JP2006198495A - Hollow fiber membrane module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hollow fiber membrane module having a good filtering capacity. <P>SOLUTION: The hollow fiber membrane module is constituted by inserting four water permeable protective cylinders 21a or the like having a fan shape on a plan view in a cylindrical housing 11, inserting hollow fiber membrane bundles 15 in four water permeable protective cylinders 21a or the like and interposing four spacers 30 between four water permeable protective cylinders 21a or the like. The cylindrical housing 11, the protective cylinders 21a or the like, the spacers 30 and the hollow fiber membrane bundles 15 are integrated with adhesive layers 16. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a hollow fiber membrane module used for water treatment in various fields.

  Various types of hollow fiber membrane modules are known. For example, a plurality of hollow fiber membrane bundles, which are aggregates of several hundred hollow fiber membranes, are contained in a housing (or case or case housing). The charged one is used.

If the plurality of hollow fiber membrane bundles are in close contact with each other, the liquid flow may deteriorate, and the filtration performance of the hollow fiber membranes may not be sufficiently exhibited. In patent document 1, the said problem is solved by inserting a hollow fiber membrane bundle in the protection cylinder made from a net.
JP 2002-126465 A

  This invention makes it a subject to provide the hollow fiber membrane module which can improve filtration performance with simple structure.

  The present invention is a hollow fiber membrane module in which a plurality of hollow fiber membrane bundles are inserted into a cylindrical housing as means for solving the problem, and at least one end side of the plurality of hollow fiber membrane bundles, Provided is a hollow fiber membrane module in which a membrane bundle and a housing are integrated by an adhesive layer, and a spacer is interposed between the hollow fiber membrane bundles, and the radial length of the spacer is not more than half of the housing diameter. .

  In another aspect of the present invention, a plurality of spacers interposed between the membrane bundles are arranged in the radial direction of the housing, and the total length in the radial direction is less than half of the housing diameter. A hollow fiber membrane module according to Item 1, is provided.

  By interposing a spacer between the hollow fiber membrane bundles, a gap can be secured between the hollow fiber membrane bundles, so that the liquid can move smoothly and the filtration performance can be improved. Furthermore, since the volume occupied by the spacer is small, the amount of adhesive can be increased, and the adhesive strength can be increased.

  The hollow fiber according to claim 1 or 2, wherein the hollow fiber membrane bundle is inserted in a water-permeable protective cylinder and a spacer is disposed between the protective cylinders. A membrane module is provided.

  As another means for solving the problems, the present invention includes four bundles of hollow fiber membranes having a fan-shaped planar shape, and each of the two bundles of hollow fiber membranes is measured in two in one direction. The hollow fiber membrane module according to any one of claims 1 to 3, wherein four spacers are arranged.

  By using four spacers in this way, for example, the total mass is increased compared to the case where cross spacers are used between four bundles of hollow fiber membranes (a cross-like gap is formed in plan view). Can be suppressed.

  In the hollow fiber membrane module of the present invention, since a plurality of spacers are interposed between a plurality of hollow fiber membrane bundles, a cross-shaped gap can be secured between the hollow fiber membrane bundles. For this reason, since the flow of the liquid is improved, the filtration performance is improved and the amount of the adhesive can be increased, so that the adhesive strength between the spacer and the film bundle can be increased.

  Hereinafter, it demonstrates with drawing. 1 is a perspective view of a hollow fiber membrane module, FIG. 2 is a perspective view of a spacer used in FIG. 1, FIG. 3 is a perspective view of a protective cylinder used in FIG. 1, and FIG. 4 is a hollow fiber of FIG. It is a figure for demonstrating the assembly process of a membrane module.

  As shown in FIG. 1, the hollow fiber membrane module 10 has a cylindrical housing 11 in which four bundles of hollow fiber membrane bundles 15 whose planar shape (cross-sectional shape in the width direction) is a fan shape are inserted.

  The four hollow fiber membrane bundles 15 are respectively inserted into the four protective cylinders 21a, 21b, 21c, and 21d, and the four protective cylinders 21a and the like are inserted into the cylindrical housing 11. 21a etc. may not be present. In that case, the hollow fiber membrane bundle 15 may be bundled with a band or the like and bundled into the cylindrical housing 11.

  Between the four bundles of hollow fiber membranes 15, a cross-shaped gap 35 is formed from one end side to the other end side, and a spacer 30 is disposed in the cross-shaped gap 35. As shown in FIG. 2, the spacer 30 is plate-shaped and has two through holes 33 in the thickness direction. A total of four spacers 30 are arranged in two directions in one direction of the cross-shaped gap 35, and the cross-shaped gap 35 has a portion without the spacer 30. Furthermore, since the amount of the adhesive can be increased by filling the cross-shaped gap 35 with the adhesive, the adhesive strength between the spacer and the protective cylinder (membrane bundle) can be increased.

  The spacer 30 has a short side of 10 to 30 mm, a long side of 20 to 50 mm, a thickness of 5 to 15 mm, and two through holes (diameter 5 to 15 mm) at equal intervals in the thickness direction. Can be used.

The length (L ₁ ) of the long side of the spacer 30 becomes the radial direction (housing radial direction) (the same applies to the other drawings shown below), and this length L ₁ is the diameter (D) of the housing. Less than half the length (1 / 2D ≧ L ₁ ). By this way to adjust the length of L ₁ and D, it is possible to adjust the size of the gap 35 in the desired range, it is possible to increase the bonding strength of the spacer and the protective tube (bundle).

  Next, an embodiment of a method for assembling the hollow fiber membrane module will be described step by step.

(First step)
In the first step, the four liquid-permeable protective cylinders 21 a are combined and inserted into the cylindrical housing 11.

  The cylindrical housing 11 is open at one end or both ends, and includes ports 12 and 13 serving as a raw water inlet, a permeate outlet, or a concentrate outlet on the side surface. The size and height of the cylindrical cylindrical housing 11 are determined in consideration of the installation location, filtration performance, and the like.

  There is no restriction | limiting in particular in the material of the cylindrical housing 11, It can select suitably by process target liquids, such as supply raw water, installation environment, etc. The material of the cylindrical housing 11 is polysulfone resin, polyvinyl chloride resin, polyolefin resin such as polypropylene and polyethylene, acrylic resin, polymethyl methacrylate resin, polycarbonate resin, AS resin, polytetrafluoroethylene, polyfluoride. Fluorine-containing resins such as vinylidene fluoride, iron, stainless steel, ceramics, glass and the like can be mentioned, and a multilayer structure combining these may also be used.

  The protective cylinder 21 a and the like are as shown in FIG. 3 and are formed from a liquid-permeable net 22. The size and height of the protective cylinder 21a and the like in FIG. 3 are set in association with the size (inner diameter) and height of the housing.

  The protective cylinder 21a and the like have permeability to liquid such as raw water or permeated water, and the permeability is preferably such that the filtration performance of the hollow fiber membrane to be used is not impaired. Since the protective cylinder 21a and the like have liquid permeability, the raw water or the permeated water can freely move in the housing.

  The protective cylinder 21a and the like may be any one having liquid permeability in addition to the illustrated net, and may be a porous body having pores on the surface. For the material of the protective cylinder 21a, a polyolefin resin such as polyethylene or polypropylene, a polysulfone resin, a polyethylene terephthalate resin, a polyamide resin, a fluorine-containing resin, an AS resin, an ABS resin, a metal such as stainless steel, ceramics, or the like is used. be able to. The protective cylinder 21 is preferably made of a polyolefin resin because it is inexpensive and has good workability, and a net-like one having a thickness of about 0.5 to 8 mm is preferable because it has an appropriate strength as a protective cylinder.

  In this step, as shown in FIG. 4, when the protective cylinder 21a or the like is inserted, the four spacers 30 are respectively disposed at the upper end and the lower end of the protective cylinder 21a or the like. Enter. Since the spacers 30 are arranged between the protective cylinders 21a and the like, and the gaps are provided between the protective cylinders, the raw water or the permeated water can be moved more smoothly, so that the filtration performance is improved.

  In addition, the four protective cylinders 21a and the spacer 30 may be united by a detachable binding means (rubber band, other protective cylinders of a size that can wrap the entire four protective cylinders). it can.

  The material of the spacer 30 is not particularly limited, but it is preferable to use the same resin as the thermosetting adhesive used in the subsequent process from the viewpoint of increasing the adhesive strength.

(Second step)
The next step is a step of inserting the hollow fiber membrane bundle 15 composed of a large number of hollow fiber membranes into the protective cylinder 21a or the like. In this step, after the hollow fiber membrane bundle 15 is inserted, the hollow fiber membrane bundle 15 (preferably, the ends of the hollow fiber membrane bundle are trimmed) and the end of the spacer 30 are bonded with a thermosetting adhesive. Temporary fixing to seal can also be performed. At this time, if necessary, a shift prevention jig may be attached to the inner wall surface of the cylindrical housing 11 to prevent the protective cylinder 21a and the like from shifting. The slip prevention jig can be inserted between the inner wall surface of the cylindrical housing 11 and the outer peripheral surface of the protective cylinder 21a and the like, and can press and fix the protective cylinder 21a and the like.

  The hollow fiber membrane may be a commonly used one, and the material is not particularly limited. For example, cellulose acetate resin, cellulose resin, polyether sulfone resin, polysulfone resin, polyacrylonitrile resin, polyvinyl alcohol resin, polyolefin resin, polymethyl methacrylate resin, fluorine-containing resin, etc. Can do.

There is no particular limitation on the size of the hollow fiber membrane bundle 15. In general, although it depends on the outer diameter of each hollow fiber membrane, it is preferably composed of about 100 to 100,000 hollow fiber membranes. The length of the hollow fiber membrane bundle is preferably 10 to 200 cm. The thickness of the hollow fiber membrane bundle 15 is not particularly limited, and is determined by the number of the hollow fiber membranes used. If the membrane cross-sectional area is 3 to 3000 cm ² , the operability in sealing the hollow fiber membrane bundle is improved. More preferably, it is the range of 10-1000 cm < ² >.

(Third step)
The third step is a step of injecting a thermosetting adhesive into both ends, and bonding the inner peripheral surface of the cylindrical housing 11, the protective cylinder 21 a, the spacer 30, and the ends of the hollow fiber membrane bundle 15. In addition, as a procedure, after fixing one end side with an adhesive agent first, the other end side is fixed with an adhesive agent.

  In the third step, the thermosetting adhesive may be injected in one stage, or may be injected in two or more stages. The injection of the adhesive at each stage when dividing and injecting into two or more stages is performed by injecting the adhesive at the next stage after the exothermic peak temperature at the time of the curing reaction of the adhesive has elapsed after the injection of the adhesive at the previous stage. It is preferable to apply a method for suppressing the exothermic peak temperature during the curing reaction of the adhesive.

  When the thermosetting adhesive is divided into two or three stages and injected, the next stage after the exothermic peak temperature during the adhesive curing reaction has elapsed after the injection of the previous stage (one or two stages) of adhesive. (2 steps or 3 steps) adhesive is injected. The injection amount of the adhesive may be equal in each step, or may be decreased or increased for each step. The same is true for four or more stages.

  In the process of this process, both the inner peripheral surface of the housing 11, the protective cylinder 21a, and the like, the spacer 30 (the surface 31 and the back surface of the surface 31), and both ends of the hollow fiber membrane bundle 15 are sealed and fixed with an adhesive.

  In this way, the thermosetting adhesive (16 in FIG. 1 indicates the cured adhesive layer) is injected in two or more stages, so that the entire amount is bonded compared to the case where the entire amount is injected at once. Since the exothermic peak temperature during the curing reaction of the agent can be suppressed, the filtration performance of the hollow fiber membrane is not adversely affected, and distortion of the adhesive layer 16 due to heat can also be prevented.

  The exothermic temperature can be controlled while measuring the temperature at which the adhesive is cured in the bonding step. In addition, the heat generation temperature can be controlled by preliminarily determining the amount of adhesive to be injected at each stage through preliminary experiments.

  In the third step, it is desirable to maintain the exothermic peak temperature at 110 ° C. or lower from the viewpoint of not adversely affecting the separation performance of the hollow fiber membrane.

  Further, as shown in FIG. 2, since the spacer 30 has a through hole 33, the injected adhesive moves to the adjacent protective cylinder 21a and the like and the hollow fiber membrane bundle 15 through the through hole 33. Work efficiency is improved.

  As thermosetting adhesives (including room temperature curing type or heat curing type), urea resin adhesive, melamine resin adhesive, phenol resin adhesive, resorcinol resin adhesive, epoxy resin adhesive, polyurethane adhesive, vinyl urethane An adhesive can be mentioned, and among these, a polyurethane adhesive is preferable.

  In the third step, a known centrifugal bonding method (centrifugal molding method) (Japanese Patent Laid-Open Nos. 51-93788, 52-38797, 61-171503, 61-171504). No. gazette etc.) can be applied and bonded.

  After completion of the third step, the end portion of the hollow fiber membrane bundle 15 sealed with the adhesive is cut together with the adhesive layer 16 to be opened. As a cutting method for opening, a blade such as a slicer, scraping with an end mill, cutting with a rotating disk, or the like can be applied. A slicer can be cut without shavings remaining on the end face, and an end mill or a rotating disk has an advantage of high cutting speed. Therefore, a method of cutting them in combination is preferable.

  By the above method, the hollow fiber membrane module 10 shown in FIG. 1 is obtained. Note that, when the hollow fiber membrane module 10 is in practical use, the end of the cylindrical housing 11 in an open state is closed with a cap or the like.

  Next, another embodiment will be described with reference to FIGS. 5, 6, and 7. 5, 6, and 7 are all plan views of the hollow fiber membrane module. The spacers are hatched to make the drawing easier to see. It should be noted that parts having the same numbers as those in FIG. 1 are the same.

  In the hollow fiber membrane module 50 of FIG. 5, a cross-shaped spacer 55 is disposed between four protective cylinders 21a, 21b, 21c, and 21d, and plate-shaped spacers 56, 57, 58, and 59 are disposed between the two protective cylinders, respectively. Is arranged.

  The cross-shaped spacer 55 is a combination of two plate-shaped spacers having the same length as shown in FIG. 2, and has a plurality of through holes 33 in the thickness direction.

The sum of the length in one direction (the length in the radial direction) (L ₂ ), the length in the radial direction of the spacer 56 (L ₃ ), and the length in the radial direction of the spacer 58 (L ₄ ) ( L ₂ + L ₃ + L ₄ ) is a length less than half of the diameter (D) of the housing (1 / 2D ≧ L ₂ + L ₃ + L ₄ ). The cross spacer 55, the plate spacers 57 and 59, and the diameter of the housing have the same relationship.

By adjusting the lengths of L ₂ + L ₃ + L ₄ and D in this way, the size of the gap 35 can be adjusted to a desired range, and the adhesive strength between the spacer and the protective cylinder (membrane bundle) is increased. Can do.

  In the hollow fiber membrane module 50, since the four protective cylinders 21a to 21d are integrated via the cross-shaped spacer 55 arranged in the center, the fixing strength is increased. Furthermore, since the adhesive can be filled into the four gaps 35 separated, the amount of the adhesive can be increased, and the adhesive strength between the spacer and the film bundle can be increased.

  In the hollow fiber membrane module 60 of FIG. 6, plate-like spacers 61 and 62 are arranged at intervals so that a gap 35 is formed between the two protective cylinders 21a and 21b, and the two protective cylinders 21b and 21c. Between the two protective cylinders 21c and 21d, the plate spacers 65 and 64 are arranged so that the gap 35 is formed between them. 66 is arranged at intervals, and plate-like spacers 67, 68 are arranged at intervals so that a gap 35 is formed between the two protective cylinders 21d, 21a. A cross-shaped gap 35 is formed at the center.

  The total radial length of the plate spacers 61, 62, 65, 66 is less than half of the diameter of the housing, and the total radial length of the plate spacers 63, 64, 67, 68. Is less than half the diameter of the housing. By adjusting the radial length of the plate spacer and the housing diameter in this way, the size of the gap 35 can be adjusted to a desired range, and the adhesion strength between the spacer and the protective cylinder (membrane bundle) is increased. Can do.

  In the hollow fiber membrane module 60, since the adhesive can be filled in a total of five separated gaps 35, the amount of the adhesive can be increased, and the adhesive strength between the spacer and the membrane bundle can be increased.

  In the hollow fiber membrane module 70 of FIG. 7, a cross-shaped spacer 75 is disposed between the four protective cylinders 21a, 21b, 21c, and 21d, and four gaps 35 are formed.

  The cross-shaped spacer 75 is a combination of plate-shaped spacers having the same length as shown in FIG. 2 and has a plurality of through holes 33 in the thickness direction.

  The length in one direction (the length in the radial direction) of the cross spacer 75 is not more than half the diameter of the housing. By adjusting the radial length of the cross-shaped spacer and the housing diameter in this way, the size of the gap 35 can be adjusted to a desired range, and the adhesion strength between the spacer and the protective cylinder (membrane bundle) can be increased. Can do.

  In the hollow fiber membrane module 70, since the four protective cylinders 21a to 21d are integrated via the cross-shaped spacer 75 disposed at the center, the fixing strength is increased. Furthermore, since the adhesive can be filled in the four gaps 35 separated, the amount of the adhesive can be increased, and the adhesive strength between the spacer and the film bundle can be increased.

  The hollow fiber membrane module shown in FIGS. 5, 6, and 7 can be assembled in the same manner as the hollow fiber membrane module of FIG.

  The hollow fiber membrane module of the present invention includes river water, lake water filtration, nuclear power generation, thermal power generation water filtration, condensate filtration, water sterilization, waste liquid filtration and recovery, filtration in food production processes, organic solvent It can be used for applications such as filtration and separation, liquid degassing, and liquid-liquid extraction. Among these, it is particularly suitable for applications that require periodic membrane cleaning and sterilization, such as river water and lake water filtration, and water disinfection.

The perspective view of a hollow fiber type membrane module. The perspective view of a spacer. The perspective view of a protection cylinder. The perspective view of the state which combined the four protection cylinders of FIG. The top view of the hollow fiber membrane module of other embodiment. The top view of the hollow fiber membrane module of other embodiment. The top view of the hollow fiber membrane module of other embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Hollow fiber type membrane module 11 Housing 15 Hollow fiber membrane bundle 16 Adhesive layer 21a-21d Protective cylinder 30 Spacer

Claims (4)

  A hollow fiber membrane module in which a plurality of hollow fiber membrane bundles are inserted into a cylindrical housing, and at least one end side of the plurality of hollow fiber membrane bundles, the membrane bundles and the membrane bundle and the housing are integrated by an adhesive layer. A hollow fiber membrane module in which a spacer is interposed between the hollow fiber membrane bundles, and the length of the spacer in the radial direction is not more than half of the housing diameter.   The hollow fiber membrane module according to claim 1, wherein a plurality of spacers interposed between the membrane bundles are arranged in the radial direction of the housing, and the total length in the radial direction is not more than half of the housing diameter.   The hollow fiber membrane module according to claim 1 or 2, wherein the hollow fiber membrane bundle is inserted in a water-permeable protective cylinder, and a spacer is disposed between the protective cylinders. 4 bundles of hollow fiber membranes having a fan-shaped planar shape are inserted, and a total of four spacers are arranged between the four bundles of hollow fiber membranes, two in one direction. The hollow fiber membrane module in any one of -3.

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