JPS646912Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a porous dispersion plate for inflow liquid attached to the bottom of an ion exchange resin column.

A conventional downflow type ion exchange resin column has a structure as shown in FIGS. 1 and 2. That is, FIG. 1 is a diagram showing the structure of a resin column called a batten support system, in which the ion exchange resin 2, which is the filling of the ion exchange resin column 1, is covered with a screen 3 such as saran cloth or stainless steel mesh, and is placed between two perforated plates. 4 and fixed with a flange 5 to prevent the ion exchange resin from flowing out together with the passing liquid.

Fig. 2 shows what is called a silica support method, in which a support bed is formed by filling 300 mm to 1000 mm of fine particle size silica stone 6 under the layer of ion exchange resin 2 in the ion exchange resin column 1, and then the silica stone A perforated plate 7 is installed under the layer 6, and this perforated plate 7 is a semicircular sphere with many small holes with a diameter smaller than the grain size of the silica stone 6 to prevent the silica stone 6 from flowing out. It is a support for

The baffle plate 8 shown in FIG. 1 and the perforated plate 7 shown in FIG. It has the function of a friction plate to prevent the phenomenon of water flowing into the water.

However, the shapes and sizes of these baffle plates and perforated plates have conventionally been designed for the purpose of allowing the flow of the descending liquid to pass through the entire cross-sectional area of the ion exchange packed column as evenly as possible.

The present inventors investigated the ion exchange resin tower from a practical standpoint and discovered that these conventional buttful plates and perforated plates have defects.

In other words, when looking at the ion exchange resin column from a practical standpoint, the fluid passing through the ion exchange resin column cannot be said to be a downward flow in any case, and even when the downward flow type is the basic form of liquid flow operation, When backwashing is performed during regeneration operations, it is essential to use upward flow, albeit temporarily.

As a result of extensive research into the structure of conventional buttful plates and perforated plates from this standpoint, it has been found that conventional buttful plates and perforated plates have significant disadvantages.

It has been found that this inconvenience is particularly significant in large ion exchange resin towers, ie, large ion exchange resin towers with a diameter exceeding 1500 mm.

In other words, when liquid is supplied through the inflow pipe at the bottom of the ion exchange resin column and passed through the ion exchange resin packed bed in an upward flow, it is important to distribute the liquid that has entered the column evenly over the entire cross section of the column. It is necessary to disperse and raise the liquid, and it is necessary to prevent linear flow or one-sided flow of the liquid.

A linear flow or one-sided flow of the feed liquid not only reduces the ion exchange treatment efficiency but also causes various problems in the ion exchange treatment. Therefore, the present invention replaces the screen, perforated plate, and buttful plate of the conventional ion exchange resin column. The purpose is to improve.

Hereinafter, an example of an embodiment of the present invention will be explained according to FIGS. 3 and 4. FIG. 3 is a plan view of the porous dispersion plate of the present invention, and FIG. FIG. 2 is an explanatory longitudinal cross-sectional view showing the state in which the invented porous dispersion plate is attached.

In the figure, reference numeral 9 denotes a semispherical porous dispersion plate, which has a large number of through holes 10 that allow only liquid to pass through, and the central part thereof is a non-porous part 11, as shown in FIG. In the ion exchange resin tower 1, which has a liquid flow pipe 12 attached to the center of the bottom, the above-mentioned porous dispersion plate 9 is installed at a distance from the opening of the flow pipe 12 so as to cover this opening. .

In addition, in order to supply the liquid in an upward flow into the column from the liquid flow pipe 12 of the ion exchange resin column 1 and distribute it evenly to the ion exchange resin 2 packed in the column, the following ( ) to () are required to be adopted.

That is, () The diameter D of the porous dispersion plate 9 is set to one-quarter to one-half of the diameter of the ion-exchange resin column 1.

() Non-porous portion 11 in the center of the porous dispersion plate 9
The diameter d is set to be one-third to one-half of the diameter D of the porous dispersion plate 9.

() The radius R of the hemispherical body of the porous dispersion plate is set to one-fifth to one-half of the diameter of the ion-exchange resin column 1.

() The diameter of the through holes 10 that are uniformly opened around the periphery of the porous dispersion plate 9 is 0.1 m/sec to 0.5 as the linear velocity in the through holes of the liquid flow rate that is supplied in an upward flow.
m/sec range.

Furthermore, () A circular or polygonal baffle plate 8 having a diameter that is one-half or more of the diameter D of the porous dispersion plate 9 and smaller than that diameter is attached to the inner surface of the porous dispersion plate 9.

Ion exchange resin column 1 of the present invention as described above
When liquid is supplied into the column in an upward flow from the flow pipe 12 of the same column to the porous dispersion plate 9, the liquid first collides with the baffle plate 8 and is dispersed in a circular shape instead of flowing in a straight line. Furthermore, a large number of through holes 1 of the porous dispersion plate 9
It is possible to evenly distribute the liquid into the ion exchange resin column 1 through the ion exchange resin column 1 and flow it in an upward flow, so that the liquid uniformly contacts the ion exchange resin 2 and flows out of the column.

On the other hand, even when the liquid is supplied into the ion-exchange resin column 1 in a downward flow, the liquid can flow out of the column from the liquid flow pipe 12 through the numerous through holes 10 of the porous distribution plate 9.

[Brief explanation of the drawing]

Figures 1 and 2 are longitudinal cross-sectional explanatory diagrams showing the screen and perforated plate of a conventional ion exchange resin column, Figure 3 is a plan view of the porous dispersion plate of the present invention, and Figure 4 is a diagram showing the inside of the ion exchange resin column. FIG. 2 is an explanatory longitudinal cross-sectional view showing a state in which the porous dispersion plate of the present invention is attached to the bottom. DESCRIPTION OF SYMBOLS 1... Ion exchange resin column, 2... Ion exchange resin, 3... Screen, 4... Perforated plate, 5... Flange, 6... Silica stone, 7... Perforated plate, 8... Bumpy plate, 9... ...Porous distribution plate, 10...Through hole, 11...
...Non-porous part, 12...Flowing liquid pipe.

Claims (1)

[Scope of Claim for Utility Model Registration] A semicircle with a non-porous part in the center spaced apart from the opening of the liquid flow pipe provided at the center of the bottom of the ion exchange resin column and covering this opening. Regarding the installation of a spherical porous dispersion plate, () the diameter of the porous dispersion plate should be one-fourth to one-half of that of the ion exchange resin column; () The radius R of the hemispherical body of the porous dispersion plate is set to be one-fifth to one-half of the diameter of the ion exchange resin column, () The porous dispersion plate The diameter of the through hole is taken as the linear velocity at the through hole of the liquid flow rate supplied in the upward flow.
0.1 m/sec to 0.5 m/sec, () Attach a buttful plate having a diameter of at least one half of the diameter of the porous dispersion plate but smaller than the diameter of the porous dispersion plate to the inner surface of the porous dispersion plate. A porous dispersion plate for an ion exchange resin tower, characterized by the following.