Carbon Dioxide Capture Equipment

Abstract

To suppress deviation of a gaseous flow that has flowed out to an adsorption layer of carbon dioxide.SOLUTION: A carbon dioxide recovery apparatus comprises an inner tube, an outer tube, an adsorption layer, and a rotary part. The rotary part makes the outer tube rotate relative to the inner tube. The inner tube includes an inner tube communication part. The inner tube communication part has a plurality of inner tube holes arrayed at an interval in the circumferential direction. The outer tube includes an outer tube communication part. The outer tube communication part has a plurality of outer tube holes arrayed at an interval in the circumferential direction. In the inner tube communication part and the outer tube communication part, at least two out of the plurality of inner tube holes overlap any of the outer tube holes at least once in a rotational period.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present disclosure relates to carbon dioxide capture devices. [Background technology]

[0002] The CO2 absorption device described in Patent Document 1 includes a cylindrical device body on which a rotating shaft with a screw blade is disposed, and lithium silicate, which is a CO2 adsorbent, is accommodated in the device body. Then, exhaust gas is injected from multiple injection ports provided on the rotating shaft, causing the CO2 contained in the exhaust gas to be adsorbed by the adsorbent. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2011-161332 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, simply injecting exhaust gas from multiple nozzles on the rotating shaft can cause the exhaust gas flow to become biased, which can prevent the exhaust gas from reaching the entire area of ​​the adsorbent placed in the main body of the device, making it difficult to effectively adsorb CO2 into the adsorbent.

[0005] One aspect of the present disclosure aims to suppress bias in the flow of gas that has flowed into a carbon dioxide adsorption layer. [Means for solving the problem]

[0006] One aspect of the present disclosure is a carbon dioxide capture device, comprising an inner pipe, an outer pipe, an adsorption layer, and a rotating unit. The inner pipe is configured to receive a gas containing carbon dioxide. The outer pipe is arranged to cover an outer circumferential surface of the inner pipe. The adsorption layer is arranged to surround an outer circumferential surface of the outer pipe and is configured to adsorb carbon dioxide contained in the gas. The rotating unit is configured to rotate the outer pipe relative to the inner pipe about a central axis. The inner pipe comprises an inner pipe communication portion, which communicates between the inside and outside of the inner pipe and has a plurality of inner pipe holes spaced apart from each other in the circumferential direction about the central axis. The outer pipe comprises an outer pipe communication portion, which communicates between the inside and outside of the outer pipe and has a plurality of outer pipe holes spaced apart from each other in the circumferential direction. The inner pipe communicating portion and the outer pipe communicating portion are configured so that at least two of the multiple inner pipe hole portions overlap with any of the outer pipe hole portions at least once during a rotation cycle in which the rotating portion rotates the outer pipe once relative to the inner pipe.

[0007] According to the above configuration, the total area of ​​the overlapping parts of the multiple inner pipe holes and multiple outer pipe holes (hereinafter also referred to as the total communication area) changes due to the relative rotation of the outer pipe and the inner pipe. Therefore, the speed of the gas passing through the overlapping inner pipe holes and outer pipe holes (hereinafter also referred to as the communication holes) changes. Therefore, it is possible to suppress bias in the flow of the gas containing carbon dioxide that flows into the carbon dioxide adsorption layer.

[0008] In one aspect of the present disclosure, the inner pipe communicating portion may be provided with A (A is an integer of 3 or more) inner pipe positions arranged around the central axis at equal intervals, and at least two of the A inner pipe positions may be provided with inner pipe holes. The outer pipe communicating portion may be provided with A outer pipe positions arranged around the central axis at equal intervals, and at least two of the A outer pipe positions may be provided with outer pipe holes. The timing at which each inner pipe position and each outer pipe position are aligned in the radial direction from the central axis may be the overlap timing. The inner pipe communicating portion and the outer pipe communicating portion may be configured such that at least one inner pipe hole portion overlaps with any of the outer pipe holes at first and second overlap timings among A overlap timings that arrive in the rotation period. A first communication number, which is the number of inner pipe holes and outer pipe holes that overlap at the first overlap timing, may be different from a second communication number, which is the number of inner pipe holes and outer pipe holes that overlap at the second overlap timing.

[0009] According to the above configuration, the total communication area is different at each of the first and second overlapping times, and the speed of the gas passing through the communication holes is different, so that it is possible to suppress bias in the flow of the gas containing carbon dioxide that has flowed into the carbon dioxide adsorption layer.

[0010] In one aspect of the present disclosure, the first and second communication numbers may be plural. The inner pipe communication portion and the outer pipe communication portion may be configured such that, at the first and second overlapping timings, the inner pipe positions and the outer pipe positions in the overlapping inner pipe hole portion and outer pipe hole portion are aligned at equal intervals around the central axis.

[0011] According to the above-mentioned configuration, the communication holes are formed at equal intervals around the inner tube and the outer tube, so that it is possible to prevent the flow of the carbon dioxide-containing gas that has flowed into the carbon dioxide adsorption layer from becoming biased.

[0012] In one aspect of the present disclosure, the inner pipe communication portion and the outer pipe communication portion may be configured so that their respective overlap timings, or overlap timings that occur every B times (B is an integer greater than or equal to 1), are the first or second overlap timings.

[0013] According to the above configuration, it is possible to suppress bias in the flow of the gas containing carbon dioxide that has flowed into the carbon dioxide adsorption layer. In one aspect of the present disclosure, the inner pipe communicating portion and the outer pipe communicating portion may be configured such that the first overlap timing and the second overlap timing occur alternately.

[0014] According to the above configuration, it is possible to suppress bias in the flow of the gas containing carbon dioxide that has flowed into the carbon dioxide adsorption layer. In one aspect of the present disclosure, the inner pipe may include C (C is an integer of 2 or more) inner pipe communicating parts arranged along the gas flow direction in the inner pipe. The outer pipe may include C outer pipe communicating parts arranged along the flow direction. Each inner pipe communicating part may correspond to one of the outer pipe communicating parts, and the corresponding inner pipe communicating part and the outer pipe communicating part may be configured such that at least two of the multiple inner pipe holes overlap with one of the outer pipe holes at least once in a rotation cycle. The corresponding inner pipe communicating part and the outer pipe communicating part may be the communicating part. The maximum value of the area of ​​the overlapping part of the inner pipe hole part and the outer pipe hole part may be the maximum communicating area. The maximum communicating area of ​​the communicating part may be equal to or larger than the maximum communicating area of ​​the communicating part adjacent to the downstream side in the gas flow direction, and the maximum communicating area of ​​at least one communicating part may be larger than the maximum communicating area of ​​the communicating part adjacent to the downstream side.

[0015] Since the pressure of the gas flowing through the inner tube decreases toward the downstream side, the speed of the gas passing through the upstream communication hole may become excessively high, and the speed of the gas passing through the downstream communication hole may become excessively low. In contrast, with the above-mentioned configuration, the speed of the gas passing through the upstream communication hole may be reduced, and the speed of the gas passing through the downstream communication hole may be increased. Therefore, it is possible to prevent the flow of the carbon dioxide-containing gas that has flowed into the carbon dioxide adsorption layer from becoming biased. [Brief description of the drawings]

[0016] [Figure 1] FIG. 1 is a perspective view of a carbon dioxide capture device according to a first embodiment. [Diagram 2] 1 is a cross-sectional view including a central axis of a carbon dioxide capture device according to a first embodiment. [Diagram 3] 3 is an explanatory diagram showing a plan view of a side wall of a half circumference of an inner tube in the first embodiment. FIG. [Figure 4] 3 is an explanatory diagram showing a plan view of a side wall of a half circumference of an outer tube in the first embodiment. FIG. [Diagram 5] 10 is an explanatory diagram of a cross section of a communication portion in the first embodiment at the time of a first overlap timing. FIG. [Figure 6] 10 is an explanatory diagram of a cross section of the communication portion in the first embodiment at the time of the second overlap timing. FIG. [Figure 7] 2 is a cross-sectional view of an inner tube and an outer tube showing the seal structure in the first embodiment. FIG. [Figure 8] 1 is a cross-sectional view including a central axis of a carbon dioxide capture device according to a first embodiment configured to rotate an inner tube. [Figure 9] 13 is a cross-sectional view including a central axis of a carbon dioxide capture device having a modified rotating portion. FIG. [Figure 10] 13 is an explanatory diagram of a cross section of a communication portion in a modified example. FIG. [Figure 11] 13 is an explanatory diagram showing a plan view of a side wall of a half circumference of an inner tube in a second embodiment. FIG. [Figure 12] 13 is an explanatory diagram showing a plan view of a side wall of a half circumference of an outer tube in a second embodiment. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. Note that the embodiments of the present disclosure are not limited to the following embodiments, and various forms may be adopted as long as they fall within the technical scope of the present disclosure.

[0018] [First embodiment] [1. Overview of the carbon dioxide capture device] The carbon dioxide capture device 1 of the first embodiment is installed in a facility such as a factory, a power plant, or a residence, and is configured to capture carbon dioxide contained in gas such as exhaust gas generated in the facility (see FIG. 1). Of course, the carbon dioxide capture device 1 is not limited to this, and may be mounted on a device (for example, a vehicle) that releases gas containing carbon dioxide, and capture the carbon dioxide contained in the gas discharged from the device. The carbon dioxide capture device 1 includes a container 2, an inner tube 3, and an outer tube 4. The inner tube 3 and the outer tube 4 rotate relatively around a central axis 1A, as will be described in detail later.

[0019] [2. Container] The container 2 of the carbon dioxide capture device 1 is cylindrical, and has first and second end faces 20, 21 located at both ends in the extension direction (see Figs. 1 and 2). Note that the container 2 is not limited to being cylindrical, and may have various shapes, such as a rectangular column. The central axis 1A passes through the center of a cross section of the container 2 perpendicular to the extension direction (hereinafter simply referred to as a cross section).

[0020] Further, an adsorption layer 23 that adsorbs carbon dioxide is provided inside the container 2. Specifically, the adsorption layer 23 may be composed of, for example, a granular or powdered carbon dioxide adsorbent. More specifically, the carbon dioxide adsorbent may be, for example, a granular solid that supports a liquid compound (e.g., an amine, etc.) that bonds with carbon dioxide, or may be an adsorbent such as activated carbon or zeolite.

[0021] A cylindrical outlet 24 that communicates with the inside of the container 2 is provided in the center of the first end surface 20 . A circular inlet hole 22 is provided at the center of second end face 21, penetrating second end face 21 and having its center positioned on central axis 1A.

[0022] As an example, the carbon dioxide capture device 1 is disposed in a state in which the first end surface 20 of the container 2 is located on the upper side and the second end surface 21 is located on the lower side. However, this is not limited thereto, and the carbon dioxide capture device 1 can be disposed in various orientations.

[0023] [3. Inner and outer pipes] The inner pipe 3 and the outer pipe 4 are pipes with a circular cross section, the outer pipe 4 is disposed outside the inner pipe 3, and the inner peripheral surface of the outer pipe 4 abuts or nearly abuts on the outer peripheral surface of the inner pipe 3 (see Figs. 1 and 2). As will be described in detail later, the outer pipe 4 rotates relatively to the inner pipe 3 about the central axis 1A.

[0024] The inner pipe 3 and the outer pipe 4 are disposed inside the container 2. That is, the inner pipe 3 and the outer pipe 4 are disposed so as to pass through an inlet hole 22 in a second end face 21 of the container 2 with the center of their cross sections positioned on the central axis 1A. First ends 3A, 4A of the inner pipe 3 and the outer pipe 4 are positioned near a first end face 20 inside the container 2 and are sealed by a wall portion. Second ends 3B, 4B of the inner pipe 3 and the outer pipe 4 are positioned outside the container 2.

[0025] The first end 4A of the outer tube 4 and the entire area of ​​the outer peripheral surface located inside the container 2 are covered with a breathable cover 25. The cover 25 may be a mesh-like member or a porous member. The cover 25 may be made of the same material as the inner tube 3 and the outer tube 4. The cover 25 abuts against the adsorption layer 23 inside the container 2. In this way, the adsorbent constituting the adsorption layer 23 does not abut against the outer tube 4, so that damage to the adsorbent due to rotation of the outer tube 4 can be suppressed. The cover 25 may not be provided and the outer peripheral surface of the outer tube 4 may directly abut against the adsorption layer 23.

[0026] A seal member 26 is provided adjacent to the second end face 21 so as to surround the outer tube 4. The seal member 26 is made of an elastic material such as rubber, and seals between the outer tube 4 and the edge of the second end face 21 surrounding the inlet hole 22.

[0027] In addition, the second end 3B of the inner pipe 3 is connected to a gas flow path (not shown). After flowing into the inner pipe 3, the gas from the flow path passes through inner pipe communicating parts 31A-31E formed in the side wall of the inner pipe 3 and outer pipe communicating parts 41A-41E formed in the side wall of the outer pipe (see FIGS. 3-6), and flows out to the adsorption layer 23. This brings the gas into contact with the adsorption layer 23, and carbon dioxide contained in the gas is adsorbed by the adsorption layer 23. The gas then flows out of the container 2 through the exhaust port 24.

[0028] [4. Inner tube position and outer tube position] A number of inner tube positions 30 and outer tube positions 40 are set in the inner tube 3 and outer tube 4, respectively, which are arranged at equal intervals around the central axis 1A (see Figs. 3 to 6). Note that A is an integer of 2 or more, and as an example, A=16.

[0029] Each inner pipe position 30 is set on a straight line extending parallel to the central axis 1A from the first end 3A to the second end 3B of the inner pipe 3. Similarly, each outer pipe position 40 is set on a straight line extending parallel to the central axis 1A from the first end 4A to the second end 4B of the outer pipe 4. In other words, the central angle of the arc-shaped cross section of the inner pipe 3 formed between two adjacent inner pipe positions 30, and the central angle of the arc-shaped cross section of the outer pipe 4 formed between two adjacent outer pipe positions 40, are 360° / A.

[0030] [5. Inner pipe communication part and outer pipe communication part] The inner pipe 3 has five inner pipe communicating portions 31A-31E (see FIG. 3). Each inner pipe communicating portion forms a predetermined section extending along the central axis 1A of the inner pipe 3, and A inner pipe positions 30 are set in each inner pipe communicating portion. Similarly, the outer pipe 4 has five outer pipe communicating portions 41A-41E (see FIG. 4). Each outer pipe communicating portion forms a predetermined section extending along the central axis 1A of the outer pipe 4, and A outer pipe positions 40 are set in each outer pipe communicating portion. The number of inner pipe communicating portions and the number of outer pipe communicating portions can be determined appropriately.

[0031] The inner pipe communicating portions 31A-31E and the outer pipe communicating portions 41A-41E are arranged in a line along the central axis 1A. Each inner pipe communicating portion is in one-to-one correspondence with one of the outer pipe communicating portions, and corresponding inner pipe communicating portions and outer pipe communicating portions are arranged in an overlapping state (FIGS. 5 and 6). In other words, the corresponding inner pipe communicating portions and outer pipe communicating portions are portions that form the same section along the central axis 1A in the inner pipe 3 and the outer pipe 4. Hereinafter, the corresponding inner pipe communicating portions and outer pipe communicating portions will also be referred to as communicating portions.

[0032] [6. Inner tube hole and outer tube hole] Each inner pipe communication portion has a plurality of (eight, for example) inner pipe holes 32 that communicate with the inside and outside of the inner pipe 3 (see Figs. 3, 5, and 6). In each inner pipe communication portion, each inner pipe hole 32 has the same shape and size. Also, as an example, the inner pipe hole 32 is configured as a single circular hole. Each inner pipe hole 32 is disposed at a different inner pipe position 30, and as an example, the center of each inner pipe hole 32 is located at the inner pipe position 30. However, the center of each inner pipe hole 32 may be located at a position other than the inner pipe position 30.

[0033] Each outer pipe communication portion has a plurality of (for example, 12) outer pipe holes 42 that communicate with the inside and outside of the outer pipe 4 (see Figs. 4 to 6). In each outer pipe communication portion, each outer pipe hole 42 has the same shape and size. As an example, each outer pipe hole 42 is configured as a single circular hole. Each outer pipe hole 42 is disposed at a different outer pipe position 40, and as an example, the center of each outer pipe hole 42 is located at the outer pipe position 40. However, the center of each outer pipe hole 42 may be located at a position other than the outer pipe position 40.

[0034] The inner pipe hole 32 and the outer pipe hole 42 may be configured as holes other than circular (e.g., polygonal holes) or may be configured as multiple holes. As an example, the size and shape of the inner pipe hole 32 and the outer pipe hole 42 in each communication portion are the same. However, this is not limited to this, and the size or shape of the inner pipe hole 32 and the outer pipe hole 42 may be different.

[0035] [6. Overlapping Timing] When the outer tube 4 is rotated by the rotating portion 5, an overlap timing occurs at each communication portion where each inner tube position 30 and each outer tube position 40 are aligned in the radial direction around the central axis 1A (see Figs. 5 and 6). In a rotation period in which the outer tube 4 makes one rotation, A overlap timings occur.

[0036] Each communication portion is configured so that the inner pipe hole 32 and the outer pipe hole 42 (hereinafter also referred to as communication holes) are formed in a communication state at each of at least two overlap timings (hereinafter referred to as first and second overlap timings) that occur in the rotation period. The communication state is a state in which the inner pipe hole 32 and the outer pipe hole 42 overlap. The number of communication holes at the first overlap timing (hereinafter also referred to as the first communication number) is greater than the number of communication holes at the second overlap timing (hereinafter also referred to as the second communication number).

[0037] Here, the area of ​​the overlapping portion of the inner pipe hole 32 and the outer pipe hole 42 that are in a communicated state is referred to as the communication area. Due to the rotation of the outer pipe 4, the communication state is formed before the overlap timing arrives, and the communication area gradually increases until the overlap timing arrives, at which point the communication area becomes maximum. After that, when the overlap timing passes, the communication area gradually decreases, and the communication state is eliminated. Note that, as an example, at the overlap timing, the entire area of ​​the inner pipe hole 32 that is in a communicated state overlaps with the entire area of ​​the outer pipe hole 42. However, this is not limited to this, and at the overlap timing, all or a part of the inner pipe hole 32 that is in a communicated state and all or a part of the outer pipe hole 42 may overlap.

[0038] [7. Layout pattern of inner and outer pipe holes] In the first embodiment, as an example, each inner pipe communication portion includes eight inner pipe holes 32 arranged at different inner pipe positions 30 according to a first pattern (see FIGS. 3, 5, and 6). In the first pattern, one inner pipe position 30 exists between each of the inner pipe positions 30 at which the inner pipe holes 32 are arranged.

[0039] Also, as an example, each outer pipe communication portion has 12 outer pipe holes 42 arranged at different outer pipe positions 40 according to the second pattern (see FIGS. 4 to 6). In the second pattern, four outer pipe positions 40 are provided at which no outer pipe hole portions 42 are arranged, and between these outer pipe positions 40, there are three outer pipe positions 40 at which outer pipe holes 42 are arranged.

[0040] At the first overlap timing shown in Fig. 5, the first communication number is, for example, eight, and the eight communication holes are arranged at equal intervals in the circumferential direction (hereinafter simply referred to as the circumferential direction) about the central axis 1A, with one inner pipe position 30 and one outer pipe position 40 present between the communication holes. At the second overlap timing shown in Fig. 6, the second communication number is, for example, four, and the four communication holes are arranged at equal intervals in the circumferential direction, with three inner pipe positions 30 and three outer pipe positions 40 present between the communication holes. In the rotation cycle, a communication state occurs at each overlap timing, and the first overlap timing and the second overlap timing occur alternately.

[0041] It is also possible to arrange 12 inner pipe holes 32 for each inner pipe communication portion according to the second pattern, and 8 outer pipe holes 42 for each outer pipe communication portion according to the first pattern. Even in such a case, the first and second overlap timings alternate in the same manner.

[0042] [8. Details of inner and outer pipe holes] In the first embodiment, as an example, the areas of the inner pipe hole 32 and the outer pipe hole 42 in the communication part gradually increase toward the upstream side in the gas flow direction. Therefore, the communication area that becomes maximum due to the arrival of the overlap timing in the communication part (hereinafter also referred to as the maximum communication area) gradually increases toward the upstream side.

[0043] Note that there may be provided a plurality of adjacent communication parts in which the areas of the inner pipe hole part 32 and the outer pipe hole part 42 are the same. That is, for example, the areas of the inner pipe hole part 32 and the outer pipe hole part 42 of X communication parts (X is an integer between 1 and 4) arranged from the most upstream side may be set to the same value Y, and the areas of the inner pipe hole part 32 and the outer pipe hole part 42 of the remaining communication parts may be set to the same value Z. Furthermore, the maximum communication area of ​​the X communication parts may also be Y, and the maximum communication area of ​​the remaining communication parts may also be Z. Y may be a value larger than Z.

[0044] In other words, the maximum communication area of ​​each communication section that is not located at the most downstream side may be greater than or equal to the maximum communication area of ​​the communication section adjacent to the downstream side of the communication section, while the maximum communication area of ​​at least one communication section may be greater than the maximum communication area of ​​the communication section adjacent to the downstream side of the communication section.

[0045] Furthermore, without being limited thereto, the areas of the inner pipe hole portion 32 and the outer pipe hole portion 42 in each communication portion may be the same. [9. Sealing structure of inner pipe hole] As shown in FIG. 7, a seal structure may be provided in each of the inner pipe holes 32 in the inner pipe 3 .

[0046] That is, a seal member 33 is provided on the edge surrounding each inner pipe hole 32. The seal member 33 is made of an elastic material such as rubber, and is provided around the entire edge of the inner pipe hole 32. Part of the seal member 33 protrudes onto the outer and inner surfaces of the inner pipe 3, and these parts are also provided around the entire edge of the inner pipe hole 32.

[0047] In addition, in the outer pipe 4, a first recess 44 recessed toward the inner pipe 3 is provided on the edge surrounding each outer pipe hole 42. The first recess 44 is provided around the entire circumference of the edge of the outer pipe hole 42.

[0048] Further, a second recess 45 recessed toward the inner pipe 3 is provided at an outer pipe position 40 in the outer pipe 4 where the outer pipe hole 42 is not provided. Then, when the inner pipe hole 32 and the outer pipe hole 42 are in communication with each other at the overlapping timing, the first recess 44 of the outer pipe hole 42 presses the seal member 33 of the inner pipe hole 32. This seals the gap between the edge of the inner pipe hole 32 and the edge of the outer pipe hole 42, and prevents gas flowing out from the inner pipe hole 32 from entering between the inner pipe 3 and the outer pipe 4.

[0049] On the other hand, at the overlapping timing, the second recess 45 of the outer pipe 4 closes the inner pipe hole 32 provided at the inner pipe position 30 that is aligned radially with the outer pipe position 40 of the second recess 45. At this time, the second recess 45 presses the seal member 33 of the inner pipe hole 32, thereby sealing the gap between the edge of the inner pipe hole 32 and the inner surface of the outer pipe 4, and it is possible to prevent gas flowing out from the inner pipe hole 32 from entering between the inner pipe 3 and the outer pipe 4.

[0050] When the above-mentioned seal structure is provided, a small gap is formed between the inner pipe 3 and the outer pipe 4. Moreover, the inner pipe 3 and the outer pipe 4 do not necessarily need to be provided with the above-mentioned seal structure.

[0051] [10. Rotating part] The rotating unit 5 includes a power source such as a motor. A rod-shaped portion 43 extending radially along the second end face 21 is provided on the outer circumferential surface of the outer tube 4 (see FIG. 2). The rotating unit 5 rotates the outer tube 4 via the rod-shaped portion 43 without rotating the inner tube 3.

[0052] The rotating unit 5 can appropriately adjust the rotation speed of the outer tube 4. Specifically, the rotating unit 5 may rotate the outer tube 4 at a constant speed, for example. In addition, the rotating unit 5 may temporarily suspend the rotation of the outer tube 4 for a certain period at the overlap timing, or may temporarily suspend the rotation of the outer tube 4 for a certain period at the overlap timing at which the communication state occurs.

[0053] Alternatively, the rotating part 5 may rotate the inner pipe 3 about the central axis 1A instead of the outer pipe 4. That is, a rod-shaped part 34 extending radially along the second end face 21 is provided on the outer circumferential surface of the inner pipe 3 (see FIG. 8). The rotating part 5 rotates the inner pipe 3 via the rod-shaped part 34 without rotating the outer pipe 4.

[0054] In this case, the cover 25 of the outer tube 4 may not be provided, and the outer tube 4 may be directly in contact with the adsorption layer 23 of the container 2 . Further, the second end 3B of the inner pipe 3 is connected to a joint 35, and the inner pipe 3 is connected via the joint 35 to a pipe 27 that allows gas to flow downward toward the inner pipe 3. The joint 35 has a seal structure that prevents the outflow of gas flowing from the pipe 27 into the inner pipe 3, and is configured to allow the second end 3B of the rotating inner pipe 3 to slide.

[0055] In addition, the rotating part 5 may have a gear 50 adjacent to the second end 4B of the outer pipe 4 and arranged to rotate around the outer circumferential surface of the outer pipe 4 (see FIG. 9). The rotating part 5 may transmit power from a motor or the like via the gear 50 to rotate the outer pipe 4 relative to the inner pipe 3. In this case, the inner pipe 3 may extend upstream of the gear 50, or may be connected to a pipe at the position of the gear 50. It is also preferable to provide a seal part around the gear 50 to seal a gap between the inner circumferential surface of the outer pipe 4 and the outer circumferential surface of the inner pipe 3.

[0056] Alternatively, the second end 3B of the inner pipe 3 may be disposed upstream of the second end 4B of the outer pipe 4, and the gear 50 of the rotating unit 5 may be provided at a position upstream of the second end 4B of the outer pipe 4 on the outer circumferential surface of the inner pipe 3. The rotating unit 5 may transmit power from a motor or the like via the gear 50 to rotate the inner pipe 3 relative to the outer pipe 4.

[0057] [11. Modifications] A, which is the number of inner pipe positions and outer pipe positions, the number and arrangement pattern of the inner pipe holes 32, and the number and arrangement pattern of the outer pipe holes 42 can be set appropriately.

[0058] Specifically, for example, A may be set to 3, and the number of the inner pipe holes 32 and the outer pipe holes 42 may be set to 2. In such a case, in the rotation period, the first overlap timing where the first communication number is 2 occurs once, and the second overlap timing where the second communication number is 1 occurs twice.

[0059] Also, for example, A may be 16, the number of inner pipe holes 32 may be 4, and the number of outer pipe holes 42 may be 6 (see FIG. 10). Then, according to the arrangement pattern shown in FIG. 10, the inner pipe holes 32 may be arranged at the inner pipe positions 30, and the outer pipe holes 42 may be arranged at the outer pipe positions 40.

[0060] In such a case, in the rotation period, the first overlap timing where the first communication number is four occurs four times, and the second overlap timing where the second communication number is two occurs four times. Furthermore, at the first overlap timing, the four communication holes are arranged at equal intervals in the circumferential direction, and there are three inner pipe positions 30 and three outer pipe positions 40 between the communication holes. Furthermore, at the second overlap timing, two communication holes are arranged at equal intervals in the circumferential direction, and there are seven inner pipe positions 30 and seven outer pipe positions 40 between the communication holes. Furthermore, at every other overlap timing, a communication state is formed.

[0061] In addition, the number of inner pipe holes 32 may be six and the number of outer pipe holes 42 may be four, and the outer pipe holes 42 may be arranged at the outer pipe positions 40 according to the arrangement pattern of the inner pipe holes 32 in Figure 10, and the inner pipe holes 32 may be arranged at the inner pipe positions 30 according to the arrangement pattern of the outer pipe holes 42 in Figure 10.

[0062] In addition, the number of times the first and second overlap timings occur in a rotation cycle, the number of first and second communication times, and the intervals at which the communication state occurs can be appropriately determined by adjusting A and the number and arrangement pattern of the inner pipe holes 32 and the outer pipe holes 42. It is preferable to perform the above adjustments so that the communication holes are arranged at equal intervals in the circumferential direction, the first and second overlap timings occur alternately, and the communication state occurs at each overlap timing or at overlap timings that occur every B times (B is an integer equal to or greater than 1).

[0063] [Second embodiment] [12. Differences] The carbon dioxide capture device 1 of the second embodiment differs from the first embodiment in the configurations of the inner pipe hole portion and the outer pipe hole portion. The following will mainly describe the differences between the carbon dioxide capture device 1 of the second embodiment and the first embodiment.

[0064] In the second embodiment, A, which is the number of inner pipe positions 36 and outer pipe positions 46, is 6 (see FIGS. 11 and 12). Of course, the value of A can be determined appropriately. Also in the second embodiment, similar to the first embodiment, five inner pipe communicating portions 37A-37E are provided in the inner pipe 3, and five outer pipe communicating portions 47A-47E are provided in the outer pipe 4. Also in the second embodiment, similar to the first embodiment, each communicating portion has a plurality of (six, for example) inner pipe holes 38 and outer pipe holes 48, and these holes have the same shape and size.

[0065] However, in the second embodiment, the inner pipe hole 38 and the outer pipe hole 48 are formed in an elongated shape extending in the circumferential direction (for example, an elliptical shape), for example. Of course, the shapes of the inner pipe hole 38 and the outer pipe hole 48 may be rectangular shapes extending in the circumferential direction, and are not limited to shapes extending in the circumferential direction, and may be, for example, circular or square. Also, in the second embodiment, an inner pipe hole 38 is disposed at each inner pipe position 36, and an outer pipe hole 48 is disposed at each outer pipe position 46.

[0066] In the second embodiment, at each overlap timing, the inner pipe holes 38 and the outer pipe holes 48 in the communication portion communicate with each other. At each overlap timing, the edge of the inner pipe hole 38 and the edge of the outer pipe hole 48 in the communication portion overlap with each other, and the communication area becomes maximum.

[0067] As in the first embodiment, the areas of the inner pipe hole 38 and the outer pipe hole 48 increase toward the upstream side in the gas flow direction. Therefore, the maximum communication area of ​​the communication portion increases sequentially toward the upstream side.

[0068] However, similarly to the first embodiment, there may be provided a plurality of adjacent communication parts having the same maximum communication area between the inner pipe hole part 38 and the outer pipe hole part 48. In other words, the maximum communication area of ​​each communication part that is not located on the most downstream side may be set to be equal to or larger than the maximum communication area of ​​the communication part adjacent to the downstream side of the communication part, while the maximum communication area of ​​at least one communication part may be set to be larger than the maximum communication area of ​​the communication part adjacent to the downstream side of the communication part.

[0069] In the second embodiment, the value of A, the number of communication parts, and the number of inner pipe holes 38 and outer pipe holes 48 can be determined as appropriate. Specifically, the value of A and the number of inner pipe holes 38 and outer pipe holes 48 may be set to 2. Even in the case of such a configuration, two communication holes are formed at two overlapping times in the rotation cycle.

[0070] [13. Effects] (1) According to the first and second embodiments, when communication holes are formed by the relative rotation of the inner tube 3 and the outer tube 4, the gas that has flowed into the inner tube 3 passes through the communication holes and flows out to the adsorption layer 23. Then, in each communication part that is in a communication state, the sum of the communication areas (hereinafter also referred to as the total communication area) changes, and the speed of the gas passing through the communication holes changes. This allows the gas to flow toward a region in the adsorption layer 23 that is relatively close to the outer tube 4 (hereinafter also referred to as the proximal region) and a region in the adsorption layer 23 that is relatively far from the outer tube 4 (hereinafter also referred to as the distal region). Therefore, it is possible to suppress bias in the flow of the gas containing carbon dioxide that has flowed into the adsorption layer 23.

[0071] Also, for example, the speed of the gas flowing into the adsorption layer 23 can be changed with a simple configuration without using a blower or the like. (2) According to the first embodiment, the number of communication holes formed differs between the first and second overlapping times, resulting in a different total communication area. Therefore, the speed of gas passing through the communication holes differs between the first and second overlapping times, causing the gas to flow toward the proximal and distal regions of the adsorption layer 23. This makes it possible to prevent the flow of the gas containing carbon dioxide that has flowed into the adsorption layer 23 from becoming biased.

[0072] (3) In addition, at the first and second overlapping times, the communication holes are arranged at equal intervals in the circumferential direction, which makes it possible to prevent the flow of gas that has flowed out to the adsorption layer 23 from becoming uneven. (4) In addition, each time the overlap timing occurs, a communication hole is formed, so that the gas flows into the adsorption layer 23 at regular intervals, and the flow of the gas that flows into the adsorption layer 23 can be prevented from becoming uneven.

[0073] (5) Moreover, the first and second overlapping timings occur alternately. Therefore, the gas flows alternately toward the proximal region and the distal region of the adsorption layer 23. Therefore, it is possible to prevent the flow of the gas flowing into the adsorption layer 23 from becoming biased.

[0074] (6) In addition, the maximum communication area of ​​the communication part decreases toward the downstream side. Therefore, the speed of gas passing through the communication hole on the upstream side can be reduced, and the speed of gas passing through the communication hole on the downstream side can be increased. Therefore, the bias of the flow of gas flowing into the adsorption layer 23 can be suppressed.

[0075] [14. Other embodiments] (1) In the first and second embodiments, each communication portion is set with a common inner pipe position 30, 36 and outer pipe position 40, 46. However, this is not limited thereto, and each communication portion may be set with a unique inner pipe position 30, 36 and outer pipe position 40, 46 corresponding to the communication portion.

[0076] (2) In the first and second embodiments, the rotating unit 5 may change the rotation direction of the inner tube 3 and the outer tube 4. That is, in the first embodiment, for example, after the first or second overlap timing arrives, the inner tube 3 and the outer tube 4 rotate relatively by X°, and when the first or second overlap timing arrives again, the rotating unit 5 may change the rotation direction. Then, when the inner tube 3 and the outer tube 4 rotate relatively by X° again, the rotating unit 5 may change the rotation direction. Here, X° is (360° / A)×N (N is an integer of 1 or more). Also, in the second embodiment, for example, after the overlap timing arrives, the inner tube 3 and the outer tube 4 rotate relatively by X°, and when the overlap timing arrives, the rotating unit 5 may change the rotation direction. Then, when the inner tube 3 and the outer tube 4 rotate relatively by X° again, the rotating unit 5 may change the rotation direction.

[0077] (3) Multiple functions possessed by one component in the above embodiments may be realized by multiple components, or one function possessed by one component may be realized by multiple components. Also, multiple functions possessed by multiple components may be realized by one component, or one function realized by multiple components may be realized by one component. Also, part of the configuration of the above embodiments may be omitted. Also, at least part of the configuration of the above embodiments may be added to or substituted for the configuration of another of the above embodiments. [Explanation of symbols]

[0078] 1...Carbon dioxide recovery device, 1A...center axis, 2...container, 23...adsorption layer, 3...inner tube, 30, 36...inner tube position, 31A~31E, 37A~37E...inner tube communication Section, 32, 38...Inner tube hole section, 4...Outer tube, 40, 46...Outer tube position, 41A~41E, 47A~47E...Outer tube communication section, 42, 48...Outer tube hole section, 5...Rotating section.

Claims

1. 1. A carbon dioxide capture device, comprising: An inner pipe configured to allow a gas containing carbon dioxide to flow in from the outside of the carbon dioxide capture device; an outer tube arranged to surround an outer peripheral surface of the inner tube; an adsorption layer disposed around an outer circumferential surface of the outer tube and configured to adsorb carbon dioxide contained in the gas; a rotating unit configured to rotate the outer tube relative to the inner tube about a central axis, the inner pipe includes an inner pipe communication portion, the inner pipe communication portion communicating an inside and an outside of the inner pipe and including a plurality of inner pipe holes arranged at intervals in a circumferential direction around the central axis, the outer pipe includes an outer pipe communication portion, the outer pipe communication portion communicating an inside and an outside of the outer pipe and including a plurality of outer pipe holes arranged at intervals in the circumferential direction, the inner pipe communicating portion and the outer pipe communicating portion are configured such that at least two of the plurality of inner pipe holes overlap with any one of the outer pipe holes at least once during a rotation cycle in which the outer pipe rotates once relative to the inner pipe by the rotating portion, The gas inside the inner tube passes through the overlapping inner tube hole and outer tube hole and reaches the adsorption layer. Carbon dioxide capture equipment.

2. The carbon dioxide capture device according to claim 1, the inner pipe communication portion is provided with A inner pipe positions (A is an integer of 3 or more) that are equally spaced and arranged around the central axis, and at least two of the A inner pipe positions are provided with inner pipe hole portions; the outer pipe communication portion is provided with A outer pipe positions arranged at equal intervals around the central axis, and at least two of the A outer pipe positions are provided with outer pipe holes; A timing at which each of the inner tube positions and each of the outer tube positions are aligned in a radial direction from the central axis is defined as an overlap timing, the inner pipe communicating portion and the outer pipe communicating portion are configured such that at least one inner pipe hole portion overlaps with one of the outer pipe hole portions at first and second overlap timings among A overlap timings that occur in the rotation period, A first communication number, which is the number of the inner pipe holes and the outer pipe holes that overlap at the first overlapping timing, is different from a second communication number, which is the number of the inner pipe holes and the outer pipe holes that overlap at the second overlapping timing. Carbon dioxide capture equipment.

3. The carbon dioxide capture device according to claim 2, The first and second communication numbers are plural, The inner pipe communicating portion and the outer pipe communicating portion are configured such that, at the first and second overlapping timings, the inner pipe positions and the outer pipe positions in the overlapping inner pipe hole portion and the outer pipe hole portion are aligned so as to rotate around the central axis at equal intervals. Carbon dioxide capture equipment.

4. The carbon dioxide capture device according to claim 2 or 3, At each overlap timing, at least one inner pipe hole portion overlaps with any of the outer pipe holes, or at least one inner pipe hole portion overlaps with any of the outer pipe holes at overlap timings that occur every B predetermined times (B is an integer equal to or greater than 1). Carbon dioxide capture equipment.

5. The carbon dioxide recovery device according to any one of claims 2 to 4, The inner pipe communicating portion and the outer pipe communicating portion are configured such that the first overlap timing and the second overlap timing occur alternately. Carbon dioxide capture equipment.

6. The carbon dioxide capture device according to any one of claims 1 to 5, The inner pipe includes C (C is an integer of 2 or more) inner pipe communication portions arranged along a flow direction of the gas in the inner pipe, The outer pipe includes C outer pipe communication portions arranged along the flow direction, each of the inner pipe communicating portions is associated with one of the outer pipe communicating portions, and the corresponding inner pipe communicating portion and the outer pipe communicating portion are configured such that at least two of the plurality of inner pipe hole portions overlap one of the outer pipe hole portions at least once in the rotation cycle; The corresponding inner pipe communicating portion and the outer pipe communicating portion are defined as communicating portions, The maximum value of the area of ​​the overlapping portion of the inner pipe hole portion and the outer pipe hole portion is defined as the maximum communication area, The maximum communication area of ​​the communication part is equal to or larger than the maximum communication area of ​​the communication part adjacent to the downstream side in the gas flow direction, and the maximum communication area of ​​at least one communication part is larger than the maximum communication area of ​​the communication part adjacent to the downstream side. Carbon dioxide capture equipment.

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