JPS61138589A - Method for packing ion-exchange resin into condensate desalting tower - Google Patents

Abstract

PURPOSE:To pack resins in a uniformly dispersed state by dropping simmultaneously cation-exchange resins regenerated in a cation-exchange resin regenerating tower and anion-exchange resins regenerated in an anion-exchange resin regenerating tower small by small from the upper part of a condensate desalting tower. CONSTITUTION:Resins 14 and 15 are simultaneously dropped small by small from the upper part of the condensate desalting tower 13, when the cation- exchange resin 14 regenerated in the cation-exchange resin regenerating tower 16 and the anion-exchange resin 15 regenerated in the anion-exchange resin regenerating tower 18 are packed into the condensate desalting tower 13. Consequently, the cation-exchange resin 14 and the anion-exchange resin 15 which are dispersed remarkably, uniformly as compared with a conventional method can be packed into the condensate desalting tower 13.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for filling an ion exchange resin into a condensate demineralization tower.

[Technical Background of the Invention J In general, in nuclear reactors, especially boiling water reactors, corrosion products are generated due to corrosion of sub-system equipment, piping, etc., and these are radioactive in the reactor and cause damage to equipment piping, etc. There is a risk that the radiation exposure rate of the plant will increase significantly.

For this reason, in am water reactors, a condensate purification system is installed,
This condensate purification system removes corrosion products.

Figure 3 shows such a condensate purification system, in which steam generated in the reactor pressure vessel 2 housing the reactor core 1 passes through the main steam pipe 3 and drives the steam turbine 4, and then passes through the condenser. The condensate 6 is converted into condensate 6 in the condensate pump 5, the pressure is raised by the condensate pump 7, the condensate is passed through the condensate pipe 8 and filtered by the condensate filtration device 9, and then desalted by the condensate desalination device @10, and the water is demineralized by the feed water pump 11. After being pressurized, it is heated by the feedwater heater 12 and recycled into the reactor pressure vessel 2 .

That is, the condensate filtration device 9 and the condensate desalination device 10 are
This is a device that removes solid and ionic impurities dissolved in condensate and desalinates the condensate. A floor-type salt tower is located here.

In such a mixed bed type demineralization tower, the more uniform the mixing state of the cation exchange resin and the anion exchange resin, the higher the degree of desalination treatment can be performed. In such a mixed-bed demineralization tower, the desalination performance deteriorates, and the regeneration methods for the saturated cation exchange resin and anion exchange resin are different. It is taken.

That is, in FIG. 4, the desalination performance has decreased and the saturated cation exchange resin 14 and anion exchange resin 15 in the condensate demineralization tower 13 are transferred to the cation exchange resin regeneration tower 16, and the plant water 17 and Cation exchange resin 1 is removed by sluicing, which causes the resin to become wet and itchy due to the inflow of air 18.
4 and anion exchange@resin 15.

That is, the cation exchange resin 14 has a specific gravity of 1.28, for example.
1J/Ci, anion exchange resin 15 is, for example, 1.07 (
]/G7, and can be separated by sluicing due to the difference in specific gravity.

The anion exchange resin 15 separated in this manner is forced through the pipe 17 using, for example, high-pressure air, and is transferred into the anion exchange resin regeneration tower 18 .

The cation exchange resin 14 in the cation exchange resin regeneration tower 16 is regenerated with one sulfuric acid, and the anion exchange resin 15 in the anion exchange resin regeneration tower 18 is regenerated with caustic soda 20.

The cation exchange resin 14 and anion exchange resin 15 thus regenerated are transferred into the resin mixing tower 21, and after being uniformly mixed within the resin mixing tower 21,
It passes through the transfer pipe 22 and is filled into the condensate demineralization tower 13 again.

[Problems with background technology] However, in this method, cation exchange resin 14
And when regenerating the anion exchange resin 15,
Even if the cation exchange resin 14 and the anion exchange resin 15 are uniformly mixed in the resin mixing tower 21, cation exchange does not occur during transfer to the condensate demineralization tower 13 or when filling the condensate demineralization tower 13. Due to the difference in specific gravity between the resin 14 and the anion exchange resin 15, these are separated, and the cation exchange resin 14.15 and the anion exchange resin 1 filled in the condensate demineralization tower 13 are separated.
5 cannot necessarily be said to be filled in a uniform state. Therefore, this causes a considerable decrease in desalting performance.

FIG. 5 shows the cation exchange resin 14 accommodated in the condensate demineralization tower 13, with the horizontal axis representing the resin filling depth and the vertical axis representing the resin ratio.
and shows the distribution state of the anion exchange resin 15,
Curve a shown as a solid line in the figure is anion exchange resin 1
5, the curve indicated by a dashed line indicates the cation exchange IIA resin 14. As is clear from the figure, as the resin filling depth increases, the ratio of the cation exchange resin 14 having a small specific gravity increases.

Note that, as shown in FIG. 6, the resin filling depth is expressed with the bottom surface of the resin filling portion of the condensate demineralization tower 13 being 0% and the top surface being 100%.

[Object of the invention] The present invention has been made in response to such conventional circumstances,
An object of the present invention is to provide a method for filling an ion exchange resin into a condensate demineralization tower by which a cation exchange resin and an anion exchange resin can be easily filled into the condensate demineralization tower in a uniformly mixed state. That is.

[Summary of the Invention] That is, the present invention provides a method for filling a cation exchange resin regenerated in a cation exchange resin regeneration tower and an anion exchange resin regenerated in an anion exchange resin regeneration tower into a condensate demineralization tower. In doing so, the cation exchange resin and anion exchange resin are simultaneously dropped from the upper part of the condensate demineralization tower little by little, and the cation exchange resin and anion exchange resin are dropped into the condensate demineralization tower. This is a method for charging an ion exchange resin into a condensate demineralization tower, which is characterized in that the resin is charged in a uniformly mixed state.

[Embodiments of the invention] The details of the present invention will be explained below with reference to the drawings.

FIG. 1 shows a resin regeneration system used in an embodiment of the method of filling an ion exchange resin into a condensate demineralization tower 13 of the present invention. Cation exchange resin 14 and anion exchange resin 15 with decreased salt performance
is transferred to the cation exchange resin regeneration tower 16 via piping 23, and is sluiced in the cation exchange resin regeneration tower 16 by plant water 17 and air 18, and is separated from the cation exchange resin 14 due to the difference in specific gravity of these resins. The anion exchange resin 15 is separated from the anion exchange resin 15. The separated anion exchange resin 15 is transferred to an anion exchange resin regeneration tower 18 via a pipe 17.
will be transferred to. The cation exchange resin 14 in the cation exchange resin regeneration tower 16 is regenerated with sulfuric acid 19, and the anion exchange resin 15 in the anion exchange resin regeneration tower 18 is regenerated with caustic soda 20.

After this, 1g of cation exchange! The cation exchange resin 14 in the resin regeneration tower 16 is transferred to the resin supply pipe 24 by a cation exchange resin transfer pipe 25 connected to the resin supply pipe 24 that opens on the top surface of the condensate demineralization tower 13 . At the same time, the anion exchange resin 15 contained in the anion exchange resin regeneration tower 18 is transferred to the resin supply pipe 24 by an anion exchange resin transfer pipe 26 connected to the resin supply pipe 24 . The cation exchange resin 14 and anion exchange resin 15 transferred to the resin supply pipe 24 are mixed as they fall little by little through the resin supply pipe 24 and the condensate demineralization tower 13.
3 and filled in a uniformly mixed state.

Note that the cation exchange resin 14 and the anion exchange resin 1
Since 5 is transferred little by little through the cation exchange resin transfer pipe 25d5 and the anion exchange resin transfer pipe 26, there is a risk that the cation exchange resin 14 and anion exchange resin 15 may settle in the transfer pipe. Sedimentation can be prevented by making the caliber small and setting the transfer flow rate to a certain value or higher.

Figure 2 shows the relationship between the Mi4 fat filling depth and the resin ratio when the condensate demineralization tower 13 is filled with the cation exchange resin 14 and the anion exchange resin 15 using this method. Curve C shown is for anion exchange resin 15,
A curve d shown by a dashed line indicates the cation exchange resin 14.

As is clear from the figure, compared to the conventional method shown in FIG. 13 is filled in.

[Effects of the Invention] As described above, in the method of filling an ion exchange resin into a condensate demineralization tower of the present invention, the cation exchange resin and anion exchange resin regenerated in the cation exchange resin regeneration tower are Since the anion exchange resin regenerated in the tower is simultaneously dropped in small quantities from the top of the condensate demineralization tower, the amount of cation exchange resin and anion exchange resin inside the condensate demineralization tower is much larger than before. It can be filled in a uniform state.

[Brief explanation of the drawing]

Fig. 1 is a piping system diagram showing a condensate purification system used in the method of filling an ion exchange resin into a condensate demineralization tower of the present invention;
The figure is a graph showing the mixing state of the causative ion exchange resin and the anion exchange resin that were charged into the condensate desalination plant by the method shown in Figure 1. Fig. 4 is a piping system diagram showing a condensate purification system, Fig. 4 is a piping system diagram showing a conventional resin regeneration system, and Fig. 5 shows cations filled in the condensate demineralization tower by the resin regeneration system shown in Fig. 4. A graph showing the mixing state of the exchange resin and the anion exchange resin, and FIG. 6 is an explanatory diagram showing the resin filling depth. 13......Condensate desalination tower 14...
......Cation exchange resin 15...
...Anion exchange resin 16...
...Cation exchange resin regeneration tower 18...
... Anion Exchange Resin Regeneration Tower Patent Attorney Sasa Suyama - Figure 2 mN1IL EbisuXl = T%1 Figure 3

Claims (1)

[Claims] (1) When filling the cation exchange resin regenerated in the cation exchange resin regeneration tower and the anion exchange resin regenerated in the anion exchange resin regeneration tower into the condensate demineralization tower,
The cation exchange resin and anion exchange resin are simultaneously dropped in small amounts from the upper part of the condensate demineralization tower, and the cation exchange resin and anion exchange resin are uniformly mixed in the condensate demineralization tower. 1. A method for filling an ion exchange resin into a condensate demineralization tower, the method comprising filling the ion exchange resin in a condensate demineralization tower.