CO2 recovery device

Abstract

Condensed water enters the area where the H2O adsorbent is placed. [Solution] The CO2 recovery device is configured to recover CO2 from exhaust gas from an internal combustion engine. It comprises a cooling section, an H2O recovery section, an inlet passage, a CO2 recovery section, and a drain hole. The H2O recovery section has an H2O adsorbent that adsorbs H2O contained in the exhaust gas cooled by the cooling section. The inlet passage connects the cooling section to the area where the H2O adsorbent in the H2O recovery section is located. The drain hole is a hole that connects the inlet passage to the outside. The exhaust gas inlet from the inlet passage in the area where the H2O adsorbent is located is situated above the outlet of the inlet passage.

Description

Technical Field

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

Background Art

[0002] As described in Patent Document 1, a CO2 separation device that removes CO2 from exhaust gas emitted from an internal combustion engine of a vehicle is known. The CO2 separation device includes a heat exchanger, a water adsorber, and a CO2 adsorber. The exhaust gas emitted from the internal combustion engine is cooled by the heat exchanger and then flows into the water adsorber, where H2O contained in the exhaust gas is removed by an adsorbent. 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 the adsorbent.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the CO2 separation device of Patent Document 1, condensed water is generated when the exhaust gas is cooled by the heat exchanger, and there is a possibility that the condensed water enters the water adsorber. In such a case, the adsorbent in the water adsorber absorbs the condensed water, and the water adsorption capacity of the adsorbent decreases. Therefore, the amount of H2O to be disposed in the water adsorber increases, which may lead to an increase in the size of the water adsorber.

[0005] In one aspect of the present disclosure, it is desirable to suppress the entry of condensed water into the region where the H2O adsorbent is disposed.

Means for Solving the Problems

[0006] One aspect of the present disclosure is a CO2 recovery device configured to recover CO2 from exhaust gas from an internal combustion engine, comprising a cooling unit, an H2O recovery unit, an introduction channel, a CO2 recovery unit, and a drain hole. The cooling unit is configured to cool the exhaust gas. The H2O recovery unit has an H2O adsorbent that adsorbs H2O contained in the exhaust gas cooled by the cooling unit. The introduction channel is an exhaust gas flow path connecting the cooling unit and the area where the H2O adsorbent is located in the H2O recovery unit. The CO2 recovery unit has a CO2 adsorbent that adsorbs CO2 contained in the exhaust gas from which H2O has been recovered in the H2O recovery unit. The drain hole is a hole connecting the introduction channel to the outside, configured to discharge condensed water generated from the exhaust gas to the outside. In the area where the H2O adsorbent is located, the inlet into which the exhaust gas flowing out from the introduction channel flows in is located above the outlet, which is the part of the introduction channel that connects to the area where the H2O adsorbent is located.

[0007] According to the above configuration, the introduction channel is provided with an outlet hole for discharging condensed water to the outside, and the inlet to the area where the H2O adsorbent is placed is located above the outlet of the introduction channel. Therefore, it is possible to suppress the entry of condensed water into the area where the H2O adsorbent is placed.

[0008] One aspect of the present disclosure may further include a reservoir for storing condensate. A drain hole may be located below the reservoir. The reservoir may be located below the area where the H2O adsorbent is placed.

[0009] With the above configuration, condensed water can be effectively discharged to the outside. In one aspect of this disclosure, the H2O recovery unit may have a case portion having an internal area for the placement of an H2O adsorbent. The introduction channel may be connected to the H2O adsorbent area inside the case portion. The drain hole may be located below the entrance to the H2O adsorbent area in the case portion.

[0010] According to the above configuration, it is possible to suppress the entry of condensed water generated in the case of the H2O recovery unit into the area where the H2O adsorbent is placed. In one aspect of this disclosure, the H2O recovery unit may have a case portion having an internal area for the placement of an H2O adsorbent. The introduction channel may be connected to the H2O adsorbent area inside the case portion. The drain hole and water storage portion may be located below the entrance to the H2O adsorbent area in the case portion.

[0011] According to the above configuration, it is possible to suppress the entry of condensed water generated in the case of the H2O recovery unit into the area where the H2O adsorbent is placed. [Brief explanation of the drawing]

[0012] [Figure 1] This is an explanatory diagram of the CO2 recovery device according to the first embodiment. [Figure 2] Figure 2A is an explanatory diagram of the CO2 recovery device according to the second embodiment. Figure 2B is an explanatory diagram of the CO2 recovery device in a modified example of the second embodiment. [Modes for carrying out the invention]

[0013] 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 Figure 1). 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.

[0014] 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 (not shown). As will be described in detail later, in the CO2 recovery device 1, the introduction channel that guides the exhaust gas cooled by the cooling unit 2 to the area where the H2O adsorbent is placed inside the H2O recovery unit 3 is provided with a discharge hole for discharging condensed water to the outside of the introduction channel.

[0015] [(2) Configuration of the flow path] The CO2 recovery device 1 comprises first to fifth flow paths P1 to P5, which are gas flow paths formed by pipes and other components, first to fourth valves V1 to V4, and a check valve V5 (see Figure 1). The first valve V1 is configured, for example, as a three-way valve that switches the flow path through which gas flows. The second to fourth valves V2 to V4 are configured, for example, as two-way valves that adjust the opening degree of the gas flow paths.

[0016] The first flow path P1 receives exhaust gas from the internal combustion engine from its starting point, and its end is connected to the H2O recovery unit 3. A cooling unit 2 is also provided in the first flow path P1. The second channel P2 has its starting end connected to the H2O recovery unit 3 and its ending end connected to the CO2 recovery unit 4. The second channel P2 is also provided with first and second valves V1 and V2. The first valve V1 is located closer to the starting end than the second valve V2.

[0017] The third channel P3 is a channel that separates from the second channel P2, with its starting end connected to the first valve V1 and its end open to the outside of the vehicle or construction machine. The fourth channel P4 has its starting end connected to the CO2 recovery unit 4 and its ending end connected to the third channel P3. The fourth channel P4 is also provided with a third valve V3.

[0018] The fifth flow path P5 has its starting end connected to the CO2 recovery unit 4 and its end open to the outside of the vehicle or construction machine. The fifth flow path P5 is also equipped with a fourth valve V4, a pump 6, a CO2 storage unit 5, and a check valve V5, arranged in that order from the starting end to the ending end. The check valve V5 is configured to prevent fluid from moving from the ending end to the starting end of the fifth flow path P5, while allowing fluid to move from the starting end to the ending end.

[0019] [(3) Cooling section] The cooling unit 2 is configured to cool the exhaust gas flowing down the first flow path P1 by, for example, performing heat exchange between the refrigerant and the exhaust gas (see FIG. 1). In the cooling unit 2, a dedicated refrigerant may be used, or a refrigerant used in another device mounted on the vehicle or construction machine may be used. Further, the cooling unit 2 may cool the exhaust gas by heat exchange with the atmosphere.

[0020] [(4) H2O recovery unit] The H2O recovery unit 3 includes, for example, an H2O adsorbent such as silica gel, zeolite, activated alumina, etc., and adsorbs the H2O contained in the exhaust gas flowing in from the first flow path P1 by the H2O adsorbent, thereby recovering H2O from the exhaust gas (see FIG. 1). Then, the H2O recovery unit 3 discharges the exhaust gas from which H2O has been recovered to the second flow path P2.

[0021] That is, the H2O recovery unit 3 removes H2O from the exhaust gas from which CO2 is recovered by the CO2 recovery unit 4. Thereby, it is possible to suppress the adsorption of H2O in the exhaust gas to the CO2 adsorbent in the CO2 recovery unit 4 and the reduction of the CO2 adsorption effect of the CO2 adsorbent.

[0022] The H2O recovery unit 3 includes a case part 30, an inlet part 31 (in other words, a water storage part), a drain hole 32, an arrangement region 33 for the H2O adsorbent, and an outlet part 34. <Case part> The case part 30 is a member for housing the H2O adsorbent, and is, for example, an elongated cylindrical member with both ends closed (see FIG. 1). Further, the case part 30 is arranged to extend in a direction substantially coinciding with the vertical direction from the first end located on the lower side to the second end located on the upper side.

[0023] <Inlet part> The inlet part 31 is a part near the first end in the case part 30, and has a bottom part 31A and a side part 31B (see FIG. 1). The inlet part 31 is located below the arrangement region 33 for the H2O adsorbent.

[0024] The bottom part 31A is a plate-like part forming the bottom surface of the first end in the case part 30. The side portion 31B is a portion located near the first end on the side wall of the case portion 30, protruding from the edge of the bottom portion 31A, and is a plate-like portion surrounding the bottom portion 31A.

[0025] Also, the end of the first flow path P1 is connected to the inlet portion 31, and the exhaust gas from the first flow path P1 first flows into the inlet portion 31 and then into the H2O adsorbent arrangement region 33. Specifically, the end of the first flow path P1 is connected to the side portion 31B. However, it is not limited to this, and the end of the first flow path P can also be connected to the bottom portion 31A.

[0026] <Outlet portion> The outlet portion 34 is a portion near the second end in the case portion 30 and has a bottom portion and a side portion similar to those of the inlet portion 31 (see FIG. 1). Also, the start end of the second flow path P2 is connected to the outlet portion 34, and the exhaust gas flowing out from the H2O adsorbent arrangement region 33 passes through the outlet portion 34 and flows into the start end of the second flow path P2.

[0027] <Arrangement region of H2O adsorbent> The H2O adsorbent arrangement region 33 is formed between the inlet portion 31 and the outlet portion 34 inside the case portion 30 (see FIG. 1). That is, the H2O adsorbent arrangement region 33 is formed at a position away from both ends of the case portion 30.

[0028] Specifically, a permeable member is provided adjacent to each of the inlet portion 31 and the outlet portion 34, and the H2O adsorbent is arranged between these members. That is, both ends in the extending direction of the case portion 30 in the H2O adsorbent arrangement region 33 are partitioned by the plate-like member. Also, the end face on the first end side of the H2O adsorbent arrangement region 33 forms an inlet 33A for the exhaust gas to the H2O adsorbent arrangement region 33, and the end face on the second end side forms an outlet for the exhaust gas. Note that the inlet 33A spreads in a substantially planar shape as an example, but the shape of the inlet 33A can be determined as appropriate.

[0029] <Water storage portion and discharge hole> As described above, the exhaust gas that has passed through the cooling section 2 flows into the inlet section 31 after passing through the first flow path P1, and then into the H2O adsorbent placement area 33 (see Figure 1). In other words, the downstream section of the cooling section 2 in the first flow path P1 and the inlet section 31 form the introduction flow path described above, connecting the cooling section 2 and the H2O adsorbent placement area 33. Furthermore, the introduction flow path connects to the H2O adsorbent placement area 33 inside the case section 30 of the H2O recovery section 3.

[0030] Furthermore, the bottom 31A and side 31B of the inlet section 31 form a reservoir that collects condensed water generated from the exhaust gas flowing down the introduction channel in the space between it and the inlet 33A of the H2O adsorbent placement area 33. Of course, the reservoir forms part of the introduction channel. Also, the reservoir is located below the inlet 33A.

[0031] Furthermore, the bottom portion 31A is provided with a drain hole 32 that penetrates the bottom portion 31A. The drain hole 32 is located at the bottom of the water storage section. The drain hole 32 connects the inside and outside of the inlet portion 31, in other words, the inside and outside of the intake channel, and the condensed water accumulated in the water storage section is discharged to the outside of the intake channel through the drain hole 32. The number of drain holes 32 may be one or multiple.

[0032] As described above, the side portion 31B of the inlet portion 31 is provided so as to surround the bottom portion 31A, and an opening is formed on the side portion 31B opposite to the bottom portion 31A. This opening forms the outlet 31C of the introduction channel and connects to the inlet 33A of the H2O adsorbent placement area 33. The outlet 31C is, for example, spread out in a substantially planar shape, but the shape of the outlet 31C can be determined as appropriate. The inlet 33A of the H2O adsorbent placement area 33 is adjacent to the inlet 33A above the outlet 31C of the introduction channel.

[0033] For example, the length of the case portion 30 in the extension direction at the side portion 31B may be shortened, and the end of the first flow path P1 may be connected to the bottom portion 31A, thereby effectively preventing the inlet portion 31 from functioning as a water storage portion.

[0034] [(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 Figure 1). The CO2 recovery unit 4 recovers CO2 from the exhaust gas by adsorbing the CO2 contained in the exhaust gas flowing in from the second flow path P2 using the CO2 adsorbent. The CO2 recovery unit 4 then discharges the exhaust gas from which CO2 has been recovered into the fourth flow path P4.

[0035] [(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 Figure 1). The CO2 storage unit 5 is equipped with, for example, the same CO2 adsorbent as the CO2 recovery unit 4.

[0036] [(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 Figure 1). Pump 6 depressurizes the inside of the CO2 recovery unit 4 via the fifth flow path P5, creating a vacuum and desorbing CO2 from the CO2 adsorbent. Then, pump 6 causes the desorbed CO2 to flow into the CO2 storage unit 5 via the fifth flow path P5, and stores the CO2 in the CO2 storage unit 5.

[0037] [(8) Control Unit] The control unit is configured to control various parts of the CO2 recovery device 1, such as the first to fourth valves V1 to V4, the check valve V5, and the pump 6, by transmitting signals to these parts, and includes a CPU and memory (see Figure 1). 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 are not limited to being realized by program execution; some or all of them may be realized using one or more hardware components.

[0038] [(9) Processing of CO2 recovery equipment] The control unit of the CO2 recovery device 1 is capable of switching between adsorption mode and desorption mode. Furthermore, while the vehicle or construction machinery is in operation, the control unit may alternate between adsorption mode and desorption mode.

[0039] <Adsorption Mode> In adsorption 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 1). The exhaust gas from which CO2 has been recovered is then discharged to the outside of the vehicle or construction machine.

[0040] When the control unit switches to adsorption mode, it controls the first valve V1 to close the starting end of the third flow path P3 and open the starting end of the section of the second flow path P2 downstream of the first valve V1. The control unit also opens the second and third valves V2 and V3 and closes the fourth valve V4.

[0041] As a result, the exhaust gas that flows into the starting point of the first flow path P1 flows down along the flow path 1A. That is, the exhaust gas flows down along the first flow path P1, passing sequentially through the cooling section 2 and the H2O recovery section 3, and flows into the second flow path P02. The exhaust gas that flows into the second flow path P02 does not flow into the third flow path P3, but flows into the CO2 recovery section 4. The exhaust gas that flows out from the CO2 recovery section 4 then flows down the fourth flow path P4 and flows into the third flow path P3, and is discharged to the outside of the vehicle or construction machine from the end of the third flow path P3.

[0042] <Detachment Mode> In desorption mode, CO2 is desorbed from the CO2 adsorbent in the CO2 recovery unit 4, and the desorbed CO2 is stored in the CO2 storage unit 5 (see Figure 1). At this time, the exhaust gas that flows into the starting end of the first flow path P1 passes through the H2O recovery unit 3 and is then discharged to the outside of the vehicle or construction machine.

[0043] When the control unit enters deactivation mode, it controls the first valve V1 to open the starting end of the third flow path P3 and close the starting end of the section of the second flow path P2 downstream of the first valve V1. The control unit also closes the second and third valves V2 and V3 and opens the fourth valve V4. The control unit also operates the pump 6 to reduce the pressure inside the CO2 recovery unit 4.

[0044] As a result, the exhaust gas that flows into the starting end of the first flow path P1 flows down along the flow path 1B. That is, as the exhaust gas flows down along the first flow path P1, it sequentially passes through the cooling unit 2 and the H2O recovery unit 3 and flows into the second flow path P2. The exhaust gas that flows into the second flow path P2 then passes through the third flow path P3 and is discharged to the outside of the vehicle or construction machine. At this time, the cooling unit 2 may be stopped, which causes the high-temperature exhaust gas to flow down through the H2O recovery unit 3, releasing the H2O that had been adsorbed on the H2O adsorbent in the H2O recovery unit 3, and discharging it to the outside of the vehicle or construction machine along with the exhaust gas.

[0045] Furthermore, the operation of pump 6 reduces the pressure in the CO2 recovery unit 4 via the fifth flow path P5, causing CO2 to detach from the CO2 adsorbent. The detached CO2 flows into the CO2 storage unit 5 as shown in flow path 1C and is stored in the CO2 storage unit 5. At this time, along with the detached CO2, other gases present in the CO2 recovery unit 4 also flow into the CO2 storage unit 5. After passing through the CO2 storage unit 5, these gases pass through the check valve V5 and are discharged to the outside of the vehicle or construction machine.

[0046] [2. Second Embodiment] [(1) Overview] The CO2 recovery device 1 of the second embodiment differs from the first embodiment in that the water storage section 7 and the discharge hole 73 are located in the section between the cooling section 2 and the H2O recovery section 3 in the first flow path P1, rather than at the inlet 31 of the H2O recovery section 3 (see Figure 2A). The differences between the CO2 recovery device 1 of the second embodiment and the first embodiment will be described below.

[0047] [(2) Inlet of the H2O recovery section] In the second embodiment, the inlet 31 of the H2O recovery section 3 differs from the first embodiment in that a drain hole 32 is not provided at the bottom 31A (see Figure 2A). In other words, the inlet 31 does not function as a water storage section. It should be noted that, as in the first embodiment, the inlet 33A of the H2O adsorbent placement area 33 is adjacent to the inlet 33A above the outlet 31C of the introduction channel.

[0048] [(3) Water storage section and drainage holes] The water storage section 7 of the second embodiment constitutes a part of the first flow path P1 (in other words, the introduction flow path) (see Figure 2A). Hereafter, the upstream section of the water storage section 7 in the first flow path P1 will be referred to as the upstream section P1A, and the downstream section will be referred to as the downstream section P1B. The water storage section 7 is located below the H2O adsorbent placement area 33 and comprises a bottom section 70, side sections 71, and a top section 72. These sections separate the inside from the outside of the water storage section 7.

[0049] The bottom portion 70 is a plate-shaped part having a predetermined shape. The bottom portion 70 is provided with drainage holes 73 that penetrate the bottom portion 70 and connect the inside and outside of the water storage portion 7. The number of drainage holes 73 may be one or multiple.

[0050] The side portion 71 is a plate-like portion that protrudes upward from the edge of the bottom portion 70 and is provided to surround the bottom portion 70. The side portion 71 also has first and second portions 71A and 71B that are provided facing each other.

[0051] The ceiling portion 72 is a plate-like portion provided at the upper end of the side portion 71 and faces the bottom portion 70. Furthermore, the first portion 71A of the side portion 71 is provided with an upstream connection portion that connects to the end of the upstream section P1A of the first flow path P1, and the second portion 71B is provided with a downstream connection portion that connects to the beginning of the downstream section P1B.

[0052] The upstream connection is located at a predetermined distance above the bottom 70. The condensed water accumulated in this area is discharged to the outside through the discharge hole 73 in the bottom 70. Furthermore, the downstream connection is located above the upstream connection. This allows the condensed water generated from the exhaust gas flowing in from the upstream connection to flow towards the downstream connection to be properly stored inside the water storage section 7.

[0053] [(4) Modified Version] A modified CO2 recovery device 1 of the second embodiment does not have a water storage section 7, and a drain hole 73 is provided in the section between the cooling section 2 and the H2O recovery section 3 in the first flow path P1 (see Figure 2B). Specifically, at least one drain hole 73 is provided at the lower part of the side wall of the pipe forming the section of the first flow path P1, connecting the inside and outside of the first flow path P1.

[0054] [3. Effects] (1) According to the above embodiment, the introduction channel is provided with discharge holes 32 and 73 for discharging condensed water to the outside, and the inlet 33A of the H2O adsorbent placement area 33 is located above the outlet 31C of the introduction channel. Therefore, it is possible to suppress condensed water generated from exhaust gas from entering the H2O adsorbent placement area 33. As a result, a decrease in the adsorption capacity of the H2O adsorbent can be suppressed, and the amount of H2O adsorbent that needs to be placed in the case part 30 of the H2O recovery unit 3 can be reduced, and as a result, the size of the CO2 recovery device 1 can be suppressed. In addition, the frequency of desorption of H2O from the H2O adsorbent in the H2O recovery unit 3 can be reduced.

[0055] (2) In addition, the intake channel is equipped with a water storage section along with a drain hole. This allows for efficient discharge of condensed water to the outside. (3) In the first embodiment, a water storage section and a discharge hole 32 are provided in the case section 30 of the CO2 recovery section 3. This prevents condensed water generated in the case section 30 from entering the area 33 where the H2O adsorbent is placed. In addition, compared to the case in which a water storage section 7 is provided in the first flow path P1, it is possible to miniaturize the CO2 recovery device 1 and improve the mountability of the CO2 recovery device 1 on a vehicle or construction machine.

[0056] [4. Other Embodiments] (1) In the first and second embodiments, the case portion 30 of the H2O recovery unit 3 is cylindrical. However, the shape of the case portion 30 can be appropriately determined within a range that allows the inlet A of the H2O adsorbent placement area 33 to be positioned above the outlet 31C of the introduction channel.

[0057] Furthermore, the case portion 30 of the H2O recovery unit 3 extends in a direction substantially coincided with the vertical direction. However, it is not limited to this, and the case portion 30 may be positioned so as to be inclined with respect to the vertical direction, while the inlet A of the H2O adsorbent placement area 33 is positioned above the outlet 31C of the introduction channel.

[0058] (2) In the first embodiment, a water storage section 7 may be provided in the first flow path P1, or a drain hole 73 may be provided in the first flow path P1, similar to the second embodiment. (3) In the above embodiment, the H2O recovery unit 3 does not need to have an outlet unit 34. That is, the H2O adsorbent placement area 33 may reach the end of the case unit 30 opposite to the inlet unit 31, in other words, the connection point with the starting end of the second flow path P2 in the case unit 30.

[0059] (4) The configuration of the gas flow path, and the position, number, and type of valves in the CO2 recovery device 1 of the above embodiment can be determined as appropriate. Specifically, for example, the CO2 recovery device 1 does not have to have a second valve V2. Alternatively, for example, the first valve V1 may be configured as a two-way valve, and the first valve V1 may be placed upstream of the connection point between the end of the fourth flow path P4 and the third flow path P3. Alternatively, for example, a valve configured as a two-way valve may be placed in place of the check valve V5. Alternatively, for example, the end of the fourth flow path P4 may not be connected to the third flow path P3, but opened to the outside of the vehicle or construction machine. The exhaust gas flowing out from the CO2 recovery unit 4 may be discharged to the outside via the fourth flow path P4. Even with such a configuration, it is possible to transition between the adsorption mode and the desorption mode in the same manner as in the above embodiment.

[0060] (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. [Explanation of Symbols]

[0061] 1...CO2 recovery device, 2...Cooling section, 3...H2O recovery section, 30...Case section, 31...Inlet section, 31A...Bottom section, 31B...Side section, 31C...Outlet, 32...Drain hole, 33...H2O adsorbent placement area, 33A...Inlet, 34...Outlet section, 4...CO2 recovery section, 5...CO2 storage section, 6...Pump, P1~P5...1st~5th flow path, V1~V4...1st~4th valve, V5...Check valve, 7...Water storage section, 70...Bottom section, 71...Side section, 71A,71B...1st and 2nd sections, 72...Ceiling section, 73...Drain hole.

Claims

1. A CO2 recovery device configured to recover CO2 from exhaust gas from an internal combustion engine, A cooling unit configured to cool the exhaust gas, An H2O recovery unit having an H2O adsorbent that adsorbs H2O contained in the exhaust gas cooled by the cooling unit, The introduction channel, which is the exhaust gas flow path, connects the cooling section and the area where the H2O adsorbent is placed in the H2O recovery section. A CO2 recovery unit having a CO2 adsorbent that adsorbs CO2 contained in the exhaust gas from which H2O has been recovered in the H2O recovery unit, It comprises a drain hole, which is a hole connecting the introduction channel to the outside, configured to discharge condensed water generated from the exhaust gas to the outside, In the region where the H2O adsorbent is placed, the inlet into which the exhaust gas flowing out from the introduction channel flows in is located above the outlet, which is the part of the introduction channel that connects to the region where the H2O adsorbent is placed. CO2 recovery device.

2. A CO2 recovery device according to claim 1, The system further includes a water storage section for storing the aforementioned condensed water, The drain hole is located at the bottom of the water storage section. The water storage section is located below the area where the H2O adsorbent is placed. CO2 recovery device.

3. A CO2 recovery device according to claim 1, The H2O recovery unit has a case portion in which a region for arranging the H2O adsorbent is provided. The introduction channel is connected to the area where the H2O adsorbent is placed inside the case. The drain hole is located below the entrance in the area where the H2O adsorbent is placed in the case. CO2 recovery device.

4. A CO2 recovery device according to claim 2, The CO2 recovery unit has a case portion in which the H2O adsorbent is placed. The introduction channel is connected to the area where the H2O adsorbent is placed inside the case. The drain hole and the water storage section are located below the inlet in the area where the H2O adsorbent is placed in the case section. CO2 recovery device.

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