Secondary Side Water Chemistry pH Control Strategy Improvements

摘要

When selecting a pH control strategy, plant design and operation characteristics have to be carefully considered. The strategy should be tailored to the plant-specific needs and requirements. Owing to the complexity of the interrelated variables, the best way is to perform a modeling with a suitable computer code. This work investigated the possibility of complementing the classic high pH all-volatile treatment (H-AVT) by addition of an organic amine at low concentrations complementarily to ammonia dosing to locally increase the pH in the water phase of the wet steam areas to counteract flow-assisted corrosion (FAC)r Alternative conditioning scenarios were considered and calculated for comparative analysis using a computer code. The results obtained argue for the convenience of using ammonia as the main alkalizing agent whenever possible, avoiding multiple amine concepts and their associated drawbacks.