The Implications for Condensate Purification of Operation at pH 9.6

Increasing the feedwater pH by increasing the ammonia concentration is one way of minimizing the transport of corrosion products to steam generators and also reducing the risks of erosion-corrosion of carbon and low alloy components in the secondary circuit. The increased ammonia load could cause difficulties with full-flow condensate purification plants, where the quality and quantity of treated water must be retained. Investigational work has enabled a range of possible operating options to be identified. These arise from advances in the chemistry of ion exchange processes and a consideration of relevant plant factors