JP7616982B2 - Carbon Dioxide Capture Equipment - Google Patents

Description

This disclosure relates to a carbon dioxide capture device.

The CO2 absorption device described in Patent Document 1 has a cylindrical device body on which a rotating shaft with a screw blade is arranged, and the device body contains lithium silicate, which is a CO2 adsorbent. 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.

JP 2011-161332 A

However, simply injecting exhaust gas from multiple nozzles on the rotating shaft can cause the flow of exhaust gas to become biased, which can prevent the exhaust gas from reaching the entire area of the adsorbent placed in the device body. This can result in the adsorbent not being able to effectively adsorb CO2.

One aspect of the present disclosure aims to prevent bias in the flow of gas that flows into the carbon dioxide adsorption layer.

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

According to the above configuration, the total area of the overlapping portions of the multiple inner tube holes and multiple outer tube holes (hereinafter also referred to as the total communication area) changes due to the relative rotation of the outer tube and the inner tube. This causes the speed of the gas passing through the overlapping inner tube holes and outer tube holes (hereinafter also referred to as the communication holes) to change. This makes it possible to suppress bias in the flow of gas containing carbon dioxide that has flowed into the carbon dioxide adsorption layer.

In one aspect of the present disclosure, the inner pipe communication section is 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 communication section is 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 communication section and the outer pipe communication section 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. The first communication number, which is the number of inner pipe holes and outer pipe holes that overlap at the first overlap timing, and the second communication number, which is the number of inner pipe holes and outer pipe holes that overlap at the second overlap timing, may be different.

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

In one aspect of the present disclosure, the first and second communication numbers may be multiple. 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 the outer pipe hole portion are aligned at equal intervals around the central axis.

According to the above configuration, the communication holes are formed at equal intervals around the inner and outer tubes. This makes it possible to prevent bias in the flow of gas containing carbon dioxide that has flowed into the carbon dioxide adsorption layer.

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

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.

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 communication parts arranged along the gas flow direction in the inner pipe. The outer pipe may include C outer pipe communication parts arranged along the flow direction. Each inner pipe communication part may be associated with one of the outer pipe communication parts, and the corresponding inner pipe communication part and outer pipe communication 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 communication part and outer pipe communication part may be communication parts. The maximum value of the area of the overlapping part in the inner pipe hole part and the outer pipe hole part may be the maximum communication area. The maximum communication area of the communication part may be 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 may be larger than the maximum communication area of the communication part adjacent to the downstream side.

The pressure of the gas flowing through the inner tube decreases as it moves downstream, so there is a risk that the speed of the gas passing through the upstream communication hole will be excessively high, or the speed of the gas passing through the downstream communication hole will be excessively low. In contrast, with the above configuration, it is possible to reduce the speed of the gas passing through the upstream communication hole, or to increase the speed of the gas passing through the downstream communication hole. Therefore, it is possible to prevent the flow of gas containing carbon dioxide that has flowed into the carbon dioxide adsorption layer from becoming biased.

FIG. 1 is a perspective view of a carbon dioxide capture device according to a first embodiment. 2 is a cross-sectional view including a central axis in the carbon dioxide capture device of the first embodiment. FIG. 4 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. 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. 10 is an explanatory diagram of a cross section of a communication portion in the first embodiment at a first overlap timing. FIG. 11 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. 2 is a cross-sectional view of an inner tube and an outer tube showing a seal structure in the first embodiment. FIG. 3 is a cross-sectional view including a central axis of the carbon dioxide capture device of the first embodiment configured to rotate an inner tube. FIG. 13 is a cross-sectional view including a central axis of a carbon dioxide capture device having a modified rotating portion. FIG. 13 is an explanatory diagram of a cross section of a communication portion in a modified example. FIG. 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. 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.

Embodiments of the present disclosure will be described below with reference to the drawings. Note that the embodiments of the present disclosure are not limited to the following embodiments, and may take various forms as long as they fall within the technical scope of the present disclosure.

[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 (e.g., 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.

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 (hereinafter simply referred to as a cross section) of the container 2 that is perpendicular to the extension direction.

In addition, 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 carries a liquid compound (e.g., an amine, etc.) that binds to carbon dioxide, or may be an adsorbent such as activated carbon or zeolite.

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.

As an example, the carbon dioxide capture device 1 is arranged with the first end surface 20 of the container 2 positioned on the upper side and the second end surface 21 positioned on the lower side. However, this is not limited to this, and the carbon dioxide capture device 1 can be arranged in various orientations.

[3. Inner and outer tubes]
The inner pipe 3 and the outer pipe 4 are pipes having 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.

The inner tube 3 and the outer tube 4 are disposed inside the container 2. That is, the inner tube 3 and the outer tube 4 are disposed so as to pass through the inlet hole 22 in the second end face 21 of the container 2 with the center of the cross section located on the central axis 1A. The first ends 3A, 4A of the inner tube 3 and the outer tube 4 are located near the first end face 20 inside the container 2 and are sealed by a wall portion. In addition, the second ends 3B, 4B of the inner tube 3 and the outer tube 4 are located outside the container 2.

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 material or a porous material. 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 abut directly against the adsorption layer 23.

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 that surrounds the inlet hole 22.

The second end 3B of the inner tube 3 is connected to a gas flow path (not shown). After flowing into the inner tube 3, the gas passes through inner tube communication parts 31A-31E formed in the side wall of the inner tube 3 and outer tube communication parts 41A-41E formed in the side wall of the outer tube (see Figures 3-6), and flows out to the adsorption layer 23. This brings the gas into contact with the adsorption layer 23, and the 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.

[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). Here, A is an integer equal to or greater than 2, and as an example, A=16.

Each inner tube 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 tube 3. Similarly, each outer tube 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 tube 4. In other words, the central angle of the arc-shaped cross section of the inner tube 3 formed between two adjacent inner tube positions 30, and the central angle of the arc-shaped cross section of the outer tube 4 formed between two adjacent outer tube positions 40, are 360°/A.

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

The inner pipe communication parts 31A-31E and the outer pipe communication parts 41A-41E are arranged in a line along the central axis 1A. Each inner pipe communication part is in one-to-one correspondence with one of the outer pipe communication parts, and corresponding inner pipe communication parts and outer pipe communication parts are arranged in an overlapping state (Figs. 5 and 6). In other words, corresponding inner pipe communication parts and outer pipe communication parts are parts that form the same section along the central axis 1A in the inner pipe 3 and outer pipe 4. Hereinafter, corresponding inner pipe communication parts and outer pipe communication parts are also referred to as communication parts.

[6. Inner tube hole and outer tube hole]
Each of the inner pipe communication portions has a plurality of (eight, for example) inner pipe holes 32 that communicate between the inside and outside of the inner pipe 3 (see FIGS. 3, 5, and 6). Each of the inner pipe holes 32 has the same shape and size. In addition, as an example, the inner pipe hole 32 is configured as a single circular hole. The inner pipe holes 32 are arranged at different inner pipe positions 30. 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 any position other than the inner pipe position 30. It may be located.

Each outer pipe communication section has multiple (for example, 12) outer pipe holes 42 that communicate between the inside and outside of the outer pipe 4 (see Figures 4 to 6). In each outer pipe communication section, 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.

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 section 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.

6. Overlap 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 about the central axis 1A (see FIGS. 5 and 6). In a rotation period in which the outer tube 4 rotates once, A overlap timings occur.

Each communication section 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 the first and second overlap timings) that occur in the rotation cycle. 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).

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

[7. Arrangement pattern of inner tube hole portion and outer tube hole portion]
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.

As another 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 Figures 4 to 6). In the second pattern, four outer pipe positions 40 are provided at which no outer pipe holes 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.

At the first overlap timing shown in FIG. 5, the first communication number is, for example, 8, and the eight communication holes are arranged at equal intervals in the circumferential direction (hereinafter simply referred to as the circumferential direction) centered on the central axis 1A, with one inner tube position 30 and one outer tube position 40 between the communication holes. At the second overlap timing shown in FIG. 6, the second communication number is, for example, 4, and the four communication holes are arranged at equal intervals in the circumferential direction, with three inner tube positions 30 and three outer tube positions 40 between the communication holes. In addition, in the rotation cycle, a communication state occurs at each overlap timing, and the first overlap timing and the second overlap timing occur alternately.

It is also possible to arrange 12 inner pipe holes 32 for each inner pipe connection according to the second pattern, and 8 outer pipe holes 42 for each outer pipe connection according to the first pattern. Even in such a case, the first and second overlap timings occur alternately in the same manner.

[8. Details of the inner pipe hole and the outer pipe hole]
In the first embodiment, as an example, the areas of the inner pipe hole 32 and the outer pipe hole 42 in the communication portion become larger in sequence 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 portion (hereinafter, also referred to as the maximum communication area) becomes larger in sequence toward the upstream side.

Note that there may be multiple adjacent communication sections in which the areas of the inner pipe hole section 32 and the outer pipe hole section 42 are the same. That is, for example, the areas of the inner pipe hole section 32 and the outer pipe hole section 42 of the X communication sections (X is an integer between 1 and 4) lined up from the most upstream side may be set to the same value Y, and the areas of the inner pipe hole section 32 and the outer pipe hole section 42 of the remaining communication sections may be set to the same value Z. Furthermore, the maximum communication area of the X communication sections may also be Y, and the maximum communication area of the remaining communication sections may also be Z. Y may also be a value greater than Z.

In other words, the maximum communication area of each communication section that is not located on the most downstream side may be equal to or greater than 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.

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 correspondence with each inner pipe hole 32 in the inner pipe 3 .

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. Also, a portion of the seal member 33 protrudes onto the outer and inner surfaces of the inner pipe 3, and these portions are also provided around the entire edge of the inner pipe hole 32.

In addition, in the outer pipe 4, a first recess 44 that recesses 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 edge of the outer pipe hole 42.

Further, a second recess 45 recessed toward the inner pipe 3 is provided at an outer pipe position 40 where the outer pipe hole 42 is not provided in the outer pipe 4 .
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.

Meanwhile, at the overlapping timing, the second recess 45 of the outer pipe 4 blocks 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 the gas flowing out from the inner pipe hole 32 can be prevented from entering between the inner pipe 3 and the outer pipe 4.

When the above-mentioned sealing structure is provided, a small gap is formed between the inner tube 3 and the outer tube 4. Also, the above-mentioned sealing structure does not have to be provided on the inner tube 3 and the outer tube 4.

[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.

The rotating unit 5 can adjust the rotation speed of the outer tube 4 as appropriate. Specifically, the rotating unit 5 can rotate the outer tube 4 at a constant speed, for example. The rotating unit 5 can also temporarily suspend the rotation of the outer tube 4 for a certain period at the overlap timing, or temporarily suspend the rotation of the outer tube 4 for a certain period at the overlap timing where the communication state occurs.

In addition, the rotating unit 5 may rotate the inner tube 3 around the central axis 1A instead of the outer tube 4. That is, a rod-shaped portion 34 extending radially along the second end face 21 is provided on the outer peripheral surface of the inner tube 3 (see FIG. 8). The rotating unit 5 then rotates the inner tube 3 via the rod-shaped portion 34 without rotating the outer tube 4.

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 coupling part 35, and the inner pipe 3 is connected via the coupling part 35 to a pipe 27 that allows gas to flow downward toward the inner pipe 3. The coupling part 35 has a seal structure that suppresses 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.

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 the pipe at the position of the gear 50. It is also preferable to provide a seal part around the gear 50 to seal the gap between the inner circumferential surface of the outer pipe 4 and the outer circumferential surface of the inner pipe 3.

In addition, the second end 3B of the inner tube 3 may be located upstream of the second end 4B of the outer tube 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 tube 4 on the outer peripheral surface of the inner tube 3. The rotating unit 5 may transmit power from a motor or the like via the gear 50 to rotate the inner tube 3 relative to the outer tube 4.

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.

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

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 position 30, and the outer pipe holes 42 may be arranged at the outer pipe position 40.

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

The number of inner pipe holes 32 may be six, the number of outer pipe holes 42 may be four, and the outer pipe holes 42 may be arranged at the outer pipe position 40 according to the arrangement pattern of the inner pipe holes 32 in FIG. 10, while the inner pipe holes 32 may be arranged at the inner pipe position 30 according to the arrangement pattern of the outer pipe holes 42 in FIG. 10.

In addition, by adjusting A and the number and arrangement pattern of the inner pipe hole portions 32 and the outer pipe hole portions 42, the number of times the first and second overlap timings occur in the rotation cycle, the number of first and second connections, and the interval at which the connection state occurs can be appropriately determined. 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, or the connection 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).

[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 mainly describes the differences between the carbon dioxide capture device 1 of the second embodiment and the first embodiment.

In the second embodiment, A, which is the number of inner pipe positions 36 and outer pipe positions 46, is 6 (see Figures 11 and 12). Of course, the value of A can be determined as appropriate. Also, in the second embodiment, as in the first embodiment, five inner pipe communication sections 37A-37E are provided in the inner pipe 3, and five outer pipe communication sections 47A-47E are provided in the outer pipe 4. Also, in the second embodiment, as in the first embodiment, each communication section has multiple (six, for example) inner pipe holes 38 and outer pipe holes 48, and these holes have the same shape and size.

However, in the second embodiment, the inner pipe hole portion 38 and the outer pipe hole portion 48 are formed in an elongated shape extending in the circumferential direction (for example, an elliptical shape), as an example. Of course, the shapes of the inner pipe hole portion 38 and the outer pipe hole portion 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 portion 38 is arranged at each inner pipe position 36, and an outer pipe hole portion 48 is arranged at each outer pipe position 46.

In the second embodiment, at each overlap timing, the inner pipe hole portions 38 and the outer pipe hole portions 48 in the communication portion are in a communication state. Also, at each overlap timing, the edge of the inner pipe hole portion 38 and the edge of the outer pipe hole portion 48 in the communication state overlap in each communication portion, and the communication area is maximized.

Also, 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 section increases sequentially toward the upstream side.

However, similar to the first embodiment, multiple adjacent communication sections may be provided in which the maximum communication area of the inner pipe hole section 38 and the outer pipe hole section 48 is the same. In other words, the maximum communication area of each communication section that is not located on the most downstream side may be set to be equal to or greater than 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 set to be greater than the maximum communication area of the communication section adjacent to the downstream side of the communication section.

In the second embodiment, the value of A, the number of communicating 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 can be set to 2. Even in the case of such a configuration, two communicating holes are formed at two overlapping times in the rotation cycle.

[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 communicated 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.

Furthermore, 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 is different at each of the first and second overlapping times, and the total communication area is different. Therefore, the speed of gas passing through the communication holes is different at each of the first and second overlapping times, and the gas flows out toward the proximal region and the distal region of the adsorption layer 23. Therefore, it is possible to suppress bias in the flow of the gas containing carbon dioxide that flows out to the adsorption layer 23.

(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 flowing into the adsorption layer 23 from becoming uneven.
(4) In addition, a communication hole is formed each time the overlap timing occurs, so that gas flows into the adsorption layer 23 at regular intervals, and it is possible to prevent the flow of gas that flows into the adsorption layer 23 from becoming biased.

(5) In addition, the first and second overlap timings occur alternately. Therefore, 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 gas flowing into the adsorption layer 23 from becoming biased.

(6) In addition, the maximum communication area of the communication section decreases toward the downstream side. This makes it possible to reduce the speed of gas passing through the communication hole on the upstream side and to increase the speed of gas passing through the communication hole on the downstream side. This makes it possible to prevent the flow of gas flowing into the adsorption layer 23 from becoming biased.

14. Other embodiments
(1) In the first and second embodiments, each communication portion is set to 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 to a unique inner pipe position 30, 36 and outer pipe position 40, 46 corresponding to the communication portion.

(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. Note that 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.

(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.

1... Carbon dioxide recovery device, 1A... Central axis, 2... Container, 23... Adsorption layer, 3... Inner tube, 30, 36... Inner tube position, 31A to 31E, 37A to 37E... Inner tube communication Part, 32, 38... Inner tube hole part, 4... Outer tube, 40, 46... Outer tube position, 41A to 41E, 47A to 47E... Outer tube communication part, 42, 48... Outer tube hole part, 5... Rotating part .

Claims (6)

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. 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 hole portions;
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 carbon dioxide recovery device in which a first communication number, which is the number of inner pipe holes and outer pipe holes that overlap at the first overlap timing, is 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. The carbon dioxide capture device according to claim 2,
The first and second communication numbers are plural,
A carbon dioxide capture device in which the inner pipe communication portion and the outer pipe communication portion are configured such that, at the first and second overlapping timings, the inner pipe positions and outer pipe positions in the overlapping inner pipe hole portion and outer pipe hole portion are aligned so as to circumnavigate the central axis at equal intervals. 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. The carbon dioxide recovery apparatus according to any one of claims 2 to 4,
the inner pipe communicating portion and the outer pipe communicating portion are configured so that the first overlap timing and the second overlap timing occur alternately. A 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,
A carbon dioxide capture device, wherein the maximum communication area of a communication part is equal to or greater than the maximum communication area of a 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.

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