JP3850775B2 - Hollow fiber membrane module - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hollow fiber membrane module.
[0002]
[Prior art and problems to be solved by the invention]
There is a type of hollow fiber membrane module in which a required number of hollow fiber membrane bundles are accommodated in a case housing having a liquid inlet / outlet, and liquid (raw water, permeated water, etc.) enters and exits into the case housing only by the liquid inlet / outlet, Such types are often applied to relatively large modules.
[0003]
However, this type when filtration is operated using a hollow fiber membrane module, this means that the raw water or the like to enter and exit from the liquid entrance, only the hollow fiber membrane bundle at a position facing the liquid doorway, the raw water such as As a result of continuing to receive the pressure accompanying the entry and exit, the plurality of hollow fiber membrane bundles sway and repeatedly collide with each other.
[0004]
When such a situation occurs, there is a problem that breakage or the like of the hollow fiber membrane constituting the hollow fiber membrane bundle is likely to occur, and the replacement frequency of the hollow fiber membrane at a specific part in the hollow fiber membrane bundle is increased. There are problems such as interruption of filtration operation due to replacement work and increase in operating cost.
[0005]
An object of the present invention is to provide a hollow fiber membrane module capable of performing a stable filtration operation continuously for a long period of time by improving the mounting structure of the hollow fiber membrane bundle.
[0006]
[Means for Solving the Problems]
According to the first aspect of the present invention, as a means for solving the problem, a plurality of hollow fiber membrane bundles are accommodated in a vertically long case housing having a liquid inlet / outlet, and the hollow fiber membrane bundle is one end or both ends of the plurality of hollow fiber membranes. Is a hollow fiber membrane module integrated with an adhesive, and provides a hollow fiber membrane module in which the plurality of hollow fiber membranes are bound by a bundle binding means.
[0007]
The present invention is not limited to all the hollow fiber membrane bundles bundled by the binding means. As long as the problems of the present invention can be solved, some hollow fiber membrane bundles (for example, the hollow fiber membrane bundles are annularly multiplexed). The hollow fiber membrane bundle (located in the inner ring in the case of arrangement) is not bound.
[0008]
In this way, one end or both ends of a plurality of hollow fiber membrane bundles are integrated with an adhesive and further bundled by a bundling means. It works to prevent shaking and repeated collisions.
[0009]
In another aspect of the present invention, a plurality of hollow fiber membrane bundles are accommodated in a vertically long case housing having a liquid inlet / outlet, and the hollow fiber membrane bundle is one end of a plurality of hollow fiber membranes. Alternatively, a hollow fiber membrane module in which both ends are integrated with an adhesive, and the plurality of hollow fiber membrane bundles are housed and fixed in a reinforcing member made of a frame body arranged at one end or both end sides of the case housing. Furthermore, the present invention provides a hollow fiber membrane module in which the plurality of hollow fiber membrane bundles are bound by a binding means.
[0010]
The present invention is not limited to all the hollow fiber membrane bundles bundled by the binding means. As long as the problems of the present invention can be solved, some hollow fiber membrane bundles (for example, the hollow fiber membrane bundles are annularly multiplexed). The hollow fiber membrane bundle (located in the inner ring in the case of arrangement) is not bound.
[0011]
In this way, a plurality of hollow fiber membrane bundles are housed and fixed in the reinforcing material, and further bundled by the binding means, so that the hollow fiber membrane bundles are shaken by the liquid pressure accompanying the liquid in and out from the liquid inlet / outlet, It acts to prevent repeated collisions.
[0012]
In the invention of claim 3, in the above inventions, a plurality or all of the hollow fiber bundles bound by the binding means are further bound by the binding means. Thus, the said effect | action can be expressed more strongly by further bundling with the bundling means the plural or all the hollow fiber membrane bundles bundled by the bundling means.
[0013]
Claims 4 to 11 are inventions according to preferred embodiments of the inventions of Claims 1 and 2 for solving the problems of the present invention.
[0014]
`` Hollow fiber membrane bundle '' as used in the present invention means a bundle of a plurality of hollow fiber membranes or an aggregate of a plurality of small bundles in which a plurality of hollow fiber membranes are integrated with an adhesive, The small bundles described above may be integrated with an adhesive or may not be integrated with an adhesive. Further, the number of hollow fibers forming one hollow fiber membrane bundle is not particularly limited, and is appropriately determined in consideration of workability and the like.
[0015]
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 cross-sectional view of a hollow fiber membrane module, and FIG. 2 is a schematic partial cross-sectional view of a hollow fiber membrane module which is another embodiment. Is not a cross section, but hatching is added to clarify the distinction of each member. 3 is a plan view of the reinforcing material used in FIG. 2, and FIG. 4 is a front view of FIG. FIG. 5 is a schematic partial sectional view of a hollow fiber membrane module according to another embodiment.
[0016]
First, the hollow fiber membrane module 10 shown in FIG. 1 will be described. In the hollow fiber membrane module 10, 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.
[0017]
The upper cap 14 is provided with an upper inlet / outlet (concentrate outlet, permeate outlet, back pressure washing water supply port or raw water supply port) 14a having a flange 14b, and the lower cap 15 has a flange 15b. A lower liquid inlet / outlet (raw water supply port, concentrate outlet, permeate outlet, or counter pressure washing water supply port) 15a is provided.
[0018]
For example, a pipe 40 forming a concentrate line is connected to the upper inlet / outlet 14a. At this time, it is desirable to interpose a sealing material between the flange 14b of the upper inlet / outlet 14a and the flange 41 of the pipe 40.
[0019]
For example, a pipe 42 forming a raw water supply 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.
[0020]
A cylindrical permeated water inlet / outlet 20 (hereinafter referred to as 20 is a permeated water inlet / outlet, but is a raw water supply port or a concentrated liquid outlet) in a state of protruding outward from the side surface at the center of the side surface of the cylindrical main body 12. Can also be provided). A permeated water cap 21 having a flange 22 is attached to the opening side of the permeated water inlet / outlet 20. The permeated water cap 21 is connected to a pipe 44 that forms a permeated water line having a flange 45 at the tip thereof through a sealing material.
[0021]
The hollow fiber membrane bundle 16 is an aggregate of small bundles in which one or both ends of a plurality of hollow fiber membranes are integrated with an adhesive 18, and the small bundles are in contact with each other at their both ends. It is not integrated with the agent 18. The outermost hollow fiber membrane bundle 16 is fixed to the inner wall surface of the end portion of the cylindrical main body 12 with an adhesive 18.
[0022]
By sealing the hollow fiber membrane bundles 16 with the resin in this way, the hollow fiber membrane bundles 16 sway and collide repeatedly due to the flow accompanying the flow of liquid (for example, supply of back pressure washing water), and are damaged. It is prevented. The lower cap 15 side does not need to be resin-sealed, but from the viewpoint of making the hollow fiber membrane bundle 16 less likely to be shaken by the hydraulic pressure, it is preferable to carry out resin sealing similarly to the upper cap 14 side.
[0023]
The hollow fiber membrane bundle 16 is bundled by the bundling means 26 at the central portion in the length direction. At this time, a plurality of hollow fiber membrane bundles 16 or all the hollow fiber membrane bundles 16 can be bound by a binding means.
[0024]
The bundling means 26 can be a band-shaped member, an annular member (for example, an O-ring) or a tubular member (for example, a resin or rubber tube). Since the band-shaped member and the tubular member are wound and further tightened, the length thereof is longer than the diameter of the binding portion of the hollow fiber membrane bundle 16, and the annular member is used by inserting the hollow fiber bundle into the hole. The diameter is equal to or smaller than the diameter of the binding portion of the hollow fiber membrane bundle 16.
[0025]
The bundling portion by the bundling means 26 is adjusted so as to face the permeated water inlet / outlet 20. By binding the central portion of the hollow fiber membrane bundle 16 with such a binding means 26, the hollow fiber membrane bundles 16 are connected to each other by the liquid pressure accompanying back-and-forth of backwashing water or the like from the permeated water inlet / outlet 20 during the filtration operation. Can be prevented from being damaged by repeated collisions.
[0026]
The binding means 26 is preferably water permeable and stretchable. By having water permeability, filtration can be performed even in the bound portion, so that the effective area of the membrane is not reduced. Furthermore, by making it stretchable, for example, when the hollow fiber membrane bundle 16 is shaken by a liquid pressure such as back pressure washing water, the binding strength is such that the hollow fiber membrane bundles 16 do not repeatedly collide with each other. In addition to being able to maintain, when it shakes, it acts to absorb and suppress the shaking.
[0027]
In order to perform the above-mentioned action, the bundling means preferably has a width of 2 to 1300 mm, more preferably 5 to 100 mm, a thickness of preferably 0.1 to 30 mm, and more preferably a belt-shaped member.
[0028]
The ratio (d ₂ / d ₁ ) between the maximum diameter (d ₁ ) in the non-binding portion of the hollow fiber membrane bundle 16 and the minimum diameter (d ₂ ) in the binding portion is preferably 0.25 to 1, more preferably It is 0.50-0.90, More preferably, it is 0.75-0.85.
[0029]
When d ₂ / d ₁ is within the above range, the above-described action by the bundling means 26 can be enhanced, and an excessive pressure is applied to the hollow fiber membrane in the bundling portion by moderate bundling force. There is no.
[0030]
Further, the bundling means 26 is water permeable and stretchable, and the diameter of the bundling portion of the hollow fiber membrane bundle 16 has a diameter corresponding to the change in hydraulic pressure that occurs when the hollow fiber membrane module 10 is operated. It is desirable that it can be increased up to 110%, more preferably up to 120%, and even more preferably up to 150%.
[0031]
By using the bundling means 26 having such properties, the hollow fiber membrane bundles 16 do not repeatedly collide with each other even when the hollow fiber membrane bundles 16 are shaken by a liquid pressure such as backwash water during filtration operation. In addition to being able to maintain a certain degree of binding strength, it acts to absorb and suppress shaking when shaken.
[0032]
In the hollow fiber membrane module 10, the ratio (D ₁ / D) between the inner diameter (D) of the cylindrical main body 12 and the outer diameter (D ₁ ) of one hollow fiber membrane included in the hollow fiber membrane bundle 16 is Preferably it is 1/125 to 1/900, More preferably, it is 1/200 to 1/700, More preferably, it is 1/300 to 1/500.
[0033]
In the hollow fiber membrane module 10, the ratio (D ₂ / D) between the inner diameter (D) of the cylindrical main body 12 and the outer diameter (D ₂ ) of the entire hollow fiber membrane bundle is preferably 0.78 to 0.00. 96, more preferably 0.80 to 0.94, still more preferably 0.85 to 0.92.
[0034]
By setting the D ₁ / D ratio or the D ₂ / D ratio in the above range, the filling rate (accommodation number) of hollow fiber membranes per unit area can be increased, and as a result, the effective membrane area is increased. Therefore, the filtration performance of the hollow fiber membrane module can be improved.
[0035]
In the hollow fiber membrane module 10 shown in FIG. 1, when the back pressure washing water is supplied from the permeated water inlet / outlet 20 during the filtration operation, liquid pressure is applied to the hollow fiber membrane bundle 16. Since both ends are fixed with resin and the central portion is further bound by the binding means 26, even when the fluid pressure is applied, the vibration of the hollow fiber membrane bundle 16 is reduced, and the hollow fiber membrane bundles 16 are Can be prevented from being damaged by repeated collisions.
[0036]
Next, the hollow fiber membrane module 100 shown in FIG. 2 will be described. Since the hollow fiber membrane module 100 is the same as the hollow fiber membrane module 10 except that the reinforcing material 50 is used, the same parts are denoted by the same reference numerals and description thereof is omitted.
[0037]
In the opening portions at both ends of the cylindrical main body 12, the hollow fiber membrane bundle reinforcing material 50 is disposed on the upper cap 14 and lower cap 15 side. The hollow fiber membrane bundle reinforcing material 50 is bonded and fixed to the inner peripheral surface of the cylindrical main body 12 .
[0038]
The 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, and the plurality of partition plates 52 are provided between the annular outer frame 51 and the base point portion 53 at the center. Are connected. The reinforcing material 50 is preferably made of a fiber reinforced resin in order to be lightweight and have high strength.
[0039]
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.
[0040]
The ratio (A ₂ / A ₁ ) of the total occupied area A ₂ of the fan-shaped holes a to h to the area A ₁ in the annular outer frame 51 is preferably 65% or more, more preferably 70% or more, and still more preferably 80%. That's it. By setting the ratio to 65% or more, the filling rate (accommodation number) of hollow fiber membrane bundles per unit area can be increased, and as a result, the effective membrane area can be increased. The filtration performance can be improved. A ₂ is a value obtained by subtracting the area of the partition plate 52 from A ₁ .
[0041]
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.
[0042]
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.
[0043]
In the fan holes a to h of the reinforcing material 50 for the hollow fiber membrane bundle, the upper end portion or the lower end portion of the hollow fiber membrane bundle 16 is inserted, and the hollow fiber membranes constituting the hollow fiber membrane bundle 16 and the hollow fiber membranes. The bundle 16, the annular outer frame 51, and the partition plate 52 are fixedly integrated with each other with resin (adhesive). The reinforcing member 50 on the lower cap 14 side may be disposed as necessary.
[0044]
By using such a reinforcing material 50 in combination, the hollow fiber membrane bundle 16 can be easily supported and fixed, and the hollow fiber membrane bundles 16 are shaken and collided with each other by the flow of liquid such as backwash water. It is prevented from being repeatedly damaged.
[0045]
Next, the hollow fiber membrane module 200 shown in FIG. 5 will be described. Since the hollow fiber membrane module 100 is the same as the middle yarn membrane module 10 except that the form of the binding means is different, the same parts are denoted by the same reference numerals and description thereof is omitted.
[0046]
In the case shown in FIG. 5, the entire hollow fiber membrane bundle 16 is covered with a single binding means 226.
[0047]
The binding means 226 is a cylindrical member that is permeable and stretchable (however, the diameter is equal to or less than the diameter of the hollow fiber membrane bundle 16 and the length is the same as the length of the hollow fiber membrane bundle), or a belt-like member (However, the width is larger than the diameter of the hollow fiber membrane bundle and the length is about the same as the length of the hollow fiber membrane bundle). When a band-like member is used as the bundling means 226, the mating portions are bonded.
[0048]
The bundling means 226 is integrated with the hollow fiber membrane bundle 16 at both ends in the length direction at the portion of the adhesive 18. By being integrated with the hollow fiber membrane bundle 16 in this way, it is possible to prevent the bundling means 226 from peeling off or falling off.
[0049]
1, 2, and 5, each hollow fiber membrane module includes a whole hollow fiber membrane bundle 1 such as a belt-like member, an annular member (for example, an O-ring), or a tubular member (for example, a resin or rubber tube). Bundling can also be performed by two bundling means.
[0050]
【Example】
Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited to these examples.
[0051]
Example 1
In producing the hollow fiber membrane module 100 as shown in FIG. 5, the following members were used. The reinforcing material is shown in FIGS.
[0052]
(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. 14a is a concentrate outlet and 15a is a raw water supply port.
[0053]
The permeated water inlet / outlet 20 was provided with an opening diameter of 300 mm at the center position in the length direction of the cylindrical main body 12.
[0054]
(Reinforcing material 50)
The width (W ₁ ) of the annular outer frame 51 is 12 mm, the thickness (T ₁ ) is 50 mm, the width (W ₂ ) of the partition plate 52 is 10 mm, and the thickness (T ₂ ) is 50 mm.
The area (A ₁ ) in the annular outer frame 51 is 158.963 mm ²
The total occupied area (A ₂ ) of the sectors a to h is 120,000 mm ²
A ₂ / A ₁ = 0.75
(Hollow fiber membrane bundle)
A cellulose acetate-based hollow fiber membrane having an inner diameter of 0.8 mm, an outer diameter of 1.3 mm (D ₁ ), and a length of 1110 mm was used, and 2050 bundles were bundled.
[0055]
D ₁ /D=1.3/450
Using each of the above members, a hollow fiber membrane module was produced as follows. Insert the hollow fiber membrane bundle into the netron light packaging “HR3L White 70” (made of bag-shaped net) made by Dainippon Plastic Co., Ltd., and cover the 1060mm long part including the central part. Was fixed with an adhesive. A total of 24 bundles were produced in the same manner.
[0056]
Three bundles are inserted into each of the fan-shaped holes a to h of the reinforcing member 50 and positioned on both ends of the cylindrical main body 12 by a centrifugal sealer (a horizontal centrifugal molding machine manufactured by Toho Machine Industry Co., Ltd.). The hollow fiber membrane bundles and the hollow fiber membrane bundle and the inner peripheral surface of the annular outer frame 51 of the reinforcing member 50 were bonded and sealed with a urethane-based adhesive. The thickness of the adhesive (the length of one end of the hollow fiber membrane fixed and integrated with the adhesive) was 50 mm (100 mm at both ends), and the effective membrane area was 120 m ² .
[0057]
Furthermore, the total diameter (D ₂ ) of the total 24 bundles of hollow fiber membranes is about 390 mm (D ₂ /D=390/450=0.87). A flexible polyvinyl chloride tube was wound and bound to obtain a hollow fiber membrane module.
[0058]
In this hollow fiber membrane module, since the center part in the length direction of each hollow fiber membrane bundle is bound by the binding means, and the entire hollow fiber membrane bundle is bound by one binding means, The hollow fiber membrane bundle does not move even when liquid pressure is applied due to the entry and exit of the liquid (particularly the supply of back pressure wash water from the permeate inlet / outlet 20), and the hollow fiber membrane bundle is hollow for a long period (one year). The yarn membrane was not damaged and stable operation was possible.
[0059]
Example 2
A hollow fiber membrane module was obtained in the same manner as in Example 1 except that an O-ring (wire diameter 2.62 mm, ID 72.70) manufactured by Mitsubishi Electric Corporation was used as a binding means for the hollow fiber membrane bundle.
[0060]
In this hollow fiber membrane module, since the center part in the length direction of each hollow fiber membrane bundle is bound by the binding means, and the entire hollow fiber membrane bundle is bound by one binding means, The hollow fiber membrane bundle does not move even when liquid pressure is applied due to the entry and exit of the liquid (particularly the supply of back pressure wash water from the permeate inlet / outlet 20), and the hollow fiber membrane bundle is hollow for a long period (one year). The yarn membrane was not damaged and stable operation was possible.
[0061]
【The invention's effect】
In the hollow fiber membrane module of the present invention, one or both ends of the hollow fiber membrane bundle are fixed with a resin or a reinforcing material and a resin, and are further bound by a binding means. It is prevented that they collide with each other and are damaged. For this reason, stable filtration operation can be performed for a long time.
[Brief description of the drawings]
FIG. 1 is a schematic partial cross-sectional view of a hollow fiber membrane module.
FIG. 2 is a schematic partial cross-sectional view of a hollow fiber membrane module according to another embodiment.
FIG. 3 is a plan view of a reinforcing material for a hollow fiber membrane bundle.
4 is a front view of FIG. 3. FIG.
FIG. 5 is a schematic partial cross-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 Sealing resin 20 Permeated water inlet / outlet 26 Binding means 50 Reinforcing material

Claims (10)

A hollow fiber in which a plurality of hollow fiber membrane bundles are accommodated in a vertically long case housing having a liquid inlet / outlet, and one or both ends of the hollow fiber membrane bundles are integrated with an adhesive. A membrane module,
The plurality of hollow fiber membrane bundles are bundled by winding a band-like member or tubular member as a bundling means and further tightening, or by being inserted into a hole of an annular member as a bundling means. And
The hollow fiber membrane module, wherein the liquid inlet / outlet is provided at a central portion in the length direction of the side surface of the case housing or in the vicinity thereof, and the binding portion of the hollow fiber membrane bundle is adjusted to a position facing the liquid inlet / outlet . A hollow fiber in which a plurality of hollow fiber membrane bundles are accommodated in a vertically long case housing having a liquid inlet / outlet, and one or both ends of the hollow fiber membrane bundles are integrated with an adhesive. A membrane module,
The plurality of hollow fiber membrane bundles are bound by a binding means ,
The hollow fiber membrane module in which the liquid inlet / outlet is provided in the lengthwise central portion of the side surface of the case housing or in the vicinity thereof, and the binding portion of the hollow fiber membrane bundle is adjusted only at a position facing the liquid inlet / outlet. . The hollow fiber membrane module according to claim 1 or 2, wherein a plurality or all of the plurality of hollow fiber membrane bundles wrapped in a bag-like net are further bound by a binding means. The hollow fiber membrane module according to any one of claims 1 to 3, wherein the plurality of hollow fiber membrane bundles are housed and fixed in a reinforcing member made of a frame disposed on one end or both ends of the case housing. The ratio (d ₂ / d ₁ ) between the maximum diameter (d ₁ ) in the non-binding portion of the hollow fiber membrane bundle and the minimum diameter (d ₂ ) in the binding portion is 0.25 to 1. The hollow fiber membrane module of any one.   The hollow fiber membrane module according to any one of claims 1 to 5, wherein the binding means is water permeable and has elasticity.   The bundling means is water permeable and stretchable, and the diameter at the bundling portion of the hollow fiber membrane bundle increases to a maximum of 110% in response to the change in hydraulic pressure that occurs when operating the hollow fiber membrane module. The hollow fiber membrane module according to any one of claims 1 to 6.   The hollow fiber membrane module according to any one of claims 1 to 7, wherein the binding means is a belt-like member, an annular member or a tubular member having a width of 2 to 1300 mm and a thickness of 0.1 to 30 mm. The ratio (D ₁ / D) between the inner diameter (D) of the case housing and the outer diameter (D ₁ ) of one hollow fiber membrane included in the hollow fiber membrane bundle is 1/125 to 1/900. the hollow fiber membrane module as claimed in any one of 1-8. The inner diameter of the case housing (D), any one of claims 1 to 9 ratio of the hollow fiber membrane bundle entire outer diameter _{(D 2) (D 2 /} D) is 0.78 to 0.96 Hollow fiber membrane module.

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