Carbon dioxide recovery device, control method thereof, tail gas treatment system and vehicle

Abstract

The invention relates to a carbon dioxide recovery device for a tail gas treatment system, a control method of the carbon dioxide recovery device, the tail gas treatment system and a vehicle. The tail gas treatment system comprises an exhaust end for exhausting tail gas; the carbon dioxide recovery device comprises a carbon dioxide recovery tank; a heat exchanger and a mixer are sequentially arranged on the first pipeline in the tail gas flowing direction, the first pipeline is provided with a first end and a second end, and the first end of the first pipeline communicates with the exhaust end; the second pipeline is provided with a first end and a second end, and the first end of the second pipeline communicates with the exhaust end; the first adsorption unit is provided with an inlet and an outlet; the second adsorption unit is provided with an inlet and an outlet; the third pipeline is provided with a first end and a second end, and the third pipeline is provided with a carbon dioxide concentration sensor which is used for detecting the concentration of carbon dioxide in the third pipeline. According to the carbon dioxide recovery device, carbon dioxide can be efficiently recovered from vehicle tail gas, and the carbon dioxide exhausted into the atmosphere is greatly reduced.

Description

Carbon dioxide recovery devices and their control methods, exhaust gas treatment systems, and vehicles Technical Field

[0001] This application relates to the field of exhaust gas treatment technology, specifically to a carbon dioxide recovery device and its control method for an exhaust gas treatment system, an exhaust gas treatment system equipped with the carbon dioxide recovery device, and a vehicle equipped with the exhaust gas treatment system. Background Technology

[0002] The information provided in this section is for the purpose of generally presenting the background of this disclosure. To the extent described in this section, the work of the currently named inventors and aspects of the description that may not constitute prior art at the time of filing are neither explicitly nor implicitly considered to be prior art of this disclosure.

[0003] With the increasing severity of the global energy crisis and environmental degradation, developing sustainable transportation is an urgent need for the transportation industry. Statistics show that approximately 34% of carbon dioxide emissions and 60% of oil consumption are generated by daily transportation. Energy shortages, traffic congestion, and traffic safety have become serious problems for travel. my country has proposed a "dual-carbon target" and is accelerating the formation of green and low-carbon transportation modes, promoting new energy, intelligent, digital, and lightweight transportation equipment, and encouraging and guiding green travel to make transportation more environmentally friendly and travel more low-carbon. In recent years, carbon emissions from heavy-duty trucks have generally shown a trend of first rising and then stabilizing. Therefore, the management of carbon emissions from mobile sources, especially heavy-duty trucks, is of great significance to achieving the "dual-carbon" strategic goal.

[0004] Application content

[0005] In view of this, according to this application, a carbon dioxide recovery device for an exhaust gas treatment system is provided, the exhaust gas treatment system including an exhaust end for discharging exhaust gases. In the carbon dioxide recovery device according to this application, the carbon dioxide recovery device includes:

[0006] Carbon dioxide recovery tank;

[0007] The first pipeline has a heat exchanger and a mixer arranged sequentially along the direction of exhaust gas flow, and has a first end and a second end, wherein the first end of the first pipeline is connected to the exhaust end;

[0008] The second pipeline has a first end and a second end, the first end of the second pipeline being connected to the exhaust end;

[0009] The first adsorption unit has an inlet and an outlet. The inlet of the first adsorption unit is connected to the second end of the first pipeline through a first valve and to the second end of the second pipeline through a second valve. The outlet of the first adsorption unit is connected to the gas outlet through a third valve.

[0010] The second adsorption unit has an inlet and an outlet. The inlet of the second adsorption unit is connected to the second end of the first pipeline through a fifth valve and to the second end of the second pipeline through a sixth valve. The outlet of the second adsorption unit is connected to the gas outlet through a seventh valve.

[0011] A third pipeline has a first end and a second end. The first end of the third pipeline is connected to the outlet of the first adsorption unit via a fourth valve and to the outlet of the second adsorption unit via an eighth valve. The third pipeline is equipped with a carbon dioxide concentration sensor for detecting the carbon dioxide concentration in the third pipeline.

[0012] A three-way valve having a first port for communication with the second end of the third pipeline, a second port for communication with the mixer, and a third port for communication with the carbon dioxide recovery tank.

[0013] In another advantageous embodiment of the carbon dioxide recovery device according to this application, the heat exchanger is a refrigerant-coolant heat exchanger of any one of shell-and-tube heat exchangers, plate-fin heat exchangers, coaxial heat exchangers, and coil heat exchangers.

[0014] In another advantageous embodiment of the carbon dioxide recovery device according to this application, the refrigerant is brine, ethylene glycol solution, propylene glycol solution, dichloromethane solution, or trichloroethylene solution.

[0015] In another advantageous embodiment of the carbon dioxide recovery device according to this application, both the first adsorption unit and the second adsorption unit are variable temperature adsorption beds.

[0016] In another advantageous embodiment of the carbon dioxide recovery device according to this application, the first adsorption unit and the second adsorption unit are filled with a desiccant, the desiccant comprising one or more of activated carbon, activated alumina, silica gel, carbon molecular sieve and zeolite molecular sieve.

[0017] In another advantageous embodiment of the carbon dioxide recovery device according to this application, the number of the first adsorption unit and the second adsorption unit are the same and there are two or more of each.

[0018] In another advantageous embodiment of the carbon dioxide recovery device according to this application, the first valve, the second valve, the third valve, the fourth valve, the fifth valve, the sixth valve, the seventh valve, and the eighth valve are regulating valves.

[0019] According to this application, it also provides a control method for the above-mentioned carbon dioxide recovery device, the control method comprising: when the first adsorption unit is in adsorption mode and the second adsorption unit is in regeneration mode,

[0020] When the carbon dioxide in the third pipeline does not reach the preset value, the first valve, the third valve, the sixth valve, the eighth valve and the first and second ports of the three-way valve are opened, and the second valve, the fourth valve, the fifth valve, the seventh valve and the third port of the three-way valve are closed.

[0021] The first part of the exhaust gas flows sequentially through the exhaust end, the heat exchanger, the mixer, the first valve, the first adsorption unit, the third valve, and the outlet; simultaneously, the second part of the exhaust gas flows sequentially through the exhaust end, the sixth valve, the second adsorption unit, the eighth valve, the first port of the three-way valve, the second port of the three-way valve, and the mixer.

[0022] When the carbon dioxide in the third pipeline reaches a preset value, the first valve, the third valve, the sixth valve, the eighth valve, and the first and third ports of the three-way valve are opened, and the second valve, the fourth valve, the fifth valve, the seventh valve, and the second port of the three-way valve are closed.

[0023] The first part of the exhaust gas flows sequentially through the exhaust end, the heat exchanger, the mixer, the first valve, the first adsorption unit, the third valve, and the outlet; simultaneously, the second part of the exhaust gas flows sequentially through the exhaust end, the sixth valve, the second adsorption unit, the eighth valve, the first port of the three-way valve, the third port of the three-way valve, and the carbon dioxide recovery tank.

[0024] In another advantageous embodiment of the control method according to this application, the control method includes: when the first adsorption unit is in regeneration mode and the second adsorption unit is in adsorption mode,

[0025] When the carbon dioxide in the third pipeline does not reach the preset value, the first and second ports of the second valve, the fourth valve, the fifth valve, the seventh valve, and the three-way valve are opened, and the first valve, the third valve, the sixth valve, the eighth valve, and the third port of the three-way valve are closed.

[0026] The first part of the exhaust gas flows sequentially through the exhaust end, the heat exchanger, the mixer, the fifth valve, the second adsorption unit, the seventh valve, and the outlet; simultaneously, the second part of the exhaust gas flows sequentially through the exhaust end, the second valve, the first adsorption unit, the fourth valve, the first port of the three-way valve, the second port of the three-way valve, and the mixer.

[0027] When the carbon dioxide in the third pipeline reaches a preset value, the first and third ports of the second, fourth, fifth, and seventh valves and the three-way valve are opened, and the first, third, sixth, and eighth valves and the second port of the three-way valve are closed.

[0028] The first part of the exhaust gas flows sequentially through the exhaust end, the heat exchanger, the mixer, the fifth valve, the second adsorption unit, the seventh valve, and the outlet; simultaneously, the second part of the exhaust gas flows sequentially through the exhaust end, the second valve, the first adsorption unit, the fourth valve, the first port of the three-way valve, the third port of the three-way valve, and the carbon dioxide recovery tank.

[0029] According to this application, it also provides an exhaust gas treatment system, which is equipped with the aforementioned carbon dioxide recovery device and three-way catalytic converter.

[0030] According to this application, it also provides a vehicle equipped with the aforementioned exhaust gas treatment system.

[0031] It is understood that the carbon dioxide recovery device for exhaust gas treatment system according to this application can not only significantly reduce the final carbon dioxide emissions, but also efficiently recover carbon dioxide from vehicle exhaust. Attached Figure Description

[0032] The disclosure of this application will become more readily understood with reference to the accompanying drawings. It will be readily understood by those skilled in the art that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this application. Furthermore, similar numbers in the drawings are used to denote similar components, wherein:

[0033] Figure 1 illustrates, by way of example, a structural schematic diagram of a carbon dioxide recovery device for an exhaust gas treatment system disclosed in this application. Detailed Implementation

[0034] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, specific embodiments of this application will be described in detail below with reference to the accompanying drawings. First, it should be noted that the directional terms such as up, down, left, right, front, back, inner side, outer side, upper part, and bottom mentioned or possibly used in this specification are defined relative to the structures shown in the accompanying drawings. They are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive terms.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0036] Figure 1 shows a schematic structure of a carbon dioxide recovery device for an exhaust gas treatment system disclosed in this application. The exhaust gas treatment system includes an exhaust end 20 for emitting exhaust gases, which is typically connected to the exhaust pipe of an internal combustion engine (not shown). For example, a three-way catalytic converter 11 is installed downstream of the exhaust end 20. The three-way catalytic converter 11 catalyzes harmful gases, such as CO, HC, and NOx from the internal combustion engine, by attaching a precious metal catalyst to a high-density filter screen, causing these harmful gases to react into carbon dioxide, water, and nitrogen, with a high concentration of carbon dioxide. The carbon dioxide recovery device of this application aims to capture and recover the carbon dioxide from this portion of the gas.

[0037] As can be clearly seen from Figure 1, the carbon dioxide recovery device 10 consists of a carbon dioxide recovery tank 100, a first pipeline 200, a second pipeline 300, a first adsorption unit 400, a second adsorption unit 500, a third pipeline 600, and a three-way valve 700. In the carbon dioxide recovery device 10 of this application, the exhaust gas from the exhaust end 20 is split into two streams through the first pipeline 200 and the second pipeline 300. Specifically, the first pipeline 200 is provided with a heat exchanger 210 and a mixer 220 in sequence along the direction of exhaust gas flow, and has a first end 201 and a second end 202, wherein the first end 201 of the first pipeline 200 is connected to the exhaust end 20. The second pipeline 300 has a first end 301 and a second end 302, and the first end 301 of the second pipeline 300 is connected to the exhaust end 20. The first adsorption unit 400 has an inlet and an outlet. The inlet of the first adsorption unit 400 is connected to the second end 202 of the first pipeline 200 through a first valve 401 and to the second end 302 of the second pipeline 300 through a second valve 402. The outlet of the first adsorption unit 400 is connected to the gas outlet through a third valve 403. The second adsorption unit 500 has an inlet and an outlet. The inlet of the second adsorption unit 500 is connected to the second end 202 of the first pipeline 200 through a fifth valve 501 and to the second end 302 of the second pipeline 300 through a sixth valve 502. The outlet of the second adsorption unit 500 is connected to the gas outlet through a seventh valve 503. The third pipeline 600 has a first end 601 and a second end 602. The first end 601 of the third pipeline 600 is connected to the outlet of the first adsorption unit 400 through a fourth valve 404 and to the outlet of the second adsorption unit 500 through an eighth valve 504. The third pipeline 600 is equipped with a carbon dioxide concentration sensor 610 for detecting the carbon dioxide concentration in the third pipeline 600. The three-way valve 700 has a first port 710 for connecting to the second end 602 of the third pipeline 600, a second port 720 for connecting to the mixer 220, and a third port 730 for connecting to the carbon dioxide recovery tank 100.

[0038] Those skilled in the art will readily recognize that, in order to significantly improve the heat exchange efficiency of the heat exchanger, the heat exchanger 210 can adopt a refrigerant-cooling medium heat exchange method, and its specific structure can be designed as a shell-and-tube heat exchanger, a plate-and-fin heat exchanger, a coaxial heat exchanger, or a coil heat exchanger, etc. Furthermore, the cooling medium can be brine, ethylene glycol solution, propylene glycol solution, dichloromethane solution, or trichloroethylene solution, preferably a propylene glycol solution with a concentration of about 30%.

[0039] It should be noted that the first adsorption unit 400 and the second adsorption unit 500 are the core components of the carbon dioxide recovery device 10, and their operating mode and specific structure will affect the carbon dioxide adsorption and desorption efficiency. In the embodiments of the carbon dioxide recovery device of this application, both the first adsorption unit 400 and the second adsorption unit 500 are temperature-switching adsorption beds. Furthermore, the first adsorption unit 400 and the second adsorption unit 500 are filled with a desiccant, which includes one or more of activated carbon, activated alumina, silica gel, carbon molecular sieves, and zeolite molecular sieves. This type of adsorption unit has many advantages such as long lifespan, good stability, slow performance decay, and easy regeneration through physical adsorption. In addition, the number of the first adsorption unit 400 and the second adsorption unit 500 is the same, and there are two or more of each.

[0040] For example, the first valve 401, the second valve 402, the third valve 403, the fourth valve 404, the fifth valve 501, the sixth valve 502, the seventh valve 503, and the eighth valve 504 are regulating valves. The carbon dioxide recovery device 10 also includes a controller (not shown), which communicates with the first valve 401, the second valve 402, the third valve 403, the fourth valve 404, the fifth valve 501, the sixth valve 502, the seventh valve 503, the eighth valve 504, or any combination thereof.

[0041] The aforementioned control method for the carbon dioxide recovery device guides the flow path between the first, second, and third pipelines by controlling the flow direction and on / off state of each valve, allowing the first adsorption unit and the second adsorption unit to operate alternately in adsorption mode and regeneration mode, respectively. An illustrative explanation will follow with reference to Figure 1.

[0042] When the first adsorption unit 400 is operating in adsorption mode and the second adsorption unit 500 is operating in regeneration mode, if the carbon dioxide concentration sensor 610 detects that the carbon dioxide in the third pipeline 600 has not reached a preset value, the first valve 401, the third valve 403, the sixth valve 502, the eighth valve 504, and the first port 710 and the second port 720 of the three-way valve 700 are opened, and the second valve 402, the fourth valve 404, the fifth valve 501, the seventh valve 503, and the third port 730 of the three-way valve 700 are closed. At this time, the first part of the exhaust gas discharged from the exhaust end 20 of the internal combustion engine flows into the heat exchanger 210 through the first pipeline 200 for heat dissipation and cooling, and then undergoes secondary cooling and flow and pressure stabilization through the mixer 220. The exhaust gas, after undergoing secondary cooling, then flows into the first adsorption unit 400 through the first valve 401 for carbon dioxide adsorption. The remaining exhaust gas exits the first adsorption unit 400 through the third valve 403 and is finally discharged into the atmosphere through the outlet. Simultaneously, a second portion of the exhaust gas discharged from the exhaust end 20 of the internal combustion engine flows into the second adsorption unit 500 through the second pipeline 300 and the sixth valve 502. Since the second portion of the exhaust gas entering the second adsorption unit 500 has not undergone cooling treatment and is therefore at a higher temperature, this portion of exhaust gas reduces its adsorption capacity during the purging of the second adsorption unit 500. In other words, the carbon dioxide adsorbed in the second adsorption unit 500 is desorbed during the hot gas purging process and flows out along with the exhaust gas through the eighth valve 504. Subsequently, the exhaust gas containing carbon dioxide flows into the three-way valve 700 through the third pipe 600, flowing from its first port 710 to its second port 720, and finally enters the mixer 220, where it merges with the first portion of the exhaust gas discharged from the exhaust end 20 of the internal combustion engine to form a gas stream. Here, the exhaust gas, cooled by the heat exchanger 210, mixes with the purified and cooled gas stream containing a high concentration of carbon dioxide and is further cooled. Then, this mixed gas stream flows into the first adsorption unit 400 through the first valve 401 for carbon dioxide adsorption.

[0043] When the carbon dioxide concentration sensor 610 detects that the carbon dioxide in the third pipeline 600 has reached a preset value, the first valve 401, the third valve 403, the sixth valve 502, the eighth valve 504, and the first port 710 and the third port 730 of the three-way valve 700 are opened, while the second valve 402, the fourth valve 404, the fifth valve 501, the seventh valve 503, and the second port 720 of the three-way valve 700 are closed. A first portion of the exhaust gas discharged from the exhaust end 20 of the internal combustion engine flows through the first pipeline 200 into the heat exchanger 210 for cooling, and then undergoes secondary cooling and flow and pressure stabilization through the mixer 220. The exhaust gas, after secondary cooling, then flows through the first valve 401 into the first adsorption unit 400 for carbon dioxide adsorption. The remaining exhaust gas leaves the first adsorption unit 400 through the third valve 403 and is finally discharged into the atmosphere through the outlet. Meanwhile, a second portion of the exhaust gas discharged from the exhaust end 20 of the internal combustion engine flows into the second adsorption unit 500 through the second pipeline 300 and the sixth valve 502. As mentioned earlier, since the exhaust gas entering the second adsorption unit 500 is not cooled and therefore has a higher temperature, this portion of exhaust gas can reduce its adsorption capacity during the purging of the second adsorption unit 500. That is, the carbon dioxide adsorbed in the second adsorption unit 500 will be desorbed during the hot gas purging process and will flow out along with the exhaust gas through the eighth valve 504. Since the carbon dioxide concentration sensor 610 detects that the carbon dioxide in the third pipeline 600 has reached a preset value, the carbon dioxide recovery requirements are met. Subsequently, this portion of exhaust gas containing carbon dioxide flows into the three-way valve 700 through the third pipeline 600, flowing from its first port 710 to its third port 730, and finally enters the carbon dioxide recovery tank 100 for storage, so as to facilitate subsequent recycling, for example, converting the carbon dioxide in the carbon dioxide recovery tank 100 into chemical raw materials that can be further used in industrial synthesis processes.

[0044] After the first adsorption unit 400 becomes saturated after a preset time, it needs to switch from adsorption mode to regeneration mode. Simultaneously, the second adsorption unit 500 switches from regeneration mode to adsorption mode. When the first adsorption unit 400 is operating in regeneration mode and the second adsorption unit 500 is operating in adsorption mode, if the carbon dioxide concentration sensor 610 detects that the carbon dioxide in the third pipeline 600 has not reached a preset value, the second valve 402, the fourth valve 404, the fifth valve 501, the seventh valve 503, and the first port 710 and the second port 720 of the three-way valve 700 are opened, while the first valve 401, the third valve 403, the sixth valve 502, the eighth valve 504, and the third port 730 of the three-way valve 700 are closed. At this time, the first portion of the exhaust gas discharged from the exhaust end 20 of the internal combustion engine flows into the heat exchanger 210 through the first pipeline 200 for heat dissipation and cooling, and then undergoes secondary cooling and flow and pressure stabilization through the mixer 220. The exhaust gas, after undergoing secondary cooling, then flows into the second adsorption unit 500 through the fifth valve 501 for carbon dioxide adsorption. The remaining exhaust gas exits the second adsorption unit 500 through the seventh valve 503 and is finally discharged into the atmosphere through the outlet. Simultaneously, a second portion of the exhaust gas discharged from the exhaust end 20 of the internal combustion engine flows into the first adsorption unit 400 through the second pipe 300 and the second valve 402. Since the second portion of the exhaust gas entering the first adsorption unit 400 has not undergone cooling treatment and is therefore at a higher temperature, this portion of exhaust gas reduces its adsorption capacity during the purging of the first adsorption unit 400. In other words, the carbon dioxide adsorbed in the first adsorption unit 400 is desorbed during the hot gas purging process and flows out along with the exhaust gas through the fourth valve 404. Subsequently, the exhaust gas containing carbon dioxide flows into the three-way valve 700 through the third pipe 600, flowing from its first port 710 to its second port 720, and finally enters the mixer 220, where it merges with the first portion of the exhaust gas discharged from the exhaust end 20 of the internal combustion engine to form a single gas stream. Here, the exhaust gas, cooled by the heat exchanger 210, mixes with the purified and cooled gas stream containing a high concentration of carbon dioxide and is further cooled. The mixed gas stream then flows into the second adsorption unit 500 through the fifth valve 501 for carbon dioxide adsorption.

[0045] When the carbon dioxide concentration sensor 610 detects that the carbon dioxide in the third pipeline 600 has reached a preset value, the second valve 402, the fourth valve 404, the fifth valve 501, the seventh valve 503, and the first port 710 and the third port 730 of the three-way valve 700 are opened, while the first valve 401, the third valve 403, the sixth valve 502, the eighth valve 504, and the second port 720 of the three-way valve 700 are closed. At this time, the first part of the exhaust gas discharged from the exhaust end 20 of the internal combustion engine flows into the heat exchanger 210 through the first pipeline 200 for heat dissipation and cooling, and then undergoes secondary cooling and flow and pressure stabilization through the mixer 220. The exhaust gas that has completed secondary cooling then flows into the second adsorption unit 500 through the fifth valve 501 for carbon dioxide adsorption, and the remaining exhaust gas leaves the second adsorption unit 500 through the seventh valve 503, and is finally discharged into the atmosphere through the outlet. Meanwhile, a second portion of the exhaust gas discharged from the exhaust end 20 of the internal combustion engine flows into the first adsorption unit 400 through the second pipe 300 and the second valve 402. As mentioned earlier, since the exhaust gas entering the first adsorption unit 400 in the second portion has not undergone cooling treatment and is therefore at a higher temperature, this portion of exhaust gas can reduce its adsorption capacity during the purging of the first adsorption unit 400. That is, the carbon dioxide adsorbed in the first adsorption unit 400 will be desorbed during the hot gas purging process and will flow out along with the exhaust gas through the fourth valve 404. Since the carbon dioxide concentration sensor 610 detects that the carbon dioxide in the third pipe 600 has reached a preset value, the carbon dioxide recovery requirements are met. Subsequently, this portion of exhaust gas containing carbon dioxide flows into the three-way valve 700 through the third pipe 600, flowing from its first port 710 to its third port 730, and finally enters the carbon dioxide recovery tank 100 for storage, so as to facilitate subsequent recycling, for example, converting the carbon dioxide in the carbon dioxide recovery tank 100 into chemical raw materials that can be further used in industrial synthesis processes.

[0046] In addition, this application also provides an exhaust gas treatment system. The exhaust gas treatment system is equipped with the aforementioned carbon dioxide recovery device 10 and a three-way catalytic converter 11.

[0047] In addition, this application also provides a vehicle equipped with the aforementioned exhaust gas treatment system.

[0048] In summary, the carbon dioxide recovery device of this application uses a refrigerant heat exchanger and a mixer to efficiently recover carbon dioxide from vehicle exhaust, thereby effectively reducing the amount of carbon dioxide emitted into the atmosphere and achieving the goal of green environmental protection.

[0049] The foregoing has provided several specific embodiments to illustrate in detail the carbon dioxide recovery device and its control method for an exhaust gas treatment system, the exhaust gas treatment system equipped with the carbon dioxide recovery device, and the vehicle equipped with the exhaust gas treatment system. These examples are only for illustrating the principles and implementation methods of this application and are not intended to limit the application. Various modifications and improvements can be made by those skilled in the art without departing from the spirit and scope of this application. Therefore, all equivalent technical solutions should fall within the scope of this application and be defined by the claims of this application.

Claims

1. A carbon dioxide recovery device for an exhaust gas treatment system, the exhaust gas treatment system comprising an exhaust end (20) for discharging exhaust gas, characterized in that, The carbon dioxide recovery device (10) includes: a carbon dioxide recovery tank (100); a first pipeline (200) having a heat exchanger (210) and a mixer (220) sequentially arranged along the direction of exhaust gas flow, and having a first end (201) and a second end (202), wherein the first end (201) of the first pipeline (200) is connected to the exhaust end (20); and a second pipeline (300) having a first end (301) and a second end (302), wherein the first end (301) of the second pipeline (300) is connected to the exhaust end. (20) Connected; a first adsorption unit (400) having an inlet and an outlet, the inlet of the first adsorption unit (400) being connected to the second end (202) of the first pipeline (200) via a first valve (401) and to the second end (302) of the second pipeline (300) via a second valve (402), and the outlet of the first adsorption unit (400) being connected to the gas outlet via a third valve (403); a second adsorption unit (500) having an inlet and an outlet, the inlet of the second adsorption unit (5 ... The second adsorption unit (500) is connected to the second end (202) of the first pipeline (200) via a fifth valve (501) and to the second end (302) of the second pipeline (300) via a sixth valve (502), and the outlet of the second adsorption unit (500) is connected to the air outlet via a seventh valve (503); a third pipeline (600) has a first end (601) and a second end (602), the first end (601) of the third pipeline (600) being connected to the outlet of the first adsorption unit (400) via a fourth valve (404) and... The third pipeline (600) is connected to the outlet of the second adsorption unit (500) via the eighth valve (504). The third pipeline (600) is equipped with a carbon dioxide concentration sensor (610) for detecting the carbon dioxide concentration in the third pipeline (600); and a three-way valve (700) having a first port (710) for connecting to the second end (602) of the third pipeline (600), a second port (720) for connecting to the mixer (220), and a third port (730) for connecting to the carbon dioxide recovery tank (100).

2. The carbon dioxide recovery device according to claim 1, characterized in that, The heat exchanger (210) is a refrigerant-cooling agent heat exchanger of any one of the following: shell and tube heat exchanger, plate and fin heat exchanger, coaxial heat exchanger, and coil heat exchanger.

3. The carbon dioxide recovery device according to claim 2, characterized in that, The refrigerant is brine, ethylene glycol solution, propylene glycol solution, dichloromethane solution, or trichloroethylene solution.

4. The carbon dioxide recovery device according to any one of claims 1-3, characterized in that, Both the first adsorption unit (400) and the second adsorption unit (500) are temperature-switching adsorption beds.

5. The carbon dioxide recovery device according to any one of claims 1-3, characterized in that, The first adsorption unit (400) and the second adsorption unit (500) are filled with a desiccant, which includes one or more of activated carbon, activated alumina, silica gel, carbon molecular sieve and zeolite molecular sieve.

6. The carbon dioxide recovery device according to any one of claims 1-3, characterized in that, The number of the first adsorption unit (400) and the second adsorption unit (500) is the same, and there are two or more of each.

7. The carbon dioxide recovery device according to any one of claims 1-3, characterized in that, The first valve (401), the second valve (402), the third valve (403), the fourth valve (404), the fifth valve (501), the sixth valve (502), the seventh valve (503), and the eighth valve (504) are regulating valves.

8. A control method for a carbon dioxide recovery device according to any one of claims 1-7, characterized in that, The control method includes: when the first adsorption unit (400) is in adsorption mode and the second adsorption unit (500) is in regeneration mode, when the carbon dioxide in the third pipeline (600) does not reach a preset value, opening the first valve (401), the third valve (403), the sixth valve (502), the eighth valve (504), and the first port (710) and the second port (720) of the three-way valve (700), and closing the second valve (402), the fourth valve (404), the fifth valve (501), and the seventh valve (700). 503) and the third port (730) of the three-way valve (700); so that the first part of the exhaust gas flows sequentially through the exhaust end (20), the heat exchanger (210), the mixer (220), the first valve (401), the first adsorption unit (400), the third valve (403) and the outlet; at the same time, so that the second part of the exhaust gas flows sequentially through the exhaust end (20), the sixth valve (502), the second adsorption unit (500), the eighth valve (504), the first port (710) of the three-way valve (700), the three-way valve ( The second port (720) of the 700 and the mixer (220); when the carbon dioxide in the third pipeline (600) reaches a preset value, the first valve (401), the third valve (403), the sixth valve (502), the eighth valve (504) and the first port (710) and the third port (730) of the three-way valve (700) are opened, and the second valve (402), the fourth valve (404), the fifth valve (501), the seventh valve (503) and the second port (720) of the three-way valve (700) are closed; so that the exhaust gas... The first part flows sequentially through the exhaust end (20), the heat exchanger (210), the mixer (220), the first valve (401), the first adsorption unit (400), the third valve (403), and the outlet; at the same time, the second part of the exhaust gas flows sequentially through the exhaust end (20), the sixth valve (502), the second adsorption unit (500), the eighth valve (504), the first port (710) of the three-way valve (700), the third port (730) of the three-way valve (700), and the carbon dioxide recovery tank (100).

9. The control method according to claim 8, characterized in that, The control method includes: when the first adsorption unit (400) is in regeneration mode and the second adsorption unit (500) is in adsorption mode, and when the carbon dioxide in the third pipeline (600) does not reach a preset value, opening the second valve (402), the fourth valve (404), the fifth valve (501), the seventh valve (503), and the first port (710) and the second port (720) of the three-way valve (700), and closing the first valve (401), the third valve (403), the sixth valve (502), and the eighth valve (700). 504) and the third port (730) of the three-way valve (700); so that the first part of the exhaust gas flows sequentially through the exhaust end (20), the heat exchanger (210), the mixer (220), the fifth valve (501), the second adsorption unit (500), the seventh valve (503) and the outlet; at the same time, so that the second part of the exhaust gas flows sequentially through the exhaust end (20), the second valve (402), the first adsorption unit (400), the fourth valve (404), the first port (710) of the three-way valve (700), the three-way valve (704) and the third port (730) of the three-way valve (700); so that the first part of the exhaust gas flows sequentially through the exhaust end (20), the second valve (402), the first adsorption unit (400), the fourth valve (404), the first port (710) of the three-way valve (700), the third port (730) of the three-way valve (70 ... The second port (720) of the 700 and the mixer (220); when the carbon dioxide in the third pipeline (600) reaches a preset value, the second valve (402), the fourth valve (404), the fifth valve (501), the seventh valve (503) and the first port (710) and the third port (730) of the three-way valve (700) are opened, and the first valve (401), the third valve (403), the sixth valve (502), the eighth valve (504) and the second port (720) of the three-way valve (700) are closed; so that the exhaust gas... The first part flows sequentially through the exhaust end (20), the heat exchanger (210), the mixer (220), the fifth valve (501), the second adsorption unit (500), the seventh valve (503), and the outlet; at the same time, the second part of the exhaust gas flows sequentially through the exhaust end (20), the second valve (402), the first adsorption unit (400), the fourth valve (404), the first port (710) of the three-way valve (700), the third port (730) of the three-way valve (700), and the carbon dioxide recovery tank (100).

10. An exhaust gas treatment system, characterized in that, The exhaust gas treatment system is provided with a carbon dioxide recovery device (10) according to any one of claims 1-7 and a three-way catalytic converter (11).

11. A vehicle, characterized in that, The vehicle is equipped with the exhaust gas treatment system according to claim 10.

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