Degassing module and liquid degassing method

Abstract

The degassing module comprises a plurality of degassing elements, a tubular portion extending in the extension direction to accommodate the plurality of degassing elements, a first sealing portion sealing the gap between the first end of each of the plurality of degassing elements and the tubular portion, a second sealing portion sealing the gap between the second end of each of the plurality of degassing elements and the tubular portion, a blocking portion blocking the end of the liquid flow pipe of each of the plurality of degassing elements on the first extension direction side, a liquid supply port, and a liquid discharge port, and a liquid collection area extending in the extension direction without the plurality of degassing elements being disposed is formed between the first sealing portion and the second sealing portion in the extension direction within the tubular portion, and the liquid discharge port opens into the liquid collection area.

Description

[Technical Field]

[0001] The present disclosure relates to a degassing module and a method for degassing a liquid. [Background technology]

[0002] Patent Document 1 describes a degassing module (degassing system) in which multiple degassing elements (degassing units) are housed in a cylindrical housing. In this degassing module, when liquid is supplied through an inlet of the housing, the liquid is degassed in each of the multiple degassing elements. The liquid that comes out of the multiple degassing elements is then discharged from an outlet of the housing. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2020 / 138096 Summary of the Invention [Problem to be solved by the invention]

[0004] The degassing module described in Patent Document 1 is configured so that the liquid coming out of each of the multiple degassing elements passes through the narrow gaps between the multiple degassing elements, exits the multiple degassing elements, and collects near the outlet of the housing. This requires an area on the outlet side of the multiple degassing elements where the liquid coming out of each of the multiple degassing elements can collect. This results in a problem of the module being long in the extension direction of the housing. Another problem is that the liquid passes through the narrow gaps between the multiple degassing elements over the entire length of the multiple degassing elements, resulting in a large pressure loss of the liquid.

[0005] Therefore, an object of the present disclosure is to provide a degassing module and a method for degassing a liquid that can be shortened and that can reduce the pressure loss of the liquid. [Means for solving the problem]

[0006] [1] A degassing module according to the present disclosure includes a plurality of degassing elements, each having a liquid flow pipe having a plurality of openings formed therein to form a liquid flow passage, and a hollow fiber membrane bundle formed by arranging a plurality of hollow fiber membranes around the liquid flow pipe so as to cover the plurality of openings; a cylindrical portion extending in an extension direction and accommodating the plurality of degassing elements; a first sealing portion sealing the gap between a first end portion, which is an end portion on one side of each of the plurality of degassing elements, and the cylindrical portion; a second sealing portion arranged opposite to the first sealing portion in the extension direction and sealing the gap between a second end portion, which is an end portion on the opposite side of the first end portion of each of the plurality of degassing elements, and the cylindrical portion; a liquid supply port connected to an end on the second extension direction side, which is the opposite direction to the first extension direction of the extension direction of the liquid flow pipes of each of the plurality of degassing elements, for supplying liquid to each liquid flow passage of the plurality of degassing elements; and a liquid discharge port for discharging liquid that flows out from the plurality of openings of the liquid flow pipes of each of the plurality of degassing elements. Between the first sealing portion and the second sealing portion in the extension direction within the cylindrical portion, a liquid collection region is formed that extends in the extension direction without the plurality of degassing elements being disposed therein, in order to collect liquid that flows out from the plurality of openings of the liquid flow pipes of each of the plurality of degassing elements, and the liquid discharge port opens into the liquid collection region.

[0007] In this degassing module, a liquid collection area extending in the extension direction without multiple degassing elements is formed between the first sealing portion and the second sealing portion in the extension direction within the cylindrical portion, and the liquid discharge port opens into the liquid collection area. Therefore, even without providing an area for collecting liquid from each of the multiple degassing elements on the first extension direction side of the multiple degassing elements, the liquid from each of the multiple degassing elements can be collected and discharged. This allows the length of the degassing module in the extension direction to be shortened. Furthermore, the liquid from each of the multiple degassing elements can be collected and discharged over the entire length of the multiple degassing elements without passing through narrow gaps between the multiple degassing elements. This reduces liquid pressure loss.

[0008] [2] In the degassing module described in [1], the liquid collection area may have a cross-sectional area in a cross section perpendicular to the extension direction that is larger than each of the plurality of degassing elements. In this degassing module, the liquid collection area has a cross-sectional area in a cross section perpendicular to the extension direction that is larger than each of the plurality of degassing elements, so that liquid coming out of each of the plurality of degassing elements tends to collect in the liquid collection area.

[0009] [3] In the degassing module according to [1] or [2], the liquid collection area may have a convex cross section in a cross section perpendicular to the extension direction that is larger than the cross-sectional area of ​​each of the plurality of degassing elements. In this degassing module, the liquid collection area has a convex cross section in a cross section perpendicular to the extension direction that is larger than the cross-sectional area of ​​each of the plurality of degassing elements, so that liquid coming out of each of the plurality of degassing elements tends to collect in the liquid collection area.

[0010] [4] In the degassing module according to any one of [1] to [3], the liquid collection area may be located at the center of the cylindrical portion. In this degassing module, since the liquid collection area is located at the center of the cylindrical portion, the liquids coming out of the respective degassing elements are likely to collect in the liquid collection area.

[0011] [5] In the degassing module according to any one of [1] to [3], the liquid collecting area may be adjacent to the cylindrical portion. In this degassing module, since the liquid collecting area is adjacent to the cylindrical portion, it is possible to easily arrange a plurality of degassing elements.

[0012] [6] In the degassing module according to [4] or [5], the liquid discharge port may be connected to either the first sealing portion or the second sealing portion and open to the liquid collection region from either the first sealing portion or the second sealing portion. In this degassing module, the liquid discharge port is connected to either the first sealing portion or the second sealing portion and opens to the liquid collection region from either the first sealing portion or the second sealing portion, so that the liquid collected in the liquid collection region can be efficiently discharged.

[0013] [7] In the degassing module described in [5], the liquid discharge port may be provided in the cylindrical portion. In this degassing module, since the liquid discharge port is provided in the cylindrical portion, the liquid collected in the liquid collection region can be efficiently discharged.

[0014] [8] In the degassing module according to any one of [1] to [7], the spacing between the hollow fiber membrane bundles of the degassing elements may be at least 0.09 times the outer diameter of each of the degassing elements. In this degassing module, the spacing between the hollow fiber membrane bundles of the degassing elements is at least 0.09 times the outer diameter of each of the degassing elements, which prevents the liquid flow velocity and flow rate between the degassing elements from becoming locally excessive. This prevents the liquid from drifting around the degassing elements, thereby reducing the pressure loss of the liquid and improving the degassing efficiency.

[0015] [9] In the degassing module according to any one of [1] to [8], the plurality of degassing elements may have different outer diameters. In this degassing module, the plurality of degassing elements have different outer diameters, which makes it possible to easily adjust the arrangement of the liquid collecting regions, the spacing between the plurality of degassing elements, etc.

[0016]

[10] The degassing module according to any one of [1] to [9], further comprising: a first lid connected to an end of the tubular portion in the first extension direction and forming a first end communication space communicating with the hollow portions of the hollow fiber membranes; a second lid connected to an end of the tubular portion in the second extension direction and forming a second end communication space communicating with the hollow portions of the hollow fiber membranes; and a gas port for discharging gas that has permeated through the hollow fiber membranes of each of the degassing elements, wherein the gas port may be provided in at least one of the first lid and the second lid and open to at least one of the first end communication space and the second end communication space. In this degassing module, the first lid and the second lid are connected to both ends of the tubular portion in the extension direction, and a gas port is provided in at least one of the first lid and the second lid and open to at least one of the first end communication space and the second end communication space. This allows efficient suction of the hollow portions of the hollow fiber membranes from the gas port of each of the degassing elements.

[0017]

[11] A liquid degassing method according to the present disclosure is a method for degassing a liquid using the degassing module according to any one of [1] to

[10] , in which the hollow portions of the hollow fiber membranes of each of the degassing elements are suctioned while the liquid is supplied to the liquid supply port. In this liquid degassing method, the liquid is degassed in any one of the above degassing modules by suctioning the hollow portions of the hollow fiber membranes of each of the degassing elements while supplying the liquid to the liquid supply port. This allows the length of the degassing module in the extension direction to be shortened and the pressure loss of the liquid to be reduced. [Effects of the Invention]

[0018] According to the present disclosure, it is possible to shorten the length and reduce the pressure loss of the liquid. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 2 is a schematic cross-sectional view of a degassing module according to an embodiment. [Figure 2] FIG. 2 is a schematic cross-sectional view taken along line II-II shown in FIG. [Figure 3] FIG. 2 is a schematic cross-sectional view showing a part of the degassing element shown in FIG. [Figure 4] FIG. 2 is a schematic cross-sectional view showing a part of the degassing element shown in FIG. [Figure 5] 1 is a graph showing the simulation results of Examples 1 to 5. [Figure 6] FIG. 10 is a schematic cross-sectional view of a degassing module according to a modified example. [Figure 7] FIG. 7 is a schematic cross-sectional view taken along line VII-VII shown in FIG. [Figure 8] 8(a), 8(b), 8(c), and 8(d) are schematic cross-sectional views showing degassing modules of modified examples. [Figure 9] 9(a), 9(b), 9(c), and 9(d) are schematic cross-sectional views showing degassing modules of modified examples. DETAILED DESCRIPTION OF THE INVENTION

[0020] Hereinafter, a degassing module and a liquid degassing method according to an embodiment will be described with reference to the drawings. In all the drawings, the same or corresponding parts are designated by the same reference numerals, and redundant explanations will be omitted.

[0021] [Degassing module] Fig. 1 is a schematic cross-sectional view of a degassing module according to an embodiment. Fig. 2 is a schematic cross-sectional view taken along line II-II in Fig. 1. As shown in Figs. 1 and 2, the degassing module 1 according to this embodiment is a module for degassing a liquid L. The liquid L is not particularly limited, but may be, for example, tap water, drinking water, pure water, ultrapure water, seawater, industrial water, or other water; an aqueous solution in which ammonium sulfate, a surfactant, or the like is dissolved; an organic solvent such as alcohol or hydrocarbon; or an ionic liquid. The degassing module 1 includes a plurality of degassing elements 2, a housing 3, a first sealing portion 4, and a second sealing portion 5.

[0022] Fig. 3 is a schematic cross-sectional view showing a part of the degassing element shown in Fig. 1. Fig. 4 is a schematic cross-sectional view showing a part of the degassing element shown in Fig. 1. As shown in Figs. 1 to 4, the degassing element 2 is for degassing a liquid L. The degassing element 2 includes a liquid distribution pipe 21, a hollow fiber membrane bundle 23, a first fixing part 24, and a second fixing part 25.

[0023] The liquid circulation pipe 21 is a cylindrical member extending in the extension direction D2. One of the two directions of the extension direction D2 is referred to as a first extension direction D21, and the direction opposite to the first extension direction D21 is referred to as a second extension direction D22. In FIG. 1, the upper side is the first extension direction D21, and the lower side is the second extension direction D22. The end of the degassing element 2 on the first extension direction D21 side is referred to as a first end 2a, and the end of the degassing element 2 on the second extension direction D22 side is referred to as a second end 2b.

[0024] The liquid circulation pipe 21 forms a liquid circulation passage 21a. The liquid circulation passage 21a is a flow path (internal flow path) through which the liquid L can flow, and is formed by the inner circumferential surface of the liquid circulation pipe 21. The liquid circulation pipe 21 extends over the entire area in the extension direction D2 of the degassing element 2. That is, the liquid circulation pipe 21 extends from the end of the degassing element 2 in the first extension direction D21 to the end of the degassing element 2 in the second extension direction D22. The liquid circulation passage 21a of the liquid circulation pipe 21 is open in the first extension direction D21 and the second extension direction D22. The opening of the liquid circulation passage 21a of the liquid circulation pipe 21 on the first extension direction D21 side is referred to as a first-end liquid circulation pipe opening 21b, and the opening of the liquid circulation passage 21a of the liquid circulation pipe 21 on the second extension direction D22 side is referred to as a second-end liquid circulation pipe opening 21c.

[0025] A plurality of openings 21d are formed in the liquid circulation pipe 21. The plurality of openings 21d are holes for allowing the liquid L to flow from the liquid circulation passage 21a to the outside of the liquid circulation pipe 21, separate from the first end liquid circulation pipe opening 21b and the second end liquid circulation pipe opening 21c. In other words, the plurality of openings 21d are holes for allowing the liquid L to flow from the liquid circulation passage 21a to the outside of the liquid circulation pipe 21 in the radial direction of the liquid circulation pipe 21. The plurality of openings 21d are formed in the peripheral wall of the liquid circulation pipe 21, and open the liquid circulation passage 21a to the outside of the liquid circulation pipe 21.

[0026] The first end liquid flow pipe opening 21b of the liquid flow pipe 21 is closed by the closing portion 26. That is, the closing portion 26 closes the end 21e of the liquid flow passage 21a of the liquid flow pipe 21 on the first extension direction D21 side. The closing portion 26 is fitted into the end 21e of the liquid flow passage 21a of the liquid flow pipe 21 on the first extension direction D21 side. The closing portion 26 is also called a plug, etc. The closing portion 26 prevents the liquid L supplied to the liquid flow passage 21a of the liquid flow pipe 21 from being discharged from the liquid flow pipe 21 in the first extension direction D21. Therefore, the liquid L is not discharged from the liquid flow pipe 21 in the first extension direction D21, but is discharged radially outward from the liquid flow pipe 21 through the multiple openings 21d formed in the liquid flow pipe 21. In addition, in the liquid flow passage 21a of the liquid flow pipe 21, other than the blocking portion 26, no member for preventing the movement of the liquid L in the extending direction D2 is provided.

[0027] The hollow fiber membrane bundle 23 is configured such that the plurality of hollow fiber membranes 22 are arranged around the liquid distribution pipe 21 so as to cover the plurality of openings 21d. The plurality of hollow fiber membranes 22 extend along the liquid distribution pipe 21. The plurality of hollow fiber membranes 22 extending along the liquid distribution pipe 21 means that the plurality of hollow fiber membranes 22 extend along the extending direction D2 in the initial state (unused state) of the degassing element 2. The plurality of hollow fiber membranes 22 are bundled together in a cylindrical shape by being arranged around the liquid distribution pipe 21. Therefore, the hollow fiber membrane bundle 23 is formed by the plurality of hollow fiber membranes 22 into a cylindrical shape extending along the extending direction D2.

[0028] The hollow fiber membrane bundle 23 is formed, for example, by a hollow fiber membrane fabric (not shown) woven in the shape of a bamboo blind. The hollow fiber membrane fabric is a fabric in which a plurality of hollow fiber membranes 22 serving as weft yarns are woven with warp yarns (not shown). In the hollow fiber membrane fabric, a plurality of hollow fiber membranes 22 are arranged in the shape of a bamboo blind. The hollow fiber membrane fabric is wound around the liquid distribution pipe 21 so that the plurality of hollow fiber membranes 22 extend in the extension direction D2 and cover the plurality of openings 21d.

[0029] The hollow portions 22a of the hollow fiber membranes 22 are flow paths (intra-membrane flow paths) through which gas G can flow, and are formed by the inner circumferential surfaces of the hollow fiber membranes 22. The plurality of hollow fiber membranes 22 extend over the entire area in the extension direction D2 of the degassing element 2. That is, the plurality of hollow fiber membranes 22 extend from the end of the degassing element 2 in the first extension direction D21 to the end of the degassing element 2 in the second extension direction D22. The hollow portions 22a of the plurality of hollow fiber membranes 22 are open in the first extension direction D21 and the second extension direction D22. The hollow portions 22a of the plurality of hollow fiber membranes 22 refer to the hollow portions 22a of each of the plurality of hollow fiber membranes 22. The openings on the first extension direction D21 side of the hollow portions 22a of the multiple hollow fiber membranes 22 are referred to as first end hollow fiber membrane openings 22b, and the openings on the second extension direction D22 side of the hollow portions 22a of the multiple hollow fiber membranes 22 are referred to as second end hollow fiber membrane openings 22c.

[0030] The hollow fiber membrane 22 is a hollow fiber membrane that allows gas G to pass through but not liquid L. The material, shape, and form of the hollow fiber membrane 22 are not particularly limited. Examples of materials for the hollow fiber membrane 22 include polyolefin resins such as polypropylene, polyethylene, and polymethylpentene; silicone resins such as polydimethylsiloxane and its copolymers; and fluorine-based resins such as PTFE and vinylidene fluoride. Examples of the shape (sidewall shape) of the hollow fiber membrane 22 include a porous membrane, a microporous membrane, and a homogeneous membrane (non-porous membrane) that does not have any pores. Examples of the form of the hollow fiber membrane 22 include a symmetric membrane (homogeneous membrane) in which the entire membrane has a homogeneous chemical or physical structure, and an asymmetric membrane (heterogeneous membrane) in which the chemical or physical structure of the membrane varies depending on the membrane. An asymmetric membrane (heterogeneous membrane) is a membrane that has a non-porous dense layer and a porous layer. Non-porous means that it does not have pores through which a liquid can pass. Porous refers to the presence of pores through which a liquid can pass. In this case, the dense layer may be formed anywhere within the membrane, such as on the surface or inside the porous membrane. Heterogeneous membranes also include composite membranes with different chemical structures and multilayer membranes such as three-layer structures. Heterogeneous membranes using poly(4-methylpentene-1) resin are particularly preferred because they have a dense layer that blocks liquid L.

[0031] The first fixing portion 24 is located at the first end portion 2a and fixes the plurality of hollow fiber membranes 22 to the liquid circulation pipe 21 so as to seal the gap between the liquid circulation pipe 21 and the plurality of hollow fiber membranes 22 and leave the hollow portions 22a of the plurality of hollow fiber membranes 22 open. That is, the first fixing portion 24 fixes the end portion of the plurality of hollow fiber membranes 22 on the first extension direction D21 side to the liquid circulation pipe 21. The first fixing portion 24 seals the gap between the liquid circulation pipe 21 and the plurality of hollow fiber membranes 22. Furthermore, the first fixing portion 24 is not provided in the liquid circulation passages 21a of the liquid circulation pipe 21 and the hollow portions 22a of the plurality of hollow fiber membranes 22, leaving the liquid circulation passages 21a of the liquid circulation pipe 21 and the hollow portions 22a of the plurality of hollow fiber membranes 22 open. As described above, the first end liquid circulation pipe openings 21b of the liquid circulation passages 21a of the liquid circulation pipe 21 are blocked by the blocking portion 26. The first fixing portion 24 is made of, for example, resin.

[0032] The second fixing portion 25 is located at the second end portion 2b and fixes the plurality of hollow fiber membranes 22 to the liquid circulation pipe 21 so as to seal the gap between the liquid circulation pipe 21 and the plurality of hollow fiber membranes 22 and leave the hollow portions 22a of the plurality of hollow fiber membranes 22 open. That is, the second fixing portion 25 fixes the end of the plurality of hollow fiber membranes 22 on the second extending direction D22 side to the liquid circulation pipe 21. The second fixing portion 25 seals the gap between the liquid circulation pipe 21 and the plurality of hollow fiber membranes 22. Furthermore, the second fixing portion 25 is not provided in the liquid circulation passages 21a of the liquid circulation pipe 21 and the hollow portions 22a of the plurality of hollow fiber membranes 22, so that the liquid circulation passages 21a of the liquid circulation pipe 21 and the hollow portions 22a of the plurality of hollow fiber membranes 22 are open. The second fixing portion 25 is formed of, for example, resin.

[0033] The first fixing portion 24 and the second fixing portion 25 fix the plurality of hollow fiber membranes 22 to the liquid flow pipe 21, so that the plurality of hollow fiber membranes 22 extend along the extension direction D2 and are bundled into a cylindrical shape, thereby forming the hollow fiber membrane bundle 23 into a cylindrical shape extending along the extension direction D2.

[0034] In each of the multiple degassing modules 1, the hollow fiber membrane bundle 23 is exposed to the outside, but as long as the discharge of liquid L from the hollow fiber membrane bundle 23 is not significantly restricted, part or all of the hollow fiber membrane bundle 23 may be covered with a liquid-permeable material such as a net-like sheet or punched metal.

[0035] The housing 3 accommodates a plurality of degassing elements 2 arranged in parallel. The number of degassing elements 2 accommodated in the housing 3 is not particularly limited as long as it is two or more, and can be, for example, two or more and six or less.

[0036] The housing 3 comprises a tubular portion 31 that accommodates and surrounds a plurality of degassing elements 2, a first lid portion 32 that is connected to one end of the tubular portion 31, and a second lid portion 33 that is connected to the end of the tubular portion 31 opposite the first lid portion 32.

[0037] The tubular portion 31 is formed in a cylindrical shape extending in an extension direction D1. The extension direction D1 is also the opposing direction between the first cover portion 32 and the second cover portion 33. One of the extension directions D1 is referred to as a first extension direction D11, and the direction opposite to the first extension direction D11 is referred to as a second extension direction D12. In FIG. 1 , the upper side is the first extension direction D11, and the lower side is the second extension direction D12. The tubular portion 31 accommodates the degassing elements 2 so as to surround the periphery of the degassing elements 2. In this embodiment, the tubular portion 31 accommodates the degassing elements 2 so that the extension direction D2 of each of the multiple degassing elements 2 coincides with the extension direction D1 of the tubular portion 31. Therefore, the extension direction D1 of the tubular portion 31 and the extension direction D2 of each of the multiple degassing elements 2 are the same direction.

[0038] The first lid portion 32 is connected to the end portion of the tubular portion 31 on the first extension direction D11 side so as to cover the opening of the tubular portion 31 on the first extension direction D11 side. The second lid portion 33 is connected to the end portion of the tubular portion 31 on the second extension direction D12 side so as to cover the opening of the tubular portion 31 on the second extension direction D12 side. The first lid portion 32 and the second lid portion 33 may be detachably connected to the tubular portion 31, or may be formed integrally with the tubular portion 31 and connected to it in an undetachable manner.

[0039] The first sealing portion 4 seals the gap between the first fixing portion 24 of each of the multiple degassing elements 2 and the cylindrical portion 31, thereby sealing the gap between the first end portion 2a of each of the multiple degassing elements 2 and the cylindrical portion 31. In other words, the first sealing portion 4, together with the first fixing portion 24, seals the gap between the end portion of the liquid circulation pipe 21 of each of the multiple degassing elements 2 on the first extending direction D21 side, the end portion of the multiple hollow fiber membranes 22 of each of the multiple degassing elements 2 on the first extending direction D21 side, and the cylindrical portion 31, so that the hollow portions 22a of the multiple hollow fiber membranes 22 open to the first extending direction D21 side.

[0040] The second sealing portion 5 is disposed on the second extending direction D12 side of the first sealing portion 4 so as to face the first sealing portion 4 in the extending direction D1. The second sealing portion 5 seals between the second fixing portion 25 of each of the plurality of degassing elements 2 and the cylindrical portion 31, thereby sealing between the second end portion 2b of each of the plurality of degassing elements 2 and the cylindrical portion 31. In other words, the second sealing portion 5, together with the second fixing portion 25, seals between the end portion of the liquid distribution pipe 21 of each of the plurality of degassing elements 2 on the second extending direction D22 side, the end portion of the plurality of hollow fiber membranes 22 of each of the plurality of degassing elements 2 on the second extending direction D22 side, and the cylindrical portion 31, so that the hollow portions 22a of the plurality of hollow fiber membranes 22 are open in the second extending direction D22 side.

[0041] The first sealing portion 4 seals the gap between the first fixing portion 24 of each of the multiple degassing elements 2 and the cylindrical portion 31, thereby fixing the first fixing portion 24 of each of the multiple degassing elements 2 to the cylindrical portion 31. The second sealing portion 5 seals the gap between the second fixing portion 25 of each of the multiple degassing elements 2 and the cylindrical portion 31, thereby fixing the second fixing portion 25 of each of the multiple degassing elements 2 to the cylindrical portion 31. The first sealing portion 4 and the second sealing portion 5 are formed of, for example, resin. The multiple degassing elements 2 are fixed by the first sealing portion 4 and the second sealing portion 5, so that they extend in the extension direction D1 and are arranged side by side in a direction perpendicular to the extension direction D1.

[0042] The interior region of the housing 3 is divided by the first sealing 4 and the second sealing 5, with the hollow fiber membranes 22 of each of the degassing elements 2 as boundaries, into an interior region R1 including the hollow portions 22a of each of the hollow fiber membranes 22, and an exterior region R2 not including the hollow portions 22a of each of the hollow fiber membranes 22. The exterior region R2 is a liquid phase region to which the liquid L is supplied. The interior region R1 is a gas phase region through which gas degassed from the liquid L flows. The exterior region R2 includes the liquid flow passages 21a of the liquid flow pipe 21 and the region outside the hollow fiber membranes 22 between the first sealing 4 and the second sealing 5 within the tubular portion 31.

[0043] A liquid collection region R3 is formed between the first sealing portion 4 and the second sealing portion 5 in the extension direction D1 within the tubular portion 31. The liquid collection region R3 is a region in which the degassing elements 2 are not disposed and which extends in the extension direction D1 in order to collect the liquid that has come out from the openings 21d of the liquid circulation pipes 21 of each of the degassing elements 2.

[0044] The liquid collection region R3 has a cross-sectional area larger than that of each of the multiple degassing elements 2 in a cross section perpendicular to the extension direction D1 (cross-section shown in FIG. 2). Furthermore, the liquid collection region R3 has a convex cross-section with a cross-sectional area larger than that of each of the multiple degassing elements in a cross-section perpendicular to the extension direction D1. A convex shape is a shape that has the property that any two points selected are completely contained within the shape. In other words, a convex shape is a shape that does not have any recesses. Examples of such convex shapes include a circle, an ellipse, and a convex polygon in which all interior angles are less than 180 degrees. Examples of convex polygons include regular polygons such as an equilateral triangle, a square, and a regular pentagon, as well as a triangle.

[0045] The liquid collection region R3 is a region adjacent to at least one of the multiple degassing elements 2. In this embodiment, the liquid collection region R3 is located at the center of the tubular portion 31, and all of the degassing elements 2 are arranged in a circle surrounding the liquid collection region R3. Therefore, the liquid collection region R3 is a region adjacent to all of the degassing elements 2. The center of the tubular portion 31 refers to the center of the tubular portion 31 in a cross section (cross section shown in FIG. 2) perpendicular to the extension direction D1.

[0046] A first end communicating space S1 is formed on the first extending direction D21 side of the first sealing portion 4, the first end communicating space S1 communicating with the hollow portions 22a of the hollow fiber membranes 22 of each of the degassing elements 2. Furthermore, a second end communicating space S2 is formed on the second extending direction D22 side of the degassing element 2, the second end communicating space S2 communicating with the hollow portions 22a of the hollow fiber membranes 22 of each of the degassing elements 2. The first end communicating space S1 and the second end communicating space S2 are also part of the internal region R1.

[0047] The first end communication space S1 is a space formed by the first lid portion 32 and is a space surrounded by the first fixing portion 24, the first sealing portion 4, and the first lid portion 32 of the degassing element 2. The first end communication space S1 is a space adjacent to the multiple degassing elements 2 on the side in the first extending direction D21. The first end communication space S1 is a space adjacent to each of the first end hollow fiber membrane openings 22b of the multiple hollow fiber membranes 22 of each of the multiple degassing elements 2.

[0048] The second end communication space S2 is a space formed by the second lid portion 33, and is a space surrounded by the second fixing portion 25, the second sealing portion 5, and the second lid portion 33 of the degassing element 2. The second end communication space S2 is a space adjacent to the second end portion 2b of the degassing element 2 on the side in the second extending direction D22. The second end communication space S2 is a space adjacent to each second end hollow fiber membrane opening 22c of each of the plurality of hollow fiber membranes 22 of the plurality of degassing elements 2.

[0049] The housing 3 has a liquid supply port 35 that connects the inside and outside of the housing 3, a liquid discharge port 36 that connects the inside and outside of the housing 3, a first end gas port 37 that connects the inside and outside of the housing 3, and a second end gas port 38 that connects the inside and outside of the housing 3.

[0050] The liquid supply port 35 is a port for supplying the liquid L to the liquid flow passages 21a of each of the multiple degassing elements 2. The liquid supply port 35 has an inlet 35a provided in the second cover portion 33 and multiple liquid supply pipe sections 35b connected to the end sections 21f of the liquid flow pipes 21 of each of the multiple degassing elements 2 on the second extension direction D22 side. The liquid supply port 35 opens, at the multiple liquid supply pipe sections 35b, to the liquid flow passages 21a of the liquid flow pipes 21 of each of the multiple degassing elements 2. Therefore, by supplying the liquid L to the inlet 35a, the liquid can be supplied to the liquid flow passages 21a of the liquid flow pipes 21 of each of the multiple degassing elements 2 from the end sections 21f on the second extension direction D22 side.

[0051] The liquid discharge port 36 is a port for discharging the liquid L that has come out from the multiple openings 21d of the liquid distribution pipes 21 of each of the multiple degassing elements 2. The liquid discharge port 36 has an outlet 36a provided in the first cover portion 32 and a liquid discharge pipe portion 36b connected to the first sealing portion 4. The liquid discharge port 36 opens from the first sealing portion 4 to the liquid collection region R3 at the liquid discharge pipe portion 36b. In other words, a through-hole is formed in the first sealing portion 4 at a position adjacent to the liquid collection region R3, and the liquid discharge pipe portion 36b opens from this through-hole in the first sealing portion 4 to the liquid collection region R3.

[0052] The first-end gas port 37 is a gas port for discharging gas G that has permeated through the plurality of hollow fiber membranes 22 of each of the plurality of degassing elements 2. The first-end gas port 37 is provided in the first lid portion 32 and opens into the first-end communicating space S1. As a result, the first-end gas port 37 is in communication with each of the hollow portions 22a of the plurality of hollow fiber membranes 22 of each of the plurality of degassing elements 2.

[0053] The second-end gas port 38 is a gas port for discharging the gas G that has permeated through the plurality of hollow fiber membranes 22 of each of the plurality of degassing elements 2. The second-end gas port 38 is provided in the second lid portion 33 and opens into the second-end communication space S2. As a result, the second-end gas port 38 is in communication with each of the hollow portions 22a of the plurality of hollow fiber membranes 22 of each of the plurality of degassing elements 2.

[0054] The liquid supply port 35 , the liquid discharge port 36 , the first end gas port 37 , and the second end gas port 38 may be configured integrally with the housing 3 or may be configured as separate members from the housing 3 .

[0055] [Method for degassing liquids] Next, a description will be given of a method for degassing the liquid L using the degassing module 1. Here, as an example of a method for degassing the liquid L, a method for degassing the liquid L in a vacuum mode will be described.

[0056] In this degassing method, the first end gas port 37 and the second end gas port 38 of the degassing module 1 are suctioned, and the liquid L is supplied to the liquid supply port 35 of the degassing module 1. The suction of the first end gas port 37 and the second end gas port 38 can be performed, for example, by connecting a suction device (not shown) such as a vacuum pump to the first end gas port 37 and the second end gas port 38 via piping or the like and activating this suction device. The supply of the liquid L to the liquid supply port 35 can be performed, for example, by connecting the liquid supply port 35 to a liquid supply device (not shown) such as a liquid feed pump that sends out the liquid L via piping or the like and activating this liquid supply device.

[0057] When suction is applied to the first-end gas port 37 and the second-end gas port 38, the hollow portions 22a of the hollow fiber membranes 22 of each of the degassing elements 2 connected to the first-end gas port 37 and the second-end gas port 38 are suctioned and reduced in pressure. Furthermore, when liquid L is supplied to the liquid supply port 35, the liquid L is supplied to the liquid flow passages 21a of the liquid circulation pipes 21 of each of the degassing elements 2. In each of the degassing elements 2, the liquid L exits through the openings 21d of the liquid circulation pipes 21 and comes into contact with the hollow fiber membranes 22. Because the hollow portions 22a of the hollow fiber membranes 22 are reduced in pressure, gas G, such as dissolved gas in the liquid L and bubbles contained in the liquid L, permeates the hollow fiber membranes 22. This degasses the liquid L. The liquid L degassed in each of the degassing elements 2 is collected in the liquid collection region R3 and discharged from the liquid discharge port 36. The gas G that has permeated through the multiple hollow fiber membranes 22 of each of the multiple degassing elements 2 passes through the first end communicating space S1 and the second end communicating space S2 and is discharged from the first end gas port 37 and the second end gas port 38.

[0058] As described above, in the degassing module 1 according to this embodiment, a liquid collection region R3 extending in the extension direction D1 without multiple degassing elements 2 is formed between the first sealing portion 4 and the second sealing portion 5 in the extension direction D1 within the cylindrical portion 31, and the liquid discharge port 36 opens into the liquid collection region R3. Therefore, even if a region for collecting the liquid L from each of the multiple degassing elements 2 is not provided on the first extension direction D11 side of the multiple degassing elements 2, the liquid L from each of the multiple degassing elements 2 can be collected and discharged. This allows the length of the degassing module 1 in the extension direction D1 to be shortened. Furthermore, the liquid L from each of the multiple degassing elements 2 can be collected and discharged over the entire length of the multiple degassing elements 2 without passing through narrow gaps between the multiple degassing elements 2. This reduces the pressure loss of the liquid L.

[0059] In addition, in this degassing module 1, the liquid collection area R3 has a larger cross-sectional area than each of the multiple degassing elements 2 in a cross section perpendicular to the extension direction D1, so that the liquid L coming out from each of the multiple degassing elements 2 tends to collect in the liquid collection area.

[0060] In addition, in this degassing module 1, the liquid collection area R3 has a convex cross-section perpendicular to the extension direction D1 with a cross-sectional area larger than that of each of the multiple degassing elements 2, so that the liquid L coming out from each of the multiple degassing elements 2 tends to collect in the liquid collection area.

[0061] Furthermore, in this degassing module 1, the liquid collection region R3 is located in the center of the cylindrical portion 31, so that the liquid L coming out of each of the multiple degassing elements 2 tends to collect in the liquid collection region.

[0062] Furthermore, in this degassing module 1, the liquid discharge port 36 is connected to the first sealing portion 4 and opens from the first sealing portion 4 to the liquid collection region R3, so that the liquid L that has collected in the liquid collection region R3 can be efficiently discharged.

[0063] In this degassing module 1, a first lid portion 32 and a second lid portion 33 are connected to both ends of the tubular portion 31 in the extension direction D1, and a first end gas port 37 and a second end gas port 38 are provided in the first lid portion 32 and the second lid portion 33 and open to the first end communicating space S1 and the second end communicating space S2. Therefore, the hollow portions 22a of the multiple hollow fiber membranes 22 of the multiple degassing elements 2 can be efficiently sucked from the first end gas port 37 and the second end gas port 38.

[0064] In the liquid degassing method according to this embodiment, in the degassing module 1, the hollow portions 22a of the plurality of hollow fiber membranes 22 of the plurality of degassing elements 2 are suctioned and the liquid L is supplied to the liquid supply port 35, thereby degassing the liquid L. This makes it possible to shorten the length of the degassing module 1 in the extension direction D1 and reduce the pressure loss of the liquid L.

[0065] 2, the interval (separation distance) between the hollow fiber membrane bundles 23 of the plurality of degassing elements 2 is defined as interval A, and the outer diameter of each of the plurality of degassing elements 2 is defined as outer diameter B. The inventors used the k-ε function as a turbulent viscosity model for Examples 1 to 5 in which the relationship between interval A and outer diameter B in the degassing module 1 was varied, and assumed that the hollow fiber membrane bundles, which generate resistance when water is passed through, are porous. 3 A simulation was performed to simulate the flow of liquid L on the outer peripheral surface of the hollow fiber membrane bundle 23 when liquid L was supplied to the liquid supply port 35 at a flow rate of 1 / h. In Example 1, the ratio of the spacing A to the outer diameter B (A / B) was set to 0.045. In Example 2, the ratio of the spacing A to the outer diameter B (A / B) was set to 0.090. In Example 3, the ratio of the spacing A to the outer diameter B (A / B) was set to 0.125. In Example 4, the ratio of the spacing A to the outer diameter B (A / B) was set to 0.161. In Example 5, the ratio of the spacing A to the outer diameter B (A / B) was set to 0.225. The outer peripheral surfaces of the semicircular portions located toward the center of the tubular portion 31 of the hollow fiber membrane bundles 23 in all degassing elements 2 were collectively defined as a target outer peripheral surface, and the maximum flow velocity V and flow rate Q of liquid L on this target outer peripheral surface were calculated. The results are shown in Tables 1 and 2 and FIG. 5.

[0066] [Table 1]

[0067] [Table 2]

[0068] As shown in Table 1, in Example 1 where the ratio (A / B) of the spacing A to the outer diameter B was 0.045, the maximum flow velocity V of the liquid L on the outer surface of the hollow fiber membrane bundle 23 was 1.25 m / s. In contrast, in Examples 2 to 5 where the ratio (A / B) of the spacing A to the outer diameter B was 0.09 or more, the maximum flow velocity V of the liquid L on the outer surface of the hollow fiber membrane bundle 23 was 0.57 m / s or less, which was significantly lower than in Example 1.

[0069] FIG. 5 is a graph showing the simulation results for Examples 1 to 5, illustrating the relationship between the ratio (A / B) of the spacing A to the outer diameter B and the flow rate Q of the liquid L at the target outer peripheral surface. The theoretical value of the flow rate Q of the liquid L at the target outer peripheral surface is 41.667 kg / s. The theoretical value of the flow rate Q of the liquid L at the target outer peripheral surface is the flow rate of the liquid at the target outer peripheral surface when the liquid L flows uniformly from all outer peripheral surfaces of the hollow fiber membrane bundles 23 in all degassing elements 2. In FIG. 5, this theoretical value is indicated by a dashed line. As shown in Table 2 and FIG. 5, in Example 1, where the ratio (A / B) of the spacing A to the outer diameter B is 0.045, the flow rate Q of the liquid L at the target outer peripheral surface was 43.2 kg / s, significantly exceeding the theoretical value. In contrast, in Examples 2 to 5, where the ratio (A / B) of the spacing A to the outer diameter B is 0.09 or greater, the flow rate Q of the liquid L at the target outer peripheral surface was 42.0 kg / s or less, significantly lower than in Example 1.

[0070] From these results, it was found that by setting the ratio (A / B) of the spacing A to the outer diameter B to 0.09 or more, it is possible to suppress an increase in the local flow velocity and flow rate of the liquid L, thereby suppressing the uneven flow of the liquid L.

[0071] Therefore, the spacing A between the hollow fiber membrane bundles 23 of the multiple degassing elements 2 can be set to at least 0.09 times, preferably at least 0.10 times, and more preferably at least 0.13 times the outer diameter B of each of the multiple degassing elements 2. For example, if the outer diameter B of each of the multiple degassing elements 2 is 222 mm, the spacing A between the hollow fiber membrane bundles 23 of the multiple degassing elements 2 can be set to at least 20 mm, preferably at least 25 mm, and more preferably at least 30 mm.

[0072] The spacing A between the hollow fiber membrane bundles 23 of the multiple degassing elements 2 is the smallest spacing between the hollow fiber membrane bundles 23 of the multiple degassing elements 2. Therefore, if the spacing A between the hollow fiber membrane bundles 23 of the multiple degassing elements 2 is different, the spacing A between the hollow fiber membrane bundles 23 of the multiple degassing elements 2 will be the spacing A between the degassing elements 2 with the smallest spacing.

[0073] The outer diameter B of each of the multiple degassing elements 2 refers to the outer diameter of each of the multiple degassing elements 2 in a cross section perpendicular to the extension direction D1. The outer diameter B of each of the multiple degassing elements 2 is the maximum outer diameter of each of the multiple degassing elements 2. Therefore, if the outer diameters B of each of the multiple degassing elements 2 are different, the outer diameter B of the degassing element 2 with the largest outer diameter is the outer diameter B.

[0074] In this way, when the spacing A between the hollow fiber membrane bundles 23 of the plurality of degassing elements 2 is 0.09 or more times, preferably 0.10 or more times, and more preferably 0.13 or more times the outer diameter B of each of the plurality of degassing elements 2, it is possible to prevent the flow velocity and flow rate of the liquid L between the degassing elements 2 from becoming locally excessive. This makes it possible to prevent uneven flow of the liquid L around the degassing elements 2, thereby reducing the pressure loss of the liquid L and improving the degassing efficiency.

[0075] Although the preferred embodiments of the present disclosure have been described above, the present disclosure is not limited to the above embodiments.

[0076] For example, in the above embodiment, the liquid discharge port is described as being connected to the first sealing portion and opening from the first sealing portion to the liquid collection area, but the liquid discharge port may also be connected to either the first sealing portion or the second sealing portion and opening from either the first sealing portion or the second sealing portion to the liquid collection area.

[0077] Furthermore, in the above embodiment, the liquid collection area is described as being located in the center of the cylindrical portion, but the liquid collection area may be located at any position on the cylindrical portion.

[0078] FIG. 6 is a schematic cross-sectional view of a degassing module of a modified example. FIG. 7 is a schematic cross-sectional view taken along line VII-VII in FIG. 6. In the degassing module 1A of the modified example shown in FIGS. 6 and 7, the liquid collection region R3 is formed adjacent to the tubular portion 31. Therefore, the liquid collection region R3 is sandwiched between the multiple degassing elements 2 and the tubular portion 31. A liquid discharge port 36A for discharging the liquid L leaking from the multiple openings 21d of the liquid circulation pipes 21 of the multiple degassing elements 2 is provided in the tubular portion 31A of the housing 3A, which corresponds to the tubular portion 31 of the housing 3 of the above embodiment. The liquid discharge port 36A opens from the tubular portion 31A to the liquid collection region R3. In other words, a through-hole is formed in the tubular portion 31A at a position adjacent to the liquid collection region R3, and the liquid discharge port 36A opens from the through-hole of the tubular portion 31A to the liquid collection region R3. Note that a first cover portion 32A, which corresponds to the first cover portion 32 of the above embodiment, does not have a liquid discharge port.

[0079] In this way, when the liquid collection region R3 is adjacent to the tubular portion 31A, it is possible to easily arrange multiple degassing elements 2. In this case, by providing the liquid discharge port 36A in the tubular portion 31A, the liquid L that has collected in the liquid collection region R3 can be efficiently discharged.

[0080] In addition, in the modified degassing module 1A shown in Figures 6 and 7, the liquid discharge port may be connected to either the first sealing portion or the second sealing portion and open to the liquid collection area from either the first sealing portion or the second sealing portion.

[0081] The number and arrangement of the degassing elements are not particularly limited. For example, as in the degassing module 1B of a modified example shown in FIG. 8(a), five degassing elements 2 may be arranged in a circle surrounding the liquid collection region R3 located at the center of the tubular portion 31. As in the degassing module 1C of a modified example shown in FIG. 8(b), four degassing elements 2 may be arranged in a circle surrounding the liquid collection region R3 located at the center of the tubular portion 31. As in the degassing module 1D of a modified example shown in FIG. 8(c), three degassing elements 2 and three degassing elements 2 may be arranged to sandwich the liquid collection region R3 located at the center of the tubular portion 31. As in the degassing module 1E of a modified example shown in FIG. 8(d), five degassing elements 2 may be arranged in a C-shape surrounding the liquid collection region R3 adjacent to the tubular portion 31A. In the degassing module 1E of the modified example shown in Fig. 8(d), a liquid discharge port 36A is provided in the tubular portion 31A and opens from the tubular portion 31A to the liquid collection region R3, similar to the degassing module 1A of the modified example shown in Fig. 6 and Fig. 7. Fig. 8(a), Fig. 8(b), Fig. 8(c), and Fig. 8(d) are schematic cross-sectional views showing the degassing modules of the modified examples.

[0082] Furthermore, the size of each of the multiple degassing elements is not particularly limited. For example, as in the degassing module 1F of a modified example shown in Figure 9(a), six degassing elements 2 with small outer diameters may be arranged in a circle to surround the liquid collection region R3 located in the center of the tubular portion 31. As in the degassing module 1G of a modified example shown in Figure 9(b), three degassing elements 2 with large outer diameters and three degassing elements 2 with small outer diameters may be arranged in a circle to surround the liquid collection region R3 located in the center of the tubular portion 31. As in the degassing module 1H of a modified example shown in Figure 9(c), three degassing elements 2 with large outer diameters and three degassing elements 2 with small outer diameters may be arranged to sandwich the liquid collection region R3 located in the center of the tubular portion 31. Alternatively, as in the degassing module 1I of a modified example shown in FIG. 9(d), three degassing elements 2 with larger outer diameters and three degassing elements 2 with smaller outer diameters may be arranged in a C-shape to surround the liquid collection region R3 adjacent to the tubular portion 31A. In the degassing module 1I of the modified example shown in FIG. 9(d), similar to the degassing module 1A of the modified examples shown in FIGS. 6 and 7, a liquid discharge port 36A is provided in the tubular portion 31A and opens from the tubular portion 31A to the liquid collection region R3. FIGS. 9(a), 9(b), 9(c), and 9(d) are schematic cross-sectional views that schematically show degassing modules of the modified examples. By including multiple degassing elements 2 with different outer diameters, the arrangement of the liquid collection region R3, the spacing between the multiple degassing elements 2, and the like can be easily adjusted. [Explanation of symbols]

[0083] 1... degassing module, 1A... degassing module, 1B... degassing module, 1C... degassing module, 1D... degassing module, 1E... degassing module, 1F... degassing module, 1G... degassing module, 1H... degassing module, 1I... degassing module, 2... degassing element, 2a... first end, 2b... second end, 3... housing, 3A... housing, 4... first sealing portion, 5... second sealing portion, 21... liquid distribution pipe, 21a... liquid distribution passage, 21b... first end liquid distribution pipe opening, 21c... second end liquid distribution pipe opening, 21d... opening, 21e... end, 21f... end, 22... hollow fiber membrane, 22a... hollow portion, 22b... first end hollow fiber membrane opening, 22c... second end hollow fiber membrane opening, 23... center Empty fiber membrane bundle, 24...first fixing part, 25...second fixing part, 26...blocking part, 31...tube part, 31A...tube part, 32...first lid part, 32A...first lid part, 33...second lid part, 35...liquid Supply port, 35a...Inlet, 35b...Liquid supply pipe section, 36...Liquid discharge port, 36a...Outlet, 36b...Liquid discharge pipe section, 36A...Liquid discharge port, 37...No. One end gas port, 38...second end gas port, A...distance, B...outer diameter, D1...extending direction, D2...extending direction, D11...first extending direction, D12...second extending direction, D21...th one extension direction, D22...second extension direction, G...gas, L...liquid, R1...internal region, R2...external region, R3...liquid collection region, S1...first end communication space, S2...second end communication space.

Claims

1. a plurality of degassing elements each having a liquid flow pipe in which a plurality of openings are formed to form a liquid flow passage therein, and a hollow fiber membrane bundle in which a plurality of hollow fiber membranes are arranged around the liquid flow pipe so as to cover the plurality of openings; a cylindrical portion extending in an extension direction and accommodating the plurality of degassing elements; a first sealing portion that seals between a first end portion, which is an end portion on one side of each of the plurality of degassing elements, and the cylindrical portion; a second sealing portion disposed opposite to the first sealing portion in the extending direction and sealing a gap between a second end portion of each of the plurality of degassing elements opposite to the first end portion and the cylindrical portion; a closing portion that closes an end portion of the liquid circulation pipe of each of the plurality of degassing elements in a first extension direction, which is one of the extension directions; a liquid supply port connected to an end of the liquid flow pipe of each of the plurality of degassing elements on a second extension direction side, the second extension direction being opposite to the first extension direction, and configured to supply liquid to the liquid flow passage of each of the plurality of degassing elements; a liquid discharge port for discharging the liquid exiting from the plurality of openings of the liquid flow pipes of each of the plurality of degassing elements; a liquid collection region is formed between the first sealing portion and the second sealing portion in the extension direction within the cylindrical portion, the liquid collection region not including the degassing elements, and extending in the extension direction, in order to collect liquid that has come out from the plurality of openings of the liquid circulation pipes of each of the plurality of degassing elements; The liquid discharge port opens into the liquid collection area. Degassing module.

2. the liquid collecting region has a cross-sectional area larger than each of the plurality of degassing elements in a cross section perpendicular to the extension direction; The degassing module of claim 1 .

3. the liquid collecting area has a convex cross section perpendicular to the extension direction, the cross section having a larger cross-sectional area than each of the plurality of degassing elements; The degassing module of claim 1 .

4. The liquid collection area is located at the center of the cylindrical portion. The degassing module of claim 1 .

5. The liquid collection area is adjacent to the cylindrical portion. The degassing module of claim 1 .

6. the liquid discharge port is connected to either the first sealing portion or the second sealing portion and opens from either the first sealing portion or the second sealing portion to the liquid collection area; The degassing module according to claim 4.

7. The liquid discharge port is provided in the cylindrical portion. The degassing module according to claim 5 .

8. the intervals between the hollow fiber membrane bundles of the plurality of degassing elements are 0.09 times or more the outer diameter of each of the plurality of degassing elements; The degassing module of claim 1 .

9. The plurality of degassing elements have degassing elements with different outer diameters. The degassing module of claim 1 .

10. a first lid portion connected to an end portion of the cylindrical portion on the first extension direction side and forming a first end communication space communicating with hollow portions of the plurality of hollow fiber membranes; a second cover portion connected to an end portion of the cylindrical portion on the second extension direction side and forming a second end communication space that communicates with the hollow portions of the plurality of hollow fiber membranes; a gas port for discharging gas that has permeated through the plurality of hollow fiber membranes of each of the plurality of degassing elements; the gas port is provided in at least one of the first lid portion and the second lid portion, and is open to at least one of the first end communicating space and the second end communicating space; The degassing module of claim 1 .

11. A method for degassing a liquid using the degassing module according to any one of claims 1 to 10, comprising: suctioning the hollow portions of the hollow fiber membranes of each of the degassing elements and supplying liquid to the liquid supply port; How to degas a liquid.

Images