Degassing module and liquid degassing method

Abstract

This degassing module comprises: a pipe in which a plurality of holes are formed; a hollow fiber membrane bundle in which a plurality of hollow fiber membranes extending along the extension direction of the pipe are bundled and arranged around the pipe so as to cover the plurality of holes; a housing which houses the pipe and the hollow fiber membrane bundle so that a space is formed between the hollow fiber membrane bundle and the housing; a partition part which partitions an area in the housing into an internal area including the hollow part of each of the plurality of hollow fiber membranes and an external area including an inter-membrane space between the plurality of hollow fiber membranes; and a baffle which is arranged in the inter-membrane space and extends in a direction crossing the extension direction.

Description

[Technical Field]

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

[0002] Degassing modules that degas a liquid using multiple hollow fiber membranes have been known for some time. One example of such a degassing module is the contactor shown in FIG. 4 of Patent Document 1. This contactor includes a perforated pipe, multiple hollow fiber membranes surrounding the pipe, a pair of tube sheets that secure the ends of the multiple hollow fiber membranes to the pipe, a shell that houses the multiple hollow fiber membranes, an air inlet formed in the shell, and a liquid outlet (housing liquid inlet / outlet) formed between the pair of tube sheets in the shell. When liquid is supplied through the liquid inlet (pipe liquid inlet / outlet) of the pipe, the liquid exits the holes in the pipe, passes through the intermembrane spaces between the multiple hollow fiber membranes, and is discharged through the liquid outlet. At this time, vacuum suction is applied to the lumen of the hollow fiber membranes through the air inlet, moving entrained gas in the liquid toward the lumen of the hollow fiber membranes, and degassing the liquid. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-038904 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when the present inventor analyzed a degassing module in which liquid coming out of a hole in a pipe passes through the intermembrane spaces between multiple hollow fiber membranes and is discharged from a housing liquid supply / discharge port, he found that there was variation in the flow rate of the liquid within the housing. When variation in the flow rate of the liquid within the housing occurs, there is a possibility that sufficient degassing performance cannot be obtained.

[0005] Therefore, an object of the present disclosure is to provide a degassing module and a method for degassing a liquid that can reduce variations in the flow rate of the liquid within the housing. [Means for solving the problem]

[0006] The present inventors conducted further intensive research into the above-mentioned problem and found that the liquid flow rate was low at positions far from the housing liquid inlet / outlet port and high at positions close to the housing liquid inlet / outlet port. From these results, the following was inferred. Specifically, because multiple hollow fiber membranes extend along the pipe extension direction, in the intermembrane space, the fluid resistance in the pipe extension direction is likely to be lower than the fluid resistance in the pipe radial direction. Therefore, it is inferred that a drift occurred in the intermembrane space, where the liquid flowed in the pipe extension direction rather than the pipe radial direction, resulting in a variation in the liquid flow rate within the housing. Furthermore, even when the liquid flow is reversed, supplying the liquid through the housing liquid inlet / outlet port and discharging the liquid through the pipe liquid inlet / outlet port, the liquid passes through the intermembrane space, which is inferred to cause a drift in the intermembrane space and result in a variation in the liquid flow rate within the housing. Furthermore, it is presumed that the tensile force of the liquid discharged from the housing liquid supply / discharge port caused the above-mentioned drift to occur more strongly at positions farther from the housing liquid supply / discharge port than at positions closer to the housing liquid supply / discharge port. Based on this, it was discovered that by obstructing the flow of liquid in the direction of extension of the pipe in the intermembrane spaces between multiple hollow fiber membranes, drift of liquid flowing in the direction of extension of the pipe in the intermembrane spaces can be reduced, thereby reducing variation in the liquid flow rate within the housing. The present disclosure is based on the above-mentioned findings.

[0007] [1] A degassing module according to the present disclosure comprises: a pipe having a plurality of holes formed therein; a hollow fiber membrane bundle in which a plurality of hollow fiber membranes extending along the extension direction of the pipe are bundled together and arranged around the pipe to cover the plurality of holes; a housing that accommodates the pipe and the hollow fiber membrane bundle so that a space is formed between the pipe and the hollow fiber membrane bundle; a partition that divides the area within the housing into an internal area including hollow portions of each of the plurality of hollow fiber membranes and an external area including inter-membrane spaces between the plurality of hollow fiber membranes; and a baffle that is arranged in the inter-membrane spaces and extends in a direction intersecting the extension direction, wherein the pipe has a pipe inlet / outlet formed at one end and open to the outside of the housing, and a pipe seal that seals the pipe at the other end, and the housing has an air inlet connected to the internal area and a housing inlet / outlet connected to the external area.

[0008] In this degassing module, when liquid is supplied to the pipe through the pipe inlet / outlet, the liquid exits the pipe through the multiple holes, passes through the intermembrane spaces between the multiple hollow fiber membranes, and is discharged through the housing inlet / outlet. When liquid is supplied into the housing through the housing inlet / outlet, the liquid passes through the intermembrane spaces between the multiple hollow fiber membranes, enters the inside of the pipe through the multiple holes in the pipe, and is discharged through the pipe inlet / outlet. The liquid can be degassed by suctioning air into the internal region through the air inlet. Because the multiple hollow fiber membranes extend along the extension direction, a drift in the intermembrane space occurs, where the liquid flows in the extension direction. However, because a baffle extending in a direction intersecting the extension direction is disposed in the intermembrane space, the baffle inhibits the flow of liquid in the extension direction in the intermembrane space. When liquid is supplied to the pipe through the pipe inlet / outlet, the baffle can mitigate the effect of the tensile force of the liquid discharged through the housing inlet / outlet. This reduces the uneven flow of liquid in the intermembrane space in the extension direction, thereby reducing variations in the flow rate of the liquid within the housing, thereby improving degassing performance.

[0009] [2] In the degassing module described in [1] above, the baffle may extend in a circumferential direction of the pipe. In this degassing module, since the baffle extends in the circumferential direction, the flow of liquid in the intermembrane space in the extension direction can be effectively obstructed.

[0010] [3] In the degassing module described in [2] above, the baffle may extend over the entire intermembrane space in the circumferential direction. In this degassing module, since the baffle extends over the entire intermembrane space in the circumferential direction, the flow of liquid in the intermembrane space in the extending direction can be inhibited over the entire circumferential direction.

[0011] [4] In the degassing module described in [2] above, the baffle may be provided in a portion of the intermembrane space in the circumferential direction. In this degassing module, the baffle is provided in a portion of the intermembrane space in the circumferential direction, so that the baffle is provided in the circumferential portion where the liquid flows easily in the extension direction and is not provided in the circumferential portion where the liquid flows poorly in the extension direction, thereby effectively obstructing the flow of liquid in the intermembrane space in the extension direction and reducing the material cost of the baffle.

[0012] [5] In the degassing module described in [1], [2], or [4] above, the baffle is provided on the housing liquid inlet / outlet port side of the pipe as viewed from the extension direction, and does not have to be provided on the opposite side of the pipe from the housing liquid inlet / outlet port as viewed from the extension direction. In the intermembrane space, liquid tends to flow more easily in the extension direction on the housing liquid inlet / outlet port side of the pipe as viewed from the extension direction. In this degassing module, the baffle is provided on the housing liquid inlet / outlet port side of the pipe as viewed from the extension direction, and is not provided on the opposite side of the pipe from the housing liquid inlet / outlet port as viewed from the extension direction. This effectively obstructs the flow of liquid in the intermembrane space in the extension direction, while reducing the material cost of the baffle.

[0013] [6] In the degassing module according to any one of the above [1] to [5], the baffle may extend in a radial direction of the pipe. In this degassing module, since the baffle extends in the radial direction, it is possible to effectively inhibit the flow of liquid in the intermembrane space in the extending direction. [7] In the degassing module described in [6] above, the baffle may extend across the entire intermembrane space in the radial direction. In this degassing module, since the baffle extends across the entire intermembrane space in the radial direction, it is possible to inhibit the flow of liquid in the intermembrane space in the extending direction across the entire radial direction.

[0014] [8] In the degassing module described in [6] above, the baffle may be provided in a portion of the intermembrane space in the radial direction. In this degassing module, the baffle is provided in a portion of the intermembrane space in the radial direction, and therefore, by providing the baffle in a radial portion where the liquid flows easily in the extension direction and not providing the baffle in a radial portion where the liquid flows less easily in the extension direction, it is possible to reduce the material cost of the baffle while effectively obstructing the flow of liquid in the intermembrane space in the extension direction.

[0015] [9] In the degassing module according to any one of the above [1] to [8], the baffle may extend from the pipe to the end of the intermembrane space opposite the pipe. In this degassing module, the baffle extends from the pipe to the end of the intermembrane space opposite the pipe, so that the flow of liquid in the intermembrane space in the extending direction can be more effectively inhibited.

[0016]

[10] In the degassing module described in any one of [1] to [8] above, the baffle may extend from a position spaced apart from the pipe to the end of the intermembrane space opposite the pipe. In the intermembrane space, the liquid tends to flow more easily in the extending direction the further away from the pipe. In this degassing module, the baffle extends from a position spaced apart from the pipe to the end of the intermembrane space opposite the pipe, thereby effectively obstructing the flow of liquid in the extending direction in the intermembrane space and reducing the material cost of the baffle.

[0017]

[11] In the degassing module according to any one of [1] to

[10] above, the baffle may extend in a direction inclined relative to the radial direction of the pipe. In this degassing module, since the baffle extends in a direction inclined relative to the radial direction, the flow of liquid obstructed by the baffle can be directed in the direction of the inclination of the baffle. This makes it possible to control the flow of liquid within the housing.

[0018]

[12] In the degassing module described in any one of [1] to

[11] above, the partition may include a first sealing portion that holds one end of the hollow fiber membrane bundle and seals the space between the pipe, the housing, and the hollow fiber membranes, and a second sealing portion that is disposed on the opposite side of the first sealing portion from the pipe inlet / outlet port in the extension direction and holds the other end of the hollow fiber membrane bundle and seals the space between the pipe, the housing, and the hollow fiber membranes, and the holes in the pipe may be formed between the first sealing portion and the second sealing portion in the extension direction. In this degassing module, the first sealing portion and the second sealing portion arrange the hollow fiber membranes so that they extend along the extension direction. The first sealing portion and the second sealing portion each seal the space between the pipe, the housing, and the hollow fiber membranes, and the first sealing portion and the second sealing portion can divide the area inside the housing into an inner area and an outer area.

[0019]

[13] In the degassing module described in

[12] above, the housing liquid inlet / outlet port may be located near the second seal, and the baffle may be located on the pipe liquid inlet / outlet side of the housing liquid inlet / outlet port in the extension direction. In this degassing module, because the housing liquid inlet / outlet port is located near the second seal, liquid can be brought into contact with the plurality of hollow fiber membranes over a long range in the extension direction. Furthermore, because the baffle is located on the pipe liquid inlet / outlet side of the housing liquid inlet / outlet port in the extension direction, when liquid is supplied to the pipe from the pipe liquid inlet / outlet port, the flow of liquid in the extension direction from the pipe liquid inlet / outlet side toward the housing liquid inlet / outlet can be obstructed.

[0020]

[14] In the degassing module described in

[13] above, the baffle may be disposed in a region closer to the housing liquid inlet / drain port when the region between the first sealing portion and the housing liquid inlet / drain port in the extension direction is divided into two equal parts. In this degassing module, the baffle is disposed in a region closer to the housing liquid inlet / drain port when the region between the first sealing portion and the housing liquid inlet / drain port in the extension direction is divided into two equal parts. Therefore, when liquid is supplied to a pipe from the pipe liquid inlet / drain port, the influence of the pulling force of the liquid discharged from the housing liquid inlet / drain port can be alleviated at a position close to the housing liquid inlet / drain port. This makes it possible to effectively suppress drift of the liquid caused by the pulling force of the liquid discharged from the housing liquid inlet / drain port.

[0021]

[15] In the degassing module described in

[13] or

[14] above, the baffle may be disposed near the housing liquid inlet / outlet port. In this degassing module, since the baffle is disposed near the housing liquid inlet / outlet port, when liquid is supplied to the pipe from the pipe liquid inlet / outlet port, the influence of the pulling force of the liquid discharged from the housing liquid inlet / outlet port can be alleviated near the housing liquid inlet / outlet. This makes it possible to more effectively suppress the drift of the liquid caused by the pulling force of the liquid discharged from the housing liquid inlet / outlet port.

[0022]

[16] In the degassing module described in any one of

[13] to

[15] above, the baffle may extend in the extension direction away from the housing liquid inlet / outlet port as it moves away from the pipe. In this degassing module, since the baffle extends in the extension direction away from the housing liquid inlet / outlet port as it moves away from the pipe, when liquid is supplied to the pipe from the pipe liquid inlet / outlet port, the liquid flowing in the extension direction in the intermembrane space can be first directed away from the housing liquid inlet / outlet port and then directed toward the housing liquid inlet / outlet port. This allows the contact distance between the liquid and the multiple hollow fiber membranes to be increased.

[0023]

[17] The degassing module according to any one of [1] to

[16] above may further comprise a second baffle disposed in the intermembrane space and extending in a direction intersecting the extension direction, the second baffle being disposed at a different position in the extension direction from the baffle. In this degassing module, the second baffle disposed in the intermembrane space and extending in a direction intersecting the extension direction is disposed at a different position in the extension direction from the baffle, so that the flow of liquid in the intermembrane space in the extension direction is also impeded by the second baffle. This makes it possible to further reduce the variation in the flow rate of the liquid within the housing.

[0024]

[18] In the degassing module described in

[17] above, the second baffle may be disposed on the pipe inlet / outlet side of the baffle in the extension direction. In this degassing module, since the second baffle is disposed on the pipe inlet / outlet side of the baffle in the extension direction, when liquid is supplied to the pipe from the pipe inlet / outlet, the flow of liquid in the extension direction in the intermembrane space can be obstructed further upstream.

[0025]

[19] In the degassing module described in

[17] or

[18] above, the baffle may be disposed on the pipe inlet / outlet side of the housing inlet / outlet in the extension direction, and the second baffle may be disposed on the opposite side of the housing inlet / outlet from the pipe inlet / outlet in the extension direction. In this degassing module, the baffle and the second baffle are disposed on either side of the housing inlet / outlet in the extension direction. Therefore, when liquid is supplied to the pipe from the pipe inlet / outlet, the flow of liquid from the pipe inlet / outlet side toward the housing inlet / outlet in the extension direction can be inhibited, and the flow of liquid from the opposite side of the pipe inlet / outlet toward the housing inlet / outlet in the extension direction can be inhibited. Furthermore, when liquid is supplied into the housing from the housing inlet / outlet, the flow of liquid from the housing inlet / outlet toward the pipe inlet / outlet side can be inhibited, and the flow of liquid from the housing inlet / outlet toward the opposite side of the pipe inlet / outlet can be inhibited.

[0026]

[20] A method for degassing a liquid according to the present disclosure includes, in the degassing module according to any one of [1] to

[19] above, sucking air into the internal region through the air inlet and supplying liquid to the external region through the pipe inlet or the housing inlet. In this method for degassing a liquid, any one of the degassing modules described above is used to degas the liquid, thereby reducing variations in the flow rate of the liquid within the housing and improving degassing performance. [Effects of the Invention]

[0027] According to the present disclosure, it is possible to reduce variations in the flow rate of liquid within a housing. [Brief explanation of the drawings]

[0028] [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]2 is a schematic cross-sectional view showing an enlarged portion of the degassing module shown in FIG. 1. FIG. [Figure 4] 2 is a schematic cross-sectional view showing an enlarged portion of the degassing module shown in FIG. 1. FIG. [Figure 5] 2 is a schematic cross-sectional view showing an enlarged portion of the degassing module shown in FIG. 1. FIG. [Figure 6] 10A to 10C are schematic cross-sectional views illustrating an example of a method for forming a baffle. [Figure 7] FIG. 10 is a schematic cross-sectional view of a degassing module according to a modified example. [Figure 8] FIG. 10 is a schematic cross-sectional view of a degassing module according to a modified example. [Figure 9] FIG. 10 is a schematic cross-sectional view of a degassing module according to a modified example. [Figure 10] FIG. 10 is a schematic cross-sectional view of a degassing module according to a modified example. [Figure 11] FIG. 10 is a schematic cross-sectional view of a degassing module according to a modified example. [Figure 12] FIG. 10 is a schematic cross-sectional view of a degassing module according to a modified example. [Figure 13] FIG. 2 is a schematic cross-sectional view of a degassing module of Comparative Example 1. [Figure 14] 1 is a graph showing simulation results for Examples 1 and 2 and Comparative Example 1. DETAILED DESCRIPTION OF THE INVENTION

[0029] 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 duplicated explanations will be omitted.

[0030] 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. Figs. 3 to 5 are schematic cross-sectional views of enlarged portions of the degassing module shown in Fig. 1. As shown in Figs. 1 to 5, a degassing module 1 according to an embodiment is a module for degassing a liquid L. The liquid L degassed by the degassing module 1 is not particularly limited, but may be, for example, seawater, drinking water, pure water, ultrapure 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.

[0031] The degassing module 1 includes a pipe 2 , a hollow fiber membrane bundle 3 , a housing 4 , a partition 5 , and a baffle 6 .

[0032] The pipe 2 is a cylindrical member that extends linearly along the central axis A. The direction in which the pipe 2 extends cylindrically, i.e., the direction in which the central axis A of the pipe 2 extends, is referred to as the extension direction D1 of the pipe 2, or simply as the extension direction D1. The circumferential direction of the pipe 2, i.e., the direction around the central axis A, is referred to as the circumferential direction D2 of the pipe 2, or simply as the circumferential direction D2. The radial direction of the pipe 2, with the central axis A as the base point, is referred to as the radial direction D3 of the pipe 2, or simply as the radial direction D3.

[0033] The pipe 2 forms an in-pipe flow path 21. The in-pipe flow path 21 is a flow path through which the liquid L can flow, and is formed by the inner circumferential surface of the pipe 2. One end of the pipe 2 in the extension direction D1 is referred to as the first end 2a, and the other end of the pipe 2 in the extension direction D1 is referred to as the second end 2b. The pipe 2 has a pipe supply / discharge port 22 formed at the first end 2a, and a pipe sealing portion 23 that seals the pipe 2 at the second end 2b. In other words, the in-pipe flow path 21 is open at the first end 2a by the pipe supply / discharge port 22, and is sealed at the second end 2b by the pipe sealing portion 23.

[0034] A plurality of holes 24 are formed in the pipe 2. The plurality of holes 24 are holes for allowing the liquid L to flow from the in-pipe flow path 21 to the outside of the pipe 2. The plurality of holes 24 are formed in the peripheral wall of the pipe 2 and open the in-pipe flow path 21 to the outside of the pipe 2.

[0035] The pipe 2 has a hole-formed portion 25 and a non-hole-formed portion 26. The hole-formed portion 25 is a portion where a plurality of holes 24 are formed. The non-hole-formed portion 26 is a portion where a plurality of holes 24 are not formed. The non-hole-formed portion 26 extends along the extension direction D1 from the first end 2a, where the pipe internal flow path 21 is opened by the pipe supply / discharge port 22, toward the second end 2b. The hole-formed portion 25 extends along the extension direction D1 from the non-hole-formed portion 26 to the second end 2b, where the pipe internal flow path 21 is sealed by the pipe sealing portion 23.

[0036] The inner and outer diameters of the hole-forming portion 25 and the non-hole-forming portion 26 are not particularly limited. For example, from the viewpoint of increasing the total area of ​​the plurality of holes 24, the inner and outer diameters of the hole-forming portion 25 may be larger than the inner and outer diameters of the non-hole-forming portion 26. For example, the hole-forming portion 25 and the non-hole-forming portion 26 may be separate members, and the pipe 2 may be constructed by inserting the small-diameter non-hole-forming portion 26 into the end of the large-diameter hole-forming portion 25.

[0037] The hollow fiber membrane bundle 3 is formed by bundling a plurality of hollow fiber membranes 31 extending along the extending direction D1. The hollow fiber membrane bundle 3 is arranged around the pipe 2 so as to cover the plurality of holes 24. The hollow fiber membrane bundle 3 is formed in a substantially cylindrical shape and extends along the extending direction D1. That is, a plurality of hollow fiber membranes 31 extending along the extending direction D1 are bundled together so that the hollow fiber membrane bundle 3 has a substantially cylindrical shape. One end of the hollow fiber membrane bundle 3 in the extending direction D1 is referred to as the first end 3a, and the other end of the hollow fiber membrane bundle 3 in the extending direction D1 is referred to as the second end 3b. The first end 3a is the end on the pipe inlet / outlet port 22 side in the extending direction D1. The second end 3b is the end on the opposite side of the pipe inlet / outlet port 22 in the extending direction D1.

[0038] Each of the hollow fiber membranes 31 is a hollow fiber membrane that allows gas G to pass through but not liquid L to pass through. The material, shape, and configuration of each of the hollow fiber membranes 31 are not particularly limited. Examples of materials for each of the hollow fiber membranes 31 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 configuration (sidewall shape) of each of the hollow fiber membranes 31 include porous membranes, microporous membranes, and homogeneous membranes (non-porous membranes) that do not have porosity. Examples of the configuration of each of the hollow fiber membranes 31 include symmetric membranes (homogeneous membranes) in which the entire membrane has a homogeneous chemical or physical structure, and asymmetric membranes (heterogeneous membranes) 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. In this case, the dense layer may be formed anywhere in the membrane, such as on the surface of the membrane or inside the porous membrane. Heterogeneous membranes also include composite membranes with different chemical structures and multilayer membranes such as three-layer structures. In particular, heterogeneous membranes using poly(4-methylpentene-1) resin are particularly preferred because they have a dense layer that blocks liquid L.

[0039] There are no particular limitations on the outer diameter of each of the hollow fiber membranes 31. From the viewpoint of increasing the membrane area, the outer diameter of each of the hollow fiber membranes 31 can be, for example, 500 μm or less, preferably 350 μm or less, and more preferably 250 μm or less. On the other hand, from the viewpoint of suppressing breakage, the outer diameter of each of the hollow fiber membranes 31 can be, for example, 50 μm or more, preferably 150 μm or more, and more preferably 200 μm or more.

[0040] The hollow fiber membrane bundle 3 is disposed on the outer periphery of the hole-formed portion 25 of the pipe 2, but is not disposed on the outer periphery of the non-hole-formed portion 26 of the pipe 2. The hollow fiber membrane bundle 3 is formed in a substantially cylindrical shape so as to surround the hole-formed portion 25. The hollow fiber membrane bundle 3 is formed, for example, from a hollow fiber membrane fabric 8 (see FIG. 6) woven in the shape of a blind. The hollow fiber membrane fabric 8 is a fabric woven from a plurality of hollow fiber membranes 31 that serve as weft yarns and warp yarns 9. In the hollow fiber membrane fabric 8, a plurality of hollow fiber membranes 31 are arranged in the shape of a blind. The hollow fiber membrane bundle 3 is formed by winding the hollow fiber membrane fabric 8 around the hole-formed portion 25 so that the plurality of hollow fiber membranes 31 extend in the extension direction D1.

[0041] In the hollow fiber membrane bundle 3, intermembrane spaces S1 are formed between the plurality of hollow fiber membranes 31 (between adjacent hollow fiber membranes 31). The intermembrane spaces S1 are spaces through which a liquid L can flow. The intermembrane spaces S1 are also formed between the plurality of hollow fiber membranes 31 in the circumferential direction D2 of the pipe 2, and also between the plurality of hollow fiber membranes 31 in the radial direction D3 of the pipe 2.

[0042] The housing 4 accommodates the pipe 2 and the hollow fiber membrane bundle 3 so that a space S2 is formed between the hollow fiber membrane bundle 3 and the housing 4. The space S2 is a space between the hollow fiber membrane bundle 3 and the housing 4 through which the liquid L can flow. The housing 4 is formed in a cylindrical shape extending in the extension direction D1. A first end 2a of the pipe 2, where a pipe supply / discharge port 22 is formed, protrudes from the housing 4, and the pipe supply / discharge port 22 is open to the outside of the housing 4. Note that the first end 2a of the pipe 2 does not necessarily have to protrude from the housing 4, but in this embodiment, the first end 2a of the pipe 2 protrudes from the housing 4 from the viewpoint of facilitating connection of other members to the pipe 2.

[0043] The partition 5 divides the area inside the housing 4 into an inner area R1 and an outer area R2. The inner area R1 is an area that includes the hollow portions 32 of the plurality of hollow fiber membranes 31. The outer area R2 is an area that includes the intermembrane spaces S1 between the plurality of hollow fiber membranes 31. Therefore, each of the plurality of hollow fiber membranes 31 serves as a boundary between the inner area R1 and the outer area R2. Each of the plurality of hollow fiber membranes 31 prevents the liquid L from passing from the outer area R2 to the inner area R1, and allows the gas G (such as dissolved gas in the liquid L or air bubbles contained in the liquid L) to pass from the outer area R2 to the inner area R1.

[0044] The partition 5 has a first sealing portion 51 and a second sealing portion 52. The first sealing portion 51 holds the first end portion 3a of the hollow fiber membrane bundle 3 and seals the space between the pipe 2, the housing 4, and the plurality of hollow fiber membranes 31. The first end portion 3a of the hollow fiber membrane bundle 3 is fixed to the outer circumferential surface of the pipe 2 and the inner circumferential surface of the housing 4 by the first sealing portion 51. The second sealing portion 52 holds the second end portion 3b of the hollow fiber membrane bundle 3 and seals the space between the pipe 2, the housing 4, and the plurality of hollow fiber membranes 31. The second end portion 3b of the hollow fiber membrane bundle 3 is fixed to the outer circumferential surface of the pipe 2 and the inner circumferential surface of the housing 4 by the second sealing portion 52. The first sealing portion 51 and the second sealing portion 52 are formed of, for example, a resin. Examples of resins used for the first sealing portion 51 and the second sealing portion 52 include epoxy resin, urethane resin, ultraviolet-curable resin, and polyolefin resin such as polyethylene or polypropylene.

[0045] In a cross section perpendicular to the extending direction D1, the first sealing portion 51 and the second sealing portion 52 fill the entire area between the pipe 2 and the housing 4 except for the plurality of hollow fiber membranes 31. That is, in a cross section perpendicular to the extending direction D1, the first sealing portion 51 and the second sealing portion 52 fill the area between the pipe 2 and the hollow fiber membrane bundle 3, between the plurality of hollow fiber membranes 31 (intermembrane spaces S1), and between the hollow fiber membrane bundle 3 and the housing 4 (spaces S2). The hollow portions 32 of the plurality of hollow fiber membranes 31 are open from the first sealing portion 51 to the side opposite the second sealing portion 52, and are also open from the second sealing portion 52 to the side opposite the first sealing portion 51.

[0046] The first sealing portion 51 is disposed between the hole-forming portion 25 and the non-hole-forming portion 26 in the extension direction D1. The second sealing portion 52 is disposed at the end of the hole-forming portion 25 opposite the non-hole-forming portion 26 in the extension direction D1. That is, the multiple holes 24 of the pipe 2 are formed between the first sealing portion 51 and the second sealing portion 52 in the extension direction D1. Therefore, the region between the pipe 2 and the housing 4 on the side of the first sealing portion 51 opposite the second sealing portion 52 is defined as an internal region R1. Furthermore, the region of the housing 4 on the side of the second sealing portion 52 opposite the first sealing portion 51 is defined as an internal region R1. The region of the internal region R1 on the side of the first sealing portion 51 opposite the second sealing portion 52 is referred to as a first internal region S3. Furthermore, the region of the internal region R1 on the side of the second sealing portion 52 opposite the first sealing portion 51 is referred to as a second internal region S4. On the other hand, the intermembrane spaces S1 between the plurality of hollow fiber membranes 31 between the first sealed portion 51 and the second sealed portion 52 and the space S2 between the housing 4 and the hollow fiber membrane bundle 3 form the outer region R2.

[0047] The housing 4 is formed with a first air intake port 41, a second air intake port 42, and a housing liquid supply / discharge port 43.

[0048] The first air intake port 41 and the second air intake port 42 are openings for drawing air from the internal region R1. The first air intake port 41 is formed on the side of the first sealing portion 51 opposite the second sealing portion 52 in the extension direction D1. The first air intake port 41 is connected to the internal region R1 located on the side of the first sealing portion 51 opposite the second sealing portion 52. The second air intake port 42 is formed on the side of the second sealing portion 52 opposite the first sealing portion 51 in the extension direction D1. The second air intake port 42 is connected to the internal region R1 located on the side of the second sealing portion 52 opposite the first sealing portion 51. A suction device (not shown), such as a vacuum pump, is connected to the first air intake port 41 and the second air intake port 42.

[0049] The housing liquid supply / drainage port 43 is an opening that opens the external region R2 to the outside of the housing 4. The housing liquid supply / drainage port 43 is formed between the first sealing portion 51 and the second sealing portion 52 in the extension direction D1. The housing liquid supply / drainage port 43 is connected to a space S2 that is located between the first sealing portion 51 and the second sealing portion 52 and that is the external region R2.

[0050] The position of the housing liquid supply and drainage port 43 in the extension direction D1 is not particularly limited, but in this embodiment, the housing liquid supply and drainage port 43 is located near the second sealing portion 52 in order to increase the distance between the pipe liquid supply and drainage port 22 and the housing liquid supply and drainage port 43 in the extension direction D1.

[0051] The housing 4 includes a cylindrical body 4a, a first lid portion 4b, and a second lid portion 4c.

[0052] The cylindrical body 4a is a portion in which the hollow fiber membrane bundle 3 is housed. The cylindrical body 4a is formed in a cylindrical shape extending in the extension direction D1 and open at both ends. The first sealing portion 51 is disposed at one open end of the cylindrical body 4a in the extension direction D1, and the second sealing portion 52 is disposed at the other open end of the cylindrical body 4a in the extension direction D1. That is, the first end 3a of the hollow fiber membrane bundle 3 is fixed to one open end of the cylindrical body 4a by the first sealing portion 51, and the second end 3b of the hollow fiber membrane bundle 3 is fixed to the other open end of the cylindrical body 4a by the second sealing portion 52. The external region R2 is formed within the cylindrical body 4a, and the housing liquid supply / discharge port 43 is formed in the side wall of the cylindrical body 4a and communicates with the external region R2.

[0053] The first cover portion 4b is a portion that forms the first internal region S3 (internal region R1). The first cover portion 4b is formed in a cylindrical shape that extends in the extension direction D1 and has one open end and the other closed end. The first cover portion 4b covers the side of the first sealing portion 51 opposite to the second sealing portion 52 and is attached to the open end on one side of the cylindrical body 4a so as to surround the first sealing portion 51 from the outside of the cylindrical body 4a. Therefore, by attaching the first cover portion 4b to the cylindrical body 4a, the first internal region S3 is formed inside the first cover portion 4b. The first air intake port 41 is formed in the side wall of the first cover portion 4b and is in communication with the first internal region S3 (internal region R1). The pipe 2 penetrates the first cover portion 4b, and the first cover portion 4b is attached to the outer peripheral surface of the pipe 2 so as to maintain an airtight seal between the first cover portion 4b and the pipe 2.

[0054] The second lid portion 4c is a portion that forms the second internal region S4 (internal region R1). The second lid portion 4c is formed in a cylindrical shape that extends in the extension direction D1 and has one open end and the other closed end. The second lid portion 4c covers the side of the second sealing portion 52 opposite to the first sealing portion 51 and is attached to the open end on the other side of the cylindrical body 4a so as to surround the second sealing portion 52 from the outside of the cylindrical body 4a. Therefore, by attaching the second lid portion 4c to the cylindrical body 4a, the second internal region S4 is formed inside the second lid portion 4c. The second air intake port 42 is formed in the side wall of the second lid portion 4c and is in communication with the second internal region S4 (internal region R1). A pipe sealing portion 23 abuts against the inner surface of the second lid portion 4c.

[0055] The baffle 6 is intended to inhibit the flow of the liquid L in the intermembrane space S1 in the extension direction D1. Here, because the multiple hollow fiber membranes 31 extend along the extension direction D1, in the intermembrane space S1, the fluid resistance in the extension direction D1 is likely to be smaller than the fluid resistance in the radial direction D3. For this reason, in the intermembrane space S1, a drift occurs in which the liquid L flows in the extension direction D1 rather than the radial direction D3. When such a drift occurs in the intermembrane space S1, the flow rate of the liquid L in the housing 4 is likely to vary. Therefore, the baffle 6 inhibits the flow of the liquid L in the extension direction D1 in the intermembrane space S1, thereby reducing the drift of the liquid L in the extension direction D1 in the intermembrane space S1. Note that the baffle 6 does not need to inhibit all of the flow of the liquid L in the intermembrane space S1 in the extension direction D1; it is sufficient if it can inhibit at least a portion of the flow of the liquid L in the intermembrane space S1 in the extension direction D1.

[0056] The baffle 6 is disposed between the first sealed portion 51 and the second sealed portion 52 in the extension direction D1. The baffle 6 is disposed in the intermembrane space S1 and extends in a direction intersecting the extension direction D1. In this embodiment, the baffle 6 is provided in the entire area from the pipe 2 to the end of the intermembrane space S1 opposite to the pipe 2, excluding the plurality of hollow fiber membranes 31, in a cross section perpendicular to the extension direction D1. More specifically, the baffle 6 extends in the circumferential direction D2 and radial direction D3 of the pipe 2. That is, the baffle 6 extends in a direction perpendicular to the extension direction D1. The baffle 6 also extends across the entire intermembrane space S1 in the circumferential direction D2 of the pipe 2. The baffle 6 also extends across the entire intermembrane space S1 in the radial direction D3 of the pipe 2. The baffle 6 also extends from the pipe 2 to the end of the intermembrane space S1 opposite to the pipe 2. The end of the intermembrane space S1 opposite the pipe 2 refers to, for example, the end of the intermembrane space S1 opposite the pipe 2 in the radial direction D3. Note that a space S2 is formed between the baffle 6 and the housing 4, but the baffle 6 may protrude beyond the intermembrane space S1 into the space S2 as long as the space S2 is not closed by the baffle 6.

[0057] The thickness of the baffle 6 in the extension direction D1 is not particularly limited. From the viewpoint of increasing the contact area between the liquid L and the plurality of hollow fiber membranes 31, it is preferable that the thickness of the baffle 6 in the extension direction D1 be as thin as possible within the range in which the rigidity of the baffle 6 can be maintained.

[0058] The position of the baffle 6 in the extension direction D1 is not particularly limited. For example, the baffle 6 can be disposed in the area on the housing liquid supply / drainage port 43 side when the area between the first sealing portion 51 and the housing liquid supply / drainage port 43 in the extension direction D1 is divided into two, three, or four equal parts. In this embodiment, the baffle 6 is disposed near the housing liquid supply / drainage port 43 on the pipe liquid supply / drainage port 22 side of the housing liquid supply / drainage port 43 in the extension direction D1.

[0059] The baffle 6 is formed of, for example, a resin. Examples of the resin used for the baffle 6 include urethane-based resins such as polyurethane (PU) and thermoplastic polyurethane (TPU); polycarbonate (PC); vinyl chloride-based resins such as polyvinyl chloride (PVC) and vinyl chloride-vinyl acetate copolymer resin; acrylic resins such as polyacrylic acid, polymethacrylic acid, polymethyl acrylate, polymethyl methacrylate (PMMA), and polyethyl methacrylate; polyester-based resins such as polyethylene terephthalate (PET), polybutylene terephthalate, polytrimethylene terephthalate, polyethylene naphthalate, and polybutylene naphthalate; polyamide-based resins such as nylon (registered trademark); polystyrene (PS), imide-modified polystyrene, acrylonitrile-butadiene-styrene (ABS) resin, and imide-modified ABS resin. Examples of suitable thermosetting resins include polystyrene-based resins such as styrene-acrylonitrile copolymer (SAN) resin and acrylonitrile-ethylene-propylene-diene-styrene (AES) resin; olefin-based resins such as polyethylene (PE) resin, polypropylene (PP) resin, polymethylpentene (PMP) resin, and cycloolefin resin; cellulose-based resins such as nitrocellulose and cellulose acetate; silicone-based resins; fluorine-based resins; and thermoplastic resins such as polyphenylene ether (PPE) resin; epoxy-based resins such as bisphenol A epoxy resin, bisphenol F epoxy resin, isocyanurate epoxy resin, and hydantoin epoxy resin; amino-based resins such as melamine resin and urea resin; phenolic resins; and unsaturated polyester-based resins. Of these, PP, PE, PVC, epoxy, PMP, and PU are preferred.

[0060] FIG. 6 is a schematic cross-sectional view illustrating an example of a method for forming a baffle. As shown in FIG. 6, when forming the baffle 6, first, a hollow fiber membrane fabric 8 is wound around the pipe 2 so as to cover the multiple holes 24 in the pipe 2. As described above, the hollow fiber membrane fabric 8 is a fabric in which multiple hollow fiber membranes 31, which serve as wefts, are woven with warp yarns 9. In this case, if the surface of the hollow fiber membrane fabric 8 that is wound around the pipe 2 is the fabric inner surface 8a, a molten resin 10 is applied to the fabric inner surface 8a at a position corresponding to the baffle 6. Then, the hollow fiber membrane fabric 8 to which the molten resin 10 has been applied is wound around the pipe 2. The molten resin 10 then impregnates the inner layer hollow fiber membrane fabric 8 and the outer layer hollow fiber membrane fabric 8, filling the positions corresponding to the baffle 6. The molten resin 10 then hardens to form the baffle 6.

[0061] Next, a method for degassing the liquid L using the degassing module 1 will be described.

[0062] The internal region R1 is suctioned through the first suction port 41 and the second suction port 42, and the liquid L is supplied to the external region R2 through the liquid supply / discharge pipe port 22. Suction of the internal region R1 through the first suction port 41 and the second suction port 42 can be performed, for example, by connecting a suction device (not shown) such as a vacuum pump to the first suction port 41 and the second suction port 42 and operating this suction device. Then, by suctioning the internal region R1 through the first suction port 41 and the second suction port 42, the internal region R1 including the hollow portions 32 of each of the plurality of hollow fiber membranes 31 is depressurized.

[0063] As a result, the liquid L is supplied from the pipe inlet / outlet port 22 to the pipe flow path 21, exits the pipe 2 through the multiple holes 24, and is supplied to the intermembrane space S1. At this time, the hollow portion 32 of each of the multiple hollow fiber membranes 31 is in a depressurized state, so that gas G, such as dissolved gas in the liquid L and bubbles contained in the liquid L, passes through each of the multiple hollow fiber membranes 31. This degasses the liquid L. Here, the liquid L exiting from the multiple holes 24 flows through the intermembrane space S1 not only in the radial direction D3 but also in the extension direction D1 through the intermembrane space S1. The flow of the liquid L flowing through the intermembrane space S1 in the extension direction D1 is obstructed by the baffle 6, and so it reaches the space S2 on the side of the baffle 6 on the pipe inlet / outlet port 22 in the extension direction D1. The liquid L degassed in the intermembrane space S1 passes through the space S2 and is discharged to the outside of the degassing module 1 through the housing liquid supply / discharge port 43.

[0064] As described above, in the degassing module 1 according to this embodiment, when liquid L is supplied to the pipe 2 through the pipe inlet / outlet port 22, the liquid L exits the pipe 2 through the multiple holes 24, passes through the intermembrane space S1 between the multiple hollow fiber membranes 31, and is discharged from the housing inlet / outlet port 43. At this time, the liquid L can be degassed by suctioning air into the internal region R1 through the first inlet 41 and the second inlet 42. Because the multiple hollow fiber membranes 31 extend along the extension direction D1, a biased flow of the liquid L in the intermembrane space S1 occurs. However, because the baffle 6 extending in a direction intersecting the extension direction D1 is disposed in the intermembrane space S1, the flow of the liquid L in the extension direction D1 in the intermembrane space S1 is obstructed by the baffle 6. Furthermore, the baffle 6 can mitigate the effect of the tensile force of the liquid L being discharged from the housing inlet / outlet port 43. This reduces uneven flow of the liquid L in the extending direction D1 in the intermembrane space S1, thereby reducing variations in the flow rate of the liquid L within the housing 4. As a result, the degassing performance can be improved.

[0065] Furthermore, in this degassing module 1, the baffles 6 extend in the circumferential direction D2, and therefore the flow of the liquid L in the intermembrane spaces S1 in the extension direction D1 can be effectively inhibited.

[0066] Furthermore, in this degassing module 1, the baffle 6 extends over the entire intermembrane space S1 in the circumferential direction D2, so that the flow of the liquid L in the intermembrane space S1 in the extension direction D1 can be inhibited over the entire circumferential direction D2.

[0067] Furthermore, in this degassing module 1, the baffles 6 extend in the radial direction D3, and therefore the flow of the liquid L in the intermembrane space S1 in the extending direction D1 can be effectively inhibited.

[0068] In addition, in this degassing module 1, the baffle 6 extends across the entire intermembrane space S1 in the radial direction D3, so that the flow of the liquid L in the intermembrane space S1 in the extension direction D1 can be obstructed across the entire radial direction D3.

[0069] In addition, in this degassing module 1, the baffle 6 extends from the pipe 2 to the end of the intermembrane space S1 opposite the pipe 2 in the radial direction D3, thereby more effectively inhibiting the flow of the liquid L in the intermembrane space S1 in the extension direction D1.

[0070] In this degassing module 1, the plurality of hollow fiber membranes 31 are arranged to extend along the extension direction D1 by the first sealing portion 51 and the second sealing portion 52. The first sealing portion 51 and the second sealing portion 52 each seal the space between the pipe 2, the housing 4, and the plurality of hollow fiber membranes 31, and therefore the first sealing portion 51 and the second sealing portion 52 can partition the area within the housing 4 into an inner area R1 and an outer area R2.

[0071] Furthermore, in this degassing module 1, the housing liquid supply / discharge port 43 is located near the second sealed portion 52, so the liquid L can be brought into contact with the plurality of hollow fiber membranes 31 over a long range in the extension direction D1. The baffle 6 is disposed on the pipe liquid supply / discharge port 22 side of the housing liquid supply / discharge port 43 in the extension direction D1. Therefore, the flow of the liquid L in the intermembrane space S1 in the extension direction D1 can be obstructed between the pipe liquid supply / discharge port 22 and the housing liquid supply / discharge port 43 in the extension direction D1.

[0072] Furthermore, in this degassing module 1, the baffle 6 is disposed in the region on the housing liquid supply / drainage port 43 side when the region between the first sealing portion 51 and the housing liquid supply / drainage port 43 in the extension direction D1 is divided into two equal parts, and therefore the influence of the pulling force of the liquid L discharged from the housing liquid supply / drainage port 43 can be alleviated at a position close to the housing liquid supply / drainage port 43. This makes it possible to effectively suppress drift of the liquid L caused by the pulling force of the liquid L discharged from the housing liquid supply / drainage port 43.

[0073] Furthermore, in this degassing module 1, the baffle 6 is disposed near the housing liquid supply / drainage port 43 in the extension direction D1, and therefore the influence of the tensile force of the liquid L discharged from the housing liquid supply / drainage port 43 can be alleviated near the housing liquid supply / drainage port 43. This makes it possible to more effectively suppress the drift of the liquid L caused by the influence of the tensile force of the liquid L discharged from the housing liquid supply / drainage port 43.

[0074] In the liquid degassing method according to this embodiment, the liquid L is degassed using the degassing module 1 described above, so that the variation in the flow rate of the liquid L within the housing 4 can be reduced, and the degassing performance can be improved.

[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 baffles were described as extending over the entire intermembrane space in the radial direction of the pipe, but the baffles may be provided in only a portion of the intermembrane space in the radial direction of the pipe, as in the degassing module 1A shown in Fig. 7. When baffles are provided in a portion of the intermembrane space in the radial direction of the pipe, by providing the baffles in the radial portion where the liquid flows easily in the extension direction and not providing the baffles in the radial portion where the liquid flows less easily in the extension direction, it is possible to reduce the material costs of the baffles while effectively obstructing the flow of liquid in the intermembrane space in the extension direction.

[0077] Fig. 7 is a schematic cross-sectional view of a degassing module of a modified example. The degassing module 1A shown in Fig. 7 is basically the same as the degassing module 1 of the above embodiment, but a baffle 6A corresponding to the baffle 6 of the degassing module 1 extends from a position spaced apart from the pipe 2 to the end of the intermembrane space S1 opposite the pipe 2. In other words, the pipe 2 and the baffle 6A are spaced apart, allowing the liquid L to flow between the pipe 2 and the baffle 6A. Note that the baffle 6A may be divided into multiple pieces in the radial direction D3, and may not extend to the end of the intermembrane space S1 opposite the pipe 2 in the radial direction D3.

[0078] In the intermembrane space S1, the liquid L tends to flow more easily in the extension direction D1 the further away from the pipe 2. In this degassing module 1A, the baffle 6A extends from a position away from the pipe 2 to the end of the intermembrane space S1 opposite the pipe 2, thereby effectively obstructing the flow of the liquid L in the intermembrane space S1 in the extension direction D1 while reducing the material cost of the baffle 6A.

[0079] Furthermore, for example, in the above embodiment, the baffles have been described as extending over the entire circumferential area of ​​the pipe, but the baffles may be provided only on a portion of the circumferential area of ​​the pipe, as in the degassing module 1B shown in Fig. 8. When the baffles are provided in a portion of the intermembrane space in the circumferential direction, the baffles are provided in the circumferential portion where the liquid flows easily in the extension direction, and no baffles are provided in the circumferential portion where the liquid flows less easily in the extension direction, thereby effectively obstructing the flow of liquid in the intermembrane space in the extension direction while reducing the material cost of the baffles.

[0080] FIG. 8 is a schematic cross-sectional view of a degassing module of a modified example. The degassing module 1B shown in FIG. 8 is basically the same as the degassing module 1 of the above embodiment, except that a baffle 6B corresponding to the baffle 6 of the degassing module 1 is provided on the housing inlet / outlet port 43 side of the pipe 2 when viewed from the direction along the central axis A (extension direction D1) (see FIG. 2), but is not provided on the opposite side of the housing inlet / outlet port 43 of the pipe 2. For example, when the intermembrane space S1 is divided by a line perpendicular to the line passing through the central axis A and the housing inlet / outlet port 43 when viewed from the direction along the central axis A (extension direction D1) (see FIG. 2), the baffle 6B is provided in the region on the housing inlet / outlet port 43 side, but not in the region opposite the housing inlet / outlet port 43. The baffle 6B may be divided into multiple parts in the circumferential direction D2.

[0081] In the intermembrane space S1, the liquid L tends to flow easily in the extension direction D1 on the side of the housing liquid supply / discharge port 43 of the pipe 2 as viewed from the extension direction D1. In this degassing module 1B, the baffle 6B is provided on the side of the housing liquid supply / discharge port 43 of the pipe 2 as viewed from the extension direction D1, and is not provided on the side opposite the housing liquid supply / discharge port 43 of the pipe 2 as viewed from the extension direction D1, so that the material cost of the baffle 6B can be reduced while effectively obstructing the flow of the liquid L in the intermembrane space S1 in the extension direction D1.

[0082] Furthermore, for example, in the above embodiment, the baffles were described as extending in a direction perpendicular to the extension direction of the pipe, but as in the degassing module 1C shown in Figure 9, the baffles may extend in a direction inclined relative to the radial direction of the pipe.

[0083] Fig. 9 is a schematic cross-sectional view of a degassing module of a modified example. The degassing module 1C shown in Fig. 9 is basically the same as the degassing module 1 of the above embodiment, but a baffle 6C corresponding to the baffle 6 of the degassing module 1 extends in a direction inclined with respect to the radial direction D3 and extends in a direction away from the housing liquid supply / discharge port 43 in the extension direction D1 as it moves away from the pipe 2. In other words, the baffle 6C is arranged so as to prevent the liquid L in the intermembrane space S1 from flowing toward the housing liquid supply / discharge port 43.

[0084] In this degassing module 1C, the baffles 6C extend in a direction inclined relative to the radial direction D3, so that the flow of the liquid L obstructed by the baffles 6C can be directed in the direction of the inclination of the baffles 6C. This makes it possible to control the flow of the liquid L within the housing 4.

[0085] Furthermore, in this degassing module 1C, the baffle 6C extends in the extension direction D1 away from the housing liquid supply / discharge port 43 as it moves away from the pipe 2, so that the liquid L flowing in the extension direction D1 in the intermembrane space S1 can be directed once away from the housing liquid supply / discharge port 43 and then toward the housing liquid supply / discharge port 43. This makes it possible to increase the contact distance between the liquid L and the plurality of hollow fiber membranes 31.

[0086] Furthermore, for example, in the above embodiment, the degassing module was described as having one baffle, but the degassing module may also have multiple baffles, such as the degassing module 1D shown in Figure 10 and the degassing module 1E shown in Figure 11.

[0087] FIG. 10 is a schematic cross-sectional view of a degassing module of a modified example. The degassing module 1D shown in FIG. 10 is basically the same as the degassing module 1 of the above embodiment, but includes a second baffle 7 in addition to the baffle 6. Like the baffle 6, the second baffle 7 is disposed in the intermembrane space S1 and extends in a direction intersecting the extension direction D1. The configuration, shape, etc. of the second baffle 7 may be the same as or different from that of the baffle 6. The second baffle 7 is disposed at a different position from the baffle 6 in the extension direction D1. Specifically, the second baffle 7 is disposed on the side of the pipe supply / discharge port 22 of the baffle 6 in the extension direction D1, that is, on the opposite side of the housing supply / discharge port 43 of the baffle 6 in the extension direction D1.

[0088] In this degassing module 1D, the second baffle 7, which is disposed in the intermembrane space S1 and extends in a direction intersecting the extension direction D1, is disposed at a different position in the extension direction D1 from the baffle 6, so that the flow of the liquid L in the intermembrane space S1 in the extension direction is also obstructed by the second baffle 7. This makes it possible to further reduce the variation in the flow rate of the liquid L within the housing 4.

[0089] Furthermore, in this degassing module 1D, the second baffle 7 is positioned on the pipe supply / discharge port 22 side of the baffle 6 in the extension direction D1, so that the flow of the liquid L in the intermembrane space S1 in the extension direction D1 can be obstructed further upstream.

[0090] FIG. 11 is a schematic cross-sectional view of a degassing module of a modified example. The degassing module 1E shown in FIG. 11 is basically the same as the degassing module 1 of the above embodiment, but includes a second baffle 7 in addition to the baffle 6. The housing liquid supply / drain port 43 is formed in the center between the first sealing portion 51 and the second sealing portion 52 in the extension direction D1. As with the degassing module 1 of the above embodiment, the baffle 6 is disposed near the housing liquid supply / drain port 43 on the pipe liquid supply / drain port 22 side of the housing liquid supply / drain port 43 in the extension direction D1. Like the baffle 6, the second baffle 7 is disposed in the intermembrane space S1 and extends in a direction intersecting the extension direction D1. The configuration, shape, etc. of the second baffle 7 may be the same as or different from the baffle 6. The second baffle 7 is disposed at a different position from the baffle 6 in the extension direction D1. Specifically, the second baffle 7 is disposed near the housing liquid supply / drainage port 43 on the opposite side of the housing liquid supply / drainage port 43 from the pipe liquid supply / drainage port 22 in the extension direction D1.

[0091] Thus, in this degassing module 1E, the second baffle 7, which is disposed in the intermembrane space S1 and extends in a direction intersecting the extension direction D1, is disposed at a different position in the extension direction D1 from the baffle 6. Therefore, the flow of the liquid L in the intermembrane space S1 in the extension direction is also obstructed by the second baffle 7. This makes it possible to further reduce the variation in the flow rate of the liquid L within the housing 4.

[0092] Furthermore, in this degassing module 1E, the baffle 6 is disposed on the pipe supply and drainage port 22 side of the housing liquid supply and drainage port 43 in the extension direction D1, and the second baffle 7 is disposed on the opposite side of the housing liquid supply and drainage port 43 from the pipe supply and drainage port 22 in the extension direction D1. In other words, the baffle 6 and the second baffle 7 are disposed on either side of the housing liquid supply and drainage port 43 in the extension direction D1. This makes it possible to inhibit the flow of liquid L from the pipe supply and drainage port 22 side toward the housing liquid supply and drainage port 43 in the extension direction D1, and also to inhibit the flow of liquid L from the opposite side of the pipe supply and drainage port 22 toward the housing liquid supply and drainage port 43 in the extension direction D1. Moreover, in this degassing module 1E, the housing liquid supply and drainage port 43 is formed in the center between the first sealing portion 51 and the second sealing portion 52, which provides a high effect.

[0093] Furthermore, in the above embodiment, the housing is described as having two intake ports formed therein, but the housing may have only one intake port formed therein.

[0094] Furthermore, for example, in the above embodiment, the method of degassing the liquid is described as supplying the liquid to the external area from the pipe liquid supply / drain port, but the liquid may also be supplied to the external area from the housing liquid supply / drain port.

[0095] FIG. 12 is a schematic cross-sectional view of a modified degassing module. The degassing module shown in FIG. 12 is identical to the degassing module shown in FIG. 1, except for the liquid flow. As shown in FIG. 12, in this method, the internal region R1 is suctioned through the first and second inlets 41 and 42, and the liquid L is supplied to the external region R2 through the housing inlet / outlet 43. The liquid L is then supplied from the housing inlet / outlet 43 through the space S2 to the intermembrane space S1. At this time, the hollow portions 32 of the hollow fiber membranes 31 are depressurized, so that gas G, such as dissolved gas in the liquid L and bubbles contained in the liquid L, passes through each of the hollow fiber membranes 31. This degasses the liquid L. The liquid L supplied from the housing inlet / outlet 43 through the space S2 to the intermembrane space S1 flows not only in the direction opposite to the radial direction D3 but also in the extension direction D1 through the intermembrane space S1. The liquid L flowing through the intermembrane space S1 in the extension direction D1 is obstructed by the baffle 6, and reaches the pipe 2 on the housing liquid supply / discharge port 43 side of the baffle 6 in the extension direction D1. The liquid L degassed in the intermembrane space S1 is then supplied to the pipe flow path 21 through the multiple holes 24 in the pipe 2 and discharged to the outside of the degassing module 1 through the pipe liquid supply / discharge port 22. In this case, too, the position, shape, number, etc. of the baffles are not particularly limited and can be, for example, similar to the above-mentioned modified example. [Example]

[0096] Next, examples of the present disclosure will be described, but the present disclosure is not limited to the following examples.

[0097] (Examples 1 and 2 and Comparative Example 1) The degassing module 1 shown in FIG. 1 was used as the simulation model for Example 1. The degassing module 1D shown in FIG. 10 was used as the simulation model for Example 2. The degassing module 101 shown in FIG. 13 was used as the simulation model for Comparative Example 1. The degassing module 101 shown in FIG. 13 is basically the same as the degassing module 1 shown in FIG. 1, and differs from the degassing module 1 shown in FIG. 1 only in that it does not have a baffle 6. The simulation model for Example 1 is a model equipped with one baffle, the simulation model for Example 2 is a model equipped with two baffles, and the simulation model for Comparative Example 1 is a model equipped with no baffle.

[0098] The flow rate of the liquid flowing through space S2 was calculated by simulation for the simulation models of Examples 1 and 2 and Comparative Example 1. ANSYS FLUENT analysis software was used. Simulation conditions included water at 25°C as the liquid model, and a constant resistance value was set as the resistance to the passage of the liquid through the hollow fiber membrane bundle. Six points were used to calculate the flow rate of the liquid in space S2 on the opposite side of pipe 2 from the housing liquid inlet / outlet port 43 and in space S2 on the housing liquid inlet / outlet port 43 side of pipe 2. The calculation points for the flow rate of the liquid in space S2 on the opposite side of pipe 2 from the housing liquid inlet / outlet port 43 were numbered 1 to 6 in order of proximity to the pipe liquid inlet / outlet port 22. The calculation points for the flow rate of the liquid in space S2 on the housing liquid inlet / outlet port 43 side of pipe 2 were numbered 7 to 12 in order of proximity to the pipe liquid inlet / outlet port 22. The calculation results are shown in FIG. 14 .

[0099] As shown in FIG. 14, in the space S2 on the opposite side of the pipe 2 from the housing liquid supply / discharge port 43, in all of Examples 1 and 2 and Comparative Example 1, there was almost no variation in the flow rate over the entire area in the extension direction D1.

[0100] In the space S2 on the housing liquid supply / drain port 43 side of the pipe 2, in Comparative Example 1, the liquid flow rate was small at positions far from the housing liquid supply / drain port 43 and was large at positions close to the housing liquid supply / drain port 43. In contrast, in both Examples 1 and 2, there was no large variation in the flow rate over the entire area in the extension direction D1, and the variation in the flow rate was significantly smaller than in Comparative Example 1. Furthermore, Example 2 had smaller variation in the flow rate than Example 1.

[0101] These results show that the provision of baffles can reduce the variation in the liquid flow rate within the housing. In addition, the results show that increasing the number of baffles can further reduce the variation in the liquid flow rate within the housing. [Explanation of symbols]

[0102] 1... degassing module, 1A... degassing module, 1B... degassing module, 1C... degassing module, 1D... degassing module, 1E... degassing module, 2... pipe, 2a... first end, 2b... second end, 3... hollow fiber membrane bundle, 3a... first end, 3b... second end, 4... housing, 4a... cylinder, 4b... first lid portion, 4c... second lid portion, 5... partition portion, 6... baffle, 6A... baffle, 6B... baffle, 6C... baffle, 7... second baffle, 8... hollow fiber membrane fabric, 8a... inner surface of fabric, 9... warp yarn, 10... molten resin, 21...pipe internal flow path, 22...pipe inlet / outlet port, 23...pipe sealed portion, 24...hole, 25...hole-formed portion, 26...non-hole-formed portion, 31...hollow fiber membrane, 32...hollow portion, 41...first air inlet, 42...second air inlet, 43...housing inlet / outlet port, 51...first sealed portion, 52...second sealed portion, 101...degassing module, A...central axis, D1...extension direction, D2...circumferential direction, D3...radial direction, G...gas, L...liquid, R1...internal region, R2...external region, S1...intermembrane space, S2...space, S3...first internal region, S4...second internal region.

Claims

1. a pipe having a plurality of holes formed therein; a hollow fiber membrane bundle in which a plurality of hollow fiber membranes extending along the extension direction of the pipe are bundled together and arranged around the pipe so as to cover the plurality of holes; a housing that accommodates the pipe and the hollow fiber membrane bundle so that a space is formed between the pipe and the hollow fiber membrane bundle; a partition that divides the area within the housing into an internal area including hollow portions of the plurality of hollow fiber membranes and an external area including inter-membrane spaces between the plurality of hollow fiber membranes; a baffle disposed in the inter-membrane space and extending in a direction intersecting the extension direction; the pipe has a pipe supply / discharge port formed at one end thereof and open to the outside of the housing, and a pipe sealing portion that seals the pipe at the other end thereof; The housing has an air intake port communicating with the internal region and a housing liquid supply / discharge port communicating with the external region. Degassing module.

2. The baffle extends in the circumferential direction of the pipe. The degassing module of claim 1 .

3. The baffle extends across the entire inter-membrane space in the circumferential direction. The degassing module according to claim 2 .

4. The baffle is provided in a part of the inter-membrane space in the circumferential direction. The degassing module according to claim 2 .

5. the baffle is provided on the housing liquid supply / discharge port side of the pipe as viewed from the extension direction, and is not provided on the opposite side of the pipe from the housing liquid supply / discharge port as viewed from the extension direction. The degassing module of claim 1 .

6. The baffle extends radially of the pipe. The degassing module of claim 1 .

7. The baffle extends across the entire inter-membrane space in the radial direction. The degassing module according to claim 6.

8. The baffle is provided in a part of the inter-membrane space in the radial direction. The degassing module according to claim 6.

9. the baffle extends from the pipe to an end of the inter-membrane space opposite the pipe in the radial direction of the pipe; The degassing module of claim 1 .

10. the baffle extends from a position spaced apart from the pipe to an end of the inter-membrane space opposite the pipe in the radial direction of the pipe; The degassing module of claim 1 .

11. The baffle extends in a direction inclined relative to the radial direction of the pipe. The degassing module of claim 1 .

12. The partition portion is a first sealing portion that holds one end of the hollow fiber membrane bundle and seals spaces among the pipe, the housing, and the plurality of hollow fiber membranes; a second sealing portion that is disposed on the opposite side of the pipe liquid supply / discharge port of the first sealing portion in the extending direction, and that holds the other end of the hollow fiber membrane bundle to seal spaces between the pipe, the housing, and the plurality of hollow fiber membranes, The plurality of holes of the pipe are formed between the first sealing portion and the second sealing portion in the extension direction. The degassing module of claim 1 .

13. the housing liquid supply / discharge port is located near the second sealing portion, The baffle is disposed on the pipe liquid supply / discharge port side of the housing liquid supply / discharge port in the extension direction. The degassing module of claim 12.

14. the baffle is disposed in a region on the housing liquid supply / discharge port side when a region between the first sealing portion and the housing liquid supply / discharge port in the extension direction is divided into two equal parts. The degassing module of claim 13.

15. The baffle is disposed near the housing inlet / outlet port. The degassing module of claim 13.

16. The baffle extends in the extension direction in a direction away from the housing liquid supply / discharge port as it moves away from the pipe. The degassing module of claim 13.

17. a second baffle disposed in the intermembrane space and extending in a direction intersecting the extension direction, the second baffle being disposed at a position different from the baffle in the extension direction; The degassing module of claim 1 .

18. The second baffle is disposed on the pipe supply / discharge port side of the baffle in the extension direction.

18. The degassing module of claim 17.

19. the baffle is disposed on the pipe liquid supply / drain port side of the housing liquid supply / drain port in the extension direction, The second baffle is disposed on the opposite side of the housing liquid supply / discharge port from the pipe liquid supply / discharge port in the extension direction.

18. The degassing module of claim 17.

20. The pipe is not provided with any member sealing the pipe other than the pipe sealing portion. The degassing module of claim 1 .

21. 21. The degassing module according to claim 1, wherein air is drawn into the internal region through the air inlet, and liquid is supplied to the external region through the pipe liquid supply / discharge port or the housing liquid supply / discharge port. How to degas a liquid.

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