Einsatzmöglichkeiten von pulverförmigen ionenaustauschern in der kondensataufbereitung

Abstract

Possible application of powdered ion exchangers in the treatment of condensate Change-over from the natural circulation boiler to the forced circulation boiler requires feed-water of the highest possible purity. As far as the make-up treatment is concerned, this has been achieved by using ion exchangers in complete desalination plants. However, this extreme purity of water cannot be maintained during the operation, since degradation in the quality of the feed-water caused by dissolved, colloidal and suspended matter takes place. To guarantee the purity of the water-vapour circulation, treatment of the condensate is required. The method of pre-coat filtration, using powdered ion exchangers, finds ever increasing application. This method became known under the name of “Powdex process” and appears to be a combination of filtration and ion exchange. The characteristics of the Wofatit powdered exchangers are explained thoroughly on the basis of laboratory experiments. Detailed information is given on the relationships between granulation, mixture ratio and pre-coat behaviour. The ion-exchange and filtration characteristics of the powdered exchangers are described comprehensively. The efficiency of the Wofatit powdered resins is shown in the light of pilot plant experiments and technical results.