JPH0353758Y2 - - Google Patents

Description

[Detailed explanation of the idea]

<Industrial Application Field> The present invention relates to a regeneration facility for a condensate desalination device for treating condensate in a thermal power plant or an electronic power plant. <Prior Art> A condensate desalination device for treating condensate from a thermal power plant or an electronic power plant is comprised of a plurality of water towers and a series of regeneration equipment. In other words, when condensate is treated with multiple water towers, and the pressure loss of one of the water towers increases, or the purity of the treated water decreases, or when a fixed yield is reached, the water tower The used mixed resin of cation exchange resin and anion exchange resin is transferred to the regeneration equipment, and the recycled mixed resin that has already been regenerated and stored in the regeneration equipment is filled into the former water tower and water is passed through. Or, by switching to water flowing through a standby water tower that has been filled with recycled mixed resin that has already been recycled in the recycling equipment, the previously used mixed resin transferred to the recycling equipment can be recycled. This is to prepare for the next recycled used mixed resin. There are various types of regeneration equipment used in such condensate desalination equipment, but in recent years, regeneration equipment that regenerates cation exchange resin and anion exchange resin in separate towers has been introduced in order to obtain high-purity treated water. It is used. That is, as shown in Fig. 3, there is a separation/cation exchange resin regeneration tower 1 and a mixed resin receiving tank 2.
, an anion exchange resin regeneration tower 3, and a resin storage tank 4 installed as necessary. The method of operating the conventional regeneration equipment is as follows. That is, the used mixed resin transferred via the resin transfer pipe 5 and the used mixed resin in the mixed resin receiving tank 2, which will be described later, are received into the separation/cation exchange resin regeneration tower 1 and thoroughly scrubbed with air or the like. After discharging the crud such as iron oxide to the outside of the regeneration tower 1 with a water stream, backwash water flowing upward from the lower part of the regeneration tower 1 flows in to sufficiently expand both ion exchange resins and perform both ion exchange. Utilizing the difference in sedimentation speed of the resins, the cation exchange resin 6 is collected in the lower layer and the anion exchange resin is collected in the upper layer, and then by stopping the flow of backwash water and settling, the cation exchange resin 6 is in the lower layer and the anion exchange resin is in the upper layer. A replacement resin 7 is formed. Next, a small amount of anion exchange resin 7a above the separation interface 8 of both ion exchange resins (indicated by diagonal lines)
Most of the other anion exchange resin 7 is transferred to the anion exchange resin regeneration tower 3 using the resin transfer pipe 9.
A small amount of the anion exchange resin 7a left therein and a small amount of the cation exchange resin 6a (indicated by diagonal lines) below the separation boundary surface 8 are transferred to the mixed resin receiving tank 2 using the resin transfer pipe 10. Transport. After such transfer is completed, in the separation and cation exchange resin regeneration tower 1, the acid regenerant passage pipe 1 is
1. The acid regenerant is passed through the distributor 12, then extruded and washed, and the cation exchange resin 6 is regenerated by a conventional method. On the other hand, in the anion exchange resin regeneration tower 3, an alkali regenerant is passed through an alkali regenerant passage pipe 13 and a distributor 14, followed by extrusion and washing, and the anion exchange resin 7 is regenerated by a conventional method. After such regeneration is completed, if the resin storage tank 4 is installed as shown in FIG. At the same time, the recycled anion exchange resin 7 in the anion exchange resin regeneration tower 3 is transferred to the resin storage tank 4 using the resin transfer pipe 16, and after the transfer, both ion exchange resins are sufficiently Mix and store as recycled mixed resin. Further, the mixed resin in the resin storage tank 4 is transferred to the water tower via the resin transfer pipe 17 at the required time. Note that the mixing of both ion exchange resins may be carried out in a water tower immediately before water is passed through. In addition, if there is a standby water tower, the installation of the resin storage tank 4 can be omitted, and in this case, the anion exchange resin regeneration tower Transfer the recycled anion exchange resin 7 in 3 using the resin transfer pipe 18, thoroughly mix both ion exchange resins after transfer, and use the recycled mixed resin using the resin transfer pipe 19. The finished mixed ion exchange resin is transferred to the regeneration equipment and then transferred to the empty water tower, and the water tower is placed on standby. On the other hand, the mixed resin 20 in the mixed resin receiving tank 2 is not regenerated, but is transferred via the resin transfer pipe 21 to the separation and cation exchange resin regeneration tower 1, which is emptied by, for example, transferring the regenerated ion exchange resin. It is returned, mixed with the used mixed resin transferred from the next water tower, and recycled. As explained above, in the conventional regeneration equipment equipped with at least the separation and cation exchange resin regeneration tower 1, the mixed resin receiving tank 2, and the anion exchange resin regeneration tower 3, the separation and cation exchange resin regeneration tower 1 is capable of handling both ions. After the exchange resin is separated, a small amount of the anion exchange resin 7a remains above the separation boundary surface 8, and most of the anion exchange resin 7 is transferred to the anion exchange resin regeneration tower 3, so that the cations near the separation boundary surface 8 are It is possible to effectively prevent the exchange resin 6a from entering the anion exchange resin regeneration tower 3, and furthermore, it is possible to effectively prevent the exchange resin 6a from entering the anion exchange resin regeneration tower 3, and furthermore, the remaining small amount of the anion exchange resin 7a and the small amount of the cation exchange resin 6a below the separation boundary surface 8 are removed. Since the anion exchange resin 7a is transferred to the mixed resin receiving tank 2, it is possible to effectively prevent the anion exchange resin 7a from remaining in the separation/cation exchange resin regeneration tower 1. Therefore, it is possible to prevent the alkali regenerant from coming into contact with the cation exchange resin and the acid regenerant from coming into contact with the anion exchange resin.
It is possible to reduce the abundance ratio of the anion exchange resin in the form of anion exchange resin or in the form of SO ₄ , thereby increasing the purity of the treated water. <Problems to be solved by the invention> However, in the conventional regeneration equipment described above, the position of the distributor 12 installed in the separation/cation exchange resin regeneration tower 1 is such that the used mixed resin is backwashed, separated, and settled. Since the anion exchange resin 7 is located within or slightly above the anion exchange resin 7 that is formed during the process, the following problems occur. That is, when a used mixed resin is received in the conventional separation/cation exchange resin regeneration tower 1 and backwashed to separate it into both ion exchange resins, the distributor 12, which is an internal structure of the tower, and the acid regeneration The agent passage pipe 11 becomes an obstacle to the upward flow of the expanding slurry of both ion exchange resins, and the ideal upward flow required for separation is not achieved, resulting in incomplete separation of both ion exchange resins. . Furthermore, a part of the cation exchange resin that has been blown up by the upward flow remains in the upper part of the distributor 12 and the acid regenerant pipe 11, and most of the anion exchange resin 7 in the previous period is transferred to the anion exchange resin regeneration tower 3. When doing so, a phenomenon occurs in which the remaining cation exchange resin is mixed into the anion exchange resin 7 and transferred into the anion exchange resin regeneration tower 3. Therefore, due to the above-mentioned reasons, a small amount of cation exchange resin will be mixed into the anion exchange resin regeneration tower 3, and if you want to obtain higher purity treated water, it is necessary to use the conventional separation and cation exchange resin regeneration tower. The above-mentioned problems must be solved. The present invention solves the above-mentioned problems in conventional regeneration equipment, and allows the used mixed resin to be more completely separated into both ion exchange resins, and the amount of cation exchange resin transferred to the anion exchange resin regeneration tower. The aim is to obtain higher purity treated water by reducing the amount of water as much as possible. <Means for Solving the Problems> The present invention provides separation and cation exchange resin regeneration equipment in a condensate desalination equipment regeneration equipment that is equipped with at least a separation and cation exchange resin regeneration tower, a mixed resin receiving tank, and an anion exchange resin regeneration tower. A distributor installed in the exchange resin regeneration tower for passing acid is used to backwash and separate the received mixed resin into two layers of cation exchange resin and anion exchange resin. The present invention relates to a regeneration facility for a condensate desalination device, which is installed above the interface of an expansion layer. The present invention will be explained in detail below with reference to the drawings. FIG. 1 is an explanatory diagram of a regeneration facility showing an example of an embodiment of the present invention, and the feature of the present invention is that a distributor 12 for passing acid
is provided above the interface 22 of the expanded layer of both ion exchange resins formed for backwash separation. The rest of the configuration is the same as the conventional regeneration equipment shown in FIG. 3, so the explanation will be omitted. <Function> The operation of the regeneration equipment according to the present invention is as follows. That is, from the water tower (not shown) to the resin transfer pipe 5
The used mixed resin transferred through the mixed resin receiving tank 2 and the used mixed resin in the mixed resin receiving tank 2 are received in the separation/cation exchange resin regeneration tower 1, and thoroughly scrubbed with air etc. to remove iron oxide and other crud. is discharged from the regeneration tower 1 by a water stream, and then backwash water flows upward from the lower part of the regeneration tower 1 to sufficiently expand both ion exchange resins and eliminate the difference in sedimentation rate of both ion exchange resins. The cation exchange resin is used to collect the cation exchange resin in the lower layer and the anion exchange resin in the upper layer, and then, by stopping the flow of backwash water and settling, the cation exchange resin 6 is formed in the lower layer and the anion exchange resin 7 is formed in the upper layer. In the present invention, since the distributor 12 is installed above the interface 22 of the expanded layer of both ion exchange resins generated for backwash separation, the upward flow of the expanding slurry of both ion exchange resins is prevented. There are no internal structures in the column that can become an obstacle, and therefore an ideal upward flow can be obtained, and as a result, both ion exchange resins can be separated more effectively. Furthermore, the cation exchange resin that rose up due to the upward flow was transferred to the distributor 12.
Also, the acid regenerant does not remain in the upper part of the pipe 11. Next, a small amount of anion exchange resin 7a above the separation interface 8 of both ion exchange resins (indicated by diagonal lines)
and most other anion exchange resins 7
is transferred to the anion exchange resin regeneration tower 3 using the resin transfer pipe 9, and then a small amount of the remaining anion exchange resin 7a and a small amount of cation exchange resin 6a below the separation boundary surface 8 (indicated by diagonal lines) are is transferred to the mixed resin receiving tank 2 using the resin transfer pipe 10. After such transfer is completed, in the separation and cation exchange resin regeneration tower 1, the acid regenerant passage pipe 1 is
1. The acid regenerant is passed through the distributor 12, then extruded and washed, and the cation exchange resin 6 is regenerated by a conventional method. In addition, in the separation and cation exchange resin regeneration tower 1 used in the present invention, the distributor 12 is installed considerably above the cation exchange resin 6 filled therein, so as shown in FIG. A level switch 23 is attached to the separation/cation exchange resin regeneration tower 1, and before passing the acid regenerant,
It is preferable to drain the water in the regeneration tower 1 to a position slightly above the cation exchange resin 6 packed bed. By removing the water in the regeneration tower 1 in advance in this manner, the amount of water replaced can be reduced, so that the time required for drug passage or extrusion can be shortened. On the other hand, in the anion exchange resin regeneration tower 3, there is also an alkali regenerant flow pipe 13 and a distributor 14.
The anion exchange resin 7 is regenerated by a conventional method by passing an alkali regenerating agent through the resin, followed by extrusion and washing. After such regeneration is completed, if a resin storage tank 4 is installed as in the embodiment shown in FIG. At the same time, the recycled anion exchange resin 7 in the anion exchange resin regeneration tower 3 is transferred to the resin storage tank 4 using the resin transfer pipe 16, and after the transfer, both ion exchange resins are transferred to the resin storage tank 4. Mix thoroughly and store as recycled mixed resin. The mixed resin in the resin storage tank 4 is transferred to the water tower via the resin transfer pipe 17 at the required time. In addition, if there is a standby water tower, the installation of the resin storage tank 4 can be omitted, and in this case, the anion exchange resin regeneration tower Transfer the recycled anion exchange resin 7 in 3 using the resin transfer pipe 18, thoroughly mix both ion exchange resins after transfer, and use the recycled mixed resin using the resin transfer pipe 19. Using the used mixed ion exchange resin transfer pipe 19, the used mixed ion exchange resin is transferred to the regeneration equipment and then transferred to the empty water tower, and the water passage is set on standby. On the other hand, the mixed resin 20 in the mixed resin receiving tank 2 is not regenerated, but is transferred via the resin transfer pipe 21 to the separation and cation exchange resin regeneration tower 1, which is emptied by, for example, transferring the regenerated ion exchange resin. It is returned and mixed with the used mixed resin transferred from the next water tower for reuse. <Effects> As explained above, in the regeneration equipment of the present invention, the distributor installed in the separation and cation exchange resin regeneration tower backwashes the received mixed resin into two layers of cation exchange resin and anion exchange resin. Since it is installed above the interface of the expanded layer of both ion exchange resins that is generated for separation, there are no internal structures in the column that would obstruct the upward flow within the expanded layer, resulting in ideal upward flow. This allows for more effective separation of both ion-exchange resins, and also because the expanded layer of ion-exchange resin does not reach the distributor and acid regenerant pipe, making it possible to separate both ion-exchange resins more effectively. No cation exchange resin remains in the upper part of the tube and the acid regenerant passage tube. Therefore, the amount of cation exchange resin mixed in the anion exchange resin transferred to the anion exchange resin regeneration tower can be reduced compared to conventional regeneration equipment, and therefore, the amount of Na type cation mixed in the mixed resin after regeneration can be reduced. The abundance ratio of the exchange resin can be reduced, and treated water of higher purity can be obtained. Examples will be described below to make the effects of the present invention more clear. Example A separation and cation exchange resin regeneration tower with an inner diameter of 1500 mm and a straight section of 6400 mm was used, and the regeneration tower contained strongly acidic cation exchange resins Amberlite (registered trademark, hereinafter the same) 200c and 3480 and strong basic anion exchange resin Amberlite IRA. -900 and 2000 mixed resins were filled, and the following experiment was conducted. In other words, as the present invention, a distributor for passing acid is placed 2500 m above the mixed resin packed bed.
from the bottom of the regeneration tower.
Backwashing was carried out for 40 minutes with an upward flow of LV8 m/H, followed by settling and separation into a cation exchange resin layer in the lower layer and an anion exchange resin layer in the upper layer. Incidentally, the interface between the expanded layers of both ion-exchange resins produced for backwash separation was at a height of 700 mm below the distributor.
Next, most of the anion exchange resin 400 mm above the separation interface was transferred to an anion exchange resin regeneration tower. Next, the remaining small amount of anion exchange resin and a small amount of cation exchange resin 100 mm below the separation interface were transferred to a mixed resin receiving tank. The anion exchange resin transferred to the anion exchange resin regeneration tower and the cation exchange resin left in the separation/cation exchange resin regeneration tower are regenerated with a caustic soda solution and hydrochloric acid in a conventional manner, and after thorough washing, both An ion exchange resin was mixed, and condensate was treated using the mixed resin.

【table】

[Table] As shown in Table 1, it was confirmed that the present invention has an excellent effect in obtaining highly purified treated water.

[Brief explanation of the drawing]

Figures 1 and 2 both show embodiments of the present invention. Figure 1 is an explanatory diagram of the regeneration equipment of the present invention, and Figure 2 is a separation and cation exchange resin of another embodiment of the present invention. FIG. 3 is an explanatory diagram of a regeneration tower, and FIG. 3 is an explanatory diagram showing a conventional regeneration equipment. 1... Separation and cation exchange resin regeneration tower, 2...
Mixed resin receiving tank, 3...Anion exchange resin regeneration tower, 4...Resin storage tank, 6...Cation exchange resin, 7...Anion exchange resin, 8...Separation interface, 11...Acid regenerant pipe , 12...distributor, 13...alkaline regenerating agent delivery tube, 1
4...Distributor, 5, 9, 10, 1
5, 16, 17, 18, 19, 21... Resin transfer pipe, 20... Mixed resin, 22... Interface of expansion tank,
23...Level switch.

Claims (1)

[Scope of utility model registration request] In the regeneration equipment of the condensate desalination equipment, which is equipped with at least a separation/cation exchange resin regeneration tower, a mixed resin receiving tank, and an anion exchange resin regeneration tower,
Both ions are generated in order to backwash and separate the received mixed resin into two layers of cation exchange resin and anion exchange resin. Regeneration equipment for a condensate desalination equipment, characterized in that it is installed above the interface of an expanded layer of exchange resin.