As shown, the microchannel device 10 adopts a cross-shaped structure, which is relatively more stable. The microchannel gas phase tube and the diffuser 16 are coaxially arranged, and the two liquids shear the gas, resulting in a higher bubble generation frequency, easier control of bubble size, and higher throughput. The microchannel device 10 is installed vertically to avoid the liquid in the absorption tower 4 from putting pressure on the bubble outlet, which is conducive to the timely ejection of bubbles.

[0060] In this embodiment, a diffuser 16 is installed at the bubble outlet, allowing the generated bubbles to be ejected instantly without aggregation, ensuring dispersion and improving reaction efficiency. The outlet direction of the microchannel device 10 is perpendicular to the flow direction of the liquid in the circulation pipe 8.

[0061] In this embodiment, a disperser 3 is installed at the position of the absorption tower 4 opposite to the bubble outlet. The disperser can disperse the bubbles coming out of the diffuser 16 in a timely manner, preventing the bubbles from directly impacting the wall of the absorption tower 4. This avoids the problem of the bubbles agglomerating when impacting the wall, which would lead to a decrease in absorption efficiency. It also increases the gas-liquid mass transfer contact area and enhances the absorption effect.

[0062] In this embodiment, the outlet of the circulation pipe 8 is connected to the microchannel device 10 and the top of the absorption tower 4. The top of the absorption tower 4 is connected to the liquid sprayer 7. The liquid is sprayed from top to bottom, which can perform secondary absorption of some of the unabsorbed gas and improve the absorption efficiency of the liquid.

[0063] In this embodiment, the liquid in the liquid pipeline is an alkaline liquid that can absorb carbon dioxide, specifically MA solvent produced by Sinopec Nanjing Chemical Research Institute. Of course, other types of absorbents can also be used. This invention does not impose specific limitations, as long as it can achieve the effect of absorbing carbon dioxide.

[0064] In this embodiment, a circulation pump 14 is installed on the circulation pipe 8, and a heat exchanger 12 is provided on the circulation pipe 8.

[0065] To prevent the microchannel device 10 from becoming clogged, a filter 20 is installed inside the microchannel gas phase tube. Gas from the flue gas delivery pipe 5 is filtered by the filter 20 before entering the gas phase inlet 17.

[0066] In this embodiment, the top of the reaction absorption tower 4 is provided with a tail gas outlet 1, and the bottom is provided with an air vent 6.

[0067] Example 2

[0068] The only difference between this embodiment and Embodiment 1 is that the microchannel device in this example uses a "T"-shaped structure. For example... Figure 3 As shown in this embodiment, in the "T"-shaped structure of the microchannel device, the gas channel and the liquid channel are perpendicular to each other, the microchannel liquid phase tube is coaxially arranged with the diffuser 16, and the width of both the gas and liquid channels is variable.

[0069] Comparative Example 1

[0070] The only difference between this example and Example 1 is that the expander 16 is not provided in this example.

[0071] Comparative Example 2

[0072] The only difference between this example and Example 1 is that the disperser 3 is not provided in this example.

[0073] Comparative Example 3

[0074] The difference between this example and Example 2 is that the widths of the microchannel gas phase tube and the microchannel liquid phase tube are uniform and do not change in diameter.

[0075] Carbon dioxide absorption efficiency test

[0076] Carbon dioxide in flue gas was absorbed using the reaction systems of Examples 1-2 and Comparative Examples 1-3, respectively. The absorbent was MA solvent, and the CO2 content in the flue gas was 13.5 wt%. The CO2 content at the tail gas outlet was measured, and the results are shown in Table 1.

[0077] Table 1

[0078]

[0079] As can be seen from the table above, the reaction system of the present invention can effectively reduce the carbon dioxide content in flue gas. Among them, the "+" shaped microchannel device 10 in Example 1 has the best absorption effect on carbon dioxide.

[0080] Comparing Example 1 with Comparative Example 1, it can be seen that the absorption effect of Example 1 is far superior to that of Comparative Example 1. This is because in the reaction system of Example 1, a diffuser 16 is provided at the gas bubble outlet of the microchannel. The diffuser 16 can instantly eject the bubbles generated by the microchannel, preventing them from accumulating at the gas outlet. The gas can enter the liquid in the form of bubbles, increasing the gas-liquid phase interface contact area by tens of times, resulting in higher reaction efficiency.

[0081] Comparing Example 1 with Comparative Example 2, it can be seen that the carbon dioxide absorption effect of Example 1 is significantly better than that of Comparative Example 2. This is because Example 1 has a bubble disperser 3 installed at the position of the absorption tower opposite to the bubble outlet. The disperser 3 can disperse the bubbles coming out of the diffuser 16 in time, preventing the bubbles from directly impacting the wall of the absorption tower 4. This avoids the problem of the bubbles agglomerating when impacting the wall, which would lead to a decrease in absorption efficiency. It also increases the gas-liquid mass transfer contact area and enhances the absorption effect.

[0082] Comparing Example 2 with Comparative Example 3, it can be seen that the carbon dioxide absorption rate of Example 2 is better than that of Comparative Example 3. In Comparative Example 3, the widths of the gas channel and the liquid channel are uniform and there is no change in diameter, and the number of bubbles generated is less than that of Example 2.

[0083] Compared with existing reaction systems, the enhanced carbon dioxide absorption method of the present invention has a simple overall system structure and can significantly improve the carbon dioxide absorption rate.

[0084] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A device for absorbing carbon dioxide, characterized in that, The device includes: a reaction absorption tower (4), a flue gas conveying pipeline (5), a circulation pipeline (8), and a microchannel device (10). The reaction absorption tower (4) is equipped with a partition (9), which divides the reaction absorption tower into a reaction chamber (2) and a circulation chamber (15). The reaction absorption tower (4) is equipped with a disperser (3). The microchannel device (10) is provided with a burst diffuser (16). The flue gas conveying pipe (5) extends from the lower part of the reaction absorption tower (4) and is connected to the microchannel device (10). The microchannel device (10) is disposed in the reaction chamber (2) and is used to shear the carbon dioxide-containing flue gas from the flue gas conveying pipe (5) into microbubbles and then enter the circulation pipe (8). The diffuser (16) is located at the bubble outlet of the microchannel device (10); the disperser (3) is located on the wall of the reaction absorption tower (4) and is opposite to the bubble outlet of the microchannel device (10).

2. The apparatus according to claim 1, wherein, The opening angle of the diffuser (16) is 120°-150°.

3. The apparatus according to claim 1 or 2, wherein, The circulation pipe (8) is located on the outside of the reaction absorption tower (4) and is used to connect the circulation chamber (15) at the lower part of the reaction absorption tower (4) and the microchannel device (10) at the middle part of the reaction absorption tower (4). It extends into the upper part of the reaction absorption tower (4) to the upper part of the reaction chamber (2). At the same time, the circulation pipe (8) is also connected to the liquid phase inlet (11) of the microchannel device (10).

4. The apparatus according to claim 3, wherein, The circulation pipe (8) is equipped with a liquid sprayer (7) located above the reaction chamber (2).

5. The apparatus according to claim 1 or 2, wherein, A heat exchanger (12) and a circulation pump (14) are installed on the circulation pipe (8).

6. The apparatus according to claim 1 or 2, wherein, The microchannel device (10) further includes a microchannel gas phase tube and a microchannel liquid phase tube arranged perpendicularly to each other. The gas phase interface (19) of the microchannel gas phase tube is connected to the flue gas conveying pipe (5), the liquid phase interface (21) of the microchannel liquid phase tube is connected to the circulation pipe (8), and the gas phase inlet (17) of the microchannel gas phase tube and the liquid phase inlet (18) of the microchannel liquid phase tube intersect and are connected to the diffuser (16). The gas phase interface (19) of the microchannel gas phase tube is also provided with a filter (20).

7. The apparatus according to claim 6, wherein, The microchannel gas phase tube is coaxially arranged with the diffuser (16), or the microchannel liquid phase tube is coaxially arranged with the diffuser (16).

8. The use of the apparatus according to any one of claims 1-7 in the absorption of carbon dioxide.

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