Fouling of Polisher Resin with Organic Leachables,Extractables,and Chemical Additives and Recovering Kinetic Performance

摘要

For almost 50 years,the power industry has used condensate polishing to ensure high purity feedwater to once-through boilers and nuclear steam generators and,more recently,to drum-type units operated on oxygenated treatment(OT)or all volatile treatment(AVT).High purity polisher effluent is required for these types of units during both normal operation and during a condenser leak.The major challenge is to maintain polisher performance during a condenser leak when the most important determinant of polisher performance is ion exchange kinetics.If the surface of a resin bead is fouled,diffusion of an ion across the thin liquid film surrounding each resin bead may be adversely affected resulting in slower exchange kinetics and"leakage"of contaminant ions.Consequently,the introduction of chemical additives to units with condensate polishers causes concern because of the possibility of resin fouling [1].This paper discusses potential sources of polisher resin fouling and provides suggestions and data on resin cleaning techniques that have been tested in the laboratory and successfully used at power plants.Results indicate that appropriate resin cleaning may make the use of some chemical additives compatible with condensate polisher operation [2].