JPH028767B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention is a hollow fiber type membrane separation device for treating radioactive wastewater generated from nuclear power generation facilities, etc., in which a hollow fiber element in which hollow fibers are bundled is removably fixed. The present invention relates to a fixation device.

(Prior art) A partition plate is provided above the inside of the treatment tower to divide the inside of the tower into an upper chamber and a lower chamber, and the upper end plate of a hollow fiber element, which has a bundle of many hollow fibers, is attached to the partition plate to separate the hollow fibers. Fixing devices for hollow fiber elements in which the thread elements are suspended in a lower chamber are known.

For example, a female screw hole is opened in the partition plate, and the upper end plate of the hollow fiber element is screwed into the female screw hole to fix the upper end plate.

It has also been proposed to attach the upper end plate to a bowl-shaped portion provided on the partition plate by sealing or the like.

(Problems to be Solved by the Invention) In order to attach and detach the hollow fiber element from the partition plate for replacement etc., it is necessary to screw it in or turn it in the opposite direction to remove it, or to remove the sealing. , for large equipment of around 750m ³ /Hr.
Since we use 500 to 600 hollow fiber elements,
The work takes a lot of effort.

(Means for Solving the Problems) Therefore, the present invention forms an annular groove or a flange on the outer periphery of the upper end plate of the hollow fiber, and provides an engaging means that can engage with the annular groove or the flange. The means is characterized by having a handle.

(Operation) To remove the hollow fiber element from the partition plate, grasp the handle of the engagement means and pull it out. As a result, the engaging means engages with the annular groove or collar of the upper end plate of the hollow fiber element, so that the hollow fiber element is pulled out. Conversely, to fix the hollow fiber element to the partition plate, insert the hollow fiber element into the partition plate from the lower end, and finally engage the engaging means with the annular groove or flange on the upper end plate of the hollow fiber element. Hold the handle of the coupling means and attach it to the partition plate.

(Example) In the illustrated example, 1 is a processing tower, 2 is a partition plate provided at the upper part of the processing tower and divides the inside of the tower into an upper chamber 3 and a lower chamber 4, and 5 is a stage provided on the partition plate. Hole, 5'
5a is the upper part slightly larger than the outer diameter of the upper end plate, 5b is the lower part adapted to the outer diameter of the upper end plate of the hollow fiber element, 6 is an annular groove formed on the outer periphery of the upper end plate of the hollow fiber element, 7, 7 is a semicircular ring as an engagement means that fits into the upper part of the stepped hole, 8 is a radially inward claw provided on the inner periphery of the lower end of each semicircular ring, and 9 is attached to the top surface of the partition plate. A holding plate is fixed with bolts and has its lower surface abutted against the upper end of the semicircular ring, and reference numeral 10 indicates a rod-shaped handle fixed to each semicircular ring 7 in the diametrical direction.

The hollow fiber element 11 includes a large number of hollow fibers 12 spaced apart from each other, a porous protection tube 13 surrounding the outside of the hollow fibers, and the protection tube and the upper and lower ends of the hollow fibers are bonded to form a bundle of hollow fibers. It consists of an upper end plate 14 and a lower end plate 15 whose outer diameter is one size larger than that of the cylinder. Both panels 14 and 15 have a cylindrical plastic outer frame made of Noryl resin, etc., and an adhesive such as epoxy resin that is filled into this outer frame and hardened to connect the protective tube 13 and each end of the hollow fiber. In this embodiment, the turbidity of the raw water supplied into the lower chamber 4 is transferred to each hollow fiber 1.
The upper part of each hollow fiber penetrates the adhesive layer and opens on the upper surface of the upper end plate 14, and the lower end passes through each of the protective cylinders to obtain the treated water into the upper chamber 3 through the hollow interior of the hollow fibers. Like the end, it protrudes into the adhesive layer of the lower end board 15 and is closed. Note that the lower end plate 15 has hollow fibers 12...
It has vertical through holes 15' at adjacent intervals.
Below the partition plate 2 are holes whose diameter is slightly smaller than the inner diameter of the treatment tower 1 and arranged in the same manner as the stepped holes 5 of the partition plate, and each hole has a lower end plate 15 of the hollow fiber element. A holding plate 17 with short fitting tubes 16 erected thereon is suspended and fixed by stay bolts 18, and the lower end plate 15 of the hollow fiber element is fitted into each fitting tube 16. . In addition, if necessary, a porous guide tube 19 surrounding each hollow fiber element may be installed.
The upper end may be placed in contact with the lower surface of the partition plate 2, and the lower end may be fitted into the stepped upper half of the fitting tube 16.
Furthermore, a downward cylindrical portion 2 is provided on the outer periphery of the lower surface of the holding plate 17.
0, and the lower chamber 4 is provided with an air supply pipe 21 for supplying air into the interior surrounded by the cylindrical portion 20.

To fix each hollow fiber element 11 to the partition plate 2, insert the hollow fiber element from the lower end into the stepped hole 5 of the partition plate and into the guide tube 19, and insert each semicircular ring 7 into the annular groove 6 of the upper end plate. Plunge the claw 8 at the lower end to make both semicircular rings 7, 7 face each other, hold the handles 10, 10, and finally catch the lower ends of both semicircular rings on the step 5', and place the upper half of the stepped hole. 5a. In this state, the lower end plate 15 of the hollow fiber element is fitted into the fitting tube 16 of the holding plate 17. In addition, an O-ring 26 is fitted on the outer periphery of the upper end plate below the annular groove 6.
It is preferable to seal between the inner periphery of the lower half portion 5b of the stepped hole. After all the hollow fiber elements 11 are attached to the partition plate 2 in this way, the holding plate 9, which is located directly above each hollow fiber element and has a hole smaller in diameter than the upper end plate, is attached onto the partition plate with bolts 9'. installation,
The hollow fiber element 11 is fixed by bringing the lower surface of the presser plate into contact with the upper end of the semicircular ring 7. This presser plate 9
may cover the entire region of the partition plate to which the hollow fiber element is attached, or may be divided into several parts.

Further, in order to remove each hollow fiber element from the partition plate for replacement or the like, remove the holding plate, then grasp the handles 10, 10 of both semicircular rings and pull it out. As a result, the claws 8, 8 at the lower ends of both semicircular rings enter the annular groove 6 of the upper end plate of the hollow fiber element, so that the hollow fiber element is pulled out.

In this way, by grasping the handles 10, 10 of each semicircular ring, both semicircular rings are kept facing each other and the claws 8, 8 are placed in the annular groove, so that the claws do not come out of the annular groove, and both semicircular rings will not separate into pieces.

In addition, the work of installing and removing this hollow fiber from the partition plate is as follows:
If the outer edge of the partition plate is bolted between the collar on the upper surface of the lower chamber and the collar on the top wall 3' that covers the upper chamber as shown in the figure, remove the bolts and remove the top wall 3'.
This can be done by pulling out the partition plate together with the hollow fiber element and holding plate.

In order to carry out filtration, raw water is supplied into the lower chamber 4 from the bottom opening 22. As a result, the raw water flows into the through holes 15' of the lower end plate 15 inside each hollow fiber element 11.
or through the holes in the guide tube 19 and the protection tube 13,
The raw material passes through the tube wall of the hollow fiber 12, passes through the hole 9'' of the holding plate 9 from the hollow part of each hollow fiber, collects in the upper chamber 3, exits from the opening 23 at the top of the treatment tower 1, and is deposited on the outer surface of the hollow fiber. Suspended matter in the water is captured and gradually adheres to it.

When the differential pressure increases due to suspended solids adhering to the outer surface of the hollow fiber, the filtration is interrupted and cleaning is performed. There are various ways to do this, but in any case, open the valve of the exhaust pipe connected to the air outlet 24 at the top of the upper chamber, and use the air supply pipe 21 to drain the interior surrounded by the cylindrical part 20 below the holding plate 17. supply air to.

As a result, air uniformly enters the inside of each element through the through holes 15' of the lower end plate 15 of each hollow fiber element, and when it floats up as bubbles in the spaces between the hollow fibers 12, it cooperates with water to form the hollow fibers. The suspended solids attached to the outer surface are peeled off and released onto the water surface in the lower chamber, and the air is discharged through the air outlet 2.
Exhaust from 4. In this way, most of the air supplied through the air supply pipe 21 enters each hollow fiber element equally and floats through the gaps between the hollow fibers, so that suspended solids can be removed efficiently with a small amount of air. After removing the suspended matter in this way, the supply of air is stopped, and the water in the lower chamber is discharged from the port 22 as cleaning waste water together with the separated suspended matter, and then the filtration is restarted.

In order to improve the flow of water above and below the holding plate 17, it is preferable to provide a downward water passage pipe 25 on the holding plate at an interval between the fitting tubes 16. In this case, the downward length of the water pipe 25 is equal to or longer than the cylindrical portion 20 to prevent air from entering and escaping onto the holding plate during cleaning.

In addition, a hole 16' communicating with the upper surface of the lower end plate is provided around the fitting cylinder 16 into which the lower end plate 15 of the hollow fiber module is fitted, so that when cleaning waste water is drained, the fitting tube 16 is fitted with a hole 16' that communicates with the upper surface of the lower end plate. It is preferable to prevent it from remaining inside the cylinder.

Note that the method of fixing the hollow fiber element to the partition plate is not limited to the above-mentioned method using a holding plate, but may also be, for example, a method in which the upper end of a circular ring is bent into an L-shape and secured to the upper end of the partition plate.

The embodiments of the external pressure type water permeation method in which water permeates through the tube wall of the hollow fiber from the outer periphery into the hollow interior have been described above, but the fixing device of the present invention supplies raw water to the hollow interior of the hollow fiber, and Needless to say, it can also be used as is for fixing to a partition plate an internal pressure type hollow fiber element that allows water to permeate from the periphery to the outer periphery.

(Effects of the Invention) The present invention allows hollow fiber elements to be attached and detached more quickly than when attaching hollow fiber elements to one destination using a screw method, and is effective when implemented in large-scale equipment that uses a large number of hollow fiber elements. . Since each hollow fiber element can be handled by gripping the handle of the engaging means that engages the annular groove or collar of the upper end plate, loading and unloading is extremely easy.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view of the entire hollow fiber membrane separation apparatus according to an embodiment of the present invention, and FIG. 2 is an enlarged sectional view of the main parts of the same. In the figure, 1 is a treatment tower, and 2 is a partition plate. ,3
is the upper chamber, 4 is the lower chamber, 5 is the stepped hole, 5' is the step, 5a
is the upper part of the stepped hole, 6 is an annular groove on the outer periphery of the upper end plate of the hollow fiber element, 7 is a semicircular ring that is an engagement means,
8 is the claw of the semicircular ring, 10 is the handle of the semicircular ring,
Reference numeral 11 indicates a hollow fiber element, 12 indicates a hollow fiber, and 14 indicates an upper end plate of the hollow fiber element.

Claims (1)

[Scope of Claims] 1. A partition plate is provided above the inside of the treatment tower to divide the inside of the tower into an upper chamber and a lower chamber, and an upper end plate of a hollow fiber element, which is a bundle of a large number of hollow fibers, is attached to the partition plate. In a hollow fiber element fixing device for a hollow fiber membrane separator in which a hollow fiber element is suspended in a lower chamber using 1. A hollow fiber element fixing device for a hollow fiber membrane separation device, characterized in that an engaging means is provided, and the engaging means is provided with a handle. 2. The device according to claim 1, wherein the engaging means is a divisible circular ring having a radially inward claw on the inner periphery of the lower end, a hollow fiber element fixing device for a hollow fiber membrane separation device. .