JPS6125645A - Method and apparatus for regenerating ion exchange resin using in mixed bed type desalting apparatus - Google Patents

Abstract

PURPOSE:To prevent previously the deterioration of desalting performance by feeding only a cation exchange resin and anion exchange resin which are obtained by removing the inactivated resin out of the ion exchange resin subjected to the regenerating treatment into the inside of a desalting tower in the prestage of raw liquid treatment. CONSTITUTION:An acid reagent is charged into the regeneration tower 8 through a reagent passing means to subject a cation resin 103 to the regenerating treatment. An alkali reagent is charged into the second regeneration tower 15 through the other reagent passing means to subject an anion resin 101 to the regenerating treatment. After the above-mentioned regenerating treatment of the cation resin 103, a stop valve 12 of a takeout pipe 11 for the cation resin is opened to take out the cation resin 103 out of the first regeneration tower 8 and the cation resin 103 is fed to a storage vessel 18 for an ion exchange resin through the take out pipe 11 and stored therein. On one hand, the anion resin 101 taken out from the second regeneration tower 15 is stored in the storage tank 18.

Description

Detailed Description of the Invention [Field of Application of the Invention] The present invention relates to a method and apparatus for regenerating ion exchange resin used in a mixed bed desalination equipment for treating turbine condensate, make-up water, etc. The present invention relates to a method and apparatus for regenerating an ion exchange resin suitable for feeding only a cation exchange resin (hereinafter referred to as cation resin) and an anion exchange resin (hereinafter referred to as anion resin) to a demineralization tower after treatment.

[Background of the invention]

FIG. 1 shows an example of a conventional mixed bed desalination apparatus.

The hotbed type desalination apparatus shown in this figure includes a desalination tower 3, a first desalination tower 3, and a first demineralization tower 3. Second regeneration towers 8 and 15 and an ion exchange resin storage tank 18 are provided.

A plurality of demineralization towers 3 are usually installed, and a stock solution transfer pipe 1 having a stop valve 2 is provided at the inlet of each demineralization tower 3, the inside is filled with an ion exchange resin layer 100, and the exit A processing liquid take-off pipe 4 equipped with a stop valve 5 is provided.

The inlet of the first regeneration tower 8 is connected to the outlet of the demineralization tower 3 through an ion exchange resin transfer pipe 6 having a stop valve 7. At the bottom of the first regeneration tower 8, there is a stop valve as a means for stirring the anion resin 101, the cation resin 103, and the inert resin 102 with a specific gravity intermediate between these ion exchange resins in the pre-drug feeding stage. A pressure water supply pipe 9 having a diameter of 10 is provided, and pressure water is supplied upward from this pressure water supply pipe 9, and the water is discharged to the upper part of the first regeneration tower 8, so that the upward water flow is is configured to form a The first regeneration tower 8 is provided with a liquid passage means (not shown), and in this example, the anion resin 1
After taking out 01, an acidic chemical is injected into the cationic resin layer through the drug passing means. moreover,
The outlet of the second regeneration tower 8 is connected to the inlet of an ion exchange resin storage tank 18 through a cation resin takeoff pipe 11 equipped with a stop valve 12 .

The inlet of the regeneration tower 15 of the ls2 is connected to the first regeneration tower 8 through an anion resin transfer pipe 13 having a stop valve 14, and the inlet of the anion resin transfer pipe 13 is connected to the regeneration tower 15 of the first regeneration qr8. After being stirred, the middle part is connected to the boundary between the divided anionic resin layer and the inert resin layer. Further, the second regeneration tower 15 is provided with a liquid passing means, through which an alkaline chemical is injected into the anion resin layer. Furthermore, the outlet of the second regeneration tower 15 is connected to a stop valve 17U.
It is connected to the inlet of an ion exchange resin storage tank 18 through a resin take-out pipe 16 .

Inside the ion exchange resin storage tank 18, the regenerated ion exchange resin layer 104 is temporarily stored. Further, a recycled ion exchange resin transfer pipe 19 having a stop valve 20 is provided at the outlet of the ion exchange resin storage tank 18, and the recycled ion exchange resin is transferred to each demineralization tower 3 through the recycled ion exchange resin transfer pipe 19. It is configured to feed and fill.

In this conventional mixed bed desalination apparatus, the desalination tower 3 is filled with an ion exchange resin layer 100, the stock solution to be treated is introduced through the stock solution transfer pipe 1, and the ion exchange resin layer 100 is filled in the desalination tower 3.
Desalting is carried out through contact with the raw solution, and the treated solution is taken out through the treated solution take-out pipe 4.

When the ion exchange resin layer 100 becomes saturated due to the desalination treatment, the ion exchange resin layer 100 is sent from the desalination tower 3 to the first regeneration tower 8 through the ion exchange resin transfer pipe 6.

Next, pressurized water is supplied upward through the pressure water supply pipe 9 as a means for stirring the ion exchange resin into the first regeneration tower 8, and the water is drawn above the first regeneration tower 8 to form an upward water flow. This upward water flow causes anionic resin 101, inert resin 102 and cationic resin 103 to form.
After this stirring, when the supply of pressure water is stopped, the cationic resin 103 and the inert resin 10 sink in order of increasing specific gravity, and are deposited in the first regeneration tower B from the bottom to the top.
A layer of 2 and anionic resin 101 is formed, and the anionic resin 101 and cationic resin 103 are separated from each other via an inert resin 102 having an intermediate specific gravity.

After the anion resin 101 and cation resin 103 are separated, the anion resin 101 is sent from the first regeneration tower 8 to the second regeneration tower 15 through the anion resin transfer pipe 13 and separated therefrom. Therefore, the inert resin 102 and the cationic resin 103 remain in the first regeneration tower 8.

Next, an acidic chemical is injected into the first regeneration tower 8 through a drug passing means to regenerate the cationic resin 103, and an alkaline chemical is injected into the second regeneration tower 15 through another drug passing means to regenerate the anionic resin. 101 is reproduced.

After the regeneration treatment, the inert resin 102 is removed from the first regeneration tower 8.
and cation resin 103 are sent to the ion exchange resin storage tank 18 through the cation resin take-out pipe 11, and the anion resin 101 is sent from the second regeneration tower 15 to the ion exchange resin storage tank 18 through the anion resin take-out pipe 16, and the inert resin 102 The recycled anion resin 101 and cation resin 103 are temporarily stored in a mixed state, and then, before passing the stock solution to the desalination tower 3, the anion resin 101 and the anion resin 101 are collected from the ion exchange resin storage tank 18. Inert resin 102 and cationic resin 103 are sent to each desalination tower 3 through recycled ion exchange resin transfer pipe 19 and filled.
Subject to desalination treatment.

By the way, in this mixed bed type desalination apparatus, separation of the cation resin and anion resin during regeneration of the ion exchange resin is an important point in terms of the performance of the desired desalination treatment. The cationic resin is regenerated by acidic chemicals and the anionic resin is regenerated by alkaline chemicals separately, but if the two resins are not separated accurately enough, reverse regeneration occurs.

In other words, if a cation resin is mixed in the anion resin layer, the cation resin is reversely regenerated with an alkaline chemical during regeneration of the anion resin, and for example, R-Na (R represents the base of the ion exchange resin) is generated. In addition, if an anion resin is mixed in the cation resin layer, the anion resin is reversely regenerated with acidic chemicals during regeneration of the cation resin, and for example, R-804 is generated.These reverse regenerated ion exchange resins When used as is, due to the selectivity of ion-exchange resins, ions contained in the stock solution are attracted, so there are separation methods that use an inert resin as shown in Figure 1 above, and separation methods that use cationic resins and anionic resins. A method has been proposed in which ion exchange resins are mixed together without being completely separated, and the ion exchange resins are regenerated using a third regenerating agent.

However, the above-mentioned method of regenerating using the third regenerating agent has the drawbacks of low regeneration efficiency and long regeneration time.

On the other hand, in the conventional technology that uses the above-mentioned inert resin to separate the cationic resin and anionic resin, the inert resin used to improve separation is desorbed together with the cationic resin and anionic resin during the liquid flow treatment. Since it is held in the salt tower 3, there is a drawback that the ion exchange performance is not sufficiently exhibited. In other words, inert resins with intermediate specific gravity used to improve separation during regeneration of cationic resins and anionic resins must be inactive and ineffective in terms of ion exchange; Since it is inert, ion exchange performance tends to deteriorate.

This is because ion exchange requires contact between the ion exchange resin and the liquid, and the presence of an inert resin in the ion exchange resin layer reduces the chance of contact between the ion exchange resin and the liquid. . As a result, there is a drawback that impurities in the raw solution leak into the treated solution, and the inert resin brought into the demineralization tower 3 is not sufficiently mixed with the cationic resin and anionic resin, resulting in the inert resin being left in the demineralization tower 3. When active resin pools were present, there was a drawback that the desalting performance was significantly reduced.

It is rumored that there is a fundamental problem in bringing inert resin into the desalination tower 3.

[Purpose of the invention]

It is an object of the present invention to regenerate ion exchange resins used in mixed bed desalination equipment, which eliminates the drawbacks of the prior art and prevents deterioration of desalination performance due to the introduction of inert resin into the desalination tower. In addition to providing a method, another object is to provide an ion exchange resin regeneration device for use in a hotbed desalination device that can reliably carry out the method, and a further object is to provide an ion exchange resin regeneration device for use in a hotbed desalination device. An object of the present invention is to provide an ion exchange resin regeneration device used in a mixed bed desalination device that can improve treatment efficiency.

[Summary of the invention]

The method of the present invention is characterized in that only the cationic resin and anionic resin, excluding the inert resin, are sent from the regenerated ion exchange resin into the demineralization tower in the pre-processing of the raw solution, and with this configuration, It is possible to prevent the demineralization performance from decreasing due to the introduction of the inert resin into the demineralization tower.

Further, in the apparatus of the present invention, the first regeneration tower that takes in the ion exchange resin from the demineralization tower is provided with a means for taking out only the ion exchange resin from among the inert resin and the regenerated ion exchange resin. It is characterized in that it is configured so that only the regenerated ion exchange resin is sent from the second regeneration tower to the demineralization tower, and with this configuration, the method of the present invention can be carried out reliably.

Furthermore, in another apparatus of the present invention, an inert resin storage tank for taking in an inert resin is connected to the first regeneration tower, in addition to a second regeneration tower for taking out either an anion resin or a cation resin. , the inert resin storage tank and the first regeneration tower are connected through an inert resin storage tank pipe; 1. This method is characterized in that it is structured so that only the regenerated ion exchange resin is sent from the second regeneration tower to the demineralization tower. It is possible to improve the regeneration processing efficiency of the ion exchange resin in the regeneration tower 1.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 2 and 3 show an example of a reproducing apparatus for implementing the method of the present invention. In this embodiment, the same members as those shown in FIG. 1 are designated by the same reference numerals. The above explanation will be omitted.

In this embodiment, a level switch 21 is attached to the first regeneration tower 8, and a controller 22 is attached to the stop valve 12 of the cationic resin extraction pipe 11 provided at the outlet of the first regeneration tower 8. and the level switch 21 and the controller 22 are connected to constitute means for taking out only the ion exchange resin from the first regeneration tower 8, that is, means for taking out only the cation resin 103 in this embodiment. .

The level switch 21 operates when the regenerated cationic resin 103 is taken out from the inert resin 102 and the cationic resin 103 remaining in the first regeneration tower 8.
The upper surface of the inert resin 1020 layer is detected, and based on the detection of the upper surface of the inert resin 102, it is detected that the cationic resin 103 has been taken out from the first regeneration tower 8, and the detection signal 23 is sent to the controller 22. The controller 22 sends the detection signal 2 from the level switch 21 to
3, the stop valve 12 of the cationic resin extraction pipe 11 is closed.

In addition, in this embodiment, a cation resin extraction pipe 11 connects the first regeneration tower 8 and the ion exchange resin tank 18, and an anion resin area extraction pipe 16 connects the second regeneration tower 15 and the ion exchange resin storage tank 18. and the ion exchange resin tank 18,
The recycled ion exchange resin transfer pipe 19 connects this ion exchange resin storage tank 18 and each demineralization tower 3 to the first. The structure is such that only the regenerated ion exchange resin can be fed from the second regeneration towers 8 and 15 to the demineralization tower 3.

Next, an example of the method of the present invention will be explained together with the operation of the reproducing apparatus of the above embodiment.

The ion exchange resin to be regenerated is taken into the first regeneration tower 8, where the ion exchange resin and the inert resin 102 are stirred by a stirring means, and then the inert resin 102 is mixed.
The anion resin 101 is separated into an anion resin 101 and a cation resin 103 via an anion resin transfer pipe 1.
3 to the second regeneration tower 15 for separation. Therefore, the inert resin 102 and the cationic resin 103 are left in the first regeneration tower 8. Next, an acidic chemical is injected into the first regeneration tower 8 through the drug passage means to regenerate the cationic resin 103. . Also,
An alkaline chemical is injected into the second regeneration tower 15 through another drug passage means to regenerate the anion resin 101.

After the regeneration treatment of the cationic resin 103, the stop valve 12 of the cationic resin take-out pipe 11 is opened, the cationic resin 103 is taken out from the first regeneration tower 8, and the cationic resin 10
3 is sent to the ion exchange resin storage tank 18 through the cation resin take-out pipe 11 and stored therein. As the cationic resin 103 is taken out from the first regeneration tower 8, the upper surface level of the layer of the inert resin 102 is lowered, and when the upper surface level of the layer of the cine-activated resin 102 is detected by the level switch 21, this level is lowered. From switch 21 to controller 22
A detection signal 23 is sent to the controller 22, and the stop valve 12 of the scation resin extraction pipe 11 is closed. As a result, only the cationic resin 103 is taken out from the first regeneration tower 8, and the inert resin 102 is left as is in the first regeneration tower 8, as shown in FIG.

On the other hand, after the anion resin 102 is regenerated, the anion resin 101 is taken out from the second regeneration tower 15 through the anion resin take-out pipe 16, and this is also taken out from the ion exchange resin storage tank 18.
In Fig. 3, the eel sent to and stored is designated by numeral 10.
Reference numeral 5 indicates an ion exchange resin layer in the ion exchange resin storage chamber, which is made up of only an anion resin and a cation resin.

Next, before the liquid is passed to the demineralization tower 3, the regenerated ion exchange resin is sent from the ion exchange resin storage tank 18 through the regenerated ion exchange resin transfer pipe 19 and filled.

Therefore, only the ion exchange resin excluding the inert resin 102 is sent to the demineralization tower 3, so it is possible to prevent demineralization performance from deteriorating due to the inert resin being mixed into the ion exchange resin layer. .

In this example, the cationic resin 103 is sent from the first regeneration tower 8 to the second regeneration tower 15, leaving the anion resin 101 and inert resin 102 in the first regeneration tower 8, and the anion resin 101 is subjected to regeneration treatment. Thereafter, the anionic resin 101 may be taken out while leaving the inert resin 102 in the first regeneration tower 8.

Furthermore, a circuit combining a timer and a relay may be provided in place of the level switch 21, and this circuit may be used to control the stop valve of the ion exchange resin extraction pipe at the outlet of the first regeneration tower 8.

Next, FIG. 4 shows another example of a reproducing apparatus that implements the method of the present invention.

In the embodiment shown in this figure, the first regeneration tower 8 is connected to the second regeneration tower 8.
An inert resin storage tank 26 is connected to the outside of the regeneration tower 15.

The inlet of this inert resin storage tank 26 is connected to the boundary between the inert resin and the cationic resin layer separated in the first regeneration tower 8 through an inert resin take-out pipe 24 having a stop valve 25, The outlet of the inert resin storage tank 26 is connected to the upper part of the first regeneration tower 8 through an inert resin coal selection pipe 27 having a stop valve 28 .

In the embodiment shown in FIG. 4, the first regeneration tower B
The anion resin 101, the inert resin 102, and the cation resin 103 are stirred in the chamber, and then the anion resin 101 and the cation resin 103 are separated through the inert resin 102. The inert resin 102 is sent to the second regeneration tower 15 and sent to the inert resin storage tank 26 through the inert resin take-out pipe 24, leaving only the cationic resin 103 in the first regeneration tower 8.

Then, after the cationic resin 103 is regenerated in the first regeneration tower 8 and sent to the ion exchange resin storage tank 18, it is transferred from the inert resin storage tank 26 to the first regeneration tower 8 through the inert resin coal separation pipe 27. By performing coal washing on the activated resin 102, it becomes possible to regenerate only the cationic resin 103, excluding the inert resin 102, in the first regeneration tower 8, thereby improving the regeneration efficiency. .

Regarding other configurations and functions of the embodiment shown in FIG. 4,
This is similar to that shown in FIGS. 2 and 3 above.

Note that in the present invention, the ion exchange resin storage tank 18 is omitted, and the first
．． It is also possible to apply a type in which the heion exchange resin of each demineralization tower 3 is directly fed from the second regeneration tower 8, 15.

〔Effect of the invention〕

According to the method of the present invention as described above, only the cationic resin and anionic resin, which are the recycled exchange resin with the inert resin removed, are sent into the desalination tower before the treatment of the raw solution. This has the effect of preventing deterioration of desalting performance due to inert resin being mixed into the ion exchange resin layer in the salt tower.

Further, according to the apparatus of the present invention, the means for extracting only the ion exchange resin from among the inert resin and the regenerated ion exchange resin is sent to the first regeneration tower into which the ion exchange resin to be regenerated is sent from the demineralization tower. 1. Since the structure is such that only the regenerated ion exchange resin is sent from the second regeneration tower to the demineralization tower, the method of the present invention described above can be carried out reliably.

According to yet another device of the present invention, in the device,
In addition to the second regeneration tower, an inert resin storage tank for taking in inert resin is connected to the first regeneration tower, and the inert resin storage tank and the first regeneration tower are connected by an inert resin coal separation pipe. Therefore, the first regeneration tower can regenerate only the ion exchange resin, excluding the inert resin, and therefore has a special effect of improving the regeneration efficiency.

[Brief explanation of the drawing]

Fig. 1 is a system diagram showing a conventional mixed bed desalination apparatus and an ion exchange resin regeneration apparatus, and Fig. 2 shows an example of a mixed bed desalination apparatus and a regeneration apparatus for carrying out the method of the present invention. FIG. 3 is an explanatory diagram of the regeneration process in the reproducing apparatus shown in FIG. 2, and FIG. 4 is a system diagram showing another reproducing apparatus for carrying out the method of the present invention. DESCRIPTION OF SYMBOLS 1... Raw solution transfer pipe, 3... Desalting tower, 4... Processed liquid removal pipe, 6... Ion exchange resin transfer pipe, 8...
First regeneration tower, 9... Pressure water supply pipe as a means for stirring the ion exchange resin and inert resin, 11... Cation resin extraction pipe, 13... Anion resin transfer pipe, 15... Second regeneration tower, 16... Anion resin extraction pipe, 18... Ion exchange resin storage tank, 19...
Regenerated ion exchange resin transfer pipe, 21... Level switch constituting means for taking out only the ion exchange resin from the first regeneration tower, 22... Controller, 24... First regeneration tower Inert resin extraction pipe from, 26... Inert resin storage tank, 27... Inert resin coal sorting pipe, 100.
... Ion exchange resin layer in the demineralization tower, 101 ... Anion resin, 102 ... Inert resin, 103. ,. Cation resin, 105: Ion exchange resin layer containing only recycled anion resin and cation resin.

Claims (1)

[Claims] 1. Take out the ion exchange resin to be regenerated from the demineralization tower and put it into the regeneration tower, and in this regeneration tower, the cation exchange resin, the anion exchange resin, and the intermediate specific gravity of these ion exchange resins are separated. In a regeneration method in which a cation exchange resin and an anion exchange resin are separated through the inert resin after stirring with an inert resin and regenerated, the cation exchange resin and the anion exchange resin are separated from each other through the inert resin, and in the demineralization tower at a stage before the raw solution treatment, A method for regenerating an ion exchange resin for use in a mixed bed desalination equipment, characterized in that only a cation exchange resin and an anion exchange resin are fed, by removing inert resin from the regenerated ion exchange resin. 2 A first regeneration tower that takes in the ion exchange resin to be regenerated is connected to the demineralization tower, and a cation exchange resin, an anion exchange resin, and a mixture of intermediate specific gravity of these ion exchange resins are connected to the demineralization tower. A means for stirring the active resin is provided, and a second regeneration tower for taking in either an anion exchange resin or a cation exchange resin is connected to the first regeneration tower, and the first regeneration tower and the second regeneration tower In the regeneration apparatus, the tower is provided with a means for passing a chemical through which the ion exchange resin is regenerated, and the first regeneration tower is provided with means for extracting only the ion exchange resin from among the inert regenerated resin and the regenerated ion exchange resin. Regeneration of ion exchange resin used in a mixed bed type desalination apparatus, characterized in that it is configured such that only the regenerated ion exchange resin is sent from the first and second regeneration towers to the demineralization tower. Device. 3. A first regeneration tower that takes in the ion exchange resin to be regenerated is connected to the demineralization tower, and a cation exchange resin, an anion exchange resin, and intermediate specific gravity of these ion exchange resins are connected to the first regeneration tower. A means for mixing the inert resin with the inert resin is provided, and a second regeneration tower that takes in either an anion exchange resin or a cation exchange resin is connected to the first regeneration tower, and the first and second regeneration towers are In the regeneration apparatus, the regeneration tower is provided with a drug passage means for regenerating the ion exchange resin, and the first regeneration tower is connected to an inert resin storage tank for taking in an inert resin, and the inert resin storage tank and the first regeneration tower are connected to each other. The first regeneration tower is connected to the demineralization tower through an inert resin return pipe, and only the regenerated ion exchange resin is sent from the first and second regeneration towers to the demineralization tower. A regeneration device for ion exchange resin used in mixed bed desalination equipment.