Rotational flow injection device and carbon dioxide desorption regeneration system

Abstract

The utility model discloses a swirl injection device and a carbon dioxide desorption and regeneration system, and relates to the technical field of carbon dioxide desorption and regeneration, on one hand, the swirl injection device comprises a cylinder and a jacket coaxially arranged outside the cylinder in a sleeving mode, the interior of the cylinder is hollow, and the bottom end of the cylinder communicates with a swirl injection drainage pipe; an overflow pipe is arranged at the upper end of the barrel, and the rotary spraying liquid discharging pipe, the barrel and the overflow pipe are all in a communicated state; a tangential liquid inlet pipe communicated with the cylinder body is arranged on the side surface of the upper end of the cylinder body; the jacket is hollow, so that a liquid storage cavity is formed between the jacket and the barrel, and a liquid inlet pipe communicated with the liquid storage cavity is connected to the jacket; a plurality of spraying holes are formed in the cylinder body, and each spraying hole is communicated with the liquid storage cavity and the cylinder body. On the other hand, the utility model discloses a carbon dioxide desorption and regeneration system which comprises the swirl injection device and a phase splitting device used for liquid feeding. The desorption device has the advantages of being high in desorption efficiency and convenient to use.

Description

Technical Field

[0001] The present application relates to the technical field of carbon dioxide desorption and regeneration, and in particular to a swirl injection device and a carbon dioxide desorption and regeneration system. Background Art

[0002] With global industrialization and energy consumption, anthropogenic carbon dioxide emissions have increased the concentration of carbon dioxide in the atmosphere from 280ppm to 410ppm, which has had a significant impact on the environment, humans and ecosystems, leading to global warming and climate change. Therefore, carbon dioxide emission reduction has received attention from countries around the world. At present, countries around the world generally believe that carbon capture and storage (CCS) technology and the later evolved carbon capture, utilization and storage (CCUS) technology are effective measures to reduce carbon dioxide emissions.

[0003] Due to the mature technology, the chemical absorption method of alcohol amine aqueous solution is widely used in industry for carbon dioxide capture. Various amine-based absorbents have been studied in the past few decades, including primary amines, secondary amines, tertiary amines and mixed amines, such as primary and secondary monoethanolamine (MEA), secondary amine diethanolamine (DEA) and tertiary amine N-methyldiethanolamine (MDEA). However, the absorption process of these amine absorbents is energy-intensive. The research focus of carbon dioxide capture is to reduce the energy consumption in the carbon dioxide capture process. Studies have shown that regeneration energy consumption accounts for about 70% of the energy consumption of the entire system. Reducing the energy consumed in the desorption process of alcohol amines is an important factor in controlling the energy cost of the entire carbon capture process. The desorption capacity of alcohol amine solution is one of the important factors affecting the energy consumption of alcohol amine desorption.

[0004] The main ways to reduce desorption energy consumption are to develop new absorbents and new capture processes. In recent years, phase change absorbents have been widely studied by scholars. After absorbing carbon dioxide, they are divided into upper and lower phases. Carbon dioxide is enriched in the lower liquid phase. It only needs to enter the desorption unit to complete regeneration. In theory, it can reduce the amount of liquid entering the desorption unit to reduce the sensible heat of heating and water evaporation energy consumption. Therefore, phase change absorbents are expected to reduce the desorption energy consumption in the chemical absorption capture process.

[0005] Although phase change absorbents have great potential in reducing desorption energy consumption, there are still some shortcomings that need to be overcome, such as high viscosity and poor desorption effect when the absorbent enters the lower liquid phase for desorption.

[0006] In view of this, it is necessary to design a new carbon dioxide desorption and regeneration device to overcome the above technical problems and thus improve the absorption efficiency. Utility Model Content

[0007] The purpose of the present application is to overcome the problem of low carbon dioxide desorption efficiency in the prior art. On the one hand, a cyclone injection device is provided, in which lean amine liquid and rich amine liquid form a rotating turbulent flow field and a jet flow field respectively, and the rotating turbulent flow field and the jet flow field cut and crush each other, and heat exchange regeneration is performed under the action of the flow field, thereby improving the carbon dioxide desorption efficiency;

[0008] On the other hand, the present application also provides a carbon dioxide desorption regeneration system, which divides the absorption liquid from the carbon dioxide absorption tower into lean amine liquid and rich amine liquid through a phase separation device, and transports them to a cyclone injection device. The carbon dioxide desorption efficiency is high and the use effect is good.

[0009] In order to achieve the above-mentioned purpose, the present application provides a swirl injection device, including a cylinder and a jacket coaxially sleeved on the outside of the cylinder, the interior of the cylinder is hollow, the bottom end of the cylinder is connected to a swirl injection drain pipe, the upper end of the cylinder is provided with an overflow pipe, and the swirl injection drain pipe, the cylinder, and the overflow pipe are all in a connected state;

[0010] A tangential liquid inlet pipe connected to the cylinder is provided on the upper end side of the cylinder;

[0011] The jacket is hollow so that a liquid storage cavity is formed between the jacket and the cylinder, and a liquid inlet pipe connected to the liquid storage cavity is connected to the jacket;

[0012] A plurality of injection holes are arranged on the cylinder body, and each injection hole is connected with the liquid storage cavity and the cylinder body.

[0013] In some embodiments, a liquid storage tank is also included, on which a recovery pipe, a circulation pipe and a discharge pipe connected to the liquid storage tank are provided, and the upper end of the recovery pipe is connected to the rotary spray discharge pipe.

[0014] In some embodiments, a circulation port is provided on the jacket, the circulation port is communicated with the liquid storage chamber, a circulation pipe is provided between the liquid storage tank and the circulation port, and a control pump and a circulation heater are provided on the circulation pipe.

[0015] In some embodiments, the diameter of the lower end of the rotary spray drainage pipe is smaller than the diameter of the upper end.

[0016] In some embodiments, the injection holes are arranged in multiple rows along the length direction of the cylinder, the multiple rows of injection holes are arranged at equal intervals, and the injection holes in each row are evenly arranged along the circumference of the cylinder.

[0017] In some embodiments, the tangential liquid inlet pipe includes a horizontal pipe and a vertical pipe that are interconnected, the lower end of the vertical pipe is inserted into the cylinder, and the vertical pipe is spaced apart from the overflow pipe.

[0018] In some embodiments, a thermal insulation layer is disposed outside the cylinder and the jacket.

[0019] On the other hand, the present application provides a carbon dioxide desorption and regeneration system, comprising the above-mentioned swirl injection device and a phase separation device for injecting liquid into the swirl injection device.

[0020] In some embodiments, the phase separation device includes a phase separation box, a lean amine liquid inlet pipe and a rich amine liquid inlet pipe connected to the phase separation box, the lean amine liquid inlet pipe is connected to the tangential liquid inlet pipe, and the rich amine liquid inlet pipe is connected to the liquid inlet pipe.

[0021] In some embodiments, the phase separation device further comprises centrifugal pumps arranged on the lean amine liquid inlet pipe and the rich amine liquid inlet pipe, and a liquid inlet heater is arranged on the lean amine liquid inlet pipe.

[0022] Through the above technical scheme, the absorption liquid from the carbon dioxide absorption tower is divided into lean amine liquid and rich amine liquid through the phase separation device, the lean amine liquid enters the cylinder through the lean amine liquid inlet pipe and the tangential liquid inlet pipe to generate a rotating turbulent field, the rich amine liquid enters the liquid storage chamber through the rich amine liquid inlet pipe and the liquid inlet pipe, and is then sprayed into the cylinder through the jet hole to form a jet flow field, the rotating turbulent flow field and the jet flow field cut and crush each other, and heat exchange regeneration is carried out under the action of the flow field, and the desorbed carbon dioxide gas is discharged from the overflow pipe, thereby improving the carbon dioxide desorption efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the swirl injection device in the embodiment of the present application;

[0024] Figure 2 It is a structural schematic diagram of the carbon dioxide desorption and regeneration system in the embodiment of the present application.

[0025] Description of Reference Numerals

[0026] 1. Cylinder; 11. Spray hole; 12. Insulation layer; 2. Jacket; 21. Circulation port; 3. Rotary spray discharge pipe; 4. Overflow pipe; 5. Tangential liquid inlet pipe; 6. Liquid storage chamber; 7. Liquid inlet pipe; 8. Liquid storage tank; 81. Recovery pipe; 82. Circulation pipe; 821. Control pump; 822. Circulation heater; 83. Discharge pipe; 9. Phase separation box; 91. Lean amine liquid inlet pipe; 92. Rich amine liquid inlet pipe; 93. Centrifugal pump; 94. Liquid inlet heater. DETAILED DESCRIPTION

[0027] The specific implementation of the present application is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present application, and is not used to limit the present application.

[0028] In this application, unless otherwise stated, the meaning of "multiple" is greater than or equal to two; the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating directions or positional relationships, are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present disclosure. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0029] On the one hand, referring to Figure 1 The present application discloses a swirl jet device, comprising a cylinder 1 and a jacket 2 coaxially sleeved on the outside of the cylinder 1, the cylinder 1 is hollow inside, the bottom end of the cylinder 1 is connected to a swirl jet drain pipe 3, the upper end of the cylinder 1 is provided with an overflow pipe 4, the swirl jet drain pipe 3, the cylinder 1, and the overflow pipe 4 are all in a connected state;

[0030] A tangential liquid inlet pipe 5 communicating with the cylinder 1 is provided on the upper end side of the cylinder 1;

[0031] The jacket 2 is hollow so that a liquid storage cavity 6 is formed between the jacket 2 and the cylinder 1, and a liquid inlet pipe 7 connected to the liquid storage cavity 6 is connected to the jacket 2;

[0032] The cylinder 1 is provided with a plurality of injection holes 11 , each of which connects the liquid storage chamber 6 and the cylinder 1 .

[0033] The swirl jet device disclosed in the present application comprises a barrel 1, which is cylindrical, has openings at both ends and is hollow inside, and the axial direction of the barrel 1 is arranged in the vertical direction. The lower end of the barrel 1 is connected with a swirl jet drainage pipe 3, and the length direction of the swirl jet drainage pipe 3 is consistent with the length direction of the barrel 1. An overflow pipe 4 is inserted at the upper end of the barrel 1, and the overflow pipe 4 is arranged in the vertical direction. The lower end of the overflow pipe 4 is inserted into the barrel 1 so that the overflow pipe 4 is connected with the barrel 1, and the length direction of the overflow pipe 4 is consistent with the length direction of the barrel 1.

[0034] A tangential liquid inlet pipe 5 is also inserted on the upper end surface of the cylinder 1 . During use, lean amine liquid enters the cylinder 1 through the tangential liquid inlet pipe 5 .

[0035] A jacket 2 is provided outside the cylinder 1. The jacket 2 is cylindrical and coaxial with the cylinder 1. The inside of the jacket 2 is hollow, so that a liquid storage cavity 6 is formed between the inner wall of the jacket 2 and the outer wall of the cylinder 1. A liquid inlet pipe 7 is inserted on the outer wall of the jacket 2. The liquid inlet pipe 7 is horizontally arranged, and liquid can be introduced into the liquid storage cavity 6 through a liquid storage tank 8. A plurality of injection holes 11 are provided on the outer wall of the lower part of the cylinder 1. Each injection hole 11 is wrapped by the jacket 2. The injection holes 11 communicate with the liquid storage cavity 6 and the inner cavity of the cylinder 1. During use, the liquid inlet pipe 7 is connected to the external liquid inlet pipeline, and the rich amine liquid enters the liquid storage cavity 6 through the liquid inlet pipe 7, and then is sprayed into the cylinder 1 by the jet of the injection hole 11.

[0036] The lean amine liquid enters the cylinder 1 through the tangential liquid inlet pipe 5 to generate a rotating turbulent field, and the rich amine liquid enters the liquid storage chamber 6 through the liquid inlet pipe 7, and is then sprayed into the cylinder 1 from the injection hole 11 to form a jet flow field. The rotating turbulent flow field and the jet flow field cut and crush each other, and heat exchange regeneration is carried out under the action of the flow field. The desorbed carbon dioxide gas is discharged from the overflow pipe 4, and the remaining liquid flows out from the rotary spray discharge pipe 3.

[0037] Reference Figure 1 In some embodiments, a liquid storage tank 8 is further included, on which a recovery pipe 81, a circulation pipe 82 and a discharge pipe 83 connected to the liquid storage tank 8 are provided, and the upper end of the recovery pipe 81 is connected to the rotary spray discharge pipe 3.

[0038] In some embodiments, a liquid storage tank 8 is placed below the swirl injection device, and a recovery pipe 81 and a circulation pipe 82 are inserted into the liquid storage tank 8. The recovery pipe 81 is connected to the lower end of the liquid spray discharge pipe 83, so that the liquid storage tank 8 is connected to the inner cavity of the cylinder 1. After the desorption is completed, the liquid storage tank 8 recovers the remaining liquid to avoid liquid leakage affecting the external working environment. A discharge pipe 83 is inserted at the lower part of the right end of the liquid storage tank 8, and the excess liquid in the liquid storage tank 8 is transported to the carbon dioxide absorption tower through the discharge pipe 83.

[0039] Reference Figure 1 The jacket 2 is provided with a circulation port 21 , which is communicated with the liquid storage chamber 6 , a circulation pipe 82 is provided between the liquid storage tank 8 and the circulation port 21 , and a control pump 821 and a circulation heater 822 are provided on the circulation pipe 82 .

[0040] A circulation port 21 is provided on the outer wall of the jacket 2, and the circulation port 21 is connected to the liquid storage chamber 6. The end of the circulation pipe 82 away from the liquid storage tank 8 is inserted into the circulation port 21, so that the circulation pipe 82 is connected to the liquid storage chamber 6. The circulation pipe 82 is provided with a control pump 821 and a circulation heater 822. When the control pump 821 is turned on, the lean amine liquid in the liquid storage tank 8 flows outward through the circulation pipe 82, and after being heated by the circulation heater 822, it flows into the liquid storage chamber 6 through the circulation port 21, and then enters the cylinder 1 through the injection hole 11, and performs heat exchange regeneration with the injected rich amine liquid, so as to realize the recycling of the lean amine liquid.

[0041] Reference Figure 1 In some embodiments, the diameter of the lower end of the rotary spray drain pipe 3 is smaller than the diameter of the upper end.

[0042] In some embodiments, the rotary spray drainage pipe 3 is wide at the top and narrow at the bottom, and the diameter of the end connected to the cylinder 1 is longer than the diameter of the end connected to the recovery pipe 81, which slows down the flow rate of the amine liquid after desorption and improves stability.

[0043] Reference Figure 1 In some embodiments, the injection holes 11 are arranged in multiple rows along the length direction of the cylinder 1 , and the multiple rows of injection holes 11 are arranged at equal intervals. The injection holes 11 in each row are evenly arranged along the circumference of the cylinder 1 .

[0044] In some embodiments, the cylinder 1 is provided with multiple rows of injection holes 11, which are arranged at equal intervals along the length direction of the cylinder 1, and each row includes multiple injection holes 11 evenly arranged at intervals along the circumference of the cylinder 1. The number of injection holes 11 in different rows is equal in each row, and the positions of the injection holes 11 in two adjacent rows above and below correspond to each other. The uniformly arranged injection holes 11 keep the rich amine liquid stable when being injected into the inner cavity of the cylinder 1, thereby improving the stability of the formed injection flow field.

[0045] Reference Figure 1 In some embodiments, the tangential liquid inlet pipe 5 includes a horizontal pipe and a vertical pipe that are interconnected, the lower end of the vertical pipe is inserted into the cylinder 1, and the vertical pipe is spaced apart from the overflow pipe 4.

[0046] The tangential liquid inlet pipe 5 includes a horizontal pipe and a vertical pipe which are interconnected. The lower end of the vertical pipe is inserted into the cylinder 1 and is spaced apart from the overflow pipe 4. The horizontal pipe is connected to an external pipeline.

[0047] Reference Figure 1 In some embodiments, a thermal insulation layer 12 is disposed outside the cylinder 1 and the jacket 2 .

[0048] In some embodiments, a heat-insulating layer 12 is attached to the outside of the cylinder 1 and the jacket 2. The heat in the cylinder 1 is maintained by the heat-insulating layer 12, thereby improving the efficiency of heat exchange regeneration and thus improving the desorption efficiency.

[0049] In a preferred embodiment of the swirl jet device disclosed herein, the barrel 1 includes a barrel 1, which is cylindrical, with both ends of the barrel 1 open and hollow inside, and the axial direction of the barrel 1 is arranged in the vertical direction. The lower end of the barrel 1 is connected to a swirl jet drainage pipe 3, and the length direction of the swirl jet drainage pipe 3 is consistent with the length direction of the barrel 1. The swirl jet drainage pipe 3 is wide at the top and narrow at the bottom, and the diameter of the end connected to the barrel 1 is greater than the diameter of the end away from the barrel 1. An overflow pipe 4 is inserted at the upper end of the barrel 1, and the overflow pipe 4 is arranged in the vertical direction. The lower end of the overflow pipe 4 is inserted into the barrel 1 so that the overflow pipe 4 is connected to the barrel 1, and the length direction of the overflow pipe 4 is consistent with the length direction of the barrel 1.

[0050] A tangential liquid inlet pipe 5 is inserted on the upper end surface of the cylinder 1. The tangential liquid inlet pipe 5 includes a horizontal pipe and a vertical pipe that are interconnected. The lower end of the vertical pipe is inserted into the cylinder 1 and is spaced apart from the overflow pipe 4. The horizontal pipe is connected to an external pipeline.

[0051] A jacket 2 is provided on the outer surface of the cylinder 1. The jacket 2 is cylindrical and coaxial with the cylinder 1. The inside of the jacket 2 is hollow, so that a liquid storage cavity 6 is formed between the inner wall of the jacket 2 and the outer wall of the cylinder 1. A heat-insulating layer 12 is attached to the outside of the cylinder 1 and the jacket 2. A liquid inlet pipe 7 is inserted on the outer wall of the jacket 2. The liquid inlet pipe 7 is arranged horizontally, and liquid can be introduced into the liquid storage cavity 6 through the liquid storage tank 8. A plurality of injection holes 11 are opened on the outer wall of the lower part of the cylinder 1. Each injection hole 11 is wrapped by the jacket 2, and the injection hole 11 connects the liquid storage cavity 6 and the inner cavity of the cylinder 1.

[0052] There are multiple rows of injection holes 11 on the cylinder 1, and the multiple rows of injection holes 11 are arranged at equal intervals along the length direction of the cylinder 1. Each row includes multiple injection holes 11 evenly arranged along the circumference of the cylinder 1. The number of injection holes 11 in different rows is equal in each row, and the positions of the injection holes 11 in two adjacent rows above and below correspond to each other.

[0053] A liquid storage tank 8 is placed below the swirl injection device. A recovery pipe 81 is inserted into the liquid storage tank 8. The recovery pipe 81 is connected to the lower end of the liquid spray discharge pipe 83, so that the liquid storage tank 8 is connected to the inner cavity of the cylinder 1. After the desorption is completed, the liquid storage tank 8 recovers the remaining liquid. A discharge pipe 83 is inserted into the lower part of the right end of the liquid storage tank 8. The excess liquid in the liquid storage tank 8 is transported to the carbon dioxide absorption tower through the discharge pipe 83. A circulation pipe 82 is inserted into the liquid storage tank 8, and a circulation port 21 is opened on the outer wall of the jacket 2. The circulation port 21 is connected to the liquid storage cavity 6. The end of the circulation pipe 82 away from the liquid storage tank 8 is inserted into the circulation port 21, so that the circulation pipe 82 is connected to the liquid storage cavity 6.

[0054] On the other hand, referring to Figure 2 The present application also discloses a carbon dioxide desorption and regeneration system, comprising the above-mentioned swirl injection device and a phase separation device for feeding liquid into the swirl injection device.

[0055] The carbon dioxide desorption and regeneration system disclosed in the present application comprises a phase separation device and the above-mentioned cyclone injection device connected to the phase separation device, and the phase separation device plays a role in separating the absorption liquid. The absorption liquid from the carbon dioxide absorption tower is transported to the phase separation device, and the absorption liquid is separated into lean amine liquid and rich amine liquid by the phase separation device, and then transported to the cyclone injection device for carbon dioxide desorption and regeneration operation.

[0056] Reference Figure 2 In some embodiments, the phase separation device includes a phase separation box 9, a lean amine liquid inlet pipe 91 and a rich amine liquid inlet pipe 92 connected to the phase separation box 9, the lean amine liquid inlet pipe 91 is connected to the tangential liquid inlet pipe 5, and the rich amine liquid inlet pipe 92 is connected to the liquid inlet pipe 7.

[0057] Reference Figure 2 In some embodiments, the phase separation device further includes a centrifugal pump 93 disposed on the lean amine liquid inlet pipe 91 and the rich amine liquid inlet pipe 92 , and a liquid inlet heater 94 is disposed on the lean amine liquid inlet pipe 91 .

[0058] In some embodiments, the phase separation device includes a phase separation box 9, the upper part of the phase separation box 9 is connected to a lean amine liquid inlet pipe 91, the end of the lean amine liquid inlet pipe 91 away from the phase separation box 9 is connected to the tangential liquid inlet pipe 5 of the swirl injection device, and the lean amine liquid inlet pipe 91 is provided with a centrifugal pump 93 and a liquid inlet heater 94. The lower part of the phase separation box 9 is connected to a rich amine liquid inlet pipe 92, the end of the rich amine liquid inlet pipe 92 away from the phase separation box 9 is connected to the liquid inlet pipe 7 of the swirl injection device, and the rich amine liquid inlet pipe 92 is provided with a centrifugal pump 93. After the absorption liquid from the carbon dioxide absorption tower is phase-separated by the phase separation box 9, the upper part is lean amine liquid and the lower part is rich amine liquid. The lean amine liquid is heated by the liquid inlet heater 94 during the process of passing through the lean amine liquid inlet pipe 91. The heated high-temperature lean amine liquid flows into the cylinder 1 through the tangential liquid inlet pipe 5, and the rich amine liquid directly enters the liquid storage chamber 6 through the rich amine liquid inlet pipe 92 and the liquid inlet pipe 7.

[0059] So far, various embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0060] Although some specific embodiments of the present disclosure have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present disclosure. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict.

Claims

1. A swirl injection device, characterized in that: It comprises a cylinder (1) and a jacket (2) coaxially sleeved on the outside of the cylinder (1); the cylinder (1) is hollow inside; the bottom end of the cylinder (1) is connected to a rotary spray drainage pipe (3); the top end of the cylinder (1) is provided with an overflow pipe (4); the rotary spray drainage pipe (3), the cylinder (1) and the overflow pipe (4) are all in a connected state; The upper end side surface of the cylinder (1) is provided with a tangential liquid inlet pipe (5) which is in communication with the cylinder (1); The jacket (2) is hollow so that a liquid storage cavity (6) is formed between the jacket (2) and the cylinder (1), and a liquid inlet pipe (7) communicating with the liquid storage cavity (6) is connected to the jacket (2); The cylinder (1) is provided with a plurality of injection holes (11), and each of the injection holes (11) is connected to the liquid storage chamber (6) and the cylinder (1).

2. The swirl injection device according to claim 1, characterized in that: It also comprises a liquid storage tank (8), on which a recovery pipe (81), a circulation pipe (82) and a discharge pipe (83) which are in communication with the liquid storage tank (8) are provided, and the upper end of the recovery pipe (81) is in communication with the rotary spray discharge pipe (3).

3. The swirl injection device according to claim 2, characterized in that: The jacket (2) is provided with a circulation port (21), the circulation port (21) is communicated with the liquid storage chamber (6), the circulation pipe (82) is provided between the liquid storage tank (8) and the circulation port (21), and the circulation pipe (82) is provided with a control pump (821) and a circulation heater (822).

4. The swirl injection device according to claim 2, characterized in that: The diameter length of the lower end of the rotary spray liquid discharge pipe (3) is smaller than the diameter length of the upper end.

5. The swirl injection device according to claim 1, characterized in that: The injection holes (11) are arranged in multiple rows at intervals along the length direction of the cylinder (1), the multiple rows of injection holes (11) are arranged at equal intervals, and the injection holes (11) in each row are evenly arranged at intervals along the circumference of the cylinder (1).

6. The swirl injection device according to claim 1, characterized in that: The tangential liquid inlet pipe (5) comprises a horizontal pipe and a vertical pipe which are interconnected, the lower end of the vertical pipe is inserted into the cylinder (1), and the vertical pipe is spaced apart from the overflow pipe (4).

7. The swirl injection device according to claim 1, characterized in that: A thermal insulation layer (12) is provided outside the cylinder (1) and the jacket (2).

8. A carbon dioxide desorption and regeneration system, characterized in that: It comprises a swirl injection device as described in any one of claims 1 to 7 and a phase separation device for feeding liquid into the swirl injection device.

9. The carbon dioxide desorption and regeneration system according to claim 8, characterized in that: The phase separation device comprises a phase separation box (9), a lean amine liquid inlet pipe (91) and a rich amine liquid inlet pipe (92) connected to the phase separation box (9), the lean amine liquid inlet pipe (91) being connected to the tangential liquid inlet pipe (5), and the rich amine liquid inlet pipe (92) being connected to the liquid inlet pipe (7).

10. The carbon dioxide desorption and regeneration system according to claim 9, characterized in that: The phase separation device further comprises a centrifugal pump (93) arranged on the lean amine liquid inlet pipe (91) and the rich amine liquid inlet pipe (92), and the lean amine liquid inlet pipe (91) is provided with an inlet heater (94).

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