Degassing module and method for degassing a liquid

Abstract

This degassing module comprises: a pipe which forms an intra-pipe flow channel having a liquid feed port and a liquid discharge port and which has a plurality of holes formed therein in order to provide opening to the intra-pipe flow channel; a hollow fiber membrane group obtained by winding, on the outer circumferential side of the pipe, a hollow-fiber fabric including warp and weft in the form of a plurality of hollow fiber membranes, so as to cover the respective holes; a housing which is connected to the outer circumferential surface of the pipe and which accommodates the hollow-fiber membrane group therein; a partition part which partitions the internal area of the housing into an inner area that includes the inner circumferential-side space of the respective hollow fiber membranes and an outer area that includes intermembrane space between the respective hollow fiber membranes; an intake port of the housing connected to the inner area; and a baffle which partitions the intra-pipe flow channel and the intermembrane space in the extending direction of the pipe. The proportion of the diameter of the warp with respect to each of the diameters of the hollow fiber membranes is 60% or more.

Description

Technical Field

[0001] One aspect of the present invention relates to a degassing module for degassing a liquid and a method for degassing a liquid.

Background Art

[0002] Conventionally, a degassing module that uses a plurality of hollow fiber membranes to degas a liquid is known. As such a degassing module, for example, there is a contactor described in Patent Document 1. The contactor described in Patent Document 1 includes a perforated pipe, a plurality of hollow fiber membranes surrounding the pipe, a baffle for changing the direction of the liquid flow, a tube sheet for fixing the ends of the plurality of hollow fiber membranes to the pipe, a shell for accommodating the plurality of hollow fiber membranes, and an air inlet formed in the shell. In this contactor, when liquid is supplied to the pipe, the liquid exits the pipe on the upstream side of the baffle, passes through the intermembrane space between the plurality of hollow fiber membranes, passes between the baffle and the shell, then passes through the intermembrane space between the plurality of hollow fiber membranes, and enters the pipe again on the downstream side of the baffle. At this time, the inner cavity of the hollow fiber membrane is vacuum-sucked from the air inlet, so that the entrained gas of the liquid moves to the inner cavity side of the hollow fiber membrane, and the liquid is degassed. Then, the degassed liquid is discharged from the pipe.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By providing a baffle in the degassing module as in the contactor described in Patent Document 1, the degassing performance of the degassing module can be improved. In particular, in a large-sized degassing module, the effect is significant.

[0005] However, in the contactor described in Patent Document 1, a plurality of hollow fiber membranes on the downstream side of the baffle are pressed against the pipe side by the flow of the liquid that re-enters the pipe beyond the baffle. As a result, the outer peripheral hollow fiber membranes penetrate between the inner peripheral hollow fiber membranes, etc., narrowing the intermembrane space between the plurality of hollow fiber membranes that form the liquid flow path, and increasing the pressure loss of the liquid.

[0006] Therefore, one aspect of the present invention is to provide a degassing module capable of reducing the pressure loss of a liquid and a method for degassing a liquid.

Means for Solving the Problems

[0007] The degassing module according to one aspect of the present invention includes a pipe forming an internal flow path of a pipe having a liquid supply port and a liquid discharge port and having a plurality of holes for opening the internal flow path of the pipe, and a hollow fiber membrane fabric having a plurality of hollow fiber membranes as weft threads and warp threads, which is wound around the outer peripheral side of the pipe so as to cover the plurality of holes, a housing connected to the outer peripheral surface of the pipe and accommodating the hollow fiber membrane group, a partition portion partitioning the region inside the housing into an internal region including the inner peripheral side space of each of the plurality of hollow fiber membranes and an external region including the intermembrane space between the plurality of hollow fiber membranes, an air intake port of the housing communicating with the internal region, and a baffle partitioning the internal flow path of the pipe and the intermembrane space in the extending direction of the pipe. The ratio of the diameter of each of the plurality of hollow fiber membranes to the diameter of the warp thread is 0.6 or more.

[0008] In this degassing module, the liquid can be degassed by sucking air into the internal region from the air intake port and supplying the liquid to the internal flow path of the pipe from the liquid supply port. And the internal flow path of the pipe and the intermembrane space are partitioned in the extending direction by the baffle. For this reason, when the liquid is supplied from the liquid supply port to the internal flow path of the pipe, the liquid exits the pipe on the liquid supply port side of the baffle, passes through the intermembrane space, passes through the baffle clearance between the baffle and the housing, passes through the intermembrane space, and re-enters the pipe on the liquid discharge port side of the baffle. In this way, by complicating the flow of the liquid by the baffle, the degassing performance can be improved compared to the case where there is no baffle.

[0009] By the way, unlike the plurality of hollow fiber membranes, the warp threads of the hollow fiber membrane fabric do not contribute to the degassing of the liquid, but rather inhibit the flow of the liquid. For this reason, conventionally, the diameter of the warp threads has been made extremely small compared to the respective diameters of the plurality of hollow fiber membranes. However, as a result of the intensive studies by the present inventors, it has been found that when the porosity remains unchanged, the pressure loss of the liquid can be reduced by increasing the ratio of the diameter of the warp threads to the respective diameters of the plurality of hollow fiber membranes. That is, by setting the ratio of the diameter of the warp threads to the respective diameters of the plurality of hollow fiber membranes to 0.6 or more, when the plurality of hollow fiber membranes are pressed against the pipe side by the flow of the liquid that re-enters the pipe beyond the baffle, the degree of decrease in the intermembrane space between the plurality of hollow fiber membranes can be reduced. Thereby, the pressure loss of the liquid can be reduced.

[0010] The ratio of the diameter of the warp threads to the respective diameters of the plurality of hollow fiber membranes may be 1.5 or less. Thus, by setting the ratio of the diameter of the warp threads to the respective diameters of the plurality of hollow fiber membranes to 1.5 or less, it is possible to suppress the number of the plurality of hollow fiber membranes accommodated in the housing and the membrane area of the plurality of hollow fiber membranes from becoming too small.

[0011] The diameter of the warp threads may be 50 μm or more. Thus, by setting the diameter of the warp threads to 50 μm or more, when the plurality of hollow fiber membranes are pressed against the pipe side by the flow of the liquid that re-enters the pipe beyond the baffle, a space is likely to remain between the outer peripheral side hollow fiber membrane and the inner peripheral side hollow fiber membrane. Thereby, the pressure loss of the liquid can be appropriately reduced.

[0012] The diameter of the warp threads may be 300 μm or less. Thus, by setting the diameter of the warp threads to 300 μm or less, it is possible to suppress the number of the plurality of hollow fiber membranes accommodated in the housing and the membrane area of the plurality of hollow fiber membranes from becoming too small.

[0013] The diameter of each of the plurality of hollow fiber membranes may be 50 μm or more and 500 μm or less. In this way, by setting the diameter of each of the plurality of hollow fiber membranes to be 50 μm or more and 500 μm or less, while suppressing the breakage of the plurality of hollow fiber membranes, the number of the plurality of hollow fiber membranes accommodated in the housing and the membrane area of the plurality of hollow fiber membranes can be sufficiently ensured.

[0014] The ratio of the pitch of the warp threads to the diameter of each of the plurality of hollow fiber membranes may be 600 or less. In this way, by setting the ratio of the pitch of the warp threads to the diameter of each of the plurality of hollow fiber membranes to be 600 or less, the pressure loss of the liquid in which the plurality of hollow fiber membranes are pressed against the pipe side by the flow of the liquid that re-enters the pipe beyond the baffle can be further reduced.

[0015] The ratio of the pitch of the warp threads to the diameter of each of the plurality of hollow fiber membranes may be 2 or more. In this way, by setting the ratio of the pitch of the warp threads to the diameter of each of the plurality of hollow fiber membranes to be 2 or more, the pressure loss of the liquid passing through the warp threads can be reduced.

[0016] The pitch of the warp threads may be 30 mm or less. In this way, by setting the pitch of the warp threads to be 30 mm or less, when the plurality of hollow fiber membranes are pressed against the pipe side by the flow of the liquid that re-enters the pipe beyond the baffle, the degree of deformation of each of the plurality of hollow fiber membranes can be reduced. Thereby, the pressure loss of the liquid can be appropriately reduced.

[0017] The pitch of the warp threads may be 1 mm or more. In this way, by setting the pitch of the warp threads to be 1 mm or more, the pressure loss of the liquid passing through the warp threads can be appropriately reduced.

[0018] The region between the housing and the pipe in the orthogonal cross-section orthogonal to the extending direction is defined as the accommodation region, and the region excluding the plurality of hollow fiber membranes between the housing and the pipe in the orthogonal cross-section is defined as the space region. In this case, the porosity, which is the ratio of the area of the space region to the area of the accommodation region, may be 30% or more and 80% or less. By setting the porosity, which is the ratio of the area of the space region to the area of the accommodation region, to 30% or more and 80% or less in this way, it is possible to reduce the pressure loss of the liquid while sufficiently securing the number of the plurality of hollow fiber membranes accommodated in the housing and the membrane area of the plurality of hollow fiber membranes.

[0019] The baffle may include an inner baffle disposed on the inner peripheral side of the pipe to partition the inner flow path of the pipe in the extending direction, and an outer baffle disposed on the outer peripheral side of the pipe to partition the intermembrane space in the extending direction. In this degassing module, since the baffle has an inner baffle disposed on the inner peripheral side of the pipe and an outer baffle disposed on the outer peripheral side of the pipe, the baffle can be disposed without dividing the pipe in the extending direction.

[0020] The partitioning portion has a first sealing portion disposed at a first end portion on one side of the hollow fiber membrane group in the extending direction, and a second sealing portion disposed at a second end portion on the other side of the hollow fiber membrane group in the extending direction. Each of the first sealing portion and the second sealing portion is filled in the entire region between the pipe and the housing excluding the plurality of hollow fiber membranes in the orthogonal cross-section orthogonal to the extending direction. The plurality of holes of the pipe may be formed between the first sealing portion and the second sealing portion in the extending direction. In this degassing module, each of the first sealing portion and the second sealing portion is filled in the entire region between the pipe and the housing excluding the plurality of hollow fiber membranes in the orthogonal cross-section orthogonal to the extending direction, and the plurality of holes of the pipe are formed between the first sealing portion and the second sealing portion. Therefore, the first sealing portion and the second sealing portion can partition the region inside the housing into an inner region and an outer region. And since the first sealing portion and the second sealing portion are disposed at the first end portion on one side and the second end portion on the other side of the hollow fiber membrane group in the extending direction, the liquid can be brought into contact with the plurality of hollow fiber membranes in a long range in the extending direction.

[0021] The intake port may have a first intake port formed on the side opposite to the second sealing portion of the first sealing portion in the extending direction, and a second intake port formed on the side opposite to the first sealing portion of the second sealing portion in the extending direction. In this degassing module, since the first intake port and the second intake port are formed outside the first sealing portion and the second sealing portion in the extending direction, the inner peripheral side spaces of the plurality of hollow fiber membranes can be intake air from both ends of the plurality of hollow fiber membranes. Thereby, the degassing efficiency of the liquid can be improved.

[0022] The method for degassing a liquid according to one aspect of the present invention is to intake air from the intake port into the internal region and supply the liquid from the liquid supply port to the internal flow path in the pipe in any of the above-described degassing modules. In this method for degassing a liquid, since the liquid is degassed using any of the above-described degassing modules, the pressure loss of the liquid can be reduced.

Effects of the Invention

[0023] According to one aspect of the present invention, the pressure loss of the liquid can be reduced.

Brief Description of the Drawings

[0024]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Mode for Carrying Out the Invention

[0025] Hereinafter, with reference to the drawings, the degassing module and the degassing method of the liquid according to the embodiment will be described. In all the drawings, the same or corresponding parts are denoted by the same reference numerals, and redundant descriptions are omitted.

[0026] 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 shown in FIG. 1. FIGS. 3 to 5 are schematic cross-sectional views showing a part of the degassing module shown in FIG. 1 enlarged. As shown in FIGS. 1 to 5, the degassing module 1 according to the embodiment is a module for degassing a liquid L. The liquid L to be degassed by the degassing module 1 is not particularly limited, and examples thereof include water such as seawater, drinking water, pure water, and ultrapure water, an aqueous solution in which ammonium sulfate, a surfactant, etc. are dissolved, an organic solvent such as alcohol and hydrocarbon, and an ionic liquid.

[0027] The degassing module 1 includes a pipe 2, a hollow fiber membrane group 3, a housing 4, a partition portion 5, and a baffle 6.

[0028] The pipe 2 is a cylindrical member extending linearly along the central axis A. The direction in which the pipe 2 extends in a cylindrical shape, that is, the direction of the central axis A, is referred to as the extending direction D. The pipe 2 forms a pipe internal flow path 23 having a liquid supply port 21 and a liquid discharge port 22. The pipe internal flow path 23 is a flow path formed by the inner peripheral surface of the pipe 2 through which the liquid L can flow.

[0029] A plurality of holes 24 for opening the pipe internal flow path 23 are formed in the pipe 2. The plurality of holes 24 are holes for discharging the liquid L from the pipe internal flow path 23 to the outside of the pipe 2 and for introducing the liquid L from the outside of the pipe 2 into the pipe internal flow path 23.

[0030] The pipe 2 has a hole forming portion 25, a first non-hole forming portion 26, and a second non-hole forming portion 27. The hole forming portion 25 is a portion where a plurality of holes 24 are formed. The first non-hole forming portion 26 and the second non-hole forming portion 27 are portions where a plurality of holes 24 are not formed. The hole forming portion 25 is located at the central portion of the pipe 2 in the extending direction D. The first non-hole forming portion 26 is adjacent to the liquid supply port 21 side of the hole forming portion 25 in the extending direction D. The second non-hole forming portion 27 is adjacent to the liquid discharge port 22 side of the hole forming portion 25 in the extending direction D.

[0031] The inner diameter and outer diameter of the hole forming portion 25, the first non-hole forming portion 26, and the second non-hole forming portion 27 are not particularly limited. For example, from the viewpoint of increasing the total area of the plurality of holes 24, the inner diameter and outer diameter of the hole forming portion 25 may be larger than the inner diameter and outer diameter of the first non-hole forming portion 26 and the second non-hole forming portion 27. For example, the hole forming portion 25, the first non-hole forming portion 26, and the second non-hole forming portion 27 are separate members, and the pipe 2 may be configured by inserting the small-diameter first non-hole forming portion 26 and the second non-hole forming portion 27 into both ends of the large-diameter hole forming portion 25.

[0032] The hollow fiber membrane group 3 is formed by winding a hollow fiber membrane fabric 8 around the outer peripheral side of the pipe 2 so as to cover a plurality of holes 24. That is, the hollow fiber membrane group 3 is constituted by the hollow fiber membrane fabric 8 disposed on the outer peripheral side of the pipe 2 so as to cover a plurality of holes 24.

[0033] FIG. 6 is a schematic view showing a part of the hollow fiber membrane fabric. As shown in FIG. 6, the hollow fiber membrane fabric 8 has a plurality of hollow fiber membranes 31 as weft threads and warp threads 9. The hollow fiber membrane fabric 8 is configured by weaving a plurality of hollow fiber membranes 31 arranged substantially in parallel and warp threads 9 extending in a direction substantially orthogonal to the plurality of hollow fiber membranes 31. The weaving structure of the plurality of hollow fiber membranes 31 and the warp threads 9 is not particularly limited, and various weaving structures can be adopted. And the hollow fiber membrane fabric 8 is wound around the pipe 2 so that the plurality of hollow fiber membranes 31 extend in the extending direction D in the same manner as the pipe 2.

[0034] Each of the plurality of hollow fiber membranes 31 is a hollow fiber-shaped membrane that allows gas G to permeate but does not allow liquid L to permeate. The material, membrane shape, membrane form, etc. of each of the plurality of hollow fiber membranes 31 are not particularly limited. Examples of the material of each of the plurality of hollow fiber membranes 31 include polyolefin resins such as polypropylene, polyethylene, and polymethylpentene, silicone resins such as polydimethylsiloxane and its copolymers, fluorine-based resins such as PTFE and vinylidene fluoride. Examples of the membrane shape (shape of the side wall) of each of the plurality of hollow fiber membranes 31 include a porous membrane, a microporous membrane, and a homogeneous membrane (non-porous membrane) without porosity. Examples of the membrane form of each of the plurality of hollow fiber membranes 31 include a symmetric membrane (homogeneous membrane) in which the chemical or physical structure of the entire membrane is homogeneous, and an asymmetric membrane (heterogeneous membrane) in which the chemical or physical structure of the membrane varies depending on the part of the membrane. The asymmetric membrane (heterogeneous membrane) is a membrane having a non-porous dense layer and porosity. In this case, the dense layer may be formed anywhere in the membrane, such as the surface layer portion of the membrane or inside the porous membrane. The heterogeneous membrane includes a composite membrane with different chemical structures and a multilayer structure membrane such as a three-layer structure. In particular, a heterogeneous membrane using poly-4-methylpentene-1 resin is particularly preferable because it has a dense layer that blocks liquid L. When used in an external perfusion type, it is preferable that the dense layer is formed on the outer surface.

[0035] As shown in FIGS. 1 to 5, the hollow fiber membrane group 3 is arranged on the outer peripheral side of the hole forming portion 25 of the pipe 2 and is not arranged on the outer peripheral side of the first non-hole forming portion 26 and the second non-hole forming portion 27 of the pipe 2. That is, the hollow fiber membrane group 3 is configured by winding a hollow fiber membrane fabric around the hole forming portion 25. For this reason, the hollow fiber membrane group 3 is formed in a substantially cylindrical shape.

[0036] In the hollow fiber membrane group 3, an intermembrane space S1 through which the liquid L can flow is formed between a plurality of hollow fiber membranes 31 (between adjacent hollow fiber membranes 31). The intermembrane space S1 is also formed between a plurality of hollow fiber membranes 31 in the circumferential direction of the pipe 2, and is also formed between a plurality of hollow fiber membranes 31 in the circumferential direction of the pipe 2. That is, the intermembrane space S1 is also formed between adjacent hollow fiber membranes 31 in the hollow fiber membrane fabric 8, and is also formed between the hollow fiber membranes 31 (inner peripheral side hollow fiber membranes 31) in the inner peripheral side hollow fiber membrane fabric 8 and the hollow fiber membranes 31 (outer peripheral side hollow fiber membranes 31) in the outer peripheral side hollow fiber membrane fabric 8.

[0037] The housing 4 is connected to the outer peripheral surface of the pipe 2 and houses the hollow fiber membrane group 3. The housing 4 is formed in a cylindrical shape extending in the extending direction D of the pipe 2. Both end portions of the housing 4 in the extending direction D are airtightly connected to the outer peripheral surface of the pipe 2. The connection of the housing 4 to the pipe 2 can be performed, for example, by welding, adhesion, or the like. Both end portions of the pipe 2 do not have to protrude from the housing 4, but in the present embodiment, from the viewpoint of ease of connection of other members to the pipe 2, both end portions of the pipe 2 protrude from the housing 4.

[0038] An air inlet 41 is formed in the housing 4. The air inlet 41 is an opening for sucking air from the housing 4. The air inlet 41 is composed of a first air inlet 42 and a second air inlet 43. Each of the first air inlet 42 and the second air inlet 43 is an opening for sucking air from the housing 4. A suction device (not shown), such as a vacuum pump, is connected to the first air inlet 42 and the second air inlet 43.

[0039] Inside the housing 4, a liquid flow space S2 is formed. The liquid flow space S2 is a space through which the liquid L can flow between the hollow fiber membrane group 3 and the housing 4. The liquid flow space S2 is a space formed between the hollow fiber membrane group 3 and the housing 4, at least in the unused state of the degassing module 1. Therefore, in the unused state of the degassing module 1, the hollow fiber membrane group 3 is not in contact with the inner peripheral surface of the housing 4. Note that after use of the degassing module 1, due to the swelling of the plurality of hollow fiber membranes 31, the hollow fiber membrane group 3 may come into contact with the inner peripheral surface of the housing 4.

[0040] The partition portion 5 partitions the region inside the housing 4 into an inner region R1 and an outer region R2. The inner region R1 is a region including the inner peripheral side spaces 32 of the plurality of hollow fiber membranes 31. The outer region R2 is a region including the intermembrane space S1. Therefore, each of the plurality of hollow fiber membranes 31 serves as a boundary between the inner region R1 and the outer region R2. And each of the plurality of hollow fiber membranes 31 blocks the passage of the liquid L from the outer region R2 to the inner region R1 and allows the passage of the gas G (dissolved gas in the liquid L, bubbles contained in the liquid L, etc.) from the outer region R2 to the inner region R1.

[0041] The partition portion 5 has a first sealing portion 51 and a second sealing portion 52. The first sealing portion 51 is disposed at the first end portion 33 on one side of the hollow fiber membrane group 3 in the extending direction D. The first end portion 33 is the end portion on the liquid supply port 21 side in the extending direction D. The first end portion 33 of the hollow fiber membrane group 3 is fixed to the outer peripheral surface of the pipe 2 and the inner peripheral surface of the housing 4 by the first sealing portion 51. The second sealing portion 52 is disposed at the second end portion 34 on the other side of the hollow fiber membrane group 3 in the extending direction D. The second end portion 34 is the end portion on the liquid discharge port 22 side in the extending direction D. The second end portion 34 of the hollow fiber membrane group 3 is fixed to the outer peripheral surface of the pipe 2 and the inner peripheral 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, resin. Examples of the resin used for the first sealing portion 51 and the second sealing portion 52 include epoxy resin, urethane resin, ultraviolet curable resin, and polyolefin resins such as polyethylene and polypropylene.

[0042] Each of the first sealing portion 51 and the second sealing portion 52 is filled in the entire area between the pipe 2 and the housing 4, excluding the plurality of hollow fiber membranes 31, in a cross-sectional plane orthogonal to the extending direction D. That is, each of the first sealing portion 51 and the second sealing portion 52 is filled between the pipe 2 and the hollow fiber membrane group 3, between the plurality of hollow fiber membranes 31, and between the hollow fiber membrane group 3 and the housing 4. And, the inner peripheral space 32 of each of the plurality of hollow fiber membranes 31 is open to the liquid supply port 21 side from the first sealing portion 51 and is open to the liquid discharge port 22 side from the second sealing portion 52.

[0043] The first sealing portion 51 is disposed between the hole forming portion 25 and the first non-hole forming portion 26 in the extending direction D. The second sealing portion 52 is disposed between the hole forming portion 25 and the second non-hole forming portion 27 in the extending direction D. That is, the plurality of holes 24 of the pipe 2 are formed between the first sealing portion 51 and the second sealing portion 52 in the extending direction D. For this reason, the region on the liquid supply port 21 side of the first sealing portion 51 between the pipe 2 and the housing 4 becomes the internal region R1. Also, the region on the liquid discharge port 22 side of the second sealing portion 52 between the pipe 2 and the housing 4 becomes the internal region R1.

[0044] The first air inlet 42 is disposed on the side opposite to the second sealing portion 52 of the first sealing portion 51 in the extending direction D, that is, on the liquid supply port 21 side of the first sealing portion 51 in the extending direction D. And, the first air inlet 42 communicates with the internal region R1 located on the liquid supply port 21 side of the first sealing portion 51 between the pipe 2 and the housing 4. The second air inlet 43 is disposed on the side opposite to the first sealing portion 51 of the second sealing portion 52 in the extending direction D, that is, on the liquid discharge port 22 side of the second sealing portion 52 in the extending direction D. And, the second air inlet 43 communicates with the internal region R1 located on the liquid discharge port 22 side of the second sealing portion 52 between the pipe 2 and the housing 4.

[0045] The baffle 6 is disposed between the first sealing portion 51 and the second sealing portion 52 in the extending direction D in order to bypass the liquid L supplied to the liquid supply port 21 and bring it into contact with the plurality of hollow fiber membranes 31. Here, the region of the deaeration module 1 between the first sealing portion 51 and the baffle 6 in the extending direction D is referred to as the upstream portion 10, and the region of the deaeration module 1 between the baffle 6 and the second sealing portion 52 in the extending direction D is referred to as the downstream portion 11.

[0046] The baffle 6 partitions the in-pipe flow path 23 and the intermembrane space S1 in the extending direction D. More specifically, the baffle 6 partitions the in-pipe flow path 23 in the extending direction D and partitions the external region R2 in the extending direction D so that a baffle clearance C is formed between the baffle 6 and the housing 4. That is, the in-pipe flow path 23 is partitioned in the extending direction D by the baffle 6. Also, the intermembrane space S1 is partitioned in the extending direction D by the baffle 6. Further, the external region R2 is partitioned in the extending direction D by the baffle 6 so that a baffle clearance C is formed between the baffle 6 and the housing 4. For this reason, the liquid L supplied from the liquid supply port 21 to the in-pipe flow path 23 exits from the pipe 2 in the upstream portion 10, passes through the intermembrane space S1, passes through the baffle clearance C between the baffle 6 and the housing 4, and enters the pipe 2 through the intermembrane space S1 in the downstream portion 11.

[0047] The position of the baffle 6 in the extending direction D can be set to any position between the first sealing portion 51 and the second sealing portion 52. For example, from the viewpoint of reducing the pressure loss of the liquid L when bypassing the baffle 6, the baffle 6 can be disposed at the central portion when the space between the first sealing portion 51 and the second sealing portion 52 is divided into three in the extending direction D.

[0048] The baffle 6 has an inner baffle 61 and an outer baffle 62. The inner baffle 61 is disposed on the inner peripheral side of the pipe 2 and partitions the in-pipe flow path 23 in the extending direction D. The outer baffle 62 is disposed on the outer peripheral side of the pipe 2 and partitions at least a part of the intermembrane space S1 in the extending direction D.

[0049] The inner baffle 61 may completely partition the pipe inner flow path 23 in the extending direction D, or may incompletely partition the pipe inner flow path 23 in the extending direction D. That is, the inner baffle 61 may completely block the pipe inner flow path 23 so that the liquid L cannot pass from the pipe inner flow path 23 in the upstream portion 10 to the pipe inner flow path 23 in the downstream portion 11. Further, the inner baffle 61 may partially block the pipe inner flow path 23 so that the liquid L can pass from the pipe inner flow path 23 in the upstream portion 10 to the pipe inner flow path 23 in the downstream portion 11. Even if the inner baffle 61 partially blocks the pipe inner flow path 23, since the passage of the liquid L from the pipe inner flow path 23 in the upstream portion 10 to the pipe inner flow path 23 in the downstream portion 11 is partially inhibited by the inner baffle 61, the liquid L supplied to the liquid supply port 21 can be bypassed and brought into contact with the plurality of hollow fiber membranes 31.

[0050] The inner baffle 61 is formed of, for example, resin. Examples of the resin used for the inner baffle 61 include urethane resins such as polyurethane (PU) and thermoplastic polyurethane (TPU); polycarbonate (PC); vinyl chloride resins such as polyvinyl chloride (PVC) and vinyl chloride-vinyl acetate copolymer resin; acrylic resins such as polyacrylic acid, polymethacrylic acid, methyl polyacrylate, polymethyl methacrylate (PMMA), and ethyl polymethacrylate; polyester resins such as polyethylene terephthalate (PET), polybutylene terephthalate, polytrimethylene terephthalate, polyethylene naphthalate, and polybutylene naphthalate; polyamide resins such as nylon (registered trademark); polystyrene resins such as polystyrene (PS), imide-modified polystyrene, acrylonitrile-butadiene-styrene (ABS) resin, imide-modified ABS resin, styrene-acrylonitrile copolymer (SAN) resin, and acrylonitrile-ethylene-propylene-diene-styrene (AES) resin; olefin resins such as polyethylene (PE) resin, polypropylene (PP) resin, polymethylpentene (PMP) resin, and cycloolefin resin; cellulose resins such as nitrocellulose and cellulose acetate; silicone resins; fluorine resins; thermoplastic resins such as polyphenylene ether (PPE) resin, and epoxy (EPOXY) resins such as bisphenol A type epoxy resin, bisphenol F type epoxy resin, isocyanurate type epoxy resin, and hydantoin type epoxy resin; amino resins such as melamine resin and urea resin; phenolic resins; and thermosetting resins such as unsaturated polyester resin. Among these, PP, PE, EPOXY, PC, ABS, PPE, PMMA, PMP, and PU are preferably mentioned.

[0051] The outer baffle 62 is disposed in the intermembrane space S1 (between the plurality of hollow fiber membranes 31) and partitions the intermembrane space S1 in the extending direction D. The outer baffle 62 may completely partition the intermembrane space S1 in the extending direction D or may incompletely partition the intermembrane space S1 in the extending direction D. That is, the outer baffle 62 may completely block the intermembrane space S1 so that the liquid L cannot pass from the intermembrane space S1 in the upstream portion 10 to the intermembrane space S1 in the downstream portion 11. Further, the outer baffle 62 may partially block the intermembrane space S1 so that the liquid L can pass from the intermembrane space S1 in the upstream portion 10 to the intermembrane space S1 in the downstream portion 11. Even if the outer baffle 62 partially blocks the intermembrane space S1, the passage of the liquid L from the intermembrane space S1 in the upstream portion 10 to the intermembrane space S1 in the downstream portion 11 is partially inhibited by the outer baffle 62, so that the liquid L supplied to the liquid supply port 21 can be bypassed and brought into contact with the plurality of hollow fiber membranes 31.

[0052] The outer baffle 62 may also be disposed in the pipe-side space S3, which is the space between the pipe 2 and the hollow fiber membrane group 3, and partition the pipe-side space S3 in the extending direction D. In this case, the outer baffle 62 may completely partition the pipe-side space S3 in the extending direction D or may incompletely partition the pipe-side space S3 in the extending direction D. That is, the outer baffle 62 may completely block the pipe-side space S3 so that the liquid L cannot pass from the pipe-side space S3 in the upstream portion 10 to the pipe-side space S3 in the downstream portion 11. Further, the outer baffle 62 may partially block the pipe-side space S3 so that the liquid L can pass from the pipe-side space S3 in the upstream portion 10 to the pipe-side space S3 in the downstream portion 11. Note that if a part of the liquid L supplied to the liquid supply port 21 can be bypassed and brought into contact with the plurality of hollow fiber membranes 31, the outer baffle 62 may not be disposed in the pipe-side space S3 and may not partition the pipe-side space S3 in the extending direction D.

[0053] The outer baffle 62 is spaced apart from the housing 4. However, if a baffle clearance C is formed even in a part between the outer baffle 62 and the housing 4, the outer baffle 62 may be in contact with the housing 4. Also, although the outer baffle 62 is not disposed in the liquid flow space S2, if a baffle clearance C is formed even in a part between the outer baffle 62 and the housing 4, it may be disposed in the liquid flow space S2.

[0054] The outer baffle 62 is formed of, for example, resin. Examples of the resin used for the outer baffle 62 include urethane resins such as polyurethane (PU) and thermoplastic polyurethane (TPU); polycarbonate (PC); vinyl chloride resins such as polyvinyl chloride (PVC) and vinyl chloride-vinyl acetate copolymer resin; acrylic resins such as polyacrylic acid, polymethacrylic acid, methyl polyacrylate, polymethyl methacrylate (PMMA), and ethyl polymethacrylate; polyester resins such as polyethylene terephthalate (PET), polybutylene terephthalate, polytrimethylene terephthalate, polyethylene naphthalate, and polybutylene naphthalate; polyamide resins such as nylon (registered trademark); polystyrene (PS) resins such as imide-modified polystyrene, acrylonitrile-butadiene-styrene (ABS) resin, imide-modified ABS resin, styrene-acrylonitrile copolymer (SAN) resin, and acrylonitrile-ethylene-propylene-diene-styrene (AES) resin; olefin resins such as polyethylene (PE) resin, polypropylene (PP) resin, polymethylpentene (PMP) resin, and cycloolefin resin; cellulose resins such as nitrocellulose and cellulose acetate; silicone resins; fluorine resins; thermoplastic resins such as polyphenylene ether (PPE) resin, and epoxy (EPOXY) resins such as bisphenol A type epoxy resin, bisphenol F type epoxy resin, isocyanurate type epoxy resin, and hydantoin type epoxy resin; amino resins such as melamine resin and urea resin; phenolic resins; and thermosetting resins such as unsaturated polyester resin. Among these, PP, PE, PVC, EPOXY, PMP, and PU are preferably mentioned.

[0055] FIG. 7 and FIG. 8 are schematic cross-sectional views for explaining an example of a method for forming the baffle 6. When forming the baffle 6, first, as shown in FIG. 7, a resin disk-shaped member 12 is fitted into the pipe inner flow path 23 of the pipe 2. This disk-shaped member becomes the inner baffle 61.

[0056] Next, as shown in FIGS. 7 and 8, the hollow fiber membrane fabric 8 is wound around the pipe 2 so as to cover a plurality of holes 24 of the pipe 2. At this time, when the surface of the hollow fiber membrane fabric 8 on the side wound around the pipe 2 is defined as the fabric inner surface 8a, the molten resin 13 is applied to a position corresponding to the outer baffle 62 of the fabric inner surface 8a. Then, the hollow fiber membrane fabric 8 to which the molten resin 13 is applied is wound around the pipe 2. Then, the molten resin 13 is impregnated into the inner layer side hollow fiber membrane fabric 8 and the outer layer side hollow fiber membrane fabric 8 and is filled in a state corresponding to the outer baffle 62. After that, when the molten resin 13 hardens, the molten resin 13 becomes the outer baffle 62.

[0057] Next, a method for degassing the liquid L using the degassing module 1 will be described.

[0058] The internal region R1 is sucked from the first intake port 42 and the second intake port 43, and the liquid L is supplied from the liquid supply port 21 to the pipe inner flow path 23. The intake of the internal region R1 from the first intake port 42 and the second intake port 43 can be performed, for example, by connecting a suction device (not shown) such as a vacuum pump to the first intake port 42 and the second intake port 43 and operating this suction device. Then, by sucking the internal region R1 from the first intake port 42 and the second intake port 43, the internal region R1 including the inner peripheral side spaces 32 of the plurality of hollow fiber membranes 31 is in a decompressed state.

[0059] Then, the liquid supplied to the pipe internal flow path 23 exits the pipe 2 through a plurality of holes 24 formed in the pipe 2 in the upstream portion 10 so as to bypass the baffle 6, and passes through the intermembrane space S1. At this time, since the inner peripheral side spaces 32 of each of the plurality of hollow fiber membranes 31 are in a decompressed state, the dissolved gas in the liquid L and the gas G such as bubbles contained in the liquid L pass through each of the plurality of hollow fiber membranes 31, whereby the liquid L is degassed. Thereafter, the liquid L passes through the baffle clearance C, passes through the intermembrane space S1 in the downstream portion 11, and enters the pipe 2 through a plurality of holes 24 formed in the pipe 2. Also at this time, since the inner peripheral side spaces 32 of each of the plurality of hollow fiber membranes 31 are in a decompressed state, the dissolved gas in the liquid L and the gas G such as bubbles contained in the liquid L pass through each of the plurality of hollow fiber membranes 31, whereby the liquid L is degassed. Thereafter, the degassed liquid L that has entered the pipe 2 is discharged from the liquid discharge port 22.

[0060] As described above, in the degassing module 1 according to the present embodiment, by sucking air into the internal region R1 from the first air inlet 42 and the second air inlet 43 and supplying the liquid L to the pipe internal flow path 23 from the liquid supply port 21, the liquid L can be degassed. And the pipe internal flow path 23 and the intermembrane space S1 are partitioned in the extending direction D by the baffle 6. For this reason, when the liquid L is supplied from the liquid supply port 21 to the pipe internal flow path 23, the liquid L exits the pipe 2 on the liquid supply port 21 side of the baffle 6, passes through the intermembrane space S1, passes through the baffle clearance C between the baffle 6 and the housing 4, passes through the intermembrane space S1, and enters the pipe 2 again on the liquid discharge port 22 side of the baffle 6. Thus, by making the flow of the liquid L complex by the baffle 6, the degassing performance can be improved as compared with the case where the baffle 6 is not provided.

[0061] Incidentally, unlike the plurality of hollow fiber membranes 31, the warp 9 of the hollow fiber fabric 8 does not contribute to the degassing of the liquid L. On the contrary, it obstructs the flow of the liquid. For this reason, conventionally, the diameter of the warp has been made extremely small compared to the respective diameters of the plurality of hollow fiber membranes. However, as a result of intensive studies by the present inventors, it has been found that when the porosity remains unchanged, the pressure loss of the liquid L can be reduced by increasing the ratio of the diameter D2 of the warp 9 to the diameter D1 of each of the plurality of hollow fiber membranes 31.

[0062] With reference to FIGS. 2 and 9, the porosity will be described. FIG. 9 is a schematic cross-sectional view showing an enlarged part of FIG. 2. FIGS. 2 and 9 show a cross-section orthogonal to the extending direction D. As shown in FIGS. 2 and 9, the region between the housing 4 and the pipe 2 in the cross-section orthogonal to the extending direction D is referred to as an accommodation region R3. The accommodation region R3 is a region including a plurality of hollow fiber membranes 31. Further, the region excluding the plurality of hollow fiber membranes 31 between the housing 4 and the pipe 2 in the cross-section orthogonal to the extending direction D is referred to as a space region R4. The space region R4 is a region obtained by removing the region hatched with oblique lines in FIG. 9 from the accommodation region R3. Then, the ratio of the area of the space region R4 to the area of the accommodation region R3 (area ratio of the space region R4 / area of the accommodation region R3) is referred to as the porosity.

[0063] Therefore, in the degassing module 1 according to the present embodiment, the ratio of the diameter D2 of the warp to the diameter D1 of each of the plurality of hollow fiber membranes is 0.6 or more. That is, D2 / D1 is 0.6 or more. When this ratio of 0.6 is expressed as a percentage, it is 60%. In this case, the ratio of the diameter D2 to the diameter D1 may be 0.7 or more, or may be 0.8 or more. Thus, by setting the ratio of the diameter D2 to the diameter D1 to 0.6 or more, preferably 0.7 or more, more preferably 0.8 or more, when the plurality of hollow fiber membranes 31 are pressed toward the pipe 2 by the flow of the liquid L that re-enters the pipe 2 beyond the baffle 6, the degree of reduction of the intermembrane space S1 between the plurality of hollow fiber membranes 31 can be made small. Thereby, the pressure loss of the liquid L can be reduced.

[0064] The ratio of diameter D2 to diameter D1 may be 1.5 or less, may be 1 or less, or may be 0.8 or less. Note that when this ratio of 1.5 is expressed as a percentage, it is 150%. Thus, by setting the ratio of diameter D2 to diameter D1 to 1.5 or less, preferably 1 or less, and more preferably 0.8 or less, it is possible to suppress the number of the plurality of hollow fiber membranes 31 accommodated in the housing 4 and the membrane area of the plurality of hollow fiber membranes 31 from becoming too small.

[0065] The diameter D2 of the warp 9 may be 50 μm or more, may be 100 μm or more, or may be 150 μm or more. Thus, by setting the diameter D2 of the warp 9 to 50 μm or more, preferably 100 μm or more, and more preferably 150 μm or more, when the plurality of hollow fiber membranes 31 are pressed toward the pipe 2 by the flow of the liquid L that re-enters the pipe 2 beyond the baffle 6, a space is likely to remain between the hollow fiber membranes 31 on the outer peripheral side and the hollow fiber membranes 31 on the inner peripheral side. Thereby, the pressure loss of the liquid L can be appropriately reduced.

[0066] The diameter D2 of the warp 9 may be 300 μm or less, may be 250 μm or less, or may be 200 μm or less. Thus, by setting the diameter D2 of the warp 9 to 300 μm or less, preferably 250 μm or less, and more preferably 200 μm or less, it is possible to suppress the number of the plurality of hollow fiber membranes 31 accommodated in the housing 4 and the membrane area of the plurality of hollow fiber membranes 31 from becoming too small.

[0067] The diameter D1 of each of the plurality of hollow fiber membranes 31 may be 50 μm or more and 500 μm or less, may be 100 μm or more and 350 μm or less, or may be 150 μm or more and 250 μm or less. Thus, by setting the diameter D1 of each of the plurality of hollow fiber membranes 31 to 50 μm or more and 500 μm or less, preferably 100 μm or more and 350 μm or less, and more preferably 150 μm or more and 250 μm or less, it is possible to sufficiently secure the number of the plurality of hollow fiber membranes 31 accommodated in the housing 4 and the membrane area of the plurality of hollow fiber membranes 31 while suppressing breakage of the plurality of hollow fiber membranes 31.

[0068] The ratio of the pitch P of the warp threads 9 to the diameter D1 of each of the plurality of hollow fiber membranes 31 may be 600 or less, may be 100 or less, or may be 40 or less. That is, P / D1 may be 600 or less, 100 or less, or 40 or less. Note that when this ratio of 600 is expressed as a percentage, it is 60000%. In this way, by setting the ratio of the pitch P to the diameter D1 to 600 or less, preferably 100 or less, and more preferably 40 or less, when the plurality of hollow fiber membranes 31 are pressed toward the pipe 2 by the flow of the liquid L that re-enters the pipe 2 beyond the baffle 6, the degree of deformation of each of the plurality of hollow fiber membranes can be reduced. Thereby, the pressure loss of the liquid L can be further reduced.

[0069] The ratio of the pitch P of the warp threads 9 to the diameter D1 of each of the plurality of hollow fiber membranes 31 may be 2 or more, may be 5.7 or more, or may be 16 or more. That is, P / D1 may be 2 or more, 5.7 or more, or 16 or more. Note that when this ratio of 2 is expressed as a percentage, it is 200%. In this way, by setting the ratio of the pitch P to the diameter D1 to 2 or more, preferably 5.7 or more, and more preferably 16 or more, the pressure loss of the liquid L passing through the warp threads 9 can be reduced.

[0070] The pitch P of the warp threads 9 may be 30 mm or less, may be 10 mm or less, or may be 6 mm or less. In this way, by setting the pitch P to 30 mm or less, preferably 10 mm or less, and more preferably 6 mm or less, when the plurality of hollow fiber membranes 31 are pressed toward the pipe 2 by the flow of the liquid L that re-enters the pipe 2 beyond the baffle 6, the degree of deformation of each of the plurality of hollow fiber membranes 31 can be reduced. Thereby, the pressure loss of the liquid L can be appropriately reduced.

[0071] The pitch P of the warp threads 9 may be 1 mm or more, may be 2 mm or more, or may be 4 mm or more. In this way, by setting the pitch P to 1 mm or more, preferably 2 mm or more, and more preferably 4 mm or more, the pressure loss of the liquid L passing through the warp threads 9 can be appropriately reduced.

[0072] The porosity, which is the ratio of the area of the space region R4 to the area of the accommodation region R3, may be 30% or more and 80% or less, may be 45% or more and 75% or less, or may be 60% or more and 70% or less. That is, (the area of the space region R4) / (the area of the accommodation region R3)×100 may be 30% or more and 80% or less, 45% or more and 75% or less, or 60% or more and 70% or less. In this way, by setting the porosity to 30% or more and 80% or less, preferably 45% or more and 75% or less, more preferably 60% or more and 70% or less, it is possible to reduce the pressure loss of the liquid L while sufficiently ensuring the number of the plurality of hollow fiber membranes 31 accommodated in the housing 4 and the membrane area of the plurality of hollow fiber membranes 31.

[0073] Further, in this degassing module 1, since the baffle 6 has an inner baffle 61 disposed on the inner peripheral side of the pipe 2 and an outer baffle 62 disposed on the outer peripheral side of the pipe 2, the baffle 6 can be disposed without dividing the pipe 2 in the extending direction D.

[0074] Further, in this degassing module 1, each of the first sealing portion 51 and the second sealing portion 52 is filled in the entire area excluding the plurality of hollow fiber membranes 31 between the pipe 2 and the housing 4 in a cross-sectional plane orthogonal to the extending direction D, and a plurality of holes 24 of the pipe 2 are formed between the first sealing portion 51 and the second sealing portion 52. Therefore, the first sealing portion 51 and the second sealing portion 52 can partition the region in the housing 4 into an inner region R1 and an outer region R2. And since the first sealing portion 51 and the second sealing portion 52 are disposed at the first end portion 33 and the second end portion 34 of the hollow fiber membrane group 3 in the extending direction D, the liquid L can be brought into contact with the plurality of hollow fiber membranes 31 in a long range in the extending direction D.

[0075] Further, in this degassing module 1, since the first air inlet 42 and the second air inlet 43 are formed outside the first sealing portion 51 and the second sealing portion 52 in the extending direction D, the inner peripheral side spaces 32 of the plurality of hollow fiber membranes 31 can be sucked from both ends of the plurality of hollow fiber membranes 31. Thereby, the degassing efficiency of the liquid L can be improved.

[0076] Further, in the method for degassing a liquid according to the present embodiment, since the degassing module 1 described above is used to degas the liquid L, the pressure loss of the liquid L can be reduced.

[0077] As described above, the preferred embodiments of one aspect of the present invention have been described, but one aspect of the present invention is not limited to the above embodiments. For example, in the above embodiments, the pipe and the housing are described as separate members, but if there are no manufacturing problems, the pipe and the housing may be integrated.

Example

[0078] Next, examples of one aspect of the present invention will be described, but one aspect of the present invention is not limited to the following examples.

[0079] (Comparative Example 1) As Comparative Example 1, a degassing module having the same configuration as the above embodiment was produced, except that the ratio of the diameter of the warp to the diameter of each of the plurality of hollow fiber membranes was 0.29. In the degassing module of Comparative Example 1, the diameter of each of the plurality of hollow fiber membranes was 210 μm, and the diameter of the warp was 60 μm (22 dtx), so that the ratio of the diameter of the warp to the diameter of each of the plurality of hollow fiber membranes was 0.29. Further, in the degassing module of Comparative Example 1, the pitch of the warp was 8.4 mm, so that the ratio of the pitch of the warp to the diameter of each of the plurality of hollow fiber membranes was 40 (40 times).

[0080] (Example 1) As Example 1, a degassing module having the same configuration as Comparative Example 1 was created, except that the ratio of the diameter of the warp to the diameter of each of the plurality of hollow fiber membranes was 0.71. In the degassing module of Example 1, the diameter of each of the plurality of hollow fiber membranes was 210 μm, and the diameter of the warp was 150 μm (56 dtx), so that the ratio of the diameter of the warp to the diameter of each of the plurality of hollow fiber membranes was 0.71. Further, in the degassing module of Example 1, the pitch of the warp was 8.4 mm, so that the ratio of the pitch of the warp to the diameter of each of the plurality of hollow fiber membranes was 40 (40 times).

[0081] (Example 2) As Example 2, a degassing module having the same configuration as that of Example 1 was created, except that the ratio of the warp pitch to the diameter of each of the plurality of hollow fiber membranes was set to 19 (19 times). In the degassing module of Example 2, the diameter of each of the plurality of hollow fiber membranes was 210 μm, and the diameter of the warp was 150 μm (56 dtx), so that the ratio of the diameter of the warp to the diameter of each of the plurality of hollow fiber membranes was 0.71. Further, in the degassing module of Example 2, by setting the warp pitch to 4.2 mm, the ratio of the warp pitch to the diameter of each of the plurality of hollow fiber membranes was set to 19 (19 times).

[0082] (Experiment 1) As Experiment 1, the pressure loss of the liquid was measured using each of the degassing modules of Comparative Example 1, Example 1, and Example 2. In Experiment 1, the flow rate of the liquid supplied to the degassing module was changed, and the pressure loss of the liquid from the liquid supply port to the liquid discharge port of the degassing module was measured. The measurement results are shown in FIG. 10. FIG. 10 is a graph showing the measurement results of the pressure loss.

[0083] As shown in FIG. 10, the pressure loss of the liquid was significantly smaller in the degassing module in which the ratio of the diameter of the warp to the diameter of each of the plurality of hollow fiber membranes was 0.71 than in the degassing module of Comparative Example 1 in which the ratio of the diameter of the warp to the diameter of each of the plurality of hollow fiber membranes was 0.29. For example, when the flow rate of the liquid supplied to the degassing module was 60 m 3 / h, the pressure loss of the liquid in the degassing module of Example 1 decreased by 37% compared to the pressure loss of the liquid in the degassing module of Comparative Example 1.

[0084] Further, the pressure loss of the liquid was significantly smaller in the degassing module of Example 2 in which the ratio of the warp pitch to the diameter of each of the plurality of hollow fiber membranes was 19 than in the degassing module of Example 1 in which the ratio of the warp pitch to the diameter of each of the plurality of hollow fiber membranes was 40. For example, when the flow rate of the liquid supplied to the degassing module was 70 m 3When it was set to / h, the pressure loss of the liquid in the degassing module of Example 2 decreased by 53% compared to the pressure loss of the liquid in the degassing module of Example 1.

Industrial Applicability

[0085] One aspect of the present invention can be used in a degassing module for degassing a liquid and a method for degassing a liquid.

Explanation of Reference Numerals

[0086] 1... Degassing module, 2... Pipe, 3... Hollow fiber membrane group, 4... Housing, 5... Partition portion, 6... Baffle, 8... Hollow fiber membrane fabric, 8a... Inner surface of the fabric, 9... Warp, 10... Upstream portion, 11... Downstream portion, 12... Disk-shaped member, 13... Melt resin, 21... Liquid supply port, 22... Liquid discharge port, 23... Inner flow path of the pipe, 24... Hole, 25... Hole forming portion, 26... First non-hole forming portion, 27... Second non-hole forming portion, 31... Hollow fiber membrane, 32... Inner peripheral side space, 33... First end portion, 34... Second end portion, 41... Air inlet, 42... First air inlet, 43... Second air inlet, 51... First sealing portion, 52... Second sealing portion, 61... Inner baffle, 62... Outer baffle, A... Central axis, C... Baffle clearance, D... Extending direction, D1... Diameter, D2... Diameter, G... Gas, L... Liquid, P... Pitch, R1... Inner region, R2... Outer region, R3... Accommodation region, R4... Space region, S1... Intermembrane space, S2... Liquid flow space, S3... Pipe side space.

Claims

1. A pipe having a pipe internal flow path with a liquid supply port and a liquid discharge port, and having a plurality of holes formed therein for opening the pipe internal flow path, A hollow fiber membrane group in which a hollow fiber membrane fabric having a plurality of hollow fiber membranes as weft threads and warp threads is wound around the outer peripheral side of the pipe so as to cover the plurality of holes, A housing connected to the outer peripheral surface of the pipe and accommodating the hollow fiber membrane group, A partition portion that partitions the region inside the housing into an internal region including the inner peripheral side spaces of the plurality of hollow fiber membranes and an external region including the intermembrane spaces between the plurality of hollow fiber membranes, An intake port of the housing communicated with the internal region, A baffle that partitions the pipe internal flow path and the intermembrane space in the extending direction of the pipe, and comprising: The ratio of the diameter of the warp thread to the diameter of each of the plurality of hollow fiber membranes is 0.6 or more. A degassing module.

2. The ratio of the diameter of the warp thread to the diameter of each of the plurality of hollow fiber membranes is 1.5 or less. The degassing module according to Claim 1.

3. The diameter of the warp thread is 50 μm or more. The degassing module according to Claim 1.

4. The diameter of the warp thread is 300 μm or less. The degassing module according to Claim 1.

5. The diameter of each of the plurality of hollow fiber membranes is 50 μm or more and 500 μm or less. The degassing module according to Claim 1.

6. The ratio of the pitch of the warp thread to the diameter of each of the plurality of hollow fiber membranes is 600 or less. The degassing module according to Claim 1.

7. The ratio of the pitch of the warp thread to the diameter of each of the plurality of hollow fiber membranes is 2 or more. The degassing module according to Claim 6.

8. The pitch of the warp thread is 30 mm or less. The degassing module according to Claim 1.

9. The pitch of the warp thread is 1 mm or more. The degassing module according to Claim 1.

10. Taking the region between the housing and the pipe in the orthogonal cross-section perpendicular to the extending direction as an accommodation region, and taking the region excluding the plurality of hollow fiber membranes between the housing and the pipe in the orthogonal cross-section as a space region, the porosity, which is the ratio of the area of the space region to the area of the accommodation region, is 30% or more and 80% or less. The degassing module according to Claim 1.

11. The baffle is An inner baffle disposed on the inner peripheral side of the pipe and partitioning the pipe internal flow path in the extending direction, An outer baffle disposed on the outer peripheral side of the pipe and partitioning the intermembrane space in the extending direction. The deaeration module according to claim 1.

12. The partitioning portion A first sealing portion disposed at a first end portion on one side of the hollow fiber membrane group in the extending direction; A second sealing portion disposed at a second end portion on the other side of the hollow fiber membrane group in the extending direction, and Each of the first sealing portion and the second sealing portion is filled in the entire area between the pipe and the housing, excluding the plurality of hollow fiber membranes, in an orthogonal cross-section orthogonal to the extending direction. The plurality of holes in the pipe are formed between the first sealing portion and the second sealing portion in the extending direction. The deaeration module according to claim 1.

13. The air inlet A first air inlet formed on the side opposite to the second sealing portion of the first sealing portion in the extending direction; A second air inlet formed on the side opposite to the first sealing portion of the second sealing portion in the extending direction, and The deaeration module according to claim 12.

14. In the deaeration module according to any one of claims 1 to 13, air is sucked from the air inlet into the internal region, and liquid is supplied from the liquid supply port into the internal flow path of the pipe. A method for deaerating a liquid.

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