JPS6320010A - Filter device - Google Patents

Abstract

PURPOSE:To obtain a device which has a large filtration area, is lightweight and inexpensive and permits the extension of the life by using plural pieces of ceramic filter bodies in multiple stages and providing feed liquid supply ports to spacers or packings to be provided between the respective housing cans. CONSTITUTION:The porous ceramic filter body 1 consisting of construction in which the front or rear ends of the respective through-holes of the porous ceramic body having the many through-holes in parallel are regularly and alternately hermetically sealed is provided in the housing can 15 and such can is housed into an inner cylinder 13a of a double-walled can body 13. Further, the housing cans 15 are stacked via the spacers 7 and packings 18. Part of the feed liquid to be filtered is supplied from the top part to the filter body 1 of the uppermost stage and is then supplied through feed liquid flow passages 11 and the respective feed liquid supply ports 19 into feed liquid supply chambers 36 above the respective filter bodies 1. The filtrate filtered by the respective filter bodies 1 is discharged through a filtrate discharge chamber 37, a filtrate discharge port 14 and a filtrate flow passage 12 or directly to the outside of the filter device 24.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a filtration device using a plurality of ceramic porous filters, and particularly to a filtration device using
The present invention relates to a filtration device useful for purifying water containing Q properties.

(Prior art) Conventionally, spent reactor internals (channel boxes, control rods, etc.) generated from nuclear power plants, etc., have been stored in water-filled water-filled containers. When submerging metal waste into a pool, the clarity of the pool water is essential.

Therefore, a portion of the pool water is constantly filtered and purified using a filtration device made of a sintered metal filter.

The conventionally used purification filter unit 51 has a fourth
As shown in the figure, four cylindrical sintered metal filters 52 are provided in the unit, and the outside of these filters is covered by a filter can body 53. The water stored in the pool is supplied from the upper part 54 of the filter canister 53;
The water flows from the top of each sintered metal filter 52 through the central flow path 55, flows through the sintered metal filter 52 from the inside to the outside, is filtered and purified, and is then discharged from the outlet 56.

(Problems to be Solved by the Invention) However, the above-mentioned filtration device made of a sintered metal filter has problems that it is expensive and has a short lifespan, as well as a small filtration area, a complicated structure, and a high weight. There were also serious drawbacks. As a means to solve some of these problems, for example, JP-A-56-148
It is also possible to use a filtration device made of a porous ceramic body described in Publication No. 607, but in this case, since the porous ceramic body is a ceramic, only a small one can be manufactured, and one with a large filtration area cannot be manufactured. was there.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned problems and to provide a filtration device that can extend its service life, reduce its weight, and be inexpensive.

(Means for Solving the Problems) The filtration device of the present invention has a structure in which the front end or the rear end of each through hole of a ceramic porous body having a large number of parallel through holes is regularly and alternately sealed. Ceramic porous filter body,
A storage can that has a step at the bottom for storing each ceramic porous body and a filtrate outlet on one side of the step, and an inner cylinder that is vertically divided into two sections between the inner cylinder and the outer cylinder. A double can body for liquid-tightly stacking a plurality of storage cans with a spacer and packing interposed between each storage can, and a stock solution supply port provided in the spacer or packing is provided in the double can body. The filtrate outlet of the storage can is connected to the inner cylinder through the inner cylinder of the double can body, and the filtrate outlet of the storage can is connected to the inner cylinder through the inner cylinder of the double can body. It is characterized by being connected directly to the other two divided filtrate flow paths between the outer cylinder and the outside.

(Function) With the above-described configuration, the stock solution to be filtered is filtered and purified by passing through one of the ceramic porous filters stacked in multiple stages, and is separated from the stock solution flow path in the double can body. The filtrate is supplied to the outside of the filtration device through the provided filtrate channel. At this time, since the stock solution channel and the filtrate channel in the double can are completely separated, there is no mixing of the stock solution and the filtrate, and the filtration and purification work can be performed reliably.

In addition, since we use a ceramic porous filter that is lightweight and cheaper than sintered metal, the filtration device can be made inexpensive and lightweight, and multiple ceramic porous filters can be stacked in parallel. Since the filtration device is formed by using multiple filters, the filtration area can be made extremely large.

(Example) First, a ceramic porous filter used in the present invention will be described. FIGS. 1(a), 1(b), and 1(C) are a side view and a vertical cross-sectional view, respectively, of the inlet side schematically showing an example of a ceramic porous filter used in the present invention. In FIG. 1, a ceramic porous filter l is made of alumina, mullite, silica, cordierite, etc., and has a large number of through holes 2 arranged in parallel.

Each through-hole 2 has its entrance side sealed with a ceramic material 3 at the front or rear end, as shown in FIG. In (b), when the stock solution to be filtered is supplied from the inlet end 4 as shown by the arrow, after the stock solution is filtered through the ceramic porous thin wall 5, the filtrate is passed through the open outlet end 6. It is discharged from the hole.

FIG. 1(C) shows an example of a shape different from that in FIG. 1(a), in which the front end of one through hole of the ceramic porous body and the rear end of the through holes surrounding the through hole are regularly alternated. It has a sealed structure, and its function is the same as described above.

FIG. 2 is a longitudinal sectional view showing an embodiment of the filtering device 24 of the present invention. In this embodiment, the five ceramic porous filters 1 are divided into two approximately equally in the vertical direction between the inner tube 13a and the outer tube 13b to form the stock solution flow path 11 and the filtrate flow path 12 on the opposite side. An inner cylinder 1 in a double can body 13 preferably made of metal.
It is stored in 3a. When stored, each ceramic porous filter 1 is placed in a storage can 15 having a step A at the bottom and a filtrate outlet 14 communicating with the filtrate channel 12 on one side of the step A.
A protective packing 16 is provided inside the storage can 15, and the storage can 15 is surrounded by a spacer 17 and a packing 18 made of an elastic member.
are stacked through. A stock solution supply port 19 communicating with the stock solution flow path 11 is provided on one side of the spacer 17 . At this time, it is preferable to have a stock solution supply chamber 36 in communication with the stock solution flow path 11 above each ceramic filter body 1, and to provide a filtrate discharge chamber 37 in the storage can below the filter body 1. Note that only the lowermost storage can 15 has a filtrate outlet 38 provided in the stepped portion A directly connected to the outside. Furthermore, an O-ring 20 is provided between the bottom of the storage cans 15 and the spacer 17 to seal between the inner cylinder of the double can body 13 and the storage cans 15 when stacking them. A screw 21 is provided on the outer periphery of the lower part of the double can body 13, and is engaged with a filter holder i23 having a hole 22 for discharging filtrate in the center to fix the five ceramic porous filter bodies 1. It constitutes a filtering device 24.

In the filtration device 24 of the present invention described above, the stock solution to be filtered flows along the flow path indicated by the arrow in FIG. That is, a part of the stock solution is supplied from the top to the ceramic porous filter 1 at the uppermost stage, and is also supplied to the stock solution supply chamber 36 at the top of each ceramic porous filter 1 via the stock solution flow path 11 and each stock solution supply port 19.
is supplied to The filtrate filtered by each ceramic porous filter body 1 is discharged from the filtrate discharge chamber 37 through the filtrate discharge port 14 and the filtrate channel 12 or directly to the outside of the filtration device 24 .

The filtrate filtered through the lowest ceramic porous filter body 1 is discharged from the filtrate outlet 38 to the outside through the holes 22.

FIG. 3 is a diagram showing one embodiment of an actual filter unit 30 using the filtration device 24 of the present invention.

As shown in FIG. 3, each of the four filtration devices 24 is attached to a unit lid 32 by a unit presser spring 31, and the outside thereof is covered by a filter can body 33 to form a filter unit 30.

When the stock solution is supplied from the inlet 34 of this filter unit 30, the filtered filtrate is discharged from the outlet 35.

Among the above-mentioned filtration devices of the present invention, a filter unit using a five-stage ceramic porous filter shown in FIG. 2 and a conventional sintered metal filter shown in FIG. 4 for comparison were fabricated. We compared and measured various performances. The results are shown in Table 1.

Table 1 As is clear from Table 1, compared to conventional filter elements using sintered metal, the ceramic porous filter of the present invention has a larger filtration area in terms of element ratio, and each filter element has four filter elements. It can be seen that the weight of the filter unit configured as an apparatus is light and the total filtration area is large, and the performance as a filter unit is significantly improved. Also, the filtration stop differential pressure is 3.5Kg/an! It has been found that it is possible to extend the lifespan until the end of life.

The present invention is not limited only to the embodiments described above, and numerous modifications and changes are possible. For example, the front end or the rear end of the ceramic porous body can be regularly and alternately hermetically sealed in different shapes other than those shown in FIGS. 1 fa) and (C).

(Effects of the Invention) As is clear from the detailed explanation above, according to the filtration device of the present invention, a plurality of ceramic filter bodies are used in multiple stages as the filter body, so that the conventional sintered metal It has a larger filtration area and is lighter than other filters.
Moreover, it is possible to obtain a filtration device which is inexpensive and whose life can be extended.

Therefore, a filter unit using this filtration device is also lightweight and inexpensive, and is particularly useful as a purification device for water contaminated with radioactivity in nuclear power plants.

[Brief explanation of drawings]

FIG. 1 (al, (bl), (C1 is a side view and vertical cross-sectional view on the population side schematically showing a ceramic porous filter body, FIG. 2 is a vertical cross-sectional view showing an embodiment of the filtration device of the present invention,
3 is a diagram showing an example of an actual filter unit using the filtration device of the present invention, and FIG. 4 is a diagram showing an example of a conventional filter unit.

Claims (1)

[Claims] 1. A ceramic porous filter having a structure in which the front end or the rear end of each through hole of a ceramic porous body having a large number of parallel through holes is regularly and alternately sealed; A storage can having a step at the bottom for storing the body and a filtrate outlet on one side of the step; 2. Stack storage cans in a liquid-tight manner with spacers and packing between each storage can.
a double can body, and the raw solution supply port provided in the spacer or packing is connected to one of the raw solution flow paths that is vertically divided into two parts between the inner cylinder and the outer cylinder through the inner cylinder of the double can body. At the same time, the filtrate outlet of the storage can is connected to the other two divided filtrate flow path between the inner cylinder and the outer cylinder through the inner cylinder of the double can body. 2. The filtration device according to claim 1, wherein the ceramic porous filter body has a structure in which the ends of every other through hole among the through holes of the ceramic porous body are alternately sealed at the front end or the rear end. . 3. The filtration device according to claim 1, wherein the ceramic porous filter body has a structure in which the front end of one through hole of the ceramic porous body and the rear end of the through hole surrounding the through hole are alternately sealed. . 4. The filtration device according to claim 1, wherein a stock solution supply chamber communicating with the stock solution flow path is provided above each ceramic porous filter, and a filtrate discharge chamber is provided in a storage can below the filter. 5. The filtration device according to claim 1, wherein the raw solution flow path and the filtrate flow path are divided into two sections facing each other between an inner cylinder and an outer cylinder so as to surround the ceramic porous filter body.