JPS6271591A - Condensate desalting device - Google Patents

Abstract

PURPOSE:To reduce the amt. of the liquid chemical to be used in the stage of a regeneration operation by providing a lower condensate collecting outlet pipe and lower resin outlet pipe to the bottom of a condensate desalting column and providing an upper condensate collecting outlet pipe and upper resin outlet pipe to the side part of the condensate desalting column. CONSTITUTION:This condensate desalting device is to be installed to a condensate cleaning-up installation of a nuclear power plant and is disposed respectively with a condensate inlet pipe 21 to the top of the condensate desalting column 2 in which a granular ion exchange resin 1 is housed, the upper condensate collecting outlet pipe 51 and upper resin outlet pipe 52 in the side part and the lower condensate collecting outlet pipe 23 and lower resin outlet pipe 4 in the bottom. As a result, cleaning-up is executed by the ion exchange resin in the upper part of the column 2 and the cleaned-up water is taken out of the pipe 51 in the ordinary operation stage. Only the ion exchange resin in the upper part is required to be regenerated; therefore, the amt. of the liquid chemical to be used in the regeneration operation in the ordinary operation stage can be reduced. The amt. of the waste material to be generated is eventually decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a condensate 112j3 installed in a condensate purification system equipment of a nuclear power plant. Regarding equipment.

[Technical background of the invention and its problems]

Figure 3 does not show the condensate desalination equipment installed in the condensate purification system equipment of conventional nuclear power plants. This condensate desalination device is provided in order to further improve the purity of the condensate that has been purified in the condensate filtration device installed before the condensate 1l12 salt device.

This device includes a plurality of condensate demineralization towers 2 containing granular ion exchange resins 1, and a rear V! 1
A regenerator 25 exists to regenerate the granular ion exchange resin 1 in the condensate demineralization tower 2.
It is composed of Purification is done with condensate! This is done by trapping soluble impurities with a layer of granular ion exchange resin 1 housed in the west tower. When the yield of captured impurities reaches a certain level, the condensate becomes 1112J
! ! The inflow and outflow of condensate to the tower 2 is stopped, and the tower 2 is separated from the condensate system.

The granular ion exchange 1iA fat 1 in the condensate WA salt tower 2 cut out from the condensate system is led from the lower resin outlet pipe 4 to the pipe 5, and first transferred to the cation resin regeneration tower 6. Here, the ion exchange resin 111 is backwashed and separated into a cation exchange resin and a gap ion exchange resin using air and water, and then the anion exchange resin is transferred to the anion exchange resin regeneration tower 7. In the cation resin regeneration tower 6, sulfuric acid is passed through the cation exchange resin, and in the ion exchange resin regeneration tower 7, caustic soda is passed through the ion exchange resin to restore the ion exchange capacity. After that, both resins are transferred to the resin storage tank 8,
The chemical solution is washed off and mixed, and the mixed granular ion exchange resin is returned to the condensate demineralization tower 2 through the pipe 9. The operation of restoring the ion exchange capacity of the granular ion exchange resin 1 in this manner is referred to as a regeneration operation.

The waste water containing ail generated by this regeneration operation is led to a drain strainer 11 by a waste liquid transfer capillary 10, and then transferred to a waste treatment membrane @12. After being concentrated by the concentrator, it is sent to the solidification equipment 13 and converted into f'J.

The predetermined yield at which the condensate desalination equipment is switched to the regeneration operation is determined by
The difference between the condensate demineralization tower inlet conductivity measured by the inlet conductivity meter 22 installed at the condensate outlet lower water collection pipe 23 and the outlet conductivity measured by the conductivity meter 24 installed at the condensate outlet lower water collection pipe 23 , is given by the following formula multiplied by the water flow rate of the condensate 1152 salt tower 2.

[Collection ff1l of condensate demineralization tower [μS/α・Ton] ・・・・・・(1
), F = condensate Jl 12 Ju tower flow 453 (Ton
/h) Δ t n = time Ci n = average condensate demineralization tower inlet 3 at time Δtn
# Electricity rate (μS/ax) Cout Average condensate in one hour Δtn 1112 Salt tower outlet I! Electricity rate (II S /
am) During regeneration, the cation exchange resin and anion exchange I! 41 parts fat and 11 parts each (tie(
98%) approx. 1209, caustic soda (100%) approx. 100
Use g.

Also, while such regeneration operation is being carried out, 1 liter of condensate
A reserve tower always exists for the 12-salt tower 2 and performs a plurality of purifications.

The #a water desalination device also has the function of maintaining water quality purity in the event of sudden water quality deterioration such as seawater leakage from the main condenser. Therefore, the above-mentioned regeneration operation is performed with the ion exchange capacity of the granular ion exchange resin 1 removed to some extent in order to cope with such sudden seawater leakage, and taking this into consideration, the predetermined yield is adjusted. It is determined by the formula (1) above.

Therefore, in the regeneration operation during normal operation, the regeneration operation is performed even on the resin that still has ion exchange ability, that is, the resin that does not need to be regenerated yet.

Furthermore, during this regeneration operation, the ion exchange resin housed in the condensate demineralization tower 2 is fully regenerated.

By the way, since the chemical solution m used during the regeneration operation is determined by the total amount of ion exchange resin, a larger amount of chemical solution than necessary is required in order to regenerate all the ion exchange resins. As a result, the amount of recycled waste liquid increases, and a large amount of waste is generated from the nuclear power plant.

(Object of the Invention) The present invention has been made in view of the above problems, and aims to reduce the amount of chemical solution used in regeneration operations to reduce the amount of regeneration waste liquid, thereby reducing the amount of waste generated from nuclear power plants. It is an object of the present invention to provide a condensate 1112 salt device that can reduce the amount of generated salt.

[Summary of the invention]

In order to achieve the above object, the condensate desalination device according to the present invention is provided with a condensate inlet pipe at the top of the condensate desalination device in which granular ion exchange resin is housed, and a condensate outlet pipe at the side. A water collection pipe and an upper resin outlet pipe are provided, and a condensate outlet lower water collection pipe and a lower resin outlet pipe are provided at the bottom,
During normal operation, the condensate is purified through the condensate water collecting pipe, and the granular ion exchange resin is taken out from the upper resin outlet pipe and re-operated, and in the event of a sudden deterioration in water quality, the condensate is purified through the condensate outlet at the bottom. Condensate is introduced from the lower water collection pipe for purification, and granular ion exchange resin is taken out from the lower resin outlet pipe for regeneration.

[Embodiments of the invention]

An embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. Although it was briefly explained in the above [Technical Background of the Invention and its Problems], it will be explained in more detail starting from the schematic system of a nuclear power plant in FIG. 2.

High-temperature, high-pressure steam generated in the nuclear reactor 31 is sent to the turbine 32, where it performs work and drives the generator 133. The steam that has performed work in the turbine 32 is cooled by seawater in the main condenser 34 and becomes condensed water.

Thereafter, the low-pressure condensate pump 35 sends the condensate through an air extractor 36 and a gland steam condenser 37 to a condensate purification system 38 . The condensate sent to the condensate purification system 38 has insoluble impurities and soluble impurities removed by the condensate filtration device 39, and then soluble impurities are further removed by the condensate desalination device 40. After all impurities in the condensate have been removed, the condensate is sent to a low-pressure feedwater heater 42 by a high-pressure condensate pump 41 .

After that, the water supply pump 43 and the high pressure water heater 4
4, the pressure and temperature are increased, and the fuel is refluxed to the nuclear reactor 31.

Note that the condensate filtration device 39 at the stage before the condensate desalination device 40 is pre-coated with a powdered ion exchange resin to also remove soluble impurities in the double water.

Therefore, the quality of the water entering the outlet of the condensate filtration device W139, that is, the condensate desalination device 40, has extremely high purity.

As shown in FIG. 1, this condensate desalination system [4,0] mainly consists of a condensate desalination tower 2, a resin strainer 3, and a regeneration system 25. In FIG. 1, the same parts as in the conventional example are designated by the same reference numerals and the explanation thereof will be omitted.

A condensate inlet pipe 21 for introducing condensate is provided at the top of the condensate demineralization tower 2 . A condensate outlet upper water collection pipe 51 is provided on the side of the condensate demineralization tower 2 , and is led to the resin strainer 3 via a pipe 52 .

A conductivity meter 53 is installed in this pipe 52.

Similarly, an upper resin outlet pipe 5 is provided on the side of the condensate demineralization tower 2.
4 is subjected to Hsj and guided to the cation resin regeneration tower 6 via the pipe 55. These condensate outlet upper water collection pipe 51 and upper resin outlet pipe 54 have an inner diameter of 90c1 of the condensate demineralization tower 2.
11, the internal sheets 55 to 3 in the condensate desalination bath
It is set at a position of 0 to 50 IJ.

A condensate outlet lower water collection pipe 23 is provided at the bottom of the condensate demineralization tower 2 , and this water collection pipe 23 is led to the resin strainer 3 . A conductivity meter 24 is connected to the condensate outlet lower water collection pipe 23. The conductivity meters 53 and 24 are used to monitor the quality of purified water flowing through the pipe 52 and the condensate outlet water collection pipe 23, respectively. These conductivities x+53.2
When the indicated value indicated by No. 4 is below the flow point of the ion exchange resin (the point at which the desalting ability of the ion exchange resin rapidly deteriorates), the filter sharp salt tower 2 is switched to the regeneration operation.

Also on the bottom is the bottom! IJl11 outlet pipe 4 is provided,
It is led to a cation resin regeneration tower 6 via a pipe 5.

The granular ion exchange resin 1 in the condensate demineralization tower 2 passes through the lower resin outlet pipe 4 or the upper resin outlet pipe 54 to the regeneration system 2.
Transferred to 5. When transferred from the lower resin outlet pipe 4, all 1ti of granular ion exchange resin in the condensate demineralization tower 2 is transferred from the lower resin outlet pipe 4.
When A and ia are transferred from the upper resin outlet pipe 54, the granular ion exchange resin 1A stored in the upper part of the condensate demineralization tower 2 is guided to the regeneration system 25, respectively. By selecting the resin outlet pipe in this way, it is possible to change the amount of resin transferred to the regeneration system.

Next, the effect will be explained.

At the normal speed #h, the condensate is purified by the ion exchange resin 1A in the upper part of the condensate demineralization tower 2, and flows out from the condensate outlet upper water collection pipe 51 toward the w11111 strainer 3.

At this time, the IA exchange tree W81B at the bottom of the condensate 11R salt tower 2
In order to avoid condensate flowing into the vicinity, a small amount of condensate Ffi is allowed to flow from the condensate outlet 'F section water collection pipe 23. At this time, the water quality of the condensate flowing out from the condensate outlet upper water collection pipe 51 is monitored by the conductivity a153, and when the indicated value reaches the flow-through point or below, the condensate outflow is stopped and a regeneration operation is performed. . In this regeneration operation, only the upper ion exchange resin 1A is
This is carried out in the same manner as in the past by taking out the im-developing tube 54 and transferring it to the cation resin regeneration tower 6.

In the event of a sudden deterioration of water quality such as a seawater leak, the condensate that has flowed into the condensate desalination tower 2 is purified by the entire amount of ion exchange resin stored in the condensate desalination tower 2, and then transferred to the condensate outlet lower water collection pipe 23.
It's going to be leaked. The regeneration operation performed after this purification is performed by taking out the entire ion exchange resin from the lower resin outlet pipe 4 and transferring it to the cation resin regeneration tower 6.

By doing the above, it is possible to perform the regeneration operation only on the ion exchange resin 1 that has lost its ion exchange ability. It is only necessary to regenerate the upper ion exchange resin 1A in the condensate demineralization tower 2, and compared to the conventional case of regenerating the entire ion exchange resin 1A and IB in the condensate demineralization tower 2, the regeneration chemical solution m can be significantly reduced. can be reduced. As a result, waste generation can be reduced.

In addition, in the event of seawater leakage, the entire amount of ion exchange resin stored in the condensate I2 salt tower can be used for purification as in the past, ensuring the safety of nuclear power plants. I can do it. For the ion exchange resin at the top, the ion exchange t! i! It can be used to purify to the limit of its ability.

Furthermore, during normal operation, the granules in the upper part of the condensate demineralization tower 2
(Since the A exchange resin 1Δ can be used up to the limit of its ion exchange capacity, the frequency of regeneration operations of the condensate 1112 salt tower 2 can be reduced, and the burden on the work opening can be reduced.

〔Effect of the invention〕

As shown below, in the condensate layer Jg device according to the present invention, a condensate outlet lower water collection pipe J3 and a lower resin outlet pipe are provided at the bottom of the condensate JH2 salt tower, and the condensate dewatering Since the condensate outlet upper water collecting pipe and the upper resin outlet pipe are installed on the side of the salt tower, during normal operation, the ion exchange resin in the upper part of the condensate desalination tower performs purification, and the condensate [1] Since it is only necessary to take out the purified water from the upper water collection pipe and regenerate only the ion exchange resin in the upper part, it is possible to reduce the amount of chemical liquid used in the regeneration operation during normal operation, and as a result,
The amount of waste generated can be reduced.

[Brief explanation of drawings]

Figure tA1 is a schematic diagram of a condensate desalination equipment according to an embodiment of the present invention, Figure 2 is a schematic diagram of a nuclear power plant incorporating a 1' size condensate desalination equipment, and Figure m3 is a conventional diagram. Condensate desalination bag η
FIG. 1... Ion exchange resin, 2... Condensate demineralization tower, 4...
・Lower resin outlet pipe, 21... Condensate inlet pipe, 23...
Condensate outlet lower water collection pipe, 51... condensate outlet upper water collection pipe,
54... Upper resin outlet pipe.

Claims (1)

[Scope of Claims] 1. In a condensate desalination device installed in a condensate purification system equipment of a nuclear power plant, a condensate inlet pipe is provided at the top of a condensate desalination tower containing granular ion exchange resin. 1. A condensate desalination device characterized in that a condensate outlet upper water collection pipe and an upper resin outlet pipe are provided at the side part, and a condensate outlet lower water collection pipe and a lower resin outlet pipe are provided at the bottom part. 2. The condensate desalination apparatus according to claim 1, wherein the granular ion exchange resin is taken out from the upper resin outlet pipe or the lower resin outlet pipe, thereby changing the amount of resin taken out.