JP2004230215A - Ion exchange resin filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ion exchange resin-packed filter constituted so that an ion exchange resin-packed state is maintained when water is made to pass through this filter and the ion exchange resin is effectively prevented from being damaged when the water impregnated in the ion exchange resin is frozen at a sub-zero temperature. <P>SOLUTION: A movable partition plate 9 constituting a pressing unit 6 is made to press the ion exchange resin 2 to the side of a water-permeable plate 4 disposed on the side of a discharge port 1b of this filter by the pressing force of an elastic body 5 so as to keep the resin 2 in a packed state when water is made to pass through this filter at normal temperature. When water 11 enclosed in a space between another movable partition plate 8 and a fixed partition plate 7 is frozen and swollen to push down the plates 8, 9 and a connection part 7 to the inflow side of this filter against the elastic force of the body 5, a gap is created between them and the adjacent resins 2, and thus the damage to the resin 2 is prevented. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an ion exchange resin filter in which an ion exchange resin for capturing ions in running water is pressed and fixed, and more particularly to a technique for preventing damage to the ion exchange resin due to freezing.
[0002]
[Prior art]
The ion exchange resin filter is a filter in which a granular ion exchange resin is packed in a column, and captures and removes ions in running water by an exchange reaction on the surface of the ion exchange resin. Many of such ion exchange resin filters have a vertical configuration. In the vertical type ion exchange resin filter, the filling state of the ion exchange resin is maintained by the action of gravity.
[0003]
However, depending on the purpose of use of the ion exchange resin filter and its installation space, the ion exchange resin filter may be forced to be of a horizontal type, in which case it is necessary to take measures to maintain the filling state of the ion exchange resin. Become. From such a viewpoint, as a horizontal type ion exchange resin filter, for example, a water permeable pack member that can block the passage of the ion exchange resin is arranged in a column, and this water permeable pack member is a coil spring that is an elastic member. A structure in which the pressure is applied toward an ion exchange resin has been proposed (for example, see Patent Document 1).
[0004]
The ion-exchange resin filter described in Patent Document 1 has a simple structure in which the water-permeable pack member is pressed toward the ion-exchange resin by a coil spring, and maintains the filled state while preventing a gap from being generated in the ion-exchange resin. And the ion exchange capacity can be prevented from lowering.
[0005]
[Patent Document 1]
JP 2001-252576 A
[Problems to be solved by the invention]
However, the ion-exchange resin filter described in Patent Document 1 has a configuration in which the ion-exchange resin is pressed by an elastic body so as not to move without a gap. When expanded, the ion exchange resin may be damaged. If the ion-exchange resin is damaged, there is a problem that the ion-exchange ability is reduced, the size of the resin is reduced, and no gap is formed, so that the pressure loss increases.
[0007]
The present invention has been proposed for the purpose of overcoming the drawbacks of the conventional structure, and can maintain the state of filling the ion-exchange resin at the time of passing water, and can maintain the ion-exchange resin even at a temperature below freezing. It is an object of the present invention to provide an ion exchange resin filter that does not cause damage to the filter.
[0008]
[Means for Solving the Problems]
The ion-exchange resin filter of the present invention is a horizontal-type ion-exchange resin filter in which a column is filled with an ion-exchange resin that captures ions in running water, and the ion-exchange resin is pressed and fixed by an elastic body and has a temperature below the freezing point. Sometimes, the pressure by the elastic body is released due to the freezing and expansion of the water sealed in the column.
[0009]
In this ion exchange resin filter, when water is passed at room temperature, the ion exchange resin is pressed and fixed by the elastic body, and a favorable filling state of the ion exchange resin is maintained. When the temperature is below the freezing point, the pressure of the elastic body is released due to the freezing and expansion of the water sealed in the column, and a gap is formed between the ion-exchange resins that have been filled without a gap when the water flows. Therefore, expansion of the volume due to freezing of the water swelling in the ion exchange resin is allowed.
[0010]
【The invention's effect】
According to the ion-exchange resin filter of the present invention, the ion-exchange resin is pressed and fixed by the elastic body to maintain a good filling state at the time of passing water at normal temperature, so that the exchange reaction on the ion-exchange resin surface proceeds appropriately. In addition, ions in running water can be reliably captured. Also, when the outside air falls below the freezing point, the pressure applied by the elastic body holding down the ion exchange resin is released, creating a gap between the ion exchange resins and freezing the water swelling in the ion exchange resin. Is allowed, the ion exchange resin is not damaged, and problems such as a decrease in ion exchange capacity and an increase in pressure loss can be solved.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of an ion exchange resin filter to which the present invention is applied will be described with reference to the drawings.
[0012]
(1st Embodiment)
The ion-exchange resin filter of the present embodiment prevents the ion-exchange resin from moving without gaps by pressing the two connected plates at the time of passing water at normal temperature, and the two connected plates at the time of stopping below freezing. The structure is such that the connected plate is pushed down to the inflow side due to the freezing and expansion of the water sealed between the inflow side and the plate provided therebetween.
[0013]
FIG. 1 shows the configuration of the ion exchange resin filter of the present embodiment. This ion-exchange resin filter is obtained by filling a column 1 with a granular ion-exchange resin 2, and has a horizontal configuration. Accordingly, the column 1 is placed horizontally, and the left side in the figure is an inlet 1a into which a stock solution to be subjected to ion removal processing by the ion exchange resin 2 flows, and the right side is an outlet 1b through which the processing solution after the ion removal processing is discharged. It is.
[0014]
The column 1 is filled with the ion-exchange resin 2, and the type of the ion-exchange resin 2 may be appropriately determined according to the type of the impurity to be removed. For example, an anion exchange resin, a cation exchange resin, and a mixed resin thereof can be used. Further, the ion exchange resin 2 to be filled can be arranged in a plurality of layers, and can be a mixed bed type structure of a plurality of types of ion exchange resins.
[0015]
Water-permeable plates 3 and 4 are provided at the end of the column 1 on the side of the inlet 1a and the end of the column 1 on the side of the outlet 1b, respectively. To prevent spills. One end of an elastic body 5 such as a spring is fixed to the water permeable plate 3 on the inflow port 1a side, and the pressing unit 6 is pressed by the elastic body 5 to displace the ion exchange resin 2 on the water outlet 1b side. It is configured to press against the plate 4 side.
[0016]
Here, the pressing unit 6 will be described in detail. The pressing unit 6 includes a fixed partition plate 7 fixed to the column 1 and two movable partition plates 8 and 9 movable in the column 1. . The two movable partition plates 8 and 9 are arranged on both sides of the fixed partition plate 7 and are connected to each other by a connecting portion 10 penetrating the fixed partition plate 7. Therefore, these two movable partition plates 8 and 9 and the connecting portion 10 move integrally in the column 1 and can move rightward in the drawing until the movable partition plate 8 comes into contact with the fixed partition plate 7. The movable partition plate 9 can be moved leftward in the figure until the movable partition plate 9 contacts the fixed partition plate 7.
[0017]
In such a pressing unit 6, the back side of the movable partition plate 8 is supported by the other end of the elastic body 5. Therefore, at the time of passing water at normal temperature, the two movable partition plates 8 and 9 and the connecting portion 10 are urged rightward in the drawing by the elastic force of the elastic body 5, and as a result, the movable partition plate 9 The ion-exchange resin 2 comes into contact with the ion-exchange resin 2 and is pressed against the water-permeable plate 4 on the discharge port 1b side.
[0018]
In addition, the volume between the movable partition plate 8 and the fixed partition plate 7 and the volume between the movable partition plate 9 and the fixed partition plate 7 complementarily to each other as the movable partition plates 8 and 9 and the connecting portion 10 move. Is formed, and water 11 is sealed in one of the spaces, specifically, the space between the movable partition plate 8 and the fixed partition plate 7. Therefore, when the enclosed water 11 freezes and expands when the temperature is below freezing, the space between the movable partition plate 8 and the fixed partition plate 7 is expanded, and the movable partition plates 8 and 9 and the connecting portion 10 are moved to the left in the figure. It is designed to move in the direction.
[0019]
In addition, since the water 11 is sealed in the space between the movable partition plate 8 and the fixed partition plate 7, the fixed partition plate 7 and the movable partition plates 8 and 9 are each formed of an impermeable plate. Further, the connecting portion 10 is also formed of a water-impermeable material. Further, in order to prevent water 11 from leaking from the space between the movable partition plate 8 and the fixed partition plate 7, an inner peripheral side of the fixed partition plate 7 and an outer peripheral side of the connecting portion 10 penetrating the fixed partition plate 7. It is preferable that an O-ring is attached to each.
[0020]
When the fixed partition plate 7 and the movable partition plates 8 and 9 are formed of a water-impermeable plate and the connecting portion 10 is also formed of a water-impermeable material as described above, the undiluted solution flowing from the inlet 1a of the column 1 (the treatment target) Water) cannot pass through the pressing unit 6, and the stock solution cannot be introduced into the space filled with the ion exchange resin 2. Therefore, in the present embodiment, the flowing water passage hole 12 is formed so as to penetrate the movable partition plates 8 and 9 and the center portion of the connecting portion 10, and the stock solution is filled with the ion exchange resin 2 through the flowing water passage hole 12. Water is passed through the space.
[0021]
In the ion-exchange resin filter having the above configuration, when the system on which the ion-exchange resin filter is mounted operates and water is passed through the ion-exchange resin filter, as shown in FIG. 8, 9 and the connecting portion 10 are urged rightward in the figure by the elastic body 5, and the movable partition plate 9 presses the ion exchange resin 2 against the water permeable plate 4 side of the outlet 1b side by the pressing force of the elastic body 5. . As a result, the ion exchange resin 2 is pressed so as not to move without a gap, and a good filling state is maintained. Therefore, the undiluted solution is not discharged as it is without ion exchange due to a gap or the like, and the ions in the running water can be reliably captured.
[0022]
On the other hand, when the system in which the ion exchange resin filter is mounted is stopped, the water in the ion exchange resin filter is usually drained by air purging. However, if the ion-exchange resin 2 is purged until it dries, the ion-exchange resin 2 may be damaged. Therefore, the ion-exchange resin 2 must be kept in a state where water is swollen to some extent. When left in such a state, when the outside air temperature falls below the freezing point and the water swollen while the ion exchange resin 2 is pressed so as not to move without a gap by the pressing force of the elastic body 5 freezes, There is a possibility that the ion-exchange resin 2 filled in the resin may be damaged. If the ion exchange resin 2 filled therein is damaged, the ion exchange capacity of the ion exchange resin filter is reduced, or the size of the ion exchange resin 2 is reduced to eliminate the gap, thereby increasing the pressure loss. There is a problem.
[0023]
In the ion exchange resin filter of the present embodiment, when the outside air temperature falls below the freezing point, the water 11 sealed in the space between the movable partition plate 8 and the fixed partition plate 7 freezes and expands, The space between the movable partition plate 8 and the fixed partition plate 7 is expanded. The pressing force of the movable partition plate 8 due to the freezing and expansion of the water 11 is much larger than the pressing force of the elastic body 5. Therefore, when the water 11 freezes and expands, as shown in FIG. 2, the movable partition plates 8 and 9 and the connecting portion 10 move leftward in the figure against the elastic force of the elastic body 5.
[0024]
That is, when the system is stopped at a temperature below the freezing point of the outside air, the water 11 sealed in the space between the movable partition plate 8 and the fixed partition plate 7 of the ion exchange resin filter freezes and expands, and the movable partition plates 8 and 9 and the connecting portion 10 are moved. It is pushed down to the inflow side against the elastic force of the elastic body 5. As a result, the ion-exchange resin 2, which has been pressed so as not to move without any gap at the time of flowing water, can move to some extent freely, and a gap is formed between the particles of the ion-exchange resin 2, and the ion-exchange resin 2 swells. Even if the frozen water expands, the volume increase can be tolerated.
[0025]
As described above, in the ion-exchange resin filter of the present embodiment, since the ion-exchange resin 2 is kept in a good filling state at the time of passing water at normal temperature, it is possible to surely capture ions in running water, Further, when the outside air falls below the freezing point, a gap is generated between the particles of the ion exchange resin 2 and the volume expansion due to the freezing of the water swelling in the ion exchange resin 2 is allowed. The exchange resin 2 is not damaged, and problems such as a decrease in ion exchange capacity and an increase in pressure loss can be solved.
[0026]
(Second embodiment)
The ion-exchange resin filter of the present embodiment prevents the ion-exchange resin from moving without gaps by pressing the ion-exchange resin with a pressing plate that is urged by an elastic body at the time of passing water at room temperature. The pressure plate is pushed down to the inflow side by the freezing and expansion of the water sealed in the piston connected to the ion exchange resin filling side of the plate.
[0027]
FIG. 3 shows a configuration of the ion exchange resin filter of the present embodiment. The basic structure of this ion exchange resin filter is the same as that of the first embodiment, and is formed by filling a column 1 with a granular ion exchange resin 2. The column 1 is placed horizontally, and the left side in the figure is an inlet 1a into which a stock solution to be subjected to the ion removal treatment by the ion exchange resin 2 flows, and the right side is an outlet 1b through which the treatment liquid after the ion removal treatment is discharged. . In addition, water-permeable plates 3 and 4 are disposed at the end of the column 1 on the side of the inlet 1a and the end of the column 1b, respectively. 2 is prevented.
[0028]
One end of an elastic body 5 such as a spring is fixed to the water permeable plate 3 on the inlet 1a side. The pressing plate 13 is pressed by the elastic body 5, and the ion exchange resin 2 is permeable to the water permeable side on the outlet 1b side. It is configured to press against the plate 4 side. The pressing plate 13 is formed of a water-permeable plate so as not to hinder water flow in the ion exchange resin filter.
[0029]
On the other hand, the surface of the pressing plate 13 opposite to the surface supported by the elastic body 5 is supported by a pair of pistons 14. These pistons 14 are composed of a cylinder part 14a and a slide part 14b. The base end of the cylinder part 14a is fixed to the water-permeable plate 4 on the discharge port 1b side, and the tip of the slide part 14b is a pressing plate. 13.
[0030]
In the pair of pistons 14, water 15 is sealed in the space of the cylinder portion 14a sealed by the slide portion 14b. When the sealed water 15 freezes and expands, the water 15 is sealed by the slide portion 14b. The space of the cylinder portion 14a to be stopped is expanded, and the pressing plate 13 is moved leftward in the drawing.
[0031]
In the ion-exchange resin filter having the above configuration, when the system on which the ion-exchange resin filter is mounted operates and water is passed through the ion-exchange resin filter, as shown in FIG. Is urged rightward in the figure by the elastic body 5, and the pressing plate 13 presses the ion exchange resin 2 against the water permeable plate 4 on the discharge port 1 b side by the pressing force of the elastic body 5. As a result, the ion exchange resin 2 is pressed so as not to move without a gap, and a good filling state is maintained. Therefore, the undiluted solution is not discharged as it is without ion exchange due to a gap or the like, and the ions in the running water can be reliably captured.
[0032]
On the other hand, when the system in which the ion exchange resin filter is mounted is stopped, the water in the ion exchange resin filter is usually drained by air purging. However, if the ion-exchange resin 2 is purged until it dries, the ion-exchange resin 2 may be damaged. Therefore, the ion-exchange resin 2 must be kept in a state where water is swollen to some extent. When left in such a state, when the outside air temperature falls below the freezing point and the water swollen while the ion exchange resin 2 is pressed by the pressing force of the elastic body 5 so as not to move without gaps freezes, There is a possibility that the ion exchange resin 2 filled inside may be damaged. If the ion exchange resin 2 filled therein is damaged, the ion exchange capacity of the ion exchange resin filter is reduced, or the size of the ion exchange resin 2 is reduced to eliminate the gap, thereby increasing the pressure loss. There is a problem.
[0033]
In the ion exchange resin filter of the present embodiment, when the outside air temperature falls below the freezing point, the water 15 sealed in the space of the cylinder portion 14a sealed by the slide portion 14b constituting the piston 14 is used. It freezes and expands, expanding the space of the cylinder portion 14a sealed by the slide portion 14b. The pressing force of the slide portion 14 b due to the freezing and expansion of the water 15 is much larger than the pressing force of the elastic body 5. Therefore, when the water 15 freezes and expands, as shown in FIG. 4, the pressing plate 13 is pressed against the elastic force of the elastic body 5 by the slide portion 14b of the piston 14, and moves leftward in the figure. .
[0034]
That is, when the system is stopped below the freezing point of the outside air, the water 15 sealed in the piston 14 of the ion exchange resin filter freezes and expands, and the pressing plate 13 is pushed down to the inflow side against the elastic force of the elastic body 5. As a result, the ion-exchange resin 2, which has been pressed so as not to move without any gap at the time of flowing water, can move to some extent freely, and a gap is formed between the particles of the ion-exchange resin 2, and the ion-exchange resin 2 swells. Even if the frozen water expands, the volume increase can be tolerated.
[0035]
As described above, also in the ion exchange resin filter of the present embodiment, since the favorable filling state of the ion exchange resin 2 is maintained at the time of passing water at normal temperature, it is possible to surely capture the ions in the running water, Further, when the outside air falls below the freezing point, a gap is generated between the particles of the ion exchange resin 2 and the volume expansion due to the freezing of the water swelling in the ion exchange resin 2 is allowed. The exchange resin 2 is not damaged, and problems such as a decrease in ion exchange capacity and an increase in pressure loss can be solved.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a configuration of an ion exchange filter according to a first embodiment.
FIG. 2 is a diagram showing a state in which a pressing force of an elastic body is released by freezing and expansion of water.
FIG. 3 is a diagram illustrating a configuration of an ion exchange filter according to a second embodiment.
FIG. 4 is a view showing a state in which a pressing force of an elastic body is released by freeze expansion of water.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Column 2 Ion exchange resin 5 Elastic body 6 Pressing unit 7 Fixed partition plate 8, 9 Movable partition plate 10 Connecting part 11 Water 12 Through hole 14 Piston 15 Water

Claims (5)

In a horizontal type ion exchange resin filter filled with columns with ion exchange resin that captures ions in running water,
While the ion exchange resin is pressed and fixed by the elastic body,
An ion-exchange resin filter characterized in that when the temperature is below freezing, the pressure exerted by the elastic body is released due to the freezing and expansion of water sealed in the column. A fixed partition plate fixed to the column, comprising two movable partition plates movable in the column,
The two movable partition plates are arranged on both sides of the fixed partition plate, and are connected to each other by a connecting portion penetrating the fixed partition plate,
One movable partition plate presses and fixes the ion exchange resin by the pressing force of the elastic body, and water is sealed in the space between the other movable partition plate and the fixed partition plate. The ion exchange resin filter according to claim 1, wherein the pressing force by the elastic body is released. The fixed partition and the movable partition are made of a water-impermeable plate,
3. The ion-exchange resin filter according to claim 2, wherein the two movable partition plates and the connecting portion are provided with flowing water passage holes passing therethrough. A pressing plate that presses the ion exchange resin by the pressing force of the elastic body, and a piston that is filled with water and is connected to the ion exchange resin filling side of the pressing plate,
The pressure plate connected to the piston is pressed down against the pressing force of the elastic body due to the freezing and expansion of the water sealed in the piston when the temperature is below freezing, and the pressing by the elastic body is released. The ion exchange resin filter according to claim 1, wherein The ion exchange resin filter according to claim 4, wherein the pressing plate is formed of a water permeable plate.

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