Filling material for gas-liquid contact and gas-liquid contact apparatus

Abstract

To increase the gas-liquid interface between a gas and an absorption liquid, compared with the case of absorbing a specific gas contained in a gas that flows through a channel extending in one direction.SOLUTION: A filling material for gas-liquid contact includes a porous body formed using a material having a contact angle of less than 90 degrees (°) with an absorption liquid for absorbing a specific gas, the absorption liquid permeating and flowing while a gas flowing along the outer surface. The filling material includes a main channel extending in one direction through which the gas flows while in contact with the outer surface of the porous body, and a sub-channel extending in a direction crossing the one direction, at least one end of which is connected to the main channel and whose channel cross section is smaller than that of the main channel.SELECTED DRAWING: Figure 5

Description

Technical Field

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

Background Art

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

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] For example, there is a packing for gas-liquid contact 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 so that their plate surfaces face each other in the horizontal direction, and the space between adjacent porous bodies is a flow path extending in one direction through which the gas flows. Pores are formed in this porous body, and an absorption liquid that absorbs a specific gas is allowed to permeate and flow inside the porous body in which the pores are 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 absorption liquid flowing inside the porous body.

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

[0006] The problem to be solved by the present disclosure is to increase the gas-liquid interface between a gas and an absorption liquid flowing inside a porous body as compared with the case where 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] The packing for gas-liquid contact according to the first aspect of the present disclosure includes a porous body formed using a material having a contact angle of less than 90 [°] with the absorption liquid, in which a main flow path is formed through which an absorption liquid that absorbs a specific gas penetrates and flows, and a gas containing the specific gas flows along the outer surface. In the porous body, a sub-flow path is formed, one end of which is connected to the main flow path, the cross-section of the flow path is smaller than that of the main flow path, and the sub-flow path extends in a direction intersecting the direction in which the main flow path extends.

[0008] According to the above configuration, the gas flowing through the main flow path flows along the outer surface of the porous body. Thereby, the specific gas contained in the gas contacts the absorption liquid that penetrates and flows through the porous body and is absorbed and recovered by the absorption liquid. Thus, the outer surface of the porous body that contacts the gas flowing through the main flow path becomes the gas-liquid interface between the gas and the absorption liquid.

[0009] Furthermore, the specific gas contained in the gas flowing through the main flow path is supplied to the sub-flow path by diffusion, and on the formation surface forming the sub-flow path, the specific gas contacts the absorption liquid that penetrates and flows through the porous body and is absorbed by the absorption liquid. That is, the formation surface forming the sub-flow path also becomes the gas-liquid interface between the gas and the absorption liquid.

[0010] In this way, the gas-liquid interface between the gas and the absorption liquid flowing inside the porous body can be increased as compared with the case where 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] The packing for gas-liquid contact according to the second aspect of the present disclosure is the packing for gas-liquid contact described in the first aspect, wherein the porous body is plate-shaped with a plurality of columnar circular holes extending in the thickness direction and penetrating therethrough, and a plurality of them are arranged such that the plate surfaces face each other in the horizontal direction. The gap between a pair of adjacent porous bodies is the main flow path extending in the one direction, and the sub-flow path formed by the circular holes is formed. When the thickness of the plate-shaped porous body is tsp, the gas transfer coefficient is K, the gas diffusion coefficient is D, the pore 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. JPEG2025095396000002.jpg1181

[0012] According to the above configuration, each parameter is determined so that the value of index C1 is 0.005 or more and 5 or less. For this reason, when index C1 is small or large with respect to this range, the recovery performance of recovering a specific gas from the gas can be improved.

[0013] The packing for gas-liquid contact according to the third aspect of the present disclosure is the packing for gas-liquid contact described in the first aspect, wherein the porous body is plate-shaped, and a plurality of them are arranged such that the plate surfaces face each other in the horizontal direction. The gap between a pair of adjacent porous bodies is the main flow path extending in the one direction, and in the porous body, a plurality of slits extending in the vertical direction and penetrating the porous body in the intersection direction intersecting the one direction are arranged at a predetermined interval in the one direction, and the slits are the sub-flow paths. When the thickness of the plate-shaped porous body is tsp, the gas transfer coefficient is K, the gas diffusion coefficient is D, the gap formed by the slits is Lgap, 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. JPEG2025095396000003.jpg1189

[0014] According to the above configuration, each parameter is determined such that the value of the index C2 is 0.005 or more and 5 or less. Therefore, when the index C2 is small or large with respect to this range, the recovery performance of recovering a specific gas from the gas can be improved as compared with the case where it is small or large with respect to this range.

[0015] The packing for gas-liquid contact according to the fourth 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 a plurality of the porous bodies are arranged such that the plate surfaces face in the horizontal direction, and the gap between a pair of adjacent porous bodies is the main flow path extending in the one direction, and a secondary flow path extending in the thickness direction of the porous body and penetrating therethrough is formed in the porous body. Let the thickness of the plate-shaped porous body be tsp, the gas transfer coefficient be K, the gas diffusion coefficient be D, and the hydraulic diameter of the secondary flow path be D H When the gap between adjacent porous bodies is denoted as gap, the value of the index C3 in the following formula (3) is 0.005 or more and 5 or less. JPEG2025095396000004.jpg1185

[0016] According to the above configuration, each parameter is determined such that the value of the index C3 is 0.005 or more and 5 or less. Therefore, when the index C3 is small or large with respect to this range, the recovery performance of recovering a specific gas from the gas can be improved as compared with the case where it is small or large with respect to this range.

[0017] The packing for gas-liquid contact according to the fifth 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 a plurality of the porous bodies are arranged such that the plate surfaces face in the horizontal direction, and the gap between a pair of adjacent porous bodies is the main flow path extending in the one direction, and a secondary flow path extending in the thickness direction of the porous body and having one end blocked is formed in the porous body. Let the depth of the secondary flow path be Lhole, the gas transfer coefficient be K, the gas diffusion coefficient be D, and the hydraulic diameter of the secondary flow path be D H When the gap between adjacent porous bodies is denoted as gap, the value of the index C4 in the following formula (4) is 0.005 or more and 5 or less. JPEG2025095396000005.jpg1191

[0018] According to the above configuration, each parameter is determined such that the value of index C4 is 0.005 or more and 5 or less. Therefore, when the index C4 is small or large with respect to this range, the recovery performance of recovering a specific gas from the gas can be improved as compared with the case where the index C4 is within this range.

[0019] The packing for gas-liquid contact according to the sixth 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 includes a large bubble region formed by a plurality of pores and a small bubble region formed by a plurality of pores smaller than the large bubble region. A plurality of the porous bodies are arranged such that the plate surfaces face in the horizontal direction, and the gap between a pair of adjacent porous bodies is the main flow path extending in the one direction. The absorption liquid penetrates and flows through the small bubble region formed in the porous body, and the large bubble region formed in the porous body is the sub-flow path.

[0020] According to the above configuration, a specific gas contained in the gas flowing through the main flow path is supplied to the large bubble region, which is the sub-flow path, by diffusion, and at the interface between the large bubble region and the small bubble region, the specific gas contacts and is absorbed by the absorption liquid that penetrates and flows through the small bubble region. Thereby, the recovery performance of recovering a specific gas from the gas can be improved.

[0021] The packing for gas-liquid contact according to the seventh aspect of the present disclosure is the packing for gas-liquid contact according to the first aspect, wherein a plurality of the main flow paths extending in the one direction are formed side by side in a crossing direction crossing the one direction, and the sub-flow path is formed so as to connect one of the adjacent main flow paths and the other main flow path.

[0022] According to the above configuration, a specific gas contained in the gas flowing through the main flow path is supplied by diffusion from both sides of the sub-flow path, and the specific gas contacts and is absorbed by the absorption liquid that penetrates and flows through the porous body on the formation surface forming the sub-flow path. Thereby, compared with the case where only one end of the sub-flow path is connected to the main flow path, the gas concentration in the sub-flow path is maintained high, so that the recovery performance of recovering a specific gas from the gas can be improved.

[0023] The filler for gas-liquid contact according to the eighth aspect of the present disclosure is the filler for gas-liquid contact according to the first aspect, characterized in that an auxiliary flow path having one end connected to the sub-flow path is formed in the porous body.

[0024] According to the above configuration, on the formation surface forming the auxiliary flow path having one end connected to the sub-flow path, a specific gas contained in the gas penetrates the porous body and contacts the absorption liquid flowing therethrough and is absorbed by the absorption liquid. Thereby, the recovery performance of recovering a specific gas from the gas can be improved.

[0025] The gas-liquid contact device according to the ninth aspect of the present disclosure includes the filler for gas-liquid contact according to any one of the first to eighth aspects, a housing in which the filler for gas-liquid contact is disposed, and a fan that flows gas along the outer surface of the porous body provided in the filler.

[0026] According to the above configuration, by the gas-liquid contact device including the filler for gas-liquid contact according to any one of the first to seventh aspects, the energy consumption of the fan for transferring the gas and the pump for transferring the absorption liquid can be reduced while maintaining the same recovery amount of the specific gas.

Brief Description of the Drawings

[0027]

Figure 1

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Figure 12

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Figure 18

MODE FOR CARRYING OUT THE INVENTION

[0028] <First Embodiment> An example of the packing for gas-liquid contact and a gas-liquid contact device according to the first embodiment of the present disclosure will be described with reference to FIGS. 1 to 12. Note that the drawings used in the following description are all schematic, and the dimensional relationships of the respective elements, the ratios of the respective elements, etc. do not necessarily match the actual ones. Further, the arrow Z shown in the figure indicates the vertical direction (vertically upward direction) of the gas-liquid contact device, the arrow X indicates the width direction (horizontal direction) of the gas-liquid contact device, and the arrow Y indicates the depth direction (horizontal direction) of the gas-liquid contact device.

[0029] (Configuration of Gas-Liquid Contact Device 10) As shown in FIG. 1, the gas-liquid contact device 10 includes a device main body 12 and a fan 24 that sends air into the device main body 12. The device main body 12 includes a housing 14 and a packing 16 for gas-liquid contact (hereinafter referred to as "packing 16") disposed inside the housing 14. By using the gas-liquid contact device 10 of the present embodiment, carbon dioxide contained in the air is reduced from the air, and thus air with reduced carbon dioxide can be obtained. Air is an example of a gas, and carbon dioxide is an example of a specific gas.

[0030] 〔Housing 14, Fan 24〕 As shown in FIG. 1, the housing 14 has a rectangular parallelepiped shape extending in the device width direction, and the fan 24 is disposed so as to face the side wall 14a facing one side in the device width direction.

[0031] On one side wall 14a facing one side in the device width direction in the housing 14, as shown in FIG. 2, a filter 16a for preventing foreign matter from passing through is arranged so as to partition the inside and outside of the housing 14. Further, on the other side wall 14b facing the other side in the device width direction in the housing 14, an eliminator 16b for preventing water droplets from scattering is arranged so as to partition the inside and outside of the housing 14.

[0032] Furthermore, a discharge pipe 18 for discharging the liquid inside the housing 14 to the outside is provided on the bottom plate 14c of the housing 14.

[0033] In this configuration, the fan 24 is configured to send air with a wind speed of 1.4 [m / s] into the housing 14 through the filter 16a as an example in this embodiment.

[0034] 〔Filling material 16〕 The filling material 16 including the plate-shaped porous body 20 is accommodated in the housing 14 together with a distributor 40 for supplying the absorption liquid to the filling material 16 and a packing support 50 for supporting the filling material 16, as shown in FIG. 2.

[0035] -Distributor 40- The distributor 40 is arranged in the upper part inside the housing 14 as shown in FIG. 2, and is configured to drip the absorption liquid downward to supply it to the filling material 16. In this embodiment, as an example, an aqueous potassium-based alkaline solution with a potassium ion concentration of 2.0 [mol / L] is used as the absorption liquid. And the absorption liquid is configured to absorb carbon dioxide contained in the air.

[0036] -Filling material 16- As shown in Fig. 2, the filler 16 is disposed below the distributor 40. Further, the porous body 20 constituting the filler 16 is a porous body containing communicating air bubbles, and as shown in Fig. 3, a plurality of the porous bodies 20 are provided, and they are plate-shaped (sheet-shaped), and the plate surfaces (sheet surfaces) are arranged to face each other in the depth direction. And the gap between the pair of porous bodies 20 is defined as 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.

[0037] Further, the porous body 20 is formed using polyvinyl alcohol that is partially acetalized and has hydrophilicity with respect to the absorption liquid, and the air bubbles (pores) of the porous body 20 communicate with each other. In the present embodiment, the porous body 20 has a water permeability of 2.2×10 -11 [m 2 or more and 2.2×10 -9 [m 2 or less. Here, the hydrophilic material is a material having a contact angle with the absorption liquid of less than 90 [°].

[0038] In the present embodiment, as an example, the height of the porous body 20 is 5 [m], and the length in the width direction is 7 [m]. Further, the porosity of the porous body 20 is 50 [%] or more and 99 [%] or less.

[0039] Furthermore, by setting the water permeability in the range of 2.2×10 -11 [m 2 or more and 2.2×10 -9 [m 2 or less, the absorption liquid supplied from the distributor 40 to the porous body 20 penetrates and flows through the porous body 20 at a flow-down speed of 0.2 [mm / s] or more and 20 [mm / s] or less. Details of the porous body 20 will be described later.

[0040] - Packing support 50 - As shown in FIG. 2, the packing support 50 is disposed in the lower part inside the housing 14 and supports the packing 16 from below. The absorbent liquid discharged downward from the packing 16 is discharged from the discharge pipe 18 to the outside of the housing 14.

[0041] (Function) Next, the functions of the packing 16 and the gas-liquid contact device 10 will be described.

[0042] When the fan 24 shown in FIG. 2 operates, the fan 24 sends air with a wind speed of 1.4 [m / s] into the housing 14 through the filter 16a. As a result, as shown in FIG. 5, air flows through the main flow path 22 formed between adjacent porous bodies 20. This air flows along the outer surface of the porous body 20.

[0043] Also, the distributor 40 shown in FIG. 2 supplies the absorbent liquid to each porous body 20. The absorbent liquid supplied to the porous body 20 penetrates into the porous body 20 and flows downward from above at a flow-down speed of 0.2 [mm / s] or more and 20 [mm / s] or less due to gravity.

[0044] Thereby, carbon dioxide contained in the air contacts the absorbent liquid flowing down by penetrating into the porous body 20 and is absorbed by the absorbent liquid, and carbon dioxide is removed from the air. Specifically, at least the outer surface in contact with the air flowing through the main flow path 22 in the porous body 20 becomes a gas-liquid interface where the air and the absorbent liquid contact each other. At this gas-liquid interface, carbon dioxide contacts the absorbent liquid flowing through the porous body and is absorbed by the absorbent liquid. In this way, the amount of carbon dioxide contained in the air flowing through the main flow path 22 decreases. Then, the air with the reduced amount of carbon dioxide passes through the eliminator 16b shown in FIG. 2, suppressing the scattering of water droplets and being discharged to the outside of the housing 14.

[0045] (Main component configuration) Next, the porous body 20 provided in the packing 16 will be described in detail.

[0046] The porous body 20 provided in the filler 16 is a porous body of continuous bubbles with a plurality of pores formed inside. As shown in FIGS. 3 and 4, the porous body 20 has a plurality of circular holes 20a penetrating through the front and back surfaces formed in a staggered pattern. And, as shown in FIG. 5, the inside of the circular hole 20a is a sub-channel 26 through which air flows or is filled, and the sub-channel 26 extends in the depth direction intersecting the width direction in which the main channel 22 extends. Further, this sub-channel 26 is formed so as to connect one adjacent main channel 22 and the other main channel 22. Furthermore, the cross-sectional area of the flow path by the plane orthogonal to the gas diffusion direction of this sub-channel 26 is made smaller than the cross-sectional area of the flow path by the plane orthogonal to the air flow direction of the main channel 22. The depth direction is an example of the intersecting direction.

[0047] In the present 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 pore diameter of the circular hole 20a is d (see FIG. 4), and the hole pitch between adjacent circular holes 20a is P (see FIG. 4). Note that the hole pitch P is 1.5 times the pore diameter d.

[0048] (Function of the main component configuration) As shown in FIG. 5, air flows through the main channel 22 formed between adjacent porous bodies 20. This air flows along the plate surface of the porous body 20.

[0049] Here, as shown in FIG. 4, the porous body 20 has a plurality of cylindrical circular holes 20a penetrating through the front and back surfaces formed in a staggered pattern. For this reason, carbon dioxide contained in the air flowing through the main channel 22 is supplied by diffusion from both sides of the sub-channel 26 formed by the circular hole 20a, and on the side surface (forming surface) of the cylindrical circular hole 20a forming the sub-channel 26, the carbon dioxide penetrates into the porous body and contacts and is absorbed by the absorbing liquid flowing therein. In this way, the inner peripheral surface (forming surface) of the circular hole 20a forming the sub-channel 26 also becomes a gas-liquid interface where air and the absorbing liquid come into contact.

[0050] 〔Comparison of recovery performance〕 Next, the recovery performance when recovering carbon dioxide in the air using the filler 16 is calculated by comparison with the filler 66 according to the comparative form. First, the differences between the filler 66 according to the comparative form and the filler 16 will be mainly described.

[0051] As shown in FIG. 6, no circular holes are formed in the porous body 70 provided in the filler 66. That is, no sub-channel is formed in the porous body 70 of the filler 66.

[0052] Here, it is assumed that the inside of the porous body 20 according to the present embodiment is filled with the absorption liquid, and in the porous body 20, the outer surface and the side surface of the cylindrical circular hole 20a become the gas-liquid interface, that is, the reaction surface capable of absorbing carbon dioxide. On the other hand, it is assumed that the inside of the porous body 70 according to the comparative form is filled with the absorption liquid, and in the porous body 70, the outer surface becomes the gas-liquid interface, that is, the reaction surface capable of absorbing carbon dioxide. And the carbon dioxide absorption flux F [mol / m 2 / s] (flux. The amount of CO2 absorbed per unit area per unit time.) is determined by the following formula (1). F = K × Cg ······ (1)

[0053] K in formula (1) is the transfer coefficient of carbon dioxide (0.24 [mm / s]), and Cg is the carbon dioxide concentration in the air [mol / m 3 .

[0054] Regarding the carbon dioxide recovery rate Q [t / m 3 / year], the flux F is integrated over the reaction surface included in the unit volume (1 m 3 ), and further multiplied by the number of seconds per year 31536000 [s] and the molecular weight of carbon dioxide 44 [g / mol].

[0055] The energy consumed in the operation of the gas-liquid contact device 10 consists of the energy Eg [J / s] for sending air into the fillers 16 and 66 and the potential energy El [J / s] given to supply the absorption liquid to the upper surfaces of the fillers 16 and 66. They are determined by the following formulas (2) and (3), respectively. Eg = Vg×H×W×dP×L ······ (2) El = Vl×W×L×η×ρ×g×H ··· (3)

[0056] In Equation (2), Vg is the air velocity (1.4 [m / s]) upstream of the packing materials 16 and 66, H is the height [m] of the packing materials 16 and 66, W is the width (width in the stacking direction of the porous body) [m] of the packing materials 16 and 66, dP is the pressure loss [Pa / m] per air passage distance, and L is the distance [m] in the air passage direction.

[0057] In Equation (3), Vl is the flow-down velocity (1.8 [mm / s]) of the absorption liquid in the porous bodies 20 and 70, η is the volume ratio [-] of the porous body in the packing material, ρ is the density (1.1 [g / cm 3 ) of the absorption liquid, and g is the gravitational acceleration (9.8 [m / s 2 ). Then, the energy consumption E [GJ / t] is determined by the following Equation (4). E = (Eg + El) / (Q×H×W×L) ······ (4)

[0058] For the case of the packing material 66 according to the comparative form, it is assumed that the carbon dioxide concentration Cg in the air is uniform, and it is set to 0.0166 [mol / m 3 corresponding to 400 [ppm].

[0059] On the other hand, for the case of the packing material 16 according to the present embodiment, at the gas-liquid interface in contact with the main air flow path 22, the carbon dioxide concentration Cg is set to 0.0166 [mol / m 3 , and at the gas-liquid interface in contact with the sub-flow path 26, the concentration decrease due to absorption is considered. That is, the carbon dioxide concentration Cg is set to the steady-state concentration at which the consumption due to the absorption of carbon dioxide and the supply due to diffusion are in equilibrium at the gas-liquid interface in contact with the sub-flow path 26 of the air.

[0060] Also, the diffusion coefficient D of carbon dioxide is 16 [mm 2It was set as ` / s`. Further, the pressure loss dP was calculated assuming Poiseuille flow between the flat plates. In this way, since the recovery rate Q and the energy consumption E were calculated with conditions other than the structure being equal, the recovery rate Q and the energy consumption E between the packing structures can be compared between the packing 16 and the packing 66.

[0061] Figure 7(A) graphically shows 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 form. The vertical axis of the graph shown in Figure 7(A) indicates the energy consumption E [GJ / t], and the horizontal axis indicates the carbon dioxide recovery rate Q [t / m 3 / year]. And ● in the graph indicates the calculation result of the packing 66, and 〇 in the graph indicates the calculation result of the packing 16.

[0062] In this calculation, the thickness tsp of the porous body 70 of the packing 66 was set to 1 [mm], and the gap gap between adjacent porous bodies 70 was set to 2.7 [mm] or more and 8.2 [mm] or less.

[0063] On the other hand, the thickness tsp of the porous body 20 of the packing 16 was set to 7 [mm], and the gap gap between adjacent porous bodies 20 was set to 8 [mm] or more and 40 [mm] or less. Further, the pore diameter d of the circular hole 20a was set to 1 [mm], and the pore pitch P of the circular hole 20a was set to 1.5 [mm].

[0064] From the graph shown in Figure 7(A), it can be seen that for the packing 16, the recovery performance of recovering carbon dioxide from air is improved because the energy consumption is smaller than that of the packing 66. Regarding □ in the graph shown in Figure 7(A), it will be described later.

[0065] In this way, in the porous body 20, the circular holes 20a of the porous body 20 are not filled with the absorption liquid, and carbon dioxide contained in the air is supplied to the secondary flow path 26 formed by the circular holes 20a, so that a gas-liquid interface is formed inside the porous body 20 (inside the porous body plate (sheet)). Therefore, in the porous body 20, compared with the porous body 70 in which all the internal pores are filled with the absorption liquid, the gas-liquid interface area increases, thereby improving the recovery performance.

[0066] 〔Influence of each parameter on the recovery performance〕 Next, in order to confirm the influence of each parameter of the filler 16 on the carbon dioxide recovery performance, a plurality of values are set for each parameter value, and the relationship between the energy consumption E [GJ / t] and the carbon dioxide recovery rate Q [t / m 3 / year] is calculated.

[0067] In FIG. 7(B), the influence of each parameter of the filler 16 on the carbon dioxide recovery performance is shown in a graph. The vertical axis of the graph shown in FIG. 7(B) represents the energy consumption E [GJ / t], and the horizontal axis represents the carbon dioxide recovery rate Q [t / m 3 / year]. The □ in the graph indicates the case where a plurality of values of the thickness tsp are set, the 〇 in the graph indicates the case where a plurality of values of the gap gap are set, and the △ in the graph indicates the case where a plurality of values of the pore diameter d of the circular hole 20a are set. The pore pitch P was 1.5 times the pore diameter d.

[0068] When a plurality of values of the thickness tsp are set, the thickness tsp is set to a plurality of values from 1 [mm] to 18 [mm], the gap gap is set to a constant value of 12 [mm], and the pore diameter d is set to a constant value of 1 [mm].

[0069] Also, when a plurality of values of the gap gap are set, the gap gap is set to a plurality of values from 7 [mm] to 30 [mm], the thickness tsp is set to a constant value of 7 [mm], and the pore diameter d is set to a constant value of 1 [mm].

[0070] Furthermore, when determining a plurality of values for the pore diameter d, the pore diameter d was set to a plurality of values of 0.6 [mm] or more and 2 [mm] or less, the thickness tsp was set to a constant value of 7 [mm], and the gap gap was set to a constant value of 12 [mm].

[0071] As shown in the graph of FIG. 7(B), when determining a plurality of values for the gap gap, the energy consumption increases as the recovery rate improves. That is, there is a trade-off between improving the recovery rate and reducing the energy consumption. Also, regarding the pore diameter d, the smaller the pore diameter d, the better the recovery performance.

[0072] On the other hand, regarding the thickness tsp, there is a suitable range in which the recovery performance improves, and it is preferably 4 [mm] or more and 10 [mm] or less.

[0073] 〔Regarding Index C1〕 Next, the relationship between the index C1 shown by the following formula (5) and the recovery rate Q [t / m3 / year] is calculated. As described above, there is a suitable range for the thickness tsp. Therefore, when calculating the index C1, a plurality of values for the thickness tsp were determined. JPEG2025095396000006.jpg1181

[0074] The vertical axis of the graph shown in FIG. 8 indicates the recovery rate Q, and the horizontal axis indicates the index C1. In the graph, the cases of pore diameters d of 0.1 [mm], 0.3 [mm], and 1 [mm] are respectively shown.

[0075] Also, regarding the carbon dioxide transfer coefficient K for calculating the index C1, it was set to 0.24 [mm / s], and regarding the diffusion coefficient D, it was set to 16 [mm 2 / s]. Furthermore, regarding the gap gap, it was set to 10 [mm], and the pore pitch P was set to 1.5 times the pore diameter d. That is, for each parameter other than the thickness tsp, a constant value was set.

[0076] As shown in the graph of FIG. 8, in order to effectively recover carbon dioxide from air, for the index C1, it is preferably 0.005 or more and 5 or less. More preferably, it is 0.02 or more and 2 or less, and most preferably, it is 0.06 or more and 0.6 or less. By using this index C1, it is possible to obtain an appropriate thickness tsp even when the pore diameter d to be processed, the absorption liquid, and the gas to be recovered are different. Note that the parameters of the filler 16 of the first embodiment are determined so that the index C1 is 0.005 or more and 5 or less.

[0077] Furthermore, FIGS. 9(A) and (B) show graphs in which the vertical axis represents the recovery rate Q and the horizontal axis represents the index C1. In the graph, the cases where the pore diameter d is 0.1 [mm], 0.3 [mm], and 1 [mm] are respectively shown. Note that the graphs in FIGS. 9(A) and (B) will mainly describe the parts different from the graph in FIG. 8.

[0078] In the graph of FIG. 9(A), the movement coefficient K is set to 2 to calculate the index C1, and in the graph of FIG. 9(B), the movement coefficient K is set to 0.03 to calculate the index C1.

[0079] As shown in the graphs of FIGS. 9(A) and (B), even when the value of the movement coefficient K is changed, for the index C1, it is preferably 0.005 or more and 5 or less in order to effectively recover carbon dioxide from air. More preferably, it is 0.02 or more and 2 or less, and most preferably, it is 0.06 or more and 0.6 or less. Thus, the preferable range is the same as the graph shown in FIG. 8.

[0080] Furthermore, FIGS. 10(A) and (B) show graphs in which the vertical axis represents the recovery rate Q and the horizontal axis represents the index C1. In the graph, the cases where the pore diameter d is 0.1 [mm], 0.3 [mm], and 1 [mm] are respectively shown. Note that the graphs in FIGS. 10(A) and (B) will mainly describe the parts different from the graph in FIG. 8.

[0081] In the graph of Fig. 10(A), in order to calculate the index C1, the gap was set to 5 [mm], and in the graph of Fig. 10(B), in order to calculate the index C1, the gap was set to 20 [mm].

[0082] As shown in the graphs of Figs. 10(A) and (B), even when the value of the gap is changed, in order to effectively recover carbon dioxide from the air, for the index C1, it 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. Thus, the preferred range is the same as the graph shown in Fig. 8.

[0083] Furthermore, in Figs. 11(A) and (B), there are graphs in which the vertical axis represents the recovery rate Q and the horizontal axis represents the index C1. In the graphs, the cases where the pore diameter d is 0.1 [mm], 0.3 [mm], and 1 [mm] are shown respectively. The graphs of Figs. 11(A) and (B) will mainly explain the parts different from the graph of Fig. 8.

[0084] In the graph of Fig. 11(A), in order to calculate the index C1, the diffusion coefficient D was set to 8 [mm 2 / s], and in the graph of Fig. 11(B), in order to calculate the index C1, the diffusion coefficient D was set to 32 [mm2 / s].

[0085] As shown in the graphs of Figs. 11(A) and (B), even when the value of the diffusion coefficient D is changed, in order to effectively recover carbon dioxide from the air, for the index C1, it 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. Thus, the preferred range is the same as the graph shown in Fig. 8.

[0086] Furthermore, in Figs. 12(A) and (B), there are graphs in which the vertical axis represents the recovery rate Q and the horizontal axis represents the index C1. In the graphs, the cases where the pore diameter d is 0.1 [mm], 0.3 [mm], and 1 [mm] are shown respectively. The graphs of Figs. 12(A) and (B) will mainly explain the parts different from the graph of Fig. 8.

[0087] In the graph of FIG. 12(A), in order to calculate the index C1, the hole pitch P was set to 1.1 times the hole diameter d, and in the graph of FIG. 12(B), in order to calculate the index C1, the hole pitch P was set to 2 times the hole diameter d.

[0088] As shown in the graphs of FIGS. 12(A) and (B), even when the value of the hole pitch P is changed, in order to effectively recover carbon dioxide from the air, for the index C1, it is preferably 0.005 or more and 5 or less. More preferably, it is 0.02 or more and 2 or less, and most preferably, it is 0.06 or more and 0.6 or less. Thus, the preferable range is the same as the graph shown in FIG. 8.

[0089] Here, in the calculation of the recovery rate Q and the energy consumption E, it is assumed that the pores of the porous body 20 are filled with the absorbent liquid, and the absorbent liquid leaks from the circular holes 20a to form the air bypass channel 26. This is the case where the hole diameter d of the circular holes 20a formed in the porous body 20 is sufficiently larger than the pore diameter of the pores of the porous body 20 (hereinafter referred to as "pore diameter").

[0090] On the other hand, when the pore diameter of the porous body 20 and the hole diameter d of the circular holes 20a formed in the porous body 20 are of the same degree, the capillary force of the absorbent liquid in the bypass channel 26 formed by the pores and the circular holes 20a of the porous body 20 becomes of the same degree. For this reason, there is a possibility that a part of the pores and the bypass channel 26 are filled with the absorbent liquid and a part contains air. That is, the structure of the liquid flow path through which the absorbent liquid flows and the bypass channel through which carbon dioxide contained in the air diffuses is different from the structure assumed in the calculation of the recovery rate Q and the energy consumption E. Therefore, the hole diameter d of the circular holes 20a formed in the porous body 20 needs to be sufficiently larger than the pore diameter of the porous body 20.

[0091] Note that the measurement methods of the pore diameter include observation by a microscope and measurement by mercury intrusion method. In addition, as the reference value of the pore diameter of the porous body 20, the median value based on volume can be used. Instead of the median value, it may be based on the percentile rank other than 50, or may be the average value. The width of the bypass channel 26 is preferably 1.5 times or more the reference value of the pore diameter of the porous body 20.

[0092] (Summary) As described above, a plurality of circular holes 20a penetrating through the front and back surfaces are formed in a staggered pattern in the porous body 20 of the filler 16. As a result, the gas-liquid interface between the air and the absorption liquid flowing inside the porous body can be increased as compared with the case where the gas-liquid interface is limited to the outer surface of the porous body (in the case of the filler 66 according to the comparative form).

[0093] Also, a plurality of circular holes 20a penetrating through the front and back surfaces are formed in a staggered pattern in the porous body 20 of the filler 16. As a result, carbon dioxide contained in the air flowing through the main flow path 22 is supplied to the sub-flow path 26 by diffusion from both sides of the sub-flow path 26 formed by the circular holes 20a, and carbon dioxide changes from the gas phase to the liquid phase and is absorbed from the inner peripheral surface of the circular holes 20a forming the sub-flow path 26. Therefore, in the filler 16, the carbon dioxide recovery performance can be improved as compared with the filler 66 according to the comparative form.

[0094] Also, the index C1 of the filler 16 is set to be 0.005 or more and 5 or less. Therefore, in the filler 16, the carbon dioxide recovery performance can be improved as compared with the case where the index C1 is small or large with respect to this range.

[0095] Also, the gas-liquid contact device 10 includes the filler 16. Therefore, the energy consumption of the fan 24 for transferring air and the pump for transferring the absorption liquid can be reduced as compared with the case of including the filler 66.

[0096] <Second Embodiment> Next, an example of a filler for gas-liquid contact and a gas-liquid contact device according to the second embodiment will be described with reference to FIGS. 13 to 16. Note that, for the second embodiment, the parts different from the first embodiment will be mainly described.

[0097] (Main Component Configuration) In the porous body 120 provided in the filler 116 according to the second embodiment, as shown in FIG. 13, a plurality of slits 120a are formed at predetermined intervals side by side in the width direction, penetrating the porous body 120 in the depth direction intersecting the width direction and extending in the vertical direction. In other words, the porous body 120 is provided with a plurality of rectangular parallelepiped porous portions 124 that are divided by the slits 120a and extend in the vertical direction, arranged side by side in the width direction.

[0098] Then, as shown in FIG. 14, the gap between a pair of adjacent porous bodies 120 in the depth direction is the main flow path 22, and the gap between a pair of adjacent porous portions 124 in the width direction formed by the slit 120a is the sub-flow path 126.

[0099] In the second embodiment, as shown in FIG. 14, the thickness of the porous body 120 is tsp, and the gap between adjacent porous bodies 120 is gap. Further, the thickness in the width direction of the porous portion 124 is Lwall, and the gap between a pair of adjacent porous portions 124 in the width direction formed by the slit 120a is Lgap.

[0100] 〔Comparison of Recovery Performance〕 Next, the recovery performance when recovering carbon dioxide in the air using the filler 116 is calculated by calculation. The calculation method was the same as that of the filler 16 according to the first embodiment.

[0101] In this calculation, the thickness tsp of the porous body 120 of the filler 116 was set to 4 [mm], and the gap gap between adjacent porous bodies 120 was set to 4 [mm] or more and 18 [mm] or less. Further, the thickness Lwall of the porous portion 124 was set to 1 [mm], and the gap Lgap between adjacent porous portions 124 was set to 0.2 [mm].

[0102] The □ in the graph of FIG. 7(A) indicates the recovery performance of the filler 116. As can be seen from the graph shown in FIG. 7(A), it can be seen that the recovery performance of the filler 116 for recovering carbon dioxide from the air is improved as compared with the filler 66 according to the comparative form.

[0103] Influence of Each Parameter on Recovery Performance Next, in order to confirm the influence of each parameter of the filler 116 on the carbon dioxide recovery performance, multiple values are set for the value of each parameter, and the relationship between the energy consumption E [GJ / t] and the carbon dioxide recovery rate Q [t / m 3 / year] is calculated.

[0104] Fig. 15 graphically shows the influence of each parameter of the filler 116 on the carbon dioxide recovery performance. The vertical axis of the graph shown in Fig. 15 represents the energy consumption E [GJ / t], and the horizontal axis represents the carbon dioxide recovery rate Q [t / m 3 / year]. The □ in the graph indicates the case where multiple values are set for the value of the thickness tsp, the 〇 in the graph indicates the case where multiple values are set for the value of the gap gap, the △ in the graph indicates the case where multiple values are set for the value of the thickness Lwall, and the ◇ in the graph indicates the case where multiple values are set for the value of the gap Lgap.

[0105] When multiple values are set for the value of the thickness tsp, the thickness tsp is set as multiple values from 1 [mm] to 8 [mm], the gap gap is set as a constant value of 12 [mm], the thickness Lwall is set as a constant value of 1 [mm], and the gap Lgap is set as a constant value of 0.2 [mm].

[0106] When multiple values are set for the value of the gap gap, the gap gap is set as multiple values from 7 [mm] to 20 [mm], the thickness tsp is set as a constant value of 4 [mm], the thickness Lwall is set as a constant value of 1 [mm], and the gap Lgap is set as a constant value of 0.2 [mm].

[0107] When multiple values are set for the value of the thickness Lwall, the thickness Lwall is set as multiple values from 0.5 [mm] to 2.5 [mm], the thickness tsp is set as a constant value of 4 [mm], the gap gap is set as a constant value of 12 [mm], and the gap Lgap is set as a constant value of 0.2 [mm].

[0108] When determining multiple values for the gap Lgap, the gap Lgap was set to multiple values of 0.05 [mm] or more and 1 [mm] or less, the thickness tsp was set to a constant value of 4 [mm], the gap gap was set to a constant value of 12 [mm], and the thickness Lwall was set to a constant value of 1 [mm].

[0109] As shown in the graph of Fig. 15, when determining multiple values for the gap gap, the energy consumption increases along with the improvement of the recovery speed. That is, there is a trade-off between the improvement of the recovery speed and the reduction of the energy consumption. Regarding the thickness Lwall, the smaller the thickness Lwall, the better the recovery performance. However, if the thickness Lwall is too small, problems such as an increase in manufacturing difficulty and a decrease in rigidity may be considered.

[0110] On the other hand, for the thickness tsp, there is a suitable range in which the recovery performance improves, and it is preferably 2 [mm] or more and 6 [mm] or less. Also, for the gap Lgap, there is a suitable range in which the recovery performance improves, and it is preferably 0.15 [mm] or more and 0.4 [mm] or less. This is because when the width of the sub-channel 126 is wide and the length of the sub-channel 126 is short, the number of wall surfaces forming the sub-channel 126 decreases, and when the width of the sub-channel 126 is narrow and the length of the sub-channel 126 is long, the concentration of carbon dioxide in the sub-channel 126 decreases.

[0111] 〔Regarding index C2〕 Next, the relationship between the index C2 represented by the following formula (6) and the recovery speed Q [t / m3 / year] is calculated. As described above, for the thickness tsp, there is a suitable range in which the recovery performance improves. Therefore, when calculating the index C2, multiple values of the thickness tsp were determined. JPEG2025095396000007.jpg1189

[0112] The vertical axis of the graph shown in Fig. 16 represents the recovery speed Q, and the horizontal axis represents the index C2. In the graph, the cases where Lwall is 0.1 [mm], 0.3 [mm], and 1 [mm] are shown respectively.

[0113] Also, regarding the carbon dioxide transfer coefficient K for calculating the index C2, it was set to 0.24 [mm / s], and regarding the diffusion coefficient D, it was set to 16 [mm 2 / s]. Further, regarding the gap gap, it was set to 10 [mm], and regarding the gap Lgap, it was set to 1 [mm]. That is, for each parameter other than the thickness tsp, a constant value was set.

[0114] In this second embodiment, as shown in the graph of FIG. 16, in order to effectively recover carbon dioxide from the air, the index C2 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. By using this index C2, it is possible to obtain an appropriate thickness tsp even when the processable thickness Lwall, the absorbent liquid, and the gas to be recovered are different. Note that the parameters of the filler 116 of the second embodiment are determined so that the index C2 is 0.005 or more and 5 or less.

[0115] (Summary) As described above, in the filler 116, the gap between the pair of porous bodies 120 adjacent in the depth direction is the main flow path 22, and the gap between the pair of porous portions 124 adjacent in the width direction formed by the slit 120a is the sub-flow path 126. As a result, compared with the case where the gas-liquid interface between the air and the absorbent liquid flowing inside the porous body is limited to the outer surface of the porous body (the case of the filler 66 according to the comparative form), the gas-liquid interface between the air and the absorbent liquid flowing inside the porous body 120 can be increased.

[0116] Also, in the filler 116, the gap between the pair of porous portions 124 adjacent in the width direction is the sub-flow path 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 at the wall surface (formed surface) of the slit 120a forming the sub-flow path 126, the carbon dioxide contacts and is absorbed by the absorbent liquid that penetrates and flows through the porous body. Therefore, in the filler 116, the carbon dioxide recovery performance can be improved compared with the filler 66 according to the comparative form.

[0117] Also, with respect to the index C2 of the filler 116, it is set to be 0.005 or more and 5 or less. Therefore, in the filler 116, when the index C2 is small or large with respect to this range, the carbon dioxide recovery performance can be improved as compared with the case where it is within this range.

[0118] (Others) In the first embodiment, the pore diameter d of the circular pores 20a in the porous body 20, and twice the gap Lgap in the porous body 120 in the second embodiment are the hydraulic diameters DH of the circular pores 20a or the slits 120a. The following formula (7) represents the ratio of the inflow due to the diffusion of carbon dioxide into the sub-channel to the consumption due to absorption. JPEG2025095396000008.jpg1138

[0119] Therefore, in general for the sub-channel, with respect to the index C3 represented by the following formula (8), similarly to the aforementioned indices C1 and C2, it 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. JPEG2025095396000009.jpg1185

[0120] In the first embodiment, the pore diameter d of the circular pores 20a in the porous body 20, and twice the gap Lgap in the porous body 120 in the second embodiment are the hydraulic diameters DH of the circular pores 20a or the slits 120a. Further, when the sub-channel penetrates, the gas diffusion distance in the sub-channel is tsp / 2, and when one side of the sub-channel is blocked, the diffusion distance is equal to the depth Lhole of the sub-channel. Therefore, the following formula (9) obtained by substituting tsp with 2Lhole represents the ratio of the inflow due to the diffusion of carbon dioxide into the sub-channel to the consumption due to absorption. JPEG2025095396000010.jpg1144

[0121] Therefore, in general for the sub-channel, with respect to the index C4 represented by the following formula (10), similarly to the aforementioned indices C1 and C2, it 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. JPEG2025095396000011.jpg1195

[0122] <Third Embodiment> Next, an example of a packing for gas-liquid contact and a gas-liquid contact device according to the third embodiment will be described with reference to FIG. 17. For the third embodiment, the parts different from the first embodiment will be mainly described.

[0123] The porous body 170 provided in the packing 166 according to the third embodiment has a small bubble region 170a formed of relatively small pores and a large bubble region 170b formed of relatively large pores. Specifically, the small bubble region 170a and the large bubble region 170b are alternately arranged in the width direction. And the large bubble region 170b faces both plate surfaces of the porous body 170. In the present embodiment, in the porous body 170, the bubble diameter (pore diameter) at the 80th percentile is set to be 2 times or more with respect to the bubble diameter at the 20th percentile.

[0124] In this configuration, the large bubble region 170b serves as the sub-channel 176, and carbon dioxide contained in the air flowing through the main channel 22 from both sides of the sub-channel 176 is supplied by diffusion. Then, at the interface between the large bubble region 170b and the small bubble region 170a forming the sub-channel 176, carbon dioxide penetrates into the small bubble region 170a and contacts the absorbing liquid flowing therein and is absorbed.

[0125] That is, in the case of the porous body 170 having the small bubble region 170a and the large bubble region 170b, the large bubble region 170b in which the pores are relatively large in the porous body 170 has a weaker capillary force than the small bubble region 170a in which the pores are relatively small. For this reason, it is difficult to hold the absorbing liquid and air easily enters. In this way, the boundary between the large bubble region 170b and the small bubble region 170a forms a gas-liquid interface inside the porous body 170. As a result, compared with the case where 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 form), the gas-liquid interface between the air and the absorbing liquid flowing inside the porous body 170 can be increased.

[0126] Also, similar to the filler 16 according to the first embodiment and the filler 116 according to the second embodiment, the filler 166 can improve the carbon dioxide recovery performance as compared with the filler 66 according to the comparative form.

[0127] <Fourth Embodiment> Next, an example of a filler for gas-liquid contact and a gas-liquid contact device according to the fourth embodiment will be described with reference to FIG. 18. Note that for the fourth embodiment, the parts different from the first embodiment will be mainly described.

[0128] In the porous body 220 provided in the filler 216 according to the fourth embodiment, circular holes 20a are formed, and the inside of the circular holes 20a serves as an auxiliary flow path 26. Further, an auxiliary flow path 228 having one end connected to the auxiliary flow path 26 is formed in the porous body 220. The flow path cross-section of this auxiliary flow path 228 is made smaller than the flow path cross-section of the auxiliary flow path 26.

[0129] In this configuration, in the filler 216, on the inner peripheral surface (formed surface) that forms the auxiliary flow path 26 and the auxiliary flow path 228 formed in the porous body 220, carbon dioxide contacts and is absorbed by the absorbent liquid that penetrates and flows through the porous body, so that the carbon dioxide recovery performance can be improved.

[0130] Although the present disclosure has been described in detail with respect to specific embodiments, it is obvious to those skilled in the art that the present disclosure is not limited to such embodiments, and various other embodiments can be taken within the scope of the present disclosure. For example, each embodiment may be combined within the scope not contrary to the idea of the present disclosure to solve the problems of the present disclosure.

[0131] Also, in the above embodiment, the filler absorbs carbon dioxide contained in the air, but the filler may absorb other specific gases contained in other gases in the air.

[0132] Also, in the above embodiment, both ends of the auxiliary flow path are connected to the main flow path, but only one end of the auxiliary flow path may be connected to the main flow path.

[0133] In the above embodiment, it is assumed that the gas moves by diffusion inside the sub-channel, but there may be a flow inside the sub-channel, that is, a specific gas component may be transported by advection.

[0134] In the first embodiment, the sub-channel 26 is formed by the circular hole 20a, but the sub-channel may be formed by an elliptical hole or a rectangular hole or the like.

[0135] In the first, second, and third embodiments, the indexes C1, C2, and C3 of the packing are 0.005 or more and 5 or less, but values not included in this range may be used. However, in this case, the effects achieved when the indexes C1, C2, and C3 are 0.005 or more and 5 or less are not achieved.

[0136] (((1))) A main channel is formed in which an absorption liquid that absorbs a specific gas permeates and flows, and a gas containing the specific gas flows along the outer surface. The main channel is provided with a porous body formed of a material having a contact angle with the absorption liquid of less than 90 [°]. One end of the porous body is connected to the main channel, and a sub-channel is formed in the porous body, the cross-sectional area of which is smaller than that of the main channel and extends in a direction intersecting the direction in which the main channel extends. A packing for gas-liquid contact.

[0137] (((2))) The porous body is in the form of a plate in which a plurality of cylindrical circular holes extending in the thickness direction and penetrating therethrough are formed, and a plurality of the porous bodies are arranged such that the plate surfaces face in the horizontal direction. A gap between a pair of adjacent porous bodies serves as the main channel extending in the one direction. The sub-channel formed by the circular holes is formed. When the thickness of the plate-like porous body is tsp, the gas transfer coefficient is K, the gas diffusion coefficient is D, the pore diameter of the sub-channel is d, and the gap between the adjacent porous bodies is gap, the value of the 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))). JPEG2025095396000012.jpg1181

[0138] (((3))) 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 slits formed therein at predetermined intervals in the one direction, the slits penetrating the porous body in a direction intersecting the one direction and extending in a vertical direction, the slits being aligned in the one direction, The slit is the secondary flow path, When the thickness of the plate-like porous body is tsp, the gas transfer coefficient is K, the gas diffusion coefficient is D, the gap formed by the slit is Lgap, and the gap between adjacent porous bodies is gap, the value of the 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))). JPEG2025095396000013.jpg1189

[0139] (((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 sub-flow passage is formed in the porous body so as to extend in a thickness direction of the porous body and penetrate the porous body, 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))). JPEG2025095396000014.jpg1185

[0140] ((5)) The porous bodies are plate-shaped, and a plurality of them are arranged such that the plate surfaces face each other in the horizontal direction. The gap between a pair of adjacent porous bodies serves as the main flow path extending in the one direction. In the porous body, a sub-flow path is formed that extends in the thickness direction of the porous body and is closed at one end. Let tsp be the thickness of the plate-shaped porous body, Lhole be the depth of the sub-flow path, K be the gas transfer coefficient, D be the gas diffusion coefficient, and D H be the hydraulic diameter of the sub-flow path, and gap be the gap between adjacent porous bodies. Then, the value of index C4 in the following formula (4) is 0.005 or more and 5 or less. The packing for gas-liquid contact according to ((1)). JPEG2025095396000015.jpg1191

[0141] ((6)) The porous body is plate-shaped and is formed to include a large bubble region formed by a plurality of pores and a small bubble region formed by a plurality of pores smaller than the large bubble region. A plurality of them are arranged such that the plate surfaces face each other in the horizontal direction. The gap between a pair of adjacent porous bodies serves as the main flow path extending in the one direction. The absorption liquid penetrates and flows through the small bubble region formed in the porous body. The large bubble region formed in the porous body serves as the sub-flow path. The packing for gas-liquid contact according to ((1)).

[0142] ((7)) A plurality of the main flow paths extending in the one direction are formed side by side in a crossing direction that intersects the one direction. The sub-flow path is formed so as to connect one adjacent main flow path and the other main flow path. The packing for gas-liquid contact according to any one of ((1)) to ((6)).

[0143] (((8))) An auxiliary flow path with one end connected to the sub-flow path is formed in the porous body. The packing for gas-liquid contact according to any one of ((1)) to ((7)).

[0144] (((9))) The packing for gas-liquid contact according to any one of ((1)) to ((8)), a housing in which the packing for gas-liquid contact is disposed, a fan that flows gas along the outer surface of the porous body provided in the packing, and a gas-liquid contact device including the same.

Explanation of Signs

[0145] 10 Gas-liquid contact device 14 Housing 16 Packing (packing for gas-liquid contact) 20 Porous body 20a Circular hole 22 Main flow path 24 Fan 26 Sub-flow path 116 Packing (packing for gas-liquid contact) 120 Porous body 120a Slit 126 Sub-flow path 166 Packing (packing for gas-liquid contact) 170 Porous body 170a Small bubble region 170b Large bubble region 176 Sub-flow path 216 Packing (packing for gas-liquid contact) 220 Porous body 228 Auxiliary flow path C1 Index C2 Index C3 Index C4 Index D Diffusion coefficient D H Hydraulic diameter K Transfer coefficient Lgap Gap tsp Thickness P hole pitch gap clearance

Claims

1. A main flow path is formed through which an absorption liquid that absorbs a specific gas permeates and flows, and a gas containing the specific gas flows along the outer surface. The main flow path is provided with a porous body formed of a material having a contact angle of less than 90° with the absorption liquid. In the porous body, a sub-flow path is formed such that one end is connected to the main flow path, the cross-sectional area of the flow path is smaller than that of the main flow path, and the sub-flow path extends in a direction intersecting the direction in which the main flow path extends. A packing for gas-liquid contact.

2. The porous body is in a plate shape with a plurality of columnar circular holes formed therethrough and extending in the thickness direction, and a plurality of the porous bodies are arranged such that the plate surfaces face each other in the horizontal direction. A gap between a pair of adjacent porous bodies serves as the main flow path extending in the one direction. The sub-flow path is formed by the circular holes. When the thickness of the plate-shaped porous body is tsp, the gas transfer coefficient is K, the gas diffusion coefficient is D, the pore diameter of the sub-flow path is d, and the gap between adjacent porous bodies is gap, the value of the index C1 in the following formula (1) is 0.005 or more and 5 or less. The packing for gas-liquid contact according to Claim 1.

3. The porous body is in a plate shape, and a plurality of the porous bodies are arranged such that the plate surfaces face each other in the horizontal direction. A gap between a pair of adjacent porous bodies serves as the main flow path extending in the one direction. In the porous body, a plurality of slits are formed in a row in the one direction at a predetermined interval, penetrating the porous body in a crossing direction intersecting the one direction and extending in the vertical direction. The slits serve as the sub-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 gap formed by the slits is Lgap, and the gap between adjacent porous bodies is gap, the value of the index C2 in the following formula (2) is 0.005 or more and 5 or less. The packing for gas-liquid contact according to Claim 1.

4. The porous body is in a plate shape, and a plurality of the porous bodies are arranged such that the plate surfaces face each other in the horizontal direction. A gap between a pair of adjacent porous bodies serves as the main flow path extending in the one direction. In the porous body, the sub-flow path extending through the porous body in the thickness direction is formed. Let the thickness of the plate-shaped porous body be tsp, the gas transfer coefficient be K, the gas diffusion coefficient be D, and the hydraulic diameter of the secondary flow path be D Ｈ and the gap between adjacent porous bodies be gap. Then, the value of the index C3 in the following formula (3) is 0.005 or more and 5 or less, The packing for gas-liquid contact according to Claim 1.

5. The porous body is in a plate shape, and a plurality of the porous bodies are arranged such that the plate surfaces face each other in the horizontal direction. A gap between a pair of adjacent porous bodies serves as the main flow path extending in the one direction. In the porous body, there is formed the auxiliary flow path that extends in the thickness direction of the porous body and has one end closed. Let the thickness of the plate-like porous body be tsp, the depth of the sub-channel be Lhole, the gas transfer coefficient be K, the gas diffusion coefficient be D, and the hydraulic diameter of the sub-channel be D Ｈ and when the gap between adjacent porous bodies is gap, the value of the index C4 in the following formula (4) is 0.005 or more and 5 or less, The packing for gas-liquid contact according to claim 1.

6. The porous body is plate-shaped and is formed to include a large bubble region formed by a plurality of pores and a small bubble region formed by a plurality of pores smaller than the large bubble region, and a plurality of them are arranged such that the plate surfaces face each other in the horizontal direction. The gap between a pair of adjacent porous bodies is the main flow path extending in the one direction. The absorbent liquid penetrates and flows in the small bubble region formed in the porous body. The large bubble region formed in the porous body is the auxiliary flow path. The packing for gas-liquid contact according to claim 1.

7. A plurality of the main flow paths extending in the one direction are formed side by side in an intersecting direction intersecting the one direction. The auxiliary flow path is formed so as to connect one adjacent main flow path and the other main flow path. The packing for gas-liquid contact according to claim 1.

8. In the porous body, there is formed an auxiliary flow path having one end connected to the auxiliary flow path. The packing for gas-liquid contact according to claim 1.

9. The packing for gas-liquid contact according to any one of claims 1 to 8, a housing in which the packing for gas-liquid contact is disposed inside, a fan that causes a gas to flow along the outer surface of the porous body provided in the packing, and a gas-liquid contact device comprising the same.

Images