Acid gas adsorption device

Abstract

Provided is an acid gas adsorption device capable of stably desorbing an acid gas from an acid gas adsorption material. An acid gas adsorption device according to an embodiment of the present invention is provided with a first adsorption unit and a second adsorption unit. The second adsorption unit is disposed on the downstream side of the first adsorption unit in the passing direction of the gas to be treated with an interval therebetween. The first adsorption part comprises a first flow path, and the second adsorption part comprises a second flow path. And a first separated gas flow path communicated with the first flow path and the second flow path is formed between the first adsorption part and the second adsorption part in the passing direction of the to-be-treated gas.

Description

Technical Field The invention relates to an acid gas adsorption device. Background Art In recent years, efforts have been made to separate and recover acidic gases contained in the atmosphere in order to reduce environmental load. The main acidic gases include carbon dioxide (hereinafter sometimes referred to as CO 2 As a representative example of the above efforts, the carbon dioxide capture, utilization and storage (CCUS) cycle is known. As a carbon dioxide adsorption device used in such carbon dioxide separation and recovery, a gas separation unit having a carbon dioxide adsorption part with a granular structure has been proposed (for example, see Patent Document 1). In such a gas separation unit, the carbon dioxide adsorbent material adsorbs CO at a predetermined adsorption temperature. 2 When heated to a desorption temperature exceeding the adsorption temperature, the CO adsorbed by the carbon dioxide adsorbent material 2 About the CO 2 , by supplying the desorbed gas to the carbon dioxide adsorption section and allowing it to pass, it is recovered together with the desorbed gas. However, in the gas separation unit described in Patent Document 1, since the carbon dioxide adsorption section has a granular structure, it is difficult to make the desorbed gas flow evenly in the entire carbon dioxide adsorption section, and since the flow distance of the desorbed gas is long, the temperature of the desorbed gas decreases toward the rear section. Therefore, sometimes a temperature distribution is generated in the carbon dioxide adsorption section due to the uneven flow rate of the desorbed gas in the carbon dioxide adsorption section and the decrease in the temperature of the desorbed gas. As a result, there is a problem that the carbon dioxide adsorption section is partially below the desorption temperature, and CO cannot be removed from the carbon dioxide adsorbent. 2 Fully disengaged. Prior art literature Patent Literature Patent Document 1: International Publication No. 2014 / 170184 Summary of the invention A main object of the present invention is to provide an acid gas adsorbing device capable of stably desorbing acid gas from an acid gas adsorbing material.

[0001] The acid gas adsorption device according to the embodiment of the present invention includes an acid gas adsorption unit through which a gas to be treated can pass in a predetermined direction. The acid gas adsorption unit includes a first adsorption unit and a second adsorption unit. The second adsorption unit is arranged at a distance from the first adsorption unit on the downstream side in the passing direction of the gas to be treated. The first adsorption unit includes a first flow path. The second adsorption unit includes a second flow path. A first desorption gas flow path communicating with the first flow path and the second flow path is formed between the first adsorption unit and the second adsorption unit in the passing direction of the gas to be treated.

[0002] In the acid gas adsorption device described in [1], the first adsorption section and the second adsorption section may each include: a honeycomb substrate having a plurality of cells extending from a first end surface to a second end surface; and an acid gas adsorption layer located in the cells and containing an acid gas adsorption material. The cells of the first adsorption section include the first flow path, and the cells of the second adsorption section include the second flow path.

[0003] In the acid gas adsorption device described in [1] or [2] above, the acid gas may be carbon dioxide.

[0004] The acid gas adsorption device described in any one of [1] to [3] above may further include a housing and a first opening and closing valve. The housing accommodates the acid gas adsorption unit. The first opening and closing valve is accommodated in the housing and can open and close the internal space of the housing. The first opening and closing valve is arranged on the upstream side of the first adsorption unit in the passing direction of the gas to be treated. When the first opening and closing valve is in a closed state, a second desorption gas flow path communicating with the first flow path may be formed between the first opening and closing valve and the first adsorption unit in the passing direction of the gas to be treated.

[0005] In the acid gas adsorption device described in [4] above, the housing may have: an inlet, an outlet, and a first opening. The inlet is located at one end of the housing in the direction in which the gas to be treated passes. The outlet is located at the other end of the housing in the direction in which the gas to be treated passes. The first opening communicates with the first desorbed gas flow path. The portion of the internal space of the housing in which the first opening and closing valve is arranged may be configured as a first opening and closing port that is opened and closed by the first opening and closing valve. The opening area of ​​the first opening and closing port may be larger than the opening area of ​​the first opening.

[0006] The acid gas adsorption device described in any one of [1] to [5] may further include a housing and a second opening and closing valve. The housing accommodates the acid gas adsorption unit. The second opening and closing valve is accommodated in the housing and can open and close the internal space of the housing. The second opening and closing valve is arranged on the downstream side of the second adsorption unit in the passing direction of the gas to be treated. When the second opening and closing valve is in a closed state, a third desorption gas flow path that communicates with the second flow path may be formed between the second adsorption unit and the second opening and closing valve in the passing direction of the gas to be treated.

[0007] In the acid gas adsorption device described in [6] above, the housing may have: an inlet, an outlet, and a first opening. The inlet is located at one end of the housing in the direction in which the gas to be treated passes. The outlet is located at the other end of the housing in the direction in which the gas to be treated passes. The first opening communicates with the first desorbed gas flow path. The portion of the internal space of the housing in which the second opening and closing valve is arranged may be configured as a second opening and closing port that is opened and closed by the second opening and closing valve. The opening area of ​​the second opening and closing port may be larger than the opening area of ​​the first opening.

[0008] In the acid gas adsorption device described in any one of [1] to [7] above, the first adsorption section may be divided into a plurality of parts in a direction orthogonal to a passing direction of the gas to be treated.

[0009] In the acid gas adsorption device described in any one of [1] to [8] above, the second adsorption section may be divided into a plurality of parts in a direction orthogonal to a passing direction of the gas to be treated. Effects of the Invention According to the embodiment of the present invention, it is possible to realize an acid gas adsorbing device capable of stably removing acid gas from an acid gas adsorbing material. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 This is a schematic configuration diagram of an acid gas adsorption device according to one embodiment of the present invention. Figure 2 This is a schematic configuration diagram of an acid gas adsorption device according to another embodiment of the present invention. Figure 3 yes Figure 2 A schematic three-dimensional diagram of one embodiment of a block in FIG. Figure 4 yes Figure 2 Central cross-section of the block in . Figure 5 yes Figure 2 A schematic diagram of another implementation of the block in FIG. Figure 6 This is a schematic configuration diagram of an acid gas adsorption device according to still another embodiment of the present invention. Figure 7 This is a schematic configuration diagram of an acid gas adsorption device according to still another embodiment of the present invention. Figure 8 This is a schematic configuration diagram of an acid gas adsorption device according to still another embodiment of the present invention. Fig. 9 This is a schematic configuration diagram of an acid gas adsorption device according to still another embodiment of the present invention. DETAILED DESCRIPTION Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings, but the present invention is not limited to these embodiments. In addition, in order to make the description clearer, the accompanying drawings sometimes schematically show the width, thickness, shape, etc. of each part compared with the embodiments, but this is only an example and does not limit the interpretation of the present invention. A. Overview of Acid Gas Adsorption Device Figure 1 This is a schematic configuration diagram of an acid gas adsorption device according to one embodiment of the present invention. The acid gas adsorption device 100 shown in the figure is provided with an acid gas adsorption section 10 through which the gas to be treated can pass in a predetermined direction. The acid gas adsorption section 10 is provided with a first adsorption section 1 and a second adsorption section 2. The second adsorption section 2 is arranged at a distance from the first adsorption section 1 on the downstream side in the passing direction of the gas to be treated. The first adsorption section 1 includes a first flow path 94a. The second adsorption section 2 includes a second flow path 94b. A first desorption gas flow path 11 communicating with the first flow path 94a and the second flow path 94b is formed between the first adsorption section 1 and the second adsorption section 2 in the passing direction of the gas to be treated. According to such a configuration, the first adsorption unit and the second adsorption unit are arranged at intervals from each other in the direction of passage of the gas to be treated, and a first desorption gas flow path is formed between them. The first desorption gas flow path communicates with the first flow path of the first adsorption unit and the second flow path of the second adsorption unit. Therefore, in the desorption process described later, the desorption gas can be supplied to the first flow path and the second flow path via the first desorption gas flow path (refer to Figure 1 ), or the desorption gas that has passed through the first flow path and the second flow path flows into the first desorption gas flow path (refer to Figure 7 As a result, the flow distance of the desorbed gas can be reduced, and the desorbed gas can flow evenly throughout the acid gas adsorption unit. Thus, the temperature distribution in the acid gas adsorption unit can be evenly maintained, so that the acid gas can be stably desorbed from the acid gas adsorbent. In one embodiment, the first adsorption unit 1 and the second adsorption unit 2 each include a honeycomb substrate 9 and an acid gas adsorption layer 5 (see Figure 3 and Figure 4The honeycomb substrate 9 has a plurality of cells 93 extending from the first end surface E1 to the second end surface E2 (see Figure 4 ). The acid gas adsorption layer 5 is located in the compartment 93 and contains an acid gas adsorption material. The compartment 93 of the first adsorption unit 1 includes a first flow path 94a. The compartment 93 of the second adsorption unit 2 includes a second flow path 94b. According to such a configuration, compared with the case where the acid gas adsorption unit has a granular structure, the desorbed gas can flow more uniformly throughout the acid gas adsorption unit, thereby being able to uniformly maintain the temperature distribution in the acid gas adsorption unit. In the acid gas adsorption unit 10 shown in the figure, the plurality of compartments 93 extend along the passing direction of the gas to be treated and are arranged in parallel in a direction orthogonal to the passing direction of the gas to be treated. Therefore, in the first adsorption unit 1, the plurality of first flow paths 94a are arranged in parallel in a direction orthogonal to the passing direction of the gas to be treated, and in the second adsorption unit 2, the plurality of second flow paths 94b of the second adsorption unit 2 are arranged in parallel in a direction orthogonal to the passing direction of the gas to be treated. In the example shown in the figure, the first desorption gas flow path 11 extends in a direction perpendicular to the passage direction of the gas to be treated, and communicates with all of the plurality of first flow paths 94 a and the plurality of second flow paths 94 b . In the passing direction of the gas to be treated, the size of the first adsorption portion 1 relative to the size of the second adsorption portion 2 is, for example, 0.5 or more, preferably 0.8 or more, and, for example, 1.5 or less, preferably 1.2 or less, and more preferably 1. The size of each of the first adsorption portion 1 and the second adsorption portion 2 in the passing direction of the gas to be treated is, for example, 0.25 m or more, preferably 0.30 m or more, and, for example, 1.0 m or less, preferably 0.5 m or less. If the size of the first adsorption part is within the above range, the length of the first flow path of the first adsorption part and the length of the second flow path of the second adsorption part 2 can be well balanced. Therefore, the temperature difference between the first adsorption part and the second adsorption part in the desorption process can be suppressed, so that the acid gas can be desorbed from the acid gas adsorbent more stably. The dimension of the first desorption gas flow path 11 in the passing direction of the gas to be treated is the interval between the first adsorption part 1 and the second adsorption part 2, and is from a direction orthogonal to the passing direction of the gas to be treated ( Figure 1 The width of the first desorption gas flow path 11 when observed in the depth direction of the paper. In the direction of passage of the gas to be treated, the size of the first desorption gas flow path 11 is, for example, 1 / 100 or more, preferably 1 / 20 or more, and for example, 1 / 5 or less, preferably 1 / 10 or less, relative to the size of the first adsorption part 1. The size of the first desorption gas flow path 11 in the direction of passage of the gas to be treated is, for example, 0.2 cm or more, preferably 0.5 cm or more, and for example, 5 cm or less, preferably 2 cm or less. If designed in this way, the resistance to penetration from the adsorption part becomes sufficiently large relative to the penetration resistance of the desorption gas flow path, so that the distribution of the desorption gas becomes uniform. Although the size of the desorption gas flow path is determined based on the resistance of the adsorption part, if the distribution of the desorption gas becomes uniform, the size of the desorption gas flow path can be appropriately changed according to the purpose of the effect. In addition, if the size of the first desorption gas flow path is within the above range, it is possible to suppress the retention of the gas to be treated in the first desorption gas flow path in the adsorption process described later, and the desorption gas can pass smoothly in the desorption process described later. In one embodiment, during passage of the desorbed gas, the pressure loss in the first adsorption unit 1 is greater than the pressure loss in the first desorbed gas flow path 11 , and the pressure loss in the second adsorption unit 2 is greater than the pressure loss in the first desorbed gas flow path 11 . The size of each of the first adsorption unit 1 and the second adsorption unit 2 in the direction perpendicular to the passing direction of the gas to be treated is not particularly limited, and is, for example, 1.5 m or more, preferably 2.0 m or more, and, for example, 4.0 m or less, preferably 3.0 m or less. In one embodiment, the acid gas adsorption device 100 further includes a housing 6. The housing 6 accommodates the acid gas adsorption unit 10 including the first adsorption unit 1, the second adsorption unit 2, and the first desorption gas flow path 11. In the example shown in the figure, the housing 6 has a cylindrical shape extending along the passing direction of the gas to be treated. One end of the housing 6 is configured as an inlet 64, and the other end of the housing 6 is configured as an outlet 65. In other words, the housing 6 has an inlet 64 and an outlet 65. The inlet 64 is located at one end of the housing 6 in the direction in which the gas to be treated passes. In the adsorption process described later, the gas to be treated passes through the inlet 64 and flows into the internal space of the housing 6. In addition, the outlet 65 is located at the other end of the housing 6 in the direction in which the gas to be treated passes. In the adsorption process described later, the treated gas having the acid gas concentration reduced by passing through the acid gas adsorption unit 10 passes through the outlet 65 and flows out of the housing 6. The opening area of ​​the inlet 64 and the opening area of ​​the outlet 65 may be the same as or different from each other. In the example shown in the figure, the opening area of ​​the inlet 64 and the opening area of ​​the outlet 65 are the same as each other. Typically, a first opening 61 communicating with the first desorption gas flow path 11 is formed on the side wall of the housing 6. In other words, the housing 6 also has the first opening 61. The direction in which the first opening 61 extends may be parallel to the direction in which the first desorption gas flow path 11 extends, or may be inclined so as to intersect the direction in which the first desorption gas flow path 11 extends. In the example shown in the figure, the direction in which the first opening 61 extends is parallel to the direction in which the first desorption gas flow path 11 extends. In the example shown in the figure, the first valve 16 is provided in the first opening 61 , and a desorption gas supply unit (not shown) capable of supplying the desorption gas to the first desorption gas flow path 11 is connected via the first valve 16 . In one embodiment, the acid gas adsorption device 100 further includes a first opening and closing valve 7. The first opening and closing valve 7 is housed in the housing 6, and can open and close the internal space of the housing 6. The first opening and closing valve 7 is arranged on the upstream side of the first adsorption unit 1 in the passing direction of the gas to be treated. As the first opening and closing valve 7, for example, a ball valve, a gate valve, and a butterfly valve can be cited. In the example shown in the figure, the first opening and closing valve 7 is a butterfly valve. When the first opening and closing valve 7 is in a closed state, a second desorption gas flow path 12 communicating with the first flow path 94a is formed between the first opening and closing valve 7 and the first adsorption unit 1 in the passing direction of the gas to be treated. According to such a structure, the desorption gas can flow smoothly and evenly in the entire first adsorption unit through the first desorption gas flow path and the second desorption gas flow path, so that the acid gas can be stably desorbed from the acid gas adsorption material contained in the first adsorption unit. In one embodiment, the portion of the internal space of the housing 6 in which the first opening and closing valve 7 is arranged is configured as a first opening and closing port 70 opened and closed by the first opening and closing valve 7. Typically, the opening area of ​​the first opening and closing port 70 is larger than the opening area of ​​the first opening 61. The opening area of ​​the first opening and closing port 70 is, for example, 8 to 12 times the opening area of ​​the first opening 61. If the opening areas of the first opening and closing port and the first opening are in such a relationship, the pressure loss in the adsorption process can be kept low, and the distribution of the desorbed gas can be kept uniform during the desorbed process, so that the acid gas can be fully desorbed. The opening area of ​​the first opening and closing port 70 may be the same as or different from the opening area of ​​the inlet 64. In the example shown in the figure, the opening area of ​​the first opening and closing port 70 is larger than the opening area of ​​the inlet 64. Thus, the pressure loss in the adsorption process can be kept low, and the distribution of the desorbed gas can be kept uniform in the desorbed process, so that the acid gas can be fully desorbed. It should be noted that the opening area of ​​the first opening and closing port 70 is: the area of ​​the portion surrounded by the side wall of the outer shell 6 in the cross section obtained by cutting the portion where the first opening and closing valve 7 in the outer shell 6 is located in a direction perpendicular to the axial direction of the outer shell 6 (the direction of passage of the gas to be treated). In the example shown in the figure, the second desorption gas flow path 12 is located on the opposite side of the first desorption gas flow path 11 with respect to the first adsorption unit 1. The second desorption gas flow path 12 extends in a direction perpendicular to the passing direction of the gas to be treated and communicates with all of the plurality of first flow paths 94a. The size of the second desorption gas flow path 12 in the passing direction of the gas to be treated is the interval between the first adsorption unit 1 and the first on-off valve 7 in the closed state, and is from the direction orthogonal to the passing direction of the gas to be treated ( Figure 1 The width of the second desorption gas flow path 12 when observed in the depth direction of the paper. In the direction in which the gas to be treated passes, the maximum size of the second desorption gas flow path 12 is, for example, 1 / 100 or more, preferably 1 / 20 or more, and for example, 1 / 5 or less, preferably 1 / 10 or less, relative to the size of the first adsorption unit 1. The maximum size of the second desorption gas flow path 12 in the direction in which the gas to be treated passes is, for example, 0.2 cm or more, preferably 0.5 cm or more, and for example, 5 cm or less, preferably 2 cm or less. If the maximum size of the second desorption gas flow path is within the above range, the desorption gas can pass smoothly in the desorption process described later. In one embodiment, during the passage of the desorbed gas, the pressure loss in the first adsorption unit 1 is greater than the pressure loss in the second desorbed gas flow path 12 . In one embodiment, a second opening 62 communicating with the second degassing gas flow path 12 is formed on the side wall of the housing 6. In other words, the housing 6 further has the second opening 62. The direction in which the second opening 62 extends may be parallel to the direction in which the second degassing gas flow path 12 extends (see Figure 1 ), or may be inclined in a manner intersecting with the direction in which the second desorption gas flow path 12 extends (see Figure 8 ). In the example shown in the figure, the second valve 17 is provided at the second opening 62 , and a recovery unit (not shown) for recovering desorbed gas including acid gas desorbed from the acid gas adsorbent is connected via the second valve 17 . The opening area of ​​the second opening 62 may be the same as or different from the opening area of ​​the first opening 61. In the example shown, the opening area of ​​the second opening 62 is the same as the opening area of ​​the first opening 61. Typically, the opening area of ​​the second opening 62 is smaller than the opening area of ​​the first opening and closing port 70. like Fig. 9As shown, in one embodiment, the acid gas adsorption device 100 may have a pipe 68 instead of the second opening 62. The pipe 68 is connected to the second desorption gas flow path 12. In the example shown in the figure, the pipe 68 integrally includes: a first portion extending along the passage direction of the gas to be treated, and a second portion extending in a direction intersecting (representatively orthogonal) with the passage direction of the gas to be treated. One end of the first portion is connected to the second desorption gas flow path 12. The second portion extends continuously from the other end of the first portion. Typically, a second valve 17 is provided at the free end of the second portion. The pipe 68 may be integrally provided in the housing 6, or may be installed in the housing 6 as a separate body. like Figure 1 As shown, in one embodiment, the acid gas adsorption device 100 further includes a second opening and closing valve 8. The second opening and closing valve 8 is housed in the housing 6, and can open and close the internal space of the housing 6. The second opening and closing valve 8 is arranged on the downstream side of the second adsorption section 2 in the passing direction of the gas to be treated. As the second opening and closing valve 8, for example, a ball valve, a gate valve, and a butterfly valve can be cited. In the example shown in the figure, the second opening and closing valve 8 is a butterfly valve. When the second opening and closing valve 8 is in a closed state, a third desorption gas flow path 13 communicating with the second flow path 94b is formed between the second adsorption section 2 and the second opening and closing valve 8 in the passing direction of the gas to be treated. According to such a structure, the desorption gas can flow smoothly and evenly in the entire second adsorption section through the first desorption gas flow path and the third desorption gas flow path, so that the acid gas can be stably desorbed from the acid gas adsorption material contained in the second adsorption section. In one embodiment, the portion of the internal space of the housing 6 where the second opening and closing valve 8 is disposed is configured as a second opening and closing port 80 that is opened and closed by the second opening and closing valve 8. Typically, the opening area of ​​the second opening and closing port 80 is larger than the opening area of ​​each of the first opening 61 and the second opening 62. The opening area of ​​the second opening and closing port 80 is, for example, 8 to 12 times the opening area of ​​the first opening 61. If the opening areas of the second opening and closing port and the first opening are in such a relationship, the pressure loss in the adsorption process can be kept low, and the distribution of the desorbed gas can be kept uniform during the desorbed process. The opening area of ​​the second opening and closing opening 80 may be the same as or different from the opening area of ​​the first opening and closing opening 70. In the example shown in the figure, the opening area of ​​the second opening and closing opening 80 is the same as the opening area of ​​the first opening and closing opening 70. In addition, the opening area of ​​the second opening and closing port 80 may be the same as or different from the opening area of ​​the outflow port 65. In the example shown in the figure, the opening area of ​​the second opening and closing port 80 is larger than the opening area of ​​the outflow port 65. Thus, the pressure loss in the adsorption process can be kept low, and the distribution of the desorbed gas can be kept uniform in the desorbed process. It should be noted that the opening area of ​​the second opening and closing port 80 is: the area of ​​the portion surrounded by the side wall of the outer shell 6 in the cross section obtained by cutting the portion where the second opening and closing valve 8 in the outer shell 6 is located in a direction perpendicular to the axial direction of the outer shell 6 (the direction of passage of the gas to be treated). In the example shown in the figure, the third desorption gas flow path 13 is located on the opposite side of the first desorption gas flow path 11 relative to the second adsorption unit 2. The third desorption gas flow path 13 extends in a direction perpendicular to the passage direction of the treated gas and communicates with all of the plurality of second flow paths 94b. The dimension of the third desorption gas flow path 13 in the passing direction of the gas to be treated is the interval between the second adsorption unit 2 and the second on-off valve 8 in the closed state, and is from a direction orthogonal to the passing direction of the gas to be treated ( Figure 1 The width of the third desorption gas flow path 13 when observed in the depth direction of the paper. The maximum dimension range of the third degassing gas flow path 13 in the passing direction of the treated gas is the same as the maximum dimension range of the second degassing gas flow path 12. If the maximum dimension of the third degassing gas flow path 13 is within the above range, the degassing gas can pass smoothly in the degassing step described later. In one embodiment, during passage of the desorbed gas, the pressure loss in the second adsorption unit 2 is greater than the pressure loss in the third desorbed gas flow path 13 . In one embodiment, a third opening 63 communicating with the third desorption gas flow path 13 is formed on the side wall of the housing 6. In other words, the housing 6 further includes the third opening 63. The direction in which the third opening 63 extends may be parallel to the direction in which the third desorption gas flow path 13 extends, or may be inclined so as to intersect with the direction in which the third desorption gas flow path 13 extends. In the example shown in the figure, the third valve 18 is provided in the third opening 63 , and a recovery unit (not shown) for recovering desorbed gas including acid gas desorbed from the acid gas adsorbent is connected via the third valve 18 . The opening area of ​​the third opening 63 may be the same as or different from the opening area of ​​the second opening 62. In the example shown in the figure, the opening area of ​​the first opening 61, the opening area of ​​the second opening 62, and the opening area of ​​the third opening 63 are the same. Typically, the opening area of ​​the third opening 63 is smaller than the opening area of ​​the second opening and closing port 80. In addition, the acid gas adsorbing device 100 may include a pipe communicating with the third desorbed gas flow path 13 instead of the third opening 63 . In one embodiment, if Figure 2As shown, the first adsorption part 1 is divided into a plurality of first blocks 1a in a direction orthogonal to the passing direction of the gas to be treated. In other words, the first adsorption part 1 is composed of a plurality of first blocks 1a arranged side by side in a direction orthogonal to the passing direction of the gas to be treated. Thus, a relatively small first block can be manufactured to constitute the first adsorption part. Therefore, compared with the case where the first adsorption part is manufactured together, the first adsorption part can be manufactured easily. The adjacent first blocks 1a of the plurality of first blocks 1a may have a gap therebetween, or may contact each other in a direction perpendicular to the passing direction of the gas to be processed. In addition, although not shown, a plate-like member may be provided between the adjacent first blocks 1a. In the example shown in the figure, the first adsorption unit 1 is divided into four in the vertical direction of the paper (the direction perpendicular to the passing direction of the gas to be treated). The first adsorption unit 1 may be divided into a plurality of parts in the depth direction of the paper (the direction perpendicular to the passing direction of the gas to be treated). The number of the first blocks 1 a is, for example, 2 or more, preferably 3 or more, more preferably 5 or more, and is, for example, 300 or less. In one embodiment, the second adsorption unit 2 is divided into a plurality of second blocks 2a in a direction perpendicular to the passing direction of the gas to be treated. In other words, the second adsorption unit 2 is composed of a plurality of second blocks 2a arranged side by side in a direction perpendicular to the passing direction of the gas to be treated. Thus, a relatively small second block can be manufactured to constitute the second adsorption unit. Therefore, compared with the case where the second adsorption unit is manufactured all at once, the second adsorption unit can be manufactured easily. The adjacent second blocks 2a in the plurality of second blocks 2a may form a gap therebetween, or may contact each other in a direction orthogonal to the passing direction of the gas to be processed. In addition, although not shown, a plate-like member may be provided between the adjacent second blocks 2a. In the example shown in the figure, the second adsorption unit 2 is divided into four in the vertical direction of the paper (the direction perpendicular to the passing direction of the gas to be treated). The second adsorption unit 2 may be divided into a plurality of parts in the depth direction of the paper (the direction perpendicular to the passing direction of the gas to be treated). The number of the second blocks 2 a is, for example, 2 or more, preferably 3 or more, more preferably 5 or more, and, for example, 300 or less. Hereinafter, the specific structure of the acid gas adsorption unit (the first adsorption unit and the second adsorption unit) will be described. B. Acid gas adsorption unit Examples of the acidic gas adsorbed by the acidic gas adsorption unit 10 include carbon dioxide (CO 2), hydrogen sulfide, sulfur dioxide, nitrogen dioxide, dimethyl sulfide (DMS), hydrogen chloride, etc. In one embodiment, the acidic gas is carbon dioxide (CO 2 ), the fluid contains CO 2 Gas. Contains CO 2 In addition to CO 2 In addition, it also contains nitrogen. 2 Gas, typically air (atmosphere). CO2-containing gas before being supplied to the acid gas adsorption device 2 CO in gas 2 The concentration is, for example, 100 ppm (volume basis) or more and 2 volume % or less. In the following, the acid gas is carbon dioxide (CO 2 ) is described in detail. As described above, the acid gas adsorption unit 10 includes the first adsorption unit 1 and the second adsorption unit 2. The first adsorption unit 1 and the second adsorption unit 2 have the same structure. Figure 1 The first adsorption part 1 (integrally formed) and Figure 2 The first block 1a shown has the same structure except for the different size. Figure 2 The structure of the first block 1a shown will be described in detail. In one embodiment, if Figure 3 and Figure 4 As shown, the first block 1 a includes the honeycomb substrate 9 and the acid gas adsorption layer 5 as described above. B-1. Honeycomb substrate Typically, the honeycomb base material 9 includes partition walls 92 defining a plurality of cells 93 . The cell 93 extends from the first end face E1 (inflow end face) to the second end face E2 (outflow end face) of the honeycomb substrate 9 in the longitudinal direction (axial direction) of the honeycomb substrate 9 (see Figure 4 ). The cell 93 has any appropriate shape in the cross section of the honeycomb substrate 9 in a direction perpendicular to the longitudinal direction. Examples of the cross-sectional shape of the cell include: a triangle, a quadrilateral, a pentagon, a polygon larger than a hexagon, a circle, and an ellipse. The cross-sectional shape and size of the cell may be all the same or at least partially different. Among the cross-sectional shapes of such cells, preferably a hexagon or a quadrilateral can be mentioned, and more preferably a square, a rectangle, or a hexagon can be mentioned. The cell density in the cross section of the honeycomb substrate in a direction perpendicular to the longitudinal direction (i.e., the number of cells 93 per unit area) can be appropriately set according to the purpose. For example, the cell density can be 4 cells / cm 2 ~320 compartments / cm 2When the cell density is within such a range, the strength and effective GSA (geometric surface area) of the honeycomb substrate can be sufficiently ensured. The honeycomb substrate 9 has any appropriate shape (overall shape). Examples of the shape of the honeycomb substrate include a cylindrical shape with a circular bottom surface, an elliptical cylindrical shape with an elliptical bottom surface, a prism shape with a polygonal bottom surface, and a column shape with an irregular bottom surface. The honeycomb substrate 9 shown in the figure has a prism shape. The outer diameter and length of the honeycomb substrate can be appropriately set according to the purpose. Although not shown in the figure, the honeycomb substrate may have a hollow area in the center of the cross section in a direction perpendicular to the longitudinal direction. Typically, the honeycomb substrate 9 includes an outer wall 91 and partition walls 92 located inside the outer wall 91. In the example shown in the figure, the outer wall 91 and the partition walls 92 are formed integrally. The outer wall 91 and the partition walls 92 may be separate bodies. In the example shown in the figure, the outer wall 91 has a square tube shape. The thickness of the outer wall 91 can be set arbitrarily and appropriately. The thickness of the outer wall 91 is, for example, 0.1 mm to 10 mm. The partition wall 92 defines a plurality of compartments 93. More specifically, the partition wall 92 includes a first partition wall 92a and a second partition wall 92b that are orthogonal to each other, and the first partition wall 92a and the second partition wall 92b define a plurality of compartments 93. The cross-sectional shape of the compartment 93 is substantially quadrilateral. It should be noted that the configuration of the partition wall is not limited to the above-mentioned partition wall 92. The partition wall includes: a first partition wall extending in a radial direction, and a second partition wall extending in a circumferential direction, which can define a plurality of compartments. The thickness of the partition wall 92 can be appropriately set according to the purpose of the acid gas adsorption device. Typically, the thickness of the partition wall 92 is thinner than the thickness of the outer wall 91. The thickness of the partition wall 92 is, for example, 0.03 mm to 0.6 mm. The thickness of the partition wall is measured by, for example, cross-sectional observation based on SEM (scanning electron microscope). If the thickness of the partition wall is within such a range, the mechanical strength of the honeycomb substrate can be sufficient, and the opening area (the total area of ​​the cells in the cross section) can be sufficient. The porosity of the partition wall 92 can be appropriately set according to the purpose. The porosity of the partition wall 92 is, for example, 15% or more, preferably 20% or more, and, for example, 70% or less, preferably 45% or less. The porosity can be measured by, for example, mercury penetration. The bulk density of the partition walls 92 can be appropriately set according to the purpose. For example, the bulk density is 0.10 g / cm 3 Above, preferably 0.20 g / cm 3 Above, for example, 0.60 g / cm 3 Below, preferably 0.50g / cm 3 Hereinafter, the bulk density can be measured by, for example, mercury intrusion porosimetry. As a material constituting the partition wall 92, ceramics can be cited representatively. As ceramics, for example, silicon carbide, silicon-silicon carbide composite materials, cordierite, mullite, alumina, silicon nitride, spinel, silicon carbide-cordierite composite materials, lithium aluminum silicate and aluminum titanate can be cited. The materials constituting the partition wall can be used alone or in combination. Among the materials constituting the partition wall, cordierite, alumina, mullite, silicon carbide, silicon-silicon carbide composite materials and silicon nitride can be cited preferably, and silicon carbide and silicon-silicon carbide composite materials can be cited more preferably. Typically, such a honeycomb substrate 9 is produced by the following method. First, a binder and water or an organic solvent are added to the material powder containing the above-mentioned ceramic powder as needed, and the obtained mixture is kneaded to form a blank, and the blank is molded (typically extrusion molded) into a desired shape, and then dried and fired as needed to produce the honeycomb substrate 9. In the case of firing, the firing is performed at, for example, 1200° C. to 1500° C. The firing time is, for example, 1 hour or more and 20 hours or less. B-2. Acidic gas adsorption layer (carbon dioxide adsorption layer) In one embodiment, the acid gas adsorption layer 5 is formed on the surface of the partition wall 92 in the cell 93. In the honeycomb substrate 9, a flow path 94 (a first flow path 94a or a second flow path 94b) is formed in a portion (representatively, a central portion) of the cross section of the cell 93 where the acid gas adsorption layer 5 is not formed. The acid gas adsorption layer 5 may be formed on the entire inner surface of the partition wall 92 (i.e., in a manner that surrounds the flow path 94) as shown in the example of the figure, or may be formed on a portion of the surface of the partition wall. If the acid gas adsorption layer 5 is formed on the entire inner surface of the partition wall 92, the acid gas (representatively, CO 2 ) can be increased. 2 ) adsorption efficiency. The flow path 94 extends from the first end face E1 (inflow end face) to the second end face E2 (outflow end face) in the same manner as the compartment 93. The cross-sectional shape of the flow path 94 may be the same as that of the compartment 93, preferably a hexagon or a quadrilateral, more preferably a square, a rectangle or a hexagon. The cross-sectional shape and size of the flow path 94 may be the same in all or may be at least partially different. Typically, in an adsorption step described later, a gas to be treated containing an acidic gas is supplied to the cell 93 (more specifically, the flow path 94 ), and in a desorption step described later, the desorbed gas flows through the cell 93 . The acid gas adsorption layer 5 contains an acid gas adsorption material corresponding to the acid gas to be adsorbed. The acid gas is CO 2 In this case, the acid gas adsorbent is a carbon dioxide adsorbent. As carbon dioxide adsorbent materials, 2Any suitable compound that adsorbs and desorbs. Examples of carbon dioxide adsorbents include: nitrogen-containing compounds described below; alkaline compounds such as sodium hydroxide and potassium hydroxide; carbonates such as calcium carbonate and potassium carbonate; bicarbonates such as calcium hydrogen carbonate and potassium hydrogen carbonate; organometallic structures (MOFs) such as MOF-74, MOF-200, and MOF-210; zeolites; activated carbon; nitrogen-doped carbon; ionic liquids, etc. Carbon dioxide adsorbents can be used alone or in combination. Among the carbon dioxide adsorbents, nitrogen-containing compounds and ionic liquids are preferred. More specifically, the nitrogen-containing compounds include: primary amines such as monoethanolamine and polyethyleneamine; secondary amines such as diethanolamine, cyclic amines, and N-(3-aminopropyl)diethanolamine; tertiary amines such as methyldiethylamine and triethanolamine; ethyleneamine compounds such as tetraethylenepentamine; aminosilane coupling agents such as aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, N-(2-aminoethyl)-3-aminopropyl-trimethoxysilane, and polyethyleneimine-trimethoxysilane; imine compounds such as ethyleneimine, linear polyethyleneimine, and branched polyethyleneimine having primary to tertiary amino groups; piperazine compounds such as 1-(2-hydroxyethyl)piperazine; amide compounds such as polyamideamine; polyethyleneamine; and organic / inorganic compounds having an amino group as a substituent. Among the nitrogen-containing compounds, preferred examples include methyldiethylamine, monoethanolamine, cyclic amines, diethanolamine, tetraethylenepentamine, ethyleneimine, linear polyethyleneimine, branched polyethyleneimine, and organic / inorganic compounds having an amino group as a substituent. Ionic liquids are liquid "salts" composed only of ions (anions and cations), and are in a liquid state at normal temperature and pressure (23°C, 0.1 MPa). Examples of cations of ionic liquids include: ammonium ions such as imidazolium salts and pyridinium salts, phosphonium ions, sulfonium salts, inorganic ions, and the like. Examples of anions of ionic liquids include: halogen ions such as bromide ions and trifluoromethanesulfonates; boron ions such as tetraphenylborate; phosphorus ions such as hexafluorophosphate; and sulfur ions such as alkylsulfonates. Among ionic liquids, a combination of imidazolium salts as cations and trifluoromethanesulfonates as anions is preferred. The ionic liquid is more preferably used in combination with a carbon dioxide adsorbent material other than the ionic liquid (hereinafter referred to as other carbon dioxide adsorbent material). In this case, the ionic liquid is coated with the other carbon dioxide adsorbent material (eg, a nitrogen-containing compound). Therefore, the performance of the carbon dioxide adsorbent material can be improved and the life can be extended. The content ratio of the ionic liquid is, for example, 0.000001 parts by mass or more, preferably 0.00001 parts by mass or more, and for example, 0.1 parts by mass or less, preferably 0.05 parts by mass or less, relative to 1 part by mass of other carbon dioxide adsorbents. If the content ratio of the ionic liquid is within the above range, the performance improvement and long life of the carbon dioxide adsorbent can be stably achieved. In one embodiment, the acid gas adsorbent layer 5 further includes a porous carrier in addition to the above-mentioned acid gas adsorbent. In this case, the acid gas adsorbent is typically supported on the porous carrier to face the flow path. If the acid gas adsorbent layer includes a porous carrier, it is possible to suppress the acid gas adsorbent from falling off from the acid gas adsorbent layer during the adsorption process and / or the desorption process. The porous carrier can form mesopores in the acidic gas adsorbent layer. Examples of porous carriers include: organometallic structures (MOFs) such as MOF-74, MOF-200, and MOF-210; activated carbon; nitrogen-doped carbon; mesoporous silica; mesoporous alumina; zeolite; carbon nanotubes; fluorinated resins such as polyvinylidene fluoride (PVDF), preferably: organometallic structures (MOFs), activated carbon, PVDF, zeolite, mesoporous silica, and mesoporous alumina. The porous carrier can be used alone or in combination. The porous carrier preferably uses a material different from the acidic gas adsorbent. The BET specific surface area of ​​the porous carrier is, for example, 50 m 2 / g or more, preferably 500m 2 If the surface area of ​​the porous carrier is greater than the above lower limit, the acid gas adsorbent can be stably supported, thereby improving the adsorption efficiency of the acid gas. The upper limit of the BET specific surface area of ​​the porous carrier is typically 2000 m 2 / g or less. When the acid gas adsorption material layer contains the acid gas adsorption material and the porous carrier, the total content ratio of the acid gas adsorption material and the porous carrier in the acid gas adsorption material layer is, for example, 30 mass% or more, preferably 50 mass% or more, and, for example, 100 mass% or less, preferably 99 mass% or less. The content ratio of the acidic gas adsorbent in the acidic gas adsorbent layer is, for example, 30% by mass or more, preferably 50% by mass or more, and, for example, 99% by mass or less. The content ratio of the porous carrier is, for example, 0.01 parts by mass or more, preferably 0.3 parts by mass or more, and, for example, 0.7 parts by mass or less, preferably 0.5 parts by mass or less, relative to 1 part by mass of the acidic gas adsorbent. If the content ratio of the porous carrier is within the above range, the acidic gas adsorbent can be supported more stably. In addition, the acid gas adsorbent layer may be composed only of the acid gas adsorbent. In this case, the acid gas adsorbent is directly supported on the partition wall 92 and faces the flow path. When the acid gas adsorbent layer is composed only of the acid gas adsorbent, the content of the acid gas adsorbent in the acid gas adsorbent layer is typically 95.0 mass % or more and 100 mass % or less. If the content of the acid gas adsorbent is within the above range, it is possible to stably ensure excellent acid gas adsorption efficiency. Typically, such an acidic gas adsorbent layer is produced by the following method. The above-mentioned acidic gas adsorbent is dissolved in a solvent to prepare a solution of the acidic gas adsorbent. In addition, the above-mentioned porous carrier is added to the solvent as needed. There is no particular restriction on the order of adding the acidic gas adsorbent and the porous carrier. Thereafter, the solution of the acidic gas adsorbent is applied to a substrate (specifically, a partition wall), and then the coating is dried and sintered as needed to form an acidic gas adsorbent layer. In addition, the configuration of the acidic gas adsorption unit (the first adsorption unit and the second adsorption unit) is not limited to the above configuration. In another embodiment, if Figure 5 As shown, the first block 1 a includes a plurality of adsorption material layers 71 . The plurality of adsorbent layers 71 are stacked with a gap in the thickness direction thereof. A flow path 94 (a first flow path 94a or a second flow path 94b) is formed between adjacent adsorbent layers 71 among the plurality of adsorbent layers 71. In the example shown in the figure, five adsorbent layers 71 are arranged in parallel, but the number of adsorbent layers 71 is not limited thereto. The number of adsorbent layers 71 is, for example, 5 or more, preferably 10 or more, and more preferably 20 or more. The gap between adjacent adsorbent layers 71 among the plurality of adsorbent layers 71 is, for example, 0.5 cm or more and 1.5 cm or less. Each of the plurality of adsorbent layers 71 includes a flexible fiber member 73 and a plurality of granular adsorbents 72 . The flexible fiber component 73 allows the passage of gas and restricts the passage of the granular adsorbent material. Typically, the flexible fiber component 73 is formed into a hollow shape (bag shape) capable of accommodating a plurality of granular adsorbent materials 72. The flexible fiber component 73 may be a fabric or a non-woven fabric. Examples of the material of the flexible fiber component 73 include organic fibers and natural fibers, preferably polyethylene terephthalate fibers, polyethylene fibers, and cellulose fibers. The thickness of the flexible fiber component 73 is, for example, not less than 25 μm and not more than 500 μm. A plurality of granular adsorbent materials 72 are filled inside a flexible fiber member 73 having a hollow shape (bag shape). The granular adsorbent material 72 functions as an acid gas adsorbent, and typically functions as a carbon dioxide adsorbent. As the material of the granular adsorbent 72, for example, a material modified with the above-mentioned acid gas adsorbent can be cited, preferably cellulose modified with the above-mentioned acid gas adsorbent can be cited, and more preferably nanofibrillated cellulose modified with the above-mentioned acid gas adsorbent can be cited. The average primary particle size of the granular adsorbent 72 is, for example, not less than 60 μm and not more than 1200 μm. The filling ratio of the granular adsorbent 72 in the adsorbent layer 71 can adopt any appropriate value. The acid gas adsorption unit of the illustrated example further includes a plurality of spacers 74. The spacers 74 are sandwiched between the adjacent adsorption material layers 71 among the plurality of adsorption material layers 71. Thus, the spacing between the adjacent adsorption material layers can be stably ensured. In one embodiment, the plurality of adsorption material layers 71 and the plurality of spacers 74 are arranged such that: from a direction orthogonal to the thickness direction of the adsorption material layer 71 ( Figure 1 When viewed in the depth direction of the paper, it becomes a roughly Z shape. As such an acid gas adsorption unit, for example, there can be mentioned a gas separation unit described in International Publication No. 2014 / 170184, the entire contents of which are incorporated herein by reference. Even if the first adsorption part (first block 1a) and / or the second adsorption part (second block 2a) have Figure 5 In the configuration shown, if a first desorption gas flow path is formed between the first adsorption unit and the second adsorption unit, the flow distance of the desorption gas can be reduced, so that the desorption gas can flow evenly in the entire acid gas adsorption unit, and the temperature distribution in the acid gas adsorption unit can be evenly maintained. That is, the same effect as above can be exerted. C. Acid Gas Recovery Method Next, refer to Figure 1 , a method for recovering acid gas using an acid gas adsorption device according to one embodiment of the present invention is described. Typically, the method for recovering acid gas includes an adsorption step and a desorption step in sequence. In one embodiment, in the adsorption process, the first on-off valve 7 and the second on-off valve 8 are set to an open state, and the gas to be treated containing the acid gas is supplied to the acid gas adsorption unit 1 adjusted to a predetermined adsorption temperature through the inlet 64 of the housing 6. At this time, the gas to be treated containing the acid gas passes through the first flow path 94a of the first adsorption unit 1 and the second flow path 94b of the second adsorption unit 2 in sequence. As a result, the acid gas adsorbent is discharged from the acid gas containing the acid gas (typically CO 2) to adsorb acidic gases in the fluid. The temperature of the acid gas adsorption unit in the adsorption process (adsorption temperature) is, for example, 0° C. or more, preferably 10° C. or more, and, for example, 50° C. or less, preferably 40° C. or less. In one embodiment, the adsorption temperature is the same as the outside air temperature. The implementation time of the adsorption process (adsorption time) is, for example, 15 minutes or more, preferably 30 minutes or more, and, for example, 3 hours or less, preferably 2 hours or less. When the adsorption temperature and / or the adsorption time are within the above ranges, the acid gas adsorbent can efficiently adsorb the acid gas. The acid gas adsorption rate in the adsorption process (=100-(acid gas concentration in the fluid that has passed through the acid gas adsorption section / acid gas concentration in the fluid before being supplied to the acid gas adsorption section×100)) is, for example, 60% or more, preferably 75% or more, more preferably 80% or more, and, for example, 90% or less. Next, in the desorption process, typically, the first on-off valve 7 and the second on-off valve 8 are set to a closed state, and the acid gas adsorption unit 10 (the first adsorption unit 1 and the second adsorption unit 2) is heated to a desorption temperature higher than the adsorption temperature. More specifically, after the first adsorption unit 1 and the second adsorption unit 2 are heated to the desorption temperature, they are maintained at the desorption temperature for a predetermined desorption time. As a result, the acid gas adsorbed by the acid gas adsorbent in the adsorption process is desorbed from the acid gas adsorbent. At this time, the desorption gas is supplied to the first desorption gas flow path 11 through the first opening 61 of the housing 6. The desorption gas supplied to the first desorption gas flow path 11 flows into the first flow path 94a of the first adsorption unit 1 or the second flow path 94b of the second adsorption unit 2. The acid gas desorbed from the acid gas adsorbent of the first adsorption unit 1 flows out to the second desorption gas flow path 12 together with the desorption gas passing through the first flow path 94a, and is recovered through the second opening 62 of the housing 6. The acid gas desorbed from the acid gas adsorbent of the second adsorption unit 2 flows out to the third desorbed gas flow path 13 together with the desorbed gas passing through the second flow path 94b, and is recovered through the third opening 63 of the housing 6. The gas recovered in the desorption process may be referred to as recovered gas. As the desorbed gas, preferably, there can be mentioned the recovered gas which has been previously recovered by the acid gas adsorption device. By using the recovered gas as the desorbed gas, the acid gas concentration in the recovered gas can be increased. The temperature of the acid gas adsorption unit in the desorption process (desorption temperature) is, for example, 70° C. or more, preferably 80° C. or more, and, for example, 200° C. or less, preferably 110° C. or less. The implementation time of the desorption process (desorption time during which the acid gas adsorption unit is maintained at the desorption temperature) is, for example, 1 minute or more, preferably 5 minutes or more, and, for example, 1 hour or less, preferably 30 minutes or less. If the desorption temperature and / or the desorption time are within the above ranges, the acid gas can be sufficiently desorbed from the acid gas adsorbent. In addition, in the desorption step, for example, the desorption gas and a decompression pump may be used in combination to suck the recovered gas. By the above operation, in the desorption step, the desorption gas can be uniformly flowed throughout the first adsorption section and the second adsorption section, and the acid gas can be efficiently recovered. The adsorption step and the desorption step are preferably repeated in sequence. D. Modification of the Acid Gas Adsorption Device like Figure 6 As shown, the acid gas adsorption device 100 includes an nth adsorption unit 3 in addition to the first adsorption unit 1 and the second adsorption unit 2. n is, for example, greater than or equal to 3 and less than or equal to 20. The nth adsorption unit 3 is disposed between the second adsorption unit 2 and the second on-off valve 8. When there are a plurality of nth adsorption units 3, they are sequentially arranged on the downstream side of the second adsorption unit 2 in the passing direction of the gas to be treated. A desorbed gas flow path may be formed between adjacent nth adsorption units 3 among the plurality of nth adsorption units 3 and between the nth adsorption unit 3 located at the most downstream and the second on-off valve 8 in a closed state. The nth adsorption unit 3 has the same structure as the first adsorption unit, and therefore, a detailed description thereof is omitted. In the example shown in the figure, the acid gas adsorption device 100 includes a third adsorption unit 31 and a fourth adsorption unit 32 in addition to the first adsorption unit 1 and the second adsorption unit 2. The third adsorption unit 31 is arranged at a distance from the second adsorption unit 2 on the downstream side in the passing direction of the gas to be treated. In the present embodiment, a third desorption gas flow path 13 is formed between the second adsorption unit 2 and the third adsorption unit 31 in the passing direction of the gas to be treated. The fourth adsorption portion 32 is arranged at a distance from the third adsorption portion 31 on the downstream side in the passing direction of the gas to be treated. In the present embodiment, a fourth desorption gas flow path 14 is formed between the third adsorption portion 31 and the fourth adsorption portion 32 in the passing direction of the gas to be treated. In addition, a fourth opening 66 communicating with the fourth desorption gas flow path 14 is formed on the side wall of the housing 6. In other words, the housing 6 further has a fourth opening 66. The fourth opening 66 is described in the same manner as the first opening 61 described above. In the example shown in the figure, the fourth opening 66 is provided with a fourth valve 19, and a desorption gas supply unit (not shown) capable of supplying desorption gas is connected via the fourth valve 19. In the above desorption process, the desorption gas is supplied to the fourth desorption gas flow path 14 similarly to the first desorption gas flow path 11. In the example shown in the figure, a fifth desorbed gas flow path 15 is formed between the fourth adsorption unit 32 and the second on-off valve 8 in the closed state. In addition, a fifth opening 67 communicating with the fifth desorbed gas flow path 15 is formed on the side wall of the housing 6. In other words, the housing 6 also has a fifth opening 67. The fifth opening 67 is described in the same manner as the third opening 63 described above. It should be noted that the acid gas adsorption device 100 may have a pipe communicating with the fifth desorbed gas flow path 15 instead of the fifth opening 67. In the example shown in the figure, a recovery unit (not shown) for recovering desorbed gas including acid gas desorbed from the acid gas adsorbent is connected to the fifth opening 67 via the fifth valve 20. In the above desorbing step, the recovered gas passes through the fifth desorbing gas flow path 15, similarly to the second desorbing gas flow path 12. With such a configuration, the acid gas can be stably desorbed from the acid gas adsorbent. Figures 1 to 6 In the acid gas adsorption device 100 shown in FIG. 1 , in the above-mentioned desorption step, the desorption gas is supplied to the first desorption gas flow path 11, and the recovered gas passes through the second desorption gas flow path 12 and the third desorption gas flow path 13. Figure 7 As shown, the desorbed gas may be supplied to the second desorbed gas flow path 12 and the third desorbed gas flow path 13, and the recovered gas may pass through the first desorbed gas flow path 11. In this case, a desorbed gas supply unit (not shown) is connected to the second opening 62 and the third opening 63, and a recovery unit (not shown) is connected to the first opening 61. With such a configuration, the acid gas can be stably desorbed from the acid gas adsorbent. Industrial Applicability The acid gas adsorption device according to the embodiment of the present invention is used for separation and recovery of acid gas, and can be particularly well used in a carbon dioxide recovery, utilization and storage (CCUS) cycle. Explanation of symbols 1First adsorption part 2 Second adsorption part 6 Shell 11 First degassing gas flow path 12 Second separation gas flow path 13Third separation gas flow path 61 First Opening 64 inlet 65 outflow 70 First opening and closing 80 Second opening and closing 92 Next Door 93 compartments 94 flow path

Claims

1. An acid gas adsorption device, comprising an acid gas adsorption section through which a gas to be treated containing acid gas can pass in a predetermined direction, The acid gas adsorption unit includes: a first adsorption unit; and a second adsorption unit, the second adsorption unit being arranged at a distance from the first adsorption unit and on a downstream side in a passing direction of the gas to be treated, The first adsorption part includes a first flow path, The second adsorption part includes a second flow path, A first desorption gas flow path communicating with the first flow path and the second flow path is formed between the first adsorption portion and the second adsorption portion in the passing direction of the gas to be treated.

2. The acid gas adsorption device according to claim 1, wherein: The first adsorption part and the second adsorption part respectively include: a honeycomb substrate having a plurality of cells extending from a first end surface to a second end surface; and an acid gas adsorption layer, which is located in the compartment and contains an acid gas adsorption material, The compartment of the first adsorption portion includes the first flow path, The compartment of the second adsorption portion includes the second flow path.

3. The acid gas adsorption device according to claim 1 or 2, wherein: The acid gas is carbon dioxide.

4. The acid gas adsorption device according to claim 1 or 2, wherein: Also available: a housing for housing the acidic gas adsorption unit; as well as a first opening and closing valve, which is accommodated in the housing and can open and close the internal space of the housing and is arranged on the upstream side of the first adsorption part in the passing direction of the gas to be treated, When the first opening and closing valve is in a closed state, a second desorption gas flow path communicating with the first flow path is formed between the first opening and closing valve and the first adsorption portion in the passing direction of the gas to be treated.

5. The acid gas adsorption device according to claim 4, wherein: The housing has: an inlet located at one end of the housing in a direction in which the gas to be treated passes; an outlet located at the other end of the housing in the direction of passage of the gas to be treated; as well as a first opening, the first opening communicating with the first desorption gas flow path, The portion of the internal space of the housing where the first opening and closing valve is disposed constitutes a first opening and closing port opened and closed by the first opening and closing valve. An opening area of ​​the first opening and closing port is larger than an opening area of ​​the first opening.

6. The acid gas adsorption device according to claim 1 or 2, wherein: Also available: a housing for housing the acidic gas adsorption unit; as well as a second opening and closing valve, which is accommodated in the housing and can open and close the internal space of the housing, and is arranged on the downstream side of the second adsorption part in the passing direction of the gas to be treated, When the second opening and closing valve is in a closed state, a third desorption gas flow path communicating with the second flow path is formed between the second adsorption portion and the second opening and closing valve in the passing direction of the gas to be treated.

7. The acid gas adsorption device according to claim 6, wherein: The housing has: an inlet located at one end of the housing in a direction in which the gas to be treated passes; an outlet located at the other end of the housing in the direction of passage of the gas to be treated; as well as a first opening, the first opening communicating with the first desorption gas flow path, The portion of the internal space of the housing where the second opening and closing valve is disposed constitutes a second opening and closing port opened and closed by the second opening and closing valve. The opening area of ​​the second opening and closing opening is larger than the opening area of ​​the first opening.

8. The acid gas adsorption device according to claim 1 or 2, wherein: The first adsorption portion is divided into a plurality of parts in a direction orthogonal to a passing direction of the gas to be treated.

9. The acid gas adsorption device according to claim 1 or 2, wherein: The second adsorption portion is divided into a plurality of parts in a direction orthogonal to a passing direction of the gas to be treated.

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