Degassing module and method for degassing a liquid

Abstract

A degassing module comprises: multiple degassing elements, each having multiple hollow fiber membranes disposed around a liquid flow tube; a housing housing the multiple degassing elements; an element connecting portion connected to a first-side degassing element and a second-side degassing element, forming an intermediate connecting space and an intermediate liquid flow path, the intermediate connecting space communicating with hollow portions of the multiple hollow fiber membranes of the first-side degassing element and the second-side degassing element, the intermediate liquid flow path communicating with hollow portions of the liquid flow tubes of the first-side degassing element and the second-side degassing element; and a partition portion dividing a region within the housing into an inner region and an outer region by the multiple hollow fiber membranes. The housing has a liquid supply port, a liquid discharge port, and a gas port. The gas port is connected to the element connecting portion and communicates with the intermediate connecting space.

Description

Technical Field

[0001] This invention relates to a degassing module and a method for degassing liquids. Background Technology

[0002] A degassing module is known to degas liquids using a degassing element (hollow fiber unit) having multiple hollow fiber membranes (for example, see Patent Document 1).

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2003-038904 Summary of the Invention

[0006] The problem the invention aims to solve

[0007] In recent years, efforts to mitigate climate change have called for reducing the concentration of the greenhouse gas carbon dioxide in the atmosphere. As one approach, methods for removing or recovering carbon dioxide from seawater are being researched. Since seawater retains a significant amount of carbon dioxide, it is believed that reducing its concentration can lower the concentration in the atmosphere.

[0008] Liquid degassing is often performed using a purging mode. The purging mode degassing method involves supplying liquid to the outside of the hollow fiber membrane and supplying purge gas to the inside of the membrane. However, for removing high concentrations of gas from liquids, a vacuum mode is effective. The vacuum mode degassing method involves supplying liquid to the outside of the hollow fiber membrane and drawing air from the inside (vacuuming) the membrane. In the vacuum mode, the pressure difference across the hollow fiber membrane is greater than in the purging mode, resulting in more gas permeating the membrane.

[0009] To degas liquids at high flow rates, a degassing module as described in Patent Document 1 could be considered, in which multiple interconnected degassing elements are housed within a single housing for liquid degassing. However, in this degassing module, the gas port is only located at one end, resulting in a long exhaust path for the gas permeating through the multiple hollow fiber membranes. Furthermore, the hollow fiber membranes are elongated (thin and long) to increase the membrane area (contact area with the liquid), leading to high pressure loss of the fluid flowing within them. Therefore, it may be impossible to achieve sufficient exhaust efficiency for the gas permeating the hollow fiber membranes.

[0010] Therefore, the objective of this invention is to provide a degassing module and a liquid degassing method that can achieve a large flow rate of degassed liquid and improve gas discharge efficiency.

[0011] Solution for solving the problem

[0012] [1] The degassing module according to the present invention comprises: a plurality of degassing elements, having a liquid flow pipe having a plurality of openings and extending in an extending direction, and a plurality of hollow fiber membranes disposed around the liquid flow pipe in a manner covering the plurality of openings; a housing for accommodating the plurality of degassing elements in a manner in which the plurality of degassing elements are arranged in the extending direction; and an element connecting portion for connecting to a first-side degassing element and a second-side degassing element that are adjacent in the extending direction among the plurality of degassing elements, and forming an intermediate connecting space and an intermediate liquid flow path, wherein the intermediate connecting space is connected to the hollow portions of the plurality of hollow fiber membranes of the first-side degassing element and the hollow portions of the plurality of hollow fiber membranes of the second-side degassing element. The housing has a hollow section that connects to the hollow section of the liquid flow tube of the first-side degassing element and the hollow section of the liquid flow tube of the second-side degassing element; and a partition section that divides the area inside the housing into an inner region including a hollow section of multiple hollow fiber membranes and an outer region including a hollow section of liquid flow tubes, with multiple hollow fiber membranes as boundaries. The housing has: a liquid supply port for supplying liquid to the hollow section of the liquid flow tubes; a liquid discharge port for discharging liquid flowing out of the liquid flow tubes; and a gas port for discharging gas that has permeated through the multiple hollow fiber membranes. The gas port is connected to the element connection section and communicates with the intermediate communication space.

[0013] In this degassing module, multiple degassing elements are housed within a housing arranged in an extending direction. A connecting portion between the first-side and second-side degassing elements, which are adjacent in the extending direction, forms an intermediate connecting space and an intermediate liquid flow path. This intermediate connecting space communicates with the hollow portions of the multiple hollow fiber membranes of the first-side and second-side degassing elements. The intermediate liquid flow path communicates with the hollow portions of the liquid flow pipes of the first-side and second-side degassing elements. A partition divides the area within the housing into an internal region including the hollow portions of the multiple hollow fiber membranes and an external region including the hollow portions of the liquid flow pipes, with the multiple hollow fiber membranes as boundaries. The housing has: a liquid supply port for supplying liquid to the hollow portions of the liquid flow pipes; a liquid discharge port for discharging liquid flowing out of the liquid flow pipes; and a gas port for discharging gas that has permeated through the multiple hollow fiber membranes. Therefore, liquid can be degassed within multiple degassing elements, thus enabling a large flow rate of degassed liquid. Furthermore, in this degassing module, the gas port is connected to the element connection portion and communicates with the intermediate communication space. Therefore, compared to the case where the gas port is only located at one end of the degassing module, the discharge path length of the gas passing through multiple hollow fiber membranes can be shortened, and the imbalance between the discharge force of the gas acting on the first-side degassing element and the discharge force of the gas acting on the second-side hollow fiber membrane element can be mitigated. As a result, the degassing efficiency can be improved.

[0014] [2] In the degassing module described in [1], the plurality of degassing elements may include: a first-end degassing element located at the end of a first extension direction which is one direction in the extension direction; and a second-end degassing element located at the end of a second extension direction which is the opposite direction to the first extension direction in the extension direction. The end of the hollow portion of the liquid flow tube of the first-end degassing element in the first extension direction can be closed, and the liquid supply port can be connected to the end of the liquid flow tube of the second-end degassing element in the second extension direction. In this degassing module, the end of the hollow portion of the liquid flow tube of the first-end degassing element in the first extension direction is closed, and the liquid supply port is connected to the end of the liquid flow tube of the second-end degassing element in the second extension direction. Therefore, if liquid is supplied to the liquid supply port, the liquid is supplied to the hollow portion of the liquid flow tube in each degassing element, flows out from the outside of the liquid flow tube through the plurality of openings, and is degassed by contacting the plurality of hollow fiber membranes. Then, the liquid degassed by contacting the plurality of hollow fiber membranes does not return to the hollow portion of the liquid flow tube, but is discharged from the liquid discharge port. That is, the liquid does not flow in the direction that presses the multiple hollow fiber membranes against the liquid flow pipe, but rather in the direction that moves the multiple hollow fiber membranes away from the liquid flow pipe. This suppresses the increase in pressure loss as the liquid passes through the multiple hollow fiber membranes, thus preventing a decrease in liquid flow rate. As a result, for example, a liquid supply device with relatively low output can be used as the liquid supply device for supplying liquid to multiple degassing modules.

[0015] [3] The degassing module described in [2] may further include: a first end-connecting space forming part, which is connected to the end of the first end-degassing element in the first extension direction and forms a first end-connecting space communicating with the hollow portions of the plurality of hollow fiber membranes of the first end-degassing element; and a housing may have a first end gas port connected to the first end-connecting space forming part and communicating with the first end-connecting space. In this degassing module, the first end-connecting space forming part connected to the end of the first end-degassing element in the first extension direction forms a first end-connecting space communicating with the hollow portions of the plurality of hollow fiber membranes of the first end-degassing element, and the housing has a first end gas port connected to the first end-connecting space forming part and communicating with the first end-connecting space. Therefore, it is possible to draw gas from the hollow portions of the plurality of hollow fiber membranes from the first extension direction side of the first end-degassing element, or to supply purge gas to the hollow portions of the plurality of hollow fiber membranes. As a result, the degassing efficiency can be further improved.

[0016] [4] In the degassing module described in [2], a second end communication space communicating with the hollow portions of the plurality of hollow fiber membranes of the second end degassing element can be formed on the second extension direction side of the second end degassing element, and the housing can have a second end gas port adjacent to and communicating with the second end communication space. In this degassing module, a second end communication space communicating with the hollow portions of the plurality of hollow fiber membranes of the second end degassing element is formed on the second extension direction side of the second end degassing element, and the housing has a second end gas port adjacent to and communicating with the second end communication space. Therefore, it is possible to draw suction from the hollow portions of the plurality of hollow fiber membranes from the second extension direction side of the second end degassing element, or to supply purge gas to the hollow portions of the plurality of hollow fiber membranes. As a result, the degassing efficiency can be further improved.

[0017] [5] In the degassing module described in [2], it may further include: a first end-connecting space forming part, which is connected to the end of the first end-degassing element in the first extending direction and forms a first end-connecting space that communicates with the hollow portions of the plurality of hollow fiber membranes of the first end-degassing element; a second end-connecting space that communicates with the hollow portions of the plurality of hollow fiber membranes of the second end-degassing element may be formed on the second extending direction side of the second end-degassing element; and the housing may have: a first end gas port, which is connected to the first end-connecting space forming part and communicates with the first end-connecting space; and a second end gas port, which is adjacent to the second end-connecting space and communicates with the second end-connecting space. In this degassing module, the first end-connecting space forming part connected to the end of the first end-degassing element in the first extending direction forms a first end-connecting space that communicates with the hollow portions of the plurality of hollow fiber membranes of the first end-degassing element; and the housing has a first end gas port that is connected to the first end-connecting space forming part and communicates with the first end-connecting space. Furthermore, a second-end communication space is formed on the second-extending side of the second-end degassing element, communicating with the hollow portions of the plurality of hollow fiber membranes of the second-end degassing element. The housing has a second-end gas port adjacent to and communicating with the second-end communication space. Therefore, it is possible to draw or supply purge gas to the hollow portions of the plurality of hollow fiber membranes from the first-extending side of the first-end degassing element and the second-extending side of the second-end degassing element. This further improves the degassing efficiency.

[0018] [6] In any one of [2] to [5], each of the plurality of degassing elements may have: a first fixing part, located at the end in the first extending direction, i.e., the end of the first element, sealing between the liquid flow pipe and the plurality of hollow fiber membranes, and fixing the plurality of hollow fiber membranes to the liquid flow pipe in such a way that the hollow part of the liquid flow pipe and the hollow part of the plurality of hollow fiber membranes are open; and a second fixing part, located at the end in the second extending direction, i.e., the end of the second element, sealing between the liquid flow pipe and the plurality of hollow fiber membranes, and fixing the plurality of hollow fiber membranes to the liquid flow pipe in such a way that the hollow part of the liquid flow pipe and the hollow part of the plurality of hollow fiber membranes are open, and the element connecting part may have: a connecting cover, connected to the second fixing part of the first side degassing element and the first fixing part of the second side degassing element, and covering the space between the first side degassing element and the second side degassing element; and a connecting pipe, connected to the liquid flow pipe of the first side degassing element and the liquid flow pipe of the second side degassing element, and the gas port may be connected to the connecting cover. In this degassing module, the component connection portion includes: a connecting cover, which connects to the second fixing portion of the first-side degassing element and the first fixing portion of the second-side degassing element, and covers the space between the first-side and second-side degassing elements; and a connecting pipe, which connects to the liquid flow pipe of the first-side degassing element and the liquid flow pipe of the second-side degassing element. Therefore, the connecting pipe forms an intermediate liquid flow path, and the connecting cover and the connecting pipe form an intermediate connecting space. Furthermore, by connecting the gas port to the connecting cover, the gas port can be connected to the intermediate connecting space with a simple structure.

[0019] [7] The liquid degassing method of the present invention is a method of degassing liquid using any one of the degassing modules described in [1] to [6], wherein the gas port of the degassing module is suctioned and liquid is supplied to the liquid supply port of the degassing module. In this liquid degassing method, if the gas port is suctioned and liquid is supplied to the liquid supply port in any of the above-mentioned degassing modules, the liquid is degassed in multiple degassing elements, thus enabling a large flow rate of degassed liquid. Moreover, in this degassing module, the gas port is connected to the element connection portion and communicates with the intermediate communication space. Therefore, compared with the case where the gas port is only provided at any one end of the degassing module, the discharge path length of the gas passing through multiple hollow fiber membranes can be shortened, and the imbalance between the discharge force of the gas acting on the first side degassing element and the discharge force of the gas acting on the second side hollow fiber membrane element can be mitigated. As a result, the degassing efficiency can be improved.

[0020] [8] The liquid degassing method of the present invention is a method of degassing liquid using the degassing module described in [5], wherein a purge gas is supplied to at least one of the gas port, the first end gas port, and the second end gas port of the degassing module, and liquid is supplied to the liquid supply port of the degassing module. In this liquid degassing method, in any of the above-mentioned degassing modules, if a purge gas is supplied to at least one of the gas port, the first end gas port, and the second end gas port, and liquid is supplied to the liquid supply port, then the liquid is degassed in multiple degassing elements, thus enabling a large flow rate of degassed liquid. Moreover, in this degassing module, the gas port is connected to the element connection part and communicates with the intermediate communication space, the first end gas port is connected to the first end communication space forming part and communicates with the first end communication space, and the second end gas port is adjacent to and communicates with the second end communication space. Therefore, compared to the case where the gas port is only located at one end of the degassing module, the exhaust path length of the gas passing through multiple hollow fiber membranes can be shortened, and the imbalance between the exhaust force of the gas acting on the first degassing element and the exhaust force of the gas acting on the second hollow fiber membrane element can be mitigated. This improves degassing efficiency.

[0021] [9] In the liquid degassing method described in [8], purge gas can be supplied to the gas port of the degassing module. In this liquid degassing method, by supplying gas to the gas port of the degassing module, gas that has permeated through multiple hollow fiber membranes can be discharged from the first end gas port and the second end gas port.

[0022]

[10] In the liquid degassing method described in [9], the first gas port and the second gas port of the degassing module can be suctioned. In this liquid degassing method, by suctioning the first gas port and the second gas port of the degassing module, the discharge efficiency of the gas that has passed through multiple hollow fiber membranes can be improved.

[0023]

[11] In the liquid degassing method described in [8], purge gas can be supplied to the first gas port and the second gas port of the degassing module. In this liquid degassing method, by supplying purge gas to the first gas port and the second gas port of the module, gas that has permeated through multiple hollow fiber membranes can be discharged from the gas port.

[0024]

[12] In the liquid degassing method described in

[11] , the gas port of the degassing module can be suctioned. In this liquid degassing method, by suctioning the gas port of the degassing module, the discharge efficiency of the gas that has passed through multiple hollow fiber membranes can be improved.

[0025] The effects of the invention

[0026] According to the present invention, it is possible to achieve a large flow rate of degassed liquid and improve the gas discharge efficiency. Attached Figure Description

[0027] Figure 1 This is a schematic cross-sectional view of the degassing module involved in the implementation method.

[0028] Figure 2 yes Figure 1 A schematic cross-sectional view of the degassing module shown.

[0029] Figure 3 This is a schematic front view of the degassing element.

[0030] Figure 4 yes Figure 3 A schematic cross-sectional view along line IV-IV is shown.

[0031] Figure 5 It means Figure 3 A schematic cross-sectional view of a portion of the degassing element shown.

[0032] Figure 6 It means Figure 3 A schematic cross-sectional view of a portion of the degassing element shown.

[0033] Figure 7 It means Figure 1 A schematic cross-sectional view of a portion of the degassing module shown.

[0034] Figure 8 It means Figure 1 A schematic cross-sectional view of a portion of the degassing module shown.

[0035] Figure 9 It means Figure 1 A schematic cross-sectional view of a portion of the degassing module shown.

[0036] Figure 10 This is a schematic cross-sectional view of another example of a degassing module.

[0037] Figure 11 yes Figure 10 A schematic cross-sectional view of the degassing module shown.

[0038] Figure 12 This is a schematic cross-sectional view of another example of a degassing module.

[0039] Figure 13 This is a schematic cross-sectional view of a degassing module used to illustrate another example of a liquid degassing method.

[0040] Figure 14 This is a schematic cross-sectional view of a degassing module used to illustrate another example of a liquid degassing method. Detailed Implementation

[0041] Hereinafter, the degassing module and the liquid degassing method of the embodiment will be described with reference to the accompanying drawings. Furthermore, in all the drawings, the same or equivalent parts are labeled with the same symbols, and repeated descriptions are omitted.

[0042] [Degassing Module]

[0043] Figure 1 This is a schematic cross-sectional view of the degassing module involved in the implementation method. Figure 2 yes Figure 1 A schematic cross-sectional view of the degassing module is shown. Figure 1 and Figure 2 As shown, the degassing module 1 of this embodiment is used to degas liquid L. Liquid L is not particularly limited, and can be, for example, seawater, drinking water, pure water, ultrapure water, aqueous solutions containing ammonium sulfate, surfactants, etc., organic solvents such as alcohols and hydrocarbons, ionic liquids, etc. The degassing module 1 includes multiple degassing elements 2, a housing 3, element connecting portions 4, baffles 5, a first-end communicating space forming portion 6, and a partition portion 7. Furthermore, in Figure 1 In the middle, only the shell 3 is shown in cross-section.

[0044] Figure 3 This is a schematic front view of the degassing element. Figure 4 yes Figure 3 A schematic cross-sectional view along line IV-IV is shown. Figure 5 It means Figure 3 A schematic cross-sectional view of a portion of the degassing element shown. Figure 6 It means Figure 3 A schematic cross-sectional view of a portion of the degassing element shown. (See attached image.) Figures 1-6 As shown, the degassing element 2 is used to degas the liquid L. The degassing element 2 includes a liquid flow pipe 21, a plurality of hollow fiber membranes 22, a first fixing part 24, and a second fixing part 25.

[0045] The liquid flow tube 21 is a cylindrical component extending along the extension direction D. One of the two directions of the extension direction D is called the first extension direction D1, and the other is called the second extension direction D2. Figure 3 In the middle, the upper part is designated as the first extension direction D1, and the lower part is designated as the second extension direction D2. The end of the degassing element 2 on the side of the first extension direction D1 is referred to as the first element end 2a, and the end of the degassing element 2 on the side of the second extension direction D2 is referred to as the second element end 2b.

[0046] The hollow portion 21a of the liquid flow tube 21 is a flow path (inner flow path) for the flow of liquid L, and is formed by the inner circumferential surface of the liquid flow tube 21. The liquid flow tube 21 extends throughout the entire region in the extending direction D of the degassing element 2. That is, the liquid flow tube 21 extends from the end in the first extending direction D1 of the degassing element 2 to the end in the second extending direction D2 of the degassing element 2. The hollow portion 21a of the liquid flow tube 21 is open in both the first extending direction D1 and the second extending direction D2. The opening on the first extending direction D1 side of the hollow portion 21a of the liquid flow tube 21 is called the first end liquid flow tube opening 21b, and the opening on the second extending direction D2 side of the hollow portion 21a of the liquid flow tube 21 is called the second end liquid flow tube opening 21c. In addition, in the degassing element 2, no baffles or other components that prevent the liquid L from moving along the extending direction D are provided in the hollow portion 21a of the liquid flow tube 21.

[0047] Multiple openings 21d are formed on the liquid flow tube 21. These openings 21d are independent of the first end liquid flow tube opening 21b and the second end liquid flow tube opening 21c, and are used to allow liquid L to flow out from the hollow portion 21a to the outside of the liquid flow tube 21. That is, the multiple openings 21d are used to allow liquid L to flow out from the hollow portion 21a to the outside of the liquid flow tube 21 in the radial direction. The multiple openings 21d are formed on the peripheral wall of the liquid flow tube 21, opening the hollow portion 21a to the outside of the liquid flow tube 21.

[0048] Multiple hollow fiber membranes 22 extend along the liquid flow tube 21 and are arranged around the liquid flow tube 21 in a manner that covers multiple openings 21d. The multiple hollow fiber membranes 22 extending along the liquid flow tube 21 means that, in the initial state (unused state) of the degassing element 2, the multiple hollow fiber membranes 22 extend along the extension direction D. The multiple hollow fiber membranes 22 form a membrane bundle that is generally cylindrical as a whole.

[0049] Multiple hollow fiber membranes 22 are formed, for example, from a hollow fiber membrane fabric (not shown) woven into a curtain shape. The hollow fiber membrane fabric is a fabric woven from multiple hollow fiber membranes 22 forming the weft and warp threads (not shown). In the hollow fiber membrane fabric, the multiple hollow fiber membranes 22 are arranged in a curtain shape. Moreover, the hollow fiber membrane fabric is wound around the liquid flow tube 21 such that the multiple hollow fiber membranes 22 extend along the extension direction D and cover multiple openings 21d.

[0050] The hollow portion 22a of the hollow fiber membrane 22 is a flow path (intra-membrane flow path) for gas G to pass through, and it is formed by the inner peripheral surface of the hollow fiber membrane 22. Multiple hollow fiber membranes 22 extend throughout the entire region along the extension direction D of the degassing element 2. That is, multiple hollow fiber membranes 22 extend from the end of the degassing element 2 in the first extension direction D1 to the end of the degassing element 2 in the second extension direction D2. The hollow portions 22a of the multiple hollow fiber membranes 22 are open in both the first extension direction D1 and the second extension direction D2. Furthermore, the hollow portion 22a of the multiple hollow fiber membranes 22 refers to the hollow portion 22a of each of the multiple hollow fiber membranes 22. The opening on the first extension direction D1 side of the hollow portions 22a of the multiple hollow fiber membranes 22 is called the first end hollow fiber membrane opening 22b, and the opening on the second extension direction D2 side of the hollow portions 22a of the multiple hollow fiber membranes 22 is called the second end hollow fiber membrane opening 22c.

[0051] Hollow fiber membrane 22 is a hollow fiber membrane that allows gas G to pass through but not liquid L. The material, shape, and morphology of hollow fiber membrane 22 are not particularly limited. Examples of materials for hollow fiber membrane 22 include polyolefin resins such as polypropylene, polyethylene, and polymethylpentene; silicone resins such as polydimethylsiloxane and its copolymers; and fluorine resins such as PTFE and vinylidene fluoride. Examples of membrane shapes (sidewall shapes) for hollow fiber membrane 22 include porous membranes, microporous membranes, and homogeneous membranes without porosity (non-porous membranes). Examples of morphologies for hollow fiber membrane 22 include symmetrical membranes with a homogeneous overall chemical or physical structure (homogeneous membranes) and asymmetrical membranes (heterogeneous membranes) whose chemical or physical structure varies depending on the portion of the membrane. Asymmetrical membranes (heterogeneous membranes) are membranes with both a non-porous dense layer and porosity. In this case, the dense layer can be formed at any location within the membrane, such as on the surface or inside the porous membrane. Heterogeneous membranes also include composite membranes with different chemical structures and multilayer membranes such as 3-layer structures. In particular, heterogeneous membranes using poly(4-methylpentene-1) resin have a dense layer that blocks liquid L, and are therefore especially preferred.

[0052] The outer diameter of the hollow fiber membrane 22 is not particularly limited. From the viewpoint of increasing the membrane area, the outer diameter of the hollow fiber membrane 22 can be set to 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 the hollow fiber membrane 22 can be set to 50 μm or more, preferably 150 μm or more, and more preferably 200 μm or more.

[0053] The first fixing part 24 is located at the end 2a of the first element, sealing the liquid flow tube 21 and the plurality of hollow fiber membranes 22, and fixing the plurality of hollow fiber membranes 22 to the liquid flow tube 21 by leaving the hollow portions 22a of the plurality of hollow fiber membranes 22 open. That is, the first fixing part 24 fixes the ends of the plurality of hollow fiber membranes 22 on the first extension direction D1 side to the liquid flow tube 21. Furthermore, the first fixing part 24 seals the liquid flow tube 21 and the plurality of hollow fiber membranes 22. However, the first fixing part 24 is not provided in the hollow portions 21a of the liquid flow tube 21 or the hollow portions 22a of the plurality of hollow fiber membranes 22, thereby leaving the hollow portions 21a of the liquid flow tube 21 and the hollow portions 22a of the plurality of hollow fiber membranes 22 open. The first fixing part 24 is, for example, formed of resin.

[0054] The second fixing part 25 is located at the end 2b of the second element, sealing the liquid flow tube 21 and the plurality of hollow fiber membranes 22, and fixing the plurality of hollow fiber membranes 22 to the liquid flow tube 21 by leaving the hollow portions 22a of the plurality of hollow fiber membranes 22 open. That is, the second fixing part 25 fixes the ends of the plurality of hollow fiber membranes 22 on the second extension direction D2 side to the liquid flow tube 21. Furthermore, the second fixing part 25 seals the liquid flow tube 21 and the plurality of hollow fiber membranes 22. However, the second fixing part 25 is not provided in the hollow portions 21a of the liquid flow tube 21 or the hollow portions 22a of the plurality of hollow fiber membranes 22, thereby leaving the hollow portions 21a of the liquid flow tube 21 and the hollow portions 22a of the plurality of hollow fiber membranes 22 open. The second fixing part 25 is, for example, formed of resin.

[0055] In addition, multiple hollow fiber membranes 22 are not covered by components such as the housing, but are exposed on the outside of the degassing element 2 between the first fixing part 24 and the second fixing part 25.

[0056] The housing 3 houses a plurality of degassing elements 2 arranged in the extending direction D. In this embodiment, two degassing elements 2 are housed in the housing 3. The two degassing elements 2 are composed of a first degassing element 2α and a second degassing element 2β. The first degassing element 2α and the second degassing element 2β are adjacent degassing elements 2 in the extending direction D. The first degassing element 2α is a first-side degassing element disposed on the first extending direction D1 side, and the second degassing element 2β is a second-side degassing element disposed on the second extending direction D2 side. Furthermore, the first degassing element 2α is also the first end degassing element located at the end in the first extending direction D1 among the plurality of degassing elements 2, and the second degassing element 2β is also the second end degassing element located at the end in the second extending direction D2 among the plurality of degassing elements 2.

[0057] Figure 7 It means Figure 1 A schematic cross-sectional view of a portion of the degassing module shown. Figure 8 It means Figure 1 A schematic cross-sectional view of a portion of the degassing module shown. Figure 9 It means Figure 1 A schematic cross-sectional view of a portion of the degassing module shown. Figure 1 , Figure 2 and Figures 7-9 As shown, the housing 3 accommodates the first degassing element 2α and the second degassing element 2β in such a way that a space is formed between them. This space allows liquid L to flow between the first degassing element 2α, the second degassing element 2β, and the housing 3.

[0058] The housing 3 includes a cylindrical portion 31 that accommodates a first degassing element 2α and a second degassing element 2β, a first cover portion 32 connected to one end of the cylindrical portion 31, and a second cover portion 33 connected to the end of the cylindrical portion 31 opposite to the first cover portion 32. The first degassing element 2α and the second degassing element 2β are accommodated in the cylindrical portion 31 such that their extending directions D become the extending directions of the cylindrical portion 31, i.e., the opposing directions of the first cover portion 32 and the second cover portion 33. Thus, the extending directions D of the first degassing element 2α and the second degassing element 2β are the same as the extending direction of the cylindrical portion 31, and therefore the extending direction of the cylindrical portion 31 is also called the extending direction D. The first cover portion 32 is connected to the end of the cylindrical portion 31 on the first extending direction D1 side in a manner that covers the opening on the first extending direction D1 side. The second cover 33 is connected to the end of the cylindrical portion 31 on the second extension direction D2 side in such a way that it covers the opening on the second extension direction D2 side of the cylindrical portion 31.

[0059] The component connecting part 4 connects the first degassing element 2α and the second degassing element 2β. Furthermore, the component connecting part 4 causes the first degassing element 2α and the second degassing element 2β to be separately arranged in the extending direction D.

[0060] The component connection portion 4 forms an intermediate connecting space S1 and an intermediate liquid flow path S2. The intermediate connecting space S1 is a space communicating with the hollow portions 22a of the plurality of hollow fiber membranes 22 of the first degassing element 2α and the hollow portions 22a of the plurality of hollow fiber membranes 22 of the second degassing element 2β. Furthermore, the intermediate connecting space S1 is adjacent to the second-end hollow fiber membrane opening 22c of the first degassing element 2α and the first-end hollow fiber membrane opening 22b of the second degassing element 2β. The intermediate liquid flow path S2 is a liquid flow path communicating with the hollow portions 21a of the liquid flow pipe 21 of the first degassing element 2α and the hollow portions 21a of the liquid flow pipe 21 of the second degassing element 2β. Furthermore, the intermediate liquid flow path S2 is adjacent to the second-end liquid flow pipe opening 21c of the first degassing element 2α and the first-end liquid flow pipe opening 21b of the second degassing element 2β.

[0061] The component connection part 4 has a connecting cover 41 and a connecting tube 42.

[0062] The connecting cover 41 is a cover that connects to the second fixing part 25 of the first degassing element 2α and the first fixing part 24 of the second degassing element 2β, and covers the space between the first degassing element 2α and the second degassing element 2β. The connecting cover 41 is connected to the second fixing part 25 of the first degassing element 2α by being embedded in the connecting cover 41. Furthermore, the connecting cover 41 is connected to the first fixing part 24 of the second degassing element 2β by being embedded in the connecting cover 41.

[0063] The connecting pipe 42 is a pipe that connects to the liquid flow pipe 21 of the first degassing element 2α and the liquid flow pipe 21 of the second degassing element 2β. The connecting pipe 42 is connected to the liquid flow pipe 21 of the first degassing element 2α by inserting its end in the first extension direction D1 side into its end 21e in the second extension direction D2 side. Furthermore, the connecting pipe 42 is connected to the liquid flow pipe 21 of the second degassing element 2β by inserting its end in the second extension direction D2 side into its end 21f in the first extension direction D1 side.

[0064] Furthermore, the connecting pipe 42 forms an intermediate liquid flow path S2, thereby connecting the hollow portion 21a of the liquid flow pipe 21 of the first degassing element 2α with the hollow portion 21a of the liquid flow pipe 21 of the second degassing element 2β. Additionally, the connecting cover 41 and the connecting pipe 42 form an intermediate connecting space S1, thereby connecting the hollow portions 22a of the plurality of hollow fiber membranes 22 of the first degassing element 2α with the hollow portions 22a of the plurality of hollow fiber membranes 22 of the second degassing element 2β.

[0065] Baffle 5 closes the end 21f of the hollow portion 21a of the liquid flow pipe 21 of the first degassing element 2α on the first extending direction D1 side. That is, baffle 5 closes the hollow portion 21a of the liquid flow pipe 21 of the first degassing element 2α on the first extending direction D1 side. Baffle 5 is embedded in the end 21f of the hollow portion 21a of the liquid flow pipe 21 of the first degassing element 2α on the first extending direction D1 side. Baffle 5 prevents the liquid L supplied to the hollow portion 21a of the liquid flow pipe 21 of the first degassing element 2α and the second degassing element 2β from being discharged from the first degassing element 2α along the first extending direction D1. Baffle 5 is only installed on the first degassing element 2α and does not close the hollow portion 22a of the liquid flow pipe 21 of the second degassing element 2β. Therefore, the liquid L is not discharged from the first degassing element 2α along the first extending direction D1, but is discharged from the first degassing element 2α and the second degassing element 2β through a plurality of openings 21d formed in the liquid flow pipe 21 to the radial outside of the liquid flow pipe 21.

[0066] In addition, apart from the baffle 5, no components are provided on the hollow portion 21a and the intermediate liquid flow path S2 of the liquid flow pipe 21 of the first degassing element 2α and the second degassing element 2β to prevent the liquid L from moving along the extension direction D.

[0067] The first end-connecting space forming portion 6 is connected to the end portion 2a of the first degassing element 2α on the first extension direction D1 side, i.e., the first element end 2a, to form a first end-connecting space S3. The first end-connecting space S3 is a space communicating with the hollow portions 22a of the plurality of hollow fiber membranes 22 of the first degassing element 2α. The first end-connecting space S3 is adjacent to the first extension direction D1 side of the first degassing element 2α. Furthermore, the first end-connecting space S3 is adjacent to the first end hollow fiber membrane openings 22b of the plurality of hollow fiber membranes 22 of the first degassing element 2α. The first end-connecting space forming portion 6 is connected to the first fixing portion 24 of the first degassing element 2α in a manner that covers the first element end 2a of the first degassing element 2α. Moreover, the first end-connecting space forming portion 6 forms the first end-connecting space S3 between itself and the first element end 2a of the first degassing element 2α.

[0068] The partition 7 divides the area within the housing 3 into an inner region R1 and an outer region R2, with multiple hollow fiber membranes 22 as boundaries. The inner region R1 is the region including the hollow portion 22a of the multiple hollow fiber membranes 22. The outer region R2 is the region including the hollow portion 21a of the liquid flow tube 21. Therefore, the membrane of the hollow fiber membrane 22 forms the boundary between the inner region R1 and the outer region R2. That is, the inner side (hollow portion 22a) of the hollow fiber membrane 22 becomes the inner region R1, and the outer side of the hollow fiber membrane 22 becomes the outer region R2. Furthermore, the multiple hollow fiber membranes 22 prevent liquid L from permeating from the outer region R2 to the inner region R1, while allowing gas G (dissolved gas of liquid L, bubbles contained in liquid L, etc.) to permeate from the outer region R2 to the inner region R1. Furthermore, since the hollow portion 21a of the liquid flow tube 21 is connected to the outside of the liquid flow tube 21 through a plurality of openings 21d formed in the liquid flow tube 21, the outer region R2 also includes a space S4 on the outside of the liquid flow tube 21 that is connected to the hollow portion 21a of the liquid flow tube 21.

[0069] The partition 7 seals the second fixing part 25 of the second degassing element 2β with the housing 3. Therefore, a second end-connecting space S5 is formed on the second extending direction D2 side of the second degassing element 2β, communicating with the hollow portions 22a of the plurality of hollow fiber membranes 22 of the second degassing element 2β. The second end-connecting space S5 is adjacent to the second extending direction D2 side of the second element end 2b of the second degassing element 2β. Furthermore, the second end-connecting space S5 is adjacent to the second end hollow fiber membrane opening 22c of the second degassing element 2β. Moreover, since the second end-connecting space S5 communicates with the hollow portions 22a of the plurality of hollow fiber membranes 22, it is also part of the internal region R1.

[0070] Furthermore, the partition 7 secures the second fixing portion 25 of the second degassing element 2β to the housing 3 by sealing the second fixing portion 25 of the second degassing element 2β with the housing 3. The partition 7 is, for example, formed of resin.

[0071] The housing 3 has: a liquid supply port 34 for supplying liquid L to the hollow portion 21a of the liquid flow tube 21; a liquid discharge port 35 for discharging liquid L flowing out of the liquid flow tube 21; and a gas port 36, a first-end gas port 37, and a second-end gas port 38 for discharging gas that has permeated through the plurality of hollow fiber membranes 22. Furthermore, when degassing liquid L in vacuum mode, the gas port 36, the first-end gas port 37, and the second-end gas port 38 are also referred to as vacuum ports, etc. The liquid supply port 34, the liquid discharge port 35, the gas port 36, the first-end gas port 37, and the second-end gas port 38 can be integral with the housing 3, or they can be separate components from the housing 3.

[0072] The liquid supply port 34 is a port provided on the second cover 33 that connects the inside and outside of the housing 3. The liquid supply port 34 extends in a tubular shape from the second cover 33 toward the inside of the housing 3 and is connected to the end 21e on the second extension direction D2 side of the liquid flow pipe 21 of the second degassing element 2β. Moreover, the liquid supply port 34 communicates with the hollow portion 21a of the liquid flow pipe 21 of the second degassing element 2β.

[0073] The liquid discharge port 35 is a port provided on the first cover 32 that connects the inside and outside of the housing 3. The liquid discharge port 35 is adjacent to and communicates with the space S4 on the outside of the liquid flow pipe 21.

[0074] The gas port 36 is a port provided on the cylindrical portion 31 that connects the inside and outside of the housing 3. The gas port 36 extends from the cylindrical portion 31 into a tubular shape towards the inside of the housing 3 and is connected to the connecting cover 41 of the component connecting portion 4. Furthermore, the gas port 36 communicates with the intermediate communicating space S1.

[0075] The first gas port 37 is a port provided on the first cover portion 32 that connects the inside and outside of the housing 3. The first gas port 37 extends from the first cover portion 32 into the inside of the housing 3 in a tubular shape and is connected to the first end communication space forming portion 6. Furthermore, the first gas port 37 communicates with the first end communication space S3.

[0076] The second gas port 38 is a port located on the second cover 33 that connects the inside and outside of the housing 3. The second gas port 38 is adjacent to and communicates with the second end communication space S5.

[0077] [Methods for degassing liquids]

[0078] Next, the degassing method for liquid L using degassing module 1 will be described. Here, as an example of the degassing method for liquid L, the method of degassing liquid L by vacuum mode will be described.

[0079] In this degassing method, gas ports 36, 37, and 38 of the degassing module 1 are suctioned, and liquid L is supplied to the liquid supply port 34 of the degassing module 1. Suctioning of gas ports 36, 37, and 38 can be performed, for example, by connecting a suction device (not shown) such as a vacuum pump to gas ports 36, 37, and 38 via piping, and activating the suction device. Supplying liquid L to the liquid supply port 34 can be performed, for example, by connecting a liquid supply device (not shown) such as a liquid pump that delivers liquid L to the liquid supply port 34 via piping, and activating the liquid supply device.

[0080] If gas port 36, first gas port 37, and second gas port 38 are evacuated, the internal region R1 connected to these ports is evacuated, thus reducing the pressure in the internal region R1. Furthermore, if liquid L is supplied to liquid supply port 34, liquid L is supplied to the external region R2 connected to liquid supply port 34. The liquid L supplied to liquid supply port 34 is supplied to the hollow portion 21a of the liquid flow tubes 21 of the first degassing element 2α and the second degassing element 2β. Then, in the first degassing element 2α and the second degassing element 2β, the liquid L supplied to the hollow portion 21a of each liquid flow tube 21 is discharged from the multiple openings 21d of the liquid flow tube 21 to the space S4 outside the liquid flow tube 21, and contacts the multiple hollow fiber membranes 22. At this time, in the first degassing element 2α and the second degassing element 2β, since the hollow portions 22a of the multiple hollow fiber membranes 22 are in a depressurized state, the dissolved gas in the liquid L, the gas G such as bubbles contained in the liquid L, will pass through the multiple hollow fiber membranes 22. As a result, the liquid L is degassed. The degassed liquid L is discharged from the liquid discharge port 35 through the space between the degassing element 2 and the housing 3. The gas G that has passed through the multiple hollow fiber membranes 22 of the first degassing element 2α and the second degassing element 2β is discharged from the gas port 36, the first end gas port 37, and the second end gas port 38 through the hollow portions 22a of the multiple hollow fiber membranes 22 of the first degassing element 2α and the second degassing element 2β, the intermediate connecting space S1, the first end connecting space S3, and the second end connecting space S5. More specifically, the gas G that has passed through the plurality of hollow fiber membranes 22 of the first degassing element 2α is discharged from the gas port 36 and the first end gas port 37 through the hollow portion 22a, the intermediate connecting space S1, and the first end connecting space S3 of the plurality of hollow fiber membranes 22 of the first degassing element 2α. The gas G that has passed through the plurality of hollow fiber membranes 22 of the second degassing element 2β is discharged from the gas port 36 and the second end gas port 38 through the hollow portion 22a, the intermediate connecting space S1, and the second end connecting space S5 of the plurality of hollow fiber membranes 22 of the second degassing element 2β.

[0081] As explained above, in the degassing module 1 of this embodiment, the first degassing element 2α and the second degassing element 2β are housed in the housing 3 in such a manner that the first degassing element 2α and the second degassing element 2β are arranged in the extending direction D. The element connection portion 4 connected to the first degassing element 2α and the second degassing element 2β forms an intermediate communication space S1 and an intermediate liquid flow path S2. The intermediate communication space S1 communicates with the hollow portions 22a of the plurality of hollow fiber membranes 22 of the first degassing element 2α and the hollow portions 22a of the plurality of hollow fiber membranes 22 of the second degassing element 2β. The intermediate liquid flow path S2 communicates with the liquid flow path of the first degassing element 2α. The hollow portion 21a of the liquid flow tube 21 and the hollow portion 21a of the liquid flow tube 21 of the second degassing element 2β are connected. The partition 7 divides the area inside the housing 3 into an inner region R1 including the hollow portion 22a of the multiple hollow fiber membranes 22 and an outer region R2 including the hollow portion 21a of the liquid flow tube 21, with the multiple hollow fiber membranes 22 as boundaries. The housing 3 has: a liquid supply port 34 for supplying liquid L to the hollow portion 21a of the liquid flow tube 21; a liquid discharge port 35 for discharging the liquid L flowing out from the liquid flow tube 21; and a gas port 36 for discharging the gas that has permeated through the multiple hollow fiber membranes 22. Therefore, liquid L can be degassed in the first degassing element 2α and the second degassing element 2β, thus achieving a large flow rate of degassed liquid L. Moreover, in this degassing module 1, the gas port 36 is connected to the element connection portion 4 and communicates with the intermediate communication space S1. Therefore, compared to the case where the gas port 36 is only located at any one end of the multiple degassing elements, the discharge path length of the gas G passing through the multiple hollow fiber membranes 22 can be shortened, and the imbalance between the discharge force of the gas G acting on the first degassing element 2α and the discharge force of the gas G acting on the second degassing element 2β can be mitigated. As a result, the degassing efficiency can be improved.

[0082] Furthermore, in this degassing module 1, the end 21f of the hollow portion 21a of the liquid flow tube 21 of the first degassing element 2α on the first extending direction D1 side is closed, and the liquid supply port 34 is connected to the end 21e of the liquid flow tube 21 of the second degassing element 2β on the second extending direction D2 side. Therefore, if liquid L is supplied to the liquid supply port 34, the liquid L is supplied to the hollow portion 21a of the liquid flow tube 21 in the first degassing element 2α and the second degassing element 2β, flows out from the outside of the liquid flow tube 21 through multiple openings 21d, and is degassed by contacting multiple hollow fiber membranes 22. Then, the liquid L that has been degassed by contacting multiple hollow fiber membranes 22 does not return to the hollow portion 21a of the liquid flow tube 21, but is discharged from the liquid discharge port 35. That is, the liquid L does not flow in the direction that presses the multiple hollow fiber membranes 22 against the liquid flow tube 21, but flows in the direction that moves the multiple hollow fiber membranes 22 away from the liquid flow tube 21. Therefore, the increase in pressure loss of liquid L as it passes through multiple hollow fiber membranes 22 can be suppressed, thus suppressing the decrease in the flow rate of liquid L. As a result, for example, a liquid supply device with relatively low output can be used as the liquid supply device for supplying liquid L to the degassing module 1.

[0083] Furthermore, in this degassing module 1, a first end-connecting space forming portion 6, connected to the end of the first degassing element 2α on the first extension direction D1 side (i.e., the first element end 2a), forms a first end-connecting space S3 that communicates with the hollow portions 22a of the plurality of hollow fiber membranes 22 of the first degassing element 2α. The housing 3 has a first end gas port 37 connected to the first end-connecting space forming portion 6 and communicating with the first end-connecting space S3. Therefore, it is possible to draw gas from the hollow portions 22a of the plurality of hollow fiber membranes 22 on the first extension direction D1 side of the first degassing element 2α, or to supply purge gas to the hollow portions 22a of the plurality of hollow fiber membranes 22. This further improves the degassing efficiency.

[0084] Furthermore, in this degassing module 1, a second end communication space S5 is formed on the second extension direction D2 side of the second degassing element 2β, communicating with the hollow portions 22a of the plurality of hollow fiber membranes 22 of the second degassing element 2β. The housing 3 has a second end gas port 38 adjacent to and communicating with the second end communication space S5. Therefore, it is possible to draw suction from the hollow portions 22a of the plurality of hollow fiber membranes 22 from the end on the second extension direction D2 side of the second degassing element 2β, or to supply purge gas to the hollow portions 22a of the plurality of hollow fiber membranes 22. As a result, the degassing efficiency can be further improved.

[0085] Furthermore, in this degassing module 1, the component connection part 4 includes: a connecting cover 41, which is connected to the second fixing part 25 of the first degassing element 2α and the first fixing part 24 of the second degassing element 2β, and covers the space between the first degassing element 2α and the second degassing element 2β; and a connecting pipe 42, which is connected to the liquid flow pipe 21 of the first degassing element 2α and the liquid flow pipe 21 of the second degassing element 2β. Therefore, the connecting pipe 42 forms an intermediate liquid flow path S2, and the connecting cover 41 and the connecting pipe 42 form an intermediate connecting space S1. Moreover, since the gas port 36 is connected to the connecting cover 41, the gas port 36 can be connected to the intermediate connecting space S1 with a simple structure.

[0086] Furthermore, in this degassing module 1, apart from the baffle 5, no components are provided in the hollow portion 21a of the liquid flow pipe 21 of the first degassing element 2α and the second degassing element 2β, or in the intermediate liquid flow path S2, to prevent the liquid L from moving along the extension direction D. Therefore, the liquid L flowing out of the liquid flow pipe 21 of the first degassing element 2α and the second degassing element 2β does not return to the first degassing element 2α and the second degassing element 2β, but is discharged from the liquid discharge port 35.

[0087] Here, consider a degassing module of the following comparative example: It is equipped with components such as baffles that close either the hollow portion or the intermediate connecting space of the liquid flow pipes of the first and second degassing elements, causing the liquid supplied to the liquid flow pipes to flow out and return to the liquid flow pipes. In this comparative example of the degassing module, when the liquid flowing out of the liquid flow pipes returns to the liquid flow pipes, it presses multiple hollow fiber membranes against the liquid flow pipes, thus narrowing the liquid flow path and increasing the liquid pressure loss. The higher the flow rate, the more pronounced this increase in liquid pressure loss becomes. Consequently, the liquid flow rate decreases, therefore, a high-output liquid supply device (not shown) is required as the liquid supply device that delivers liquid to the degassing module.

[0088] In contrast, in this degassing module 1, apart from the baffle 5 at the end 21f on the first extending direction D1 side of the hollow portion 21a of the liquid flow pipe 21 of the first degassing element 2α, no components are provided in the hollow portion 21a of the liquid flow pipe 21 of the first degassing element 2α and the second degassing element 2β, or in the intermediate liquid flow path S2, to prevent the liquid L from moving along the extending direction D. Therefore, the liquid L flowing out of the liquid flow pipe 21 does not return to the liquid flow pipe 21, but is discharged from the liquid discharge port 35. Therefore, compared with the degassing module of the comparative example, the pressure loss of the liquid is reduced while the flow rate of the liquid is increased, and as a liquid supply device, a relatively low output liquid supply device can be used.

[0089] In the liquid degassing method of this embodiment, in the degassing module 1, if gas port 36, first end gas port 37, and second end gas port 38 are suctioned and liquid L is supplied to liquid supply port 34, the liquid L is supplied through the first degassing element 2α and the second degassing element 2β to the hollow portion 21a of the liquid flow tube 21, flows out from the outside of the liquid flow tube 21 through multiple openings 21d, and comes into contact with multiple hollow fiber membranes 22 to be degassed. Furthermore, in this degassing module 1, gas port 36 is connected to the element connection portion 4 and communicates with the intermediate communication space S1. Therefore, compared to the case where the gas port is only provided at any one end of the multiple degassing modules, the discharge path length of gas G passing through the multiple hollow fiber membranes 22 can be shortened, and the imbalance between the discharge force of gas G acting on the first degassing element 2α and the discharge force of gas G acting on the second degassing element 2β can be mitigated. This improves the degassing efficiency.

[0090] In addition, by degassing seawater (which is liquid L), the concentration of carbon dioxide in the seawater can be reduced, thereby reducing the concentration of carbon dioxide in the atmosphere.

[0091] The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above embodiments.

[0092] For example, in the above embodiment, three gas ports were described as being provided as gas ports for evacuating the internal region R1: a gas port 36 connected to the component connection portion and communicating with the intermediate communication space; a first-end gas port 37 connected to the first-end communication space forming portion and communicating with the first-end communication space; and a second-end gas port 38 adjacent to and communicating with the second-end communication space. However, as long as at least the gas port connected to the component connection portion and communicating with the intermediate communication space is provided, other gas ports may not be provided. In addition, besides the gas port connected to the component connection portion and communicating with the intermediate communication space, only one of the first-end gas port connected to the first-end communication space forming portion and communicating with the first-end communication space or the second-end gas port adjacent to and communicating with the second-end communication space may be provided.

[0093] Figure 10 This is a schematic cross-sectional view of another example of a degassing module. Figure 11 yes Figure 10 A schematic cross-sectional view of the degassing module shown. Figure 10 and Figure 11The degassing module 1A shown only has a gas port 36 connected to the component connection part 4 and communicating with the intermediate communicating space S1 as a gas port for absorbing the internal region R1. Furthermore, the first cover part 32A of the housing 3A corresponding to the first cover part 32 of the housing 3 does not have a first end gas port connected to the first end communicating space forming part and communicating with the first end communicating space. Also, the second cover part 33A of the housing 3A corresponding to the second cover part 33 of the housing 3 does not have a second end gas port adjacent to and communicating with the second end communicating space. Additionally, in Figure 10 In the diagram, only the shell 3A is shown in cross-section. Therefore, the first end-connecting space forming portion 6A, corresponding to the first end-connecting space forming portion 6, communicates only with the hollow portions 22a of the plurality of hollow fiber membranes 22 of the first degassing element 2α. Furthermore, the second end-connecting space S5 communicates only with the hollow portions 22a of the plurality of hollow fiber membranes 22. Alternatively, the first end-connecting space forming portion 6A may not form the first end-connecting space S3, and may instead close the ends of the hollow portions 22a of the plurality of hollow fiber membranes 22 of the first degassing element 2α on the first extending direction D1 side. Furthermore, the ends of the hollow portions 22a of the plurality of hollow fiber membranes 22 of the second degassing element 2β on the second extending direction D2 side may be closed, and the second end-connecting space S5 may not be formed.

[0094] Thus, in the degassing module 1A, the gas port 36 is also connected to the element connection part 4 and communicates with the intermediate communication space S1. Therefore, compared to the case where the gas port 36 is only provided at any one end of the multiple degassing elements, the discharge path length of the gas G that has passed through the multiple hollow fiber membranes 22 can be shortened, and the imbalance between the discharge force of the gas G acting on the first degassing element 2α and the discharge force of the gas G acting on the second degassing element 2β can be mitigated. As a result, the degassing efficiency can be improved.

[0095] Furthermore, in the above embodiment, the degassing module is described as having two degassing elements, but the degassing module may also have three or more degassing elements.

[0096] Figure 12 This is a schematic cross-sectional view of another example of a degassing module. Figure 12 In the degassing module 1B shown, four degassing elements 2 are housed in the housing 3B corresponding to the housing 3. The four degassing elements 2 consist of a first degassing element 2α, a second degassing element 2β, a third degassing element 2γ, and a fourth degassing element 2δ. The third degassing element 2γ is adjacent to the first degassing element 2α on the first extending direction D1 side. The fourth degassing element 2δ is adjacent to the second degassing element 2β on the second extending direction D2 side. The first degassing element 2α, the second degassing element 2β, the third degassing element 2γ, and the fourth degassing element 2δ are housed in the cylindrical portion 31B corresponding to the cylindrical portion 31.

[0097] The third degassing element 2γ and the first degassing element 2α are adjacent degassing elements 2 in the extension direction D. Moreover, in the relationship between the third degassing element 2γ and the first degassing element 2α, the third degassing element 2γ is a first side degassing element disposed on the first extension direction D1 side of the first degassing element 2α, and the first degassing element 2α is a second side degassing element disposed on the second extension direction D2 side of the third degassing element 2γ.

[0098] Furthermore, the first degassing element 2α and the second degassing element 2β are adjacent degassing elements 2 in the extension direction D. Moreover, in the relationship between the first degassing element 2α and the second degassing element 2β, the first degassing element 2α is a first-side degassing element disposed on the first extension direction D1 side of the second degassing element 2β, and the second degassing element 2β is a second-side degassing element disposed on the second extension direction D2 side of the first degassing element 2α.

[0099] Furthermore, the second degassing element 2β and the fourth degassing element 2δ are adjacent degassing elements 2 in the extension direction D. Moreover, in the relationship between the second degassing element 2β and the fourth degassing element 2δ, the second degassing element 2β is a first-side degassing element disposed on the first extension direction D1 side of the fourth degassing element 2δ, and the fourth degassing element 2δ is a second-side degassing element disposed on the second extension direction D2 side of the second degassing element 2β.

[0100] Furthermore, the third degassing element 2γ is also the first end degassing element located at the end of the first extension direction D1 among the multiple degassing elements 2, and the fourth degassing element 2δ is also the second end degassing element located at the end of the second extension direction D2 among the multiple degassing elements 2.

[0101] Furthermore, the third degassing element 2γ is connected to the first degassing element 2α via element connection part 4, the first degassing element 2α is connected to the second degassing element 2β via element connection part 4, and the second degassing element 2β is connected to the fourth degassing element 2δ via element connection part 4. The element connection part 4 connecting the first degassing element 2α and the second degassing element 2β is called the first element connection part 4α. The element connection part 4 connecting the third degassing element 2γ and the first degassing element 2α is called the second element connection part 4β. The element connection part 4 connecting the second degassing element 2β and the fourth degassing element 2δ is called the third element connection part 4γ. The first element connection part 4α, the second element connection part 4β, and the third element connection part 4γ respectively form the intermediate connecting space S1 and the intermediate liquid flow path S2.

[0102] Baffle 5 (reference) Figure 2The baffle 5 is installed only on the third degassing element 2γ and does not close the hollow portion 22a of the liquid flow pipe 21 of the first degassing element 2α, the second degassing element 2β, and the fourth degassing element 2δ. Furthermore, in the hollow portion 21a of the liquid flow pipe 21 of the first degassing element 2α, the second degassing element 2β, the third degassing element 2γ, and the fourth degassing element 2δ, and in each intermediate liquid flow path S2, no components other than the baffle 5 are provided to prevent the liquid L from moving along the extension direction D.

[0103] The first end-connecting space forming portion 6 is connected to the end portion 2a of the third degassing element 2γ on the first extension direction D1 side, i.e., the first element end 2a. Furthermore, the first end-connecting space forming portion 6 forms a space S3 that is adjacent to the first extension direction D1 side of the third degassing element 2γ, adjacent to the first end hollow fiber membrane openings 22b of the plurality of hollow fiber membranes 22 of the third degassing element 2γ, and communicating with the hollow portions 22a of the plurality of hollow fiber membranes 22 of the third degassing element 2γ. The first end-connecting space forming portion 6 is connected to the first fixing portion 24 of the third degassing element 2γ in a manner that covers the first element end 2a of the third degassing element 2γ. Moreover, the first end-connecting space forming portion 6 forms the first end-connecting space S3 between itself and the first element end 2a of the third degassing element 2γ.

[0104] The partition 7 divides the area within the housing 3B into an inner region R1 and an outer region R2 by sealing the second fixing part 25 of the fourth degassing element 2δ with the housing 3B. Therefore, a space is formed on the second extension direction D2 side of the fourth degassing element 2δ that is adjacent to the second extension direction D2 side of the second element end 2b of the fourth degassing element 2δ, adjacent to the second end hollow fiber membrane opening 22c of the fourth degassing element 2δ, and communicating with the hollow portions 22a of the plurality of hollow fiber membranes 22 of the fourth degassing element 2δ as the second end communication space S5.

[0105] The housing 3B has a liquid supply port 34, a liquid discharge port 35, three gas ports 36, a first gas port 37, and a second gas port 38. The three gas ports 36 are composed of a first gas port 36α, a second gas port 36β, and a third gas port 36γ.

[0106] The liquid supply port 34 extends into a tube shape from the second cover 33 toward the inside of the housing 3 and is connected to the end 21e on the second extension direction D2 side of the liquid flow tube 21 of the fourth degassing element 2δ. Moreover, the liquid supply port 34 communicates with the hollow portion 21a of the liquid flow tube 21 of the fourth degassing element 2δ.

[0107] The liquid discharge port 35 is adjacent to and connected to the space S4 on the outside of the liquid flow pipe 21.

[0108] The first gas port 36α extends into a tubular shape from the cylindrical portion 31B toward the inner side of the housing 3B and connects to the first element connection portion 4α. Furthermore, the first gas port 36α communicates with the intermediate communication space S1 formed by the first element connection portion 4α.

[0109] The second gas port 36β extends in a tubular shape from the cylindrical portion 31B toward the inner side of the housing 3B and is connected to the second element connection portion 4β. Furthermore, the second gas port 36β communicates with the intermediate communication space S1 formed by the second element connection portion 4β.

[0110] The third gas port 36γ extends into a tubular shape from the cylindrical portion 31B toward the inner side of the housing 3B and is connected to the third element connection portion 4γ. Furthermore, the third gas port 36γ communicates with the intermediate communication space S1 formed by the third element connection portion 4γ.

[0111] The first end gas port 37 extends into a tube shape from the first cover portion 32 toward the inside of the housing 3 and connects to the first end communication space forming portion 6. Moreover, the first end gas port 37 communicates with the first end communication space S3.

[0112] The second gas port 38 is adjacent to and connected to the second connecting space S5.

[0113] When degassing liquid L using degassing module 1B in vacuum mode, the first gas port 36α, second gas port 36β, third gas port 36γ, first end gas port 37, and second end gas port 38 of degassing module 1B are drawn in, and liquid L is supplied to liquid supply port 34 of degassing module 1B. Thus, the liquid L supplied to liquid supply port 34 is degassed in the first degassing element 2α, second degassing element 2β, third degassing element 2γ, and fourth degassing element 2δ, and discharged from liquid discharge port 35. Gas G that has permeated through multiple hollow fiber membranes 22 in the first degassing element 2α, the second degassing element 2β, the third degassing element 2γ, and the fourth degassing element 2δ is discharged from the first gas port 36α, the second gas port 36β, the third gas port 36γ, the first end gas port 37, and the second end gas port 38 through the hollow portions 22a, intermediate connecting spaces S1, first end connecting spaces S3, and second end connecting spaces S5 of the multiple hollow fiber membranes 22 in the first degassing element 2α, the second degassing element 2β, the third degassing element 2γ, and the fourth degassing element 2δ. More specifically, gas G that has permeated through the multiple hollow fiber membranes 22 in the third degassing element 2γ is discharged from the first end gas port 37 and the second gas port 36β. Gas G that has permeated through the multiple hollow fiber membranes 22 in the first degassing element 2α is discharged from the second gas port 36β and the first gas port 36α. Gas G passing through the multiple hollow fiber membranes 22 of the second degassing element 2β is discharged from the first gas port 36α and the third gas port 36γ. Gas G passing through the multiple hollow fiber membranes 22 of the fourth degassing element 2δ is discharged from the third gas port 36γ and the second end gas port 38.

[0114] Thus, in the degassing module 1B, each gas port 36 is also connected to each element connection portion 4 and communicates with the intermediate communication space S1. Therefore, compared to the case where the gas port 36 is only provided at any one end of the multiple degassing elements, the discharge path length of the gas G passing through the multiple hollow fiber membranes 22 can be shortened, and the imbalance of the discharge force of the gas G acting on the first degassing element 2α, the second degassing element 2β, the third degassing element 2γ, and the fourth degassing element 2δ can be mitigated. As a result, the degassing efficiency can be improved.

[0115] Furthermore, in the above embodiment, it was described that liquid L was degassed by vacuum mode, but liquid L can also be degassed by purge mode, or by a combination of purge mode and vacuum mode.

[0116] Figure 13 and Figure 14 This is a schematic cross-sectional view of a degassing module used to illustrate another example of a liquid degassing method. (e.g.) Figure 13 and Figure 14As illustrated, when degassing liquid L using the degassing module 1 of the above embodiment and in vacuum mode, purge gas SG is supplied to at least one of the gas port 36, the first end gas port 37, and the second end gas port 38 of the degassing module 1, and liquid L is supplied to the liquid supply port 34 of the degassing module 1. As the purge gas SG, inactive gases such as air (dry air), nitrogen, and argon can be used. Therefore, similar to the above embodiment, a large flow rate of degassed liquid L can be achieved, and the discharge efficiency of gas G can be improved. Furthermore, in Figure 13 and Figure 14 In the middle, only the shell 3 is shown in cross-section.

[0117] exist Figure 13 In the method shown, purge gas SG is not supplied to the first gas port 37 and the second gas port 38, but purge gas GS is supplied to the gas port 36, and liquid L is supplied to the liquid supply port 34 of the degassing module 1. Figure 13 The method shown can also be performed in purge mode or in a combined mode.

[0118] During the purging mode Figure 13 In the method shown, gas port 36 is designated as a gas supply port, and the first gas port 37 and the second gas port 38 are designated as exhaust ports open at atmospheric pressure. Then, purge gas GS is supplied to gas port 36, and liquid L is supplied to the liquid supply port 34 of the degassing module 1. The supply of purge gas SG to gas port 36 can be achieved, for example, by connecting a gas supply device (not shown) such as a gas cylinder and regulator to gas port 36 via piping, and operating the gas supply device. Thus, the gas G that has passed through the plurality of hollow fiber membranes 22 is swept by the purge gas SG supplied to gas port 36 and discharged (open to the atmosphere) from the first gas port 37 and the second gas port 38.

[0119] In the combination pattern Figure 13In the method shown, gas port 36 is designated as a gas supply port, and the first gas port 37 and the second gas port 38 are designated as suction ports. Then, purge gas GS is supplied to gas port 36 to suction the first gas port 37 and the second gas port 38, and liquid L is supplied to the liquid supply port 34 of the degassing module 1. The suction at the first gas port 37 and the second gas port 38 can be configured as described in the above embodiment. Thus, gas G that has permeated through the plurality of hollow fiber membranes 22 is swept by the purge gas SG supplied to gas port 36, and is suctioned to the first gas port 37 and the second gas port 38, and discharged from the first gas port 37 and the second gas port 38. This improves the discharge efficiency of gas G that has permeated through the plurality of hollow fiber membranes 22.

[0120] exist Figure 14 In the method shown, purge gas SG is not supplied to gas port 36, but purge gas GS is supplied to the first gas port 37 and the second gas port 38, and liquid L is supplied to the liquid supply port 34 of the degassing module 1. Figure 14 The method shown can be performed in either purge mode or a combination mode.

[0121] During the purging mode Figure 14 In the method shown, the first gas port 37 and the second gas port 38 are designated as gas supply ports, and the gas port 36 is designated as an exhaust port open at atmospheric pressure. Then, purge gas GS is supplied to the first gas port 37 and the second gas port 38, and liquid L is supplied to the liquid supply port 34 of the degassing module 1. The supply of purge gas SG to the first gas port 37 and the second gas port 38 can be achieved, for example, by connecting a gas supply device (not shown) to the first gas port 37 and the second gas port 38 via piping or the like, and operating the gas supply device. Thus, the gas G that has passed through the plurality of hollow fiber membranes 22 is swept by the purge gas SG supplied to the first gas port 37 and the second gas port 38 and discharged from the gas port 36 (open to the atmosphere).

[0122] In the combination pattern Figure 14In the method shown, the first gas port 37 and the second gas port 38 are designated as gas supply ports, and the gas port 36 is designated as a suction port. Then, purge gas GS is supplied to the first gas port 37 and the second gas port 38 to suction the gas port 36, and liquid L is supplied to the liquid supply port 34 of the degassing module 1. The suction at the gas port 36 can be configured as in the embodiment described above. Thus, the gas G that has permeated through the multiple hollow fiber membranes 22 is swept by the purge gas SG supplied to the first gas port 37 and the second gas port 38, and then suctioned to the gas port 36 and discharged from the gas port 36. This improves the discharge efficiency of the gas G that has permeated through the multiple hollow fiber membranes 22.

[0123] Explanation of reference numerals in the attached figures

[0124] 1-Degassing module, 1A-Degassing module, 1B-Degassing module, 2-Degassing element, 2a-First element end, 2b-Second element end, 2α-First degassing element, 2β-Second degassing element, 2γ-Third degassing element, 2δ-Fourth degassing element, 3-Shell, 3B-Shell, 4-Element connection part, 4α-First element connection part, 4β-Second element connection part, 4γ-Third element connection part, 5-Baffle, 6-First end communicating space forming part, 6A-First end communicating space forming part, 7-Separation part, 21-Liquid flow pipe, 21a-Hollow part, 21b-First end liquid flow pipe opening, 21c-Second end liquid flow pipe opening, 21d-Opening, 21e-End, 21f-End, 22-Hollow fiber membrane, 22a-Hollow part, 22b-First end hollow fiber 22c - Second end hollow fiber membrane opening, 24 - First fixing part, 25 - Second fixing part, 31 - Cylindrical part, 31B - Cylindrical part, 32 - First cover part, 33 - Second cover part, 34 - Liquid supply port, 35 - Liquid discharge port, 36 - Gas port, 36α - First gas port, 36β - Second gas port, 36γ - Third gas port, 37 - First end gas port, 38 - Second end gas port, 41 - Connecting cover, 42 - Connecting pipe, D - Extension direction, D1 - First extension direction, D2 - Second extension direction, G - Gas, L - Liquid, R1 - Internal region, R2 - External region, S1 - Intermediate connecting space, S2 - Intermediate liquid flow path, S3 - First end connecting space, S4 - Space, S5 - Second end connecting space, SG - Purge gas.

Claims

1. A degassing module, comprising: Multiple degassing elements have a liquid flow tube with multiple openings extending in an extension direction and multiple hollow fiber membranes disposed around the liquid flow tube in a manner that covers the multiple openings; A housing that accommodates the plurality of degassing elements in such a manner that the plurality of degassing elements are arranged in the extending direction; The component connection portion is connected to the first-side degassing element and the second-side degassing element that are adjacent in the extension direction among the plurality of degassing elements, and forms an intermediate connecting space and an intermediate liquid flow path. The intermediate connecting space is connected to the hollow portions of the plurality of hollow fiber membranes of the first-side degassing element and the hollow portions of the plurality of hollow fiber membranes of the second-side degassing element. The intermediate liquid flow path is connected to the hollow portions of the liquid flow tubes of the first-side degassing element and the hollow portions of the liquid flow tubes of the second-side degassing element. and The partition divides the area within the housing into an internal region comprising the hollow portion of the multiple hollow fiber membranes and an external region comprising the hollow portion of the liquid flow tube, with the multiple hollow fiber membranes as boundaries. The housing has: A liquid supply port is used to supply liquid to the hollow portion of the liquid flow tube; A liquid discharge port for discharging the liquid flowing out of the liquid flow pipe; and A gas port is used to discharge gas that has permeated through the plurality of hollow fiber membranes. The gas port is connected to the component connection part and communicates with the intermediate communication space.

2. The degassing module according to claim 1, wherein, The plurality of degassing elements includes a first end degassing element located at the end of a first extension direction which is one direction in the extension direction, and a second end degassing element located at the end of a second extension direction which is the opposite direction to the first extension direction in the extension direction. The end of the hollow portion of the liquid flow tube of the first end degassing element in the first extension direction is closed. The liquid supply port is connected to the end of the liquid flow tube of the second end degassing element on the second extension direction side.

3. The degassing module according to claim 2, further comprising a first end-connecting space forming portion, the first end-connecting space forming portion being connected to the end of the first end-degassing element on the first extending direction side, and forming a first end-connecting space communicating with the hollow portions of the plurality of hollow fiber membranes of the first end-degassing element. The housing has a first end gas port that is connected to and communicates with the first end communication space.

4. The degassing module according to claim 2, wherein, A second end communication space is formed on the second extension direction side of the second end degassing element, which communicates with the hollow portion of the plurality of hollow fiber membranes of the second end degassing element. The housing has a second end gas port that is adjacent to and communicates with the second end communication space.

5. The degassing module according to claim 2, further comprising a first end-connecting space forming portion, the first end-connecting space forming portion being connected to the end of the first end-degassing element on the first extending direction side, and forming a first end-connecting space communicating with the hollow portions of the plurality of hollow fiber membranes of the first end-degassing element. A second end communication space is formed on the second extension direction side of the second end degassing element, which communicates with the hollow portion of the plurality of hollow fiber membranes of the second end degassing element. The housing has: A first-end gas port is connected to and communicates with the first-end communicating space forming portion; and The second gas port is adjacent to and connected to the second end communication space.

6. The degassing module according to any one of claims 2 to 5, wherein, Each of the plurality of degassing elements has: The first fixing part, located at the end of the first extending direction, i.e. the end of the first element, seals the liquid flow tube and the plurality of hollow fiber membranes, and fixes the plurality of hollow fiber membranes to the liquid flow tube by opening the hollow part of the liquid flow tube and the hollow part of the plurality of hollow fiber membranes. and The second fixing part, located at the end in the second extending direction, i.e., the end of the second element, seals the liquid flow tube and the plurality of hollow fiber membranes, and fixes the plurality of hollow fiber membranes to the liquid flow tube by leaving the hollow portions of the liquid flow tube and the hollow portions of the plurality of hollow fiber membranes open. The component connection portion has: A connecting cover is connected to the second fixing part of the first side degassing element and the first fixing part of the second side degassing element, and covers the space between the first side degassing element and the second side degassing element; and A connecting pipe is connected to the liquid flow pipe of the first-side degassing element and the liquid flow pipe of the second-side degassing element. The gas port is connected to the connecting cover.

7. A method for degassing a liquid, comprising using the degassing module according to any one of claims 1 to 6 to degas the liquid, wherein, The gas port of the degassing module is evacuated, and liquid is supplied to the liquid supply port of the degassing module.

8. A method for degassing a liquid, comprising using the degassing module of claim 5 to degas the liquid, wherein, Purge gas is supplied to at least one of the gas ports, the first end gas port, and the second end gas port of the degassing module, and liquid is supplied to the liquid supply port of the degassing module.

9. The method for degassing a liquid according to claim 8, wherein, Purge gas is supplied to the gas port of the degassing module.

10. The method for degassing a liquid according to claim 9, wherein, The first and second gas ports of the degassing module are evacuated.

11. The method for degassing a liquid according to claim 8, wherein, Purge gas is supplied to the first gas port and the second gas port of the degassing module.

12. The method for degassing a liquid according to claim 11, wherein, The gas port of the degassing module is evacuated.

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