Carbon dioxide separation device

Abstract

The invention provides a carbon dioxide separation device. This carbon dioxide separation device is provided with a dehydration unit, a carbon dioxide collection unit, and a drainage structure. The dehydration part is configured to remove moisture contained in the exhaust gas flowing into the dehydration part from the heat exchanger. The carbon dioxide collection unit is configured to adsorb and / or absorb carbon dioxide contained in the exhaust gas that has passed through the dehydration unit. The drainage structure is provided in a flow path of the exhaust gas between the heat exchanger and the dehydration unit, and suppresses water condensed from the exhaust gas from flowing into the dehydration unit along the flow path.

Description

Technical Field

[0001] The present disclosure relates to a carbon dioxide separation apparatus. Background Art

[0002] A carbon dioxide separation device for separating carbon dioxide from exhaust gas is known (for example, refer to Japanese Patent Publication No. 2022-152289). The carbon dioxide separation device is provided in, for example, an exhaust system of an internal combustion engine. The carbon dioxide separation device includes a water adsorption unit and a carbon dioxide adsorption unit. The water adsorption unit is configured to adsorb water contained in the exhaust gas flowing from the internal combustion engine into the water adsorption unit. The carbon dioxide adsorption unit is configured to adsorb carbon dioxide contained in the exhaust gas flowing from the water adsorption unit.

[0003] In the carbon dioxide adsorption unit, lithium composite oxide, zeolite, etc. are used as carbon dioxide adsorbents. The carbon dioxide adsorbent has the characteristic that the amount of carbon dioxide adsorbed will be significantly reduced when the atmosphere contains a large amount of water. Therefore, the exhaust gas is dehydrated in the water adsorption unit. Summary of the invention

[0004] When using an adsorbent to remove water from the exhaust gas, the more water that flows into the water adsorption unit, the more adsorbent the water adsorption unit needs to be loaded with to adsorb the water. In other words, the more water that flows into the dehydration unit, the higher the dehydration capacity required of the dehydration unit.

[0005] Here, according to one aspect of the present disclosure, it is preferable to provide a carbon dioxide separation device that can reduce the dehydration capacity required when dehydrating exhaust gas and can effectively adsorb carbon dioxide.

[0006] According to one aspect of the present disclosure, a carbon dioxide separation device is provided. The carbon dioxide separation device includes a dehydration unit, a carbon dioxide collection unit, and a drainage structure.

[0007] The dehydration unit is connected to a heat exchanger. The heat exchanger is configured to cool exhaust gas discharged from the internal combustion engine. The dehydration unit is configured to remove water contained in the exhaust gas flowing into the dehydration unit from the heat exchanger.

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

[0009] By providing a drainage structure in the exhaust gas flow path between the heat exchanger and the dehydration unit, the amount of water flowing into the dehydration unit can be reduced. Therefore, according to the above-mentioned carbon dioxide separation device, the dehydration capacity required for dehydrating the exhaust gas can be reduced, and carbon dioxide can be effectively adsorbed and / or absorbed.

[0010] According to one embodiment of the present disclosure, the carbon dioxide collection unit may 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 the above-mentioned properties, it is possible to effectively suppress the reduction of the carbon dioxide adsorption capacity of the carbon dioxide collection unit due to water.

[0011] According to one embodiment of the present disclosure, a carbon dioxide separation device can be installed in a vehicle equipped with an internal combustion engine. Since the required dehydration capacity can be reduced, the carbon dioxide separation device can be miniaturized. A small carbon dioxide separation device with a high carbon dioxide absorption capacity is suitable for installation in a vehicle.

[0012] According to one embodiment 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 discharge the water collected by the recessed structure. By providing the recessed structure, it is possible to effectively suppress water from flowing into the dehydration unit.

[0013] According to one aspect of the present disclosure, the drain hole may include a valve for controlling the drain time. In the carbon dioxide separation device including the valve, the drain can be discharged at an appropriate timing by controlling the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a diagram showing the configuration of the carbon dioxide separation device in the first embodiment.

[0015] Figure 2A and Figure 2B It is a diagram illustrating the configuration of a carbon dioxide separation device.

[0016] Figure 3 is a flowchart showing a valve control process executed by the controller.

[0017] Figure 4 It is a diagram showing the amount of residual water in the exhaust gas flow path.

[0018] Figure 5 It is a figure which shows the structure of the drainage structure in the second embodiment.

[0019] Figure 6 It is a figure which shows the structure of the drainage structure in the third embodiment.

[0020] Figure 7 This is a diagram for explaining an example in which a part of the exhaust gas flows into the carbon dioxide separation device. DETAILED DESCRIPTION

[0021] Exemplary embodiments of the present disclosure are described below with reference to the accompanying drawings.

[0022] [First embodiment]

[0023] like Figure 1 As shown, the carbon dioxide separation device 10 of the present embodiment is installed in a vehicle 1. Examples of the vehicle 1 include a two-wheeled vehicle and a four-wheeled vehicle.

[0024] The vehicle 1 includes an internal combustion engine 2. In the internal combustion engine 2, a mixture of fuel and air is burned to generate high-temperature combustion gas. The high-temperature combustion gas is discharged from the internal combustion engine 2 to an exhaust passage C0 as exhaust gas. The carbon dioxide separation device 10 is connected to the exhaust passage C1, and the exhaust gas from the exhaust passage C0 flows through the exhaust passage C1. Figure 1 The exhaust passages C0 , C1 , C2 , C3 , and C4 shown are hollow structures that constitute flow paths of exhaust gas, and are constituted by, for example, conduits that guide the exhaust gas to an exhaust port (not shown).

[0025] When the vehicle 1 is a gasoline vehicle, for example Figure 2A As shown, a catalyst 3, a filter 4, and a muffler 5 are arranged in the exhaust gas flow path between the internal combustion engine 2 and the carbon dioxide separation device 10. In this case, the exhaust passage C1 may be an exhaust passage connected to the muffler 5. The carbon dioxide separation device 10 is configured to separate carbon dioxide contained in the exhaust gas that flows from the internal combustion engine 2 through, for example, the catalyst 3, the filter 4, and the muffler 5 and flows into the carbon dioxide separation device 10 from the exhaust gas.

[0026] When the vehicle 1 is a diesel vehicle, for example Figure 2B As shown, a catalyst 6A, a filter 7, a selective catalytic reduction SCR8 (Selective Catalytic Reduction), a catalyst 6B, and a muffler 9 are arranged in the exhaust gas flow path between the internal combustion engine 2 and the carbon dioxide separation device 10. In this case, the exhaust passage C1 may be an exhaust passage connected to the muffler 9. The carbon dioxide separation device 10 is configured to separate carbon dioxide contained in the exhaust gas that flows from the internal combustion engine 2 through, for example, the catalyst 6A, the filter 7, the SCR8, the catalyst 6B, and the muffler 9 and flows into the carbon dioxide separation device 10 from the exhaust gas.

[0027] like Figure 1 As shown, the carbon dioxide separation device 10 includes a heat exchanger 20, a water adsorber 30, and a carbon dioxide collector 40. The heat exchanger 20 is connected to an exhaust passage C1 through which exhaust gas from the internal combustion engine 2 flows.

[0028] The water adsorber 30 is connected to the heat exchanger 20 via the exhaust passage C2. The carbon dioxide collector 40 is connected to the water adsorber 30 via the exhaust passage C3. The outlet of the carbon dioxide collector 40 is connected to the exhaust passage C4, which is directly or indirectly connected to an exhaust port for discharging exhaust gas to the outside of the vehicle 1.

[0029] The heat exchanger 20 is configured to cool the exhaust gas flowing from the internal combustion engine 2 through the exhaust passage C1 and into the heat exchanger 20. The high-temperature exhaust gas from the internal combustion engine 2 is cooled by the heat exchanger 20 to a temperature suitable for collecting (specifically, adsorbing) carbon dioxide in the carbon dioxide collector 40. The cooled low-temperature exhaust gas flows through the exhaust passage C2 and is sent to the water adsorber 30.

[0030] The water adsorber 30 functions as a dehydrating unit and is configured to remove water contained in the low-temperature exhaust gas flowing from the heat exchanger 20 through the exhaust passage C2 and into the water adsorber 30. The water adsorber 30 includes a water adsorbent 35 for adsorbing water contained in the exhaust gas.

[0031] For example, the water adsorbent 35 is filled in the water adsorber 30 in such a manner that the water adsorbent 35 substantially fills 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 may be composed of a combination of a plurality of types of water adsorbents.

[0032] The carbon dioxide collector 40 is configured to remove carbon dioxide from the exhaust gas that flows from the water adsorber 30 through the exhaust passage C3 and flows into the carbon dioxide collector 40, that is, the carbon dioxide in the exhaust gas that has passed through the water adsorbent 35. The carbon dioxide collector 40 includes a carbon dioxide adsorbent 45 for adsorbing carbon dioxide contained in the exhaust gas. In the present embodiment, the carbon dioxide collector 40 functions as a carbon dioxide adsorption unit.

[0033] For example, the carbon dioxide adsorbent 45 is filled in the carbon dioxide collector 40 in such a manner that the carbon dioxide adsorbent 45 substantially fills 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 framework (MOF) as solid adsorbents. Zeolite and the like are porous materials and have a high surface area.

[0034] The carbon dioxide separation device 10 is further provided with a drainage structure 50 in the exhaust passage C2 constituting a flow path of the exhaust gas between the heat exchanger 20 and the water adsorber 30 .

[0035] Due to the low temperature of the exhaust gas, part of the water vapor contained in the exhaust gas as moisture condenses. Through this condensation, part of the water vapor contained in the exhaust gas turns into liquid. In other words, the liquid water condensed from the exhaust gas adheres to the inner wall of the exhaust passage C2 and moves along the flow direction of the exhaust gas.

[0036] The drain structure 50 is provided to suppress the water condensed from the exhaust gas from flowing into the water adsorber 30 along the exhaust passage C2. Specifically, the drain structure 50 includes a water storage structure 51, a drain hole 53, and a valve 55. Figure 1 The cross-sectional shape of the drainage structure 50 is schematically shown.

[0037] The water storage structure 51 is configured to store water condensed from the exhaust gas. The water condensed from the exhaust gas falls to the lower side of the inner wall of the exhaust passage C2, that is, the bottom of the exhaust passage C2, under the action of gravity, and flows along the bottom toward the water adsorber 30. Below this is the direction in which gravity acts.

[0038] The exhaust passage C2 is configured such that the bottom of the exhaust passage C2 is horizontal from the heat exchanger 20 toward the water adsorber 30. Alternatively, the water adsorber 30 is configured such that its position is lower than that of the heat exchanger 20, and the exhaust passage C2 is configured such that its bottom forms an inclined downward slope from the heat exchanger 20 toward the water adsorber 30.

[0039] The water storage structure 51 is provided at the bottom of the exhaust channel C2, which is the main channel for water. The water storage structure 51 corresponds to the concave structure formed on the inner wall of the exhaust channel C2. The water storage structure 51 has a bottom at a position lower than the surrounding in the exhaust channel C2, so as to collect water from the surrounding and store the water. The water storage structure 51 is configured such that its bottom is inclined toward the lowest point, so as to collect water.

[0040] A drainage hole 53 is provided at the bottom of the water storage structure 51, and the drainage hole 53 is used to discharge the water collected and stored by the water storage structure 51. The drainage hole 53 includes: a bottom hole 53A provided at the bottom of the water storage structure 51 for drainage, and a hollow drainage pipe 53B extending downward from the bottom hole 53A. The bottom hole 53A is located at the lowest point of the water storage structure 51.

[0041] The drain pipe 53B is configured such that the second end of the drain pipe 53B is connected to the outside of the vehicle 1, thereby discharging water falling from the bottom hole 53A to the outside of the vehicle 1. In addition, the first end of the drain pipe 53B is connected to the bottom hole 53A, and the second end is located on the opposite side of the first end.

[0042] The valve 55 is provided at the upper portion of the drain pipe 53B, and the valve 55 is configured to change the flow of the drain pipe 53B. Ratio valve 55 of hole 53 The valve 55 is driven by, for example, an electric motor.The drain hole 53 is formed by a movable electric valve, and the valve 55 is configured to open / close the drain hole 53 according to a control signal issued by a controller 70 provided in the vehicle 1.

[0043] When the valve 55 is in the closed state, the flow path below the valve 55 in the drain hole 53 is blocked by the valve 55. Thus, water does not flow to the outside from the drain hole 53, but is stored in the water storage structure 51.

[0044] When the valve 55 is in the open state, the flow path below the valve 55 in the drain hole 53 is released. As a result, the water collected and stored in the water storage structure 51 is discharged to the outside through the drain hole 53.

[0045] The controller 70 is provided in the vehicle 1 for controlling the valve 55 of the carbon dioxide separation device 10. According to another example, an electronic control unit (ECU: Electronic Control Unit) for controlling the vehicle other than the valve control realizes the function as the controller 70.

[0046] 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 Figure 3 The valve control process shown in FIG. 7 is performed by the processor 71 in a loop. Figure 3 In the valve control process shown, when exhaust gas is generated in the internal combustion engine 2, the processor 71 controls the valve 55 so that the valve 55 is maintained in a closed state.

[0047] In the valve control process, the processor 71 keeps the valve 55 closed until the internal combustion engine 2 stops (S110, S120). This is because when the internal combustion engine 2 is not stopped, that is, when the internal combustion engine 2 is running, the exhaust gas generated by the internal combustion engine 2 may flow out from the drain hole 53. For example, the processor 71 can determine the operation / stop of the internal combustion engine 2 by receiving an on / off signal from the ignition switch.

[0048] When the processor 71 determines that the internal combustion engine 2 has stopped (Yes at S120), the processor 71 controls the valve 55 to keep the valve 55 open until a predetermined condition is satisfied (S130, S140). Thus, the water stored in the water storage structure 51 can be discharged to the outside through the drainage hole 53.

[0049] The processor 71 can keep the valve 55 open until the internal combustion engine 2 starts to operate. Alternatively, the processor 71 can keep the valve 55 open until a predetermined time has passed. The predetermined time may be a pre-estimated time required for all the water stored in the water storage structure 51 to flow out.

[0050] When the processor 71 determines that the predetermined condition is satisfied (Yes in S140), the processor 71 controls the valve 55 and switches the valve 55 to a closed state (S150). Thus, the drain hole 53 is closed. The processor 71 controls the drain time by cyclically executing the above process, thereby suppressing the outflow of exhaust gas.

[0051] Figure 4 The residual water in the exhaust gas flow path from the internal combustion engine 2 to the water adsorber 30 is conceptually shown. Changes in quantity. Figure 4 The vertical axis represents the amount of residual water, and the horizontal axis represents the position of the exhaust gas in the flow path.

[0052] The position P1 shown in the figure corresponds to the connection point between the internal combustion engine 2 and the exhaust passage C0. The position P2 corresponds to the connection point between the heat exchanger 20 and the exhaust passage C2. The position P3 corresponds to the setting point of the drainage structure 50. The position P4 corresponds to the connection point between the exhaust passage C2 and the water adsorber 30.

[0053] As described above, the water vapor contained in the exhaust gas condenses as the temperature decreases and is separated from the exhaust gas in the form of liquid water. Since the exhaust gas is forcibly cooled in the heat exchanger 20, the amount of water vapor flowing through the exhaust passage C2 at the P2 position decreases compared to the P1 position, while the amount of liquid water increases.

[0054] In the prior art, since there is no drainage structure 50, liquid water moves to position P4 together with water vapor and flows into the water adsorber 30. In contrast, in the present embodiment, since the drainage structure 50 is provided, most of the liquid water is discharged at position P3. The water reaching position P4 is mainly water vapor contained in the exhaust gas.

[0055] Therefore, according to the present embodiment, the amount of water that must be adsorbed in the water adsorber 30 can be significantly reduced compared to a case where the drainage structure 50 is not provided. In other words, the water adsorption capacity required of the water adsorber 30 can be significantly reduced.

[0056] The water adsorption capacity of the water adsorber 30 is related to the amount of adsorbent used. By reducing the required adsorption capacity, the amount of adsorbent required for the water adsorber 30 can be reduced, thereby achieving miniaturization and lightness of the water adsorber 30.

[0057] Therefore, according to the present embodiment, it is possible to reduce the dehydration capacity required for dehydrating the exhaust gas and provide a carbon dioxide separation device 10 that can effectively collect carbon dioxide and achieves miniaturization and weight reduction.

[0058] [Second embodiment]

[0059] Next, the carbon dioxide separation device 10 of the second embodiment is described. The carbon dioxide separation device 10 of the second embodiment is basically the same as the first embodiment except for the drainage structure 80. Therefore, in the following description, Figure 5 The configuration of the drainage structure 80 will be selectively described.

[0060] The carbon dioxide separation device 10 of the second embodiment has a heat exchanger 20 and a water adsorber 30. A drainage structure 80 is provided at a position adjacent to the water adsorber 30 in the exhaust passage C2.

[0061] The water adsorber 30 includes a water adsorbent 35 in a housing 31 constituting an exhaust gas flow path. The water adsorbent 35 is filled in the housing 31 so as to fill substantially the entire cross section perpendicular to the exhaust gas flow direction.

[0062] The drain structure 80 includes a water storage structure 81 , a drain hole 83 , and a valve 85 as a structure for suppressing water condensed from the exhaust gas from flowing into the water adsorber 30 . Figure 5 The cross-sectional shapes of the drainage structure 80 and the water adsorber 30 are schematically shown.

[0063] The water storage structure 81 is provided at a position located at the lower side of the inner wall of the exhaust channel C2 at the connection point between the shell 31 of the water adsorber 30 and the exhaust channel C2, that is, at the bottom of the exhaust channel C2. The water storage structure 81 forms a water storage space that is separated from the accommodating space of the water adsorber 35 in the shell 31. The water storage space corresponds to a space surrounded by the inner wall of the exhaust channel C2 that is recessed downward and the outer wall of the shell 31.

[0064] The water storage space is located below the exhaust gas inlet 33 in the water adsorber 30. Therefore, when water condensed from the exhaust gas moves toward the water adsorber 30 along the exhaust passage C2, the water does not reach the water adsorber 30 but is stored in the water storage structure 81.

[0065] In order to discharge the water stored in the water storage structure 81 , the drain hole 83 includes a bottom hole 83A provided at the bottom of the water storage structure 81 for draining water, and a hollow drain pipe 83B extending downward from the bottom hole 83A.

[0066] The water storage structure 81 is configured such that its bottom is inclined toward the lowest point to collect water. A bottom hole 83A is provided at the lowest point of the water storage structure 81. The drain pipe 83B is configured such that, like the drain pipe 53B, water falling from the bottom hole 83A can be discharged to the outside of the vehicle 1.

[0067] The valve 85 is provided in the drain pipe 83B, and is configured to change the flow rate of water flowing through the drain hole 83 at a position below the valve 85. Like the valve 55, the valve 85 is also configured as an electric valve, and its opening / closing is controlled by the controller 70 provided in the vehicle 1.

[0068] According to the present embodiment, the drainage structure 80 is provided at a position very close to the water adsorbent 35 in the exhaust gas flow path before the exhaust gas reaches the water adsorbent 35. The water adsorbent 35 is removed from the exhaust gas Most of the water separated from the The condensed water at position 35 can be discharged.

[0069] Therefore, according to the present embodiment, it is possible to realize the miniaturization and weight reduction of the water adsorber 30 , and provide a carbon dioxide separation device 10 that is particularly suitable for vehicle-mounted use.

[0070] [Third Embodiment]

[0071] Next, the carbon dioxide separation device 10 of the third embodiment is described. Except for the drainage structure 90, the carbon dioxide separation device 10 of the third embodiment is basically the same as the first embodiment. Therefore, in the following description, Figure 6 The configuration of the drainage structure 90 will be selectively described.

[0072] 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 has a recessed structure 91, drainage holes 93, and a water tank 98. Figure 6 The cross-sectional shape of the drainage structure 90 is schematically shown.

[0073] The recessed structure 91 is configured similarly to the water storage structure 51 of the first embodiment. The drain hole 93 is also similar to the drain hole 53 of the first embodiment, and includes a bottom hole 93A provided at the bottom of the recessed structure 91 and a drain pipe 93B for draining water.

[0074] However, in this embodiment, there is no valve in the drain pipe 93B. The drain pipe 93B is configured so that the end of the drain pipe 93B is immersed in the water tank 98 filled with water. Specifically, the drain pipe 93B is configured so that the second end of the drain pipe 93B is located below the water surface of the water tank 98, and the first end of the drain pipe 93B is connected to the recessed structure 91, and the second end is located on the opposite side of the first end. With this configuration, the second end of the drain pipe 93B is closed by water, thereby suppressing the outflow of exhaust gas.

[0075] Water condensed from the exhaust gas flows into the recessed structure 91 having a bottom lower than the surroundings while flowing through the exhaust passage C2. The water flowing into the recessed structure 91 falls into the water tank 98 from the bottom hole 93A through the drain pipe 93B.

[0076] The water tank 98 is configured such that when the water tank 98 is completely filled with water, the water level thereof is lower than the first end of the drain pipe 93B. Therefore, when the amount of water in the water tank 98 increases due to the water falling into the water tank 98, the water of the drain pipe 93B overflows from the water tank 98, and the water level of the drain pipe 93B does not reach the first end.

[0077] As described above, according to the drainage structure 90 of this embodiment, the water collected in the recessed structure 91 can be The water is discharged to the outside as water overflowing from the water tank 98. The drainage structure 90 can suppress the outflow of exhaust gas and discharge the water collected in the recessed structure 91 to the outside without using a valve.

[0078] [Other embodiments]

[0079] The present disclosure is not limited to the above-described embodiments, and can take various forms.

[0080] For example, the technology disclosed in the present invention is not limited to the carbon dioxide separation device 10 used in vehicles. For example, the technology disclosed in the present invention can be applied to a carbon dioxide separation device installed in a general home, office, or factory and used to process exhaust gas from a combustion device or an incineration device. The drainage structure 50, 80 may not include the valve 55, 85.

[0081] The carbon dioxide separation device 10 may be provided with a filter as a dehydration unit instead of the water adsorber 30, and the filter removes moisture in the exhaust gas using a separation membrane. The separation membrane may be composed of a membrane material having the following characteristics, that is, allowing the exhaust gas to pass through but not allowing the moisture contained in the exhaust gas to pass through. In the case where the amount of water flowing into the separation membrane is related to the dehydration capacity of the filter, the size of the filter can be reduced and the installation cost can be reduced by applying the technology disclosed in the present invention.

[0082] The carbon dioxide collector 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 may use a liquid material such as an amine solution as a carbon dioxide absorbent, thereby separating carbon dioxide from the exhaust gas. That is, the "collection" in the present specification may be understood to include the two concepts of "adsorption" and "absorption".

[0083] like Figure 2A and Figure 2B As shown, the carbon dioxide separation device 10 can be configured to process the exhaust gas that flows directly or indirectly from the internal combustion engine 2 into the carbon dioxide separation device 10. Figure 7 As shown, the carbon dioxide separation device 10 may also be configured so that only a portion of the exhaust gas from the internal combustion engine 2, which is diverted by, for example, a valve or a separation membrane, flows into the carbon dioxide separation device 10. In this case, the carbon dioxide separation device 10 can function in a manner of separating carbon dioxide from a portion of the exhaust gas generated by the internal combustion engine 2.

[0084] The functions of one component in the above-mentioned embodiment may be distributed to multiple Constituent elements. The functions of multiple components may be integrated into one component. A part of the configuration of the above-mentioned embodiment may be omitted. At least a part of the configuration of the above-mentioned embodiment may also be added to the configuration of the above-mentioned other embodiment, or at least a part of the configuration of the above-mentioned embodiment may be replaced with the configuration of the above-mentioned other embodiment. All modes included in the technical ideas determined by the sentences recorded in the present disclosure are embodiments of the present disclosure.

[0085] [Technical ideas disclosed in this specification]

[0086] It can be understood that this specification discloses the following technical ideas.

[0087] [Project 1]

[0088] A carbon dioxide separation device, characterized by comprising:

[0089] a dehydration unit connected to a heat exchanger configured to cool exhaust gas discharged from an internal combustion engine, and configured to remove water contained in the exhaust gas flowing from the heat exchanger into the dehydration unit;

[0090] a carbon dioxide collecting section configured to adsorb and / or absorb carbon dioxide contained in the exhaust gas having passed through the dehydration section; and

[0091] A drainage structure is provided in a flow path of the exhaust gas between the heat exchanger and the dehydration unit, and is used to suppress water condensed from the exhaust gas from flowing into the dehydration unit along the flow path.

[0092] [Project 2]

[0093] The carbon dioxide separation device according to item 1 is characterized in that

[0094] The carbon dioxide collecting unit includes zeolite as an adsorbent for the carbon dioxide.

[0095] [Item 3]

[0096] The carbon dioxide separation device according to item 1 or 2 is characterized in that:

[0097] The carbon dioxide separation device is to be installed in a vehicle equipped with the internal combustion engine.

[0098] [Item 4]

[0099] The carbon dioxide separation device according to any one of items 1 to 3 is characterized in that

[0100] The drainage structure comprises:

[0101] a recessed structure configured to collect water condensed from the exhaust gas; and

[0102] A drainage hole is configured to drain water collected by the recessed structure.

[0103] [Item 5]

[0104] The carbon dioxide separation device according to item 4 is characterized in that the drain hole is provided with a valve for controlling the drain time.

Claims

1. A carbon dioxide separation device, characterized in that: have: a dehydration unit connected to a heat exchanger configured to cool exhaust gas discharged from an internal combustion engine, and configured to remove water contained in the exhaust gas flowing from the heat exchanger into the dehydration unit; a carbon dioxide collecting section configured to adsorb and / or absorb carbon dioxide contained in the exhaust gas having passed through the dehydration section; and A drainage structure is provided in a flow path of the exhaust gas between the heat exchanger and the dehydration unit, and is used to suppress water condensed from the exhaust gas from flowing into the dehydration unit along the flow path.

2. The carbon dioxide separation device according to claim 1, characterized in that: The carbon dioxide collecting unit includes zeolite as an adsorbent for the carbon dioxide.

3. The carbon dioxide separation device according to claim 1, characterized in that: The carbon dioxide separation device is to be installed in a vehicle equipped with the internal combustion engine.

4. The carbon dioxide separation device according to claim 2, characterized in that: The carbon dioxide separation device is to be installed in a vehicle equipped with the internal combustion engine.

5. The carbon dioxide separation device according to any one of claims 1 to 3, characterized in that: The drainage structure comprises: a recessed structure configured to collect water condensed from the exhaust gas; and A drainage hole is configured to drain water collected by the recessed structure.

6. The carbon dioxide separation device according to claim 5, characterized in that: The drain hole is provided with a valve for controlling the draining time.

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