JPS6362505A - Hollow yarn membrane filter - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] (Objective of the invention) (Industrial application field) The present invention is used for radioactive waste liquid treatment in nuclear power plants and reprocessing plants, or condensate purification in nuclear power plants and thermal power plants. This invention relates to a hollow fiber membrane filtration device.

(Prior Art) In general, in nuclear power plants, generation of corrosion products is suppressed and removed as radiation reduction measures. For example, a hollow fiber membrane filtration device is used to separate and remove suspended matter present in radioactive waste liquid generated in a nuclear power generation blunt or in condensate water of a nuclear reactor condensate system.

A conventional hollow fiber membrane filtration system 5A is constructed as shown in FIGS. 19 to 28. That is, the hollow fiber membrane filtration apparatus includes a closed container 1, and the closed container 1 is constructed by covering the upper opening of a container body 2 with a lid plate 4 via a partition plate 3.

The partition plate 3 divides the inside of the sealed container 1 into a filtration chamber 5 and a processing chamber 6, and a plurality of filter elements 7 are removably installed vertically on the partition plate 3. 7 is pressed and fixed by a fixing plate 8. A cylindrical protection tube 9 is attached to the partition plate 3 surrounding the filter element 7.

A waste liquid supply pipe 10 is connected to the lower end of the container body 2,
A concentrated waste liquid discharge pipe 11 is connected to this waste liquid supply pipe 10 . On the other hand, a processing liquid discharge pipe 12 is connected to the upper end of the lid plate 4 of the closed container 1, and an overflow pipe 13 is connected to the side surface of the closed container 1.

A bubbling pipe 14 is provided at the bottom of the container body 2, and this bubbling pipe 14 is provided with a plurality of bubble holes 15.

The bubbling pipe 14 is connected to an air supply pipe 16, and air supplied from the air supply pipe 16 is used for bubbling.

The filter element 7 consists of a hollow fiber membrane module 18 having a hollow fiber membrane filter 17, and there are various filter elements 7 as shown in FIGS. 20 to 23. In this explanation, for example, a hollow fiber membrane module 18 shown in FIG. 22 is constructed in multiple stages as shown in FIG. 23.

In the hollow fiber membrane module 18, a large number of hollow fibers 17a (only two are shown in the figure for explanation) are bundled to form a bundle of hollow fibers 17a, that is, a hollow fiber membrane filter 17, and this hollow fiber membrane Both ends of the filter 17 are bound together by a single resin binding member, and a concentration tube 20 supported by this binding member 19 is disposed in the center.

The hollow fiber membrane modules 18 having a multi-stage structure are connected to each other by a connecting tube 21, while the binding member 19 of the hollow fiber membrane module 18 at the uppermost stage is formed as a supporting member with a stepped structure, and the hollow fiber membrane module 18 at the lowermost stage A self-cap 22 is attached to the holder.

Conventionally, the above-described filter element 7 is detachably fixed to the partition plate 3 as shown in FIGS. 24 and 25. That is, at J3 in FIG. 24, the uppermost hollow fiber membrane module 1B of the filter element 7 is supported by the partition plate 3 by the flange 23a of the support member 23, and the holding flange 24a and the hanging flange 24b are supported by the support member 23. The hanger 24 is fixed, and the grip part 25 is attached from the upper part.
a ((i) The fixed fixture 25 is screwed onto the partition plate 3 and fixed by pressure (see Japanese Utility Model Publication No. 144903/1983)
.

In addition, instead of pressing and fixing with the fixing tool 25 in FIG. 25, fixing plates 26 are arranged in an equilateral triangle as shown in FIG. It is fixed (see Japanese Unexamined Patent Publication No. 145380/1983).

When actually filtering waste liquid using the hollow fiber membrane filtration device, the waste liquid is supplied into the container body 2 from the waste liquid supply piping 10 . The supplied waste liquid is filtered by the hollow fiber membrane filter 17 of each hollow fiber membrane module 18, and guided from the filtration chamber 5 to the processing chamber 6 through each hollow fiber membrane module 18. The processing liquid guided into the processing chamber 6 is sent to the outside from the processing liquid discharge pipe 12.

If the filtration action by the hollow fiber membrane filter 17 continues, the filter'A function will gradually deteriorate, so backwashing is performed periodically. During this backwashing operation, pressurized gas is supplied from the processing liquid discharge pipe 12 to the processing chamber 6 inside the closed container 1. This pressurized gas pressurizes the inside of the processing chamber 6, and this pressurization applies pressure from the inner periphery of the hollow fibers 17a, thereby removing suspended matter adhering to the outer periphery.

At the same time, bubbles are generated from the bubbling tube 14,
The air bubbles cause the hollow fibers 17a to vibrate, thereby smoothly removing suspended matter such as crud.

Through this backwashing action, the filter function of the hollow fiber membrane filter 17 of each hollow fiber membrane module 18 is restored, while the concentrated waste liquid is discharged from the concentrated waste liquid discharge pipe 11.

By repeating such filtration and backwashing, the micropores on the surface of the hollow fibers 17a gradually become clogged, and it becomes difficult to recover by backwashing. Therefore, it is necessary to replace the filter element 7 regularly. In addition, even if no clogging occurs, the hollow fiber membrane filter 17 deteriorates over time.
It is necessary to replace it at intervals of ~3 years.

When replacing the filter element 7, after removing the lid plate 4 from the container body 2, remove the fixture 25, the fixing plate 26, etc., and then use a crane or hoist as shown in FIGS. 27 and 28. to lower the hanging jig 28,
The hanging flange 24b of the hanging jig 24 is hooked onto the hook 29 of the hanging jig 28 to lift it up.

(Problems to be solved by the invention) First, a hollow fiber membrane filtration device for purifying condensate in a nuclear or thermal power plant has a sealed container with a diameter of about 2 to 3 meters, and is loaded into the main body of the container. The number of filter elements is as high as 130 to 180. For this reason, it takes a lot of time and effort to attach and remove fixtures and the like when replacing the filter element.

Particularly in the case of nuclear power plants, radioactive substances in the water adhere to the surface of hollow fiber membrane filters, resulting in high radiation doses during replacement, and there was a need to shorten the replacement time from the perspective of negative radiation exposure during work. .

Furthermore, since there are a large number of fixtures, etc., it is difficult to secure each fixture etc. with a constant pressure.

Second, conventionally, when replacing a filter element, the filter element was pulled out by hooking the hanging flange of the hanging jig from the outside using a hanging jig, as shown in FIGS. 27 and 28. At this time, it was necessary to ensure a certain interval 1 to prevent the claws of the hanging jig from coming into contact with the hanging flanges of adjacent hanging tools.

For this reason, the arrangement pitch P between the filter elements has become larger than necessary, and the diameter of the sealed container has also had to be increased. Therefore, it is economically unfavorable, and it has been desired to downsize the entire device.

A third problem is that the upper part of the surrounding hollow fiber membrane filter may become dirty during replacement work. The upper part of the hollow fiber membrane filter is the outlet for the processing liquid and must be kept clean. If there is fine dust, scum, bacteria, etc. on the top, it will get into the hollow fibers during backwashing and cannot be easily removed.

This causes a decrease in filtration performance and backwashing performance, which in turn shortens the life of the hollow fiber membrane filter.

In order to prevent this, a rubber plug or the like has conventionally been installed at the processing liquid outlet, but this has been problematic because it is not airtight enough and can easily come off.

The present invention has been made in consideration of the above-mentioned circumstances, and allows filter elements to be replaced easily and in a short time, and the pitch between each filter element can be reduced to reduce the size of the entire device. Another object of the present invention is to provide a hollow fiber membrane filtration device in which a blind cap with good airtightness and difficult to come off can be installed at the treated liquid outlet of the hollow fiber membrane filter.

[Structure of the invention]

(Means for Solving the Problems) A hollow fiber membrane filtration device according to the present invention has a large number of filter elements removably installed vertically on a horizontal partition plate that partitions the inside of a closed container into a filtration chamber and a processing chamber. In a hollow fiber membrane filtration device in which the filter element has a hollow fiber membrane filter, the upper end of the filter element has a binding part for bundling the hollow fiber membrane filters, a support part for suspending and supporting the filter element, and an inner peripheral wall formed on the upper end of the filter element. A bundling support member is provided with a hanging part that can be engaged with the hanging jig, and each filter element is supported by pressing and fixing the bundling support member from above with a presser plate common to the partition plate. The hanging part is configured such that an old cap can be hung thereon.

(Function) Since a plurality of filter elements are fixed by one holding plate, a large number of filter elements can be replaced by using only one holding plate 11.

This makes replacement work easier and reduces work time.

Also, one presser plate can be used to hold multiple filters.
In order to fix the filter, each filter is pressed with a substantially uniform EE force.

Since the inner circumferential wall of the binding support member at the upper end of the filter element is provided with a hanging portion that can be engaged with a hanging jig, there is no interference with adjacent filter elements even when the filter element is pulled out with a hanging jig or the like.

Since the suspension cap is configured to be able to be installed on the hanging portion, it is possible to prevent dirt and the like from entering the hollow fiber membrane filter.

(Example) An example of a hollow fiber membrane filtration device according to the present invention will be described with reference to FIGS. 1 to 5. Regarding the overall structure, see the first section.
As shown in the figure, it is not different from the conventional device shown in FIG. 19, so a description thereof will be omitted.

In this embodiment, as shown in FIGS. 2 and 3, all the filter elements 7 are pressed and fixed by, for example, one holding plate 35.

The filter element 7 is supported on the partition plate 3 by a sleeve-shaped flanged binding support member 36. The binding support member 36 has a support flange 37 formed on the outer periphery of the sleeve, and this support flange 37 is supported in the stepped support hole 3a of the partition plate 3. Further, a female thread 38 is provided as a hanging portion on the upper part of the inner circumferential wall of the binding support member 36.

When replacing this filter element 7, as shown in FIG.
9 is screwed into the female thread 38.

Furthermore, a blind cap 40 can be screwed into this female thread 38, as shown in FIG.

In this embodiment, all the filter elements 7 are fixed by one holding plate 35, so that all the filter elements 7 can be replaced by simply attaching and detaching one holding plate 35. Further, since the binding support member 36 does not protrude above the presser plate 35, workability is improved.

Therefore, the replacement work of the filter element 7 becomes easy and the work time is shortened.

Since the internal thread 3B is provided on the inner circumferential wall of the binding support member 36, there is no interference with other filter elements 7 when the filter element 7 is pulled out using the hanging jig 39.

Therefore, the pitch P between each filter element 7 can be reduced and the filter elements 7 can be arranged densely, and the entire device can be downsized.

Since the blind cap 40 can be screwed onto the female thread 38 of the binding support member 36, it is possible to prevent dirt and the like from entering the hollow fiber membrane filter 17 even during replacement work. Therefore, deterioration in filtration performance and backwashing performance can be prevented, and shortening of the life of the hollow fiber membrane filter 17 can be prevented.

Next, other embodiments will be described with reference to FIGS. 6 to 18.

In this embodiment, as shown in FIG. 6, all the filter elements 7 are fixed by one holding plate 35, similar to the previous embodiment. The binding support member 36 of the filter element 7 is constructed by integrally fixing a binding part element 42 and a supporting hanging part element 43. The support suspension element 43 includes a support flange 44 as an outer peripheral flange.

Further, the supporting hanging element 43 has an inner peripheral flange as a hanging part, that is, a hanging flange 45 at the upper part of the inner peripheral wall, and notches 46 are formed in two places in this hanging flange 45 (see FIG. 7). .

When replacing such filter element 7,
Proceed as shown.

That is, 211X as shown in FIGS. 9 and 10
Lower the hanging jig 48 that has passed through the protrusion 47 of J, insert the protrusion 47 into the notch 46 of the hanging flange 45 (see Figure 11), rotate it 90 degrees, and pull the protrusion 47 onto the hanging flange 45. Hang it (see Figure 12) and pull it out.

Further, another method of replacing such a filter element 7 is shown in FIG. According to this method, the notch 46
There is no need to provide a hanging jig 51 having two or more movable claws 50 as shown in FIG.
(see figure) After inserting into the processing liquid outlet (see figure 15),
The hanging flange 45 of the supporting hanging part element 43 is hooked by the claw 50 (see FIG. 16) and lifted up rt3.

When installing the blind cap 52 at the processing liquid outlet of the support suspension element 43, as shown in FIG. Insert it, rotate it 90rfi, and install it.

Regarding the suspension flange 45 and cutout 46 of this embodiment, as shown in FIG.
Various modifications are conceivable, such as one in which a groove 55 is provided in the circumferential direction on the inner circumferential wall of the groove 55 and two iHMs (not shown) are provided from this groove 55 to the upper end of the supporting suspension element 54.

According to the above embodiment, it becomes easy to attach and remove the hanging jigs 48 and 51, and in particular, if the latter hanging jig 51 is used, remote control of the replacement work becomes possible.

Other effects similar to those of the embodiment described above are obtained.

In the embodiment described above, all the filter elements are fixed by one holding plate, but the present invention is not limited to this, and may be fixed by two or three or more holding plates.

〔Effect of the invention〕

In the hollow fiber membrane filtration device according to the present invention, a plurality of filter elements are fixed by one holding plate, so that a large number of filter elements can be replaced by simply attaching and detaching one holding plate. Therefore, replacement work becomes easy and work time is shortened.

Therefore, when the present invention is applied to an atomic couplant, the radiation exposure of workers can be reduced.

Furthermore, by fixing a plurality of filter elements with one holding plate, each filter element can be fixed with a substantially constant pressure.

Since the inner circumferential wall of the bundling support member is provided with a use portion that can be engaged with a hanging jig, there is no interference with adjacent filter elements even when the filter element is pulled up with a hanging jig or the like.

Therefore, the spacing between each filter element can be reduced, and the overall device can be downsized, which improves flow performance.

Furthermore, since the self-cap can be installed on the hanging part, it prevents dirt from entering the hollow fiber membrane filter, prevents deterioration of filtration performance and backwashing performance, and extends the life of the hollow fiber FA filter. There is an effect.

[Brief explanation of the drawing]

Fig. 1 is an overall configuration diagram of an actual droplet example of the present invention, Fig. 2 is an enlarged view of the main part of the above actual flow example, Fig. 3 is a plan view of the main part of the above actual example, and Fig. 4 is a diagram showing the above implementation. FIG. 5 is a diagram showing a method of lifting a filter element according to an example, FIG. 5 is a diagram showing a blind cap installed on the hanging part of the above embodiment, FIG. 6 is an enlarged view of main parts of another embodiment of the present invention, and FIG. A plan view of the filter element of the above embodiment, FIG. 8 is a diagram showing a method of lifting the filter element of the above embodiment, FIGS. 9 and 10 are diagrams showing a lifting jig used for lifting the filter element of FIG. 8, Figure 11 and 1
2 is a diagram showing a method of attaching the lifting jig shown in FIG. 8 to the hanging part, FIG. A diagram showing how to attach the hanging jig shown in the figure to the hanging part,
Fig. 17 is a diagram showing a blind cap installed on the hanging part of the above embodiment, Fig. 18 is a diagram showing a modification of the above embodiment, Fig. 19 is an overall configuration diagram of a conventional device, Figs. 20 and 21 , 12th
Refer to the figures and Fig. 23 is a diagram without showing the types of filter elements, Fig. 24 is an enlarged view of the main parts of a conventional device, Fig. 25 is an enlarged view of the main parts of another conventional device, and Fig. 26 is an enlarged view of the main parts of the conventional device. Plan view,
FIG. 27 is a diagram showing a method of hoisting the filter element of the conventional device, and FIG. 28 is a diagram showing a method for lifting the filter element of the conventional device f. DESCRIPTION OF SYMBOLS 1... Sealed container, 2... Container body, 3... Partition plate, 4... Lid plate, 7... Filter element, 17.
... Hollow fiber membrane filter, 18 ... Hollow fiber membrane module, 35 ... Pressing plate, 36 ... Binding support member, 37.
...Support flange, 38...Female thread, 40...Blind cap, 42...Ending part element, 43...Hanging part element for support, 44...Support flange, 45...
...Hanging flange, 46...notch. Applicant's representative Hisashi Hatano 3rd meeting Figure 6 Figure 7 Figure 74 Ditch 15 Figure /σ Session 77 Figure 6 Figure 22 Figure 23

Claims (1)

[Claims] 1. A large number of filter elements are removably installed vertically on a horizontal partition plate that partitions the inside of the closed container into a filtration chamber and a processing chamber, and the filter elements are hollow fibers having a hollow fiber membrane filter. In the membrane filtration device, the upper end of the filter element includes a binding part for bundling the hollow fiber membrane filters, a support part for suspending and supporting the filter element, and a hanging part formed on the inner peripheral wall and capable of engaging with a hanging jig. A binding support member is provided, and each filter element is supported by pressing and fixing the binding support member from above with a presser plate common to the partition plate, while a blind cap is configured to be removably attached to the hanging portion. A hollow fiber membrane filtration device characterized by: 2. The bundling support member is integrally molded into a sleeve shape, the filter element is supported by the partition plate by its outer flange, and a hanging jig or blind cap can be screwed into the female thread provided on the inner peripheral wall of the bundling support member. A hollow fiber membrane filtration device according to claim 1. 3. The binding support member is integrally formed with a binding element and a support suspension element with inner and outer peripheral flanges. The hollow fiber membrane filtration device according to claim 1, wherein at least two cuts are formed in the peripheral flange, and a hanging jig or a blind cap can be engaged with the inner peripheral flange.