JP2000140839A - Desalting device of condensate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To rapidly and safely transfer ion exchange resin to a desalting column by providing a transfer line capable of directly transferring the ion exchange resin between the desalting column and the outside of a desalting device system of condensate, on the desalting device of the condensate having the desalting column filled the ion exchange resin in the inside. SOLUTION: The ion exchange resin is filled in the desalting column 2 of the desalting device 1 of the condensate, and returned water introduced from a returned water inlet piping 3 is purified, then is returned from a condensate outlet piping 4 into a power station system. In the desalting column 2, returned water from a condenser 8 into which sea water is passed from a sea water line 7 as cooling water, is fed via a condensate filter 9. In this case, when the used resin in the desalting column 2 is abandanened, a condensate inlet valve 5 and a condensate outlet valve 6 are respectively closed and also a desalting column resin take-out valve 12 and a direct discharge valve 25 are respectively opened, then the used resin is directly transferred from the desalting column 2 to a waste resin storage tank 17 through a resin direct disposal line 24.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a condensate desalination apparatus and, more particularly, to a boiling water nuclear power plant (hereinafter abbreviated as a BWR type nuclear power plant) which performs non-regeneration operation of an ion exchange resin. It relates to a suitable condensate desalination apparatus.

[0002]

2. Description of the Related Art In a nuclear power plant, a condensate desalination apparatus purifies impurities (mainly ionic substances) in condensate condensed by a condenser in a condensate desalination tower filled with an ion exchange resin. It is installed to maintain the purity of the water supply to the reactor below a specified value.

[0003] This condensate desalination apparatus is usually constituted by the following two systems. Desalination system: A system that purifies condensate with ion exchange resin in a desalination tower. Regeneration system: When the conductivity at the outlet of the desalination tower, the flow rate of each tower and the differential pressure between the inlet and outlet pipes of the condensate demineralizer reach the specified values, transfer the ion exchange resin of the desalination tower to the regeneration system, A system that performs cleaning or chemical regeneration. The regenerated resin is returned to the desalination tower again and returned to the system.

Meanwhile, in recent BWR-type nuclear power plants, the concentration of ionic impurities in condensate is low, and almost all plants are equipped with a condensate filter and a condensate desalination unit in series. Since the load of the clad component applied to the condensate desalination unit is extremely small because it is filtered in advance in a vessel,
Most plants employ non-regenerative operation without regenerating or backwashing the ion exchange resin. In other words, this is an operation method in which when the ion exchange resin reaches the end of its life, it is replaced with a new resin without regenerating it. In a plant that performs such non-regeneration operation, the regeneration system is operated for receiving a new resin or temporarily storing the resin at the time of regular inspection.

Recently, a non-regenerative operation type condensate desalination apparatus without a chemical regenerating facility is also being planned, and the desalination tower is used for receiving a new resin or temporarily storing the resin during regular inspection. A configuration in which an external tower having a capacity capable of receiving all of the resin is installed is also being planned.

Under such circumstances, the disposal of used ion exchange resin and the acceptance of new resin in a nuclear power plant are performed in a system configuration as shown in FIG. 4, for example.

In FIG. 4, reference numeral 101 denotes a plurality of desalination towers arranged in parallel in the condensate treatment system. Each of the desalination towers 101 is filled with an ion exchange resin and supplied from a condensate inlet pipe 102. After the condensate is purified, the condensate outlet pipe 10
It is returned to the system of the nuclear power plant via 3. Desalination tower 10
1, the condensate inlet valve 104 and the condensate outlet valve 105 are closed to isolate the target desalination tower 101, and then the desalination tower resin outlet valve 106 and the resin inlet valve. 107 is opened, and the resin in the desalination tower 101 is regenerated by water and air from a makeup water line and an air line (not shown) through a resin extraction pipe 108.
(Usually, at least two columns are provided to separate and regenerate the anion exchange resin and the cation exchange resin.)
(Or, if an external tower is provided for temporary storage as described above, transfer to the external tower is also conceivable). After closing the desalination tower resin outlet valve 106 and the resin inlet valve 107, open the waste resin outlet valve 110,
The resin in the tower 109 outside the system for the condensate desalination system as described above is transferred to an external device such as a waste resin storage tank through the waste resin transfer pipe 111 by water and air from a makeup water line and an air line (not shown). Transfer to complete resin disposal.

[0008] New resin receiving valve, new resin receiving valve 1
12 is opened, and the new resin is received into the tower 109 outside the system using an ejector or a slurry pump via the new resin transfer line 113. The new resin receiving valve 112 is closed, the resin outlet valve 114 and the desalting tower resin inlet valve 116 are opened, and water and air from a makeup water line and an air line (not shown) are supplied to the outside of the system via a resin feed line 115. The new resin is transferred from the tower 109 to the desalination tower 101. After closing the resin outlet valve 114 and the desalination tower resin inlet valve 116, the condensate inlet valve 104 and the condensate outlet valve 105
And restart the condensate flow.

[0009]

However, in the conventional method as shown in FIG. 4, the time required for discarding the used ion exchange resin and receiving the new resin is long.
There is a problem that a long stoppage is required until the operation resumes. In addition, water used for transporting used resin and water and liquid used for backwashing and regenerating ion-exchange resin must all be treated as radioactive waste liquid, but the amount of radioactive waste liquid generated is large. is there.

That is, the used resin generated in the condensate desalination apparatus is received in the tower 109 outside the system by the resin take-out pipe 108, and then is discarded in the waste resin storage tank of the radioactive waste treatment facility. It is necessary to carry out resin transfer twice from a salt tower to a tower outside the system and a tower outside the system to a waste resin storage tank. Therefore, the time required for resin disposal becomes longer, and the amount of radioactive waste liquid generated also increases.

Also, when receiving the new resin, the new resin cannot be supplied until the used resin is disposed of, and the new resin is once received in the tower 109 outside the system and then transferred to the desalination tower 101. To transfer the resin, it is necessary to perform the resin transfer twice, and the time for isolating the desalination tower 101 becomes longer.

Particularly, in a plant that performs non-regeneration operation, when seawater used for cooling in a condenser disposed on the upstream side leaks, the ion load on the ion-exchange resin due to the occurrence of seawater leak increases. In such a case, it is necessary to urgently replace the resin with a new resin during the operation of the plant. In such a case, it is necessary to exchange the resin while treating the condensate, and it is necessary to shorten the isolation time of the desalination tower as much as possible. However, it is difficult for the conventional transfer method to sufficiently meet the demand. Met.

[0013] Therefore, an object of the present invention is to transfer the ion exchange resin from or to the desalination tower when the ion exchange resin needs to be temporarily stored for exchange, backwashing, regeneration, and the like. It is an object of the present invention to provide a condensate desalination apparatus which can rapidly perform the process in a short time and can reduce the amount of radioactive waste liquid by reducing the amount of water used for transportation and the like.

[0014]

In order to solve the above problems, a condensate desalination apparatus according to the present invention is provided in a condensate desalination apparatus having a desalination tower filled with an ion exchange resin. A transfer line capable of directly transferring the ion exchange resin between the tower and the outside of the condensate desalination system is provided.

[0015] Such a condensate desalination apparatus has an external tower capable of receiving the ion exchange resin in the desalination tower,
The above-mentioned transfer line may be configured to directly connect the desalination tower and the outside of the condensate desalination system by bypassing the external system tower. As the out-of-system column, a column having a capacity capable of accepting at least the entire amount of the ion exchange resin for one demineralization column is preferable, and at least one column may be provided.

In the present invention, the term "condensate desalination system" refers to a system including a desalination tower, an out-of-system tower, and a pipe connecting between the two. The “outside” refers to a facility for disposing and storing used ion exchange resin and a facility for supplying new ion exchange resin.

Accordingly, the transfer line can be configured as a line for directly discarding the used ion exchange resin from the desalting tower to a waste resin storage facility (for example, a storage tank) outside the system. Alternatively, the transfer line can be configured as a line for directly feeding new resin from a new ion exchange resin supply facility to a desalination tower. Further, the transfer line may be configured to include both a line for directly discarding the used ion exchange resin from the desalination tower and a line for directly feeding the new ion exchange resin to the desalination tower.

Such a condensate desalination apparatus is suitable for a system in which a condensate filter is provided on the upstream side of the condensate water flow system and the load on the condensate desalination apparatus is small, such as cladding. In particular,
It is suitable for use in a BWR-type nuclear power plant in which non-regeneration operation of ion exchange resin is performed.

In the condensate desalination apparatus according to the present invention as described above, when the used ion exchange resin is discarded, it is once sent to an external column as in the conventional method, and then sent to a disposal facility. Since it is not necessary to perform two transfer operations and the wastewater can be discarded directly from the desalination tower via the transfer line, the time required for resin transfer is greatly reduced, and the amount of water required for transfer is also significantly reduced.

Also, when the new ion exchange resin is received, it is not necessary to perform the two-time transfer operation for once receiving the new ion-exchange resin into the external column and sending it to the desalination column as in the conventional method. The new resin can be fed directly to the desalination tower via the above, so that the time required for feeding the resin is greatly reduced and the amount of water required for the transfer is also greatly reduced.

If both a direct disposal line for the used ion exchange resin and a direct feed line for directly receiving the new resin are provided, the time required for the exchange of the ion exchange resin is further reduced, and the amount of water required for the transfer is reduced. Is further reduced.

As a result of shortening the time required for transferring and exchanging the ion exchange resin, it is possible to cope with urgent resin exchange and the like even in the non-regeneration operation system of the ion exchange resin. In addition, as a result of reducing the amount of water required for transportation and the like, the load on the water supply equipment is reduced, and the amount of radioactive waste liquid generated is also reduced, so the load on the radioactive waste liquid treatment system is also reduced. .

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a condensate desalination apparatus according to a first embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a condensate desalination apparatus in which a plurality of desalination towers 2 are arranged in parallel in a condensate system. And the condensate introduced from the condensate inlet pipe 3 is purified, and the treated condensate is returned to the power plant system via the condensate outlet pipe 4. The condensate inlet pipe 3 is provided with a condensate inlet valve 5, and the condensate outlet pipe 4 is provided with a condensate outlet valve 6. On the upstream side, a condenser 8 through which seawater flows from the seawater line 7 as cooling water and a condenser filter 9 are connected in series, and the condensate from the condenser 8 is condensed. After the impurities such as the clad are filtered and removed by the water filter 9, the impurities are sent to each desalting tower 2. This embodiment is particularly shown as a system of a non-regenerative nuclear power plant which does not perform chemical regeneration of the ion exchange resin.

A resin extraction pipe 10 is connected to each of the desalination towers 2. In this embodiment, the extraction pipe 10 is capable of receiving at least one ion-exchange resin of at least one of the desalination towers 2. It is connected to an external tower 11 having a capacity. The out-of-system tower 11 is configured to be usable, for example, for temporarily storing the ion-exchange resin at the time of regular inspection of the desalination tower 2 and for backwashing the resin taken out. The resin outlet pipe 10 is provided with a resin outlet valve 12 and a resin inlet valve 13 for the desalination tower.

A waste resin transfer pipe 16 having a resin outlet valve 14 and a waste resin outlet valve 15 is connected to the external system tower 11 in the same manner as in the prior art. Also, the resin can be transferred to the waste resin storage tank 17.

From the new resin supply equipment 18, new ion exchange resin can be supplied to the external tower 11 through the new resin transfer pipe 19 via the new resin receiving valve 20. In this embodiment, the transfer pipe 19 joins with the resin take-out pipe 10 immediately before the entrance to the out-of-system tower 11.

The waste resin transfer pipe 16 is branched on the way.
A resin supply pipe 21 connected to the desalination tower 2 is provided, and the resin supply pipe 21 is provided with a resin outlet valve 22 and a desalination tower resin inlet valve 23. Via this resin supply pipe 21, a new ion exchange resin or an ion exchange resin subjected to a treatment such as backwashing is sent from the out-of-system tower 11 to the desalination tower 2.

The system configured as described above is provided with a transfer line capable of directly transferring the ion exchange resin between the desalination tower 2 and the outside of the condensate desalination system. In the present embodiment, the direct transfer line for the ion exchange resin is provided as a line for directly discarding the used ion exchange resin in the desalination tower 2 by bypassing the out-of-system tower 11, and branching off the resin extraction pipe 10 in the middle. Then, it is provided as a line 24 that is directly connected to the waste resin storage tank 17. The resin direct disposal line 24 is provided with a direct disposal valve 25.

In the condensate desalination apparatus 1 configured as described above, the used resin is discarded at the time of ion exchange resin exchange in the desalination tower 2 as follows. The desalting tower inlet valve 5 and the desalting tower outlet valve 6 are closed, the desalting tower resin take-out valve 12 and the direct disposal valve 25 are opened, and the resin direct disposal line is provided by water and air from a makeup water line and an air line (not shown). The used resin can be directly transferred from the desalting tower 2 to the waste resin storage tank 17 via the tank 24.

Since the used ion exchange resin can be directly discarded without being once stored in the out-of-system tower 11 unlike the conventional method, the time required for discarding is greatly reduced. Also,
The amount of water required to transfer the resin at the time of disposal is greatly reduced, and the amount of waste liquid that must be treated as a radioactive waste liquid due to its use is also significantly reduced. Therefore, the time required for replacing the ion exchange resin is significantly reduced, and the load on the radioactive waste liquid treatment system is also significantly reduced.

FIG. 2 shows a condensate desalination apparatus 31 according to a second embodiment of the present invention.
Instead of being provided with 4, a new resin direct feed line 32 for directly receiving a new ion exchange resin is provided. The new resin direct feed line 32 is connected in the middle of the resin feed pipe 21 so as to bypass the external tower 11. The direct feed line 32 is provided with a direct receiving valve 33. Other configurations are the same as those in the first embodiment, and the description is omitted by attaching the same reference numerals as those shown in FIG.

In the thus-constructed condensate desalination apparatus 31, by opening the direct receiving valve 33 and the desalination tower resin inlet valve 23, the new ion-exchange resin from the new resin supply equipment 18 is supplied directly to the new resin. It is fed directly to the desalination tower 2 via the feed line 32 and the resin feed pipe 21.

Since the new ion exchange resin is directly sent to the desalination tower 2 without being once stored in the out-of-system column 11 as in the conventional method, the time required for receiving the new resin is greatly reduced. Further, the amount of water required for feeding the resin is also reduced. Therefore, the time required for replacing the ion exchange resin is significantly reduced, and the load on the water supply equipment is also reduced.

FIG. 3 shows a condensate desalination apparatus 41 according to a third embodiment of the present invention. This embodiment is similar to the first embodiment described above.
In this embodiment, both the configuration according to the embodiment and the configuration according to the second embodiment are implemented, and both the resin direct disposal line 24 and the new resin direct supply line 32 are provided. Each line 24, 3
Since the configuration of 2 and other configurations are in accordance with the first embodiment and the second embodiment, the description of the specific configuration will be omitted by attaching the same reference numerals as those shown in FIGS.

In the condensate desalination apparatus 41 configured as described above, the number of times of resin transfer accompanying resin disposal and new resin reception is minimized, and the amount of water required for transfer is also minimized. Therefore, the time required for replacing the ion exchange resin is minimized, and the amount of radioactive waste liquid generated is also minimized.

In each of the above embodiments, for example, when the ion exchange resin in the desalting tower 2 is simply stored temporarily or used again by backwashing or the like, it is transferred to the out-of-system tower 11 as in the conventional method. Then, after being temporarily stored or subjected to necessary treatment, it can be returned to the desalination tower 2.

In each of the above embodiments, the non-reproduction operation B
Although the example applied to the WR type nuclear power plant was explained,
The present invention is not limited to this, and can be applied to any type of condensate desalination apparatus in which the ion exchange resin in the desalination tower needs to be discarded or a new resin needs to be received.

[0038]

As described above, according to the condensate desalination apparatus of the present invention, the time required for disposal of used ion exchange resin and / or acceptance of new resin can be greatly reduced, and in the case of emergency, etc. It is possible to quickly respond to the exchange of the ion exchange resin in the above. Further, since the amount of water required for transferring the resin can be greatly reduced, the load on the radioactive waste liquid treatment system can be reduced.

[Brief description of the drawings]

FIG. 1 is a system diagram of a condensate desalination apparatus according to a first embodiment of the present invention.

FIG. 2 is an equipment system diagram of a condensate desalination apparatus according to a second embodiment of the present invention.

FIG. 3 is an equipment system diagram of a condensate desalination apparatus according to a third embodiment of the present invention.

FIG. 4 is an equipment system diagram of a conventional condensate desalination apparatus.

[Explanation of symbols]

 1, 31, 41 Condensate desalination device 2 Desalination tower 3 Condensate inlet pipe 4 Condensate outlet pipe 5 Condensate inlet valve 6 Condensate outlet valve 7 Seawater line 8 Condenser 9 Condensate filter 10 Resin take-off pipe 11 Outer system tower 12 Desalination tower resin outlet valve 13 Resin inlet valve 14 Resin outlet valve 15 Waste resin outlet valve 16 Waste resin transfer pipe 17 Waste resin storage tank 18 New resin supply equipment 19 New resin transfer pipe 20 New resin receiving valve 21 Resin feed pipe 22 Resin outlet valve 23 Desalination tower resin inlet valve 24 Resin direct disposal line 25 Direct disposal valve 32 New resin direct supply line 33 Direct receiving valve

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G21F 9/12 512 G21C 19/30 C

Claims (7)

[Claims] An ion-exchange resin can be directly transferred between a desalination tower and the outside of a condensate-desalination system to a condensate desalination apparatus having a desalination tower filled with an ion-exchange resin. A condensate desalination apparatus comprising a transfer line. 2. An external system capable of receiving an ion exchange resin in a desalination tower, wherein the transfer line bypasses the external system tower and connects the desalination tower and the outside of a condensate desalination system. The condensate desalination apparatus according to claim 1, which is directly connected. 3. The condensate desalination apparatus according to claim 1, wherein the transfer line is a line for directly discarding the used ion exchange resin from the desalination tower. 4. The transfer line according to claim 1, wherein the transfer line is a line for directly feeding the new ion exchange resin to the desalination tower.
Condensing desalination equipment. 5. The transfer line includes both a line for directly discarding used ion exchange resin from a desalination tower and a line for directly feeding new ion exchange resin to a desalination tower.
The condensate desalination apparatus according to claim 1 or 2. 6. The condensate desalination apparatus according to claim 1, wherein a condensate filter is provided on an upstream side with respect to the condensate water flow system. 7. The condensate desalination apparatus according to claim 1, which is used for a boiling water nuclear power plant.