CO2 recovery device

Abstract

It is desirable to effectively remove H2O. [Solution] The CO2 recovery device comprises an H2O recovery unit, a CO2 recovery unit, a cooling unit, a flow path, a switching unit, and a control unit. The H2O recovery unit is configured to recover H2O from exhaust gas from an internal combustion engine. The CO2 recovery unit is configured to recover CO2 contained in the exhaust gas from which H2O has been recovered in the H2O recovery unit. In normal mode, the control unit allows exhaust gas cooled by the cooling unit to flow into the H2O recovery unit, and in exhaust gas desorption mode, it allows exhaust gas that has not been cooled by the cooling unit to flow into either the H2O recovery unit or the CO2 recovery unit.

Description

Technical Field

[0001] The present disclosure relates to a CO2 recovery device configured to recover CO2 from exhaust gas from an internal combustion engine.

Background Art

[0002] As described in Patent Document 1, a CO2 separation device for removing CO2 from exhaust gas from an internal combustion engine of a vehicle is known. The CO2 separation device includes a water adsorber and a CO2 adsorber. Exhaust gas from the internal combustion engine first flows into the water adsorber, and H2O contained in the exhaust gas is removed by an adsorbent in the water adsorber. Then, the exhaust gas that has passed through the water adsorber flows into the CO2 adsorber, and CO2 contained in the exhaust gas is removed by an adsorbent in the CO2 adsorber.

[0003] Further, the CO2 separation device includes a heat exchanger, and while heating the water adsorber and the CO2 adsorber with the heat exchanger, desorption of H2O from the water adsorber and desorption of CO2 from the CO2 adsorber are performed.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the CO2 separation device of Patent Document 1, the heat exchanger heats the water adsorbent from the outside of the water adsorber and the CO2 adsorbent from the outside of the CO2 adsorbent with the heat absorbed from the exhaust gas. Therefore, the water adsorbent and the CO2 adsorbent may not be heated well, and there is a risk that desorption of the water adsorbent and the CO2 adsorbent may not be effectively performed.

[0006] In one aspect of the present disclosure, it is desirable to effectively perform desorption of H2O. [Means for solving the problem]

[0007] One aspect of the present disclosure is a CO2 recovery device configured to recover CO2 from exhaust gas from an internal combustion engine, comprising: an H2O recovery unit; a CO2 recovery unit; a cooling unit; a flow path; a switching unit; and a control unit. The H2O recovery unit is configured to recover H2O from the exhaust gas by adsorbing H2O contained in the exhaust gas with an H2O adsorbent. The CO2 recovery unit is configured to recover CO2 from the exhaust gas from which H2O has been recovered by the H2O recovery unit by adsorbing CO2 contained in the exhaust gas with a CO2 adsorbent. The cooling unit is configured to cool the exhaust gas. The flow path allows the exhaust gas to flow down. The switching unit switches the path of the exhaust gas in the flow path. The control unit is configured to control the switching unit and is capable of switching between a normal mode and an exhaust gas desorption mode. Furthermore, in normal mode, the control unit controls the switching unit so that exhaust gas cooled by the cooling unit flows into the H2O recovery unit via the flow path, and exhaust gas from which H2O has been recovered in the H2O recovery unit flows into the CO2 recovery unit via the flow path. In exhaust gas desorption mode, the control unit controls the switching unit so that exhaust gas that has not been cooled by the cooling unit flows into either the H2O recovery unit or the CO2 recovery unit via the flow path.

[0008] With the above configuration, in exhaust gas desorption mode, the high-temperature exhaust gas that has not been cooled by the cooling unit is introduced into the H2O recovery unit or CO2 recovery unit, allowing H2O to be desorbed from the H2O adsorbent or CO2 adsorbent. Therefore, H2O can be effectively desorbed.

[0009] In one aspect of this disclosure, the control unit may control the switching unit so that, when in exhaust gas desorption mode, exhaust gas that is not cooled by the cooling unit flows into the H2O recovery unit through the flow path.

[0010] With the above configuration, in exhaust gas desorption mode, the high-temperature exhaust gas, which is not cooled by the cooling unit, is introduced into the H2O recovery unit, allowing H2O to be desorbed from the H2O adsorbent. Therefore, H2O can be effectively desorbed.

[0011] In one aspect of this disclosure, the flow path may have a cooling flow path and an uncooled flow path for introducing exhaust gas into the H2O recovery section. The switching section may be configured to switch the path of the exhaust gas flowing into the H2O recovery section. The cooling section may be configured to cool the exhaust gas flowing down the cooling flow path. In normal mode, the control unit may control the switching section so that the exhaust gas flows into the H2O recovery section via the cooling flow path. In exhaust gas desorption mode, the control unit may control the switching section so that the exhaust gas flows into the H2O recovery section via the uncooled flow path.

[0012] According to the above configuration, it is possible to suitably switch whether or not to cool the exhaust gas flowing into the H2O recovery unit. In one aspect of this disclosure, the flow path may have a cooling flow path that introduces exhaust gas into the H2O recovery section. The cooling section may be configured to blow air toward the cooling flow path. When in normal mode, the control unit may blow air toward the cooling flow path into the cooling section. When in exhaust gas desorption mode, the control unit may stop blowing air toward the cooling section.

[0013] With the above configuration, the exhaust gas can be suitably cooled in the cooling section, and it is possible to suitably switch whether or not to cool the exhaust gas flowing into the H2O recovery section. One aspect of this disclosure may further include a flow path for discharging exhaust gas flowing out of the H2O recovery unit and a connecting flow path connecting the H2O recovery unit and the CO2 recovery unit. The switching unit may be configured to switch the path of exhaust gas flowing out of the H2O recovery unit. In normal mode, the control unit may control the switching unit so that exhaust gas flowing out of the H2O recovery unit flows into the CO2 recovery unit via the connecting flow path. In exhaust gas desorption mode, the control unit may control the switching unit so that exhaust gas flowing out of the H2O recovery unit is discharged via the discharge flow path.

[0014] According to the above configuration, H2O detached from the H2O recovery unit can be suitably discharged. In one aspect of this disclosure, the control unit may control the switching unit so that, when in exhaust gas desorption mode, exhaust gas that is not cooled by the cooling unit flows into the CO2 recovery unit through the flow path.

[0015] With the above configuration, in exhaust gas desorption mode, the high-temperature exhaust gas, which has not been cooled by the cooling unit, is introduced into the CO2 recovery unit, allowing H2O to be desorbed from the CO2 adsorbent. Therefore, H2O can be effectively desorbed.

[0016] In one aspect of this disclosure, the flow path may have a cooling flow path and an uncooled flow path. The cooling flow path allows exhaust gas to flow into the H2O recovery section. The uncooled flow path allows exhaust gas to flow into the CO2 recovery section. The switching section may be configured to switch the path of the exhaust gas toward either the cooling flow path or the uncooled flow path. The cooling section may be configured to cool the exhaust gas flowing down the cooling flow path. In normal mode, the control unit may control the switching section so that the exhaust gas flows into the cooling flow path. In exhaust gas desorption mode, the control unit may control the switching section so that the exhaust gas flows into the uncooled flow path.

[0017] According to the above configuration, it is possible to suitably switch whether or not to cool the exhaust gas flowing into the H2O recovery unit. In one aspect of this disclosure, the flow path may further include an outlet flow path for discharging exhaust gas that has flowed out from the CO2 recovery unit. The control unit may control the switching unit so that, in normal mode and exhaust gas desorption mode, the exhaust gas that has flowed out from the CO2 recovery unit is discharged through the outlet flow path.

[0018] According to the above configuration, H2O removed from the CO2 recovery unit can be discharged effectively. One aspect of the present disclosure may further include a CO2 storage unit configured to store CO2 and a pump. The flow path may further have a storage flow path connecting the CO2 recovery unit and the CO2 storage unit. The pump may be provided in the storage flow path. The control unit may be configured to desorb CO2 from the CO2 adsorbent in the CO2 recovery unit through the storage flow path and cause the desorbed CO2 to flow into the CO2 storage unit by operating the pump.

[0019] According to the above configuration, CO2 can be preferably desorbed from the CO2 recovery unit.

Brief Description of Drawings

[0020] [Figure 1] FIG. 1A is an explanatory diagram of the CO2 recovery apparatus of the first embodiment in the normal mode. FIG. 1B is an explanatory diagram of the CO2 recovery apparatus of the first embodiment in the exhaust gas desorption mode. [Figure 2] FIG. 2A is an explanatory diagram of the CO2 recovery apparatus of the second embodiment in the normal mode. FIG. 2B is an explanatory diagram of the CO2 recovery apparatus of the second embodiment in the exhaust gas desorption mode. [Figure 3] An explanatory diagram of the CO2 recovery apparatus of the third embodiment in the normal mode. [Figure 4] An explanatory diagram of the CO2 recovery apparatus of the third embodiment in the exhaust gas desorption mode.

Modes for Carrying Out the Invention

[0021] Hereinafter, exemplary embodiments of the present disclosure will be described with reference to the drawings. [1. First Embodiment] [(1) Overview] The CO2 recovery device 1 of the first embodiment is mounted on a vehicle or construction machine equipped with an internal combustion engine and is configured to recover CO2 from exhaust gas emitted from the internal combustion engine (see Figures 1A and 1B). The vehicle or construction machine may, for example, be powered solely by an internal combustion engine, or by both an internal combustion engine and a motor. Of course, the CO2 recovery device 1 may also be mounted on a machine equipped with an internal combustion engine other than a vehicle or construction machine. The CO2 recovery device 1 comprises a cooling unit 2, an H2O recovery unit 3, a CO2 recovery unit 4, a CO2 storage unit 5, a pump 6, and a control unit 7.

[0022] [(2) Configuration of the flow path] The CO2 recovery device 1 comprises first to seventh flow paths P01 to P07, which are gas flow paths formed by members such as pipes, and first to fifth valves V01 to V05, which are switching units that switch the path of the gas flowing down the flow paths (see Figures 1A and 1B). For example, the first to third valves V01 to V03 are configured as three-way valves. For example, the fourth and fifth valves V04 and V05 are configured as two-way valves that adjust the opening degree of the flow paths.

[0023] The first flow path P01 receives exhaust gas from the internal combustion engine from its starting point, and its end is connected to the first valve V01. The second flow path P02 has its starting end connected to the first valve V01 and its ending end connected to the second valve V02. A cooling section 2 is also provided in the second flow path P02.

[0024] The third flow path P03 has its starting end connected to the first valve V01 and its ending end connected to the second valve V02. The fourth channel P04 has its starting end connected to the second valve V02 and its ending end connected to the third valve V03. Additionally, an H2O recovery section 3 is provided in the fourth channel P04.

[0025] The fifth channel P05 has its starting end connected to the third valve V03 and its end open to the outside of the vehicle or construction machine. The fifth channel P05 is also equipped with a CO2 recovery unit 4, and a fourth valve V04 is provided between the CO2 recovery unit 4 and the end of the fifth channel P05.

[0026] The sixth flow path P06 has its starting end connected to the third valve V03 and its end open to the outside of the vehicle or construction machine. The seventh channel P07 has its starting end connected to the CO2 recovery unit 4 and its ending end connected to the CO2 storage unit 5. The seventh channel P07 is also equipped with a fifth valve V05, and a pump 6 is provided between the fifth valve V05 and the CO2 storage unit 5.

[0027] [(3) Cooling section] The cooling unit 2 is configured, for example, to cool the exhaust gas flowing down the second flow path P02 by exchanging heat between the refrigerant and the exhaust gas (see Figures 1A and 1B). The cooling unit 2 may use a dedicated refrigerant, or it may use a refrigerant used in other devices mounted on the vehicle or construction machinery. Furthermore, the cooling unit 2 may cool the exhaust gas by exchanging heat with the atmosphere.

[0028] [(4) H2O Recovery Section] The H2O recovery unit 3 is equipped with an H2O adsorbent such as silica gel, zeolite, or activated alumina, and recovers H2O from the exhaust gas by adsorbing the H2O contained in the exhaust gas flowing in from the fourth channel P04 with the H2O adsorbent (see Figures 1A and 1B). The H2O recovery unit 3 then discharges the exhaust gas from which H2O has been recovered into the fourth channel P04.

[0029] In other words, the H2O recovery unit 3 removes H2O from the exhaust gas from which CO2 is recovered in the CO2 recovery unit 4. This prevents the H2O in the exhaust gas from being adsorbed by the CO2 adsorbent in the CO2 recovery unit 4, thus suppressing a decrease in the CO2 adsorption effect of the CO2 adsorbent.

[0030] [(5) CO2 Recovery Section] The CO2 recovery unit 4 is equipped with a CO2 adsorbent such as zeolite, MOF (Metal Organic Frameworks), activated carbon, magnesium oxide, solid amine, or calcium oxide (see Figures 1A and 1B). The CO2 recovery unit 4 recovers CO2 from the exhaust gas by adsorbing the CO2 contained in the exhaust gas flowing in from the fifth channel P05 using the CO2 adsorbent. The CO2 recovery unit 4 then discharges the exhaust gas from which CO2 has been recovered back into the fifth channel P05.

[0031] [(6) CO2 storage section] The CO2 storage unit 5 is configured to store the CO2 recovered from the exhaust gas in the CO2 recovery unit 4 (see Figures 1A and 1B). The CO2 storage unit 5 may, for example, be equipped with a CO2 adsorbent similar to that of the CO2 recovery unit 4, and store CO2 by adsorbing it onto the CO2 adsorbent, or it may be configured as a cylinder.

[0032] [(7) Pump] Pump 6 is configured to desorb CO2 adsorbed on the CO2 adsorbent in the CO2 recovery unit 4 and store the desorbed CO2 in the CO2 storage unit 5 (see Figures 1A and 1B). Pump 6 depressurizes the space where the CO2 adsorbent is located in the CO2 recovery unit 4 via the seventh flow path P07, thereby creating a vacuum and desorbing CO2 from the CO2 adsorbent. Pump 6 then causes the desorbed CO2 to flow into the CO2 storage unit 5 via the seventh flow path P07, and stores the CO2 in the CO2 storage unit 5.

[0033] [(8) Control Unit] The control unit 7 is configured to control various parts of the CO2 recovery device 1, such as the first to fifth valves V01 to V05 and the pump 6, by transmitting signals to these parts, and includes a CPU and memory (see Figures 1A and 1B). The CPU executes a program stored in the memory, thereby realizing various functions of the CO2 recovery device 1. Note that the various functions realized by the control unit 7 are not limited to being realized by program execution; some or all of them may be realized using one or more hardware components.

[0034] [(9) Processing of CO2 recovery equipment] The CO2 recovery device 1 has a normal mode and an exhaust gas desorption mode. In the normal mode, H2O is recovered from the exhaust gas cooled by the cooling unit 2 in the H2O recovery unit 3, and then CO2 is recovered from the exhaust gas from which H2O has been recovered in the CO2 recovery unit 4 (see Figure 1A). The exhaust gas from which CO2 has been recovered is then discharged to the outside of the vehicle or construction machine.

[0035] On the other hand, in exhaust gas desorption mode, H2O is desorbed from the H2O adsorbent in the H2O recovery unit 3, and CO2 is desorbed from the CO2 adsorbent in the CO2 recovery unit 4, while the desorbed CO2 is stored in the CO2 storage unit 5 (see Figure 1B).

[0036] The control unit 7 is capable of switching between a normal mode and an exhaust gas desorption mode. For example, while a vehicle or construction machine is in operation, the control unit 7 may alternate between the normal mode and the exhaust gas desorption mode to continuously recover CO2 from the exhaust gas. Alternatively, for example, the control unit 7 may switch between the normal mode and the exhaust gas desorption mode according to an operation received from the user via an operation unit (not shown).

[0037] <Processing in normal mode> When the control unit 7 switches to normal mode, it controls the first valve V01 to connect the end of the first flow path P01 to the beginning of the second flow path P02, and closes the beginning of the third flow path P03 (see Figure 1A). The control unit 7 also controls the second valve V02 to connect the end of the second flow path P02 to the beginning of the fourth flow path P04, and closes the end of the third flow path P03. The control unit 7 also controls the third valve V03 to connect the end of the fourth flow path P04 to the beginning of the fifth flow path P05, and closes the beginning of the sixth flow path P06. The control unit 7 also opens the fourth valve V04 and closes the fifth valve V05.

[0038] As a result, the exhaust gas flowing into the first flow path P01 passes through the first valve V01 and flows into the second flow path P02, and then into the cooling section 2. The exhaust gas cooled in the cooling section 2 then passes through the second flow path P02, the second valve V02, and the fourth flow path P04 and flows into the H2O recovery section 3. In the H2O recovery section 3, H2O is recovered from the exhaust gas by adsorbing H2O with an H2O adsorbent, and then the exhaust gas from which H2O has been recovered passes through the fourth flow path P04, the third valve V03, and the fifth flow path P05 and flows into the CO2 recovery section 4. In the CO2 recovery section 4, CO2 is recovered from the exhaust gas by adsorbing CO2 with a CO2 adsorbent, and then the exhaust gas passes through the fifth flow path P05 and is discharged to the outside of the vehicle or construction machine.

[0039] <Processing in exhaust gas desorption mode> When the control unit 7 enters exhaust gas desorption mode, it controls the first valve V01 to connect the end of the first flow path P01 to the beginning of the third flow path P03 and closes the beginning of the second flow path P02 (see Figure 1B). The control unit 7 also controls the second valve V02 to connect the end of the third flow path P03 to the beginning of the fourth flow path P04 and closes the end of the second flow path P02. The control unit 7 also controls the third valve V03 to connect the end of the fourth flow path P04 to the beginning of the sixth flow path P06 and closes the beginning of the fifth flow path P05. The control unit 7 also closes the fourth valve V04 and opens the fifth valve V05. The control unit 7 also operates the pump 6.

[0040] As a result, the exhaust gas flowing into the first flow path P01 passes through the first valve V01 and flows into the third flow path P03, then through the second valve V02 and the fourth flow path P04 and flows into the H2O recovery unit 3. In other words, the exhaust gas is not cooled in the cooling unit 2, and high-temperature exhaust gas flows into the H2O recovery unit 3. In the H2O recovery unit 3, H2O is detached from the H2O adsorbent by the high-temperature exhaust gas, and the detached H2O flows out of the H2O recovery unit 3 along with the exhaust gas. The exhaust gas that flows out of the H2O recovery unit 3 then passes through the third valve V03 and the sixth flow path P06 and is discharged to the outside of the vehicle or construction machine.

[0041] Furthermore, the operation of pump 6 reduces the pressure in the CO2 recovery unit 4 via the seventh flow path P07, causing CO2 to detach from the CO2 adsorbent. The detached CO2 then flows into the CO2 storage unit 5 and is stored there.

[0042] [2. Second Embodiment] [(1) Overview] The CO2 recovery device 1 of the second embodiment differs from the first embodiment in the configuration of the cooler and the configuration of the flow path (see Figures 2A and 2B). The differences between the CO2 recovery device 1 of the second embodiment and the first embodiment will be described below.

[0043] [(2) Configuration of the flow path] The CO2 recovery device 1 comprises first to fourth flow paths P11 to P14, which are gas flow paths, and first to third valves V11 to V13, which are switching units that switch the path of the gas flowing down the flow paths (see Figures 2A and 2B). The first valve V11 is configured as a three-way valve, for example. The second and third valves V12 and V13 are configured as two-way valves that adjust the opening degree of the flow paths.

[0044] The first flow path P11 receives exhaust gas from the internal combustion engine from its starting point, and its end is connected to the first valve V11. The first flow path P11 is also provided with a cooling flow path 20, and an H2O recovery unit 3 is provided between the cooling flow path 20 and the first valve V11.

[0045] The second flow path P12 has its starting end connected to the first valve V11 and its ending end open to the outside of the vehicle or construction machine. The third flow path P13 has its starting end connected to the first valve V11 and its ending end open to the outside of the vehicle or construction machine.

[0046] The fourth channel P14 has its starting end connected to the CO2 recovery unit 4 and its ending end connected to the CO2 storage unit 5. Furthermore, the fourth channel P14 is equipped with a third valve V13, and a pump 6 is provided between the third valve V13 and the CO2 storage unit 5.

[0047] [(3) Cooling section] The cooling unit 2 of the second embodiment has a cooling channel 20 and a fan 21 provided in the first flow path P11 (see Figures 2A and 2B).

[0048] The fan 21 is configured to blow air toward the cooling channel 20, thereby promoting the cooling of the exhaust gas flowing down the cooling channel 20. Specifically, for example, air may be blown from the fan 21 toward the cooling channel 20, or the air blown toward the fan 21 may be directed toward the cooling channel 20. The cooling channel 20 has multiple sub-channels, and the exhaust gas that reaches the cooling channel 20 flows into each sub-channel, and each sub-channel merges at the end of the cooling channel 20.

[0049] For example, the multiple sub-channels have a flattened shape, which promotes heat dissipation of the exhaust gas flowing down each sub-channel, and the airflow from the fan 21 further cools the exhaust gas flowing down each sub-channel. For example, the outer surface of the sub-channels may be made uneven or protruding to further promote heat dissipation in the sub-channels.

[0050] [(4) Control Unit] The control unit 7 differs from the first embodiment in that it controls each part of the CO2 recovery device 1, such as the fan 21, the first to third valves V11 to V13, and the pump 6, by transmitting signals to these parts (see Figures 2A and 2B).

[0051] [(5) Processing of CO2 recovery equipment] The CO2 recovery device 1 of the second embodiment also has a normal mode and an exhaust gas desorption mode, similar to the first embodiment (see Figures 2A and 2B). However, the control of valves and the like in each mode differs from that of the first embodiment.

[0052] <Processing in normal mode> When the control unit 7 switches to normal mode, it controls the first valve V11 to connect the end of the first flow path P11 to the beginning of the second flow path P12, and closes the beginning of the third flow path P13 (see Figure 2A). The control unit 7 also opens the second valve V12 and closes the third valve V13. The control unit 7 also operates the fan 21 to cool the exhaust gas in the cooling unit 2.

[0053] As a result, the exhaust gas flowing into the first flow path P11 is cooled by the fan 21 as it flows down the cooling flow path 20, and then flows into the H2O recovery unit 3. In the H2O recovery unit 3, H2O is recovered from the exhaust gas by adsorbing H2O with an H2O adsorbent, and then the exhaust gas from which H2O has been recovered passes through the first flow path P11, the first valve V11, and the second flow path P12 and flows into the CO2 recovery unit 4. In the CO2 recovery unit 4, CO2 is recovered from the exhaust gas by adsorbing CO2 with a CO2 adsorbent, and then the exhaust gas passes through the second flow path P12 and is discharged to the outside of the vehicle or construction machine.

[0054] <Processing in exhaust gas desorption mode> When the control unit 7 enters exhaust gas desorption mode, it controls the first valve V11 to connect the end of the first flow path P11 to the beginning of the third flow path P13, and closes the beginning of the second flow path P12 (see Figure 2B). The control unit 7 also closes the second valve V12 and opens the third valve V13. Furthermore, the control unit 7 stops the fan 21 to prevent exhaust gas cooling in the cooling unit 2. Finally, the control unit 7 operates the pump 6.

[0055] As a result, the exhaust gas flowing into the first flow path P11 flows into the H2O recovery unit 3 at a high temperature without being cooled in the cooling flow path 20. In the H2O recovery unit 3, the high temperature exhaust gas causes H2O to detach from the H2O adsorbent, and the detached H2O flows out of the H2O recovery unit 3 along with the exhaust gas. The exhaust gas flowing out of the H2O recovery unit 3 then passes through the first flow path P11, the first valve V11, and the third flow path P13 and is discharged to the outside of the vehicle or construction machine.

[0056] Furthermore, similar to the first embodiment, the operation of the pump 6 reduces the pressure in the CO2 recovery unit 4 via the fourth flow path P14, causing CO2 to detach from the CO2 adsorbent. The detached CO2 then flows into the CO2 storage unit 5 and is stored there.

[0057] [3. Third Embodiment] [(1) Overview] The CO2 recovery device 1 of the third embodiment differs from the first embodiment in that it has two H2O recovery units configured in the same way as the first embodiment, and two CO2 recovery units configured in the same way as the first embodiment (see Figures 3 and 4). Furthermore, the CO2 recovery device 1 of the third embodiment differs from the first embodiment in that it has a first pump 6A and in the configuration of the flow path. In addition, the CO2 recovery device 1 of the third embodiment differs from the first embodiment in that it has both a normal mode and an exhaust gas desorption mode.

[0058] In other words, the CO2 recovery device 1 of the third embodiment comprises first and second H2O recovery units 3A and 3B, first and second CO2 recovery units 4A and 4B, a first pump 6A, and a second pump 6B configured similarly to the pump 6 of the first embodiment. The differences between the CO2 recovery device 1 of the third embodiment and the first embodiment will be described below.

[0059] [(2) Configuration of the flow path] The CO2 recovery device 1 comprises the first to eleventh flow paths P21 to P31, which are gas flow paths, and a switching unit that switches the path of the gas flowing down the flow paths, which for example comprises the first to seventh valves V21 to V27 configured as three-way valves (see Figures 3 and 4).

[0060] The first flow path P21 receives exhaust gas from the internal combustion engine from its starting point, and its end is connected to the first valve V21. The second flow path P22 has its starting end connected to the first valve V21 and its ending end connected to the second valve V22. A cooling section 2 is also provided in the second flow path P22.

[0061] The third A channel P23A has its starting end connected to the second valve V22 and its ending end connected to the third valve V23. The third A channel P23A is also provided with the first H2O recovery section 3A.

[0062] The third B channel P23B has its starting end connected to the second valve V22 and its ending end connected to the third valve V23. The third B channel P23B is also provided with a second H2O recovery section 3B.

[0063] The fourth channel P24A has its starting end connected to the first H2O recovery section 3A and its end connected to the fourth valve V24. The fourth B channel P24B has its starting end connected to the second H2O recovery section 3B and its ending end connected to the fourth valve V24.

[0064] The fifth flow path P25 has its starting end connected to the fourth valve V24 and its end open to the outside of the vehicle or construction machine. The first pump 6A is also provided in the fifth flow path P25. The sixth flow path P26 has its starting end connected to the third valve V23 and its ending end connected to the fifth valve V25.

[0065] The 7th channel P27A has its starting end connected to the 5th valve V25 and its ending end connected to the 6th valve V26. The 7th channel P27A is also provided with the 1st CO2 recovery section 4A.

[0066] The 7th B channel P27B has its starting end connected to the 5th valve V25 and its ending end connected to the 6th valve V26. The 7th B channel P27B is also provided with a 2nd CO2 recovery section 4B.

[0067] The 8th channel P28A has its starting end connected to the 1st CO2 recovery unit 4A and its ending end connected to the 7th valve V27. The 8th B channel P28B has its starting end connected to the 2nd CO2 recovery section 4B and its ending end connected to the 7th valve V27.

[0068] The ninth channel P29 has its starting end connected to the seventh valve V27 and its end connected to the CO2 storage unit 5. The second pump 6B is also provided in the ninth channel P29. The tenth flow path P30 has its starting end connected to the sixth valve V26 and its end is open to the outside of the vehicle or construction machine.

[0069] The 11th channel P31 has its starting end connected to the 1st valve V21 and its end merges with the 6th channel P26. [(3) First and second pumps] The first pump 6A is configured to desorb H2O adsorbed on the H2O adsorbent in the H2O recovery unit 3 and discharge the desorbed H2O to the outside of the vehicle or construction machine via the fifth flow path P25 (see Figures 3 and 4). The first pump 6A depressurizes the space where the H2O adsorbent is located in the first or second H2O recovery unit 3A or 3B via the fourth A or fourth B flow paths P24A and P24B, thereby creating a vacuum and desorbing H2O from the H2O adsorbent. The first pump 6A then discharges the desorbed H2O to the outside of the vehicle or construction machine via the fifth flow path P25.

[0070] Furthermore, the second pump 6B is configured in the same way as the pump 6 of the first embodiment, and, as will be described later, it desorbs CO2 from the CO2 adsorbent provided in the first or second CO2 recovery unit 4A, 4B.

[0071] [(4) Processing of CO2 recovery equipment] In the third embodiment, the control unit 7 is capable of switching between a normal mode and an exhaust gas desorption mode (see Figures 3 and 4). In the normal mode, H2O recovery and desorption of H2O adsorbed in the H2O recovery unit are performed in parallel, as are CO2 recovery and desorption of CO2 adsorbed in the CO2 recovery unit. In the exhaust gas desorption mode, uncooled exhaust gas is used to desorb H2O adsorbed in the first or second CO2 recovery unit 4A or 4B.

[0072] For example, while a vehicle or construction machine is in operation, the control unit 7 may alternate between normal mode and exhaust gas desorption mode to continuously recover CO2 from the exhaust gas. Alternatively, for example, the control unit 7 may switch between normal mode and exhaust gas desorption mode according to an operation received from the user via an operation unit (not shown).

[0073] The following sections will provide a detailed explanation of the normal mode and the exhaust gas desorption mode. [(5) Processing in normal mode] <Adsorption state and desorption state> In normal mode, the control unit 7 sets one of the first and second H2O recovery units 3A and 3B to an adsorption state and the other to a desorption state, and switches between the adsorption and desorption states of the H2O recovery unit at a predetermined switching timing (see Figure 3). Similarly, the control unit 7 sets one of the first and second CO2 recovery units 4A and 4B to an adsorption state and the other to a desorption state, and switches between the adsorption state of the CO2 recovery unit at a predetermined switching timing.

[0074] Then, in the H2O recovery section, which is in an adsorption state, H2O is recovered from the exhaust gas, and in the CO2 recovery section, which is in an adsorption state, CO2 is recovered from the exhaust gas. Meanwhile, in the H2O recovery section, which is in a desorption state, H2O is desorbed by the first pump 6A, and in the CO2 recovery section, which is in a desorption state, CO2 is desorbed by the second pump 6B.

[0075] <Switching timing> The switching timing of the H2O recovery unit may be the timing when the remaining amount of H2O that can be adsorbed in the H2O recovery unit in the adsorption state decreases (see Fig. 3). Specifically, for example, based on the amount of the H2O adsorbent provided in each H2O recovery unit, the operating time (upper limit time) of the H2O recovery unit when it is estimated that the remaining amount of H2O that can be adsorbed decreases may be determined in advance. Then, after newly setting the H2O recovery unit to the adsorption state, the timing when the operating time of the H2O recovery unit reaches the upper limit time may be used as the switching timing. Also, for example, the control unit 7 may detect the concentration of H2O contained in the exhaust gas in the flow path on the downstream side of the H2O recovery unit in the adsorption state by a sensor, and the timing when the concentration becomes equal to or higher than the threshold value may be used as the switching timing.

[0076] Also, the switching timing of the CO2 recovery unit may also be the timing when the remaining amount of CO2 that can be adsorbed in the CO2 recovery unit in the adsorption state decreases. Specifically, for example, similar to the H2O recovery unit, the switching timing may be determined based on the operating time of the CO2 recovery unit or the CO2 concentration of the exhaust gas in the flow path of the CO2 recovery unit in the adsorption state measured by a sensor.

[0077] <Cycle of H2O recovery unit> When the first H2O recovery unit 3A is in the adsorption state and the second H2O recovery unit 3B is in the desorption state (hereinafter, the first cycle), the control unit 7 controls the valves as follows (see Fig. 3).

[0078] That is, the first valve V21 connects the end of the first flow path P21 and the start of the second flow path P22, and closes the start of the eleventh flow path P31. Also, the second valve V22 connects the end of the second flow path P22 and the start of the 3A flow path P23A, and closes the start of the 3B flow path P23B. Also, the third valve V23 connects the end of the 3A flow path P23A and the start of the sixth flow path P26, and closes the end of the 3B flow path P23B. Also, the fourth valve V24 connects the end of the 4B flow path P24B and the start of the fifth flow path P25, and closes the end of the 4A flow path P24A.

[0079] On the other hand, when the first H2O recovery unit 3A is in an adsorption state and the second H2O recovery unit 3B is in a desorption state (hereafter referred to as the second cycle), the control unit 7 controls the valve as follows. The first valve V21 remains in the same state as in the first cycle. Meanwhile, the second valve V22 connects the end of the second flow path P22 to the beginning of the third B flow path P23B, and closes the beginning of the third A flow path P23A. The third valve V23 connects the end of the third B flow path P23B to the beginning of the sixth flow path P26, and closes the end of the third A flow path P23A. The fourth valve V24 connects the end of the fourth A flow path P24A to the beginning of the fifth flow path P25, and closes the end of the fourth B flow path P24B.

[0080] Therefore, in the first cycle, the exhaust gas that has passed through the first flow path P21 passes through the first valve V21 and the second flow path P22 to reach the cooling section 2, where it is cooled. After that, the exhaust gas passes through the second flow path P22, the second valve V22, and the third A flow path P23A, and flows into the first H2O recovery section 3A, where the H2O is in an adsorbed state. Then, after H2O is recovered in the first H2O recovery section 3A, the exhaust gas flows out of the first H2O recovery section 3A and passes through the third A flow path P23A, the third valve V23, and the sixth flow path P26.

[0081] Furthermore, after the start of the first cycle, when the control unit 7 operates the first pump 6A, H2O adsorbed on the H2O adsorbent in the second H2O recovery unit 3B is desorbed. Specifically, the first pump 6A depressurizes the space where the H2O adsorbent is located in the second H2O recovery unit 3B via the fifth flow path P25 and the fourth B flow path P24B, thereby creating a vacuum and desorbing H2O from the H2O adsorbent. The first pump 6A then discharges the desorbed H2O to the outside of the vehicle or construction machine via the fifth flow path P25.

[0082] On the other hand, in the second cycle, the exhaust gas that has passed through the first flow path P21 is cooled in the cooling unit 2 in the same manner as in the first cycle, then passes through the second valve V22 and the third B flow path P23B, and flows into the second H2O recovery unit 3B in the adsorption state. Then, after H2O is recovered in the second H2O recovery unit 3B, the exhaust gas flows out from the second H2O recovery unit 3B and passes through the third B flow path P23B, the third valve V23, and the sixth flow path P26.

[0083] Also, after the start of the second cycle, when the control unit 7 operates the first pump 6A, the H2O adsorbed on the H2O adsorbent in the first H2O recovery unit 3A is desorbed. Specifically, the first pump 6A depressurizes the first H2O recovery unit 3A via the fifth flow path P25 and the fourth A flow path P24A in the same manner as in the first cycle, and desorbs H2O from the H2O adsorbent. Then, the first pump 6A discharges the desorbed H2O to the outside of the vehicle or construction machine via the fifth flow path P25.

[0084] <Cycle of CO2 recovery unit> When the first CO2 recovery unit 4A is in the adsorption state and the second CO2 recovery unit 4B is in the desorption state (hereinafter, the first cycle), the control unit 7 controls the valves as follows (see FIG. 3).

[0085] That is, the fifth valve V25 connects the end of the sixth flow path P26 and the start of the seventh A flow path P27A, and closes the start of the seventh B flow path P27B. Also, the sixth valve V26 connects the end of the seventh A flow path P27A and the start of the tenth flow path P30, and closes the end of the seventh B flow path P27B. Also, the seventh valve V27 connects the end of the eighth B flow path P28B and the start of the ninth flow path P29, and closes the end of the eighth A flow path P28A.

[0086] On the other hand, when the second CO2 recovery unit 4B is in the adsorption state and the first CO2 recovery unit 4A is in the desorption state (hereinafter, the second cycle), the control unit 7 controls the valves as follows. Specifically, the fifth valve V25 connects the end of the sixth flow path P26 to the beginning of the seventh B flow path P27B, and closes the beginning of the seventh A flow path P27A. Also, the sixth valve V26 connects the end of the seventh B flow path P27B to the beginning of the tenth flow path P30, and closes the end of the seventh A flow path P27A. Furthermore, the seventh valve V27 connects the end of the eighth A flow path P28A to the beginning of the ninth flow path P29, and closes the end of the eighth B flow path P28B.

[0087] Therefore, in the first cycle, the exhaust gas that has passed through the sixth passage P26 passes through the fifth valve V25 and the seventh A passage P27A and flows into the first CO2 recovery unit 4A, which is in an adsorbed state. After CO2 is recovered in the first CO2 recovery unit 4A, the exhaust gas flows out of the first CO2 recovery unit 4A, passes through the seventh A passage P27A, the sixth valve V26, and the tenth passage P30, and is discharged to the outside of the vehicle or construction machine.

[0088] Furthermore, after the start of the first cycle, when the control unit 7 operates the second pump 6B, the CO2 adsorbed on the CO2 adsorbent in the second CO2 recovery unit 4B is desorbed. Specifically, the second pump 6B depressurizes the space where the CO2 adsorbent is located in the second CO2 recovery unit 4B via the ninth flow path P29 and the eighth flow path P28B, thereby creating a vacuum and desorbing CO2 from the CO2 adsorbent. The second pump 6B then stores the desorbed CO2 in the CO2 storage unit 5 via the ninth flow path P29.

[0089] Meanwhile, in the second cycle, the exhaust gas that has passed through the sixth passage P26 passes through the fifth valve V25 and the seventh passage P27B, and flows into the second CO2 recovery unit 4B, which is in an adsorbed state. After CO2 is recovered in the second CO2 recovery unit 4B, the exhaust gas flows out of the second CO2 recovery unit 4B, passes through the seventh passage P27B, the sixth valve V26, and the tenth passage P30, and is discharged to the outside of the vehicle or construction machine.

[0090] Furthermore, after the start of the second cycle, when the control unit 7 operates the second pump 6B, the CO2 adsorbed on the CO2 adsorbent in the first CO2 recovery unit 4A is desorbed. Specifically, the second pump 6B depressurizes the first CO2 recovery unit 4A via the ninth flow path P29 and the 8A flow path P28A, in the same manner as in the first cycle, and desorbs CO2 from the CO2 adsorbent. The second pump 6B then stores the desorbed CO2 in the CO2 storage unit 5 via the ninth flow path P29.

[0091] [(6) Processing in exhaust gas desorption mode] In exhaust gas desorption mode, one of the first and second CO2 recovery units 4A and 4B enters a desorption state in which H2O is desorbed (see Figure 4). Uncooled exhaust gas flows into the CO2 recovery unit in the desorption state, and H2O is desorbed.

[0092] <When the first CO2 recovery unit is detached> When the control unit 7 switches to the exhaust gas desorption mode, which puts the first CO2 recovery unit 4A into a desorption state, it controls the valve as follows (see Figure 4).

[0093] Specifically, the first valve V21 connects the end of the first flow path P21 to the beginning of the eleventh flow path P31 and closes the beginning of the second flow path P22. The third valve V23 closes the beginning of the sixth flow path P26. The fifth valve V25 connects the end of the sixth flow path P26 to the beginning of the seventh A flow path P27A and closes the beginning of the seventh B flow path P27B. The sixth valve V26 connects the end of the seventh A flow path P27A to the beginning of the tenth flow path P30 and closes the end of the seventh B flow path P27B. The seventh valve V27 closes the end of the eighth A flow path P28A.

[0094] The exhaust gas that flows into the first flow path P21 then passes through the first valve V21, the eleventh flow path P31, the sixth flow path P26, the fifth valve V25, and the seventh A flow path P27A before flowing into the first CO2 recovery unit 4A. In other words, the exhaust gas is not cooled in the cooling unit 2, and high-temperature exhaust gas flows into the first CO2 recovery unit 4A. In the first CO2 recovery unit 4A, H2O is detached from the CO2 adsorbent by the high-temperature exhaust gas, and the detached H2O flows out of the first CO2 recovery unit 4A along with the exhaust gas. The exhaust gas that flows out of the first CO2 recovery unit 4A then passes through the seventh A flow path P27A, the sixth valve V26, and the tenth flow path P30 before being discharged to the outside of the vehicle or construction machine.

[0095] <When the second CO2 recovery unit is detached> When the control unit 7 switches to the exhaust gas desorption mode, which puts the second CO2 recovery unit 4B into a desorption state, it controls the valve as follows (see Figure 4).

[0096] In other words, the first and third valves V21 and V23 are the same as when the first CO2 recovery unit 4A is in a deactivated state. The fifth valve V25 connects the end of the sixth flow path P26 to the beginning of the seventh B flow path P27B and closes the beginning of the seventh A flow path P27A. The sixth valve V26 also connects the end of the seventh B flow path P27B to the beginning of the tenth flow path P30 and closes the end of the seventh A flow path P27A. The seventh valve V27 also closes the end of the eighth B flow path P28B.

[0097] The exhaust gas that flows into the first flow path P21 then passes through the first valve V21, the eleventh flow path P31, the sixth flow path P26, the fifth valve V25, and the seventh B flow path P27B, and flows into the second CO2 recovery section 4B without being cooled in the cooling section 2. In the second CO2 recovery section 4B, H2O is detached from the CO2 adsorbent by the high-temperature exhaust gas, and the detached CO2 flows out of the second CO2 recovery section 4B along with the exhaust gas. The exhaust gas that flows out of the second CO2 recovery section 4B then passes through the seventh B flow path P27B, the sixth valve V26, and the tenth flow path P30, and is discharged to the outside of the vehicle or construction machine.

[0098] <Variation> In the exhaust gas desorption mode, even if both the first and second CO2 recovery units 4A and 4B are in the desorption state (see Fig. 4). In this case, the exhaust gas that has passed through the 11th flow path P31 flows into the first and second CO2 recovery units 4A and 4B while still being at a high temperature through the 7Ath flow path P27A and the 7Bth flow path P27B. Then, in both the first and second CO2 recovery units 4A and 4B, H2O is desorbed from the CO2 adsorbent, and the desorbed CO2 flows out of the first and second CO2 recovery units 4A and 4B together with the exhaust gas. Then, the exhaust gas flowing out of the first and second CO2 recovery units 4A and 4B passes through the 6th valve V26 and the 10th flow path P30 and is discharged to the outside of the vehicle or construction machine.

[0099] <Treatment in the H2O recovery unit> In the exhaust gas desorption mode, the control unit 7 may desorb H2O in both or one of the first and second H2O recovery units 3A and 3B by the first pump 6A (see Fig. 4).

[0100] When the control unit 7 desorbs H2O from the first H2O recovery unit 3A, the control unit 7 further controls the second to fourth valves V22 to V24 in the same manner as in the second cycle of the normal mode. Then, the control unit 7 depressurizes the first H2O recovery unit 3A by the first pump 6A in the same manner as in the second cycle of the normal mode, desorbs H2O from the H2O adsorbent in the first H2O recovery unit 3A, and discharges the desorbed H2O to the outside of the vehicle or construction machine.

[0101] On the other hand, when the control unit 7 desorbs H2O from the second H2O recovery unit 3B, the control unit 7 further controls the second to fourth valves V22 to V24 in the same manner as in the first cycle of the normal mode. Then, the control unit 7 depressurizes the second H2O recovery unit 3B by the first pump 6A in the same manner as in the first cycle of the normal mode, desorbs H2O from the H2O adsorbent in the second H2O recovery unit 3B, and discharges the desorbed H2O to the outside of the vehicle or construction machine.

[0102] Note that the control unit 7 may depressurize the first and second H2O recovery units 3A and 3B simultaneously by the first pump 6A and desorb H2O from the H2O adsorbents accumulated therein.

[0103] [4. Effects] (1) According to the first and second embodiments, in exhaust gas desorption mode, the high-temperature exhaust gas that has not been cooled by the cooling unit 2 is introduced into the H2O recovery unit 3, and H2O can be desorbed from the H2O adsorbent. Therefore, H2O can be desorbed effectively.

[0104] (2) According to the first and second embodiments, the control unit 7 can switch whether or not the exhaust gas passes through the cooling unit 2 by controlling the first and second valves to switch the flow path of the exhaust gas. Therefore, it is possible to suitably switch whether or not to cool the exhaust gas flowing into the H2O recovery unit 3.

[0105] (3) According to the second embodiment, the cooling unit 2 cools the exhaust gas by blowing air toward the cooling passage 20 with the fan 21. Therefore, the exhaust gas can be suitably cooled in the cooling unit 2, and by turning the fan 21 ON / OFF, it is possible to suitably switch whether or not to cool the exhaust gas flowing into the H2O recovery unit 3.

[0106] (4) According to the first and second embodiments, in exhaust gas desorption mode, the exhaust gas that is not cooled by the cooling unit 2 passes through the H2O recovery unit 3 and is then discharged to the outside of the vehicle or construction machine from the third flow path. Therefore, the H2O desorbed from the H2O recovery unit 3 can be discharged effectively.

[0107] (5) According to the first and second embodiments, the CO2 recovery unit 4 is connected to the CO2 storage unit 5 via a seventh or fourth flow path, and a pump 6 is provided in these flow paths. In exhaust gas desorption mode, CO2 is desorbed from the CO2 recovery unit 4 by the pump 6, and the desorbed CO2 is stored in the CO2 storage unit 5. Therefore, CO2 can be suitably desorbed from the CO2 recovery unit.

[0108] (6) According to the third embodiment, in exhaust gas desorption mode, high-temperature exhaust gas that has not been cooled by the cooling unit 2 is introduced into the first or second CO2 recovery unit 4A, 4B, and H2O can be desorbed from the CO2 adsorbent. Therefore, H2O can be desorbed effectively.

[0109] (7) According to the third embodiment, the control unit 7 can switch whether the exhaust gas passes through the cooling unit 2 or flows into the second CO2 recovery unit by controlling the first valve V21 to switch the flow path of the exhaust gas. Therefore, it is possible to suitably switch whether or not to allow the exhaust gas before cooling to flow into the CO2 recovery unit.

[0110] (8) According to the third embodiment, in exhaust gas desorption mode, the exhaust gas flowing out from the first and second CO2 recovery units 4A and 4B is discharged to the outside of the vehicle or construction machine via the 10th flow path P30, as in the normal mode. Therefore, the H2O desorbed from the CO2 recovery unit can be discharged effectively.

[0111] (9) According to the third embodiment, the first and second CO2 recovery units 4A and 4B are connected to the CO2 storage unit 5 via the eighth A or eighth B flow path P28A and P28B, respectively. A second pump 6B is provided between the first and second CO2 recovery units 4A and 4B and the CO2 storage unit 5. During normal operation, the second pump 6B removes CO2 from the CO2 recovery units, which are in a desorption state, and the removed CO2 is stored in the CO2 storage unit 5. This allows for efficient removal of CO2 from the first and second CO2 recovery units 4A and 4B.

[0112] [5. Other Embodiments] (1) The CO2 recovery device 1 of the first and second embodiments comprises one H2O recovery unit 3 and one CO2 recovery unit 4, but the number of H2O recovery units 3 and CO2 recovery units 4 may be multiple (for example, two).

[0113] In normal mode, the control unit 7 may set one of the multiple H2O recovery units 3 to the adsorption state and switch the H2O recovery unit 3 to the adsorption state at the same switching timing as in the third embodiment. The control unit 7 may then introduce exhaust gas into the H2O recovery unit 3 that is in the adsorption state, thereby recovering H2O from the exhaust gas in the H2O recovery unit 3. In normal mode, the control unit 7 may also switch between the adsorption state and the desorption state of the CO2 recovery unit 4, as in the third embodiment, and perform CO2 recovery and desorption in parallel.

[0114] (2) In the CO2 recovery device 1 of the first and second embodiments, a flow path connecting the first valve and the CO2 recovery unit 4 may be provided. Then, when the exhaust gas desorption mode is activated, the control unit 7 may, as in the third embodiment, allow the exhaust gas that has not been cooled by the cooling unit 2 to flow into the CO2 recovery unit 4 and desorb H2O from the CO2 recovery unit 4.

[0115] (3) The CO2 recovery device 1 of the third embodiment comprises first and second H2O recovery units 3A, 3B and first and second CO2 recovery units 4A, 4B, but the number of H2O recovery units and the number of CO2 recovery units may be 1.

[0116] In normal mode, the control unit 7 may recover H2O and CO2 from the exhaust gas using the number of H2O recovery units and the CO2 recovery unit, similar to the third embodiment. On the other hand, in exhaust gas desorption mode, the control unit 7 may, in the same manner as in the third embodiment, introduce uncooled exhaust gas into the CO2 recovery unit and desorb H2O. Furthermore, the control unit 7 may, at a time different from the time when H2O is desorbed, desorb CO2 from the CO2 recovery unit using the second pump 6B, in the same manner as in the third embodiment.

[0117] (4) The CO2 recovery device 1 of the third embodiment comprises first and second H2O recovery units 3A, 3B and first and second CO2 recovery units 4A, 4B, but the number of H2O recovery units and the number of CO2 recovery units may be 3 or more.

[0118] Even in such a case, during normal mode, the control unit 7 may switch between the H2O recovery unit 3 that is in an adsorption state and the H2O recovery unit that is in a desorption state, at the same switching timing as in the third embodiment. Furthermore, the control unit 7 may perform H2O adsorption and desorption in parallel, as in the third embodiment.

[0119] Furthermore, in normal mode, the control unit 7 may switch between a CO2 recovery unit in an adsorption state and a CO2 recovery unit in a desorption state among the three or more CO2 recovery units at the same switching timing as in the third embodiment. The control unit 7 may also perform CO2 adsorption and desorption in parallel, as in the third embodiment.

[0120] (5) Multiple functions of one component in the above embodiment may be realized by multiple components, or one function of one component may be realized by multiple components. Also, multiple functions of multiple components may be realized by one component, or one function realized by multiple components may be realized by one component. Furthermore, some of the configurations of the above embodiment may be omitted. Furthermore, at least some of the configurations of the above embodiment may be added to or replaced with the configurations of other above embodiments.

[0121] [7. Correspondence between terms] In the first embodiment, the second flow path P02 corresponds to an example of a cooling flow path, the third flow path P03 corresponds to an example of a non-cooling flow path, the fourth and fifth flow paths P04 and P05 correspond to examples of connecting flow paths, the sixth flow path P06 corresponds to an example of a discharge flow path, and the seventh flow path P07 corresponds to an example of a storage flow path.

[0122] In the second embodiment, the first and second flow paths P11 and P12 correspond to examples of connecting flow paths, the first and third flow paths P11 and P13 correspond to examples of discharge flow paths, and the fourth flow path P14 corresponds to an example of a storage flow path.

[0123] In the third embodiment, the second flow path P22 corresponds to an example of a cooling flow path, the eighth to ninth flow paths P28A to P29 correspond to an example of a storage flow path, the seventh A, seventh B, tenth flow paths P27A, P27B, and P30 correspond to an example of an outlet flow path, and the eleventh flow path P31 corresponds to an example of an uncooled flow path.

[0124] [8. The technical concept disclosed herein] [Item 1] A CO2 recovery device configured to recover CO2 from exhaust gas from an internal combustion engine, An H2O recovery unit is configured to recover H2O from the exhaust gas by adsorbing H2O contained in the exhaust gas with an H2O adsorbent, A CO2 recovery unit is configured to recover CO2 from the exhaust gas by adsorbing the CO2 contained in the exhaust gas from which H2O has been recovered in the H2O recovery unit using a CO2 adsorbent, A cooling unit configured to cool the exhaust gas, A flow path for the exhaust gas to flow down, A switching unit that switches the path of the exhaust gas in the flow path, The system includes a control unit configured to control the aforementioned switching unit, and capable of switching between a normal mode and an exhaust gas desorption mode, The control unit, In the normal mode, the switching unit is controlled so that the exhaust gas cooled by the cooling unit flows into the H2O recovery unit via the flow path, and the exhaust gas from which H2O has been recovered in the H2O recovery unit flows into the CO2 recovery unit via the flow path. In the exhaust gas desorption mode, the switching unit is controlled so that the exhaust gas, which is not cooled by the cooling unit, flows through the flow path into the H2O recovery unit or the CO2 recovery unit. CO2 capture device.

[0125] [Item 2] The CO2 capture device described in item 1, When the exhaust gas desorption mode is active, the control unit controls the switching unit so that the exhaust gas, which is not cooled by the cooling unit, flows into the H2O recovery unit via the flow path. CO2 capture device.

[0126] [Item 3] CO2 capture device as described in item 2, The flow path has a cooling flow path and a non-cooling flow path that allow the exhaust gas to flow into the H2O recovery section. The switching unit is configured to switch the path of the exhaust gas flowing into the H2O recovery unit. The cooling unit is configured to cool the exhaust gas flowing down the cooling channel, The control unit, In the normal mode, the switching unit is controlled so that the exhaust gas flows into the H2O recovery unit via the cooling passage. In the exhaust gas desorption mode, the switching unit is controlled so that the exhaust gas flows into the H2O recovery unit via the non-cooled passage. CO2 capture device.

[0127] [Item 4] CO2 capture device as described in item 2, The aforementioned flow path has a cooling flow path that allows the exhaust gas to flow into the H2O recovery section. The cooling unit is configured to blow air toward the cooling channel, The control unit, In the normal mode described above, the cooling unit blows air toward the cooling channel. When the exhaust gas desorption mode is active, the airflow to the cooling unit is stopped. CO2 capture device.

[0128] [Item 5] A CO2 recovery device described in any one of items 2 to 4, The aforementioned flow path is A discharge channel for discharging the exhaust gas that has flowed out from the H2O recovery unit, The system further includes a connecting channel that connects the H2O recovery unit and the CO2 recovery unit, The switching unit is configured to switch the path of the exhaust gas that has flowed out from the H2O recovery unit. The control unit, In the normal mode, the switching unit is controlled so that the exhaust gas flowing out from the H2O recovery unit flows into the CO2 recovery unit via the connecting passage. In the exhaust gas desorption mode, the switching unit is controlled so that the exhaust gas flowing out from the H2O recovery unit is discharged through the discharge channel. CO2 capture device.

[0129] [Item 6] The CO2 capture device described in item 1, When the exhaust gas desorption mode is active, the control unit controls the switching unit so that the exhaust gas, which is not cooled by the cooling unit, flows into the CO2 recovery unit via the flow path. CO2 capture device.

[0130] [Item 7] CO2 capture device as described in item 6, The aforementioned flow path is The H2O recovery section includes a cooling channel for introducing the exhaust gas, The CO2 recovery section has an uncooled flow path for introducing the exhaust gas, The switching unit is configured to switch the path of the exhaust gas so that it is directed towards either the cooling passage or the non-cooling passage. The cooling unit is configured to cool the exhaust gas flowing down the cooling channel, The control unit, In the normal mode, the switching unit is controlled so that the exhaust gas flows into the cooling passage. In the exhaust gas desorption mode, the switching unit is controlled to allow the exhaust gas to flow into the non-cooled passage. CO2 capture device.

[0131] [Item 8] CO2 recovery device as described in item 6 or item 7, The aforementioned flow path further includes an outlet flow path for discharging the exhaust gas that has flowed out from the CO2 recovery unit. The control unit controls the switching unit so that the exhaust gas flowing out of the CO2 recovery unit is discharged through the outlet passage when the system is in the normal mode or the exhaust gas desorption mode. CO2 capture device.

[0132] [Item 9] A CO2 recovery device described in any one of items 1 to 8, A CO2 storage unit configured to store CO2, A pump, and further equipped, The aforementioned flow path further includes a storage flow path connecting the CO2 recovery section and the CO2 storage section. The pump is provided in the storage channel, The control unit is configured to operate the pump to desorb CO2 from the CO2 adsorbent in the CO2 recovery unit via the storage channel, and to allow the desorbed CO2 to flow into the CO2 storage unit. CO2 capture device. [Explanation of Symbols]

[0133] 1...CO2 recovery unit, 2...Cooling unit, 20...Cooling channel, 21...Fan, 3...H2O recovery unit, 3A,3B...1st and 2nd H2O recovery units, 4...CO2 recovery unit, 4A,4B...1st and 2nd CO2 recovery units, 5...CO2 storage unit, 6...Pump, 6A,6B...1st and 2nd pumps, 7...Control unit, P01~P07...1st to 7th channels, V01~V05...1st to 5th valves, P11~P14...1st to 4th channels, V11~V13...1st to 3rd valves, P21~P31...1st to 11th channels, V21~V27...1st to 7th valves.

Claims

1. A CO2 recovery device configured to recover CO2 from exhaust gas from an internal combustion engine, An H2O recovery unit is configured to recover H2O from the exhaust gas by adsorbing H2O contained in the exhaust gas with an H2O adsorbent, A CO2 recovery unit is configured to recover CO2 from the exhaust gas by adsorbing the CO2 contained in the exhaust gas from which H2O has been recovered in the H2O recovery unit using a CO2 adsorbent, A cooling unit configured to cool the exhaust gas, A flow path for the exhaust gas to flow down, A switching unit that switches the path of the exhaust gas in the flow path, The system includes a control unit configured to control the aforementioned switching unit, and capable of switching between a normal mode and an exhaust gas desorption mode, The control unit, In the normal mode, the switching unit is controlled so that the exhaust gas cooled by the cooling unit flows into the H2O recovery unit via the flow path, and the exhaust gas from which H2O has been recovered in the H2O recovery unit flows into the CO2 recovery unit via the flow path. In the exhaust gas desorption mode, the switching unit is controlled so that the exhaust gas, which is not cooled by the cooling unit, flows through the flow path into the H2O recovery unit or the CO2 recovery unit. CO2 recovery device.

2. A CO2 recovery device according to claim 1, When the exhaust gas desorption mode is active, the control unit controls the switching unit so that the exhaust gas, which is not cooled by the cooling unit, flows into the H2O recovery unit via the flow path. CO2 recovery device.

3. A CO2 recovery device according to claim 2, The flow path has a cooling flow path and a non-cooling flow path that allow the exhaust gas to flow into the H2O recovery section. The switching unit is configured to switch the path of the exhaust gas flowing into the H2O recovery unit. The cooling unit is configured to cool the exhaust gas flowing down the cooling channel, The control unit, In the normal mode, the switching unit is controlled so that the exhaust gas flows into the H2O recovery unit via the cooling passage. In the exhaust gas desorption mode, the switching unit is controlled so that the exhaust gas flows into the H2O recovery unit via the non-cooled passage. CO2 recovery device.

4. A CO2 recovery device according to claim 2, The aforementioned flow path has a cooling flow path that allows the exhaust gas to flow into the H2O recovery section. The cooling unit is configured to blow air toward the cooling channel, The control unit, In the normal mode described above, the cooling unit blows air toward the cooling channel. When the exhaust gas desorption mode is active, the airflow to the cooling unit is stopped. CO2 recovery device.

5. A CO2 recovery device according to any one of claims 2 to 4, The aforementioned flow path is A discharge channel for discharging the exhaust gas that has flowed out from the H2O recovery unit, The system further includes a connecting channel that connects the H2O recovery unit and the CO2 recovery unit, The switching unit is configured to switch the path of the exhaust gas that has flowed out from the H2O recovery unit. The control unit, In the normal mode, the switching unit is controlled so that the exhaust gas flowing out from the H2O recovery unit flows into the CO2 recovery unit via the connecting passage. In the exhaust gas desorption mode, the switching unit is controlled so that the exhaust gas flowing out from the H2O recovery unit is discharged through the discharge channel. CO2 recovery device.

6. A CO2 recovery device according to claim 1, When the exhaust gas desorption mode is active, the control unit controls the switching unit so that the exhaust gas, which is not cooled by the cooling unit, flows into the CO2 recovery unit via the flow path. CO2 recovery device.

7. A CO2 recovery device according to claim 6, The aforementioned flow path is The H2O recovery section includes a cooling channel for introducing the exhaust gas, The CO2 recovery section has an uncooled flow path for introducing the exhaust gas, The switching unit is configured to switch the path of the exhaust gas so that it is directed towards either the cooling passage or the non-cooling passage. The cooling unit is configured to cool the exhaust gas flowing down the cooling channel, The control unit, In the normal mode, the switching unit is controlled so that the exhaust gas flows into the cooling passage. In the exhaust gas desorption mode, the switching unit is controlled to allow the exhaust gas to flow into the non-cooled passage. CO2 recovery device.

8. A CO2 recovery device according to claim 6 or claim 7, The aforementioned flow path further includes an outlet flow path for discharging the exhaust gas that has flowed out from the CO2 recovery unit. The control unit controls the switching unit so that the exhaust gas flowing out from the CO2 recovery unit is discharged through the outlet passage when the system is in the normal mode or the exhaust gas desorption mode. CO2 recovery device.

9. A CO2 recovery device according to any one of claims 1 to 4, and claims 6 and 7, A CO2 storage unit configured to store CO2, A pump, and further equipped, The aforementioned flow path further includes a storage flow path connecting the CO2 recovery section and the CO2 storage section. The pump is provided in the storage channel, The control unit is configured to operate the pump to detach CO2 from the CO2 adsorbent in the CO2 recovery unit via the storage channel, and to allow the detached CO2 to flow into the CO2 storage unit. CO2 recovery device.

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