JP3834538B2 - Hollow fiber membrane module - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a recycle-type hollow fiber membrane module that reuses components.
[0002]
[Prior art and problems to be solved by the invention]
As a recent trend in various fields, from the viewpoint of saving resources and reducing waste, there is a demand for recycled products that can reuse parts.
[0003]
The hollow fiber membrane module has a large number of hollow fiber membranes accommodated in a case housing. Besides, a hollow fiber membrane module that uses a fixing frame for accommodating and fixing the hollow fiber membranes is also widely used. In order to increase efficiency, the hollow fiber membrane module itself tends to increase in size. And, in such a hollow fiber membrane module, the fixing frame together with the case housing occupies a large mass and capacity, and when discarded without being reused, it will be contrary to the request for reducing the amount of waste, In the conventional hollow fiber membrane module, the reuse of the fixing frame is not considered.
[0004]
In the hollow fiber membrane modules disclosed in JP-A-62-1409, JP-A-63-69509, and JP-A-7-148421, all use a fixing frame. However, there is no disclosure that Japanese Patent Application Laid-Open No. 2000-185220 uses a partition plate similar to a fixing frame. In any prior art, if the fixing frame or partition plate and the hollow fiber membrane are mechanically separated and the fixing frame or partition plate is to be reused, the shape of the fixing frame or partition plate and It is considered that the fixing frame or the partition plate is damaged due to the structure, the state of bonding with the hollow fiber membrane by the adhesive and the fixing frame or the partition plate, and the like, and the reuse is difficult.
[0005]
An object of the present invention is to provide a hollow fiber membrane module that can easily separate a hollow fiber membrane reinforcing material and a hollow fiber membrane, and at least reuse a case housing and a hollow fiber membrane reinforcing material. Is to provide.
[0006]
[Means for Solving the Problems]
The present inventor re-establishes parts including the reinforcing frame by setting the shape and structure of the reinforcing frame for accommodating and fixing the hollow fiber membrane bundle and the coupling state of the hollow fiber membrane bundle and the reinforcing frame in association with each other. By using it, it has achieved the reduction of waste and the effective use of resources.
[0007]
The present invention is a hollow fiber membrane module in which a plurality of bundles of hollow fiber membranes are accommodated in a vertically long case housing having a liquid inlet / outlet as means for solving the problem,
The material of the case housing is fiber reinforced resin,
In the case housing, 1 or 2 reinforcing members for hollow fiber membrane bundles composed of a combination of an annular outer frame and a partition plate that divides the annular outer frame into eight or more fan-shaped holes are loaded,
One end or both ends of a plurality of hollow fiber membrane bundles are inserted into the fan-shaped holes of the reinforcing material for hollow fiber membrane bundles, and the hollow fiber membranes and the hollow fiber membrane bundle and the reinforcing material for hollow fiber membrane bundles are fixed with an adhesive. And the adhesive is a urethane adhesive,
The hollow fiber membrane bundle is punched and separated from the reinforcing material for the hollow fiber membrane bundle, and at least the case housing and the reinforcing material for the hollow fiber membrane bundle can be reused for other hollow fiber membrane modules. A yarn membrane module is provided.
[0008]
In the above invention, since the reinforcing material and the hollow fiber membrane bundle can be separated by punching out the hollow fiber membrane bundle from the reinforcing material for the hollow fiber membrane bundle, the reinforcing material can be reused together with the case housing. . In the hollow fiber membrane module, the case housing and the reinforcing material occupy a large proportion (based on mass and volume), so that it is possible to reduce waste and effectively use resources.
[0009]
In the present invention, the length of the fixed portion with an adhesive from the viewpoint of facilitating the separation, the hollow fiber membrane bundle to the length L ₁ of a hollow fiber membrane bundle for reinforcement and the hollow fiber membrane bundle as described above preferably L ₂ ratio (L 2 _{/ L 1)} is 1/10 or less, filling the area ratio of the hollow fiber membrane bundle to the total area of the fan-shaped hole of the hollow fiber membrane bundle for reinforcement is 50% or more It is preferable.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the hollow fiber membrane module of the present invention will be described with reference to the drawings. FIG. 1 is a schematic partial longitudinal sectional view of a hollow fiber membrane module. 2 is a plan view of the hollow fiber membrane bundle reinforcing material used in FIG. 1, and FIG. 3 is a front view of FIG. FIG. 4 is a schematic cross-sectional view in the radial direction of another embodiment of FIG. 1, and is a view for explaining an attachment state of the reinforcing material for the hollow fiber membrane bundle. FIG. 5 is a schematic partial longitudinal sectional view of a hollow fiber membrane module according to another embodiment. 1 and 5 show a cross section of the case housing (the cylindrical main body portion and the cap), but the others are not cross sections, and hatching is added to clarify the distinction of each member. 2 and 4 show the hollow fiber membrane bundle in the fan-shaped holes h or e in order to explain the accommodation state of the hollow fiber membrane bundle.
[0011]
In the hollow fiber membrane module 10 shown in FIG. 1, an outer shell (case housing) is formed from a cylindrical main body 12, an upper cap 14, and a lower cap 15. Note that the bottom portion may be provided by closing the lower portion of the cylindrical main body portion 12 without providing the lower cap 15. These cylindrical main body 12, upper cap 14, and lower cap 15 are preferably made of fiber reinforced resin or stainless steel.
[0012]
The upper cap 14 is provided with an upper inlet / outlet (raw water supply port or back pressure washing water supply port) 14a having a flange 14b, and the lower cap 15 has a lower liquid inlet / outlet (concentrated liquid outlet or outlet) having a flange 15b. A counter pressure washing water outlet 15a is provided.
[0013]
For example, a pipe 40 forming a raw water line is connected to the upper entrance 14a. At this time, it is desirable to interpose a sealing material between the flange 14b of the upper entrance 14a and the flange 41 of the pipe 40.
[0014]
For example, a pipe 42 forming a concentrate line is connected to the lower inlet / outlet 15a. At this time, it is desirable to interpose a sealing material between the flange 15b of the upper inlet / outlet 15a and the flange 43 of the pipe 42.
[0015]
A cylindrical permeate outlet 20 is provided at an upper portion of the side surface of the cylindrical main body portion 12 so as to protrude outward from the side surface. It is desirable that a protective outlet 25 having the same shape is detachably attached to the permeate outlet 20 by means of screwing or the like.
[0016]
By attaching such a protective inlet / outlet 25, for example, a pipe for connecting to the raw water tank can be connected via the protective outlet / outlet 25 without being directly connected to the permeate outlet 20. 20 is prevented from being damaged. Then, by making the protective door 25 detachable, when the protective door 25 is damaged, it can be easily replaced.
[0017]
A hollow fiber membrane bundle reinforcing material 50 is disposed on each opening side of the cylindrical main body 12. The hollow fiber membrane bundle reinforcing material 50 is bonded and fixed to the inner peripheral surface of the cylindrical main body 12. The reinforcing material 50 for the hollow fiber membrane bundle can be disposed other than both ends of the hollow fiber membrane bundle 16, for example, in the vicinity of the central portion in the length direction.
[0018]
As shown in FIGS. 2 and 3, the hollow fiber membrane bundle reinforcing member 50 includes a combination of an annular outer frame 51 and a plurality of partition plates 52 that partition the inside of the annular outer frame 51. The annular outer frame 51 is connected to the base portion 53 at the center. The hollow fiber membrane bundle reinforcing material 50 is preferably made of a fiber reinforced resin in order to make it lightweight and high in strength.
[0019]
The inside of the annular outer frame 51 has eight fan holes a to h surrounded by a part of the periphery (arc) of the annular outer frame 51 and the two partition plates 52. For example, the upper limit is not particularly limited, and is appropriately set according to the size of the hollow fiber membrane module to be applied.
[0020]
The width W ₁ of the annular outer frame 51 is preferably _{1 to} 30 mm, more preferably 5 to 20 mm, still more preferably 7 to 15 mm, and the thickness T ₁ is preferably 10 to 200 mm, more preferably 20 to 100 mm, More preferably, it is 30-60 mm.
[0021]
The width W ₂ of the partition plate 52 is preferably 1 to 30 mm, more preferably 5 to 20 mm, still more preferably 7 to 15 mm, and the thickness T ₂ is preferably 10 to 200 mm, more preferably 20 to 100 mm, and further Preferably it is 30-60 mm.
[0022]
As shown in FIG. 1 and FIG. 2, the hollow fiber membrane bundle 16 includes hollow fiber membranes 16, and hollow fiber membranes constituting the hollow fiber membrane bundle 16. The bundle 16, the annular outer frame 51, and the partition plate 52 are fixedly integrated with each other by the urethane adhesive 18. In addition, the hollow fiber membrane bundle 16 can coat | cover a part or all of the remaining part integrally fixed with the protection net | network.
[0023]
By using the reinforcing member 50 for the hollow fiber membrane bundle in this way, the hollow fiber membrane bundle 16 can be easily supported and fixed at the time of production and operation, and the hollow fiber membrane bundle 16 is flown by the flow of liquid in and out. It is prevented that each other shakes and repeats a collision and breaks. Furthermore, when the hollow fiber membrane module 10 is discarded, the hollow fiber membrane bundle reinforcing material 50 and the hollow fiber membrane bundle 16 are easily punched out by punching out the hollow fiber membrane bundle 16 accommodated and fixed in the fan holes a to h. Can be separated.
[0024]
Ratio of the length of the portion covered with the adhesive to the length (L ₁ ) of the hollow fiber membrane bundle 16 (the length of the portion covered with the adhesive from the end face of the hollow fiber membrane bundle 16) (L ₂ ) L ₂ / L ₁ ) is preferably 1/10 or less, more preferably 1/11 or less, and still more preferably 1/12 or less. L ₂ is equal to or less than the thickness T ₁ of the annular outer frame 50.
[0025]
By setting L ₂ / L ₁ in the above range, the length of the fixing portion in the hollow fiber membrane bundle 16 can be shortened, so that the reduction in the effective membrane area is reduced and the filtration performance during operation is enhanced. Further, when the hollow fiber membrane module 10 is discarded, the hollow fiber membrane bundle 16 accommodated and fixed in the fan holes a to h can be easily punched, so that the hollow fiber membrane bundle reinforcing material 50 and the hollow fiber membrane bundle 16 Separation becomes easier.
[0026]
The filling area ratio of the hollow fiber membrane bundle 16 with respect to the area of the fan-shaped holes a to h (the area of all fan-shaped holes or the area of individual fan-shaped holes) of the reinforcing member 50 for the hollow fiber membrane bundle is preferably 50 to 55% or more. More preferably, it is 55-60%, More preferably, it is 60-70%.
[0027]
By setting the filling area ratio within the above range, during operation, the filling ratio (accommodation number) of hollow fiber membranes per unit area can be increased, and as a result, the effective membrane area can be increased. Therefore, the filtration performance of the hollow fiber membrane module can be improved. Further, when the hollow fiber membrane module 10 is discarded, the ease of punching of the hollow fiber membrane bundle 16 accommodated and fixed in the fan-shaped holes a to h is further improved.
[0028]
As shown in FIG. 1, when the hollow fiber membrane bundle 16 is supported and fixed at both ends by the two hollow fiber membrane bundle reinforcing members 50, the mounting positions of the two hollow fiber membrane bundle reinforcing members 50 are displaced. It is important that there is no. When these attachment positions are displaced, the hollow fiber membrane bundle 16 is twisted, causing the hollow fiber membranes to be damaged. Further, when the hollow fiber membrane bundle 16 is twisted, unnecessary tension is applied to the hollow fiber membrane bundle reinforcing member 50, and the hollow fiber membrane bundle reinforcing member 50 may be damaged when punched out during disposal. There is. For this reason, it is desirable to provide positioning means, for example, as shown in FIG. 4 so that such a situation does not occur.
[0029]
The inner wall surface of the cylindrical main body 12, specifically, the upper inner wall surface on which the hollow fiber membrane bundle reinforcing material 50 is disposed, and the lower inner wall surface on which the hollow fiber membrane bundle reinforcing material 50 is disposed, respectively, Two positioning projections 30a and 30b in the direction are provided.
[0030]
On the other hand, the two hollow fiber membrane bundle reinforcing members 50 are also provided with positioning concave portions 55a and 55b at positions corresponding to the positioning convex portions 30a and 30b.
[0031]
When the hollow fiber membrane bundle 16 having both ends fixed to the hollow fiber membrane bundle reinforcing member 50 is accommodated in the cylindrical main body 12, the positioning convex portion 30a and the positioning concave portion 55a, and the positioning convex portion 30b and the positioning concave portion 55b are stored. And so that they are aligned with each other.
[0032]
By using such positioning means, the mounting positions of the two reinforcing members 50 for hollow fiber membrane bundles can be accommodated so that there is no deviation angle with respect to the same part.
[0033]
The hollow fiber membrane module 100 shown in FIG. 5 has a form in which two reinforcing members 50 for hollow fiber membrane bundles are connected to a support rod 60 made of stainless steel, and the other structure is the hollow fiber membrane module 10 of FIG. Is the same.
[0034]
Both ends of the support rod 60 are fixed to the base point portion 53 of the two reinforcing members 50 for hollow fiber membrane bundles by fixing means such as bolts.
[0035]
By using the reinforcing member 50 for a hollow fiber membrane bundle having such a support rod 60, the positioning means as shown in FIG. Is also easier. Further, at the time of disposal, since the two reinforcing members 50 for hollow fiber membrane bundles themselves are reinforced by the support rod 60, the punching operation becomes easy.
[0036]
In the hollow fiber membrane module of the present invention, the ratio (M ₂ / M ₁ × 100) of the total mass (M ₂ ) of the waste member in the hollow fiber membrane module to the total mass (M ₁ ) of the hollow fiber membrane module. Is 40% or less, that is, suitable for a large-sized hollow fiber membrane module in which the proportion of the case housing and the reinforcing member 50 for hollow fiber membrane bundles is high.
[0037]
【Example】
Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited to these examples.
[0038]
Example 1
A hollow fiber membrane module as shown in FIGS. 1 to 3 was produced. Details of each component are as follows.
[0039]
Case housing: The cylindrical main body 12 was made of FRP having an inner diameter of 450 mm (D), an outer diameter of 465 mm, and a length of 1110 mm, and upper and lower caps 14 and 15 made of SUS were attached to both ends.
[0040]
Permeated water outlet 20: An outlet having an opening diameter of 228 mm was provided at a position 210 mm from the end of the cylindrical main body 12, and a protective outlet 25 made of vinyl chloride resin was attached via an O-ring.
[0041]
Reinforcing material for hollow fiber membrane bundle: diameter 45 cm, annular outer frame width W ₁ 1.2 cm, thickness T ₁ 5 cm, partition plate width W ₂ 1 cm, thickness T ₂ 5 cm, one area of fan-shaped hole 150 cm ²
Hollow fiber membrane bundle: 2050 cellulose acetate hollow fiber membranes having an inner diameter of 0.8 mm, an outer diameter of 1.3 mm, and a length of 1110 mm (L ₁ ) make one bundle (end surface area 27.2 cm ² ). Housed each bundle. The hollow fiber membrane bundle is obtained by centrifugal sealing machine (manufactured by Toho Machine Industry Co., Ltd., horizontal centrifugal molding machine), and the hollow fiber membrane bundles located at both ends of the cylindrical main body 12 and the hollow fiber membrane bundle and the cylindrical shape. The inner wall surface of the main body 12 was adhesively sealed with a urethane-based adhesive [Coronate 4428: Nippon Run 4221 = 52: 48 (manufactured by Nippon Polyurethane Co., Ltd.)]. The adhesive layer thickness (L ₂ ) was 96 mm in total at both ends, and the effective membrane area was 110 m ² .
[0042]
L ₂ / L ₁ : 96/1110 = about 0.086
Filling area ratio of hollow fiber membrane bundle (end face) with respect to fan-shaped hole area: 81.6 / 150 × 100 = 54.4%
The hollow fiber membrane module 10 was used to perform a test filtration operation for river water, and the dismantling was performed after half a year. The upper cap 14 was removed from the hollow fiber membrane module 10, and the hollow fiber membrane bundle 16 was taken out together with the two reinforcing members 50 for the hollow fiber membrane bundle. Thereafter, the hollow fiber membrane bundle 16 was punched out from the two reinforcing members 50 for hollow fiber membrane bundles by a method of punching out after heating, and separated from each other. The two hollow fiber membrane bundle reinforcing members 50 were not damaged and could be reused.
[0043]
M ₂ / M ₁ × 100: (19 kg / 57 kg) / 100 = 33%
[0044]
【The invention's effect】
The hollow fiber membrane module of the present invention is easy to assemble during manufacture, has excellent filtration performance during operation, and easily separates the reinforcing material for the hollow fiber membrane bundle from the hollow fiber membrane bundle at the time of disposal. Therefore, at least the case housing and the reinforcing material for the hollow fiber membrane bundle can be reused.
[Brief description of the drawings]
FIG. 1 is a schematic partial longitudinal sectional view of a hollow fiber membrane module.
FIG. 2 is a plan view of a reinforcing material for a hollow fiber membrane bundle.
FIG. 3 is a front view of FIG. 2;
4 is a schematic cross-sectional view of another embodiment of the hollow fiber membrane module of FIG.
FIG. 5 is a schematic partial longitudinal sectional view of a hollow fiber membrane module according to another embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10, 100 Hollow fiber membrane module 12 Cylindrical main-body part 14 Upper cap 15 Lower cap 16 Hollow fiber membrane bundle 18 Urethane adhesive 50 Reinforcing material for hollow fiber membrane bundles

Claims (3)

A hollow fiber membrane module in which a plurality of hollow fiber membrane bundles are accommodated in a vertically long case housing having a liquid inlet / outlet,
The material of the case housing is fiber reinforced resin,
In the case housing, 1 or 2 reinforcing members for hollow fiber membrane bundles composed of a combination of an annular outer frame and a partition plate that divides the annular outer frame into eight or more fan-shaped holes are loaded,
One end or both ends of a plurality of hollow fiber membrane bundles are inserted into the fan-shaped holes of the reinforcing material for hollow fiber membrane bundles, and the hollow fiber membranes and the hollow fiber membrane bundle and the reinforcing material for hollow fiber membrane bundles are fixed with an adhesive. And the ratio (L ₂ / L ₁ ) of the length L ₂ of the portion fixed with the adhesive to the length L ₁ of the hollow fiber membrane bundle is 1/10 or less, and the adhesive is urethane-based adhesive The agent,
The hollow fiber membrane bundle is punched and separated from the reinforcing material for the hollow fiber membrane bundle, and at least the case housing and the reinforcing material for the hollow fiber membrane bundle can be reused for other hollow fiber membrane modules. Yarn membrane module. The hollow fiber membrane module of claim 1, wherein the filling area ratio of the hollow fiber membrane bundle is 50% or more to the total area of the fan-shaped hole of the hollow fiber membrane bundle for reinforcement. The ratio (M ₂ / M ₁ × 100) of the total mass (M ₂ ) of waste members in the hollow fiber membrane module to the total mass (M ₁ ) of the hollow fiber membrane module is 40% or less. Or the hollow fiber membrane module of 2.

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