Gas recovery unit, gas recovery method using the same, and carbon dioxide recovery apparatus

Abstract

One embodiment of the gas recovery unit of the present disclosure comprises a pellet-shaped solid absorbent material on which a gas absorbent substance is supported in a porous body; a solid absorbent material holder having a ventilation opening; a solid absorbent material holding net attached to the opening surface of the solid absorbent material holder; and a support enclosed within the solid absorbent material holder, having a plurality of cells with a polygonal cross-section extending in a first direction, wherein when the solid absorbent material is placed in the cells of the support, a space is formed between the solid absorbent material and the support through which gas is ventilated.

Description

Technical Field

[0001] The present disclosure relates to a gas recovery unit, a gas recovery method using the same, and a carbon dioxide recovery apparatus. This application claims priority based on Japanese Patent Application No. 2025-069332 filed in Japan on April 21, 2025, and incorporates its content herein.

Background Art

[0002] In recent years, the development of target gas recovery technologies has been promoted from various perspectives such as environmental load, energy conservation, and well-being. Among them, solid absorbents in which a porous body supports a liquid chemical substance or the like according to the target gas are widely used because they are easy to handle, such as being more space-saving than in the liquid state and capable of securing a reaction surface area, and thus have a wide range of applications and are attracting attention.

[0003] In handling this solid absorbent, for example, there is a packed bed method in which the solid absorbent is stored in a container through which gas passes in a stacked manner (see Patent Document 1). In this method, when absorbing or desorbing gas from the solid absorbent, it is common to use the PSA (Pressure Swing Adsorption) method that utilizes fluctuations in gas pressure and the TSA (Thermal Swing Adsorption) method that utilizes the temperature dependence of the gas absorption capacity of the solid absorbent. In gas recovery by the packed bed method, energy management and improvement of adsorption / desorption efficiency by devising the packing configuration and operating conditions have been studied.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] When using solid absorbents in a packed bed system, there are drawbacks such as high pressure loss and wear and damage to particles due to the flow of the absorbent. For example, the method disclosed in Patent Document 1 is a method for improving the efficiency of gas adsorption and desorption in a packed bed system, in which gas absorbent is filled into partitioned containers and gas deadsorption is performed sequentially in each partitioned container, but the drawbacks such as pressure loss and wear and damage to the absorbent are not resolved.

[0006] This disclosure has been made in view of the above-mentioned problems and aims to provide a gas recovery unit that can reduce pressure loss when using absorbent materials in a packed bed system and suppress wear and damage to absorbent materials. Another objective of this disclosure is to provide a gas recovery method and a carbon dioxide recovery apparatus using the gas recovery unit. [Means for solving the problem]

[0007] One embodiment of the gas recovery unit of the present disclosure comprises a pellet-shaped solid absorbent material on which a gas absorbent substance is supported in a porous body; a solid absorbent material holder having a ventilation opening; a solid absorbent material holding net attached to the opening surface of the solid absorbent material holder; and a support enclosed within the solid absorbent material holder, having a plurality of cells with a polygonal cross-section extending in a first direction, wherein when the solid absorbent material is placed in the cells of the support, a space is formed between the solid absorbent material and the support through which gas is ventilated.

[0008] One embodiment of the carbon dioxide recovery apparatus of the present disclosure comprises the gas recovery unit described above, an inclined section on which the gas recovery unit rolls, an adsorption section having an adsorption space that houses the gas recovery unit and the inclined section inside, an inflow section for introducing a gas containing carbon dioxide into the adsorption space, and a separation and extraction section for heating the solid absorbent material that has absorbed the carbon dioxide to separate and extract the gas.

[0009] One embodiment of the gas recovery method of the present disclosure comprises the steps of preparing the gas recovery unit described above, absorbing the gas into the solid absorbent, heating the solid absorbent that has absorbed the gas to separate the gas, and extracting the separated gas. [Effects of the Invention]

[0010] According to this disclosure, it becomes possible to reduce pressure loss and suppress wear and damage to the absorbent when using an absorbent in a packed bed system. [Brief explanation of the drawing]

[0011] [Figure 1] A conceptual diagram showing a typical example of a gas recovery unit according to Embodiment 1 of this disclosure. [Figure 2] An exploded perspective view showing an example of the configuration of a gas recovery unit according to Embodiment 1 of this disclosure. [Figure 3] An explanatory diagram illustrating the positional relationship between the support and the solid absorbent space within the gas recovery unit according to Embodiment 1 of this disclosure. [Figure 4] An explanatory diagram illustrating the size relationship between the support and the solid absorbent according to Embodiment 1 of this disclosure. [Figure 5] A perspective view showing a modified example of the solid absorbent in the gas recovery unit according to Embodiment 1 of the present disclosure. [Figure 6] A perspective view showing a solid absorbent according to Embodiment 1 of this disclosure. [Figure 7] A perspective view showing a solid absorbent according to Embodiment 1 of this disclosure. [Figure 8] A perspective view showing a solid absorbent according to Embodiment 1 of this disclosure. [Figure 9A] A schematic diagram showing an example of the configuration of a solid absorbent according to Embodiment 1 of this disclosure. [Figure 9B] A partially enlarged view of the solid absorbent according to Embodiment 1 of this disclosure. [Figure 10] An explanatory diagram illustrating the size relationship between the support and the solid absorbent according to a modified example of Embodiment 1 of this disclosure. [Figure 11]Flowchart showing the steps of the gas recovery method using the gas recovery unit according to Embodiment 2. [Figure 12] Schematic cross-sectional view showing a configuration example of the carbon dioxide recovery apparatus according to Embodiment 3 of the present disclosure.

Embodiments for Carrying Out the Invention

[0012] Hereinafter, a gas recovery unit according to an embodiment of the present disclosure, a gas recovery method using the same, and a carbon dioxide recovery apparatus will be described with reference to the drawings. Note that the scope of the present disclosure is not limited to the following embodiments, and can be arbitrarily changed within the scope of the technical idea of the present disclosure. In the following drawings, in order to make each configuration easy to understand, the scale and number in each structure may be different from those in the actual structure. Also, the same reference numerals are assigned to the same content and corresponding parts, and detailed description thereof may be omitted.

[0013] (Embodiment 1) FIG. 1 is a conceptual diagram showing a configuration example of a gas recovery unit 100 according to Embodiment 1. FIG. 2 is an exploded perspective view showing a configuration example of the gas recovery unit 100.

[0014] As shown in FIG. 1, the gas recovery unit 100 is formed in a columnar shape. As shown in FIG. 2, the gas recovery unit 100 includes a solid absorbent 80, a solid absorbent holder 100a, a support 100b, and a holding net (solid absorbent holding net) 100c. The solid absorbent holder 100a is cylindrical with an axis J1 extending in the first direction. The solid absorbent holder 100a has openings at both ends in the first direction. Gas (details will be described later) is ventilated through the openings in the solid absorbent holder 100a. The solid absorbent holder 100a has a rolling surface 100e on its outer periphery. The rolling surface 100e is circular when viewed in the first direction. That is, the solid absorbent holder 100a can roll along a rolling part in contact with the rolling surface 100e.

[0015] The holding net 100c is respectively attached to openings located on both sides of the solid absorbent holder 100a in the first direction. The holding net 100c has a ring portion 11 and a lattice portion 12. The ring portion 11 is an annular shape extending in the circumferential direction centered on the axis J1. The ring portion 11 is fitted into the opening of the solid absorbent holder 100a. The lattice portion 12 has wire rods 12A extending orthogonally to the first direction, arranged in a lattice pattern with gaps between them and orthogonal to each other. Both ends of the wire rods 12A of the lattice portion 12 are respectively fixed to the ring portion 11 from the inner circumferential side. The gaps between the wire rods 12A in the lattice portion 12 constitute the ventilation openings 12B.

[0016] The support 100b is enclosed within the solid absorbent holder 100a. The support 100b has a frame body 13. The frame body 13 forms a plurality of cells 14 with a cross-section orthogonal to the first direction being polygonal and extending in the first direction. The cells 14 in Embodiment 1 are, as an example, hexagonal in cross-section. That is, the support 100b has a plurality of honeycomb-shaped cells 14. The cells 14 penetrate the frame body 13 (support 100b) in the first direction.

[0017] The solid absorbent 80 is in pellet form. The solid absorbent 80 is arranged within the cell 14 as shown in FIG. 3. The solid absorbent 80 is cylindrical with an axis J2 extending in the second direction as the center. The axis J2 is parallel to the axis J1. That is, the solid absorbent 80 is arranged along the direction in which the cell 14 extends. When the solid absorbent 80 is arranged within the cell 14 of the support 100b, a space 100d is formed within the cell 14 between the solid absorbent 80 and the support 100b. Gas is ventilated through the space 100d.

[0018] In other words, when the solid absorbent 80 is placed in the cell 14 of the support 100b, a space 100d is formed within the cell 14. As a result, in the gas recovery unit 100, the density of the solid absorbent 80 when the support 100b is placed in the solid absorbent holder 100a is lower than when the support 100b is not placed in the solid absorbent holder 100a. The lower density of the solid absorbent 80 allows for more gas to flow into the solid absorbent holder 100a, thereby reducing gas pressure loss.

[0019] The size of the solid absorbent material 80 is essentially related to the size of the cells 14 in the support 100b. As shown in Figure 4, let H1 be the length of the solid absorbent material 80 in the second direction. Let R1 be the maximum length (maximum diameter) at the top surface 80a and bottom surface 80b of the solid absorbent material 80. More specifically, let R1 be the maximum length in the cross section perpendicular to the second direction over the entire length of the solid absorbent material 80 in the second direction. Also, let R2 be the cell diameter, which is the maximum length between the top surface (upper end) 50 and bottom surface (lower end) 51 of the cell 14 in the support 100b. More specifically, let R2 be the cell diameter in the cross section perpendicular to the first direction over the entire length of the cell 14 in the first direction. Let H2 be the length of the cell 14 in the first direction of the support 100b.

[0020] The maximum length R1 of the solid absorbent 80 is shorter than the cell diameter R2 of the support 100b. The length H1 of the solid absorbent 80 is shorter than the length H2 of the cell 14 and longer than the cell diameter R2. By setting the above relationship, the solid absorbent 80 can be positioned and aligned within the cell 14 of the support 100b, as shown in Figure 3, with the second direction in which the solid absorbent 80 extends parallel to the first direction in which the cell 14 extends. By positioning the solid absorbent 80 in an aligned manner within the cell 14, pressure loss is reduced compared to the case where the solid absorbent 80 is not aligned within the cell 14, because the curves in the gas flow path along the first direction into the solid absorbent holder 100a are reduced. In addition, the distance the solid absorbent 80 moves inside the gas recovery unit 100 is suppressed, which reduces wear and damage to the solid absorbent 80. Furthermore, the statement that the size of the solid absorbent 80 is substantially related to the size of the cells 14 in the support 100b indicates that more than 50% of the solid absorbent 80 contained within the gas recovery unit 100 is related to the size of the cells in the support 100b.

[0021] Furthermore, the solid absorbent material 80 may be cylindrical in shape extending in the second direction, or it may be a prism with a polygonal cross-section (a quadrangular prism in Figure 5), as shown in Figure 5. Even if the solid absorbent material 80 has a polygonal cross-section, the maximum length (diagonal length) R1 at the top surface 80a and bottom surface 80b is shorter than the cell diameter R2 of the support 100b. Also, the length H1 of the solid absorbent material 80 is shorter than the length H2 of the cell 14 and longer than the cell diameter R2. As a result, the solid absorbent material 80 can be placed and aligned within the cell 14 of the support 100b, and the pressure loss is reduced by minimizing the curves in the gas flow path into the solid absorbent material holder 100a. In addition, wear of the solid absorbent material 80 can be suppressed.

[0022] Furthermore, the solid absorbent 80 may be an ellipsoid obtained by rotating an ellipse around a major axis extending in the second direction. When the solid absorbent 80 is an ellipsoid, the maximum length R1 in the cross-section perpendicular to the second direction is the length of the minor axis of the ellipse. Also, when the solid absorbent 80 is an ellipsoid, the length H1 of the solid absorbent 80 in the second direction is the length of the major axis of the ellipse. Even when the solid absorbent 80 is an ellipsoid, by relating it to the size of the cells 14 in the support 100b, similar to the cylinder or prism described above, the bending portion of the gas flow path into the solid absorbent holder 100a is reduced, thereby reducing pressure loss. In addition, wear of the solid absorbent 80 can be suppressed.

[0023] As shown in Figure 6, the solid absorbent 80 has a gas contact surface 80d at the end in the second direction. The gas contact surface 80d is, for example, the top surface 80a. The solid absorbent 80 has a circular ventilation hole (through hole) 80c that penetrates in the second direction and opens to the top surface 80a and the bottom surface 80b. As shown in Figure 7, the solid absorbent 80 may have two ventilation holes 80c, or three or more. Also, as shown in Figure 8, the solid absorbent 80 may be a rectangular prism with ventilation holes 80c. The cross-sectional shape of the ventilation holes 80c is not limited to a circle, but may be elliptical or polygonal. By having ventilation holes 80c in the solid absorbent 80, the cross-sectional area for adsorbing and desorbing gas increases and the gas flow path increases compared to the case where there are no ventilation holes 80c, thus reducing pressure loss.

[0024] At least one of the solid absorbent holder 100a, support 100b, and holding net 100c that constitute the gas recovery unit 100 may include a material with high thermal conductivity. Examples of materials with high thermal conductivity include metallic materials such as aluminum (thermal conductivity, 1 atm, 20℃: 204 [W / m K]), tungsten (thermal conductivity, 1 atm, 20℃: 198 [W / m K]), iron (thermal conductivity, 1 atm, 20℃: 67 [W / m K]), nickel (thermal conductivity, 1 atm, 20℃: 26 [W / m K]), and zinc (thermal conductivity, 1 atm, 20℃: 113 [W / m K]). Preferably, the thermal conductivity is higher than that of the solid absorbent. By including a material with high thermal conductivity in at least one of the solid absorbent holder 100a, support 100b, and retaining net 100c, the necessary heat can be efficiently transferred to the solid absorbent 80 when desorbing the gas absorbed by the enclosed solid absorbent 80.

[0025] As shown in Figures 9A and 9B, the solid absorbent material 80 is a pellet in which a gas absorbent substance 20 is supported on a porous body 10. The porous body 10 is made of compressed inorganic particles containing silica particles. The inorganic particles containing silica particles may also contain alumina (aluminum oxide). The solid absorbent material 80 can be formed by, for example, compressing a powder material containing silica particles, which constitutes the inorganic particles of the solid absorbent material 80, with a pore-forming material, and then removing the pore-forming material by firing. Alternatively, the porous body 10 may be formed by intertwining a fibrous material containing silica particles with a pore-forming material. By forming pores 81 that are continuous in the depth direction in this way, a route can be secured for supporting the gas absorbent substance 20, which absorbs gas using chemical reactions.

[0026] Furthermore, by replacing alumina with a portion of the silica-containing powder material that constitutes the solid absorbent 80, the affinity between the solid absorbent 80 and the gas absorbent substance 20 can be increased. For example, hydrophilicity is caused by the formation of acid. When aluminum is present in the crystal, it is pulled by electrons from surrounding oxygen atoms to become an ion, and the negative charge is transferred to the oxygen atom, which has high electronegativity. As a result, hydrogen ions are attracted to the negatively charged oxygen atom, forming an OH group and releasing protons, which is an acid and improves the hydrophilicity of the surface of the solid absorbent 80.

[0027] The solid absorbent 80 can adsorb gases other than the gas absorbent 20 by utilizing the spaces in the pores 81. In other words, the solid absorbent 80 can absorb any gas by chemical absorption, which utilizes the chemical reaction caused by the gas absorbent 20, and by physical adsorption, which utilizes the partial pressure difference of the gas.

[0028] Furthermore, in the multiple pores 81 provided in the porous body 10, the average size of the inlet, which serves as the gas inlet, is preferably 1 nm or more and 100 nm or less. If the average size of the inlet is less than 1 nm, it becomes difficult to diffuse the gas to be absorbed. If the average size of the inlet is greater than 100 nm, the surface area of ​​the porous body 10 cannot be increased. Therefore, by setting the average inlet size of the pores 81 to 1 nm or more and 100 nm or less, more gas-absorbing material 20 can be formed on the side walls of the pores 81 and more can be supported. In addition, the porous body 10 may have a structure with secondary pores averaging 100 nm to 5 μm in order to promote the diffusion of the gas to be absorbed into the pores. Having secondary pores can improve the gas transport rate to the multiple pores 81 and improve the gas absorption rate. In addition, a stable gas flow path for the gas in contact with the gas-absorbing material 20 can be secured. The specific surface area of ​​the side walls of the pores 81 is 50 m². 2 It is preferable that the amount is 1 / g or more.

[0029] The gas absorbent substance 20 may include an amine compound having an amino group. An amino group is a monovalent functional group obtained by removing hydrogen from ammonia, a primary amine, or a secondary amine. Amine compounds can be broadly classified into primary amines, secondary amines, and tertiary amines. Primary amines, secondary amines, and tertiary amines are shown in chemical formulas (1), (2), and (3) below, respectively. This amino group can absorb carbon dioxide through the carbamate reaction shown in chemical formula (4) or the bicarbonate reaction shown in chemical formula (5).

[0030] [ka]

[0031] [ka]

[0032] [ka]

[0033] [ka]

[0034] [ka]

[0035] In the gas recovery unit 100 of this embodiment, when the solid absorbent 80 is filled into the cell 14 of the support 100b, a space 100d through which gas is ventilated is formed between the solid absorbent 80 and the support 100b. As a result, the number of gas passages flowing into the solid absorbent holder 100a increases, and the gas pressure loss can be reduced.

[0036] In the gas recovery unit 100 of this embodiment, the distance over which the solid absorbent 80 moves inside the gas recovery unit 100 is suppressed, thereby preventing wear and damage to the solid absorbent 80.

[0037] In the gas recovery unit 100 of this embodiment, the maximum length R1 of the cross-section of the solid absorbent 80 perpendicular to the second direction is shorter than the cell diameter R2 of the cross-section perpendicular to the first direction in the cell 14, and the length H1 of the solid absorbent 80 in the second direction is longer than the cell diameter R2 and shorter than the length H2 of the cell 14 of the support 100b. Therefore, the solid absorbent 80 can be arranged and aligned within the cell 14 of the support 100b with the second direction in which the solid absorbent 80 extends parallel to the first direction in which the cell 14 extends. By arranging and aligning the solid absorbent 80 within the cell 14, pressure loss can be reduced and wear and breakage of the solid absorbent 80 can be suppressed.

[0038] In the gas recovery unit 100 of this embodiment, since the gas contact surface 80d of the solid absorbent material 80 is provided with ventilation holes 80c extending in a second direction, the cross-sectional area for adsorbing and desorbing gas increases and the gas flow path increases compared to the case where there are no ventilation holes 80c, thus reducing pressure loss.

[0039] In the gas recovery unit 100 of this embodiment, when the support 100b is placed inside the solid absorbent holder 100a, the density occupied by the solid absorbent 80 is lower than when the support 100b is not placed inside the solid absorbent holder 100a. As a result, the number of gas channels flowing into the solid absorbent holder 100a increases, and gas pressure loss can be reduced.

[0040] In the gas recovery unit 100 of this embodiment, at least one of the solid absorbent holder 100a, the holding net 100c, and the support 100b contains a material with higher thermal conductivity than the solid absorbent 80. Therefore, when desorbing the gas absorbed by the enclosed solid absorbent 80, the necessary heat can be efficiently transferred to the solid absorbent 80.

[0041] In the gas recovery unit 100 of this embodiment, since the porous body 10 is a pellet made of inorganic particles including silica particles that have been compressed together, a route can be secured for supporting the gas-absorbing substance 20 that absorbs gas using a chemical reaction by compressing the powder material containing the inorganic silica particles with the pore-forming material and then removing the pore-forming material by firing.

[0042] In the gas recovery unit 100 of this embodiment, the solid absorbent 80 physically adsorbs gas in a portion of the pores 81 provided in the porous body 10, thus securing a route for supporting the gas absorbent substance 20 that absorbs gas using a chemical reaction.

[0043] In the gas recovery unit 100 of this embodiment, since the average inlet size of the multiple holes 81, which serve as gas inlets, is between 1 nm and 100 nm, a larger amount of gas-absorbing material 20 can be formed on the side walls of the holes 81, and a larger amount of gas-absorbing material 20 can be supported.

[0044] According to the gas recovery unit 100 in this embodiment, since the gas absorbent material 20 contains an amine compound having an amino group, it is possible to absorb carbon dioxide contained in the gas.

[0045] (modified version) In Embodiment 1, a configuration in which one solid absorbent 80 is placed in the cell 14 is illustrated, but the configuration is not limited to this. A configuration in which multiple solid absorbent 80 are placed in the cell 14 is also possible.

[0046] Figure 10 shows a modified example of Embodiment 1. In Figure 10, two solid absorbents 801 and 802 are shown arranged coaxially within cell 14. As shown in Figure 10, the length of the solid absorbent material 801 in the second direction is defined as H1a. The maximum length (maximum diameter) of the solid absorbent material 801 at the top surface 801a and the bottom surface 801b is defined as R1a. Let H1b be the length of the solid absorbent material 802 in the second direction. Let R1b be the maximum length (maximum diameter) at the top surface 802a and bottom surface 802b of the solid absorbent material 802.

[0047] The two solid absorbents 801 and 802 each have maximum lengths R1a and R1b that are shorter than the cell diameter R2. The two solid absorbents 801 and 802 each have lengths H1a and H1b that are longer than the cell diameter R2. The two solid absorbents 801 and 802 each have lengths H1a and H1b that are shorter than the cell length H2 of 14. The sum of the lengths H1a and H1b of the two solid absorbents 801 and 802 is shorter than the cell length H2 of 14. Even with this configuration, the same operation and effect as in Embodiment 1 above can be obtained. The number of solid absorbents placed in cell 14 may be three or more.

[0048] (Embodiment 2) In Embodiment 2, the gas recovery method using the gas recovery unit 100 described in Embodiment 1 will be explained with reference to Figure 11. Figure 11 is a flowchart showing the steps of the gas recovery method using the gas recovery unit 100 according to Embodiment 2.

[0049] As shown in Figure 11, first, one of the gas recovery units 100 described in Embodiment 1 is prepared (step S201). Then, the recovery atmosphere gas containing the gas to be recovered is absorbed into the solid absorbent material 80 of the gas recovery unit 100 (step S202). Then, the gas recovery unit 100 that has absorbed the gas is heated to desorb the absorbed gas from the solid absorbent material 80 (step S203). Finally, the desorbed gas is removed from the solid absorbent material 80 (step S204).

[0050] In the gas desorption process S203, the mixture is heated to a temperature of 60°C or higher and 80°C or lower. Heating to 60°C or higher allows the absorbed gas to be desorbed from the gas absorbent material 20 supported on the pore walls, while heating to 80°C or lower allows for desorption with lower energy. For example, if the gas absorbent material 20 is an amine solution widely used for carbon dioxide absorption and carbon dioxide is recovered, the separation and recovery of carbon dioxide by chemical absorption generally requires heating to around 120°C, so the energy required for recovery can be reduced.

[0051] (Embodiment 3) In Embodiment 3, a carbon dioxide recovery device 110 using the gas recovery unit 100 described in Embodiment 1 will be described with reference to Figure 12. Figure 12 is a schematic cross-sectional view showing an example of the configuration of a carbon dioxide recovery device 110 using the gas recovery unit 100 according to Embodiment 1.

[0052] As shown in Figure 12, the carbon dioxide recovery device 110 comprises the gas recovery unit 100 described above, a housing 120, an inlet 130, inclined sections 141 and 142, and a separation and extraction section 150.

[0053] The housing 120 has a recovery space 121, a separation section 122, and a transport space 123 inside. The recovery space 121 is the space in which gas recovery is performed by the gas recovery unit 100. Gas containing carbon dioxide flows into the recovery space 121 through the inlet 130. As an example, the housing 120 is attached to the outdoor unit (not shown) of an air conditioner. The housing 120 has openings on the rear side facing the outdoor unit (the back side of the page in Figure 11) and on the front side opposite the rear side (the front side of the page in Figure 11). The outdoor unit has a fan, and the rotation of this fan creates an airflow in the recovery space 121 from the front opening to the rear opening. That is, the front opening of the housing 120 is the inlet 130 into which gas containing carbon dioxide flows. The airflow in the recovery space 121 is discharged from the exhaust port 127 of the outdoor unit. The direction in which gas containing carbon dioxide flows in is not limited to the above and may be in other directions.

[0054] The inclined sections 141 and 142 are located in the recovery space 121. The inclined sections 141 and 142 are, for example, plate-shaped and inclined with respect to a horizontal plane. The carbon dioxide recovery device 110 only needs to have at least one inclined section. One end of the inclined section 141 is fixed to the side wall 124 of the housing 120, which is located on the side closer to the transport space 123. The inclined section 141 is inclined downwards as it approaches the side wall 125 opposite the side wall 124. The other end of the inclined section 141 is away from the side wall 125. One end of the inclined section 142 is fixed to the side wall 125. The inclined section 142 is inclined downwards as it approaches the side wall 124. The other end of the inclined section 142 is away from the side wall 124.

[0055] The inclined sections 141 and 142 are arranged alternately with inclined section 141 at the top and spaced apart toward the bottom. Inclined section 142 is located at the bottom. The gas recovery unit 100 rolls on the inclined sections 141 and 142 due to its own weight. The gas recovery unit 100 rolls as its rolling surface 100e rolls on the inclined sections 141 and 142.

[0056] The separation section 122 is located on the outside of the side wall 124. The separation section 122 extends upward from the same height as the other end of the lowest inclined section 142. The recovery space 121 and the separation section 122 are connected when a valve (not shown) is opened. The separation section 122 can accommodate multiple (five in Figure 11) gas recovery units 100 in the vertical direction.

[0057] The transport space 123 is located above the separation section 122. The transport space 123 is the space in which the gas recovery unit 100 housed in the separation section 122 is transported upward by the transport section 126. The gas recovery unit 100 transported through the transport space 123 is introduced into the inclined section 141 located at the uppermost position.

[0058] The separation and extraction unit 150 includes a heating unit 151 and a gas extraction unit 152. The heating unit 151 supplies high-temperature gas G to the gas recovery unit 100 housed in the separation unit 122 and heats it to desorb (separate) carbon dioxide from the gas recovery unit 100. Desorption of carbon dioxide from the gas recovery unit 100 may also be performed by applying pressure to the gas recovery unit 100 housed in the separation unit 122.

[0059] The gas extraction unit 152 extracts carbon dioxide C that has been desorbed from the gas recovery unit 100 in the separation unit 122. The carbon dioxide C desorbed from the gas recovery unit 100 is stored in the cylinder 153.

[0060] The operation of the carbon dioxide recovery device 110 and the carbon dioxide recovery method of the embodiment will be described. In Figure 11, the gas recovery unit 100 before or after gas (carbon dioxide) recovery is shown as an outlined circle, and the gas recovery unit 100 after gas (carbon dioxide) recovery is shown as a hatched circle. In addition, the axis J1 extending in the first direction and the axis J2 extending in the second direction of the gas recovery unit 100 are perpendicular to the plane of the paper in Figure 11.

[0061] In the carbon dioxide recovery device 110, the gas recovery unit 100 on the uppermost inclined section 141 rolls towards the side wall 125 due to its own weight and falls from one end of the inclined section 141 to the inclined section 142 located below it. After this, the gas recovery unit 100 on the inclined section 142 rolls towards the side wall 124 due to its own weight and falls from one end of the inclined section 142 to the inclined section 141 located below it. The gas recovery unit 100 then repeats the above rolling and falling process until it reaches the separation section 122.

[0062] On the other hand, the gas containing carbon dioxide flows into the recovery space 121 from the opening on the front of the housing 120 and flows in a direction perpendicular to the plane of the paper in Figure 11. That is, the direction of flow of the gas containing carbon dioxide in the recovery space 121 is the direction in which the ventilation opening 12B of the holding net 100c opens in the gas recovery unit 100, and the direction in which the space 100d extends within the cell 14 between the solid absorbent material 80 and the support 100b.

[0063] Therefore, the solid absorbent material 80 of the gas recovery unit 100 rolling on the inclined sections 141 and 142 can come into contact with the gas containing carbon dioxide over a wider surface area. Also, because the gas recovery unit 100 rolls on the inclined sections 141 and 142, the time the solid absorbent material 80 is in contact with the gas containing carbon dioxide is longer compared to when it simply falls through the recovery space 121. As a result, more carbon dioxide is recovered by the solid absorbent material 80. Furthermore, since one solid absorbent material 80 is held within one cell 14, wear caused by contact between the solid absorbent materials 80 can be suppressed.

[0064] When the gas recovery unit 100, which has rolled along the inclined sections 141 and 142, reaches the boundary with the separation section 122, the valve opens to house the gas recovery unit 100 into the separation section 122 and then the valve closes. Once the gas recovery unit 100 is housed in the separation section 122, high-temperature gas G is supplied from the heating section 151 of the separation and extraction section 150 to the separation section 122 to heat the gas recovery unit 100. The carbon dioxide recovered by the solid absorbent 80 is desorbed from the solid absorbent 80 by heating with the high-temperature gas G.

[0065] The gas extraction unit 152 extracts carbon dioxide C that has been desorbed from the gas recovery unit 100 in the separation unit 122. The carbon dioxide C desorbed from the gas recovery unit 100 is stored in the cylinder 153.

[0066] After carbon dioxide is desorbed from the gas recovery unit 100 in the separation section 122, it is transported by the transport section 126 to the upper part of the transport space 123, and then transported to the uppermost inclined section 141 in the recovery space 121. After this, as described above, the gas recovery unit 100 can recover carbon dioxide by repeatedly rolling and dropping on the inclined sections 141 and 142 and desorbing carbon dioxide in the separation section 122.

[0067] According to the carbon dioxide recovery device 110 of this embodiment, the gas recovery unit 100 that rolls on the inclined sections 141 and 142 comes into contact with the gas containing carbon dioxide and recovers the carbon dioxide. As a result, the time that the solid absorbent 80 is in contact with the gas containing carbon dioxide is extended, and more carbon dioxide can be recovered by the solid absorbent 80.

[0068] In the carbon dioxide recovery device 110 of this embodiment, since one solid absorbent 80 is held in one cell 14 in the gas recovery unit 100, it is possible to suppress wear caused by contact between the solid absorbent 80s.

[0069] Preferred embodiments of this disclosure have been described above with reference to the attached drawings, but it goes without saying that this disclosure is not limited to these examples. The shapes and combinations of the components shown in the above examples are just examples and can be modified in various ways based on design requirements, etc., without departing from the spirit of this disclosure.

[0070] For example, in the embodiment, a plurality of cells 14 with a polygonal cross-section extending in a first direction are illustrated, but the configuration is not limited to this. For example, a configuration in which a cotton-like support made of multiple intertwined linear bodies is used in combination may also be used. When a cotton-like support is used in combination, it is preferable to fill the space between the support 100b and the retaining net 100c with a cotton-like support that has high heat conductivity. By placing a cotton-like support with high heat conductivity between the support 100b and the retaining net 100c, the cotton-like support can function as a buffer and protect the solid absorbent material 80.

[0071] Furthermore, in the separation unit 122, when high-temperature gas G is supplied from the heating unit 151 to heat the gas recovery unit 100, the cotton-like support acts as a heat transfer material, thereby effectively heating the solid absorbent 80 and desorbing carbon dioxide.

[0072] The carbon dioxide recovery apparatus of this embodiment is just one example of its configuration, and the gas recovery unit may be fixedly positioned inside the carbon dioxide recovery apparatus. In that case, the shape of the solid absorbent holder is not limited to a cylindrical shape. [Explanation of Symbols]

[0073] 10 Porous material, 14 Cell, 20 Gas absorbent material, 80, 801, 802 Solid absorbent material, 80c Ventilation hole (through hole), 80d Gas contact surface, 81 Hole, 100 Gas recovery unit, 100a Solid absorbent material holder, 100b Support, 100c Holding net (solid absorbent material holding net), 100d Space, 100e Rolling surface, 110 Carbon dioxide recovery device, 120 Housing, 121 Recovery space, 130 Inlet, 141, 142 Inclined section, 150 Separation and extraction section

Claims

1. A pellet-shaped solid absorbent in which a gas absorbent material is supported on a porous body, A solid absorbent holder having a ventilation opening, A solid absorbent material holding net is attached to the opening of the solid absorbent material holder, A support enclosed within the solid absorbent holder, having a polygonal cross-section and multiple cells extending in a first direction, It has, The shape of the solid absorbent is a cylinder, prism, or ellipsoid extending in the second direction. When the solid absorbent is placed in the cell of the support, a space is formed between the solid absorbent and the support through which gas is passed. The maximum length of the cross-section of the solid absorbent material perpendicular to the second direction is shorter than the cell diameter, which is the maximum length of the cross-section perpendicular to the first direction in the cell. A gas recovery unit in which the length of the solid absorbent in the second direction is longer than the cell diameter and shorter than the length of the support in the first direction.

2. The solid absorbent has a gas contact surface at the end in the second direction, The gas contact surface is provided with a through hole extending in the second direction and having a circular or polygonal cross-section. The gas recovery unit according to claim 1.

3. Multiple of the solid absorbent materials are arranged within the cell. The maximum length of the cross-section of each of the multiple solid absorbents perpendicular to the second direction is shorter than the cell diameter, which is the maximum length of the cross-section perpendicular to the first direction in the cell. The lengths of each of the multiple solid absorbents in the second direction are longer than the cell diameter, and the sum of the lengths of the multiple solid absorbents in the second direction is shorter than the length of the support in the first direction. The gas recovery unit according to claim 1.

4. A pellet-shaped solid absorbent material comprising a gas absorbent substance supported on a porous body, A solid absorbent holder having a ventilation opening, A solid absorbent material holding net is attached to the opening of the solid absorbent material holder, A support enclosed within the solid absorbent holder, having a polygonal cross-section and multiple cells extending in a first direction, It has, When the solid absorbent is placed in the cell of the support, a space is formed between the solid absorbent and the support through which gas is passed. The solid absorbent holder is cylindrical, and the gas recovery unit is also provided.

5. The solid absorbent holder has a rolling surface on its outer circumference, The gas recovery unit according to claim 4.

6. The density of the solid absorbent when the support is placed in the solid absorbent holder is lower than when the support is not placed in the solid absorbent holder. A gas recovery unit according to any one of claims 1 to 5.

7. At least one of the solid absorbent holder, the solid absorbent holding net, and the support includes a material with higher thermal conductivity than the solid absorbent. A gas recovery unit according to any one of claims 1 to 5.

8. The porous material is a pellet made by compressing inorganic particles, including silica particles. A gas recovery unit according to any one of claims 1 to 5.

9. The inorganic particles containing the silica particles have alumina, The gas recovery unit according to claim 8.

10. The solid absorbent physically adsorbs gas in a portion of the pores provided in the porous body. A gas recovery unit according to any one of claims 1 to 5.

11. The average inlet size of the multiple holes that serve as gas inlets is between 1 nm and 100 nm. The gas recovery unit according to claim 10.

12. The gas absorbent material includes an amine compound having an amino group. A gas recovery unit according to any one of claims 1 to 5.

13. A gas recovery unit according to any one of claims 1 to 5, The inclined section on which the gas recovery unit rolls, A housing having a recovery space that houses the gas recovery unit and the inclined portion inside, An inlet for introducing a gas containing carbon dioxide into the aforementioned recovery space, A separation and extraction unit that heats the solid absorbent material that has absorbed carbon dioxide to separate and extract the gas, A carbon dioxide capture device equipped with the following features.

14. A step of preparing a gas recovery unit according to any one of claims 1 to 5. The process of allowing the solid absorbent to absorb the gas, A step of heating the solid absorbent material that has absorbed the gas to separate the gas, A step of extracting the separated gas, A gas recovery method equipped with the following features.

15. The gas absorbed by the gas absorbent is separated by heating the gas absorbent in a range of 60°C to 80°C. The gas recovery method according to claim 14.

Images