JP2010099613A - Method of cleaning ion-exchange resin in condensate demineralizer and device thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable to practice a scrubbing by the most suitable number of times depending on the content of impurities not by the previously set number of times of scrubbing, but by measuring a turbidity of a cleaning liquid which cleans a resin, and thereafter practice smoothly a resin regeneration. <P>SOLUTION: When an ion-exchange resin filling a desalination tower 2 constituting a condensate demineralizer 1 equipped in a condensed water piping system such as a power plant is regenerated, the ion-exchange resin is scrubbed (cleaned) before the ion-exchange resin is transferred to a regeneration tower 3. The turbidity of the cleaning liquid used for cleaning is measured by a turbidimeter 5, and the scrubbing of the ion-exchange resin is repeated till the turbidity turns to a reference value or less. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a cleaning technology for a condensate demineralizer installed in a condensate piping system of a power plant, and in particular, removes impurities before regenerating with chemicals when an ion exchange resin charged in a demineralizer is deteriorated. The present invention relates to a method and apparatus for cleaning an ion exchange resin in a condensate demineralizer.

  The condensate demineralizer is provided to remove metal corrosion products such as impurity ions, iron, and copper in the condensate in a condensate piping system such as a power plant. The condensate desalination apparatus is provided with a plurality of desalting towers filled with an ion exchange resin. The ion exchange resin packed in each desalting tower is composed of a mixed bed of an anion exchange resin and a cation exchange resin. When the ion exchange resin deteriorates or the exchange capacity of the resin is saturated and reaches the end of its life, the quality of the condensate to be treated cannot be maintained within a predetermined management reference value. Therefore, the resin used for a long period of time is regenerated or replenished by periodically measuring the amount of resin.

  For example, as shown in the flow chart of resin regeneration in FIG. 3, the condensate demineralizer stops the apparatus when the water flow rate reaches a constant volume, transfers the resin to the regeneration tower, performs regeneration with chemicals, and already has a storage tank. Replaced with recycled resin stored in the tower. At this time, scrubbing to remove impurities by washing the resin is performed before regeneration with chemicals. When the condensate demineralizer regenerates the resin, the amount of impurities in the boiler replenishment water varies depending on the unit start / stop pattern and normal operation, so the number of scrubbing operations is changed each time.

As a technique related to such a condensate demineralizer cleaning and regeneration method, for example, as shown in Japanese Patent Application Laid-Open No. 2005-296748 “Condensate Demineralizer and Regeneration Method” of Patent Document 1, chemical regeneration is required. The ion exchange resin can be recycled to the cation resin regeneration tower by water and / or air, and the anion resin can be regenerated by anion resin. A method for regenerating a condensate demineralizer that is directly transferred to a tower, regenerated and washed, and then returned directly to the resin layer separated by the extracted separation wall by water and / or air. Has been proposed.
JP 2005-296748 A

  However, it was difficult to judge the actual cleaning effect with the method of cleaning impurities adhering to the resin by changing the number of times the impurities in the boiler replenishing water are scrubbed during normal operation and start / stop. . The frequency of scrubbing was frequently changed due to the increased frequency of starting and stopping the unit. Therefore, there has been a problem that impurities such as cladding are not sufficiently removed from the resin in the condensate demineralizer.

  If the scrubbing process is insufficient and the resin cleaning effect is low, the resistance in the tower increases in the worst case, and the rated water flow rate may not be ensured. When the condensate demineralizer is stopped and regenerated at a constant volume, the condensate demineralizer in the water flow has a problem that the maximum water flow rate is exceeded and a malfunction due to an increase in the pressure in the tower is likely to occur.

  The present invention has been developed to solve such problems. That is, the object of the present invention is to perform scrubbing at an optimum number of times according to the content of impurities by measuring the turbidity of the cleaning solution that has washed the resin, not the number of times of scrubbing in advance. It is an object of the present invention to provide a method and apparatus for cleaning an ion exchange resin in a condensate demineralizer capable of smoothly performing resin regeneration thereafter.

  According to the method of the present invention, when the ion exchange resin packed in the demineralization tower (2) constituting the condensate demineralizer (1) installed in the condensate piping system such as a power plant is regenerated, Before transferring the ion exchange resin to the regeneration tower (3), scrub the ion exchange resin, measure the turbidity of the washed washing liquid, and scrub the ion exchange resin until the turbidity falls below the reference value. The ion-exchange resin cleaning method in the condensate demineralizer is provided.

  According to the apparatus of the present invention, there is provided a condensate demineralizer (1) equipped with a demineralization tower (2) filled with an ion exchange resin, which is installed in a condensate piping system such as a power plant. A washer (6) disposed between the tower (2) and the regeneration tower (3) for regenerating the ion exchange resin, and attached to the drainage system of the washer (6). There is provided a turbidimeter (5) for measuring the turbidity of a cleaning liquid, and a device for cleaning an ion exchange resin in a condensate demineralizer characterized by comprising:

  In the invention having the above-described configuration, scrubbing can be performed an optimum number of times when the ion exchange resin is regenerated. Forgetting to change the number of scrubbing times as in the past can be avoided, and the amount of recycled water can be reduced. Problems of the condensate demineralizer (1) due to the impurity volume can be eliminated. That is, it is possible to prevent an increase in the amount of water flow to the other desalting apparatus (1) when the apparatus is stopped.

  The method of cleaning an ion exchange resin in a condensate demineralizer according to the present invention regenerates an ion exchange resin packed in a demineralization tower constituting a condensate demineralizer installed in a condensate piping system such as a power plant. Before transferring the ion exchange resin to the regeneration tower, scrub the ion exchange resin, measure the turbidity of the washed cleaning liquid, and scrub the ion exchange resin until the turbidity falls below the reference value. It is a method of repeating.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an overall configuration diagram showing an ion exchange resin cleaning device in the condensate demineralization apparatus of the present invention. FIG. 2 is a work process flow chart for explaining a method of cleaning the ion exchange resin in the condensate demineralizer.
A condensate demineralizer 1 for carrying out the method for cleaning an ion exchange resin according to the present invention uses a condensate pump to condense condensate from a condenser installed in a thermal power plant, a nuclear power plant, etc. It is equipment that is supplied after a while. Condensate demineralized by the rice condensate demineralizer 1 is supplied to a boiler or a nuclear reactor.

  In the condensate demineralizer 1, a plurality of demineralizers 2 are arranged, and water is passed in parallel to all the demineralizers 2 during normal operation. Each desalting tower 2 is filled with a resin mixed with an anion exchange resin and a cation exchange resin called a mixed bed.

  In the condensate demineralization apparatus 1 configured in this way, when the water flow rate reaches a constant volume, the condensate demineralization apparatus 1 is stopped, the resin is extracted from the corresponding demineralization tower 2, and transferred to the regeneration tower 3 for chemicals. Play by. The regenerated resin is stored in the storage tank tower 4. At the time of replacing the resin filled in the desalting tower 2, the deteriorated resin is extracted from the desalting tower 2, transferred to the regeneration tower 3, and regenerated with chemicals. The empty desalting tower 2 is filled with the resin already stored in the storage tank tower 4 to complete the replacement.

  Between the desalting tower 2 and the regeneration tower 3, a washing machine 6 for scrubbing (washing) the ion exchange resin was disposed. The washing machine 6 removes impurities from the ion exchange resin. A turbidimeter 5 for measuring the turbidity of the cleaning liquid was attached to the drainage system of the cleaning machine 6. As this turbidimeter 5, for example, a turbidimeter used for boiler water quality monitoring or the like is used.

  When regenerating this ion exchange resin, before transferring the ion exchange resin to the regeneration tower 3, the turbidity of the cleaning liquid of this ion exchange resin is measured with a turbidimeter 5, and scrubbing is repeated until the ion exchange resin is below the reference value. Removing impurities from the ion exchange resin.

  By measuring the turbidity of the cleaning liquid after scrubbing with this turbidimeter 5, if the measured value of this turbidity is below the reference value, scrubbing is terminated. On the contrary, when the measured value of turbidity does not become the reference value or less, scrubbing is further repeated.

  Thus, since the frequency | count of scrubbing is determined based on the measurement result of the turbidimeter 5, scrubbing can be implemented by the optimal frequency | count and the amount of reclaimed water can be reduced.

  In the present invention, scrubbing can be carried out at an optimum number of times according to the content of impurities by measuring the turbidity of the cleaning solution for washing the resin, not the number of scrubbing performed in advance. As long as the method or apparatus can smoothly perform resin regeneration thereafter, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

  The method and apparatus for cleaning an ion exchange resin in the condensate demineralizer of the present invention is not limited to the condensate demineralizer provided in the condensate piping system of a thermal power plant, a nuclear power plant, etc. It can be used for a desalting apparatus.

It is a whole block diagram which shows the washing | cleaning apparatus of the ion exchange resin in the condensate desalination apparatus of this invention. It is a work process flowchart explaining the washing | cleaning method of the ion exchange resin in a condensate demineralizer. It is a work process flowchart explaining the washing | cleaning method of the conventional ion exchange resin.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Condensate demineralizer 2 Desalting tower 3 Regeneration tower 4 Storage tower 5 Turbidimeter 6 Washing machine

Claims (2)

When regenerating the ion exchange resin filled in the demineralization tower (2) constituting the condensate demineralizer (1) installed in the condensate piping system such as a power plant,
Before transferring the ion exchange resin to the regeneration tower (3), scrub the ion exchange resin,
A method for washing an ion exchange resin in a condensate demineralizer, characterized by measuring the turbidity of the washed washing liquid and repeating the scrubbing of the ion exchange resin until the turbidity falls below a reference value. A condensate demineralizer (1) equipped with a demineralization tower (2) filled with an ion exchange resin, which is installed in a condensate piping system such as a power plant,
A washing machine (6) for washing the ion exchange resin, disposed between the desalting tower (2) and the regeneration tower (3) for regenerating the ion exchange resin;
A turbidimeter (5) for measuring the turbidity of the cleaning liquid, which is attached to the drainage system of the cleaning machine (6).

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