Filler for gas-liquid contact, and gas-liquid contact device

Abstract

To increase a gas-liquid interface between gas and absorbent liquid compared to a case of absorbing specific gas contained in gas flowing through a flow channel extending in one direction from the gas.SOLUTION: A filler for gas-liquid contact comprises a porous body that is formed of: a hydrophilic material which has the contact angle of less than 90° of to absorbent liquid absorbing specific gas; and a hydrophobic material which has the contact angle larger than 90° to absorbent liquid, and in which absorbent liquid permeates and flows in a portion formed of a hydrophilic material and a main flow channel through which gas containing specific gas flows along an external surface is formed, where a sub flow channel whose one end is connected to the main flow channel and which extends in a direction crossing one direction in which the main flow channel extends, which is formed of a hydrophobic material and into which gas flowing in the main flow channel enters is formed in the porous body.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a packing for gas-liquid contact and a gas-liquid contactor. [Background technology]

[0002] The packing for gas-liquid contact described in Patent Document 1 is a packing for gas-liquid contact that is obtained by performing a surface treatment to fix a nonwoven fabric of oxidized acrylic fibers on at least a part of the surface of a polymer material, and the gas-liquid contact is for absorbing and removing carbon dioxide, and the basis weight of the nonwoven fabric of oxidized acrylic fibers is 10 to 25 g / m 2 is within the range. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-170041 Summary of the Invention [Problem to be solved by the invention]

[0004] For example, there is a gas-liquid contact packing that absorbs a specific gas contained in a gas flowing through a flow path extending in one direction. Specifically, a plurality of plate-shaped porous bodies are arranged with their plate surfaces facing each other in the horizontal direction, and the space between adjacent porous bodies forms a flow path extending in one direction through which the gas flows. Pores are formed in the porous bodies, and an absorbing liquid that absorbs the specific gas is allowed to permeate and flow through the interior of the porous bodies with the pores formed. As a result, the gas flowing through the flow path extending in one direction comes into contact with the outer surface, which is the plate surface, of the porous body, and the specific gas contained in the gas is absorbed by the absorbing liquid flowing inside the porous body.

[0005] However, in such a configuration, most of the pores inside the porous body are filled with the absorbing liquid, and the gas-liquid interface between the gas and the absorbing liquid is limited to the outer surface of the porous body.

[0006] The object of the present disclosure is to increase the gas-liquid interface between the gas and the absorption liquid flowing inside the porous body, compared to when the gas-liquid interface between the gas and the absorption liquid flowing inside the porous body is limited to the outer surface of the porous body. [Means for solving the problem]

[0007] A packing for gas-liquid contact according to a first aspect of the present disclosure comprises a porous body formed of a hydrophilic material having a contact angle of less than 90° with an absorbing liquid that absorbs a specific gas, and a hydrophobic material having a contact angle of more than 90° with the absorbing liquid, the porous body having a main flow path formed therein through which the absorbing liquid permeates and flows into a portion formed of the hydrophilic material and through which a gas containing the specific gas flows along an outer surface, the porous body having one end connected to the main flow path and extending in a direction intersecting the extension direction of the main flow path, the sub-flow path being formed of the hydrophobic material and into which the gas flowing through the main flow path enters.

[0008] According to the above configuration, the gas flowing through the main flow path flows along the outer surface of the porous body. As a result, specific gases contained in the gas come into contact with the absorbing liquid that permeates the porous body in the portion formed of the hydrophilic material and flows therethrough, and are absorbed by the absorbing liquid and recovered. In this way, the outer surface of the porous body that comes into contact with the gas flowing through the main flow path forms the gas-liquid interface between the gas and the absorbing liquid.

[0009] Furthermore, a specific gas contained in the gas flowing through the main flow path is supplied to the sub-flow path formed of a hydrophobic material by diffusion, and at the boundary surface between the sub-flow path and the other parts of the porous body, the specific gas comes into contact with the absorbing liquid that has permeated and flowed through the porous body in the part formed of a hydrophilic material, and is absorbed by the absorbing liquid. In other words, the boundary surface between the sub-flow path and the other parts of the porous body also becomes a gas-liquid interface between the gas and the absorbing liquid.

[0010] In this way, the gas-liquid interface between the gas and the absorption liquid flowing inside the porous body can be increased compared to when the gas-liquid interface between the gas and the absorption liquid flowing inside the porous body is limited to the outer surface of the porous body.

[0011] A packing for gas-liquid contact according to a second aspect of the present disclosure is the packing for gas-liquid contact according to the first aspect, characterized in that the main flow paths extending in one direction are formed in multiple rows in an intersecting direction intersecting the one direction, and the sub-flow paths are formed so as to connect one of the main flow paths and another of the main flow paths adjacent to each other.

[0012] According to the above configuration, the specific gas contained in the gas flowing through the main flow path is supplied by diffusion from both sides of the sub-flow path formed of a hydrophobic material. The specific gas then comes into contact with and is absorbed by the absorbing liquid that permeates and flows through the porous body in the portion formed of a hydrophilic material at the boundary between the sub-flow path and the remaining portion of the porous body. This maintains a higher gas concentration in the sub-flow path than when only one end of the sub-flow path is connected to the main flow path, thereby improving the recovery performance of the specific gas from the gas.

[0013] A packing for gas-liquid contact according to a third aspect of the present disclosure is the packing for gas-liquid contact according to the first aspect, wherein the porous body is plate-shaped and made of the hydrophobic material, and has a plurality of cylindrical portions extending in a thickness direction with both ends exposed to the main flow path, the plate surfaces being arranged so as to face each other in the horizontal direction, the gap between a pair of adjacent porous bodies being the main flow path extending in one direction, and the cylindrical portions being the sub-flow path, and the value of index C1 in the following formula (1) is 0.005 or more and 5 or less, where tsp is the thickness of the plate-shaped porous body, K is the gas transfer coefficient, D is the gas diffusion coefficient, d is the diameter of the sub-flow path, and gap is the gap between adjacent porous bodies: JPEG2025129847000002.jpg1178

[0014] According to the above configuration, each parameter is determined so that the value of index C1 is equal to or greater than 0.005 and equal to or less than 5. Therefore, the recovery performance for recovering a specific gas from air can be improved compared to when index C1 is smaller than this range or larger than this range.

[0015] A packing for gas-liquid contact according to a fourth aspect of the present disclosure is the packing for gas-liquid contact according to the first aspect, wherein the porous bodies are plate-shaped and arranged in plurality with plate surfaces facing each other in a horizontal direction, the gap between a pair of adjacent porous bodies forms the main flow path extending in the one direction, the porous bodies are provided with a plurality of strip-shaped rectangular portions that traverse the porous body in a direction intersecting the one direction, the strip portions are made of the hydrophobic material, and are arranged in the one direction at predetermined intervals, the strip portions form the sub-flow paths, and the value of index C2 in the following formula (2) is 0.005 or more and 5 or less, where tsp is the thickness of the plate-shaped porous body, K is the gas transfer coefficient, D is the gas diffusion coefficient, Lo is the length of the strip portion in the one direction, and gap is the gap between adjacent porous bodies: JPEG2025129847000003.jpg1184

[0016] According to the above configuration, each parameter is determined so that the value of index C2 is equal to or greater than 0.005 and equal to or less than 5. Therefore, the recovery performance for recovering a specific gas from air can be improved compared to when index C2 is smaller than this range or larger than this range.

[0017] A packing for gas-liquid contact according to a fifth aspect of the present disclosure is the packing for gas-liquid contact according to the first aspect, wherein the porous bodies are plate-shaped and a plurality of the porous bodies are arranged so that the plate surfaces face each other in the horizontal direction, and a gap between a pair of adjacent porous bodies serves as the main flow path extending in the one direction, and the porous bodies are provided with crossing portions formed of the hydrophobic material and extending in the thickness direction of the porous bodies to cross the porous bodies, the crossing portions serving as the sub-flow paths, and the thickness of the plate-shaped porous body is denoted by tsp, the gas transfer coefficient is denoted by K, the gas diffusion coefficient is denoted by D, and the hydraulic diameter of the sub-flow path is denoted by D. H and the gap between adjacent porous bodies is defined as a gap, the value of index C3 in the following formula (3) is 0.005 or more and 5 or less. JPEG2025129847000004.jpg1182

[0018] According to the above configuration, each parameter is determined so that the value of index C3 is equal to or greater than 0.005 and equal to or less than 5. Therefore, the recovery performance for recovering a specific gas from the atmosphere can be improved compared to when index C3 is smaller than this range or larger than this range.

[0019] A packing for gas-liquid contact according to a sixth aspect of the present disclosure is the packing for gas-liquid contact according to the first aspect, wherein the porous bodies are plate-shaped and arranged in plurality so that the plate surfaces face each other in the horizontal direction, and the gap between a pair of adjacent porous bodies serves as the main flow path extending in the one direction, and the porous bodies are provided with the sub-flow path formed of the hydrophobic material and extending in the thickness direction of the porous body with only one end connected to the main flow path, and the thickness of the plate-shaped porous body is denoted by tsp, the depth of the sub-flow path by Lhole, the gas transfer coefficient by K, the gas diffusion coefficient by D, and the hydraulic diameter of the sub-flow path by D H and the gap between adjacent porous bodies is defined as a gap, the value of index C4 in the following formula (4) is 0.005 or more and 5 or less. JPEG2025129847000005.jpg1189

[0020] According to the above configuration, each parameter is determined so that the value of index C4 is equal to or greater than 0.005 and equal to or less than 5. Therefore, the recovery performance for recovering a specific gas from the atmosphere can be improved compared to when index C4 is smaller than this range or larger than this range.

[0021] A packing for gas-liquid contact according to a seventh aspect of the present disclosure is the packing for gas-liquid contact according to the first aspect, characterized in that the porous body is provided with an auxiliary flow path, one end of which is connected to the sub-flow path and which is made of the hydrophobic material.

[0022] According to the above configuration, the boundary surface between the auxiliary flow path, one end of which is connected to the sub-flow path, and the remaining portion of the porous body forms a gas-liquid interface between the gas and the absorption liquid, thereby improving the recovery performance of the specific gas from the gas.

[0023] A packing for gas-liquid contact according to an eighth aspect of the present disclosure is the packing for gas-liquid contact according to the first aspect, characterized in that the sub-channel formed of the hydrophobic material has a space formed therein that extends in a direction intersecting the direction in which the main channel extends and into which gas is supplied.

[0024] According to the above configuration, the sub-channel has a space portion formed therein that extends in a direction intersecting the direction in which the main channel extends and to which the gas is supplied. This allows the specific gas to be supplied to the sub-channel not only from the main channel but also from the space portion, thereby improving the recovery performance of the specific gas from the gas.

[0025] A packing for gas-liquid contact according to a ninth aspect of the present disclosure is the packing for gas-liquid contact according to the first aspect, characterized in that the porous bodies are plate-shaped, with a plurality of cylindrical gas flow paths formed therethrough and extending in the thickness direction, and the plate surfaces are arranged so as to face each other in the horizontal direction, and the gap between a pair of adjacent porous bodies forms the main flow path extending in the one direction, and the porous bodies are formed with cylindrical portions made of the hydrophobic material so as to radially cover the gas flow paths, with the cylindrical portions forming the sub-flow paths.

[0026] According to the above configuration, the cylindrical portion formed to cover the gas flow path into which gas enters from the main flow path serves as the sub-flow path, whereby gas in the gas flow path is also supplied to the sub-flow path, thereby improving the recovery performance of recovering a specific gas from the gas.

[0027] A gas-liquid contactor according to a tenth aspect of the present disclosure is characterized by comprising: a packing for gas-liquid contact according to any one of the first to ninth aspects; a housing in which the packing for gas-liquid contact is disposed; and a fan that causes a gas to flow along an outer surface of a porous body provided in the packing.

[0028] According to the above configuration, by providing the gas-liquid contactor with the gas-liquid contact packing according to any one of the first to eighth aspects, it is possible to reduce the energy consumption of the fan that transports the gas and the pump that transports the absorption liquid while maintaining the same recovery amount of the specific gas. [Brief explanation of the drawings]

[0029] [Figure 1] FIG. 1 is a perspective view showing a gas-liquid contactor including packing for gas-liquid contact according to a first embodiment of the present disclosure. [Figure 2] 1 is a cross-sectional view showing a gas-liquid contactor provided with packing for gas-liquid contact according to a first embodiment of the present disclosure. [Figure 3] FIG. 1 is a perspective view showing a porous body provided in a packing for gas-liquid contact according to a first embodiment of the present disclosure. [Figure 4] FIG. 1 is a front view showing a porous body provided in a packing for gas-liquid contact according to a first embodiment of the present disclosure. [Figure 5] 1 is a cross-sectional view showing a porous body provided in a packing for gas-liquid contact according to a first embodiment of the present disclosure. [Figure 6] FIG. 2 is a perspective view showing a porous body provided in a packing for gas-liquid contact according to a comparative example to the first embodiment of the present disclosure. [Figure 7] 1A and 1B are graphs showing the carbon dioxide recovery performance of packings for gas-liquid contact according to the first and second embodiments. [Figure 8] 3 is a graph showing the carbon dioxide recovery performance of the packing for gas-liquid contact according to the first embodiment. [Figure 9] 1A and 1B are graphs showing the carbon dioxide recovery performance of the packing for gas-liquid contact according to the first embodiment. [Figure 10] 1A and 1B are graphs showing the carbon dioxide recovery performance of the packing for gas-liquid contact according to the first embodiment. [Figure 11]10A and 10B are graphs showing the recovery performance of a specific gas in a packing for gas-liquid contact according to another embodiment of the present invention, which is different from the first embodiment. [Figure 12] 1A and 1B are graphs showing the carbon dioxide recovery performance of the packing for gas-liquid contact according to the first embodiment. [Figure 13] FIG. 10 is a perspective view showing a porous body provided in a packing for gas-liquid contact according to a second embodiment of the present disclosure. [Figure 14] FIG. 4 is a cross-sectional view showing a porous body provided in a packing for gas-liquid contact according to a second embodiment of the present disclosure. [Figure 15] 10 is a graph showing the carbon dioxide recovery performance of the packing for gas-liquid contact according to the second embodiment. [Figure 16] 10 is a graph showing the carbon dioxide recovery performance of the packing for gas-liquid contact according to the second embodiment. [Figure 17] FIG. 10 is an enlarged cross-sectional view showing a porous body provided in a packing for gas-liquid contact according to a third embodiment of the present disclosure. [Figure 18] FIG. 10 is a perspective view showing a porous body provided in a packing for gas-liquid contact according to a fourth embodiment of the present disclosure. [Figure 19] FIG. 10 is a front view showing a porous body provided in a packing for gas-liquid contact according to a fourth embodiment of the present disclosure. [Figure 20] FIG. 10 is a cross-sectional view showing a porous body provided in a packing for gas-liquid contact according to a fourth embodiment of the present disclosure. [Figure 21] FIG. 10 is a perspective view showing a porous body provided in a packing for gas-liquid contact according to a fifth embodiment of the present disclosure. [Figure 22] FIG. 10 is an enlarged cross-sectional view showing a porous body provided in a packing for gas-liquid contact according to a fifth embodiment of the present disclosure. [Figure 23] FIG. 10 is an enlarged cross-sectional view showing a porous body provided in a packing for gas-liquid contact according to a sixth embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0030] First Embodiment An example of packing for gas-liquid contact and a gas-liquid contactor according to a first embodiment of the present disclosure will be described with reference to Figures 1 to 12. Note that the drawings used in the following description are all schematic, and the dimensional relationships between elements, the ratios of elements, and the like do not necessarily correspond to the actual ones. Furthermore, arrow Z shown in the drawings indicates the up-down direction (vertical upward direction) of the gas-liquid contactor, arrow X indicates the width direction (horizontal direction) of the gas-liquid contactor, and arrow Y indicates the depth direction (horizontal direction) of the gas-liquid contactor.

[0031] (Configuration of the gas-liquid contactor 10) As shown in Fig. 1, the gas-liquid contactor 10 includes an apparatus main body 12 and a fan 24 that sends air into the apparatus main body 12. The apparatus main body 12 also includes a housing 14 and a gas-liquid contact filler 16 (hereinafter referred to as "filler 16") that is disposed inside the housing 14. By using the gas-liquid contactor 10 of this embodiment, carbon dioxide contained in air is reduced, thereby producing carbon dioxide-reduced air. Air is an example of a gas, and carbon dioxide is an example of a specific gas.

[0032] [14 chassis, 24 fans] As shown in FIG. 1, the housing 14 has a rectangular parallelepiped shape extending in the width direction, and the fan 24 is disposed so as to face a side wall 14a facing one side in the width direction.

[0033] 2, a filter 16a that prevents the passage of foreign matter is disposed on side wall 14a of housing 14 facing one side in the width direction so as to separate the inside and outside of housing 14. Furthermore, an eliminator 16b that prevents water droplets from scattering is disposed on side wall 14b of housing 14 facing the other side in the width direction so as to separate the inside and outside of housing 14.

[0034] Furthermore, a drain pipe 18 is provided on the bottom plate 14c of the housing 14 to drain the liquid inside the housing 14 to the outside.

[0035] In this configuration, the fan 24 blows air into the housing 14 through the filter 16a at a wind speed of, for example, 1.4 m / s.

[0036] [Filling 16] As shown in FIG. 2, the packing 16 having the plate-shaped porous body 20 is housed in the housing 14 together with a distributor 40 for supplying the absorption liquid to the packing 16 and a packing support 50 for supporting the packing 16.

[0037] -Distributor 40- As shown in Fig. 2, the distributor 40 is disposed in an upper portion inside the housing 14, and is configured to supply the absorbing liquid by dripping it downward to the packing 16. In this embodiment, as an example, a potassium-based alkaline aqueous solution is used as the absorbing liquid. The absorbing liquid absorbs carbon dioxide contained in the air.

[0038] -Filling 16- As shown in Fig. 2, the filler 16 is disposed below the distributor 40. The porous bodies 20 constituting the filler 16 are porous bodies containing interconnected bubbles (pores), and as shown in Fig. 3, a plurality of porous bodies 20 are provided, each in the form of a plate (sheet), and are arranged so that the plate surfaces (sheet surfaces) face each other in the depth direction. The gap between a pair of porous bodies 20 forms a main flow path 22 through which air flows, as shown in Fig. 5. This main flow path 22 extends linearly in the width direction. The width direction is an example of one direction.

[0039] The porous body 20 is formed of a hydrophilic material that is hydrophilic with respect to the absorbing liquid and a hydrophobic material that is hydrophobic with respect to the absorbing liquid. Here, a hydrophilic material that is hydrophilic is a material that has a contact angle with the absorbing liquid of less than 90°, and a hydrophobic material that is hydrophobic is a material that has a contact angle with the absorbing liquid of more than 90°. Originally, hydrophilicity and hydrophobicity are technical terms that indicate when the contact angle between water and a material is less than 90° and greater than 90°, respectively. However, for convenience, the terms hydrophilicity and hydrophobicity are used here based on the contact angle with the absorbing liquid. Depending on the type of specific gas to be recovered, an aqueous solution, an ionic liquid, an organic solvent, or the like is used as the absorbing liquid. Furthermore, the water permeability of the porous body 20 in the portion formed of the hydrophilic material is 2.2 × 10 -11 [m 2 ] or more 2.2 x 10 -9 [m 2 ]or less.

[0040] In this embodiment, for example, the height of the porous body 20 is 5 m, the width is 7 m, and the porosity of the porous body 20 is 50% or more and 99% or less.

[0041] Furthermore, the water permeability of the porous body 20 in the portion formed of the hydrophilic material is set to 2.2 × 10 -11 [m 2 ] or more 2.2 x 10 -9 [m 2 By setting the range to 0.2 [mm / s] or less, the absorption liquid supplied from the distributor 40 to the porous body 20 permeates and flows through the porous body 20 at a flow rate of 0.2 [mm / s] or more and 20 [mm / s] or less. The porous body 20 will be described in detail later.

[0042] -Packing Support 50- 2, the packing support 50 is disposed in the lower portion inside the housing 14 and supports the packing 16 from below. The absorption liquid discharged downward from the packing 16 is discharged to the outside of the housing 14 through the discharge pipe 18.

[0043] (action) Next, the functions of the packing 16 and the gas-liquid contactor 10 will be described.

[0044] When the fan 24 shown in Fig. 2 is operated, the fan 24 sends air at a velocity of 1.4 m / s through the filter 16a into the interior of the housing 14. As a result, as shown in Fig. 5, the air flows through the main flow path 22 formed between adjacent porous bodies 20. This air flows along the outer surfaces of the porous bodies 20.

[0045] 2 supplies the absorbing liquid to each of the porous bodies 20. The absorbing liquid supplied to the porous bodies 20 permeates into the portions of the porous bodies 20 formed of a hydrophilic material, and flows downward due to gravity at a flow rate of 0.2 mm / s or more and 20 mm / s or less.

[0046] As a result, carbon dioxide contained in the air penetrates the porous body 20 and comes into contact with the absorbing liquid flowing down, where it is absorbed by the absorbing liquid, thereby removing the carbon dioxide from the air. Specifically, at least the outer surface of the porous body 20 that comes into contact with the air flowing through the main flow path 22 becomes a gas-liquid interface where the air and the absorbing liquid come into contact, and at this gas-liquid interface, the carbon dioxide comes into contact with the absorbing liquid that penetrates the porous body 20 and flows, and is absorbed by the absorbing liquid. In this way, the amount of carbon dioxide contained in the air flowing through the main flow path 22 is reduced. Then, the air with the reduced amount of carbon dioxide passes through the eliminator 16b shown in FIG. 2, whereby the scattering of water droplets is suppressed and the air is discharged to the outside of the housing 14. The portion of the porous body 20 formed from a hydrophobic material is used as a secondary flow path, and details of this secondary flow path and the like will be described later.

[0047] (Main part configuration) Next, the porous body 20 provided in the packing 16 will be described in detail.

[0048] The porous body 20 provided in the packing 16 is an open-cell porous body having a plurality of pores formed therein, and as described above, is made of a hydrophilic material that is hydrophilic to the absorbing liquid and a hydrophobic material that is hydrophobic to the absorbing liquid.

[0049] As shown in FIGS. 3, 4, and 5, the porous body 20 has a plurality of cylindrical columnar portions 20a formed in a staggered pattern, with both ends exposed to the main flow path 22. The columnar portions 20a are formed of a hydrophobic material, and the remaining portions are formed of a hydrophilic material. As shown in FIG. 5, the columnar portions 20a serve as sub-flow paths 26 through which air flows or is filled. The sub-flow paths 26 extend in a depth direction that intersects with the width direction of the main flow path 22. Each sub-flow path 26 connects adjacent main flow paths 22 to each other. Furthermore, the cross section of each sub-flow path 26 taken along a plane perpendicular to the gas diffusion direction is smaller than the cross section of the main flow path 22 taken along a plane perpendicular to the air flow direction. The depth direction is an example of an intersecting direction.

[0050] In this embodiment, the thickness of the porous body 20 is tsp (see FIG. 5), the gap between adjacent porous bodies 20 is gap (see FIG. 5), the diameter of the cylindrical portion 20a is d (see FIG. 4), and the pitch between adjacent cylindrical portions 20a is P (see FIG. 4). The pitch P is 1.5 times the diameter d.

[0051] (Function of main components) 5, air flows through the main flow passage 22 formed between adjacent porous bodies 20. This air flows along the plate surfaces of the porous bodies 20.

[0052] 4, the porous body 20 has a plurality of cylindrical sections 20a formed of a hydrophobic material in a staggered pattern, with both ends exposed to the main flow path 22. Therefore, carbon dioxide contained in the air flowing through the main flow path 22 is supplied by diffusion from both sides of the secondary flow paths 26 formed by the cylindrical sections 20a, and the carbon dioxide comes into contact with and is absorbed by the absorbing liquid that permeates and flows through the porous body 20 in the portion formed of the hydrophilic material on the side surfaces (boundary surfaces) of the cylindrical sections 20a that form the secondary flow paths 26. In this way, the side surfaces (boundary surfaces) of the cylindrical sections 20a that form the secondary flow paths 26 also become gas-liquid interfaces where the air and the absorbing liquid come into contact with each other.

[0053] [Comparison of recovery performance] Next, the recovery performance when recovering carbon dioxide from the air using the packing 16 will be calculated in comparison with that of a comparative packing 66. First, the differences between the packing 66 and the packing 16 will be mainly described.

[0054] 6, the porous body 70 provided in the filler 66 does not have a cylindrical portion formed therein. In other words, the porous body 70 of the filler 66 is made only of a hydrophilic material, and no sub-flow passages are formed therein.

[0055] Here, it is assumed that the portion of the porous body 20 according to this embodiment that is made of a hydrophilic material is filled with an absorbing liquid, and that the outer surface of the portion made of the hydrophilic material and the side surface of the cylindrical portion 20a of the porous body 20 form a gas-liquid interface, i.e., a reaction surface that can absorb carbon dioxide. On the other hand, it is assumed that the inside of the porous body 70 according to the comparative embodiment is filled with an absorbing liquid, and that the outer surface of the porous body 70 forms a gas-liquid interface, i.e., a reaction surface that can absorb carbon dioxide. Then, the carbon dioxide absorption flux F [mol / m 2 / s) (flux: CO2 absorption amount per unit area per unit time) is determined by the following formula (1).

[0056] F = K × Cg (1)

[0057] In equation (1), K is the carbon dioxide transfer coefficient (0.24 mm / s), and Cg is the carbon dioxide concentration in the air (mol / m 3 〕

[0058] Carbon dioxide recovery rate Q [t / m 3 / year], the flux F is expressed as the volume per unit (1m 3 ), and multiplying by the number of seconds per year (31,536,000 [s]) and the molecular weight of carbon dioxide (44 [g / mol]).

[0059] The energy consumed in the operation of the gas-liquid contactor 10 consists of the energy Eg [J / s] required to send air into the packings 16, 66, and the potential energy El [J / s] required to supply the absorption liquid to the top surfaces of the packings 16, 66. These are determined by the following equations (2) and (3), respectively.

[0060] Eg=Vg×H×W×dP×L (2)

[0061] El=Vl×W×L×η×ρ×g×H (3)

[0062] In equation (2), Vg is the air velocity upstream of the packing materials 16 and 66 (1.4 m / s), H is the height of the packing materials 16 and 66 (m), W is the width of the packing materials 16 and 66 (width in the stacking direction of the porous material) (m), dP is the pressure loss per air passage distance (Pa / m), and L is the distance in the air passage direction (m).

[0063] In equation (3), Vl is the flow velocity of the absorbent in the porous bodies 20 and 70 (1.8 [mm / s]), η is the volume ratio of the hydrophilic material of the porous body to the total volume of the packing (-), and ρ is the density of the absorbent (1.1 [g / cm 3 ]), g is the acceleration due to gravity (9.8 [m / s 2 Then, the consumed energy E [GJ / t] is determined by the following formula (4).

[0064] E=(Eg+El) / (Q×H×W×L)···(4)

[0065] In the case of the filler 66 according to the comparative example, the carbon dioxide concentration Cg in the air is assumed to be uniform, and the concentration is 0.0166 [mol / m], which corresponds to 400 [ppm]. 3 〕

[0066] In contrast, in the case of the packing 16 according to this embodiment, the carbon dioxide concentration Cg at the gas-liquid interface in contact with the main air flow path 22 is 0.0166 [mol / m 3], taking into consideration the decrease in concentration due to absorption at the gas-liquid interface in contact with the sub-passage 26. In other words, the carbon dioxide concentration Cg was set to the steady-state concentration at which the consumption of carbon dioxide due to absorption at the gas-liquid interface in contact with the air sub-passage 26 and the supply due to diffusion are in balance.

[0067] The diffusion coefficient D of carbon dioxide is 16 mm 2 / s). Furthermore, the pressure drop dP was calculated assuming Poiseuille flow between flat plates. In this way, the recovery rate Q and consumed energy E were calculated with all conditions other than the structure being the same, so it is possible to compare the recovery rate Q and consumed energy E between packing structures for packing 16 and packing 66.

[0068] 7(A) is a graph showing a comparison between the energy consumption E of the packing 16 according to the first embodiment and the energy consumption E of the packing 66 according to the comparative embodiment. The vertical axis of the graph shown in FIG. 7(A) represents the energy consumption E [GJ / t], and the horizontal axis represents the carbon dioxide recovery rate Q [t / m 3 The black circles in the graph indicate the calculation results for packing 66, and the white circles in the graph indicate the calculation results for packing 16.

[0069] In this calculation, the thickness tsp of the porous body 70 of the packing 66 was set to 1 mm, and the gap between adjacent porous bodies 70 was set to 2.7 mm or more and 8.2 mm or less.

[0070] In contrast, the thickness tsp of the porous body 20 of the packing 16 is set to 7 mm, and the gap between adjacent porous bodies 20 is set to 8 mm or more and 40 mm or less. Furthermore, the diameter d of the cylindrical portion 20a is set to 1 mm, and the pitch P of the cylindrical portion 20a is set to 1.5 mm.

[0071] From the graph shown in Fig. 7(A), it can be seen that the filler 16 consumes less energy than the filler 66, and therefore has improved recovery performance for recovering carbon dioxide from air. Note that the squares in the graph of Fig. 7(A) will be described later.

[0072] In this way, in the porous body 20, the cylindrical portions 20a of the porous body 20 are not filled with the absorption liquid, and carbon dioxide contained in the air is supplied to the sub-flow passages 26 formed by the cylindrical portions 20a, thereby forming a gas-liquid interface inside the porous body 20 (inside the porous body plate (sheet)). Therefore, in the porous body 20, the gas-liquid interfacial area is increased, and recovery performance is improved, compared to the porous body 70, in which all of the internal pores are filled with the absorption liquid.

[0073] [Effect of each parameter on recovery performance] Next, in order to confirm the influence of each parameter of the packing 16 on the carbon dioxide recovery performance, multiple values ​​of each parameter were set, and the energy consumption E [GJ / t] and the carbon dioxide recovery rate Q [t / m 3 / year].

[0074] Figure 7(B) is a graph showing the influence of each parameter of the packing 16 on the carbon dioxide recovery performance. The vertical axis of the graph shown in Figure 7(B) shows the energy consumption E [GJ / t], and the horizontal axis shows the carbon dioxide recovery rate Q [t / m 3 / year]. In the graph, square indicates a case where multiple values ​​of thickness tsp are set, circle indicates a case where multiple values ​​of gap Gap are set, and triangle indicates a case where multiple values ​​of diameter d of cylindrical portion 20a are set. The pitch P was set to 1.5 times the diameter d.

[0075] When the thickness tsp is set to multiple values, the thickness tsp is set to multiple values ​​between 1 mm and 18 mm, the gap GAP is set to a constant value of 12 mm, and the diameter d is set to a constant value of 1 mm.

[0076] In addition, when multiple values ​​of the gap GAP are set, the gap GAP is set to multiple values ​​between 7 mm and 30 mm, the thickness tsp is set to a constant value of 7 mm, and the diameter d is set to a constant value of 1 mm.

[0077] Furthermore, when multiple values ​​of the diameter d are set, the diameter d is set to multiple values ​​between 0.6 mm and 2 mm, the thickness tsp is set to a constant value of 7 mm, and the gap gap is set to a constant value of 12 mm.

[0078] As shown in the graph in Figure 7(B), when multiple gap values ​​are set, the recovery speed increases and the energy consumption also increases. In other words, there is a trade-off between improving the recovery speed and reducing the energy consumption. Furthermore, the smaller the diameter d, the better the recovery performance.

[0079] On the other hand, there is a suitable range for the thickness tsp in which recovery performance is improved, and a range of 4 mm or more and 10 mm or less is preferable.

[0080] [Regarding indicator C1] Next, the relationship between the index C1 and the recovery rate Q [t / m3 / year] is calculated using the following formula (5). As mentioned above, there is a preferred range for the thickness tsp. Therefore, when calculating the index C1 and the recovery rate Q [t / m3 / year], multiple values ​​for the thickness tsp are set.

[0081] JPEG2025129847000006.jpg1178

[0082] 8, the vertical axis represents the recovery speed Q, and the horizontal axis represents the index C1. The graph shows the cases where the diameter d is 0.1 mm, 0.3 mm, and 1 mm.

[0083] The carbon dioxide transfer coefficient K for calculating the index C1 is set to 0.24 [mm / s], and the diffusion coefficient D is set to 16 [mm 2 / s]. Furthermore, the gap (gap) was set to 10 [mm], and the pitch (P) was set to 1.5 times the diameter (d). In other words, all parameters except for the thickness (tsp) were set to constant values.

[0084] As shown in the graph of Figure 8, in order to effectively capture carbon dioxide from air, the index C1 is preferably 0.005 to 5, more preferably 0.02 to 2, and most preferably 0.06 to 0.6. By using this index C1, an appropriate thickness tsp can be determined even when the processable diameter d, absorption liquid, and gas to be captured are different. Note that the index C1 of the packing 16 of this first embodiment is determined so that each parameter is 0.005 to 5.

[0085] 9(A) and (B) show graphs in which the vertical axis indicates the recovery speed Q and the horizontal axis indicates the index C1. The graphs show the cases in which the diameter d is 0.1 mm, 0.3 mm, and 1 mm, respectively. Regarding the graphs in FIGS. 9(A) and (B), differences from the graph in FIG. 8 will be mainly explained.

[0086] In the graph of Figure 9(A), the transfer coefficient K was set to 2 to calculate the index C1, and in the graph of Figure 9(B), the transfer coefficient K was set to 0.03 to calculate the index C1. A difference in the transfer coefficient K corresponds to a difference in pH in the case of carbon dioxide absorption by an alkaline aqueous solution.

[0087] 9(A) and (B), even when the value of the transfer coefficient K is changed, in order to effectively recover carbon dioxide from air, the index C1 is preferably 0.005 to 5, more preferably 0.02 to 2, and most preferably 0.06 to 0.6. Thus, the preferred ranges are the same as those in the graph shown in FIG.

[0088] 10(A) and (B) show graphs in which the vertical axis indicates the recovery speed Q and the horizontal axis indicates the index C1. The graphs show the cases in which the diameter d is 0.1 mm, 0.3 mm, and 1 mm, respectively. Regarding the graphs in FIGS. 10(A) and (B), differences from the graph in FIG. 8 will be mainly explained.

[0089] In the graph of FIG. 10(A), the gap was set to 5 mm to calculate the index C1, and in the graph of FIG. 10(B), the gap was set to 20 mm to calculate the index C1.

[0090] 10(A) and (B), even if the gap value is changed, in order to effectively capture carbon dioxide from the air, the index C1 is preferably 0.005 to 5, more preferably 0.02 to 2, and most preferably 0.06 to 0.6. Thus, the preferable ranges are the same as those in the graph shown in FIG.

[0091] 11(A) and (B) show graphs relating to a packing for gas-liquid contact according to another embodiment of the present invention. The other embodiment differs from the first embodiment only in the specific gas. This other embodiment targets the recovery of a specific gas other than carbon dioxide. For example, nitrogen oxides may be mentioned. 11(A) and (B) show graphs in which the vertical axis indicates the recovery speed Q and the horizontal axis indicates the index C1. The graphs show the cases in which the diameter d is 0.1 [mm], 0.3 [mm], and 1 [mm], respectively. The graphs in FIGS. 11(A) and (B) will be mainly explained with respect to the differences from the graph in FIG. 8.

[0092] In the graph of FIG. 11(A), the diffusion coefficient D is set to 8 mm 2 / s], and in the graph of Figure 11(B), in order to calculate the index C1, the diffusion coefficient D is set to 32 [mm 2 / s].

[0093] 11(A) and (B), even when the value of the diffusion coefficient D is changed, in order to effectively recover a specific gas from the atmosphere, the index C1 is preferably 0.005 to 5, more preferably 0.02 to 2, and most preferably 0.06 to 0.6. Thus, the preferred ranges are the same as those in the graph shown in FIG.

[0094] 12(A) and (B) show graphs in which the vertical axis indicates the recovery speed Q and the horizontal axis indicates the index C1. The graphs show the cases in which the diameter d is 0.1 mm, 0.3 mm, and 1 mm, respectively. The graphs in FIGS. 12(A) and (B) will be mainly explained with respect to the differences from the graph in FIG. 8.

[0095] In the graph of FIG. 12(A), the pitch P was set to 1.1 times the diameter d in order to calculate the index C1, and in the graph of FIG. 12(B), the pitch P was set to 2 times the diameter d in order to calculate the index C1.

[0096] 12(A) and (B), even when the value of pitch P is changed, in order to effectively capture carbon dioxide from air, the index C1 is preferably 0.005 to 5, more preferably 0.02 to 2, and most preferably 0.06 to 0.6. Thus, the preferred ranges are the same as those in the graph shown in FIG.

[0097] (summary) As described above, the porous body 20 of the packing 16 has a plurality of cylindrical sections 20a formed of a hydrophobic material in a staggered pattern, with both ends exposed to the main flow path 22. These cylindrical sections 20a serve as sub-flow paths 26. This makes it possible to increase the number of gas-liquid interfaces between the air and the absorbing liquid flowing inside the porous body 20, compared to when the gas-liquid interface between the air and the absorbing liquid flowing inside the porous body is limited to the outer surface of the porous body (as in the case of packing 66 according to the comparative embodiment).

[0098] Furthermore, the porous body 20 of the packing 16 has a plurality of cylindrical sections 20a formed of a hydrophobic material in a staggered pattern, with both ends exposed to the main flow path 22. These cylindrical sections 20a form the secondary flow paths 26. As a result, carbon dioxide contained in the air flowing through the main flow path 22 is supplied to the secondary flow paths 26 by diffusion from both sides of the secondary flow paths 26, and the carbon dioxide changes from a gas phase to a liquid phase and is absorbed from the outer circumferential surfaces of the cylindrical sections 20a that form the secondary flow paths 26. Therefore, the packing 16 can improve the carbon dioxide recovery performance compared to the packing 66 of the comparative embodiment.

[0099] Moreover, the index C1 of the packing 16 is set to be equal to or greater than 0.005 and equal to or less than 5. Therefore, in the packing 16, the carbon dioxide capture performance can be improved compared to when the index C1 is smaller than this range or larger than this range.

[0100] Furthermore, the gas-liquid contactor 10 is provided with packing 16. Therefore, compared to the case where packing 66 is provided, it is possible to reduce the energy consumption of the fan 24 that transfers air and the pump that transfers the absorbing liquid.

[0101] Second Embodiment Next, an example of packing for gas-liquid contact and a gas-liquid contactor according to a second embodiment will be described with reference to Figures 13 to 16. Note that, with regard to the second embodiment, differences from the first embodiment will be mainly described.

[0102] (Main part configuration) 13, the porous body 120 provided in the packing 116 according to the second embodiment has a plurality of rectangular strip portions 120a arranged in the width direction at predetermined intervals, the rectangular strip portions 120a extending vertically across the porous body 120 in a depth direction intersecting the width direction. In other words, the porous body 120 has a plurality of rectangular parallelepiped portions 124 arranged in the width direction, the rectangular strip portions 120a being divided by the rectangular strip portions 120a and extending vertically. The rectangular strip portions 120a are made of a hydrophobic material, and the rectangular parallelepiped portions 124 are made of a hydrophilic material.

[0103] As shown in FIG. 14, the gap between a pair of adjacent porous bodies 120 in the depth direction serves as a main flow path 22, and the strip portions 120a made of a hydrophobic material serve as sub-flow paths 126.

[0104] 14, in the second embodiment, the thickness of the porous body 120 is tsp, and the gap between adjacent porous bodies 120 is gap. Furthermore, the width of the rectangular parallelepiped portion 124 is Li, and the width of the strip portion 120a is Lo.

[0105] [Comparison of recovery performance] Next, the recovery performance when recovering carbon dioxide from the air using the filler 116 is calculated. The calculation method is the same as that for the filler 16 according to the first embodiment.

[0106] In this calculation, the thickness tsp of the porous body 120 of the filler 116 was set to 4 mm, and the gap between adjacent porous bodies 120 was set to 4 mm or more and 18 mm or less. Furthermore, the length Li of the rectangular parallelepiped portion 124 was set to 1 mm, and the length Lo of the strip portion 120a was set to 0.2 mm.

[0107] The squares in the graph of Fig. 7(A) indicate the recovery performance of the filler 116. As can be seen from the graph shown in Fig. 7(A), the filler 116 has improved recovery performance for recovering carbon dioxide from air compared to the filler 66 according to the comparative embodiment.

[0108] [Effect of each parameter on recovery performance] Next, in order to confirm the influence of each parameter of the packing 116 on the carbon dioxide recovery performance, multiple values ​​of each parameter were set, and the energy consumption E [GJ / t] and the carbon dioxide recovery rate Q [t / m 3 / year].

[0109] Fig. 15 is a graph showing the influence of each parameter of the packing 116 on the carbon dioxide recovery performance. The vertical axis of the graph shown in Fig. 15 is the energy consumption E [GJ / t], and the horizontal axis is the carbon dioxide recovery rate Q [t / m 3 / year]. The square in the graph indicates a case where multiple values ​​for thickness tsp are set, the circle in the graph indicates a case where multiple values ​​for gap gap are set, the triangle in the graph indicates a case where multiple values ​​for length Li are set, and the diamond in the graph indicates a case where multiple values ​​for length Lo are set.

[0110] When multiple values ​​of thickness tsp are set, thickness tsp is set to multiple values ​​between 1 mm and 8 mm, gap gap is set to a constant value of 12 mm, length Li is set to a constant value of 1 mm, and length Lo is set to a constant value of 0.2 mm.

[0111] Furthermore, when multiple values ​​of the gap (gap) are set, the gap is set to multiple values ​​between 7 mm and 20 mm, the thickness (tsp) is set to a constant value of 4 mm, the length (Li) is set to a constant value of 1 mm, and the length (Lo) is set to a constant value of 0.2 mm.

[0112] Furthermore, when multiple values ​​of the length Li are set, the length Li is set to multiple values ​​between 0.5 mm and 2.5 mm, the thickness tsp is set to a constant value of 4 mm, the gap gap is set to a constant value of 12 mm, and the length Lo is set to a constant value of 0.2 mm.

[0113] Furthermore, when multiple values ​​of the length Lo are set, the length Lo is set to multiple values ​​of 0.05 mm or more and 1 mm or less, the thickness tsp is set to a constant value of 4 mm, the gap gap is set to a constant value of 12 mm, and the length Li is set to a constant value of 1 mm.

[0114] As shown in the graph of FIG. 15, when the gap gap is set to multiple values, the recovery speed increases and the energy consumption also increases. In other words, there is a trade-off between improving the recovery speed and reducing the energy consumption. Regarding the length Li, the shorter the length Li, the better the recovery performance. However, if the length Li is too small, there is a concern that the manufacturing difficulty will increase.

[0115] On the other hand, there is a preferred range for thickness tsp in which recovery performance is improved, with a range of 2 mm to 6 mm being preferable. Similarly, there is a preferred range for length Lo in which recovery performance is improved, with a range of 0.15 mm to 0.4 mm being preferable. This is because when the width of sub-channel 126 is long and the length of sub-channel 126 in the carbon dioxide diffusion direction is short, the surface (boundary surface) forming the boundary between sub-channel 126 and other parts of the porous body is reduced, and when the width of sub-channel 126 is short and the length of sub-channel 126 in the carbon dioxide diffusion direction is long, the carbon dioxide concentration in sub-channel 126 is reduced.

[0116] [Regarding indicator C2] Next, the relationship between the index C2 and the recovery rate Q [t / m3 / year] is calculated using the following formula (6). As mentioned above, there is a suitable range for the thickness tsp in which recovery performance is improved. Therefore, when calculating the index C2, multiple values ​​for the thickness tsp are set.

[0117] JPEG2025129847000007.jpg1184

[0118] 16, the vertical axis represents the recovery speed Q, and the horizontal axis represents the index C2. The graph shows the cases where the length Li is 0.1 mm, 0.3 mm, and 1 mm.

[0119] The carbon dioxide transfer coefficient K for calculating the index C2 is set to 0.24 [mm / s], and the diffusion coefficient D is set to 16 [mm 2 / s). Furthermore, the gap (gap) was set to 10 mm, and the length (Lo) was set to 1 mm. In other words, all parameters except for the thickness (tsp) were set to constant values.

[0120] In this second embodiment, as shown in the graph of Figure 16, in order to effectively capture carbon dioxide from air, the index C2 is preferably 0.005 to 5, more preferably 0.02 to 2, and most preferably 0.06 to 0.6. By using this index C2, an appropriate thickness tsp can be determined even when the processable length Li, the absorption liquid, and the gas to be captured are different. Note that the parameters of the index C2 of the packing 116 in this second embodiment are determined so as to be 0.005 to 5.

[0121] (summary) As described above, in the packing 116, the gap between a pair of adjacent porous bodies 120 in the depth direction serves as the main flow path 22, and the strip portions 120a formed of a hydrophobic material serve as the sub-flow paths 126. This makes it possible to increase the gas-liquid interface between the air and the absorbing liquid flowing inside the porous body in the portion formed of the hydrophilic material, compared to when the gas-liquid interface between the air and the absorbing liquid flowing inside the porous body is limited to the outer surface of the porous body (in the case of the packing 66 according to the comparative embodiment).

[0122] In addition, in the packing 116, the strip portions 120a formed of a hydrophobic material serve as sub-flow paths 126. As a result, carbon dioxide contained in the air flowing through the main flow path 22 is supplied by diffusion from both sides of the sub-flow path 126, and the carbon dioxide comes into contact with the absorbing liquid that permeates and flows into the rectangular parallelepiped portion 124 and is absorbed at the wall surfaces (boundary surfaces) of the strip portions 120a that form the sub-flow path 126. Therefore, the packing 116 can improve the carbon dioxide recovery performance compared to the packing 66 according to the comparative embodiment.

[0123] Furthermore, the index C2 of the filler 116 is set to be equal to or greater than 0.005 and equal to or less than 5. Therefore, in the filler 116, the carbon dioxide capture performance can be improved compared to when the index C2 is smaller than this range or larger than this range.

[0124] (others) The hydraulic diameter DH of the columnar portion 20a or the strip portion 120a is twice the diameter d of the columnar portion 20a in the porous body 20 of the first embodiment, and twice the length Lo of the strip portion 120a in the porous body 120 of the second embodiment. The following formula (7) represents the ratio of the inflow of carbon dioxide into the sub-channel due to diffusion to the consumption due to absorption. The columnar portion 20a and the strip portion 120a are examples of cross-sectional portions.

[0125] JPEG2025129847000008.jpg1137

[0126] Therefore, extending this to sub-flow paths in general, the index C3 shown in the following formula (8) is preferably 0.005 or more and 5 or less, more preferably 0.02 or more and 2 or less, and most preferably 0.06 or more and 0.6 or less, similar to the aforementioned indexes C1 and C2.

[0127] JPEG2025129847000009.jpg1182

[0128] Furthermore, the hydraulic diameter DH of the cylindrical portion 20a in the porous body 20 of the first embodiment and the length Lo in the porous body 120 of the second embodiment is twice the diameter d of the cylindrical portion 20a or the rectangular portion 120a. Furthermore, the gas diffusion distance in the sub-channel when the sub-channel penetrates is tsp / 2, and the diffusion distance when only one end of the sub-channel is exposed to the main channel is equal to the depth Lhole of the sub-channel. Therefore, the following equation (9), in which tsp is replaced by 2Lhole, represents the ratio of the inflow of carbon dioxide into the sub-channel due to diffusion to the consumption by absorption.

[0129] JPEG2025129847000010.jpg1144

[0130] Therefore, in general, for sub-flow paths having only one end exposed to the main flow path, the index C4 shown in the following formula (10) is preferably 0.005 or more and 5 or less, more preferably 0.02 or more and 2 or less, and most preferably 0.06 or more and 0.6 or less, similar to the aforementioned indexes C1 and C2.

[0131] JPEG2025129847000011.jpg1193

[0132] Third Embodiment Next, an example of packing for gas-liquid contact and a gas-liquid contactor according to a third embodiment will be described with reference to Fig. 17. Note that, with regard to the third embodiment, differences from the first embodiment will be mainly described.

[0133] A cylindrical portion 20a is formed in a porous body 170 provided in a packing 166 according to the third embodiment, and the cylindrical portion 20a serves as a secondary flow path 26. Furthermore, a cylindrical portion 178, which is made of a hydrophobic material and has one end connected to the secondary flow path 26, is formed in the porous body 170. The cylindrical portion 178 serves as an auxiliary flow path 188, and the flow path cross section of the auxiliary flow path 188 is smaller than the flow path cross section of the secondary flow path 26.

[0134] In this configuration, in the filler 166, carbon dioxide comes into contact with the absorbing liquid that permeates and flows through the porous body 170 in the portion formed from the hydrophilic material and is absorbed at the boundary surface that forms the boundary between the secondary flow path 26 and auxiliary flow path 188 formed in the porous body 170 and other portions of the porous body, thereby improving carbon dioxide recovery performance.

[0135] <Fourth embodiment> Next, an example of packing for gas-liquid contact and a gas-liquid contactor according to a fourth embodiment will be described with reference to Figures 18 to 20. Note that, with regard to the fourth embodiment, differences from the first embodiment will be mainly described.

[0136] As shown in Figures 18, 19, and 20, a porous body 220 provided in a packing 216 according to the fourth embodiment has a plurality of cylindrical portions 220a formed in a staggered pattern, with both ends exposed to the main flow path 22. The cylindrical portions 220a are formed of a hydrophobic material, and the portions other than the cylindrical portions 220a are formed of a hydrophilic material. As shown in Figure 20, the cylindrical portions 220a serve as sub-flow paths 226 through which air flows or is filled, and the sub-flow paths 226 extend in a depth direction that intersects with the width direction in which the main flow path 22 extends. The sub-flow paths 226 are formed to connect adjacent main flow paths 22 to each other.

[0137] Furthermore, a cylindrical air flow path 230 is formed that penetrates the porous body 220 from front to back and is surrounded by this sub-flow path 226. Air flows through or is filled in this air flow path 230. In other words, the cylindrical sub-flow path 226 is formed so as to cover the air flow path 230 through which air flows or is filled. The air flow path 230 is an example of a gas flow path.

[0138] (summary) As described above, in the filler 216, the cylindrical sub-flow passage 226 is formed so as to cover the air flow passage 230 through which air flows or is filled. As a result, the air in the air flow passage 230 is also supplied to the sub-flow passage 226, and the carbon dioxide recovery performance can be improved compared to when no air flow passage is formed.

[0139] Fifth Embodiment Next, an example of packing for gas-liquid contact and a gas-liquid contactor according to a fifth embodiment will be described with reference to Figures 21 and 22. Note that, with regard to the fifth embodiment, differences from the first embodiment will be mainly described.

[0140] As shown in FIG. 21, the porous bodies 270 constituting the filler 266 according to the fifth embodiment are provided in multiple plate (sheet) shapes, and are arranged so that the plate surfaces (sheet surfaces) face each other in the depth direction.

[0141] 22, this porous body 270 is woven using a plurality of hydrophilic threads 272 made of a hydrophilic material and hydrophobic threads 282 made of a hydrophobic material. Gaps formed between the hydrophilic threads 272 and the hydrophobic threads 282 form pores. Furthermore, one end of the hydrophobic threads 282 faces one main flow path 22, and the other end of the hydrophobic threads 282 faces the other main flow path 22.

[0142] The absorbent liquid permeates and flows through gaps formed around the hydrophilic threads 272 made of a hydrophilic material. The gaps formed around the hydrophobic threads 282 serve as sub-channels 284 through which air flows or is filled, and the sub-channels 284 extend in a depth direction that intersects with the width direction in which the main channel 22 extends.

[0143] In this configuration, carbon dioxide contained in the air flowing through or filled in the sub-flow passage 284 comes into contact with the absorbing liquid flowing along the circumferential surface of the hydrophilic yarn 272 and is absorbed.

[0144] Sixth Embodiment Next, an example of packing for gas-liquid contact and a gas-liquid contactor according to a sixth embodiment will be described with reference to Fig. 23. Note that, with regard to the sixth embodiment, differences from the first embodiment will be mainly described.

[0145] As shown in Figure 23, multiple porous bodies 320 constituting the filler 316 in the sixth embodiment are provided, and are plate-shaped (sheet-shaped), and are arranged so that the plate surfaces (sheet surfaces) face each other in the depth direction.

[0146] 23, this porous body 320 is formed by mixing and solidifying hydrophilic particles 322 made of a hydrophilic material and hydrophobic particles 332 made of a hydrophobic material and hydrophobic particles, respectively. The gaps formed between the particles are pores.

[0147] The absorbing liquid permeates and flows through gaps formed on the circumferential surfaces of the hydrophilic particles 322 made of a hydrophilic material. The gaps formed on the circumferential surfaces of the hydrophobic particles 332 made of a hydrophobic material serve as sub-channels 334 through which air flows or is filled, and the sub-channels 334 extend in a depth direction that intersects with the width direction in which the main channel 22 extends.

[0148] In this configuration, carbon dioxide in the air flowing through or filled in the secondary flow passage 334 comes into contact with the absorbing liquid flowing along the circumferential surface of the hydrophilic particles 322 and is absorbed.

[0149] Although the present disclosure has been described in detail with respect to specific embodiments, it will be apparent to those skilled in the art that the present disclosure is not limited to such embodiments and that various other embodiments are possible within the scope of the present disclosure. For example, the problems of the present disclosure may be solved by combining the respective embodiments within the scope of the present disclosure.

[0150] In addition, in the above embodiment, a potassium-based alkaline aqueous solution is used as the absorption liquid for absorbing carbon dioxide, but other alkaline metal-based alkaline aqueous solutions, ammonia aqueous solutions, amine-based aqueous solutions, amino acid solutions, or ionic liquids may also be used.

[0151] Furthermore, in the above embodiment, the absorbing liquid absorbs carbon dioxide contained in the air inside the packing, but the absorbing liquid may also absorb other specific gases contained in other gases.

[0152] In the above embodiment, both ends of the sub-channel made of a hydrophobic material are connected to the main channel, but only one end of the sub-channel may be connected to the main channel.

[0153] In addition, in the above embodiment, the gas moves by diffusion into the secondary flow path formed of the hydrophobic material, but there may be a flow in the secondary flow path, that is, a specific gas component may be transported by advection.

[0154] Furthermore, in the first embodiment, the sub-flow passage 26 is formed by the cylindrical portion 20a, but the sub-flow passage may be formed to have an elliptical or rectangular cross section.

[0155] In the first, second and third embodiments, the filler indices C1, C2 and C3 are 0.005 or more and 5 or less, but they may be values ​​outside this range. In this case, however, the effect achieved by the indices C1, C2 and C3 being 0.005 or more and 5 or less will not be achieved.

[0156] (((1))) The porous body is formed of a hydrophilic material having a contact angle of less than 90° with an absorbing liquid that absorbs a specific gas, and a hydrophobic material having a contact angle of more than 90° with the absorbing liquid, and the absorbing liquid permeates and flows through the portion formed by the hydrophilic material, and a main flow path is formed in which a gas containing the specific gas flows along the outer surface, The porous body has a sub-flow passage formed therein, the sub-flow passage having one end connected to the main flow passage and extending in a direction intersecting the direction in which the main flow passage extends, the sub-flow passage being made of the hydrophobic material and into which the gas flowing through the main flow passage enters. Packing for gas-liquid contact.

[0157] (((2))) The main flow passages extending in the one direction are formed in a plurality of rows in an intersecting direction intersecting the one direction, The sub-channel is formed so as to connect one of the main channels and another of the main channels adjacent to each other. A packing for gas-liquid contact according to (((1))).

[0158] (((3))) the porous body is formed of the hydrophobic material and has a plate shape in which a plurality of cylindrical portions extending in a thickness direction and having both ends exposed to the main flow path are formed, the plurality of plate surfaces being arranged so as to face each other in a horizontal direction, a gap between a pair of adjacent porous bodies is defined as the main flow path extending in the one direction, The cylindrical portion serves as the secondary flow path, When the thickness of the plate-shaped porous body is tsp, the gas transfer coefficient is K, the gas diffusion coefficient is D, the diameter of the sub-channel is d, and the gap between adjacent porous bodies is gap, the value of index C1 in the following formula (1) is 0.005 or more and 5 or less. A packing for gas-liquid contact according to (((1))) or (((2))). JPEG2025129847000012.jpg1178

[0159] (((4))) The porous body is plate-shaped and a plurality of the porous bodies are arranged so that the plate surfaces face each other in the horizontal direction, a gap between a pair of adjacent porous bodies is defined as the main flow path extending in the one direction, the porous body has a plurality of rectangular strip portions formed of the hydrophobic material and extending in a vertical direction, the rectangular strip portions being arranged in the one direction at predetermined intervals and crossing the porous body in a cross direction intersecting the one direction, The strip portion is the secondary flow path, When the thickness of the plate-shaped porous body is tsp, the gas transfer coefficient is K, the gas diffusion coefficient is D, the length of the strip portion in one direction is Lo, and the gap between adjacent porous bodies is gap, the value of index C2 in the following formula (2) is 0.005 or more and 5 or less. A packing for gas-liquid contact according to (((1))) or (((2))). JPEG2025129847000013.jpg1184

[0160] (((5))) The porous body is plate-shaped and a plurality of the porous bodies are arranged so that the plate surfaces face each other in the horizontal direction, a gap between a pair of adjacent porous bodies is defined as the main flow path extending in the one direction, the porous body is provided with a crossing portion that is made of the hydrophobic material and extends in a thickness direction of the porous body and crosses the porous body; The crossing portion is the secondary flow path, The thickness of the plate-shaped porous body is tsp, the gas transfer coefficient is K, the gas diffusion coefficient is D, and the hydraulic diameter of the sub-channel is D. H and the gap between adjacent porous bodies is defined as “gap”, the value of the index C3 in the following formula (3) is 0.005 or more and 5 or less. A packing for gas-liquid contact according to (((1))) or (((2))). JPEG2025129847000014.jpg1182

[0161] (((6))) The porous body is plate-shaped and a plurality of the porous bodies are arranged so that the plate surfaces face each other in the horizontal direction, a gap between a pair of adjacent porous bodies is defined as the main flow path extending in the one direction, the porous body is provided with the sub-flow passage, which is made of the hydrophobic material, extends in a thickness direction of the porous body, and has only one end connected to the main flow passage; The thickness of the plate-shaped porous body is tsp, the depth of the sub-channel is Lhole, the gas transfer coefficient is K, the gas diffusion coefficient is D, and the hydraulic diameter of the sub-channel is D. H and the gap between adjacent porous bodies is defined as “gap”, the value of the index C4 in the following formula (4) is 0.005 or more and 5 or less. A packing for gas-liquid contact according to (((1))). JPEG2025129847000015.jpg1189

[0162] (((7))) the porous body is provided with an auxiliary flow path, one end of which is connected to the sub-flow path and which is made of the hydrophobic material; A packing for gas-liquid contact according to any one of (((1))) to (((6))).

[0163] (((8))) The sub-flow passage formed of the hydrophobic material has a space portion formed therein that extends in a direction intersecting with one direction in which the main flow passage extends and to which a gas is supplied. A packing for gas-liquid contact according to (((1))).

[0164] (((9))) The porous body is a plate-like body having a plurality of cylindrical gas flow paths formed therethrough in a thickness direction, the plate surfaces of the plate being arranged so as to face each other in a horizontal direction; a gap between a pair of adjacent porous bodies is defined as the main flow path extending in the one direction, the porous body has a cylindrical portion formed of the hydrophobic material and covering the gas flow path from a radial direction; The cylindrical portion serves as the secondary flow path. A packing for gas-liquid contact according to (((1))).

[0165] (((10))) A packing for gas-liquid contact according to any one of (((1))) to (((9))), a housing in which the gas-liquid contact packing is disposed; a fan that causes a gas to flow along the outer surface of a porous body provided in the packing; A gas-liquid contactor comprising: [Explanation of symbols]

[0166] 10 Gas-liquid contactor 14. Case 16 Filling 20 Porous materials 20a Cylindrical part 22 Main channel 24 Fans 26 Subchannel 116 Filling 120 Porous Materials 120a Strips 126 Subchannel 166 Filling 170 Porous Materials 188 Auxiliary flow path 216 Filling 220 Porous Materials 220a Cylindrical part 226 Subchannel 230 Air flow path 266 Filling 270 Porous Materials 284 Subchannel 316 Filling 320 Porous Materials 334 Subchannel

Claims

1. The porous body is formed of a hydrophilic material having a contact angle of less than 90° with an absorbing liquid that absorbs a specific gas, and a hydrophobic material having a contact angle of more than 90° with the absorbing liquid, and the absorbing liquid permeates and flows through the portion formed by the hydrophilic material, and a main flow path is formed in which a gas containing the specific gas flows along the outer surface, The porous body has a sub-flow passage formed therein, the sub-flow passage having one end connected to the main flow passage and extending in a direction intersecting the direction in which the main flow passage extends, the sub-flow passage being made of the hydrophobic material and into which the gas flowing through the main flow passage enters. Packing for gas-liquid contact.

2. The main flow passages extending in the one direction are formed in a plurality of rows in an intersecting direction intersecting the one direction, The sub-channel is formed so as to connect one of the main channels and another of the main channels adjacent to each other.

2. Packing for gas-liquid contact according to claim 1.

3. the porous body is formed of the hydrophobic material and has a plate shape in which a plurality of cylindrical portions extending in a thickness direction and having both ends exposed to the main flow path are formed, the plurality of plate surfaces being arranged so as to face each other in a horizontal direction, a gap between a pair of adjacent porous bodies is defined as the main flow path extending in the one direction, The cylindrical portion serves as the secondary flow path, When the thickness of the plate-shaped porous body is tsp, the gas transfer coefficient is K, the gas diffusion coefficient is D, the diameter of the sub-flow path is d, and the gap between adjacent porous bodies is gap, the value of index C1 in the following formula (1) is 0.005 or more and 5 or less:

2. Packing for gas-liquid contact according to claim 1.

4. The porous body is plate-shaped and a plurality of the porous bodies are arranged so that the plate surfaces face each other in the horizontal direction, a gap between a pair of adjacent porous bodies is defined as the main flow path extending in the one direction, the porous body has a plurality of rectangular strip portions formed of the hydrophobic material and extending in a vertical direction, the rectangular strip portions being arranged in the one direction at predetermined intervals and crossing the porous body in a cross direction intersecting the one direction, The strip portion is the secondary flow path, When the thickness of the plate-shaped porous body is tsp, the gas transfer coefficient is K, the gas diffusion coefficient is D, the length of the strip portion in one direction is Lo, and the gap between adjacent porous bodies is gap, the value of index C2 in the following formula (2) is 0.005 or more and 5 or less:

2. Packing for gas-liquid contact according to claim 1.

5. The porous body is plate-shaped and a plurality of the porous bodies are arranged so that the plate surfaces face each other in the horizontal direction, a gap between a pair of adjacent porous bodies is defined as the main flow path extending in the one direction, the porous body is provided with a crossing portion that is made of the hydrophobic material and extends in a thickness direction of the porous body and crosses the porous body; The crossing portion is the secondary flow path, The thickness of the plate-shaped porous body is tsp, the gas transfer coefficient is K, the gas diffusion coefficient is D, and the hydraulic diameter of the sub-channel is D. Ｈ and the gap between adjacent porous bodies is defined as "gap", the value of index C3 in the following formula (3) is 0.005 or more and 5 or less.

2. Packing for gas-liquid contact according to claim 1.

6. The porous body is plate-shaped and a plurality of the porous bodies are arranged so that the plate surfaces face each other in the horizontal direction, a gap between a pair of adjacent porous bodies is defined as the main flow path extending in the one direction, the porous body is provided with the sub-flow passage, which is made of the hydrophobic material, extends in a thickness direction of the porous body, and has only one end connected to the main flow passage; The thickness of the plate-shaped porous body is tsp, the depth of the sub-channel is Lhole, the gas transfer coefficient is K, the gas diffusion coefficient is D, and the hydraulic diameter of the sub-channel is D. Ｈ and the gap between adjacent porous bodies is defined as "gap", the value of index C4 in the following formula (4) is 0.005 or more and 5 or less.

2. Packing for gas-liquid contact according to claim 1.

7. the porous body is provided with an auxiliary flow path, one end of which is connected to the sub-flow path and which is made of the hydrophobic material; 2. Packing for gas-liquid contact according to claim 1.

8. The sub-flow passage formed of the hydrophobic material has a space portion formed therein that extends in a direction intersecting with one direction in which the main flow passage extends and to which a gas is supplied.

2. Packing for gas-liquid contact according to claim 1.

9. The porous body is a plate-like body having a plurality of cylindrical gas flow paths formed therethrough in a thickness direction, the plate surfaces of the plate being arranged so as to face each other in a horizontal direction; a gap between a pair of adjacent porous bodies is defined as the main flow path extending in the one direction, the porous body has a cylindrical portion formed of the hydrophobic material and covering the gas flow path from a radial direction; The cylindrical portion serves as the secondary flow path.

2. Packing for gas-liquid contact according to claim 1.

10. A packing for gas-liquid contact according to any one of claims 1 to 9, a housing in which the gas-liquid contact packing is disposed; a fan that causes a gas to flow along the outer surface of a porous body provided in the packing; A gas-liquid contactor comprising:

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