Gas separation membrane module and gas separation apparatus

Abstract

To provide a gas separation membrane module and a gas separation apparatus that can improve reliability. [Solution] The gas separation membrane module is a spiral-type gas separation membrane module and comprises an element 120 around which leaves 121 having a gas separation membrane 122 that selectively permeates a predetermined gas are wound, wherein the length of the edge of the leaf closer to the gas inlet is longer than the length of the edge of the leaf closer to the gas outlet.

Description

【Technical Field】 【0001】 The present invention relates to a gas separation membrane module and a gas separation apparatus. 【Background Art】 【0002】 Patent Document 1 discloses a gas separation apparatus including a separation membrane module having at least one gas separation membrane element in a housing and a casing that houses the separation membrane module. 【Prior Art Documents】 【Patent Documents】 【0003】 【Patent Document 1】 Japanese Patent Application Laid-Open No. 2019-84497 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0004】 In the gas separation apparatus (separation membrane module) disclosed in Patent Document 1 above, the gas separation membrane element includes a wound body in which a laminate obtained by laminating a supply-side flow path member, a gas separation membrane, and a permeation-side flow path member is wound around a central tube, and a raw material gas flows through the gas separation membrane element. In such a gas separation apparatus (separation membrane module), the inventor of the present application has found that the following problems may occur. When the raw material gas flows from the gas inlet to the gas outlet of the gas separation membrane element and when it flows from the outer peripheral portion to the center of the gas separation membrane element, the pressure loss may increase. If the pressure loss is large, there is a risk that a sufficient amount of gas cannot be supplied to the gas separation membrane or that the gas that has permeated through the gas separation membrane cannot be successfully discharged from the gas separation membrane element. There may be a portion where the gas separation membrane cannot be effectively used near the gas outlet of the gas separation membrane element and near the outer peripheral portion of the gas separation membrane element. If there is a portion where the gas separation membrane cannot be effectively used, the gas separation performance per membrane area will decrease. A configuration that can suppress the occurrence of these problems and improve reliability is desired. 【0005】 This invention was made by the present inventors by newly focusing on the above-mentioned problems, and aims to provide a gas separation membrane module and a gas separation apparatus that can improve reliability. [Means for solving the problem] 【0006】 A gas separation membrane module according to one aspect of the present invention is a spiral-type gas separation membrane module comprising an element around which a leaf is wound, the leaf having a gas separation membrane that selectively permeates a predetermined gas, and the length of the edge of the leaf closest to the gas inlet is longer than the length of the edge of the leaf closest to the gas outlet. 【0007】 A gas separation apparatus according to one aspect of the present invention comprises a first gas separation membrane module and a second gas separation membrane module, which are two spiral-shaped gas separation membrane modules. The first gas separation membrane module comprises a first element around which a first leaf, which is equipped with a first gas separation membrane, is wound, and the length of the edge of the first leaf closest to the gas inlet is longer than the length of the edge of the first leaf closest to the gas outlet. The second gas separation membrane module comprises a second element around which a second leaf, which is equipped with a second gas separation membrane, is wound, and the length of the edge of the second leaf closest to the gas inlet is longer than the length of the edge of the second leaf closest to the gas outlet. The first element and the second element are arranged with their gas inlets and gas outlets in opposite directions. [Effects of the Invention] 【0008】 The gas separation membrane module and the like in the present invention can improve reliability. [Brief explanation of the drawing] 【0009】 [Figure 1] Figure 1 is a perspective view showing the schematic configuration of a gas separation apparatus according to an embodiment. [Figure 2] Figure 2 is a front view and a top view showing the schematic configuration of a gas separation apparatus according to an embodiment. [Figure 3]Figure 3 is a perspective view showing the configuration of a gas separation membrane module according to an embodiment. [Figure 4] Figure 4 is a perspective view showing the configuration of the elements and gas flow tubes of a gas separation membrane module according to an embodiment. [Figure 5] Figure 5 is a plan view and a cross-sectional view showing the configuration of the leaves provided by the element according to the embodiment. [Figure 6] Figure 6 is a cross-sectional view showing a cross-section of a gas separation membrane module according to an embodiment. [Figure 7] Figure 7 is a perspective view showing the configuration of the first gas separation membrane module and the second gas separation membrane module according to the embodiment. [Figure 8] Figure 8 is a perspective view showing the configuration of a gas separation membrane module according to a modified example 1 of the embodiment. [Modes for carrying out the invention] 【0010】 (1) A gas separation membrane module according to one aspect of the present invention is a spiral-type gas separation membrane module comprising an element around which a leaf is wound, the leaf having a gas separation membrane that selectively permeates a predetermined gas, and the length of the edge of the leaf closest to the gas inlet is longer than the length of the edge of the leaf closest to the gas outlet. 【0011】 According to one embodiment of the present invention, a gas separation membrane module comprises an element around which leaves equipped with a gas separation membrane are wound, and the length of the edge of the leaf near the gas inlet is longer than the length of the edge of the leaf near the gas outlet. In other words, the length of the edge of the leaf near the gas outlet is shorter than the length of the edge of the leaf near the gas inlet. By shortening the length of the edge of the leaf near the gas outlet in this way, the membrane area of ​​the gas separation membrane is reduced, so the gas flow rate supplied to the element is reduced, and the pressure loss near the gas inlet of the element can be reduced. Near the gas outlet of the leaf, the gas flow path from the outer periphery to the center of the element is shortened, so the pressure loss can be reduced when the gas flows from the outer periphery to the center of the element. By shortening the length of the edge of the leaf near the gas outlet, the portion of the gas separation membrane near the gas outlet and outer periphery of the element that cannot be effectively used can be cut off, so the gas separation performance (permeability, selectivity) per unit area of ​​the gas separation membrane can be improved. Since the membrane area of ​​the gas separation membrane is reduced, it also contributes to cost reduction. As a result, the reliability can be improved with this gas separation membrane module. 【0012】 (2) In the gas separation membrane module described in (1) above, the gas separation membrane may be configured to selectively permeate carbon dioxide. 【0013】 According to the gas separation membrane module described in (2) above, the gas separation membrane selectively permeates carbon dioxide, thereby separating the supplied gas into a gas with a high carbon dioxide concentration (permeated gas) and a gas with a low carbon dioxide concentration (unpermeated gas). This allows for the recovery of the desired gas from both the gas with a high carbon dioxide concentration (permeated gas) and the gas with a low carbon dioxide concentration (unpermeated gas). 【0014】 (3) In the gas separation membrane module described in (1) or (2) above, the width of the leaf may decrease from the edge closer to the gas inlet to the edge closer to the gas outlet. 【0015】 According to the gas separation membrane module described in the above (3), in the leaf, by making the width smaller from the edge near the gas inlet toward the edge near the gas outlet, the above-described effects of reducing the pressure loss and improving the gas separation performance can be more effectively achieved. 【0016】 (4) In the gas separation membrane module according to any one of the above (1) to (3), the area of the end face of the element near the gas inlet may be larger than the area of the end face of the element near the gas outlet. 【0017】 According to the gas separation membrane module described in the above (4), in the element, by making the area of the end face near the gas inlet larger than the area of the end face near the gas outlet, an element of such a shape can be easily formed. That is, by winding a leaf in which the length of the edge near the gas inlet is longer than the length of the edge near the gas outlet, an element in which the area of the end face near the gas inlet is larger than the area of the end face near the gas outlet can be formed. Therefore, an element of such a shape can be easily formed. 【0018】 (5) In the gas separation membrane module according to the above (4), the element may be frustum-shaped. 【0019】 According to the gas separation membrane module described in the above (5), by making the element frustum-shaped, an element of such a shape can be easily formed. That is, by winding a leaf in which the length of the edge near the gas inlet is longer than the length of the edge near the gas outlet, a frustum-shaped element can be easily formed. 【0020】 (6) The gas separation membrane module according to any one of the above (1) to (5) further includes a gas flow path pipe disposed in the element through which the permeated gas that has permeated through the gas separation membrane flows, and the opening area of the end face of the gas flow path pipe near the gas inlet of the element may be smaller than the opening area of the end face of the gas flow path pipe near the gas outlet of the element. 【0021】 According to the gas separation membrane module described in (6) above, in the gas flow channel tube, the opening area of ​​the end face near the gas inlet is smaller than the opening area of ​​the end face near the gas outlet. As a result, even if a leaf with a length of the edge near the gas inlet longer than the length of the edge near the gas outlet is wound around the gas flow channel tube, it is possible to prevent the outer edge of the end face near the gas inlet of the element from becoming too large, or the outer edge of the end face near the gas outlet of the element from becoming too small. 【0022】 (7) A gas separation apparatus according to one aspect of the present invention comprises a first gas separation membrane module and a second gas separation membrane module, which are two spiral-shaped gas separation membrane modules, wherein the first gas separation membrane module comprises a first element around which a first leaf, which comprises a first gas separation membrane, is wound, and the length of the edge of the first leaf closest to the gas inlet is longer than the length of the edge of the first leaf closest to the gas outlet, and the second gas separation membrane module comprises a second element around which a second leaf, which comprises a second gas separation membrane, is wound, and the length of the edge of the second leaf closest to the gas inlet is longer than the length of the edge of the second leaf closest to the gas outlet, and the first element and the second element are arranged with their gas inlet and gas outlet in opposite directions. 【0023】 According to the gas separation apparatus described in (7) above, in the first gas separation membrane module, the length of the edge of the first leaf near the gas inlet is longer than the length of the edge near the gas outlet, and in the second gas separation membrane module, the length of the edge of the second leaf near the gas inlet is longer than the length of the edge near the gas outlet. As a result, the gas separation apparatus can reduce pressure loss and improve gas separation performance in both the first and second gas separation membrane modules, thereby improving reliability. The first element of the first gas separation membrane module and the second element of the second gas separation membrane module have their gas inlets and gas outlets arranged in opposite directions. By combining gas separation membrane modules facing in opposite directions in this way, multiple gas separation membrane modules can be installed in a narrow space (the number of gas separation membrane modules per unit volume can be increased). The distance between the gas outlet of the first gas separation membrane module and the gas inlet of the second gas separation membrane module can be shortened. Therefore, when supplying gas discharged from the first gas separation membrane module to the second gas separation membrane module, the distance of the piping connecting the first and second gas separation membrane modules can be shortened. Furthermore, when circulating gas through the first and second gas separation membrane modules, the distance between the gas outlet of the second gas separation membrane module and the gas inlet of the first gas separation membrane module can be shortened, thus reducing the length of the connecting piping. Shortening the piping length reduces pressure loss, decreases the amount of piping material used (material cost), and allows for miniaturization and space saving of the gas separation device. 【0024】 Hereinafter, with reference to the drawings, a gas separation membrane module and a gas separation apparatus according to embodiments (including modifications thereof) of the present invention will be described. Note that the embodiments described below are all general or specific examples. The numerical values, shapes, materials, components, arrangement and connection configurations of components, manufacturing processes, and the order of manufacturing processes shown in the following embodiments are examples only and are not intended to limit the present invention. Dimensions in each figure are not precisely illustrated. In each figure, the same or similar components are denoted by the same reference numerals. 【0025】 In the following description and drawings, the direction in which the multiple gas separation membrane modules of the gas separation device are aligned is defined as the X-axis direction or the Y-axis direction. The Z-axis direction is defined as the height direction (vertical direction) of the gas separation membrane module, the longitudinal direction of the gas separation membrane module, the direction in which the gas inlet and gas outlet of the gas separation membrane module are aligned, the longitudinal direction of the elements of the gas separation membrane module, the direction in which the winding axis of the elements extends, or the direction in which the gas flow path pipe extends. These X-axis, Y-axis, and Z-axis directions intersect each other (orthogonal in this embodiment). Depending on the usage, the Z-axis direction may not be the height direction (vertical direction), but for the sake of explanation below, the Z-axis direction will be described as the height direction (vertical direction). 【0026】 In the following explanation, the X-axis positive direction refers to the direction of the X-axis arrow, and the X-axis negative direction refers to the direction opposite to the X-axis positive direction. When simply referred to as the X-axis direction, it refers to either the X-axis positive direction or the X-axis negative direction, or either direction. Unless otherwise specified, the center and ends of a member in the X-axis direction refer to the parts located in the center and ends when the member is divided into three parts in the X-axis direction. The same applies to the Y-axis and Z-axis directions. Expressions indicating relative directions or orientations, such as parallel and orthogonal, include cases where they are not strictly those directions or orientations. Two directions being parallel (or orthogonal) means not only that the two directions are perfectly parallel (or orthogonal), but also that they are substantially parallel (or orthogonal), that is, they may include a difference of, for example, a few percent. 【0027】 (Embodiment) [1. Description of the gas separation device 10] First, the schematic configuration of the gas separation device 10 in this embodiment will be described. Figure 1 is a perspective view showing the schematic configuration of the gas separation device 10 according to this embodiment. Figure 2 is a front view and a top view showing the schematic configuration of the gas separation device 10 according to this embodiment. Figure 2(a) is a view of the configuration shown in Figure 1 from the front (negative Y-axis direction), and Figure 2(b) is a view of the configuration shown in Figure 1 from above (positive Z-axis direction). In Figure 2, the piping 210, 220 and 230 shown in Figure 1 are omitted from the illustration. 【0028】 As shown in Figures 1 and 2, the gas separation device 10 includes a gas separation membrane module 100 and piping 210, 220, and 230. The gas separation device 10 may also include a container (tank) for storing the gas supplied to the gas separation membrane module 100, a blower (fan) for supplying gas to the gas separation membrane module 100, a blower (fan) for sending the gas separated by the gas separation membrane module 100, and a container (tank) for storing the gas separated by the gas separation membrane module 100. 【0029】 The gas separation membrane module 100 is a cross-flow filter that separates gases by flowing the supplied raw gas g1 parallel to the gas separation membrane (gas separation membrane 122, described later) and selectively permeating a predetermined gas through the gas separation membrane. The gas separation membrane module 100 is a spiral-shaped membrane module around which the gas separation membrane is wound. In the gas separation membrane module 100, the raw gas g1 is supplied from the raw gas inlet 111, and the unpermeated gas g2 of the raw gas g1 that did not permeate the gas separation membrane is removed from the unpermeated gas outlet 112 (see Figure 3, etc.). In the gas separation membrane module 100, the permeated gas g3 that has permeated the gas separation membrane is removed from the permeated gas outlet 113. 【0030】 In this embodiment, the gas separation device 10 comprises five gas separation membrane modules 100 arranged in the X-axis and Y-axis directions. Specifically, the gas separation device 10 comprises four first gas separation membrane modules 101 arranged in a ring shape, and one second gas separation membrane module 102 located in the center of the four first gas separation membrane modules 101. The second gas separation membrane module 102 has the same configuration as the first gas separation membrane modules 101, but is arranged in an inverted position compared to the first gas separation membrane modules 101 (see Figure 7, etc.). 【0031】 In this embodiment, the first gas separation membrane module 101 is a frustoconical module in which the area of ​​the lower surface (the surface in the negative Z-axis direction) is larger than the area of ​​the upper surface (the surface in the positive Z-axis direction). The second gas separation membrane module 102 is a frustoconical module in which the area of ​​the upper surface (the surface in the positive Z-axis direction) is larger than the area of ​​the lower surface (the surface in the negative Z-axis direction). The space formed between the four first gas separation membrane modules 101 narrows towards the bottom, and the second gas separation membrane module 102 is inserted into this space. A detailed explanation of the configuration of the gas separation membrane module 100 (first gas separation membrane module 101 and second gas separation membrane module 102) will be given later. 【0032】 Specifically, raw gas g1 is supplied to each gas separation membrane module 100 through the piping 210, from the raw gas inlet 111 provided in each of the gas separation membrane modules 100. In the first gas separation membrane module 101, raw gas g1 is supplied from the raw gas inlet 111 on the bottom surface (the surface in the negative Z-axis direction). In the second gas separation membrane module 102, raw gas g1 is supplied from the raw gas inlet 111 on the top surface (the surface in the positive Z-axis direction). 【0033】 The raw gas g1 is separated by the gas separation membrane module 100, and the unpermeable gas g2 from the raw gas g1 that did not permeate the gas separation membrane is discharged through the piping 220 from the unpermeable gas outlet 112 of the gas separation membrane module 100. In the first gas separation membrane module 101, the unpermeable gas g2 is discharged from the unpermeable gas outlet 112 on the upper surface (plane in the positive Z-axis direction). In the second gas separation membrane module 102, the unpermeable gas g2 is discharged from the unpermeable gas outlet 112 on the lower surface (plane in the negative Z-axis direction). 【0034】 In the gas separation membrane module 100, the permeate gas g3 that has permeated through the gas separation membrane is discharged from the permeate gas outlet 113 of the gas separation membrane module 100 through the piping 230. In the first gas separation membrane module 101, the permeate gas g3 is discharged from the permeate gas outlet 113 on the upper surface (the surface in the positive Z-axis direction). In the second gas separation membrane module 102, the permeate gas g3 is discharged from the permeate gas outlet 113 on the lower surface (the surface in the negative Z-axis direction). 【0035】 In this embodiment, pipes 210, 220, and 230 extend in the X-axis direction or merge (branch), but the direction in which pipes 210, 220, and 230 extend, and whether or not they merge (branch), are not particularly limited. The number and arrangement positions of the gas separation membrane modules 100 (first gas separation membrane module 101 and second gas separation membrane module 102) are also not particularly limited. 【0036】 [2. Description of Gas Separation Membrane Module 100] Next, the configuration of the gas separation membrane module 100 will be described in detail. Since the first gas separation membrane module 101 and the second gas separation membrane module 102 have the same configuration, the configuration of the first gas separation membrane module 101 will be described in detail below, as referred to as the gas separation membrane module 100. 【0037】 Figure 3 is a perspective view showing the configuration of the gas separation membrane module 100 according to this embodiment. Figure 3 is an enlarged perspective view of one gas separation membrane module 100 (first gas separation membrane module 101) shown in Figure 1. In Figure 3, the internal configuration of the gas separation membrane module 100 is shown by dashed lines. Figure 4 is a perspective view showing the configuration of the element 120 and gas flow channel 130 provided in the gas separation membrane module 100 according to this embodiment. Figure 5 is a plan view and a cross-sectional view showing the configuration of the leaf 121 provided in the element 120 according to this embodiment. Figure 5(a) is a plan view showing the configuration when one leaf 121 is unfolded and spread out in a planar shape, and Figure 5(b) is a cross-sectional view showing the cross-section when the leaf 121 is cut in the thickness direction. In Figure 5, the illustration of components other than one leaf 121 and the gas flow channel 130 is omitted. In Figure 5, the illustration of the multiple through holes 131 formed in the gas flow channel 130 is also omitted. Figure 6 is a cross-sectional view showing the cross-section of the gas separation membrane module 100 according to this embodiment. Figure 6 shows a cross-section of the gas separation membrane module 100 shown in Figure 3, when cut by a plane parallel to the XY plane. The gas separation membrane module 100 consists of numerous leaves 121 wound around a gas flow channel pipe 130, but for the sake of explanation, Figure 6 schematically shows a configuration in which two leaves 121 are wound around the gas flow channel pipe 130. 【0038】 As shown in Figure 3, the gas separation membrane module 100 comprises a container 110, an element 120 housed in the container 110, and a gas flow channel pipe 130. 【0039】 [2.1 Description of Container 110] The container 110 is a frustoconical container in which the area of ​​the bottom surface (the surface in the negative Z-axis direction) is larger than the area of ​​the top surface (the surface in the positive Z-axis direction), and a space (cavity) for housing the element 120 and the gas flow channel pipe 130 is formed inside. The material of the container 110 is not particularly limited, but examples of containers 110 include resin containers such as polyvinyl chloride and engineering plastics, or metal containers. A raw gas inlet 111 is formed on the bottom surface (the surface in the negative Z-axis direction) of the container 110, and an unpermeable gas outlet 112 and a permeable gas outlet 113 are formed on the top surface (the surface in the positive Z-axis direction) of the container 110. 【0040】 The raw gas inlet 111 is a circular through-hole that penetrates the lower wall (bottom wall, wall in the negative Z-axis direction) of the container 110 in the Z-axis direction. The raw gas inlet 111 is an opening that serves as the inlet for the raw gas g1 and is connected to the piping 210. The raw gas inlet 111 is positioned opposite the end face 125 of the element 120 in the negative Z-axis direction, and the raw gas g1 flowing into the element 120 passes through it. The raw gas inlet 111 is positioned offset from the center of the lower wall of the container 110 when viewed from the Z-axis direction. The shape of the raw gas inlet 111 is not particularly limited and may be an elliptical, oblong, or polygonal through-hole such as a square. The position and size of the raw gas inlet 111 are also not particularly limited. 【0041】 The impermeable gas outlet 112 is a circular through-hole that penetrates the upper wall (top wall, wall in the positive Z-axis direction) of the container 110 in the Z-axis direction. The impermeable gas outlet 112 is an opening that serves as the outlet for impermeable gas g2 and is connected to the piping 220. The impermeable gas outlet 112 is positioned opposite the Z-axis positive end face 126 of the element 120, and the impermeable gas g2 flowing out from the element 120 passes through it. The impermeable gas outlet 112 is positioned offset from the center of the upper wall of the container 110 when viewed from the Z-axis direction. The shape of the impermeable gas outlet 112 is not particularly limited and may be an elliptical, oblong, or polygonal through-hole such as a square. The position and size of the impermeable gas outlet 112 are also not particularly limited. 【0042】 The permeate gas outlet 113 is a circular through-hole that penetrates the upper wall (top wall, wall in the positive Z-axis direction) of the container 110 in the Z-axis direction. The permeate gas outlet 113 is an opening that serves as the outlet for the permeate gas g3 and is connected to the piping 230. The permeate gas outlet 113 is connected to the gas flow channel pipe 130 inside the container 110, and the permeate gas g3 flowing out from the gas flow channel pipe 130 passes through it. The permeate gas outlet 113 is positioned at the center of the upper wall of the container 110 when viewed from the Z-axis direction. The shape of the permeate gas outlet 113 is not particularly limited and may be an elliptical, oblong, or polygonal through-hole such as a square. The position and size of the permeate gas outlet 113 are also not particularly limited. 【0043】 [2.2 Description of Element 120] As shown in Figures 3 and 4, the element 120 has an end face 125 in the negative Z-axis direction and an end face 126 in the positive Z-axis direction. The end face 125 has a circular outer edge when viewed from the Z-axis direction and has an annular shape with a circular hole at the position of the gas flow channel pipe 130. The same applies to the end face 126. In the element 120, raw gas g1 flows in from the end face 125 in the negative Z-axis direction, and unpermeated gas g2 flows out from the end face 126 in the positive Z-axis direction. Therefore, the end face 125 of the element 120 is the end face closest to the gas inlet of the element 120, and the end face 126 of the element 120 is the end face closest to the gas outlet of the element 120. 【0044】 In this configuration, the element 120 has a shape in which the area S1 of the end face 125 in the negative Z-axis direction is larger than the area S2 of the end face 126 in the positive Z-axis direction. That is, the area S1 of the end face 125 of the element 120 closer to the gas inlet is larger than the area S2 of the end face 126 of the element 120 closer to the gas outlet. When the amount of permeated gas g3 is large and the amount of unpermeated gas g2 is small due to a high concentration of a predetermined gas (carbon dioxide in this embodiment) in the raw gas g1, it is preferable to increase the ratio of area S1 to area S2. On the other hand, when the amount of permeated gas g3 is small and the amount of unpermeated gas g2 is large due to the raw gas g1 being the atmosphere, it is preferable to decrease the ratio of area S1 to area S2. The ratio of area S1 to area S2 can also be appropriately determined by the permeation coefficient of the gas separation membrane 122 and the membrane area of ​​the gas separation membrane 122. Specifically, the outer diameter of the end face 125 of element 120 near the gas inlet is larger than the outer diameter of the end face 126 of element 120 near the gas outlet. 【0045】 In this embodiment, the element 120 has a cross-sectional area (cross-sectional area when cut by a plane parallel to the XY plane) or diameter (diameter of the outer edge) that decreases from the end face 125 near the gas inlet to the end face 126 near the gas outlet. In other words, the element 120 is frustoconical in shape, with the cross-sectional area or diameter gradually decreasing from the end face 125 in the negative Z-axis direction to the end face 126 in the positive Z-axis direction. 【0046】 As shown in Figures 4 and 5, the element 120 is formed by winding leaves 121. In this embodiment, the element 120 is formed by winding multiple leaves 121 of the same shape and size. Each leaf 121 is equipped with a gas separation membrane 122, and a spiral-shaped element 120 is formed by winding multiple leaves 121 around a winding axis A, which is a virtual axis extending in the Z-axis direction, around a gas flow channel pipe 130. The number of leaves 121 in the element 120 is not particularly limited, but may be around 10 to 10 tens of leaves, around 100 tens of leaves, or even more than that, or even just one leaf. The size of the leaves 121 is appropriately determined according to the amount of gas to be processed. 【0047】 The leaf 121 comprises gas separation membranes 122a and 122b as gas separation membranes 122, a raw gas side spacer 123, and a permeate side spacer 124. In this embodiment, the leaf 121 is stacked in the order of gas separation membrane 122a, raw gas side spacer 123, gas separation membrane 122b, and permeate side spacer 124. 【0048】 The gas separation membrane 122 (122a and 122b) is a membrane that selectively permeates a predetermined gas and separates the gas. In this embodiment, the gas separation membrane 122 selectively permeates carbon dioxide. As the gas separation membrane 122, any known membrane can be used as appropriate, such as a membrane containing organic substances such as resin (such as a membrane containing amines) or a membrane formed of inorganic materials. When the raw gas g1 is supplied to the gas separation membrane 122, it is separated into permeate gas g3 that permeates the gas separation membrane 122 and unpermeated gas g2 that does not permeate the gas separation membrane 122. The gas separation membrane 122 is a membrane that allows carbon dioxide in the raw gas g1 to pass through more easily than other gases, so the concentration of carbon dioxide in the permeate gas g3 becomes high and the concentration of carbon dioxide in the unpermeated gas g2 becomes low. If the concentration of carbon dioxide in the raw gas g1 is about 10%, the concentration of carbon dioxide in the permeate gas g3 will be about 20% to 90%, and the concentration of carbon dioxide in the unpermeated gas g2 will be about 1% to 5%. This allows for the recovery of permeate gas g3, which has a high concentration of carbon dioxide, and unpermeated gas g2, which has a low concentration of carbon dioxide. 【0049】 The raw gas side spacer 123 is a mesh-like (net-like, mesh structure) or other member (raw gas flow path forming member) that forms a flow path for the raw gas g1. The raw gas side spacer 123 is placed between the gas separation membrane 122a and the gas separation membrane 122b to maintain the distance between the gas separation membrane 122a and the gas separation membrane 122b and ensure the flow of the raw gas g1. As the raw gas side spacer 123, various materials and shapes can be used as long as they have sufficient strength and heat resistance and can maintain the distance between the gas separation membrane 122a and the gas separation membrane 122b and ensure the flow path for the raw gas g1. Specifically, at least one material from among polyester-based materials such as epoxy-impregnated polyester, polyolefin-based materials such as polypropylene, fluorine-based materials such as polytetrafluoroethylene, inorganic materials such as metal, glass, and ceramics, cloth such as nonwoven fabric, and fibers such as paper may be used as the raw gas side spacer 123. The thickness of the raw gas side spacer 123 is not particularly limited, but is preferably 100 μm or more and 1000 μm or less, more preferably 150 μm or more and 950 μm or less, and even more preferably 200 μm or more and 900 μm or less. 【0050】 The permeate-side spacer 124 is a mesh-like (net-like, mesh structure) or other member (permeate gas flow path forming member) that forms a flow path for the permeate gas g3. The permeate-side spacer 124 is positioned to sandwich the gas separation membrane 122a or gas separation membrane 122b between it and the raw gas-side spacer 123 (see Figure 6). As a result, the permeate-side spacer 124 is positioned between the gas separation membrane 122a and the gas separation membrane 122b, maintaining the distance between them and ensuring the flow of permeate gas g3. The permeate-side spacer 124 is in communication with the gas flow path pipe 130, and the permeate gas g3 that has permeated through the gas separation membrane 122a and the gas separation membrane 122b is sent to the gas flow path pipe 130 through the permeate-side spacer 124. As the permeate-side spacer 124, any material and shape can be used, as long as it has sufficient strength and heat resistance and can maintain the distance between the gas separation membranes 122a and 122b to secure the flow path for the permeate gas g3. The permeate-side spacer 124 may be made of the same material and structure as the raw gas-side spacer 123, or it may be made of a different material and structure than the raw gas-side spacer 123. 【0051】 As shown in Figure 5, when the wound state of the leaf 121 is unfolded and spread out into a flat surface, it has an edge 127a in the Z-axis negative direction, an edge 127b in the Z-axis positive direction, an edge 127c in the X-axis positive direction, and an edge 127d in the X-axis negative direction. In the leaf 121, raw gas g1 flows in from the Z-axis negative edge 127a, and unpermeable gas g2 flows out from the Z-axis positive edge 127b. For this reason, the edge 127a of the leaf 121 is the edge closest to the gas inlet of the leaf 121, and the edge 127b of the leaf 121 is the edge closest to the gas outlet of the leaf 121. The edge 127c of the leaf 121 is the innermost edge of the element 120 and is connected to the gas flow channel pipe 130. The edge 127d of the leaf 121 is the outermost edge of the element 120. 【0052】 In this configuration, the leaf 121 has a shape in which the length L1 of the edge 127a in the negative Z-axis direction is longer than the length L2 of the edge 127b in the positive Z-axis direction. In other words, the length L1 of the edge 127a of the leaf 121 near the gas inlet is longer than the length L2 of the edge 127b of the leaf 121 near the gas outlet. Length L1 is the length of the edge 127a in the winding direction of the leaf 121, and length L2 is the length of the edge 127b in the winding direction of the leaf 121. The winding direction of the leaf 121 is the direction in which the leaf 121 is wound, and in Figure 5(a) it is shown as the X-axis direction. When the amount of permeate gas g3 is large and the amount of unpermeated gas g2 is small due to a high concentration of a predetermined gas (carbon dioxide in this embodiment) in the raw gas g1, it is preferable to increase the ratio of length L1 to length L2. On the other hand, if the amount of permeated gas g3 is small and the amount of unpermeated gas g2 is large, such as when the raw gas g1 is the atmosphere, it is preferable to reduce the ratio of length L1 to length L2. The ratio of length L1 to length L2 can also be appropriately determined by the permeability coefficient of the gas separation membrane 122 and the membrane area of ​​the gas separation membrane 122. 【0053】 In this embodiment, the width of the leaf 121 decreases from the edge 127a near the gas inlet to the edge 127b near the gas outlet. That is, the edge 127d of the leaf 121 is inclined linearly from the Z-axis direction, and the width (length in the X-axis direction in Figure 5) of the leaf 121 gradually decreases from the edge 127a in the Z-minus direction to the edge 127b in the Z-plus direction. In this embodiment, the leaf 121 is trapezoidal when unfolded from its wound state and spread out into a flat surface. 【0054】 The gas separation membrane 122 (gas separation membranes 122a and 122b), raw gas side spacer 123, and permeate side spacer 124 of the leaf 121 have the same shape as the leaf 121 described above. The edge 127d of the leaf 121 is sealed with resin or the like, but the position of the raw gas side spacer 123 does not need to be sealed. The edges 127a and 127b of the leaf 121 are sealed at the position of the permeate side spacer 124, but not at the position of the raw gas side spacer 123, allowing the raw gas g1 and unpermeated gas g2 to pass through. At the edge 127c of the leaf 121, the raw gas side spacer 123 is enclosed in the gas separation membrane 122, but not at the position of the permeate side spacer 124, allowing permeate gas g3 to pass through. 【0055】 [2.3 Description of gas flow tube 130] The gas flow channel 130 is a tubular member positioned within the element 120 through which the permeate gas g3 that has permeated the gas separation membrane 122 flows. The gas flow channel 130 is a cylindrical member positioned at the center of the element 120 when viewed from the Z-axis direction and extending in the Z-axis direction. The gas flow channel 130 has a plurality of through holes 131 arranged in the longitudinal direction (Z-axis direction) and the circumferential direction of the outer circumference. These plurality of through holes 131 are through holes through which the permeate gas g3 passes. The gas flow channel 130 is in communication with the flow path of the permeate gas g3 formed by the permeate-side spacer 124, and the permeate gas g3 that has permeated the gas separation membrane 122 flows inward into the gas flow channel 130 from the plurality of through holes 131. The gas flow channel 130 causes the incoming permeate gas g3 to flow in the Z-axis direction along the flow path inside the gas flow channel 130. 【0056】 In this embodiment, the gas flow channel pipe 130 has its end in the negative Z-axis direction blocked by an insert plug or the like, allowing the permeate gas g3 to flow out from its end in the positive Z-axis direction. Alternatively, the gas flow channel pipe 130 may have its end in the positive Z-axis direction blocked, allowing the permeate gas g3 to flow out from its end in the negative Z-axis direction. Alternatively, the gas flow channel pipe 130 may not have both ends in the Z-axis direction blocked, allowing the permeate gas g3 to flow out from both ends in the Z-axis direction. 【0057】 The shape of the gas flow channel tube 130 is not particularly limited as long as it allows the permeate gas g3 to flow in and out, and it may be an elliptical tube, a long cylindrical tube, a rectangular tube, or other polygonal tube. The gas flow channel tube 130 is made of resin or the like, but the material is not particularly limited, and any known material can be used as appropriate. The number, arrangement, shape, and size of the through holes 131 in the gas flow channel tube 130 are not particularly limited. 【0058】 [2.4 Description of the gas separation method in the gas separation membrane module 100] In the configuration described above, the raw gas g1 flowing in from the raw gas inlet 111 of the container 110 of the gas separation membrane module 100 flows from the end face 125 in the negative Z-axis direction of the element 120 to the end face 126 in the positive Z-axis direction of the element 120. Specifically, the raw gas g1 flows from the end face 125 to the end face 126 of the element 120 through the raw gas side spacer 123 of each leaf 121 of the element 120. 【0059】 As a result, as shown in Figure 6, the raw gas g1 flows through the raw gas side spacer 123, and a portion of it permeates through the gas separation membrane 122 and flows into the permeate side spacer 124 as permeate gas g3 (gas flow F1 in Figure 6). The permeate gas g3 that has flowed into the permeate side spacer 124 flows through the permeate side spacer 124 towards the gas flow pipe 130 (gas flow F2 in Figure 6). Subsequently, the permeate gas g3 flows from the permeate side spacer 124 through the through hole 131 of the gas flow pipe 130 and into the gas flow pipe 130 (gas flow F3 in Figure 6). The permeate gas g3 that has flowed into the gas flow pipe 130 is discharged from the permeate gas outlet 113 of the container 110. The raw gas g1 that has passed through the element 120 without permeating through the gas separation membrane 122 is discharged as unpermeated gas g2 from the unpermeated gas outlet 112 of the container 110. 【0060】 Thus, the gas separation membrane module 100 is a cross-flow filter that performs cross-flow operation, selectively permeating a predetermined gas (carbon dioxide) from the raw gas g1 by flowing the supplied raw gas g1 parallel to the gas separation membrane 122, etc., thereby separating the gas. 【0061】 [2.5 Description of the first gas separation membrane module 101 and the second gas separation membrane module 102] Figure 7 is a perspective view showing the configuration of the first gas separation membrane module 101 and the second gas separation membrane module 102 according to this embodiment. Figure 7 is an enlarged perspective view showing one adjacent first gas separation membrane module 101 and one second gas separation membrane module 102 shown in Figure 1. In Figure 7, as in Figure 3, the internal configuration of the first gas separation membrane module 101 and the second gas separation membrane module 102 is shown with dashed lines. 【0062】 As shown in Figure 7, the gas separation device 10 comprises two spiral-shaped gas separation membrane modules 100, namely the first gas separation membrane module 101 and the second gas separation membrane module 102. 【0063】 The first gas separation membrane module 101 comprises a first container 110A, a first element 120A around which a first leaf 121A equipped with a first gas separation membrane 122A is wound, and a first gas flow tube 130A. The first container 110A is the same as the container 110 described above, the first element 120A (first gas separation membrane 122A, first leaf 121A) is the same as the element 120 (gas separation membrane 122, leaf 121) described above, and the first gas flow tube 130A is the same as the gas flow tube 130 described above. For this reason, the length of the edge 127a of the first leaf 121A near the gas inlet is longer than the length of the edge 127b of the first leaf 121A near the gas outlet. 【0064】 The second gas separation membrane module 102 comprises a second container 110B, a second element 120B around which a second leaf 121B equipped with a second gas separation membrane 122B is wound, and a second gas flow tube 130B. The second container 110B is the same as the container 110 described above, the second element 120B (second gas separation membrane 122B, second leaf 121B) is the same as the element 120 (gas separation membrane 122, leaf 121) described above, and the second gas flow tube 130B is the same as the gas flow tube 130 described above. For this reason, the length of the edge 127a of the second leaf 121B near the gas inlet is longer than the length of the edge 127b of the second leaf 121B near the gas outlet. 【0065】 The first gas separation membrane module 101 and the second gas separation membrane module 102 are arranged in an inverted position. As a result, the first container 110A and the second container 110B are arranged in an inverted position. The first gas flow channel pipe 130A and the second gas flow channel pipe 130B are also arranged in an inverted position. 【0066】 The first element 120A and the second element 120B are arranged in an inverted orientation. In the first element 120A, raw gas g1 flows in from the end face 125A in the Z-axis negative direction, and unpermeable gas g2 flows out from the end face 126A in the Z-axis positive direction. In the second element 120B, raw gas g1 flows in from the end face 125B in the Z-axis positive direction, and unpermeable gas g2 flows out from the end face 126B in the Z-axis negative direction. Therefore, the gas inlet and gas outlet of the first element 120A and the second element 120B are arranged in opposite directions. 【0067】 [3. Explanation of the effect] As described above, the gas separation membrane module 100 according to this embodiment includes an element 120 around which a leaf 121 equipped with a gas separation membrane 122 is wound. The length of the edge 127a of the leaf 121 near the gas inlet is longer than the length of the edge 127b of the leaf 121 near the gas outlet. In other words, the length of the edge 127b of the leaf 121 near the gas outlet is shorter than the length of the edge 127a of the leaf 121 near the gas inlet. By shortening the length of the edge 127b of the leaf 121 near the gas outlet, the membrane area of ​​the gas separation membrane 122 is reduced, which reduces the gas flow rate supplied to the element 120 and thus reduces the pressure loss near the gas inlet of the element 120. Near the gas outlet of the leaf 121, the gas flow path from the outer periphery of the element 120 towards the center is shortened, thus reducing the pressure loss when the gas flows from the outer periphery of the element 120 towards the center. By shortening the length of the edge 127b of the leaf 121 near the gas outlet, the portion of the gas separation membrane 122 near the gas outlet and outer circumference of the element 120 that cannot be effectively used can be cut, thereby improving the gas separation performance (permeability and selectivity) per unit area of ​​the gas separation membrane 122. Since the membrane area of ​​the gas separation membrane 122 is reduced, this also contributes to cost reduction. As a result, the reliability of the gas separation membrane module 100 can be improved. 【0068】 Each of the effects described above is specific to the gas separation membrane module 100, which is equipped with a gas separation membrane 122 for separating gases. The gas separation membrane module 100 is a different technology from the liquid separation membrane module, which is equipped with a filtration membrane for filtering liquids (separating solids in a liquid by a sieving effect), and is fundamentally different in its concept. In the liquid separation membrane module, if the length of the edge of the leaf near the liquid outlet is shortened, the purpose is to increase the flow velocity near the liquid outlet of the element to wash away deposits on the surface of the filtration membrane. In the gas separation membrane module 100, no deposits are generated on the surface of the gas separation membrane 122, so the idea of ​​washing away deposits does not arise, and the concept is completely different from that of the liquid separation membrane module. Thus, the gas separation membrane module 100 in this embodiment and the liquid separation membrane module are completely different technologies because they separate different objects, principles, and purposes, and the configuration of the liquid separation membrane module cannot be easily applied to the gas separation membrane module 100. 【0069】 The gas separation membrane 122 selectively permeates carbon dioxide, separating the supplied gas (raw gas g1) into a gas with a high carbon dioxide concentration (permeated gas g3) and a gas with a low carbon dioxide concentration (unpermeated gas g2). This allows for the recovery of the desired gas from both the high-carbon dioxide gas (permeated gas g3) and the low-carbon dioxide gas (unpermeated gas g2). 【0070】 In leaf 121, by reducing the width from the edge 127a near the gas inlet to the edge 127b near the gas outlet, the effects of reducing pressure loss and improving gas separation performance described above can be achieved more effectively. 【0071】 In element 120, the area S1 of the end face 125 near the gas inlet is larger than the area S2 of the end face 126 near the gas outlet, making it easy to form element 120 of this shape. In other words, by winding a leaf 121 in which the length of the edge 127a near the gas inlet is longer than the length of the edge 127b near the gas outlet, element 120 can be formed in which the area S1 of the end face 125 near the gas inlet is larger than the area S2 of the end face 126 near the gas outlet. For this reason, element 120 of this shape can be easily formed. 【0072】 Because the element 120 is frustoconical, it is easy to form an element 120 of that shape. In other words, by winding a leaf 121 in which the length of the edge 127a near the gas inlet is longer than the length of the edge 127b near the gas outlet, a frustoconical element 120 can be easily formed. 【0073】 According to the gas separation device 10 of this embodiment, in the first gas separation membrane module 101, the length of the edge 127a of the first leaf 121A near the gas inlet is longer than the length of the edge 127b near the gas outlet. In the second gas separation membrane module 102, the length of the edge 127a of the second leaf 121B near the gas inlet is longer than the length of the edge 127b near the gas outlet. As a result, the gas separation device 10 can reduce pressure loss and improve gas separation performance in both the first gas separation membrane module 101 and the second gas separation membrane module 102, thereby improving reliability. The first element 120A of the first gas separation membrane module 101 and the second element 120B of the second gas separation membrane module 102 have their gas inlets and gas outlets arranged in opposite directions. By combining gas separation membrane modules 100 in this reversed direction, multiple gas separation membrane modules 100 can be installed in a narrow space (the number of gas separation membrane modules 100 per unit volume can be increased). 【0074】 The distance between the gas outlet of the first gas separation membrane module 101 and the gas inlet of the second gas separation membrane module 102 can be shortened. Therefore, when supplying gas discharged from the first gas separation membrane module 101 to the second gas separation membrane module 102, the length of the piping connecting the first gas separation membrane module 101 and the second gas separation membrane module 102 can be shortened. Furthermore, when circulating gas between the first gas separation membrane module 101 and the second gas separation membrane module 102, the distance between the gas outlet of the second gas separation membrane module 102 and the gas inlet of the first gas separation membrane module 101 can be shortened, thus shortening the length of the piping connecting them (return piping). In this case, the effect of shortening the length of the piping (return piping or all piping) is greater compared to when the first gas separation membrane module 101 and the second gas separation membrane module 102 are arranged in series (in a row) and gas is circulated. In particular, in this embodiment, the diameter of the gas outlet side of the gas separation membrane module 100 is relatively small, which also contributes to shortening the length of the piping. The larger the size of the gas separation membrane module 100, the greater the effect of being able to shorten the length of the piping. Shortening the length of the piping reduces pressure loss, reduces the amount of piping material used (material cost), and allows for miniaturization and space saving of the gas separation device 10. 【0075】 [4. Explanation of variations] Although the gas separation membrane module 100 and gas separation apparatus 10 according to this embodiment have been described above, the present invention is not limited to the above embodiment. The embodiments disclosed herein are illustrative and not restrictive in all respects, and the scope of the present invention includes all modifications in the sense and scope equivalent to the claims. 【0076】 (Variation 1) In the above embodiment, the element 120 is configured such that the area S1 of the end face 125 near the gas inlet is larger than the area S2 of the end face 126 near the gas outlet. However, the area S1 of the end face 125 may be less than or equal to the area S2 of the end face 126. In this case, by changing the shape of the gas flow channel pipe 130, the length L1 of the edge 127a of the leaf 121 near the gas inlet can be made longer than the length L2 of the edge 127b of the leaf 121 near the gas outlet. Figure 8 is a perspective view showing the configuration of a gas separation membrane module 100A according to Modification 1 of this embodiment. Figure 8 corresponds to Figure 3. 【0077】 As shown in Figure 8, the gas separation membrane module 100A in this modified example is equipped with a container 110C, an element 120C, and a gas flow channel 130C, instead of the container 110, element 120, and gas flow channel 130 that are present in the gas separation membrane module 100 in the above embodiment. 【0078】 Container 110C is a cylindrical container extending in the Z-axis direction, with the area of ​​its bottom surface (the surface in the negative Z-axis direction) and the area of ​​its top surface (the surface in the positive Z-axis direction) being the same. A space (cavity) for housing the element 120C and the gas flow path pipe 130C is formed inside. Element 120C has a cylindrical shape extending in the Z-axis direction, with the area of ​​its bottom surface (the surface in the negative Z-axis direction) and the area of ​​its top surface (the surface in the positive Z-axis direction) being the same. In other words, the area S3 of the end face 125C of element 120C near the gas inlet is the same as the area S4 of the end face 126C of element 120C near the gas outlet. Gas flow path pipe 130C is a frustoconical tubular member with an opening area on its bottom surface (the surface in the negative Z-axis direction) being smaller than the opening area on its top surface (the surface in the positive Z-axis direction). In other words, the opening area S5 of the end face 132 of the gas flow tube 130C near the gas inlet of element 120C is smaller than the opening area S6 of the end face 133 of the gas flow tube 130C near the gas outlet of element 120C. 【0079】 Thus, since the opening area S5 of the end face 132 of the gas flow channel pipe 130C is smaller than the opening area S6 of the end face 133, the area S3 of the end face 125C near the gas inlet of the element 120C is larger than the area S4 of the end face 126C near the gas outlet of the element 120C. In other words, the element 120C is formed by winding multiple leaves 121C, and the length of the edge of the leaf 121C near the gas inlet is longer than the length of the edge of the leaf 121C near the gas outlet. The other configurations of this modified example are the same as those of the embodiment described above, so their explanation will be omitted. 【0080】 In this modified example, the same effects as in the above embodiment can be achieved. In particular, in this modified example, in the gas flow channel pipe 130C, the opening area S5 of the end face 132 near the gas inlet is smaller than the opening area S6 of the end face 133 near the gas outlet. As a result, even if a leaf 121C with a longer edge length near the gas inlet than the edge length near the gas outlet is wound around the gas flow channel pipe 130C, it is possible to prevent the outer edge of the end face 125C near the gas inlet of the element 120C from becoming too large, or the outer edge of the end face 126C near the gas outlet of the element 120C from becoming too small. In this modified example, since the element 120C can be formed in a cylindrical shape, the container 110C can be formed in a cylindrical shape. In the gas flow channel pipe 130C, since the opening area S6 of the end face 133 near the gas outlet is larger than the opening area S5 of the end face 132 near the gas inlet, the pressure loss in the gas flow channel pipe 130C near the gas outlet can be reduced. 【0081】 In the above modified example, the element 120C may have an area S3 of the end face 125C near the gas inlet that is smaller or larger than the area S4 of the end face 126C near the gas outlet. The container 110C may have an area of ​​its bottom surface (the surface in the negative Z-axis direction) that is smaller or larger than the area of ​​its top surface (the surface in the positive Z-axis direction). 【0082】 (Other variations) In the above embodiment, the element 120 is assumed to be a frustoconical shape in which the area S1 of the end face 125 near the gas inlet is larger than the area S2 of the end face 126 near the gas outlet, but it is not limited to this. The element 120 only needs to have a shape in which the area S1 of the end face 125 is larger than the area S2 of the end face 126, and may be a shape other than a frustoconical shape, such as an elliptical frustoconical shape, an oblong frustoconical shape, a square frustoconical shape, or other frustoconical shapes. 【0083】 In the above embodiment, the element 120 is formed by winding multiple leaves 121, but it may also be formed by winding a single leaf 121. 【0084】 In the above embodiment, the leaf 121 is assumed to be trapezoidal when unfolded from its wound state and spread out into a flat surface, but it is not limited to this. The leaf 121 may be triangular, or its edge 127d may be curved, or its edge 127d may be stepped (staircase-like), etc. 【0085】 In the above embodiment, the leaf 121 is designed so that its width decreases from the edge 127a near the gas inlet to the edge 127b near the gas outlet, but it is not limited to this. The leaf 121 only needs to have an edge 127a with a length L1 that is longer than the edge 127b with a length L2, and its width may increase in the middle of the transition from edge 127a to edge 127b. 【0086】 In the above embodiment, the gas separation membrane 122 is configured to selectively permeate carbon dioxide, but it may also selectively permeate gases other than carbon dioxide. 【0087】 In the above embodiment, the first gas separation membrane module 101 and the second gas separation membrane module 102 have the same configuration, but they may have different configurations. 【0088】 In the above embodiment, the gas separation device 10 is provided with both a first gas separation membrane module 101 and a second gas separation membrane module 102, but it is also possible to have a configuration that provides only one of the first gas separation membrane module 101 or the second gas separation membrane module 102. 【0089】 In the above embodiment, all gas separation membrane modules 100 are assumed to have the above configuration, but it is not necessary for any of the gas separation membrane modules 100 to have the above configuration. 【0090】 Embodiments constructed by arbitrarily combining the above embodiments and their variations are also included within the scope of the present invention. [Explanation of Symbols] 【0091】 10 Gas separation device 100, 100A Gas Separation Membrane Module 101 First Gas Separation Membrane Module 102 Second gas separation membrane module 110, 110C container 110A First container 110B Second container 111 Raw gas inlet 112 Unpermeable gas outlet 113 Permeable gas outlet 120, 120C element 120A First Element 120B Second Element 121, 121C Leaf 121A First Leaf 121B Second Leaf 122, 122a, 122b Gas separation membranes 122A First gas separation membrane 122B Second gas separation membrane 123 Raw gas side spacer 124 Transmissive side spacer 125, 125A, 125B, 125C, 126, 126A, 126B, 126C, 132, 133 End face 127a, 127b, 127c, 127d Edge 130, 130C gas flow tube 130A First gas flow pipe 130B Second gas flow tube 131 Through hole 210, 220, 230 piping

Claims

[Claim 1] A spiral-type gas separation membrane module, It comprises an element around which a leaf is wound, which has a gas separation membrane that selectively permeates a predetermined gas, The length of the edge of the leaf closest to the gas inlet is longer than the length of the edge of the leaf closest to the gas outlet. Gas separation membrane module. [Claim 2] The aforementioned gas separation membrane selectively permeates carbon dioxide. The gas separation membrane module according to claim 1. [Claim 3] The leaf becomes narrower as you move from the edge closer to the gas inlet to the edge closer to the gas outlet. The gas separation membrane module according to claim 1 or 2. [Claim 4] The area of ​​the end face of the element closest to the gas inlet is larger than the area of ​​the end face of the element closest to the gas outlet. The gas separation membrane module according to claim 1 or 2. [Claim 5] The element is frustoconical in shape. The gas separation membrane module according to claim 4. [Claim 6] The element further comprises a gas flow channel pipe, through which the permeate gas that has passed through the gas separation membrane flows, The opening area of ​​the end face of the gas flow channel pipe near the gas inlet of the element is smaller than the opening area of ​​the end face of the gas flow channel pipe near the gas outlet of the element. The gas separation membrane module according to claim 1 or 2. [Claim 7] It is equipped with two spiral-shaped gas separation membrane modules, the first gas separation membrane module and the second gas separation membrane module. The first gas separation membrane module is The system comprises a first element around which a first leaf, which includes a first gas separation membrane, is wound. The length of the edge of the first leaf closest to the gas inlet is longer than the length of the edge of the first leaf closest to the gas outlet. The second gas separation membrane module is, It comprises a second element around which a second leaf, which has a second gas separation membrane, is wound. The length of the edge of the second leaf closest to the gas inlet is longer than the length of the edge of the second leaf closest to the gas outlet. The first element and the second element are arranged with their gas inlet and gas outlet in opposite directions. Gas separation device.

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