CO2 recovery device

Abstract

To provide a CO2 capture device that contributes to the weight reduction and miniaturization of vehicles. [Solution] In the CO2 recovery device, the CO2 recovery unit, when switched to the adsorption process, adsorbs CO2 contained in the exhaust gas, and when switched to the regeneration process, desorbs the CO2 and discharges the CO2-containing gas. The CO2 storage unit introduces the CO2-containing gas discharged from the CO2 recovery unit and stores the CO2-containing gas. At least the CO2 storage unit is located in a non-vehicle part that is not mounted on the vehicle. At least the exhaust gas discharge point is located in a vehicle-mounted part that is mounted on the vehicle. Part of the flow path from the discharge point through the CO2 recovery unit to the CO2 storage unit is composed of at least one connecting pipe that connects the vehicle-mounted part and the non-vehicle part.

Description

Technical Field

[0001] The present disclosure relates to a CO2 recovery device.

Background Art

[0002] In Patent Document 1 below, an in-vehicle CO2 recovery device is disclosed. In the case of the CO2 recovery device described in Patent Document 1, CO2 is desorbed from the adsorption part in the recovery stand, and the CO2 is recovered to the recovery stand. Further, Patent Document 1 discloses that a CO2 tank for temporarily storing the adsorbed carbon dioxide may be provided separately, and in that case, the CO2 stored in the CO2 tank is desorbed and the CO2 is recovered to the recovery stand.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, mounting a CO2 tank as described above on a vehicle causes a factor of increasing the weight of the vehicle. In addition, since a space for arranging the CO2 tank is required, it becomes a factor of increasing the size of the vehicle.

[0005] In one aspect of the present disclosure, it is desirable to provide a CO2 recovery device that contributes to weight reduction and size reduction of a vehicle.

Means for Solving the Problems

[0006] (A) One aspect of the present disclosure is a CO2 recovery device for recovering CO2 from the exhaust gas of an internal combustion engine of at least one vehicle, comprising a CO2 recovery unit and a CO2 storage unit. The CO2 recovery unit is configured to be switchable between at least an adsorption step and a regeneration step, and when switched to the adsorption step, it introduces exhaust gas and adsorbs CO2 contained in the exhaust gas, and when switched to the regeneration step, it desorbs the CO2 adsorbed in the adsorption step and discharges a CO2-containing gas containing that CO2. The CO2 storage unit is configured to introduce the CO2-containing gas discharged from the CO2 recovery unit and store the CO2-containing gas. At least the CO2 storage unit is located in a non-vehicle part that is not mounted on the vehicle. At least the exhaust gas discharge point is located in a vehicle part that is mounted on the vehicle. Part of the flow path from the discharge point through the CO2 recovery unit to the CO2 storage unit is comprised of at least one connecting pipe that connects the vehicle part and the non-vehicle part.

[0007] In a CO2 capture system configured in this way, at least the CO2 storage unit is included in the non-vehicle section. Therefore, unlike CO2 capture systems equipped with vehicle-mounted CO2 storage units, the vehicle can be made lighter by at least the weight of the CO2 storage unit. In addition, since there is no need to provide space in the vehicle for the CO2 storage unit, the vehicle can be made smaller by that amount.

[0008] (B) In one aspect of the present disclosure, the CO2 recovery unit may be included in a non-vehicle unit. In this configuration of CO2 capture system, the CO2 capture unit is included in the non-vehicle section. Therefore, unlike CO2 capture systems with a vehicle-mounted CO2 capture unit, the weight of the vehicle can be reduced by the amount of the CO2 capture unit's weight. In addition, since there is no need to provide space in the vehicle for the CO2 capture unit, the vehicle can be made smaller.

[0009] (C) In one aspect of this disclosure, the CO2 recovery unit may be included in the vehicle. Even with a CO2 capture system configured in this way, at least the CO2 storage unit is included in the non-vehicle portion. Therefore, unlike CO2 capture systems equipped with vehicle-mounted CO2 storage units, the vehicle can be made lighter by at least the weight of the CO2 storage unit. In addition, since there is no need to provide space in the vehicle for the CO2 storage unit, the vehicle can be made smaller by that amount.

[0010] (D) In ​​one aspect of the present disclosure, a water recovery unit may be provided upstream of the CO2 recovery unit, which introduces exhaust gas and recovers water contained in the exhaust gas. The exhaust gas from which water has been recovered in the water recovery unit may be configured to be introduced into the CO2 recovery unit.

[0011] With a CO2 recovery system configured in this way, exhaust gas from which water has been recovered in the water recovery section can be introduced into the CO2 recovery section. Therefore, it is possible to suppress the reduction in CO2 recovery capacity in the CO2 recovery section due to water.

[0012] (E) In one aspect of the present disclosure, a CO2 purification unit may be provided downstream of the CO2 storage unit, which introduces the CO2-containing gas stored in the CO2 storage unit and purifies it into CO2 of higher purity.

[0013] With a CO2 recovery system configured in this way, the CO2 purification section can purify the CO2 to a higher purity. (F) In one aspect of the present disclosure, at least one vehicle may be multiple vehicles. At least one connecting pipe may be multiple connecting pipes. Each of the multiple vehicles may be configured to have an on-board section and a non-on-board section connected via multiple connecting pipes.

[0014] In this CO2 recovery system, the on-board sections of multiple vehicles and one non-on-board section are connected via multiple connecting pipes. Therefore, for example, if the CO2 recovery section is located in the non-on-board section, the exhaust gas emitted from each of the multiple vehicles can be sent to the single non-on-board section. Consequently, the CO2 contained in the exhaust gas can be recovered in the CO2 recovery section located in the non-on-board section, and the CO2-containing gas can be stored in the CO2 storage section located in the non-on-board section.

[0015] Alternatively, for example, if the CO2 recovery unit is included in the vehicle-mounted unit, the CO2-containing gas, which includes CO2 recovered from each of multiple vehicles, can be sent to a single non-vehicle unit. Therefore, the CO2-containing gas can be stored in a CO2 storage unit located in the non-vehicle unit. [Brief explanation of the drawing]

[0016] [Figure 1] Figure 1 is a diagram showing the configuration of the CO2 recovery device according to the first embodiment. [Figure 2] Figure 2 is a diagram showing the configuration of the recovery device according to the first embodiment. [Figure 3] Figure 3A is an explanatory diagram showing a state where the first channel system is in the adsorption process and the second channel system is in the regeneration process. Figure 3B is an explanatory diagram showing a state where the first channel system is in the regeneration process and the second channel system is in the adsorption process. [Figure 4] Figure 4 is a configuration diagram showing the configuration of the recovery device according to the first embodiment. [Figure 5] Figure 5 is a configuration diagram showing the configuration of the CO2 recovery device according to the second embodiment. [Figure 6] Figure 6 is a diagram showing the configuration of the CO2 recovery device according to the third embodiment. [Figure 7] Figure 7 is a diagram showing the configuration of the recovery device and storage device according to the fourth embodiment. [Figure 8] Figure 8 is a configuration diagram showing the setup of the recovery device according to the fifth embodiment. [Figure 9] Figure 9 is a configuration diagram showing the setup of the recovery device according to the sixth embodiment.

Best Mode for Carrying Out the Invention

[0017] Next, the above-described CO2 recovery device will be described with exemplary embodiments. (1) First Embodiment [Configuration of CO2 Recovery Device] The CO2 recovery device 1 illustrated in FIG. 1 is a device that recovers CO2 from the exhaust gas of the internal combustion engine of at least one vehicle 2. In the case of this embodiment, although three vehicles 2 are illustrated in FIG. 1, the number of vehicles 2 is arbitrary. The vehicle 2 includes an exhaust portion 2A that discharges exhaust gas. In the case of this embodiment, the exhaust portion 2A is included in the vehicle-mounted portion 3 mounted on the vehicle 2.

[0018] The CO2 recovery device 1 includes a recovery device 5 and a storage device 6. In the case of this embodiment, the recovery device 5 and the storage device 6 are included in the non-vehicle-mounted portion 7 that is not mounted on the vehicle 2. Between the vehicle-mounted portion 3 and the non-vehicle-mounted portion 7, at least one connection pipe 8 that connects the vehicle-mounted portion 3 and the non-vehicle-mounted portion 7 is provided. In the case of this embodiment, three connection pipes 8 corresponding to each of the three vehicles 2 are provided. The connection pipe 8 is provided with a check valve 9 and is configured so that the exhaust gas does not flow backward toward the exhaust portion 2A side.

[0019] The vehicle 2 illustrated in this embodiment assumes a vehicle that hardly moves during operation or moves only within a limited range, such as construction machinery, industrial vehicles, and agricultural machinery. On the other hand, the non-vehicle-mounted portion 7 assumes a stationary device that is installed at a fixed position in the vicinity of the vehicle 2.

[0020] The connecting pipe 8 is designed to maintain the connection between the on-board section 3 and the non-on-board section 7, corresponding to the vehicle 2 with limited movement and the non-on-board section 7 that does not move. Specifically, if the vehicle 2 can move to some extent, at least a portion of the connecting pipe 8 may be made of flexible piping, and the portion made of flexible piping may be configured to bend and displace in accordance with the movement of the vehicle 2. If the vehicle 2 does not move, the entire connecting pipe 8 may be configured to be immovable.

[0021] In areas close to the vehicle-mounted section 3, high-temperature exhaust gas flows through the connecting pipe 8, so it is advisable to use heat-resistant piping such as stainless steel pipes or stainless steel flexible tubes for the connecting pipe 8. In areas sufficiently far from the vehicle-mounted section 3, the temperature of the exhaust gas flowing through the connecting pipe 8 drops to near room temperature, so the connecting pipe 8 may be made of less heat-resistant piping such as resin pipes or rubber tubes.

[0022] The connection point between the vehicle-mounted unit 3 and the connecting pipe 8 should be configured to allow for easy attachment and detachment, for example, by using a one-touch fitting (push-in fitting). The total length of the connecting pipe 8 should be sufficient considering the range of movement of the vehicle 2. It is preferable that the lengths of multiple connecting pipes 8 be similar within a range where the pressure loss is approximately the same.

[0023] The recovery device 5, as shown in detail in Figure 2, comprises a heat exchanger 11, a plurality of water recovery units 13A, 13B, a plurality of CO2 recovery units 15A, 15B, and pumps 17, 19. The heat exchanger 11, water recovery units 13A and 13B, and CO2 recovery units 15A and 15B are connected to channels 21A, 21B, 21C, and 21D. More specifically, channel 21A is connected to the upstream side of the heat exchanger 11. Channel 21B is connected to the downstream side of the heat exchanger 11 and to the upstream side of the water recovery units 13A and 13B. Channel 21C is connected to the downstream side of the water recovery units 13A and 13B and to the upstream side of the CO2 recovery units 15A and 15B. Channel 21D is connected to the downstream side of the CO2 recovery units 15A and 15B.

[0024] The water recovery units 13A and 13B, and the pump 17 are connected to the flow paths 21E and 21F. More specifically, flow path 21E is connected to the upstream side of the water recovery units 13A and 13B and the pump 17. Flow path 21F is connected to the downstream side of the pump 17.

[0025] The CO2 recovery units 15A and 15B, and the pump 19 are connected to the flow paths 21G and 21H. More specifically, flow path 21G is connected to the upstream side of the CO2 recovery units 15A and 15B and the pump 19. Flow path 21H is connected to the downstream side of the pump 19.

[0026] Flow path 21B is provided with flow path switching valve 23A. Flow path 21C is provided with flow path switching valves 23B and 23C. Flow path 21D is provided with flow path switching valve 23D. Flow path 21E is provided with flow path switching valve 23E. Flow path 21G is provided with flow path switching valve 23F.

[0027] The heat exchanger 11 lowers the temperature of the exhaust gas by exchanging heat between the high-temperature exhaust gas and a medium that is colder than the exhaust gas. The medium that is colder than the exhaust gas is not particularly limited, but for example, it could be ambient air or the cooling water of an onboard cooling system. The heat exchanger 11 lowers the temperature of the exhaust gas to a temperature at which CO2 can be easily adsorbed.

[0028] In this embodiment, the multiple water recovery units 13A, 13B are two water recovery units 13A, 13B. The water recovery units 13A, 13B are configured to introduce exhaust gas from the upstream flow path 21A and pass it through the downstream flow path 21B. More specifically, the water recovery units 13A, 13B have a structure in which an adsorbent having the ability to adsorb water and CO2 is filled inside a container having an inlet and an outlet, and are configured to introduce exhaust gas from the inlet and pass it through to the outlet.

[0029] The adsorbent used in the water recovery sections 13A and 13B is not particularly limited as long as it is an adsorbent that has the ability to adsorb water. For example, silica gel, zeolite, and activated alumina are preferred.

[0030] Furthermore, in this embodiment, the multiple CO2 recovery units 15A, 15B are actually two CO2 recovery units 15A, 15B. The CO2 recovery units 15A, 15B are configured to introduce exhaust gas that has passed through the water recovery units 13A, 13B from the upstream flow path 21C and pass it through to the downstream flow path 21D. More specifically, the CO2 recovery units 15A, 15B are constructed by filling the inside of a container having an inlet and an outlet with an adsorbent material that has the ability to adsorb CO2, and are configured to introduce exhaust gas that has passed through the water recovery units 13A, 13B from the inlet and pass it through to the outlet.

[0031] The adsorbent used in the CO2 recovery units 15A and 15B is not particularly limited as long as it is an adsorbent that has the ability to adsorb CO2. For example, zeolite, MOF (Metal Organic Frameworks), activated carbon, magnesium oxide, solid amine, and calcium oxide are suitable. The CO2 recovery units 15A and 15B adsorb CO2 from the exhaust gas as it passes through.

[0032] Pump 17 is a vacuum pump used to evacuate the inside of water recovery sections 13A and 13B when restoring their adsorption capacity. The gas sucked out from inside the water recovery sections 13A and 13B by pump 17 when it is operating contains water but almost no CO2, and is therefore released from pump 17 to the outside (i.e., outside the recovery device 5 system). When evacuating the inside of the water recovery sections 13A and 13B, the inside of the water recovery sections 13A and 13B may be heated. As a heat source for this heating, for example, heat obtained from the high-temperature exhaust gas in the heat exchanger 11 can be used.

[0033] Pump 19 is a vacuum pump used to evacuate the inside of CO2 recovery units 15A and 15B when restoring their adsorption capacity. The gas sucked out from inside the CO2 recovery units 15A and 15B by pump 19 when it is operating is a CO2-containing gas that includes the CO2 to be recovered by the CO2 recovery device 1. When evacuating the inside of the CO2 recovery units 15A and 15B, the inside of the CO2 recovery units 15A and 15B may be heated. As a heat source for this heating, for example, heat obtained from the high-temperature exhaust gas in the heat exchanger 11 can be used.

[0034] In this embodiment, each of the flow path switching valves 23A to 23F is composed of a three-way valve. The flow path switching valves 23A to 23F are operated under the control of an ECU (electronic control unit) (not shown).

[0035] Figure 3A shows the state in which the flow path system (hereinafter also referred to as the first flow path system) equipped with the water recovery unit 13A and the CO2 recovery unit 15A in the recovery device 5 is in the adsorption process. At this time, the flow path system (hereinafter also referred to as the second flow path system) equipped with the water recovery unit 13B and the CO2 recovery unit 15B is in the regeneration process. In Figure 3A, the flow paths shown by solid lines are flow paths through which gas is flowing. The flow paths shown by dashed lines are flow paths through which gas is not flowing.

[0036] Figure 3B shows the second flow path system in the recovery device 5, which includes the water recovery unit 13B and the CO2 recovery unit 15B, in the adsorption process. At this time, the first flow path system, which includes the water recovery unit 13A and the CO2 recovery unit 15A, is in the regeneration process. In Figure 3B, the flow paths shown by solid lines are flow paths through which gas is flowing. The flow paths shown by dashed lines are flow paths through which gas is not flowing.

[0037] By switching between the two flow path systems in this way, continuous operation is possible with one flow path system always in the adsorption process. In this embodiment, the state shown in Figure 2A and the state shown in Figure 2B are alternately switched by the ECU. In this embodiment, as described above, the first and second flow path systems are switched alternately, but it is also possible to configure the system to switch between three or more flow path systems in sequence.

[0038] For example, if the service life of one channel system in the adsorption process is only half the time required for the regeneration process, it is advisable to operate by sequentially switching between three channel systems. In this case, by operating one channel system in the adsorption process while overlapping and operating the other two channel systems in the regeneration process, continuous operation is possible with at least one system always in the adsorption process.

[0039] Furthermore, even if, for example, the service life of one channel system in the adsorption process is twice the time required for the regeneration process, it is advisable to operate by sequentially switching between the three channel systems. In this case, by operating two channel systems in the adsorption process with overlapping configurations while operating one channel system in the regeneration process, continuous operation is possible with two systems always in the adsorption process.

[0040] The storage device 6, as shown in detail in Figure 4, comprises a dewatering section 31, a CO2 storage section 33, a filter 35, and a CO2 purification section 37. CO2-containing gas delivered from the pump 19 of the recovery device 5 flows into the dewatering unit 31. The dewatering unit 31 removes water from the CO2-containing gas. The specific configuration of the dewatering unit 31 is not particularly limited, but for example, it may be composed of an adsorption tower filled with an adsorbent having water adsorption capacity, similar to the water recovery units 13A and 13B described above. The dewatering unit 31 may be configured to enable continuous operation by having multiple adsorption towers switchable between the adsorption process and the regeneration process, and by having at least one adsorption tower operating in the adsorption process, similar to the water recovery units 13A and 13B described above. Alternatively, the dewatering unit 31 may be configured as a replaceable structure, such as a cartridge type, so that it can be replaced when it has reached the end of its service life.

[0041] The CO2 storage section 33 stores the CO2-containing gas flowing in from the dewatering section 31. The specific configuration of the CO2 storage section 33 is not particularly limited, but for example, it may be composed of an adsorption tower filled with an adsorbent having the ability to adsorb CO2, similar to the CO2 recovery sections 15A and 15B described above. Alternatively, the CO2 storage section 33 may be equipped with a compressor, and may be configured to compress the CO2-containing gas with the compressor so that the CO2-containing gas is filled into a pressure tank at high pressure.

[0042] The filter 35 is configured to remove impurities such as NOx. For example, the filter 35 may be a NOx absorption filter in which an adsorbent material capable of adsorbing NOx, such as activated carbon, is supported on a permeable carrier. In this embodiment, the filter 35 is provided downstream of the CO2 storage unit 33, but the filter 35 may also be provided upstream of the CO2 storage unit 33.

[0043] The CO2 purification unit 37 is configured to purify the CO2-containing gas supplied from the CO2 storage unit 33 into CO2 of higher purity. Generally, the exhaust gas emitted from the exhaust unit 2A of the vehicle 2 contains a low concentration of CO2. In the recovery device 5, CO2 is recovered from the exhaust gas, and the CO2-containing gas containing the recovered CO2 is stored in the CO2 storage unit 33. Since CO2 is selectively recovered from the exhaust gas in the recovery device 5, the CO2-containing gas supplied from the recovery device 5 to the CO2 storage unit 33 becomes CO2 of medium concentration.

[0044] The CO2 purification unit 37 purifies medium-concentration CO2 into high-concentration CO2. The high-concentration CO2 purified in the CO2 purification unit 37 can be used for applications such as alkali neutralizing agents, concrete fixing, agricultural applications, carbon dioxide cylinders, and dry ice.

[0045] The CO2 purification unit 37 can be operated at any time, regardless of whether the recovery device 5 is in operation, as long as sufficient CO2 is stored in the CO2 storage unit 33. Therefore, high-concentration CO2 can be utilized at the required time, independently of the recovery device 5. Thus, in locations where high-concentration CO2 is needed, high-concentration CO2 can be obtained by operating the CO2 purification unit 37 without having to purchase and store high-concentration CO2.

[0046] [effect] With the CO2 recovery device 1 configured in this way, at least the CO2 storage unit 33 is included in the non-vehicle unit 7. Therefore, unlike CO2 recovery devices equipped with a vehicle-mounted CO2 storage unit, the vehicle 2 can be made lighter by at least the weight of the CO2 storage unit 33. In addition, since there is no need to provide space in the vehicle 2 for the CO2 storage unit 33, the vehicle 2 can be made smaller by that amount.

[0047] Furthermore, in this embodiment, the CO2 recovery units 15A and 15B are included in the non-vehicle unit 7. Therefore, unlike CO2 recovery devices equipped with vehicle-mounted CO2 recovery units, the weight of the vehicle 2 can be reduced by the weight of the CO2 recovery units 15A and 15B. In addition, since there is no need to provide space in the vehicle for the CO2 recovery units 15A and 15B, the vehicle 2 can be made smaller by that amount.

[0048] Furthermore, in this embodiment, since water recovery units 13A and 13B are provided, the exhaust gas from which water has been recovered in the water recovery units 13A and 13B can be introduced into the CO2 recovery units 15A and 15B. Therefore, it is possible to suppress the reduction in the CO2 recovery capacity of the CO2 recovery units 15A and 15B due to water.

[0049] Furthermore, in this embodiment, since a CO2 purification unit 37 is provided, the recovered CO2 can be purified to a higher purity CO2. Furthermore, in this embodiment, the on-board sections 3 of each of the multiple vehicles 2 and one non-on-board section 7 are connected via multiple connecting pipes 8. Therefore, the exhaust gas emitted from each of the multiple vehicles 2 can be sent to the one non-on-board section 7. Consequently, CO2 contained in the exhaust gas can be recovered in the CO2 recovery sections 15A and 15B located in the non-on-board section 7, and the CO2-containing gas can be stored in the CO2 storage section 33 located in the non-on-board section 7.

[0050] (2) Second Embodiment Next, the second embodiment will be described. Note that each embodiment from the second embodiment onward is an embodiment that modifies some of the configurations exemplified in the first embodiment. Therefore, the differences from the first embodiment will be described in detail, and detailed explanations of parts that are similar to the first embodiment will be omitted.

[0051] The CO2 recovery device 41 illustrated in Figure 5 differs from the first embodiment in that the recovery device 5 described in the first embodiment is mounted on the vehicle 2. That is, in the second embodiment, the discharge section 2A and the recovery device 5 are included in the vehicle-mounted section 3, and the storage device 6 is included in the non-vehicle-mounted section 7. In this embodiment, the connecting pipe 8 is used as a pipe for sending CO2-containing gas from the recovery device 5 to the storage device 6.

[0052] Even with the CO2 recovery device 41 configured as described above, at least the CO2 storage unit 33 is included in the non-vehicle unit 7. Therefore, unlike CO2 recovery devices equipped with a vehicle-mounted CO2 storage unit, the vehicle 2 can be made lighter by at least the weight of the CO2 storage unit 33. In addition, since there is no need to provide space in the vehicle 2 for the CO2 storage unit 33, the vehicle 2 can be made smaller by that amount.

[0053] (3) Third Embodiment Next, a third embodiment will be described. The CO2 recovery device 51 illustrated in Figure 6 differs from the first embodiment in that it has the same number of recovery devices 5 as the vehicle 2. That is, in the third embodiment, three recovery devices 5 and one storage device 6 are included in the non-vehicle unit 7.

[0054] Even with the CO2 recovery device 51 configured as described above, at least the CO2 storage unit 33 is included in the non-vehicle unit 7. Therefore, unlike CO2 recovery devices equipped with a vehicle-mounted CO2 storage unit, the vehicle 2 can be made lighter by at least the weight of the CO2 storage unit 33. In addition, since there is no need to provide space in the vehicle 2 for the CO2 storage unit 33, the vehicle 2 can be made smaller by that amount.

[0055] (4) Fourth Embodiment Next, a fourth embodiment will be described. The recovery device 65 and storage device 66 illustrated in Figure 7 differ from the first embodiment in that the recovery device 65 does not have a pump 19, while the storage device 66 does have a pump 19.

[0056] With the configuration described above, the weight of the pump 19 can be used to reduce the weight of the recovery device 65. Therefore, when the recovery device 65 is mounted on the vehicle, the weight of the vehicle 2 can be reduced by the weight of the pump 19 compared to when the recovery device 5 is mounted on the vehicle as in the second embodiment.

[0057] (5) Fifth embodiment Next, a fifth embodiment will be described. The recovery device 75 illustrated in Figure 8 differs from the first embodiment in that it has a single flow path system comprising a water recovery unit 13 and a CO2 recovery unit 15.

[0058] In the configuration described above, the flow path system comprising the water recovery unit 13 and the CO2 recovery unit 15 becomes a single system, thus reducing the weight of the recovery device 75 and simplifying the structure of the device. However, continuous operation while switching between the two flow path systems is not possible, so in this case, the operation should be carried out by alternately switching between the operating period in the adsorption process and the operating period in the regeneration process.

[0059] (6) Sixth Embodiment Next, a sixth embodiment will be described. The recovery device 85 illustrated in Figure 9 differs from the first embodiment in that, in addition to the heat exchanger 11A provided upstream of the water recovery units 13A and 13B, another heat exchanger 11B is provided between the water recovery units 13A and 13B and the CO2 recovery units 15A and 15B.

[0060] With the configuration described above, even if the temperature of the CO2-containing gas rises due to adsorption heat generated when water is adsorbed in the water recovery units 13A and 13B, heat can be dissipated from the CO2-containing gas in the heat exchanger 11B. Therefore, compared to the first embodiment, which does not have a configuration equivalent to the heat exchanger 11B, the CO2 recovery efficiency in the CO2 recovery units 15A and 15B can be increased.

[0061] (7) Other embodiments Although the CO2 capture device has been described above with reference to exemplary embodiments, the above-described embodiments are merely illustrative examples of one aspect of the present disclosure. In other words, the present disclosure is not limited to the above-described exemplary embodiments and can be implemented in various forms without departing from the technical idea of ​​the present disclosure.

[0062] For example, in the above embodiment, an example was shown in which a dewatering unit 31 is provided in the storage device 6, but whether or not to provide the dewatering unit 31 is optional. For example, if the CO2-containing gas supplied to the storage device 6 is a sufficiently low-humidity gas, the dewatering unit 31 does not need to be provided.

[0063] Furthermore, although the above embodiment shows an example in which a filter 35 is provided in the storage device 6, it is optional whether or not to provide the filter 35. Also, although the above embodiment shows an example in which a CO2 purification unit 37 is provided in the storage device 6, it is optional whether or not to provide the CO2 purification unit 37. If the CO2 purification unit 37 is not provided, a CO2-containing gas of medium concentration will be stored in the CO2 storage unit 33, but such a CO2-containing gas of medium concentration may be taken to a recovery facility capable of processing it, and the subsequent processing may be entrusted to the recovery facility.

[0064] Furthermore, components to be included in the vehicle-mounted section 3 and components to be included in the non-vehicle-mounted section 7 may be separated in ways different from those in the embodiments described above. For example, the water recovery sections 13A and 13B may be included in the vehicle-mounted section 3, and the downstream components from the CO2 recovery sections 15A and 15B onward may be included in the non-vehicle-mounted section 7.

[0065] Furthermore, multiple functions realized by one component as exemplified in the above embodiment may be realized by multiple components. One function realized by one component as exemplified in the above embodiment may be realized by multiple components. Multiple functions realized by multiple components as exemplified in the above embodiment may be realized by one component. One function realized by multiple components as exemplified in the above embodiment may be realized by one component. Some of the configurations exemplified in the above embodiment may be omitted. At least a part of the configuration exemplified in one of the above embodiments may be added to or replaced with the configuration exemplified in the other embodiments.

[0066] (8) The technical concept disclosed herein [Item 1] A CO2 recovery device that recovers CO2 from the exhaust gas of at least one vehicle's internal combustion engine, A CO2 recovery unit is configured to switch between at least an adsorption step and a regeneration step, and when switched to the adsorption step, introduces the exhaust gas and adsorbs the CO2 contained in the exhaust gas, and when switched to the regeneration step, desorbs the CO2 adsorbed in the adsorption step and discharges a CO2-containing gas containing that CO2, A CO2 storage unit is configured to store the CO2-containing gas discharged from the CO2 recovery unit, Equipped with, At least the CO2 storage unit is included in a non-vehicle unit that is not mounted on the vehicle, At least the exhaust gas emission point is included in the on-board unit mounted on the vehicle, A portion of the flow path from the discharge point through the CO2 recovery unit to the CO2 storage unit is comprised of at least one connecting pipe that connects the vehicle-mounted unit and the non-vehicle-mounted unit. CO2 capture device.

[0067] [Item 2] The CO2 capture device described in item 1, The CO2 recovery unit is included in the non-vehicle unit. CO2 capture device.

[0068] [Item 3] The CO2 capture device described in item 1, The CO2 recovery unit is included in the vehicle-mounted unit. CO2 capture device.

[0069] [Item 4] A CO2 recovery device described in any one of items 1 to 3, Upstream of the CO2 recovery unit, a water recovery unit is provided that introduces the exhaust gas and recovers the water contained in the exhaust gas. The water recovery unit is configured to allow the exhaust gas from which water has been recovered to be introduced into the CO2 recovery unit. CO2 capture device.

[0070] [Item 5] A CO2 recovery device described in any one of items 1 to 4, Downstream of the CO2 storage section, a CO2 purification section is provided to purify the CO2-containing gas stored in the CO2 storage section into CO2 of higher purity. CO2 capture device.

[0071] [Item 6] A CO2 recovery device described in any one of items 1 to 5, The aforementioned at least one vehicle is a plurality of vehicles, The aforementioned at least one connecting pipe is a plurality of connecting pipes, Each of the aforementioned multiple vehicles is configured to have an on-board section and one of the non-on-board sections connected via the aforementioned multiple connecting pipes. CO2 capture device. [Explanation of Symbols]

[0072] 1, 41, 51...CO2 recovery unit, 2...vehicle, 2A...discharge unit, 3...on-vehicle unit, 5, 65, 75, 85...recovery unit, 6, 66...storage unit, 7...non-vehicle unit, 8...connecting piping, 9...check valve, 11, 11A, 11B...heat exchanger, 13, 13A, 13B...water recovery unit, 15, 15A, 15B...CO2 recovery unit, 17, 19...pump, 33...CO2 storage unit, 21A, 21B, 21C, 21D, 21E, 21F, 21G, 21H...flow path, 23A, 23B, 23C, 23D, 23E, 23F...flow path switching valve, 31...dewatering unit, 35...filter, 37...CO2 purification unit.

Claims

1. A CO2 recovery device for recovering CO2 from the exhaust gas of at least one vehicle's internal combustion engine, A CO2 recovery unit is configured to switch between at least an adsorption step and a regeneration step, and when switched to the adsorption step, introduces the exhaust gas and adsorbs the CO2 contained in the exhaust gas, and when switched to the regeneration step, desorbs the CO2 adsorbed in the adsorption step and discharges a CO2-containing gas containing that CO2, A CO2 storage unit is configured to store the CO2-containing gas discharged from the CO2 recovery unit, Equipped with, At least the CO2 storage unit is included in a non-vehicle unit that is not mounted on the vehicle, At least the exhaust gas emission point is included in the on-board unit mounted on the vehicle, A portion of the flow path from the discharge point through the CO2 recovery section to the CO2 storage section is comprised of at least one connecting pipe that connects the vehicle-mounted section and the non-vehicle-mounted section. CO2 recovery device.

2. A CO2 recovery device according to claim 1, The CO2 recovery unit is included in the non-vehicle unit. CO2 recovery device.

3. A CO2 recovery device according to claim 1, The CO2 recovery unit is included in the vehicle-mounted unit. CO2 recovery device.

4. A CO2 recovery device according to any one of claims 1 to 3, Upstream of the CO2 recovery unit, a water recovery unit is provided that introduces the exhaust gas and recovers the water contained in the exhaust gas. The water recovery unit is configured to allow the exhaust gas from which water has been recovered to be introduced into the CO2 recovery unit. CO2 recovery device.

5. A CO2 recovery device according to any one of claims 1 to 3, Downstream of the CO2 storage section, a CO2 purification section is provided to introduce the CO2-containing gas stored in the CO2 storage section and purify it into CO2 of higher purity. CO2 recovery device.

6. A CO2 recovery device according to any one of claims 1 to 3, The aforementioned at least one vehicle is a plurality of vehicles, The aforementioned at least one connecting pipe is a plurality of connecting pipes, Each of the aforementioned multiple vehicles has an on-board section and one of the aforementioned non-on-board sections, which are configured to be connected via the aforementioned multiple connecting pipes. CO2 recovery device.

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