JPS5844007B2 - Impurity removal method and device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION 4 (The invention provides a method for converting raw water such as primary cooling water of a nuclear reactor, condensate water for reactor water supply, nuclear fuel cooling pool water, and low conductivity waste liquid for waste treatment system equipment into 1 - Concerning a method and device for removing fines that facilitate the removal of solid impurities, ionic impurities, and ion exchange removal through a layer of material δ4, Conventional 0. ) In the impurity removal equipment of type C, the flow of raw water in the impurity removal equipment has many turbulences such as drifting and vortices, and the powdered resin (
For example, ion exchange (Kaneda) etc. are not uniformly converted to Brico 1, and some parts are not converted to Brico 1 at all, or the precoat is conical (').

In this state, impurities in the liquid that should be captured, such as extra-suspended (crud) and ion components, are not captured efficiently, resulting in deterioration of the quality of the treated water, and crud passing through the filter element and entering the reactor water. Otherwise, the powdered resin and the like will not be used effectively, which is disadvantageous in terms of operating life and economics, and the amount of solid waste will also increase.

Furthermore, due to the turbulent flow of the raw water, the adhesion of the pre-coat material was poor, and the average upward flow velocity of the raw water was limited to dust at a maximum of 0.1 m 2 /SeC, making it difficult to improve the processing capacity.

In order to solve these problems, the inventors conducted repeated research and created the invention related to Japanese Patent Application No. 1983-43734, which has already been filed.

The above-mentioned problems have been solved by the present invention, and in a precoat material holder in which a cylindrical perforated plate is surrounded by a tube of wire mesh, and the precoat material is adhered to this wire mesh,
If the mesh size of the wire mesh is small (large openings), the fringe of the pre-coated material (ion exchange powder resin, etc.) may easily collapse, leaking into the clean water and causing deterioration of the quality of the clean water. In addition, if the mesh size is increased to avoid this, the wire mesh may be severely damaged or the current may become low, and if backwashing is performed many times over a long period of time, pressure fluctuations may be repeated, leading to damage to the wire mesh or other problems. There was.

The present invention is constructed by stacking annular thin plates each having a concave portion on the surface and forming a communicating channel between each thin plate, and the population width of the communicating channel in the overlapping direction is set to 11 to 30 it rn. The above problems are solved by forming a pre-coating material layer on the pre-coating material holder and treating raw water.
The object of the present invention is to provide a method and device for removing impurities that can prevent leakage of precoat material, reduce resistance during backwashing, increase strength, and extend life.

The present invention provides at least -j1. 'li
A precoat material support is constructed by stacking thin flow path plates having 1 through holes so that the through holes are aligned at the same position to form a hollow flow path that penetrates in the axial direction. A communication channel that communicates the outside with the hollow channel is formed between the channel plates Ml' and l, and the outside of the communication channel ↑
[II] Forming a layer of precoat material in the openings of the precoat material support configured such that the opening width in the overlapping direction of the openings is 1 to 30 μm, and passing raw water from the outside to the inside of the precoat material layer. The present invention provides an impurity removal method and an apparatus for the same, characterized in that at least impurities in raw water are removed.

The present invention will be described with reference to the drawings in accordance with the embodiments. In FIGS. 1, 2, and 3, a raw water outlet 2 and a drain outlet [TI 3] are provided at the bottom of the container 1 of the impurity removal device.
A clean water outlet 4 is provided at the top, and a large number of precoat material supports 5 are arranged vertically in the middle part to form a group of precoat material supports.

In the -F section of the precoat material support group, three dispersion plates γ, 8, 9 each having a large number of small holes between it and the raw water population 2 are provided.

A drain pipe 10 is provided passing through the distribution plate 7°8.9.

All of the raw water passes through distribution plates 7, 8.9.

11 is a valve, 12 is an air hole, and 13 is a nozzle.

As shown in FIG. 3, the drain pipe 10 is provided with small holes 14 and 15 for drainage in the pipe wall between the dispersion plates 7 and 8, 8 and 9, and also on the lower end plate 16. A small hole 17 for drainage is provided.

The details of the precoat material support 5 are shown in FIGS. 4 and 5.
As shown in the figure, a large number of annular thin flow passage plates 18 or a plurality of flow passage plates 18 are stacked one on top of the other, and are fitted into a central porous cylinder 19 guided by guide protrusions 21.

28 is a small hole, and the pore size is 20 to 30.

A spacer 20 is attached to each predetermined number of channel plates 18.

Each channel plate 18 is provided with a protrusion 22 on its front surface having a height varying from 11 to 30 μm.

In other words, the area other than this protrusion 22 is 11 to 30 μm.
The recess 23 has a depth of approximately

The recess 23 is formed by electrolytic processing, chemical etching, or the like.

The back surface is a flat surface.

If such channel plates 18 are stacked with the front and back sides in the same direction, as shown in FIG. 6, the outer edge will be 2
4 and the inner edge 25 are formed.

As shown by the arrow 27 in FIG. 4, this communication flow path 26 is a flow path including a straight path that communicates the outside of the precoat material support 5 with the hollow flow path 29. Therefore, the direction from the outside toward the center is It is in clear line of sight and there are no obstructions in the line of sight.

That is, when fluid flows toward the center through this communication flow path 26, the fluid resistance is configured to be as small as possible.

Preferably, the area of the recess 23 is two-thirds or more of the area of the channel plate 18.

Each channel plate 18 has a through hole in the center with the inner edge 25 as the edge, and by passing the perforated cylinder 19 through it, these through holes are aligned in the same position in the axial direction to form a hollow flow passing through the axial direction. In addition to forming a channel 29 through which clean water can pass, its upper end extends through and is attached to a bulkhead 30 (FIG. 1);
The lower end is fitted with a nut 31 (Fig. 1) and a number of channel plates 1 are attached.
8.

A communication channel 26 is opened on the surface of the precoat material support 5 laminated in this way, and the width in the stacking direction is 11 to 30 mm.
An inlet aperture 32 of .mu.m is formed.

To explain how it works, for example, primary cooling water for a nuclear reactor is introduced as raw water, and in order to remove insoluble impurities (crud) contained therein and to perform ion exchange, a precoat material is first added. The support 5 is precoated with a precoat material such as powdered resin.

During precoating, raw water containing powdered resin flows in from the raw water source 2, passes through a dispersion plate 7°8.9, is rectified, and reaches the precoat material support 5.

The powdered resin forms a bridge at the inlet opening 32 with a width b, and the powdered resin is precoated on the surface of the precoated material support 5, and only clean water that has been filtered and ion-exchanged by this precoated material layer is purified. It passes through the communication channel 26, toward the center, passes through the small hole 28, and enters the hollow channel 2.
9, flows upward and flows out from the clean water outlet 4.

By repeating this operation, the outer surface of the precoat material support 5 is uniformly precoated with a prescribed amount of powdered resin, and the impurity removal performance can be improved.

After uniform precoating, the normal water flow step begins.

Here, the distribution plate 9 serves as a pressure reservoir and has a hole porosity of approximately 2 to 5, and the distribution plate 8 has a hole porosity of approximately 20 to 5.
Section 30, the perforation rate of the dispersion plate 7 is about 30 to 40%,
The role of the distribution plates 8, 7 is to equalize the flow velocity and evenly distribute the flow.

Further, the distance between each of the dispersion plates 7, 8, and 9 is at least 10 d, where d is the hole diameter.

The flow of well-dispersed raw water reaches the outer surface of the precoated material support 5, and the precoated resin layer performs impurity removal functions such as filtration and ion exchange.

At this time, the inlet opening 32 is narrow, and since the edge of the inlet opening 32 is made of a metal plate, it is more rigid than a wire mesh or the like and is not easily deformed, so a bridge of resin powder is formed firmly. , 8.9, the raw water flow is dispersed and there is little turbulence, so there is less chance of stimulating the precoat layer and breaking the bridge, and the impurity removal rate can be more than doubled, greatly improving the processing capacity. I can do it.

Depending on the flow rate of water flowing into the impurity removal device, it is possible to use two dispersion plates.

When the powder resin precoated on the outer surface of the precoat material support 5 reaches saturation, air is forced into the air hole 12 and drained from the nozzle 13 to lower the liquid level to the position of the nozzle 13.

When the air pressure inside the container reaches a certain pressure, the valve 11 is opened.

Since the rapid flow passes through the precoat material support 5, the powdered resin precoated on its outer surface is separated, backwashed, and transferred to the backwash receiving tank through the drain outlet 3.

During backwashing, high-pressure water is ejected at a considerable speed, applying considerable force, but unlike weak structures such as wire mesh, it has great rigidity and strength, so it can sufficiently resist the force during backwashing. I can do it.

Therefore, it can withstand many times of backwashing, has a narrow width of the inlet opening 32, forms a strong precoat layer, and has excellent impurity removal performance.

The width b1 of the communication channel 26 is not necessarily limited to the width b1 of the communication channel 26.
The widths of 2 do not have to be equal, but in order to minimize the resistance during normal operation or backwashing, minimize any interfering unevenness, create a visible communication channel 26, avoid the flow from bending, and adjust the channel cross section. It is also preferable to make it wider.

The area of the recess 23 is two-thirds or more of the channel plate, preferably 5
It is desirable that the width b1 be 4/4 or more, and the width b1 may be made wider than the width b1 in order to reduce the flow path resistance.

When draining, most of the slurry passes through the drain pipe 10 because the losses in the dispersion plates 7, 8.9 and the drain pipe 10 are different, but the slurry that passes through the dispersion plates 7, 8.9 is completely drained. It may take some time for it to come out, or it may not come out completely.

In order to eliminate this problem, each dispersion plate 7,
Small holes 14, 15 between 8 and 9 and at the bottom part
, 17°.

The diameter of the hole is almost the same as that of the holes in dispersion plates 7 and 8.9, and the open area ratio is 1.
It is desirable that each hole in each stage is 10% or less of the cross-sectional area of the drain pipe 10.

If complete drainage is not possible, the saturated powder resin will remain in the impurity removal device, and this powder resin will be pre-coated on the filter element during the next pre-coat, resulting in deterioration of the filtration and ion exchange performance, or There are ways to prevent this.

The shape of the protrusion 22 or the recess 23 of the channel plate 18 can be selected from various shapes, some examples of which are shown in FIGS. 7a to 7e.

The outer edge 24 and the inner edge 25 are limited to a circular shape, a square shape, or any other arbitrary shape.

FIG. 8 shows another embodiment in which the hollow channel 29 or the channel plate 1
This is an example of one provided at a position other than the center of 8.

The one shown in Figure a has a hollow flow path 29 formed around a central column 33.

In the same figure, a through hole is provided in each petal-shaped piece of the flow path plate 18, and by aligning the positions of the through holes in each flow path plate 18, a hollow flow path 29 is formed in each petal-shaped piece. The surface area to which the precoat material is attached is the dog.

34 is a bolt hole.

The actions of the precoat material include removal of solid impurities by mechanical f, i f filtration, desalination by ion exchange, pure water production, dealkalization, water softening, organic matter removal, oxygen removal, etc., or a combination thereof. act.

In the above embodiments, a vertical type is shown, but a horizontal type or an inclined type is also applicable.

The present invention prevents leakage of the precoat material, improves strength and rigidity, withstands high pressure during backwashing, eliminates the risk of damage, has low fluid resistance during normal operation and backwashing, and has a long service life. It is possible to provide an impurity removal method that is long and can increase processing capacity, and an apparatus therefor, which is extremely effective in practical terms.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a vertical cross-sectional front view;
Figure 2 is a cross-sectional plan view taken along the line 1-1, Figure 3 is a longitudinal cross-sectional view of the vicinity of the drain pipe, Figure 4 is a cross-sectional view of the precoat material support, and Figure 5 is a cross-sectional view taken along the ■-■ line. Figures 6 and 6 are enlarged views of part A in Figure 5, Figures 7a, f, and e are plan views of different embodiments of the channel plate, and Figures 8a and b are different examples of the channel plate. FIG. 3 is a plan view of the embodiment. DESCRIPTION OF SYMBOLS 1... Container, 2... Raw water population, 3... Drain outlet 1.4... Clean water outlet, 5... Precoat material support, 7... Dispersion plate, 8... Dispersion Board, 9...Distribution board,
10...Drain pipe, 11...Valve, 12...Air hole,
13... Nozzle, 14... Small hole, 15... Small hole,
16... End plate, 17... Small hole, 18... Channel plate,
19... Porous cylinder, 20... Spacer, 21...
Guide protrusion, 22... protrusion, 23... recess, 24...
・Outer edge, 25... Inner edge, 26... Communication channel, 27.
...Arrow, 28...Small hole, 29...Hollow channel, 30
... Bulkhead, 31... Nut, 32... Between entrances 11
33... Support, 34... Bolt hole.

Claims (1)

[Scope of Claims] 1 A plurality of thin flow path plates each having at least one through hole in a part thereof are arranged so that each through hole is aligned at the same position to form a hollow flow path that penetrates in the axial direction. The pre-coat material supports are stacked, and a communication channel communicating between the outside and the hollow channel is formed between the two adjacent flow channel plates, and the openings on the outside side of the communication channel are arranged in the overlapping direction. A layer of precoat material is formed in the opening of a precoat material support configured to have an opening width of 11 to 30 μm, and impurities in the raw water are removed by passing raw water from the outside to the inside of the precoat material layer. An impurity removal method characterized by: 2. A pre-coat material consisting of a plurality of pre-coat material supports, which are equipped with a raw water inlet and a drain outlet at one end, a clean water outlet at the other end, and are used by adhering the pre-coat material inside the middle part. In an impurity removal device equipped with a group of supports, a plurality of thin flow passage plates each having at least one through hole in a part are arranged to form a hollow flow passage through which the through holes are aligned in the same position in the axial direction. The precoat material supports are stacked to form a channel, and each of the channel plates has a concave portion on one surface that extends from the outer edge to the inner edge, and between the two stacked and adjacent channel plates. ,
The concave portion of one channel plate and the surface of the other channel plate opposite to the concave portion form a communication channel that communicates the outside of the precoat material support with the hollow channel, and The opening width in the overlapping direction of the opening on the outside side of the communication channel is 11 to 30μ
An impurity removal device characterized in that a plurality of dispersion plates covering the entire cross section of the raw water flow path are provided between the precoat material support group and the raw water inlet. 3. The device according to claim 2, wherein the communication channel includes a linear channel that communicates the outside of the precoat material support with the hollow channel inside. 4. The device according to claim 2 or 3, wherein the area of the recess is two-thirds or more of the area of the channel plate. 5. The recess is provided only on one surface of the channel plate, the other surface is a planar surface, and the surface with the recess of one of the adjacent channel plates is in contact with the other planar surface. Claim 2, which is superimposed as such,
The device according to item 3 or 4. 6. Claims 2, 3, and 4, wherein the precoat material support is arranged in a substantially vertical direction.
The device according to paragraph 5 or paragraph 5. 7. The device according to any one of claims 2 to 6, wherein the aperture ratio of each dispersion plate of the plurality of stages of dispersion plates increases as the distance from the raw water inlet increases. 8 There are three stages of the distribution plates, and the porosity of each distribution plate is about 2 to 5% at the stage closest to the raw water inlet, and about 2% at the middle stage.
8. The apparatus of claim 7, wherein the diameter is approximately 30-40 φ at the farthest stage. 9. According to any one of claims 2 to 8, the dispersion plate has a large number of small holes, and the distance between the distribution plates is 10 times or more the diameter of the small holes. device 6
．． 10. The device according to claim 6, wherein the upper end of the drain pipe connected to the drain outlet opens toward at least the first-most stage of the distribution plates. 11 A small drainage hole is provided in the pipe wall of the drainage pipe, and the drainage hole is provided in the pipe wall between at least one stage of the pipe walls between the phases of the multi-stage distribution plate. The device according to claim 10. 12. The device according to claim 11, wherein the drainage small holes have a porosity of 5 to 10 times the cross-sectional area of the drainage pipe between the pipe walls of each stage.