IMPROVEMENT OF WATER TREATMENT TECHNOLOGY IN THERMAL POWER PLANTS

WAVKKG

Abstract

The development of an effective water treatment system at a CHP plant is based on the implementation of water treatment in several stages, the first stage is the removal of suspensions and colloidal impurities, partial disinfection and discoloration. At the second stage, a more subtle purification from dissolved impurities occurs by membrane, ion exchange, methods, magnetic treatment and others. The choice of a specific pre-preparation method is based on the specifics of production and the requirements imposed on it.

The scheme of desalination of boiler water of a coke-chemical enterprise, where ion exchange is currently used, is considered. At the pre-purification stage, the water is clarified using coagulant and lime milk, after which it is filtered through carbon filters. Next, the water is supplied to the desalination plant by ion exchange to N-cationite and OH-anionite filters, between which a decarbonizer is located to remove carbon dioxide.

It is proposed to replace the first stage of ion exchange filters with a membrane nanofiltration unit, which will allow the removal of dissolved carbon dioxide from the water, as a consequence, to exclude the decarbonizer from the scheme. The use of nanofiltration followed by ion exchange aftertreatment increases the ion exchange filter cycle of the second stage, which reduces the consumption of reagents for ionite regeneration, the amount of washing water and reduces the cost of reagent farming