JP2001205263A - Double bed type ion exchange apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of parts of a double bed type ion exchange apparatus, to reduce the installation area of the apparatus to achieve space saving and to reduce the cost of the apparatus. SOLUTION: A cation exchange resin chamber 12 is formed in a resin tower 11 at the center part thereof and an anion exchange resin chamber 13 is formed around the cation exchange resin chamber 12. A raw water supply pipe 27 is connected to the cation exchange resin chamber 12 and a treated water outflow pipe 29 is connected to the anion exchange resin chamber 13 and a treated water feed pipe 28 is connected across the cation exchange resin chamber 12 and the anion exchange resin chamber 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-bed ion exchange apparatus, and more particularly, to a double-bed ion exchange apparatus in which a cation-exchange resin chamber and an anion-exchange resin chamber are installed in a single resin tower to save space. It relates to a switching device.

[0002]

2. Description of the Related Art An ion exchange apparatus is widely used as an apparatus for producing pure water by removing salts and free weak acids in raw water. A mixed bed type in which a cation exchange resin and an anion exchange resin are filled and mixed in one resin tower, and a double bed type in which those resins are filled in separate resin towers FIG. 3 shows a schematic diagram of the latter double-bed ion exchange apparatus.

As shown in FIG. 1, a double-bed ion exchange apparatus is provided with a cation resin tower 1 filled with a cation exchange resin and an anion resin tower 2 filled with an anion exchange resin, and a treatment between the two. A water supply pipe 3 is connected, and a raw water supply pipe 4 is connected to the cation resin tower 1 and an anion resin tower 2 is connected to the cation resin tower 1.
Are provided with treated water outflow pipes 5, respectively.

[0004]

The double bed type ion exchange apparatus does not cause the problem of poor separation of the ion exchange resin at the time of regeneration seen in the mixed bed type, and has an advantage that the regeneration treatment is easy. On the other hand, on the other hand, there are disadvantages that two resin towers are required and that the number of resin towers inevitably increases the number of pipes due to a plurality of resin towers, thereby increasing the apparatus cost as a whole.

[0005] In addition, since it is necessary to provide two resin towers, a large installation area is increased, and there is a problem that the apparatus cannot be installed in a place where there is not enough installation space corresponding to the increase.

The present invention has been made in view of the above points,
A double-bed ion that can reduce the number of equipment and cost by storing the cation resin tower and the anion resin tower in the same resin tower, and also can reduce the installation area of the entire equipment and save space. It is intended to provide a switching device.

[0007]

According to the present invention, there is provided (1) a double-bed ion exchange apparatus characterized in that a cation exchange resin chamber and an anion exchange resin chamber are separately provided in a resin tower; The resin tower has a first resin chamber located in the center,
The double-bed ion exchange device according to (1), further including a second resin chamber formed around the first resin chamber, (3).
The double-bed ion exchange device according to (2), wherein the first resin chamber is configured as a cation exchange resin chamber, and the second resin chamber is configured as an anion exchange resin chamber. (4) The inlet side of the cation exchange resin chamber. A raw water supply pipe, a treated water supply pipe connected between an outlet side of the cation exchange resin chamber and an inlet side of the anion exchange resin chamber, and a treated water outlet pipe provided at an outlet side of the anion exchange resin chamber. The gist is the double-bed ion exchange apparatus according to the above (1).

[0008]

FIG. 1 shows an embodiment of the present invention. A double-bed ion exchange apparatus shown in FIG. 1 has a cation exchange resin chamber 12 and an anion exchange resin chamber 13 in a resin tower 11.
Are provided separately. That is, the resin tower 11
Has a first resin chamber 14 located at the center and a second resin chamber 15 formed around the first resin chamber 14, and these resin chambers 14 and 15 are arranged as shown in FIG. Are formed concentrically with each other and are partitioned by partition walls 16. Each of the resin chambers 14 and 15 is filled with an ion exchange resin. In the present embodiment, the first resin chamber 14 is filled with a cation exchange resin, and the resin chamber 14 is configured as the cation exchange resin chamber 12. The second resin chamber 15 is filled with an anion exchange resin, and the resin chamber 15 is configured as the anion exchange resin chamber 13.

The first resin chamber 14 is connected to the anion exchange resin chamber 13
Although the second resin chamber 15 may be configured as the cation exchange resin chamber 12, the first resin chamber 14 may be configured as the cation exchange resin chamber 12 as in this embodiment, and the second resin chamber 15 may be configured as the second resin chamber. It is preferable that 15 is configured as the anion exchange resin chamber 13. This is based on the following reasons.

That is, since the cation exchange resin has about twice the ion exchange capacity of the anion exchange resin, the amount of both ion exchange resins to be filled in the resin chamber is expressed by volume ratio, that is, cation exchange resin: anion exchange resin = 1: 1. It becomes 2. Therefore, the volume of the cation exchange resin chamber is about 2 times the volume of the anion exchange resin chamber.
In this case, when two resin chambers are formed concentrically, it is advantageous in terms of manufacturing that a resin chamber having a small volume is located at the center. If a small-capacity resin chamber is positioned around the center, the thickness of the resin chamber becomes thinner, which not only causes difficulties in manufacturing, but also makes it difficult to fill the ion-exchange resin in a uniform state. is there. For this reason, it is preferable to configure the first resin chamber 14 located at the center as the cation exchange resin chamber 12.

A distributor 17 is provided above the cation exchange resin layer 22, and a collector 18 is provided below the cation exchange resin layer 22. These distributors 1
As the 7 and the collector 18, those having a known structure usually used in an ion exchange apparatus can be employed.

A distributor 19 is provided above the anion exchange resin layer 23, and a collector 20 is provided below the anion exchange resin layer 23. The distributor 19 is shown in FIG.
As shown in FIG. 2, the tube is configured as a ring-shaped tube, the inside of the tube serves as a passage for raw water, etc., and a number of holes 21 are formed in the bottom of the tube. The pores 21 have a size that does not allow the anion exchange resin to pass through. The collector 20 also has the same shape and structure as the distributor 19,
The holes 21 are formed in the upper surface of the tube.

Below the cation exchange resin layer 22 and under the anion exchange resin layer 23, a resin support layer 24 is provided in a non-fixed manner. The resin support layer 24 includes an inert resin particle layer 25 in which a large number of inert resin particles are spread, and a water-permeable sheet interposed between the cation exchange resin layer 22 or the anion exchange resin layer 23 and the inert resin particle layer 25. 26. The inert resin particles are resin particles having no ion exchange ability.
５5 mm polypropylene resin particles can be used. The water-permeable sheet 26 is made of a material that allows liquid such as raw water to pass therethrough but does not allow inert resin particles to pass through. Such materials include, for example, nonwoven fabrics. Since the resin support layer 24 is provided in a non-fixed manner in the resin chamber, the resin layers 22, 2
3 is pushed upward together with the resin layers 22 and 23 while being in contact with the lower portion of 3. Therefore, even if the resin layers 22 and 23 are pushed upward, the lower portions of the resin layers 22 and 23 are always pressed by the resin support layer 24, so that the lower portions of the resin layers 22 and 23 can be prevented from flowing, As a result, the regeneration efficiency can be improved. In addition, the collector 1 mentioned above
Reference numerals 8 and 20 are embedded in the resin support layer 24.

A raw water supply pipe 27 is connected to an inlet side of the cation exchange resin chamber 12, that is, to a distributor 17 in the cation exchange resin chamber 12. Cation exchange resin room 1
The treated water feed pipe 28 is connected between the outlet side of the second and the inlet side of the anion exchange resin chamber 13. That is, one end of the treated water pipe 28 is connected to the collector 18 in the cation exchange resin chamber 12, and the other end is connected to the distributor 19 in the anion exchange resin chamber 13. Further, the outlet side of the anion exchange resin chamber 13, that is, the anion exchange resin chamber 13
The treated water outflow pipe 29 is connected to the collector 20 inside.

In this embodiment, raw water is first passed through the cation exchange resin chamber 12 and then passed through the anion exchange resin chamber 13. However, the present invention is not limited to this. With the direction reversed, the raw water is first passed through the anion exchange resin chamber 13 and then the cation exchange resin chamber 1
It may be of a structure of a type passing through 2. In the case of adopting the latter structure, the raw water supply pipe 27 is connected to the distributor 19 in the anion exchange resin chamber 13, and the treated water supply pipe is connected between the collector 20 and the distributor 17 in the cation exchange resin chamber 12. 28, and the treated water outflow pipe 2 is connected to the collector 18 in the cation exchange resin chamber 12.
9 are connected.

The collector 18 of the cation exchange resin chamber 12
The acid regenerant supply pipe 3 is branched from the treated water supply pipe 28
0 is connected to the distributor 17, and a regeneration drain discharge pipe 31 is connected to the distributor 17 so as to branch off from the raw water supply pipe 27. Further, the collector 2 of the anion exchange resin chamber 13
0 is connected to an alkaline regenerant supply pipe 32 in a form branched from a treated water outflow pipe 29, and a distributor 19 is a regenerated wastewater discharge pipe 33 branched from a treated water supply pipe 28.
Are connected.

As described above, in the present embodiment, the structure of the countercurrent regeneration system in which the raw water flows in the downward flow and the regenerant flows in the upward flow is adopted, but the present invention is not limited to this. Instead, a structure of a countercurrent regeneration system in which raw water flows in an upward flow direction and a regenerating agent flows in a downward flow direction may be adopted. When adopting the latter structure,
For example, a raw water supply pipe 27 is connected to the collector 18, a treated water supply pipe 28 is connected between the distributor 17 and the collector 20, and a treated water outflow pipe 29 is connected to the distributor 19. Further, an acid regenerant supply pipe 30 is connected to the distributor 17, a regeneration drain discharge pipe 31 is connected to the collector 18, and the distributor 1 is connected to the distributor 18.
9 and an alkali regenerant supply pipe 32 connected to the collector 2
0 is connected to the regeneration drainage pipe 33.

However, in the present invention, from the viewpoint of increasing the purity of the treated water, it is preferable to employ a downward flow water, an upward flow regenerating water passing, and a chemical passing type structure. In this case,
When performing upward flow regeneration, the ion exchange resin layer is lifted upward, but the upward movement distance should be minimized. This is because when the resin flows along with the movement of the resin layer, the distribution state of the ions adsorbed on the resin is disturbed, and the regeneration efficiency is reduced. Therefore, it is preferable that the cation exchange resin chamber 12 and the anion exchange resin chamber 13 are filled with the cation exchange resin and the anion exchange resin, respectively, so as to be almost full, so that a slight upper space is left. In the case of such a structure, backwashing cannot be performed before the step of passing the regenerant, but the present invention does not necessarily require backwashing.

Further, the present invention is not necessarily limited to the structure of the countercurrent regeneration system, but may be the structure of the cocurrent regeneration system of the downflow water and the downflow regeneration as required. However, in order to increase the regeneration efficiency, it is preferable to adopt a counter-current regeneration structure.

In the present invention, a perforated plate may be provided in place of the resin support layer 24 composed of the inert resin layer 25 and the water-permeable sheet 26. Although not particularly shown, for example, a perforated plate obtained by winding a water-permeable filter cloth on a substrate provided with a large number of fine through-holes can be used. In short, any material may be used as long as it has a structure that allows passage of a liquid such as raw water, but does not allow passage of an ion exchange resin. In this case, the board is fixed in the resin chamber. Therefore, since only the resin layers 22 and 23 are pushed upward during the upward flowing water and the chemical passing process, there is a possibility that the lower portions of the resin layers 22 and 23 may flow. Therefore, in order to prevent fluidization of the resin layers 22 and 23, it can be said that the resin support layer 24 is more preferable than the board.

In the present invention, the room configuration of the cation exchange resin chamber and the anion exchange resin chamber is not limited to a structure in which the inside of the resin tower is concentrically defined as described above. It may be of a structure that is formed into sections.

In the present invention, the resin tower 11 constructed as described above may be connected in a plurality of stages to form a double bed type ion exchange apparatus.

The operation of the present invention will be described with reference to FIGS. 1 and 2. Raw water is introduced into the cation exchange resin chamber 12 in the resin tower 11 through the raw water supply pipe 27, and
Water is passed downflow through 7. The raw water is generally city water,
Industrial water or the like is used. Raw water is cation exchange resin layer 2
2, it is ion-exchanged into cation exchange treated water, and flows out of the treated water supply pipe 28 via the collector 18. The cation exchange treated water is led to the anion exchange resin chamber 13 through the treated water supply pipe 28, and is supplied to the distributor 1
After that, the resin flows down in the resin chamber 13 in a downward flow. Here, since the distributor 19 is formed in a ring shape, the cation exchange-treated water can flow down uniformly into the anion exchange resin chamber 13 through the holes 21.
The cation exchange treated water passes through the anion exchange resin layer 23,
Here, the ion exchange is performed, and the desalination process ends. The desalinated treated water passes through a collector 20 and a treated water outflow pipe 29
More effluent, and thus high-purity treated water (pure water) is obtained.

[0024] As the flow rate of water increases, the ion exchange capacity of the ion exchange resin gradually decreases, and the processing capacity of the ion exchange apparatus decreases. For this reason, the reproduction process is periodically performed to restore the processing capability. In the regeneration treatment, an acid regenerant is passed through the cation exchange resin, and an alkali regenerant is passed through the anion exchange resin. Generally, hydrochloric acid is used as the acid regenerating agent, and caustic soda is used as the alkali regenerating agent. The acid regenerant flows upward from the acid regenerant supply pipe 30 into the cation exchange resin chamber 12 via the collector 18 to regenerate the cation exchange resin. At this time, the cation exchange resin layer 22 is
4, the resin is pushed up in a state where the resin support layer 24 is in contact with the lower portion of the resin layer 22. Therefore, there is no possibility that fluidization of the resin will occur at the lower portion of the resin layer 22. There is no danger of lowering. The regenerated effluent after the end of the regeneration flows out of the regenerated effluent discharge pipe 31 via the distributor 17.

On the other hand, the alkali regenerant flows upward from the alkali regenerant supply pipe 32 into the anion exchange resin chamber 13 via the collector 20 to regenerate the anion exchange resin. At this time, the anion exchange resin layer 23 is
Although it is pushed upward together with 4, there is no possibility that fluidization of the resin occurs at the lower portion of the anion exchange resin layer 23 by the same action as described above. The regenerated effluent after the regeneration ends flows out of the regenerated effluent discharge pipe 33 via the distributor 19.

[0026]

According to the present invention, the double-bed ion exchange apparatus is constructed as a structure in which a cation exchange resin chamber and an anion exchange resin chamber are provided separately in a resin tower. The chamber and the anion exchange resin chamber can be housed in the same resin tower. As a result, the cation exchange resin tower and the anion exchange resin tower, which were conventionally required separately, can be configured as one resin tower. ,
The industrial value is extremely large as having both functions of two resin towers.

According to the present invention, the number of devices can be reduced, and the number of pipes can be reduced by reducing the number of devices, so that the cost can be greatly reduced as a whole. In addition, the reduction in the number of devices is advantageous in terms of maintenance.

Further, according to the present invention, the installation area of the apparatus can be reduced, so that the space can be saved, and the apparatus can be easily installed even in a place where there is not enough space.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view showing an embodiment of the present invention.

FIG. 2 is a schematic plan sectional view showing a state of the resin chamber and the distributor viewed from a plane direction in the embodiment of FIG. 1;

FIG. 3 is a schematic view showing a conventional double-bed ion exchange device.

[Explanation of symbols]

 11 resin tower 12 cation exchange resin chamber 13 anion exchange resin chamber

Claims (4)

[Claims] 1. A double-bed ion exchange apparatus characterized in that a cation exchange resin chamber and an anion exchange resin chamber are provided separately in a resin tower. 2. The double-bed ion exchange apparatus according to claim 1, wherein the resin tower includes a first resin chamber located at a central portion, and a second resin chamber formed around the first resin chamber. . 3. The double-bed ion exchange apparatus according to claim 2, wherein the first resin chamber is configured as a cation exchange resin chamber, and the second resin chamber is configured as an anion exchange resin chamber. 4. A raw water supply pipe is connected to an inlet side of the cation exchange resin chamber, and a treated water supply pipe is connected between an outlet side of the cation exchange resin chamber and an inlet side of the anion exchange resin chamber. 2. The double bed ion exchanger according to claim 1, wherein a treated water outflow pipe is provided at an outlet side of the chamber.