Carbon dioxide separation device

Abstract

To provide a carbon dioxide separation device which can effectively adsorb carbon dioxide.SOLUTION: A carbon dioxide separation device 10 includes: a dewatering part 30; a carbon dioxide adsorption part 40; and a drainage structure 50. The dewatering part 30 is configured to remove water contained in exhaust gas flowing from a heat exchanger 20. The carbon dioxide adsorption part 40 is configured to adsorb carbon dioxide contained in the exhaust gas that has passed through the dewatering part 30. In a flow path of the exhaust gas between the heat exchanger 20 and the dewatering part 30, the drainage structure 50 is provided to suppress the inflow of water condensed from the exhaust gas into the dewatering part 30 through the flow path.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a carbon dioxide separation device. [Background technology]

[0002] A carbon dioxide separation device that separates carbon dioxide from exhaust gas is already known (see, for example, Patent Document 1). The carbon dioxide separation device is provided, for example, in the exhaust system of an internal combustion engine. The carbon dioxide separation device includes a water adsorption section that adsorbs water contained in the exhaust gas flowing in from the internal combustion engine, and a carbon dioxide adsorption section that adsorbs carbon dioxide contained in the exhaust gas flowing in from the water adsorption section.

[0003] The carbon dioxide adsorption section uses a carbon dioxide adsorbent such as lithium composite oxide or zeolite. The carbon dioxide adsorbent has the property that the amount of carbon dioxide adsorbed is significantly reduced when there is a large amount of water in the atmosphere. For this reason, a dehydration process is performed on the exhaust gas in the water adsorption section. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2022-152289 A Summary of the Invention [Problem to be solved by the invention]

[0005] When dehydrating exhaust gas using an adsorbent, the more water that flows into the water adsorption section, the more adsorbent the section needs to be equipped with to adsorb the water. In other words, the more water that flows into the dehydration section, the higher the dehydration capacity that the dehydration section needs to have.

[0006] Therefore, according to one aspect of the present disclosure, it is desirable to provide a carbon dioxide separation device that can reduce the dehydration capacity required for exhaust gas and effectively adsorb carbon dioxide. [Means for solving the problem]

[0007] According to one aspect of the present disclosure, there is provided a carbon dioxide separation apparatus comprising a dehydration section, a carbon dioxide adsorption section, and a drainage structure. The dehydration unit is connected to the heat exchanger. The heat exchanger is configured to cool the exhaust gas discharged from the internal combustion engine. The dehydration unit is configured to remove moisture contained in the exhaust gas flowing from the heat exchanger.

[0008] The carbon dioxide adsorption section is configured to adsorb carbon dioxide contained in the exhaust gas that has passed through the dehydration section. The drainage structure is provided in a flow path of the exhaust gas between the heat exchanger and the dehydration section. The drainage structure is provided to suppress water condensed from the exhaust gas from flowing through the flow path into the dehydration section.

[0009] By providing the drainage structure in the exhaust gas flow path between the heat exchanger and the dehydration section, the amount of water flowing into the dehydration section can be reduced. Therefore, the carbon dioxide separation device described above can reduce the dehydration capacity required for the exhaust gas and effectively adsorb carbon dioxide.

[0010] According to one aspect of the present disclosure, the carbon dioxide adsorption section can include zeolite as a carbon dioxide adsorbent. Zeolite has the property of adsorbing not only carbon dioxide but also water. By providing the above-mentioned drainage structure in a carbon dioxide separation device including an adsorbent having such a property, it is possible to effectively suppress the carbon dioxide adsorption capacity of the carbon dioxide adsorption section from being reduced by water.

[0011] According to one aspect of the present disclosure, the carbon dioxide separation device may be mounted on a vehicle equipped with an internal combustion engine. Since the required dehydration capacity can be reduced, the carbon dioxide separation device can be made smaller. A carbon dioxide separation device that is small and has a high carbon dioxide absorption capacity is suitable for mounting on a vehicle.

[0012] According to one aspect of the present disclosure, the drainage structure may include a recessed structure. The recessed structure may be configured to collect water condensed from the exhaust gas. The drainage structure may include a drainage hole. The drainage hole may be configured to drain the water collected by the recessed structure. By providing the recessed structure, the inflow of water into the dehydration unit can be effectively suppressed. [Brief description of the drawings]

[0013] [Figure 1] FIG. 2 is a diagram illustrating a configuration of a carbon dioxide separation device in the first embodiment. [Diagram 2] 2A and 2B are diagrams illustrating the layout of a carbon dioxide separator. [Diagram 3] 4 is a flowchart showing a valve control process executed by a controller. [Figure 4] 4 is a graph showing the amount of water remaining in an exhaust gas flow path. [Diagram 5] FIG. 11 is a diagram showing a configuration of a drainage structure in a second embodiment. [Figure 6] FIG. 11 is a diagram showing a configuration of a drainage structure in a third embodiment. [Figure 7] FIG. 2 is a diagram illustrating an example in which a portion of exhaust gas flows into a carbon dioxide separation device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Exemplary embodiments of the present disclosure will now be described with reference to the drawings. [First embodiment] The carbon dioxide separation device 10 of this embodiment is mounted on a vehicle 1 as shown in Fig. 1. Examples of the vehicle 1 include two-wheeled and four-wheeled automobiles.

[0015] The vehicle 1 includes an internal combustion engine 2. In the internal combustion engine 2, high-temperature combustion gas is generated by burning a mixture of fuel and air. This high-temperature combustion gas is discharged as exhaust gas into an exhaust passage C0. The carbon dioxide separation device 10 is connected to an exhaust passage C1 through which exhaust gas from the exhaust passage C0 passes. The exhaust passages C0, C1, C2, C3, and C4 shown in FIG. 1 are hollow structures that form a flow path of the exhaust gas, and are formed, for example, by conduits for guiding the exhaust gas to an exhaust port (not shown).

[0016] When the vehicle 1 is a gasoline-powered vehicle, a catalyst 3, a filter 4, and a muffler 5 are arranged in a flow path of exhaust gas between the internal combustion engine 2 and the carbon dioxide separator 10, as shown in Fig. 2A for example. In this case, the exhaust passage C1 may be an exhaust passage communicating with the muffler 5. The carbon dioxide separator 10 is configured to separate carbon dioxide contained in the exhaust gas that flows in from the internal combustion engine 2 through, for example, the catalyst 3, the filter 4, and the muffler 5, from the exhaust gas.

[0017] When the vehicle 1 is a diesel vehicle, a catalyst 6A, a filter 7, an SCR (Selective Catalytic Reduction) 8, a catalyst 6B, and a muffler 9 are arranged in a flow path of exhaust gas between the internal combustion engine 2 and the carbon dioxide separator 10, as shown in Fig. 2B for example. In this case, the exhaust passage C1 may be an exhaust passage communicating with the muffler 9. The carbon dioxide separator 10 is configured to separate carbon dioxide contained in the exhaust gas flowing in from the internal combustion engine 2 through, for example, the catalyst 6A, the filter 7, the SCR 8, the catalyst 6B, and the muffler 9, from the exhaust gas.

[0018] 1, the carbon dioxide separation device 10 includes a heat exchanger 20, a water adsorber 30, and a carbon dioxide adsorber 40. The heat exchanger 20 is connected to an exhaust passage C1 through which exhaust gas from the internal combustion engine 2 flows.

[0019] The water adsorber 30 is connected to the heat exchanger 20 through an exhaust passage C2. The carbon dioxide adsorber 40 is connected to the water adsorber 30 through an exhaust passage C3. An outlet of the carbon dioxide adsorber 40 is connected to an exhaust passage C4 which is directly or indirectly connected to an exhaust port for discharging exhaust gas to the outside of the vehicle 1.

[0020] The heat exchanger 20 is configured to cool the exhaust gas flowing in from the internal combustion engine 2 through the exhaust passage C1. The high-temperature exhaust gas from the internal combustion engine 2 is cooled by the heat exchanger 20 to a temperature suitable for carbon dioxide adsorption in the carbon dioxide adsorber 40. The cooled low-temperature exhaust gas is sent to the water adsorber 30 through the exhaust passage C2.

[0021] The water adsorber 30 functions as a dehydration unit. The water adsorber 30 is configured to remove moisture contained in the low-temperature exhaust gas flowing from the heat exchanger 20 through the exhaust passage C2. The water adsorber 30 includes a water adsorbent 35 for adsorbing moisture contained in the exhaust gas.

[0022] For example, the water adsorbent 35 is filled in the water adsorber 30 so as to fill approximately the entire cross section perpendicular to the exhaust gas flow direction in the exhaust gas flow path. Examples of the water adsorbent 35 include zeolite and alumina as solid adsorbents. The water adsorbent 35 may be composed of a single type of water adsorbent or a combination of multiple types of water adsorbents.

[0023] The carbon dioxide adsorber 40 is configured to remove carbon dioxide from the exhaust gas flowing in from the water adsorber 30 through the exhaust passage C3, i.e., from the exhaust gas that has passed through the water adsorbent 35. The carbon dioxide adsorber 40 includes a carbon dioxide adsorbent 45 for adsorbing carbon dioxide contained in the exhaust gas.

[0024] For example, the carbon dioxide adsorbent 45 is packed in the carbon dioxide adsorber 40 so as to fill approximately the entire cross section perpendicular to the exhaust gas flow direction in the exhaust gas flow path. Examples of the carbon dioxide adsorbent 45 include zeolite, activated carbon, and metal organic frameworks (MOFs) as solid adsorbents. Zeolites and the like are porous materials and have a high surface area.

[0025] The carbon dioxide separation device 10 further includes a drainage structure 50 in an exhaust passage C2 that constitutes a flow path of the exhaust gas between the heat exchanger 20 and the water adsorber 30.

[0026] When the exhaust gas temperature is lowered, some of the water vapor contained in the exhaust gas condenses. This condensation causes some of the water vapor contained in the exhaust gas to turn into liquid. That is, liquid water condensed from the exhaust gas adheres to the inner wall of the exhaust passage C2 and moves in the direction of the exhaust gas flow.

[0027] The drainage structure 50 is provided to suppress water condensed from the exhaust gas from flowing through the exhaust passage C2 into the water adsorber 30. Specifically, the drainage structure 50 includes a storage structure 51, a drainage hole 53, and a valve 55. FIG. 1 shows a schematic cross-sectional shape of the drainage structure 50.

[0028] The storage structure 51 is configured to store water condensed from the exhaust gas. The water condensed from the exhaust gas falls by gravity to the lower side of the inner wall of the exhaust passage C2, i.e., to the bottom of the exhaust passage C2, and flows along the bottom toward the water adsorber 30. Here, "downward" refers to the direction in which gravity acts.

[0029] The exhaust passage C2 is disposed so that its bottom is horizontal from the heat exchanger 20 toward the water adsorber 30. Alternatively, the water adsorber 30 is disposed at a position lower than the heat exchanger 20, and the exhaust passage C2 is disposed obliquely so that its bottom forms a downward slope from the heat exchanger 20 toward the water adsorber 30.

[0030] The storage structure 51 is provided at the bottom of the exhaust passage C2, which is the main passage of water. The storage structure 51 corresponds to a recessed structure formed on the inner wall of the exhaust passage C2. The storage structure 51 has a bottom at a position lower than the surroundings in the exhaust passage C2 for collecting water from the surroundings and storing the water. The storage structure 51 is configured such that the bottom is inclined toward the lowest part for collecting water.

[0031] A drain hole 53 is provided at the bottom of the storage structure 51 for discharging water collected and stored by the storage structure 51. The drain hole 53 includes a bottom hole 53A for draining water provided at the bottom of the storage structure 51 and a hollow drain pipe 53B extending downward from the bottom hole 53A. The bottom hole 53A is provided at the lowest part of the storage structure 51.

[0032] The drain pipe 53B is installed so that a second end opposite to the first end connected to the bottom hole 53A is connected to the outside of the vehicle 1, thereby allowing water falling from the bottom hole 53A to be discharged to the outside of the vehicle 1.

[0033] Valve 55 is provided at the upper part of drain pipe 53B, and is configured to be able to change the flow rate of water flowing below valve 55 through drain hole 53. Valve 55 is configured as an electric valve driven by, for example, an electric motor, and is configured to open and close drain hole 53 in accordance with a control signal from controller 70 provided in vehicle 1.

[0034] When valve 55 is in a closed state, the flow path below valve 55 in drain hole 53 is blocked by valve 55. This prevents water from flowing to the outside from drain hole 53, and water is stored in storage structure 51.

[0035] When the valve 55 is open, the flow path below the valve 55 is opened in the drain hole 53. As a result, the water collected and accumulated in the storage structure 51 is discharged to the outside through the drain hole 53.

[0036] The controller 70 is provided in the vehicle 1 to control the valve 55 of the carbon dioxide separation device 10. According to another example, an electronic control unit (ECU) provided for vehicle control separate from valve control functions as the controller 70.

[0037] The controller 70 includes a processor 71 and a memory 73. The memory 73 stores a computer program for causing the processor 71 to execute the valve control process shown in Fig. 3. The processor 71 repeatedly executes the valve control process shown in Fig. 3 to control the valve 55 so as to maintain the valve 55 in a closed state when exhaust gas is being generated in the internal combustion engine 2.

[0038] In the valve control process, the processor 71 maintains the valve 55 in a closed state until the internal combustion engine 2 is stopped (S110, S120). This is because when the internal combustion engine 2 is not stopped, that is, when the internal combustion engine 2 is operating, exhaust gas generated in the internal combustion engine 2 may flow out from the drain hole 53. For example, the processor 71 can determine whether the internal combustion engine 2 is operating / stopped by receiving an input of an on / off signal of an ignition switch.

[0039] When the processor 71 determines that the internal combustion engine 2 has stopped (Yes in S120), it controls the valve 55 to keep the valve 55 open until a predetermined condition is satisfied (S130, S140). As a result, the water stored in the storage structure 51 is discharged to the outside through the drain hole 53.

[0040] The processor 71 may keep the valve 55 open until the internal combustion engine 2 starts to operate. Alternatively, the processor 71 may keep the valve 55 open until a predetermined time has elapsed. The predetermined time may be a pre-estimated time required for all the water stored in the storage structure 51 to flow out.

[0041] When the processor 71 determines that the predetermined condition is satisfied (Yes in S140), it controls the valve 55 to switch the valve 55 to a closed state (S150). This closes the drain hole 53. The processor 71 repeatedly executes such processing to control the drain timing so as to suppress the outflow of exhaust gas.

[0042] Fig. 4 conceptually shows, in the form of a graph, the change in the amount of remaining water in the exhaust gas flow path from the internal combustion engine 2 to the water adsorber 30. The vertical axis of the graph in Fig. 4 represents the amount of remaining water, and the horizontal axis represents the position on the exhaust gas flow path.

[0043] Position P1 shown in the graph corresponds to the connection point between the internal combustion engine 2 and the exhaust passage C0. Position P2 corresponds to the connection point between the heat exchanger 20 and the exhaust passage C2. Position P3 corresponds to the point where the drainage structure 50 is installed. Position P4 corresponds to the connection point between the exhaust passage C2 and the water adsorber 30.

[0044] As described above, the water vapor contained in the exhaust gas condenses as the temperature drops and separates from the exhaust gas as liquid water. Since the exhaust gas is forcibly cooled by the heat exchanger 20, at position P2, the amount of water vapor flowing through the exhaust passage C2 decreases compared to position P1, and instead the amount of liquid water increases.

[0045] In the past, in the absence of the drainage structure 50, liquid water moved together with water vapor up to position P4 and flowed into the water adsorber 30. In contrast, in this embodiment, the presence of the drainage structure 50 allows most of the liquid water to be removed at position P3. Most of the water that reaches position P4 is water vapor contained in the exhaust gas.

[0046] Therefore, according to this embodiment, the amount of water that must be adsorbed by the water adsorber 30 can be greatly reduced as compared with the case without the drainage structure 50. In other words, the water adsorption capacity required for the water adsorber 30 can be greatly reduced.

[0047] The water adsorption capacity of the water adsorber 30 is related to the amount of adsorbent. A reduction in the required adsorption capacity allows a reduction in the amount of adsorbent required in the water adsorber 30, allowing the water adsorber 30 to be made smaller and lighter.

[0048] Therefore, according to this embodiment, it is possible to provide a small-sized and lightweight carbon dioxide separator 10 that can effectively adsorb carbon dioxide while suppressing the dehydration capacity required for exhaust gas.

[0049] [Second embodiment] Next, a carbon dioxide separation apparatus 10 of a second embodiment will be described. However, the carbon dioxide separation apparatus 10 of the second embodiment differs from the first embodiment only in the drainage structure 80. The configuration of the carbon dioxide separation apparatus 10 of the second embodiment other than the drainage structure 80 is substantially the same as that of the first embodiment. Therefore, hereinafter, the configuration of the drainage structure 80 will be selectively described with reference to FIG. 5.

[0050] The carbon dioxide separation device 10 of the second embodiment includes a drainage structure 80 at a position adjacent to the water adsorber 30 in the exhaust passage C2 between the heat exchanger 20 and the water adsorber 30.

[0051] The water adsorber 30 includes a water adsorbent 35 in a housing 31 that defines a flow path of the exhaust gas. The water adsorbent 35 is filled in the housing 31 so as to fill approximately the entire cross section perpendicular to the flow direction of the exhaust gas.

[0052] The drainage structure 80 includes a storage structure 81, a drainage hole 83, and a valve 85 as components for preventing water condensed from exhaust gas from flowing into the water adsorber 30. Figure 5 shows a schematic cross-sectional shape of the drainage structure 80 and the water adsorber 30.

[0053] The storage structure 81 is provided below the inner wall of the exhaust passage C2, i.e., at the bottom of the exhaust passage C2, at the connection point between the housing 31 of the water adsorber 30 and the exhaust passage C2, and forms a water storage space separated from the accommodation space for the water adsorbent 35 inside the housing 31. The storage space corresponds to the space surrounded by the inner wall recessed below the exhaust passage C2 and the outer wall of the housing 31.

[0054] The storage space is provided below the exhaust gas inlet 33 of the water adsorber 30. Therefore, when water condensed from the exhaust gas moves toward the water adsorber 30 through the exhaust passage C2, the water does not reach the water adsorber 30 and is stored in the storage structure 81.

[0055] The drain hole 83 includes a bottom hole 83A for draining water provided in the bottom of the storage structure 81 in order to drain water stored in the storage structure 81, and a hollow drain pipe 83B extending downward from the bottom hole 83A.

[0056] The storage structure 81 is configured such that the bottom is inclined toward the lowest part in order to collect water. The bottom hole 83A is provided in the lowest part of the storage structure 81. The drain pipe 83B is configured to be able to discharge water that falls from the bottom hole 83A to the outside of the vehicle 1, similar to the drain pipe 53B.

[0057] Valve 85 is provided in drain pipe 83B, and is configured to be able to change the flow rate of water flowing below valve 85 through drain hole 83. Valve 85, like valve 55, is configured as an electric valve, and is controlled to open and close by controller 70 provided in vehicle 1.

[0058] According to this embodiment, the drainage structure 80 is located very close to the water adsorbent 35 in the flow path of the exhaust gas until the exhaust gas reaches the water adsorbent 35. Therefore, most of the water separated from the exhaust gas before it reaches the water adsorbent 35, including the water condensed near the water adsorbent 35, can be drained.

[0059] Therefore, according to this embodiment, the water adsorber 30 can be made small and lightweight, and a carbon dioxide separation device 10 that is particularly suitable for mounting on a vehicle can be provided.

[0060] [Third embodiment] Next, a carbon dioxide separation apparatus 10 of a third embodiment will be described. However, the carbon dioxide separation apparatus 10 of the third embodiment differs from the first embodiment only in the drainage structure 90. The configuration of the carbon dioxide separation apparatus 10 of the third embodiment other than the drainage structure 90 is substantially the same as that of the first embodiment. Therefore, hereinafter, the configuration of the drainage structure 90 will be selectively described with reference to FIG. 6.

[0061] The carbon dioxide separation device 10 of the third embodiment is provided with a drainage structure 90 at the bottom of the exhaust passage C2 between the heat exchanger 20 and the water adsorber 30. The drainage structure 90 includes a recess structure 91, a drainage hole 93, and a tank 98. FIG. 6 shows a schematic cross-sectional shape of the drainage structure 90.

[0062] The recess structure 91 is configured similarly to the storage structure 51 of the first embodiment. Similarly to the drain hole 53 of the first embodiment, the drain hole 93 also includes a bottom hole 93A for draining water provided at the bottom of the recess structure 91 and a drain pipe 93B.

[0063] However, in this embodiment, there is no valve in the drain pipe 93B. The drain pipe 93B is arranged so that its end is immersed in the tank 98 filled with water. Specifically, the drain pipe 93B is arranged so that a second end opposite to the first end connected to the recessed structure 91 of the drain pipe 93B is located below the water level of the tank 98. With this arrangement, the second end of the drain pipe 93B is blocked by water to prevent exhaust gas from flowing out.

[0064] Water condensed from the exhaust gas flows into the recessed structure 91 having a bottom lower than the surrounding area while moving through the exhaust passage C2. The water that flows into the recessed structure 91 falls into the tank 98 through the bottom hole 93A and the drain pipe 93B.

[0065] Tank 98 is positioned so that when it is completely filled with water, the water level is located below the first end of drain pipe 93B. Therefore, when the amount of water in tank 98 increases due to water dropping into tank 98, the water overflows from tank 98 without the water level in drain pipe 93B reaching the first end.

[0066] Thus, according to the drainage structure 90 of the present embodiment, the water collected in the recess structure 91 can be discharged to the outside as water overflowing from the tank 98. This drainage structure 90 is advantageous in that it can discharge the water collected in the recess structure 91 to the outside while suppressing the outflow of exhaust gas without using a valve.

[0067] [Other embodiments] The present disclosure is not limited to the above-described embodiment, and can adopt various aspects. For example, the technology of the present disclosure is not limited to application to the vehicle-mounted carbon dioxide separation device 10. For example, the technology of the present disclosure may be applied to a carbon dioxide separation device that is installed in an ordinary home, an office, a factory, or the like and treats exhaust gas from a combustion device or an incineration device. The drainage structure 50, 80 does not need to include the valve 55, 85.

[0068] The carbon dioxide separation apparatus 10 may be provided with a filter that removes moisture from the exhaust gas using a separation membrane as the dehydration section, instead of the water adsorber 30. The separation membrane may be made of a membrane material that allows the exhaust gas to pass through but does not allow the moisture contained therein to pass through. When the amount of water flowing into the separation membrane is related to the dehydration capacity of the filter, the size and installation costs of the filter can be reduced by applying the technology of the present disclosure.

[0069] The carbon dioxide adsorber 40 may be configured as a carbon dioxide absorption unit that absorbs carbon dioxide from the exhaust gas by chemical absorption. In this case, the carbon dioxide absorption unit can separate carbon dioxide from the exhaust gas by using a liquid material such as an amine solution as a carbon dioxide absorbent. In other words, the term "adsorption" in this specification may be understood to include "absorption".

[0070] 2A and 2B, the carbon dioxide separator 10 may be arranged to treat exhaust gas flowing in directly or indirectly from the internal combustion engine 2. As shown in Fig. 7, the carbon dioxide separator 10 may be arranged so that only a portion of the exhaust gas from the internal combustion engine 2 that is branched off, for example, through a valve or a separation membrane, flows into the carbon dioxide separator 10. In this case, the carbon dioxide separator 10 may function to separate carbon dioxide from a portion of the exhaust gas generated in the internal combustion engine 2.

[0071] The function of one component in the above embodiments may be distributed among multiple components. The functions of multiple components may be integrated into one component. Part of the configuration of the above embodiments may be omitted. At least part of the configuration of the above embodiments may be added to or substituted for the configuration of another embodiment. All aspects included in the technical idea identified from the wording of the claims are embodiments of the present disclosure.

[0072] [Technical idea disclosed in this specification] It can be understood that the present specification discloses the following technical ideas. [Item 1] A dehydration unit connected to a heat exchanger configured to cool exhaust gas discharged from an internal combustion engine and configured to remove moisture contained in the exhaust gas flowing from the heat exchanger; a carbon dioxide adsorption section configured to adsorb carbon dioxide contained in the exhaust gas that has passed through the dehydration section; a drainage structure provided in a flow path of the exhaust gas between the heat exchanger and the dehydration unit, for suppressing water condensed from the exhaust gas from flowing through the flow path into the dehydration unit; A carbon dioxide separation device comprising: [Item 2] 2. The carbon dioxide separation apparatus according to item 1, wherein the carbon dioxide adsorption section comprises zeolite as an adsorbent for the carbon dioxide. [Item 3] 3. The carbon dioxide separation device according to item 1 or 2, which is mounted on a vehicle equipped with the internal combustion engine. [Item 4] The drainage structure is a well structure configured to collect water condensed from the exhaust gas; a drain hole configured to drain water collected by the recessed structure; 4. The carbon dioxide separator according to any one of items 1 to 3, comprising: [Item 5] 5. The carbon dioxide separator according to item 4, wherein the drain hole is provided with a valve for controlling drain timing. [Explanation of symbols]

[0073] 1...vehicle, 2...internal combustion engine, 10...carbon dioxide separation device, 20...heat exchanger, 30...water adsorber, 31...casing, 33...inlet, 35...water adsorbent, 40...carbon dioxide adsorber, 45...carbon dioxide adsorbent, 50, 80, 90...drainage structure, 51, 81...storage structure, 53, 83, 93...drainage hole, 53A, 83A, 93A...bottom hole, 53B, 83B, 93B...drainage pipe, 55, 85...valve, 70...controller, 71...processor, 73...memory, 91...recess structure, 98...tank, C0, C1, C2, C3, C4...exhaust passage.

Claims

1. A dehydration unit connected to a heat exchanger configured to cool exhaust gas discharged from an internal combustion engine and configured to remove moisture contained in the exhaust gas flowing from the heat exchanger; a carbon dioxide adsorption section configured to adsorb carbon dioxide contained in the exhaust gas that has passed through the dehydration section; a drainage structure provided in a flow path of the exhaust gas between the heat exchanger and the dehydration unit, for suppressing water condensed from the exhaust gas from flowing through the flow path into the dehydration unit; A carbon dioxide separation device comprising:

2. The carbon dioxide separator according to claim 1 , wherein the carbon dioxide adsorption section comprises zeolite as an adsorbent for the carbon dioxide.

3. The carbon dioxide separation device according to claim 1 , which is mounted on a vehicle having the internal combustion engine.

4. The drainage structure is a well structure configured to collect water condensed from the exhaust gas; a drain hole configured to drain water collected by the recessed structure; The carbon dioxide separation device according to claim 1 .

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