Composite absorption column and carbon dioxide capture system

Abstract

The embodiment of the present application provides a composite absorption tower and a carbon dioxide capture system. The composite absorption tower comprises a tower body, a filler support, a cooling assembly, a plurality of filler blocks and a liquid collecting tank. The tower body has a cavity, the tower body is provided with an air inlet and an air outlet, the filler support is arranged in the cavity, and the filler support and the tower body define a reaction chamber; the cooling assembly is arranged in the reaction chamber in a longitudinal and transverse staggered manner and is separated into a plurality of filler sub-chambers with the tower body, the plurality of filler blocks are correspondingly arranged in the filler sub-chambers, and the cooling assembly circulates refrigerant; and the liquid collecting tank is arranged below the reaction chamber to collect absorption liquid. Therefore, the absorption liquid changes from indirect heat exchange to direct contact heat exchange, so that the absorption liquid is kept at a relatively low temperature. Therefore, the composite absorption tower according to the embodiment of the present application has the advantages of reducing energy consumption, improving heat exchange efficiency and reducing equipment investment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of carbon dioxide recovery, in particular to a composite absorption tower and a carbon dioxide capture system with the same. BACKGROUND

[0002] At present, CO2 capture technology can be divided into pre-combustion capture, oxy-combustion capture and post-combustion capture, wherein the post-combustion capture includes chemical absorption method, physical absorption method, membrane separation method and low-temperature distillation method, etc., and the chemical absorption method is the most effective CO2 capture technology at present and is often used in post-combustion CO2 capture, that is, through chemical reaction of CO2 in flue gas with absorption liquid, CO2 is absorbed, and then through heating of the absorption liquid, CO2 is released. The CCUS system, the middle two layers of the composite absorption tower are absorption sections, and in the process of capturing carbon dioxide, the absorption liquid needs to be kept at an appropriate temperature of 40℃, and then the absorption liquid capturing process is an exothermic reaction. After heating, the absorption capacity of the absorption liquid will be reduced.

[0003] In the related art, the absorption tower includes an absorption tower body and a guide layer, a filler layer, a spraying layer and a cooling circulation system arranged in the absorption tower body from bottom to top, and the absorption liquid needs to be guided out to the cooling circulation system for cooling. This kind of way has the problems of high energy consumption and low heat exchange efficiency. SUMMARY

[0004] The present application aims to at least solve one of the technical problems in the related art. To this end, an embodiment of the present application proposes a composite absorption tower. The composite absorption tower has the advantages of reducing energy consumption and improving heat exchange efficiency.

[0005] An embodiment of the present application also proposes a carbon dioxide capture system.

[0006] The composite absorption tower of the embodiment of the present application includes a tower body, a filler support, a cooling assembly, a plurality of filler blocks and a liquid collecting tank.

[0007] The tower body has a cavity, the tower body is provided with an air inlet and an air outlet, the filler support is arranged in the cavity, and the filler support and the tower body define a reaction chamber; the cooling assembly is arranged in the reaction chamber in a longitudinal and transverse staggered manner and is separated into a plurality of filler sub-chambers with the tower body, a plurality of filler blocks are correspondingly arranged in the filler sub-chambers, and the cooling assembly circulates refrigerant therein; and the liquid collecting tank is arranged below the reaction chamber to collect absorption liquid.

[0008] The composite absorption tower of the embodiment of the present application has the advantages of reducing energy consumption, improving heat exchange efficiency and reducing equipment investment.

[0009] Thus, the composite absorption tower of the embodiment of the present application has the advantages of reducing energy consumption, improving heat exchange efficiency and reducing equipment investment.

[0010] In some embodiments, the tower body is spaced apart by a plurality of reaction chambers along the height direction thereof, each of the reaction chambers is uniformly provided with the cooling assembly, the collecting tank is provided with at least one, the exhaust port is located above the most upstream reaction chamber, the gas inlet is located below the most downstream reaction chamber, each of the reaction chambers has a liquid inlet, the collecting tank has a liquid outlet, the liquid outlet of the reaction chamber at the upper stage is communicated with the liquid inlet of the reaction chamber at the lower stage adjacent thereto.

[0011] In some embodiments, the cooling assembly comprises a heat exchanger, a busbar, a plurality of main pipes and a plurality of branch pipes, the heat exchanger is communicated with the plurality of main pipes through the busbar, each of the branch pipes is communicated with the main pipe, each of the main pipes extends along the extension direction of the filler support, each of the branch pipes extends along the height direction of the tower body to define the filler sub-chamber, and the plurality of branch pipes define the filler sub-chamber together with the filler support and / or the tower body.

[0012] In some embodiments, the filler support comprises an upper cross beam, a lower cross beam and a connecting beam arranged below the reaction chamber, the upper cross beam is connected with the lower cross beam through the connecting beam, at least part of the plurality of main pipes extends along the extension direction of the upper cross beam, the main pipe is fitted with the side wall surface of the upper cross beam, and the upper end surface of the main pipe is lower than or flush with the upper end surface of the upper cross beam.

[0013] In some embodiments, the composite absorption tower further comprises a plurality of distributors, each of the distributors is arranged above one of the reaction chambers, and each of the distributors is arranged above the packing blocks of the reaction chamber corresponding to the distributor, each of the distributors comprises a liquid inlet, a liquid outlet and a plurality of atomizing nozzles, the liquid inlet is in communication with the distributor, the atomizing nozzles are evenly distributed on the distributor, the liquid outlet is in communication with the reaction chamber, and the liquid outlet is arranged adjacent to the packing support.

[0014] In some embodiments, the composite absorption tower further comprises a grid pressing plate, which is arranged on the packing blocks to prevent the packing from floating up.

[0015] In some embodiments, the composite absorption tower further comprises a liquid return buffer tank and a plurality of liquid discharge pipes, the liquid return buffer tank is arranged at the top of the tower body, the liquid return buffer tank has a liquid return cavity, the tower body has a liquid return port in communication with the liquid return cavity, the liquid return cavity is arranged above the distributor above the most upstream reaction chamber, and the liquid discharge pipes extend horizontally and extend between the distributor and the liquid return buffer tank.

[0016] In some embodiments, the composite absorption tower further comprises an upper cover plate, and the cooling assembly further comprises a cooling bypass in communication with the heat exchanger corresponding to the most upstream reaction chamber, the upper cover plate is arranged between the liquid return buffer tank and the distributor corresponding to the most upstream reaction chamber, the upper cover plate has a plurality of air permeable holes, and the cooling bypass is arranged on the upper cover plate.

[0017] In some embodiments, the upper cover plate comprises a cover plate body and a mesh layer, the cover plate body has a dome-shaped top, the cooling bypass is arranged between the mesh layer and the cover plate body, and the cover plate body has a plurality of air permeable holes.

[0018] In some embodiments, the outer edge of the liquid collecting tank is connected to the inner wall of the tower body, the liquid collecting tank has a plurality of smoke passing holes arranged at intervals, the inner wall of each smoke passing hole extends upward adjacent to the packing support to form a smoke passing channel, and the smoke passing channel, the liquid collecting tank and the tower body define a liquid storage cavity.

[0019] In some embodiments, the composite absorption tower further comprises a flow guide, which comprises a first connecting plate, a flow guide plate, a second connecting plate and a flow guide baffle connected in sequence, the first connecting plate is connected with the upper end of the smoke channel, the flow guide plate is an upper convex cone plate, the top of the flow guide plate is provided with a smoke exhaust hole, the lower end of the upper convex cone plate is connected with the second connecting plate, a flow guide cavity is formed between the second connecting plate and the upper convex cone plate, the second connecting plate is provided with a flow guide hole for the discharge of absorption liquid, the flow guide baffle is a lower convex cone plate, the lower convex cone plate is connected between two adjacent smoke channels, and the orthographic projection of the lower convex cone plate partially overlaps the orthographic projection of the smoke channel.

[0020] The carbon dioxide capture system of the embodiment of the present application can comprise the composite absorption tower and the regeneration tower of any one of the above embodiments, and the regeneration tower is in circulation communication with the composite absorption tower. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a schematic diagram of the internal structure of the composite absorption tower of the embodiment of the present application.

[0022] Figure 2 is a schematic diagram of the internal structure of the middle part of the composite absorption tower of the embodiment of the present application.

[0023] Figure 3 is Figure 2 is an enlarged view at A.

[0024] Figure 4 is a schematic diagram of the internal structure of the top of the composite absorption tower of the embodiment of the present application.

[0025] Figure 5 is a layout diagram of the cooling assembly of the embodiment of the present application.

[0026] REFERENCE NUMERALS:

[0027] tower body 1; filler sub-chamber 11;

[0028] filler support 2; upper cross beam 21; lower cross beam 22; connecting beam 23;

[0029] heat exchanger 31; busbar 32; main pipe 33; branch pipe 34; cooling bypass (not shown);

[0030] filler block 4;

[0031] liquid collecting tank 5; smoke channel 51;

[0032] distributor 6;

[0033] liquid return buffer tank 71; liquid discharge pipe 72;

[0034] upper cover plate 8;

[0035] The guide vane 9 comprises a first connecting plate 91, a guide plate 92, a second connecting plate 93 and a guide baffle 94.

[0036] The grid pressure plate 10. DETAILED DESCRIPTION

[0037] Embodiments of the present application are described in detail below with reference to examples of embodiments shown in the attached drawings. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0038] Reference is made below to Figures 1-5 A composite absorption tower and a carbon dioxide capture system are described for embodiments of the present application.

[0039] The composite absorption tower of embodiments of the present application comprises a tower body 1, a packing support 2, a cooling assembly, a plurality of packing blocks 4 and a liquid collecting tank 5.

[0040] The tower body 1 has a cavity therein, and the tower body 1 is provided with an air inlet and an air outlet. The packing support 2 is arranged in the cavity, and the packing support 2 and the tower body 1 define a reaction chamber. The cooling assembly is arranged in the reaction chamber in a longitudinal and transverse staggered manner and is separated by the tower body 1 into a plurality of packing sub-chambers 11. The plurality of packing blocks 4 are correspondingly arranged in the packing sub-chambers 11. The cooling assembly circulates a refrigerant therein. The liquid collecting tank 5 is arranged below the reaction chamber to collect the absorption liquid.

[0041] The composite absorption tower of embodiments of the present application has the cooling assembly arranged in the reaction chamber in a longitudinal and transverse staggered manner, and the cooling assembly and the tower body 1 define a plurality of packing sub-chambers 11. Thus, the absorption liquid absorbs CO2 while directly exchanging heat with the cooling assembly (i.e. from indirect heat exchange to direct contact heat exchange), so that the absorption liquid is maintained at a relatively low temperature (because the relatively low temperature has a relatively high adsorption property for the absorption liquid). Thus, it is helpful to improve the concentration of the rich liquid and the adsorption efficiency of CO2. In addition, the cooling assembly is arranged in the reaction chamber in a longitudinal and transverse staggered manner to directly exchange heat with the absorption liquid. The absorption liquid does not need to be collected and discharged out of the tower body 1, and then circulated to the outside of the tower by a circulating pump for cooling. Only a heat exchange pipeline needs to be arranged in the interior of the tower body. Thus, it is helpful to reduce the energy consumption for treating flue gas and to reduce the equipment investment cost.

[0042] Thus, the composite absorption tower of embodiments of the present application has the advantages of reducing energy consumption, improving heat exchange efficiency and reducing equipment investment.

[0043] As Figure 1 and Figure 2As shown, the tower body 1 is spaced along its height direction with multiple reaction chambers, and each reaction chamber is uniformly provided with a cooling assembly. The liquid collecting tank 5 is provided with at least one exhaust port, and the exhaust port is located above the most upstream reaction chamber. The gas inlet is located below the most downstream reaction chamber. Each reaction chamber has a liquid inlet, and the liquid collecting tank 5 has a liquid outlet. The liquid outlet of the reaction chamber at the upper level is communicated with the liquid inlet of the reaction chamber at the lower level adjacent to it.

[0044] The composite absorption tower of the embodiment of the present application is spaced along the height direction of the tower body 1 with multiple reaction chambers, and each reaction chamber is uniformly provided with a cooling assembly. Each reaction chamber is provided with a liquid collecting tank 5 below. Multi-stage absorption allows gas to contact the absorption liquid multiple times, which means that more CO2 can be removed from the remaining gas flow at each stage. The total absorption surface area of the absorption liquid and the contact time are increased, thereby improving the overall absorption efficiency. Moreover, because the absorption process is an exothermic process, and the flue gas inlet is arranged opposite to the absorption liquid, by communicating the liquid outlet of the liquid collecting tank 5 of the reaction chamber at the upper level with the liquid inlet of the reaction chamber at the lower level adjacent to it, the temperature of the absorption liquid decreases in the direction from bottom to top along with the flow direction of the flue gas, thereby helping to improve the saturation of the absorption liquid for CO2 absorption and helping to recover heat between each stage of the reaction chamber. The energy required for external heating can be saved, thereby reducing the energy consumption of the entire system.

[0045] In addition, through multi-stage absorption of flue gas, high-efficiency absorption can be achieved in a smaller single tower unit, thereby helping to further reduce the size and construction cost of the tower body 1 while maintaining a certain absorption rate.

[0046] For example, as shown in Figure 1 The tower body 1 is spaced along its height direction with a first packing support 2, a second packing support 2, a third packing support 2, a fourth packing support 2 and a fifth packing support 2, so as to form a first reaction chamber, a second reaction chamber, a third reaction chamber, a fourth reaction chamber and a fifth reaction chamber spaced from top to bottom. The cooling assembly has three, and the three cooling assemblies are a first cooling assembly, a second cooling assembly, a third cooling assembly, a fourth cooling assembly and a fifth cooling assembly. The first cooling assembly is arranged in the first reaction chamber, the second cooling assembly is arranged in the second reaction chamber, the third cooling assembly is arranged in the third reaction chamber, and so on. The liquid collecting tank 5 can be arranged below the fifth reaction chamber.

[0047] As shown in Figure 2As shown, the cooling assembly includes a heat exchanger 31, a manifold 32, a plurality of main pipes 33 and a plurality of branch pipes 34, the heat exchanger 31 is communicated with the plurality of main pipes 33 through the manifold 32, each branch pipe 34 is communicated with the main pipe 33, each main pipe 33 extends along the extension direction of the packing support 2, the plurality of branch pipes 34 extend along the height direction of the tower body 1, and the plurality of branch pipes 34 and the packing support 2 and / or the tower body 1 define the packing sub-chamber 11.

[0048] It can be understood that the plurality of main pipes 33 extend along the extension direction of the packing support 2 to define the packing sub-chamber 11, and the cooling of the bottom of the packing block 4 corresponding to the reaction chamber can be realized, and the plurality of branch pipes 34 extend along the height direction of the tower body 1, and the cooling of the side of the packing block 4 corresponding to the reaction chamber can be realized.

[0049] The composite absorption tower of the embodiment of the present application divides the cooling assembly into the heat exchanger 31, the manifold 32, the plurality of main pipes 33 and the plurality of branch pipes 34, the plurality of main pipes 33 extend along the extension direction of the packing support 2, and the plurality of branch pipes 34 extend along the height direction of the tower body 1. Thus, the heat exchange of the bottom edge and the plurality of side edges of the packing block 4 is realized, which not only improves the heat exchange efficiency, but also helps to improve the uniformity of the absorption liquid temperature. Therefore, the composite absorption tower of the embodiment of the present application helps to further improve the absorption efficiency of the absorption liquid.

[0050] Further, the plurality of main pipes 33 extend along the direction perpendicular to the height of the tower body 1, and the plurality of branch pipes 34 can be regularly arranged to form a plurality of packing sub-chambers 11 in triangular, square or rectangular structure. That is, the plurality of branch pipes 34 can be arranged in the interior of the reaction chamber and clamped between adjacent packing blocks 4, and the packing block can be cooled in time. Therefore, the composite absorption tower of the embodiment of the present application greatly improves the heat exchange efficiency.

[0051] As shown in Figure 1 and Figure 2 As shown, the packing support 2 includes an upper cross beam 21, a lower cross beam 22 and a connecting beam 23 arranged below the reaction chamber, the upper cross beam 21 is connected with the lower cross beam 22 through the connecting beam 23, at least part of the plurality of main pipes 33 extend along the extension direction of the upper cross beam 21, the main pipe 33 is attached to the side wall surface of the upper cross beam 21, and the upper end surface of the main pipe 33 is lower than or flush with the upper end surface of the upper cross beam 21.

[0052] The composite absorption tower of the embodiment of the present application has the advantages of good structural stability and high heat transfer efficiency. The upper end surface of the main pipeline 33 is lower than or flush with the upper end surface of the upper cross beam 21, which prevents the deformation and fracture of the main pipeline 33 caused by the pressure holding of the packing block 4 on the main pipeline 33. Thus, the composite absorption tower of the embodiment of the present application has the advantages of good structural stability and high heat transfer efficiency.

[0053] As shown in Figure 1 and Figure 2 The composite absorption tower of the embodiment of the present application further comprises a plurality of distributors 6, which are arranged above the plurality of reaction chambers one by one. The distributor 6 is arranged above the packing block 4 of the same reaction chamber. The distributor 6 comprises a liquid inlet, a liquid outlet and a plurality of atomizing nozzles. The liquid inlet is in communication with the distributor 6. The atomizing nozzles are arranged on the distributor 6. The liquid outlet is in communication with the reaction chamber and is arranged adjacent to the packing support 2. The plurality of atomizing nozzles are uniformly distributed on the distributor 6. It can be understood that the distributor 6 is arranged above each reaction chamber.

[0054] The composite absorption tower of the embodiment of the present application has the advantages of good structural stability and high heat transfer efficiency. The plurality of distributors 6 are arranged above the plurality of reaction chambers one by one. The liquid absorption liquid is uniformly distributed on the packing block by the distributor 6, which ensures that the packing surface is fully wetted and increases the gas-liquid contact area. Thus, the composite absorption tower of the embodiment of the present application can improve the efficiency of the absorption liquid absorption rate. In addition, the atomizing nozzles can atomize the absorption liquid, increase the surface area of the absorption liquid, and further increase the gas-liquid contact area. Thus, the composite absorption tower of the embodiment of the present application further improves the efficiency of the absorption liquid absorption rate.

[0055] In addition, the atomizing nozzles can further improve the distribution of the absorption liquid and increase the gas-liquid contact area. Thus, the composite absorption tower of the embodiment of the present application further improves the efficiency of the absorption liquid absorption rate.

[0056] Alternatively, the distributor 6 is a groove disc distributor. The groove disc distributor can collect and redistribute the liquid. In addition to improving the uniformity of the liquid distribution, it also ensures the uniform distribution of the gas on the packing layer or the tray, further enhances the gas-liquid contact, ensures the uniform coverage of the liquid in the tower, avoids the liquid flow deviation, and improves the effective utilization of the mass transfer area. Thus, the composite absorption tower of the embodiment of the present application has the advantage of further improving the heat exchange efficiency.

[0057] The composite absorption tower further comprises a grid pressing plate 10, which is arranged on the filler block 4 to increase the weight of the position and avoid the floating of the filler.

[0058] As shown in Figure 1 and Figure 4 The composite absorption tower further comprises a liquid return buffer tank 71 and a plurality of liquid discharge pipes 72. The liquid return buffer tank 71 is arranged at the top of the tower body 1 and has a liquid return cavity. The tower body 1 has a liquid return opening communicating with the liquid return cavity. The liquid return cavity is located above the distributor 6 corresponding to the most upstream reaction chamber. The plurality of liquid discharge pipes 72 extend horizontally and extend into the space between the distributor 6 and the liquid return buffer tank 71.

[0059] The composite absorption tower has the advantages that the liquid return buffer tank 71 arranged at the top of the tower body can buffer the recycled lean liquid, and the space at the top of the tower body 1 is fully utilized. Therefore, the composite absorption tower has the advantage of improving the utilization rate of the tower body 1. In addition, the plurality of liquid discharge pipes 72 arranged between the distributor 6 and the liquid return buffer tank 71 can help to uniformly distribute the liquid absorbent on the filler layer of the absorption tower, further increasing the gas-liquid contact area. Therefore, the composite absorption tower further improves the efficiency of the liquid absorbent absorption rate.

[0060] Optionally, the plurality of liquid discharge pipes 72 extend along the length or width direction of the tower body 1, and a plurality of nozzles are arranged on the liquid discharge pipe 72 along the length direction thereof. Therefore, the composite absorption tower further improves the uniformity of the uniform distribution of the liquid absorbent.

[0061] As shown in Figure 4 The composite absorption tower further comprises an upper cover plate 8, and the cooling assembly further comprises a cooling bypass. The cooling bypass is arranged in communication with the heat exchanger 31 corresponding to the most upstream reaction chamber. The upper cover plate 8 is arranged between the liquid return buffer tank 71 and the distributor 6 corresponding to the most upstream reaction chamber. The upper cover plate 8 has a plurality of air permeable holes, and the cooling bypass is arranged on the upper cover plate 8. The flue gas can be discharged through the air permeable holes without affecting the flow direction of the flue gas flow in the tower body 1.

[0062] The composite absorption tower further comprises an upper cover plate 8 arranged between the liquid return buffer tank 71 and the distributor 6 corresponding to the most upstream reaction chamber. The upper cover plate 8 can also block the water mist sprayed by the liquid discharge pipe 72 from overflowing under the driving of the flue gas flow. The absorbent in the flue gas can be blocked and dropped into the reaction chamber after meeting the upper cover plate 8. In addition, the cooling bypass arranged can further cool the gas discharged from the absorption tower, condense and return the absorbent carried in the gas to the reaction chamber, and reduce the loss of the absorbent.

[0063] Further, the upper cover plate 8 comprises a cover plate body and a mesh cloth layer, the cover plate body has a dome-shaped top, and the cooling bypass is clamped between the mesh cloth layer and the cover plate body, and the cover plate body has a plurality of air permeable holes.

[0064] The composite absorption tower of the embodiment of the present application can further block the absorption liquid through the mesh cloth layer by clamping the cooling bypass between the mesh cloth layer and the cover plate body. In addition, the dome-shaped top of the cover plate body can promote the reflux of the absorption liquid and form a liquid cloth on the mesh cloth layer, which helps to improve the gas-liquid contact time. In turn, the absorption effect of flue gas is improved.

[0065] As shown in Figure 4 The outer edge of the liquid collecting tank 5 is connected with the inner wall of the tower body 1, the liquid collecting tank 5 has a plurality of spaced smoke passing holes, the inner wall of each smoke passing hole extends upward close to the filler support 2 to form a smoke passing channel 51, and the smoke passing channel 51, the liquid collecting tank 5 and the tower body 1 define a liquid storage cavity.

[0066] The composite absorption tower of the embodiment of the present application has the advantage of good structural integrity by forming the smoke passing channel 51 and the liquid storage cavity on the structure of the liquid collecting tank 5 itself.

[0067] Further, the smoke passing hole at the bottom of the liquid collecting tank 5 can be provided with a pipe passing through the smoke passing hole by setting a cylindrical structure, and the connection between the two is sealed by a sealing structure.

[0068] As shown in Figure 2 and Figure 3 The composite absorption tower of the embodiment of the present application further comprises a flow guide 9, the flow guide 9 comprises a first connecting plate 91, a flow guide plate 92, a second connecting plate 93 and a flow guide baffle 94 connected in sequence, the first connecting plate 91 is connected with the upper end of the smoke passing channel 51, the flow guide plate 92 is an upper convex conical plate, the top of the flow guide plate 92 has a smoke exhaust hole, the lower end of the upper convex conical plate is connected with the second connecting plate 93, the second connecting plate 93 and the upper convex conical plate form a flow guide cavity, the second connecting plate 93 has a flow guide hole for the absorption liquid to flow out, the flow guide baffle 94 is a lower convex conical plate, the lower convex conical plate is connected between two adjacent smoke passing channels 51, and the orthographic projection of the lower convex conical plate partially overlaps the smoke passing channel 51.

[0069] The composite absorption tower of the embodiment of the present application can avoid the absorption liquid flowing out through the smoke channel 51 by the flow guide 9 arranged at the top of the smoke channel 51, and is beneficial to the collection of the absorption liquid. In addition, the flow guide 9 comprises a first connecting plate 91, a flow guide plate 92, a second connecting plate 93 and a flow guide baffle 94 connected in sequence, the first connecting plate 91 is connected with the upper end of the smoke channel 51, the flow guide plate 92 is an upper convex conical plate, the top of the flow guide plate 92 has a smoke exhaust hole, and the flow guide baffle 94 is a lower convex conical plate, which can not only avoid the absorption liquid flowing into the smoke channel 51 as much as possible, but also not block the flow of flue gas. The lower end of the upper convex conical plate is connected with the second connecting plate 93, and the flow guide cavity is formed between the second connecting plate 93 and the upper convex conical plate. The second connecting plate 93 has a flow guide hole to discharge the absorption liquid collected here. Therefore, the composite absorption tower of the embodiment of the present application has the advantages of simple structure and good flow guide effect.

[0070] The carbon dioxide capture system of the embodiment of the present application comprises the composite absorption tower according to any one of the above embodiments and the regeneration tower according to any one of the above embodiments, and the regeneration tower is in circulation communication with the composite absorption tower.

[0071] Therefore, the carbon dioxide capture system of the embodiment of the present application has the advantages of reducing energy consumption, improving heat exchange efficiency and reducing equipment investment.

[0072] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0073] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0074] In the present application, unless specifically defined otherwise, the terms "mounting", "connected", "connecting", "fixed", "fixedly connected", "connection", "fixedly connected", "connected", "fixed", and the like should be construed broadly, for example, can be fixed connection, can be detachable connection, or integral; can be mechanical connection, can be electrical connection or communication with each other; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically defined. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0075] In the present application, unless specifically defined otherwise, the first feature is "on" or "under" the second feature. The first and second features can be in direct contact, or the first and second features can be in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.

[0076] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in the specification and the features of different embodiments or examples without contradiction.

[0077] Although the embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and cannot be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A composite absorption column, characterized by, The application relates to a tower body and a packing support, wherein the tower body is internally provided with a chamber, the tower body is externally provided with an air inlet and an air outlet, the packing support is arranged in the chamber, and the packing support and the tower body define a reaction chamber; a cooling assembly and a plurality of packing blocks, the cooling assembly is arranged in the reaction chamber in a longitudinal and transverse staggered mode and defines a plurality of packing sub-chambers with the tower body, the plurality of packing blocks are correspondingly arranged in the packing sub-chambers, and the cooling assembly circulates refrigerant; a liquid collecting tank arranged below the reaction chamber to collect absorption liquid; the tower body is provided with a plurality of reaction chambers arranged in a height direction, the cooling assembly is arranged in each reaction chamber, the liquid collecting tank is provided with at least one liquid outlet, the air outlet is arranged above the most upstream reaction chamber, the air inlet is arranged below the most downstream reaction chamber, each reaction chamber is provided with a liquid inlet, the liquid collecting tank is provided with a liquid outlet, and the liquid outlet of the upper reaction chamber is communicated with the liquid inlet of the lower reaction chamber; the cooling assembly comprises a heat exchanger, a busbar, a plurality of main pipes and a plurality of branch pipes, the heat exchanger is communicated with the plurality of main pipes through the busbar, each branch pipe is communicated with the main pipe, each main pipe extends along the extension direction of the packing support, each branch pipe extends along the height direction of the tower body to define the packing sub-chamber, and the plurality of branch pipes define the packing sub-chamber with the packing support and / or the tower body; the packing support comprises an upper cross beam arranged below the reaction chamber, a lower cross beam and a connecting beam, the upper cross beam and the lower cross beam are connected through the connecting beam, at least part of the plurality of main pipes extends along the extension direction of the upper cross beam, the main pipe is attached to the side wall surface of the upper cross beam, and the upper end surface of the main pipe is lower than or flush with the upper end surface of the upper cross beam; and / or the application further comprises a plurality of distributors, the plurality of distributors are arranged above the plurality of reaction chambers one by one, the distributor is arranged above the packing block of the same reaction chamber, the distributor comprises a liquid inlet, a liquid outlet and a plurality of atomizing nozzles, the liquid inlet is communicated with the distributor, the liquid outlet is communicated with the reaction chamber, and the liquid outlet is arranged close to the packing support, and the plurality of atomizing nozzles are uniformly distributed on the distributor; and / or the application further comprises a grid pressing plate arranged on the packing block to prevent the packing from floating up. The application further comprises a liquid return buffer tank and a plurality of liquid discharge pipes, the liquid return buffer tank is arranged on the top of the tower body, the liquid return buffer tank is provided with a liquid return cavity, the tower body is provided with a liquid return port communicated with the liquid return cavity, the liquid return cavity is arranged above the distributor of the most upstream reaction chamber, and the plurality of liquid discharge pipes extend in a horizontal direction and extend into the space between the distributor and the liquid return buffer tank. ​ ​ ​ ​ ​ ​ ​ 2. The composite absorption column of claim 1, wherein, ​ 3. The composite absorption column of claim 2, wherein, The cooling assembly further comprises a cooling bypass communicating with the heat exchanger corresponding to the reaction chamber arranged at the most upstream, and an upper cover plate arranged between the liquid return buffer tank and the distributor corresponding to the reaction chamber arranged at the most upstream, the upper cover plate having a plurality of air permeable holes, and the cooling bypass being arranged on the upper cover plate.

4. The composite absorption column of claim 3, wherein The upper cover plate comprises a cover plate body having a dome-shaped top and a mesh cloth layer, the cooling bypass being clamped between the mesh cloth layer and the cover plate body, and the cover plate body having a plurality of air permeable holes.

5. The composite absorption column according to any one of claims 1-4, characterized in that, The outer edge of the collecting tank is connected with the inner wall of the tower body, the collecting tank has a plurality of smoke passing holes arranged at intervals, the inner wall of each smoke passing hole extends upward close to the packing support to form a smoke passing channel, and the smoke passing channel, the collecting tank and the tower body define a liquid storage cavity.

6. The composite absorption column of claim 5, wherein, The flow guide member comprises a first connecting plate, a flow guide plate, a second connecting plate and a flow guide baffle connected in sequence, the first connecting plate is connected with the upper end of the smoke passing channel, the flow guide plate is an upper convex cone plate, the top of the flow guide plate has a smoke exhaust hole, the lower end of the upper convex cone plate is connected with the second connecting plate, a flow guide cavity is formed between the second connecting plate and the upper convex cone plate, the second connecting plate has a flow guide hole for discharging the absorption liquid, the flow guide baffle is a lower convex cone plate, the lower convex cone plate is connected between two adjacent smoke passing channels, and the orthographic projection of the lower convex cone plate partially overlaps the orthographic projection of the smoke passing channel.

7. A carbon dioxide capture system characterized by, The composite absorption tower according to any one of claims 1-6 and a regeneration tower in circulation communication with the composite absorption tower are included.

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