JPH06106165A - Condensed water desalting device - Google Patents

Abstract

PURPOSE:To extend the life of an ion exchange resin and to reduce the regeneration frequency thereof by preventing the oxidative deterioration of the ion exchange resin and the consumption of the ion exchange capacity thereof. CONSTITUTION:A nitrogen gas supply device 20 is provided to the regeneration device 14 connected to a condensed water desalting device 9 and nitrogen piping 22 on a cation side supplying nitrogen gas is connected to a cation exchange resin regeneration tower 18 through the nitrogen main piping 21 connected to the nitrogen gas supply device 20 and, in the same way, nitrogen piping 23 on an anion side is connected to an anion exchange regeneration tower 19 and, further, the nitrogen piping 24 on the side of the condensed water desalting device 9 is connected to the condensed water desalting device 9. Nitrogen gas is sent to the respective regeneration towers 18, 19 to release and discharge clad from the ion exchange resin by bubbling. Nitrogen gas is sent to the condensed water desalting device 9 to prevent the oxidative deterioration of the ion exchange resin of said device 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a condensate demineralizer having a regenerator which is filled with a granular ion exchange resin.

[0002]

2. Description of the Related Art In a boiling water nuclear power plant, the inside of the reactor must be kept clean, so that the condensate flowing into the reactor from the condenser can be treated by a condensate filter and a condensate demineralizer. After being purified and purified to high purity, it is used as cooling water for the reactor.

A conventional example will be described with reference to FIG. The steam generated in the reactor pressure vessel 1 is sent to the turbine 3 via the main steam pipe 2, and the steam driving this turbine 3 is condensed in the condenser 4
Is condensed in and becomes condensed water. This condensate is boosted by a low-pressure condensate pump 5, passes through an air extractor 6, a steam condenser 7, and a condensate filter 8 and a condensate demineralizer 9 installed in a condensate purification system.
Removes impurities.

The condensate purified by the condensate filter 8 and the condensate demineralizer 9 is further pressurized by the high pressure condensate pump 10 and sent to the low pressure feed water heater 11 to be heated. Then, the pressure is further increased by the water supply pump 12, and the high-pressure water supply heater
It passes through 13 to be heated and supplied into the reactor pressure vessel 1.

By the way, the condensate demineralizer 9 is filled with a granular ion-exchange resin, and is mainly configured to remove soluble impurities in the condensate. If the condensate demineralizer's ability to remove impurities declines, remove the condensate demineralizer from the condensate purification system, and put the stand-by one into the condensate purification system to condense water continuously. Purify.

The ion exchange resin in the excluded condensate demineralizer is regenerated by the regenerator 14. The regenerator 14 comprises a condensate makeup water pump 15, a compressed air pipe 17 for the site, a cation exchange resin regeneration tower 18 and an anion exchange resin regeneration tower 19 as surrounded by the one-dot chain line. The condensate makeup water pump 15 is connected to the condensate storage tank 16.

The ion exchange resin is transferred from the condensate demineralizer 9 to the cation exchange resin regeneration tower 18. The cation-exchange resin regeneration tower 18 removes and removes insoluble impurities by the bubbling action of the air sent from the in-house compressed air pipe 17.

In the cation exchange resin regeneration tower 18, the cation exchange resin and the anion exchange resin are separated by sedimentation. Then, the anion exchange resin is transferred to the anion exchange resin regeneration tower 19. After removing insoluble impurities by the bubbling action by the air from the compressed air piping 17 for the inside of each regeneration tower 18 and 19 and removing the insoluble impurities, the anion exchange resin is a cation exchange resin regeneration tower.
Return to 18.

After the ion exchange resins are mixed in the cation exchange resin regeneration tower 18 by the bubbling action by the compressed air pipe 17 for the plant, the mixed ion exchange resins are transferred to the condensate demineralizer 9. The condensate demineralizer 9 is filled with stored water from the condensate storage tank 16 through the condensate makeup water pump 15, and the condensate demineralizer 9 is in a standby state.

[0010]

In the condensate demineralizer of the conventional condensate demineralizer, the air and water used when regenerating the ion exchange resin are directly supplied from the compressed air pipe 17 for the plant and the condensate storage tank 16. It had been. However, there is a problem in that the ion exchange resin is oxidatively deteriorated by the oxygen and carbon dioxide contained in the internal compressed air and the water stored in the condensate storage tank, and further, the carbon dioxide adsorption consumes the ion exchange capacity.

The present invention has been made to solve the above problems, and prevents the oxidative deterioration of the ion exchange resin, and
An object of the present invention is to provide a condensate demineralizer that can prevent the consumption of the ion exchange capacity, extend the life of the ion exchange resin, and reduce the frequency of regeneration.

[0012]

SUMMARY OF THE INVENTION The present invention is a condensate demineralizer for removing soluble impurities contained in condensate condensed in a condenser and an ion exchange resin in the condensate demineralizer. In the condensate demineralizer equipped with a cation-exchange resin regeneration tower and a regenerator having an anion-exchange resin regeneration tower, a nitrogen is added to the cation-exchange resin regeneration tower and the anion-exchange resin regeneration tower of the regenerator. It is characterized in that a nitrogen gas supply device for introducing gas is connected.

[0013]

[Function] Nitrogen gas is sent from the nitrogen gas supply device to the condensate demineralizer, the cation exchange resin regeneration tower and the anion exchange resin regeneration tower, and bubbling with nitrogen gas is performed when the ion exchange resin is regenerated. Also in the condensate demineralizer standby storage water, the water supplied from the condensate storage tank in the cation exchange resin regeneration tower is bubbled and deaerated with nitrogen gas and used as the condensate demineralizer resin storage water. .

[0014]

EXAMPLE An example of a condensate demineralizer according to the present invention will be described with reference to FIG. In FIG. 1, the same parts as those in FIG. 2 are designated by the same reference numerals, and the description of the overlapping parts will be omitted.

This embodiment is different from the conventional example in that the reproducing device 14
Cation Exchange Resin Regeneration Tower 18 and Anion Exchange Resin Regeneration Tower
A nitrogen gas supply device 20 for supplying nitrogen gas is connected to 19. Other parts are the same as in the conventional example.

That is, a nitrogen main pipe 21 is connected to the nitrogen gas supply device 20 in the regenerator 14, and the nitrogen main pipe 21 is connected to the cation exchange resin regenerator 18 to a cation side nitrogen pipe 22.
Connect. Similarly, an anion side nitrogen pipe 23 is connected to the anion exchange resin regeneration tower 19, and a demineralizer side nitrogen pipe 24 is connected to the condensate demineralizer 9.

Therefore, in the condensate demineralizer 9 shown in FIG. 1, the condensate demineralizer 9 removed from the condensate purification system transfers the ion exchange resin to the cation exchange resin regeneration tower 18, In the ion exchange resin regeneration tower 18, the insoluble impurities are peeled and removed by the bubbling action of the nitrogen gas supplied from the nitrogen gas supply device 20 through the nitrogen main pipe 21 and the cation side nitrogen pipe 22.

After completion of the bubbling, the mixed ion exchange resin is separated by sedimentation and the anion exchange resin is transferred to the anion exchange resin regeneration tower 19. Each ion exchange resin is used in each ion exchange resin regeneration tower 18, 19 from the nitrogen gas supply device 20 to the nitrogen main pipe 21.
After removing impurities by bubbling with nitrogen gas respectively supplied through, the anion exchange resin is returned to the cation exchange resin regeneration tower 18 again.

In the cation exchange resin regeneration tower 18, the cation exchange resin and the anion exchange resin are mixed by the nitrogen gas supplied from the nitrogen gas supply device 20 and then transferred to the condensate demineralizer 9.

From the condensate storage tank 16 to the condensate makeup water pump 15
Make-up water sent via the is temporarily stored in the cation exchange resin regeneration tower 18. Make-up water is bubbled and deaerated by the nitrogen gas supplied from the nitrogen gas supply device 20 in the cation exchange resin regeneration tower 18, and is transferred as storage water in the condensate demineralizer 9.

Therefore, since the compressed air for local use and the condensate make-up water are not used directly, the oxidation deterioration of the ion exchange resin and the adsorption of carbonic acid can be reduced.

[0022]

EFFECTS OF THE INVENTION According to the present invention, since it is not necessary to perform bubbling using in-house compressed air, oxidative deterioration of the ion exchange resin by oxygen and carbon dioxide contained in in-house compressed air and ion exchange due to carbon dioxide adsorption. It is possible to prevent the capacity from decreasing.

As water used for temporary storage, deaerated water from which oxygen and carbon dioxide contained in the condensate replenishing water have been discharged can be used because nitrogen gas bubbling is performed in the cation exchange resin regeneration tower.

Furthermore, it is possible to prevent the deterioration of the ion exchange resin due to oxidative deterioration and the adsorption of carbonic acid, and to reduce the frequency of regeneration of the ion exchange resin. Moreover, since the life of the ion exchange resin is extended, the amount of radioactive waste generated can be reduced.

[Brief description of drawings]

FIG. 1 is a system diagram showing an embodiment of a condensate demineralizer according to the present invention.

FIG. 2 is a system diagram showing a conventional condensate demineralizer.

[Explanation of symbols]

1 ... Reactor pressure vessel, 2 ... Main steam pipe, 3 ... Turbine, 4
… Condenser, 5… Low pressure condensate pump, 6… Air extractor, 7…
Steam condenser, 8 ... Condensate filter, 9 ... Condensate demineralizer, 10 ... High pressure condensate pump, 11 ... Low pressure feed water heater, 12 ... Water feed pump,
13 ... High-pressure feed water heater, 14 ... Regeneration device, 15 ... Condensate make-up water pump, 16 ... Condensed water storage tank, 17 ... Compressed air piping for internal use,
18 ... Cation exchange resin regeneration tower, 19 ... Anion exchange resin regeneration tower, 20 ... Nitrogen gas supply device, 21 ... Nitrogen main pipe, 22 ... Cation side nitrogen pipe, 23 ... Anion side nitrogen pipe, 24 ... Desorption Nitrogen piping on the salt container side.

Claims (1)

[Claims] 1. A condensate demineralizer for removing soluble impurities contained in condensate condensed in a condenser, and a cation exchange resin for regenerating the ion exchange resin in the condensate demineralizer. In a condensate demineralizer equipped with a regenerator and a regenerator having an anion exchange resin regenerator, a nitrogen gas supply for introducing nitrogen gas into the cation exchange resin regenerator and anion exchange resin regenerator of the regenerator A condensate demineralizer, characterized by being connected to a device.