JPH022836A - Hollow thread membrane filter device - Google Patents

Abstract

PURPOSE:To reduce the manufacturing man power and to improve the back- washing efficiency of hollow thread membrane during back washing by providing a swing motion preventing mechanism preventing protection tubes receiving hollow thread membrane module structural bodies from swinging. CONSTITUTION:A harmetic vessel 1 is partitioned into a lower filtration chamber 3 and an upper treated liquid chamber 4 by a pipe plate 2. Protecting tubes 15 are hung from the pipe plate 2 in the filtration chamber 3, and the hollow thread membrane module structural body 5 hung from the pipe plate 2 is received in the protecting tube 15, and the swing motion preventing mechanism 25 preventing the protection tube 15 from swinging is provided in the lower open part of the protecting tube 15. In this swing motion preventing mechanism 25, >=2 supporting members 25a having open part per one protecting tube 15 fix the protecting tubes mutually at the lower end of the protecting tube 15. As a result, the manufacturing man power is reduced and the back washing efficiency of hollow threads during back washing is improved.

Description

Detailed Description of the Invention [Objective of the Invention] (Industrial Application Field) The present invention relates to a hollow fiber membrane filtration device that uses a hollow fiber membrane module as a filtration material, and particularly relates to a hollow fiber membrane filtration device that uses a hollow fiber membrane module as a filtration material. The present invention relates to a hollow fiber membrane filtration device that can be fixed with a filtration system to prevent the accumulation of crud, etc., reduce radiation exposure to workers, and improve backwashing efficiency.

(Prior Art) Generally, in nuclear power plants, the generation of corrosion products is suppressed and removed as a measure to reduce radioactivity. A filtration device is used to separate and remove the turbid matter.

Conventionally, this filtration device uses a pre-coated filter made of powdered ion exchange resin, filter paper, etc.
Flat membrane filters such as filter cloth and membrane filters,
Hollow tube filters made of sintered metal, ceramic, etc. have been used, but in recent years hollow fiber membrane filtration devices using hollow fiber membrane modules as filtration materials have become widespread.

This hollow fiber membrane is a membrane of hollow fibers with an outer diameter of approximately 0.3 to 3 mm and a large number of fine permeation pores, and has a particle size of 0.1
It is possible to capture @turbidity of less than μs, and it is widely used as a unit filter material in fields such as electronic industry, medicine, and wastewater treatment.

FIG. 5 is a sectional view showing an example of this hollow fiber membrane filtration device. This hollow fiber membrane filtration device is configured such that a closed container 1 is divided into a filtration chamber 3 and a processing liquid chamber 4 by a tube plate 2, and a plurality of hollow fiber membrane modules 5a are vertically installed in the filtration chamber 3 in multiple stages. ing. Each hollow fiber membrane 6 is fixed to the tube plate 2 via a module fixing part 7, and the tube plate 2 is held between outer peripheral flanges 8 and 9 attached to the edges of the body IA and lid plate IB of the closed container 1. It has been fixed.

The hollow fiber membrane module 5a generally has a module structure in which a large number of fibrous hollow fiber membranes 6 are bundled in a linear or U-shape, and the ends are fixed with resin or the like, and the part fixed with the resin or the like is the above-mentioned part. This is the module fixing part 7.

In addition, in the hollow fiber membrane filtration device shown in this example, the sixth
As shown in the figure, three stages of hollow fiber membrane modules 5a in which hollow fiber membranes 6 are bundled in a straight line and their ends are fixed are arranged in series, their module fixing parts 7 are connected with connectors 23, and their upper ends are The integrated hollow fiber membrane module structure 5 is formed by attaching the gripping tool 22 to the bottom end and connecting the closing tool 24 to the lower end, and fitting the gripping tool 22 into the mounting hole drilled in the tube plate 2. Together, the hollow fiber membrane module structure 5 is fixed.

Here, the connector 23 has the function of interconnecting the hollow fiber membrane modules 5a and communicating the water collection pipe 11 disposed at the center of the hollow fiber membrane module 5a over the entire length of the structure 5.

The hollow fiber membrane module structure 5 is housed in a cylindrical protection tube 15 fixed to the lower surface of the tube plate 2 and suspended within the filtration chamber 3, as shown in FIG.

At a predetermined position in the axial direction of the protection tube 15, that is, at a portion facing the module fixing part 7 of the accommodated hollow fiber membrane module structure 5, the side wall of the protection tube 15 is inwardly recessed as shown in FIG. , a plurality of protrusions 19 are formed in the circumferential direction. The protrusions 19 suppress vibrations of the hollow fiber membrane module structure 5 during filtration operations and backwashing operations by suppressing and fixing the module fixing portion 7.

Further, a rectifying tube bundle 20 is provided at the lowermost end of the protective tube 15. As shown in FIG. 8, this rectifier tube bundle 20 is a bundle of a large number of short rectifier tubes 21 with their center axes parallel to each other, and is attached to the lowermost end of the protection tube 15.

This rectifying tube bundle 20 acts as a rectifying mechanism for uniformly causing the supply liquid introduced from the supply liquid inlet nozzle 10 provided at the bottom of the filtration chamber 3 to flow into each protection cylinder 15.

The waste liquid generated from the nuclear power plant is introduced into the filtration chamber 3 from the supply liquid inlet nozzle 10, and when passing through the surface of each hollow fiber membrane 6, foreign substances such as crud are separated and removed and filtered. The processed liquid passes through the hollow part of the hollow fiber membrane 6 and flows into the water collecting pipe 11 provided at the center of the bundle of hollow fiber membrane modules 5, and then flows into the processing liquid chamber 4 via the tube plate 2. .

It passes through the processing liquid outlet nozzle 12 and is transferred to the outside of the system.

By the way, 1. Usually after a predetermined volume of feed liquid is filtered.

An air layer 13 is formed above the filtration chamber 3. This air layer I3 is formed by minute air bubbles in the water, air bubbles attached to the inner surface of piping or the surface of equipment, etc. that gradually accumulate in the upper part due to long-term operation. At this time, a valve (not shown) downstream of the nozzle of the vent 14 was opened to discharge air together with the supply liquid to the waste treatment system.

This vent 14 is also used for backwashing operations to remove crud, etc. adhering to the surface of the hollow fiber membrane 6 when the permeation pressure loss increases due to clogging of the hollow fiber membrane 6.

During backwashing operation, backwashing air is introduced from the air inlet nozzle 16 disposed at the bottom of the filtration chamber 3, air is ejected as bubbles from the air blowing pipe 17, and the impact force of the rising bubbles causes the hollow fiber membrane module 5a to The hollow fiber membrane 6 is vibrated, and the cladding etc. attached to the surface of the hollow fiber membrane are peeled off and fallen off, thereby regenerating the filtration function of the hollow fiber membrane. The backwash water subjected to backwashing is transferred to the wastewater treatment facility from a backwash water outlet nozzle 18 provided at the bottom of the filtration chamber 3.

(Problem to be Solved by the Invention) However, in the conventional hollow fiber membrane filtration device, the protection tube 15 is not fixed, but is only hung from the tube plate 2, and the protection tube 15 and the tube plate 2 are The mounting part is made strong, which results in poor workability and requires a large amount of manufacturing man-hours. Also, when fixing the protection tube 15, make holes in the plate the same number as the protection tubes 15, pass the protection tube 15 through the holes, and fix the protection tube 15.
A hooking mechanism such as a notch or a hook is attached to the lower end of the protection tube 15 in advance, and the protection tube 15 is fixed in place.

However, these methods increase the number of parts, require a great deal of labor for manufacturing, processing and assembly, and increase the weight of the device.

In addition, since the lower end of the protective tube 15 fixed by the fixing plate 26 etc. has a complicated shape, crud etc. tend to accumulate during backwashing, resulting in an increase in radiation exposure6. Air blowing pipe 1 installed at the bottom of the protective tube 15 during washing
The hollow fiber membrane module 5a is vibrated, and the crud and the like deposited on the surface of the hollow fiber membrane 6 are caused to fall due to the impact of the bubbles. However, at this time, since the lowermost end of the protection tube 15 is not fixed, air bubbles from the air blowing pipe 17 do not enter the protection tube 15 evenly.
There was a problem in that the vibration width of the surface of the hollow fiber membrane 6 was small and the backwashing action did not proceed effectively.

The present invention has been made to solve the above problems, and the lower end of the protective tube is fixed with a hollow support member, thereby reducing the number of manufacturing steps and improving the backwashing rate of the hollow fiber membrane during backwashing. The purpose of the present invention is to provide a hollow fiber membrane filtration device that has the following features.

[Structure of the invention]

(Means for Solving the Problems) The present invention includes a tube plate that partitions the inside of a closed container into a lower filtration chamber and an upper processing liquid chamber, a protection cylinder that is suspended from the tube plate into the filtration chamber, In a hollow fiber membrane filtration device having a hollow fiber membrane module structure housed in a protection tube and suspended from a nine-tube plate, a swing prevention mechanism for preventing swinging of the protection tube is installed at the lower end opening of the protection tube. It is characterized by the fact that it is provided in

(Function) According to the hollow fiber membrane filtration device configured as described above, the attachment of the protection tube and the tube plate becomes easy, and when the protection tube is fixed, the accumulation of crud, etc. at the bottom end of the protection tube is prevented, thereby reducing the radiation exposure of workers. The amount can be significantly reduced.

In addition, since the lower end of the protective cylinder is fixed and does not move, the backwashing air bubbles during backwashing enter each protective cylinder evenly, and the crud that has accumulated on the membrane surface of every hollow fiber membrane module is evenly peeled off. , it is possible to perform effective backwashing without uneven backwashing.

(Example) An example of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a sectional view showing an embodiment of the hollow fiber membrane filtration device according to the present invention, and the same components as those of the conventional example shown in FIG. do.

In FIG. 1, a closed container 1 is divided by a tube plate 2 into a lower filtration chamber 3 and an upper processing liquid chamber 4. The upper end of the protection W115 is fixed to the lower surface of the tube plate 2, and the protection tube 15
is suspended in the filtration chamber 3.

The hollow fiber membrane module structure 5 is accommodated in the protection tube 15 , and a module fixing portion 7 at the upper end of the hollow fiber membrane module structure 5 is fitted and fixed into a mounting hole provided in the tube plate 2 .

The protection tube 15 is formed of a straight pipe material with protrusions formed on the side wall surface, and a swing prevention @@25 for preventing the protection tube 15 from swinging is provided at the lowermost end thereof.

The details of the rocking prevention mechanism 25 are as shown in FIG.
and is fixed to the adjacent protection tube 15 by welding, adhesion, pressure bonding, or the like.

In addition, to simplify the drawing, the rectifier tube bundle 20 in the protective WJls
is omitted.

The restraining support member 25a is hollow and prevents crud and the like from accumulating on the upper part of the restraining support member 25a during backwashing.

An example of the restraining support member 25a has a length of 10~?
A thin pipe material with a thickness of 0 nm and a thickness of 1.511 m is used. The outer diameter of this pipe material is the outer diameter of the protective cylinder 15 and the arrangement pitch of the hollow fiber membrane module structure 5, that is,
It varies depending on the arrangement pitch of the protective tubes 15. Regardless of the outer diameter and arrangement pitch, it is necessary to select a pipe outer diameter that fits well with the gap between each protection tube 15.

Next, the effect of this will be explained.

The liquid to be treated is introduced from the lower end of the protective tube 15 as shown by the thick arrow, passes through the rectifier tube bundle 20 and reaches the hollow fiber membrane 6, and the treated water that has been filtered on the surface of the hollow fiber membrane 6 is introduced as shown by the thin arrow. Hollow thread II! 6, passes through the module fixing part 7 and is collected in the center of the module 5 by a closure similar to the closure 24 previously shown in FIG.
The water rises up the water collection pipe 11 and flows into the processing liquid chamber 4 .

During backwashing, backwashing air bubbles are introduced into the opening at the lower end of the protection tube 15, but since the protection tube 15 is fixed at its lower end, the position of the lower end is prevented from changing in the radial direction. Therefore, during backwashing, the backwashing air bubbles from the air blowing pipe 17 enter the protective tube 15 evenly, and only the hollow fiber membrane 6 vibrates greatly due to the backwashing bubbles, removing crud, etc. that has adhered and accumulated on the membrane surface. It can be effectively removed and the backwashing efficiency can be improved.

Protective tube 1 is secured by a fixed plate with perforations such as a conventional circular plate.
5. Compared to fixing the lower end, the shape is simpler, so
In addition to significantly reducing manufacturing man-hours, the accumulation of crud, etc. on the fixed plate is prevented, and the amount of radiation exposure of workers can be significantly reduced.

Next, another embodiment of the present invention will be described with reference to FIG. In order to simplify the drawing, the rectifier tube bundle 20 in the protection tube 15 is omitted.6 The protection tube rocking prevention mechanism used in the hollow fiber membrane filtration device according to this embodiment is
A hollow triangular prism 25b is arranged in the gap between each protection cylinder 1.
It is fixed at 5.

Next, still another embodiment of the present invention will be described with reference to FIG.

The rocking prevention mechanism used in the hollow fiber membrane filtration device according to this embodiment is applicable not only to the multistage hollow fiber membrane filtration device as shown in FIG. It can also be used in a type of hollow fiber membrane filtration device in which the section is only on the side of the tube plate 2.

〔Effect of the invention〕

As explained above, according to the hollow fiber membrane filtration device according to the present invention, a hollow support member is arranged at the lower end of the protection tube and is fixed at multiple locations on the outer circumference of the protection tube, so that it is easier to use than the conventional fixing method. The structure has been simplified, and the number of parts and manufacturing man-hours have been significantly reduced. In addition, the accumulation of crud on the protective cylinder fixing part has been prevented, and the amount of radiation exposure for workers has been significantly reduced.

In addition, during backwashing, since the lower end of the protection cylinder is fixed, backwashing air bubbles enter the protection cylinder evenly, and only the hollow fiber membrane vibrates greatly due to the backwashing air.

It becomes possible to effectively remove crud, etc. attached to the membrane surface, and the backwashing efficiency can be greatly improved.

[Brief explanation of the drawing]

Fig. 1 is an enlarged cross-sectional view of a main part of an embodiment of the present invention shown along the line ■-■ in Fig. 2, and Fig. 2 is a hollow fiber membrane filtration to which Fig. 1 is applied. FIG. 3 is a sectional view showing an enlarged main part of another embodiment of the present invention; FIG. 4 is another example of a hollow fiber membrane filtration device to which FIG. 1 is applied. , FIG. 5 is a sectional view showing a conventional hollow fiber membrane filtration device, FIG. 6 is a sectional view showing the hollow fiber membrane module structure of FIG. 5, and FIG. 8 is a cross-sectional view taken along the line ■--■ in FIG. 5. FIG. 1... Airtight container 2... Tube plate 3... Filtration chamber 4... Processing liquid chamber 5... Hollow fiber membrane module structure 15... Protection tube 25... Rocking prevention mechanism 2
5a, 25b...Supporting member agent Patent attorney Rule Ken Chika Yudo Ken Daishimaru Figure 5 Figure 5

Claims (1)

[Scope of Claims] 1. A tube plate that divides the inside of the closed container into a lower filtration chamber and an upper processing liquid chamber, a protection tube that hangs down from the tube plate into the filtration chamber, and an inside of the protection tube. In the hollow fiber membrane filtration device, the hollow fiber membrane module structure is housed in a hollow fiber membrane module structure that is suspended from the tube plate, and a swing prevention mechanism that prevents the protection tube from swinging is provided at the lower end opening of the protection tube. A hollow fiber membrane filtration device characterized by: 2. The rocking prevention mechanism is characterized in that a support member having two or more openings per one protection tube is mutually fixed to the protection tube at the lower end of the protection tube. The hollow fiber membrane filtration device according to item 1.