Regeneration of Condensate Polishing Resins for Fossil Power Stations:Utility Requirements and Comments on Possible Regeneration Procedures

摘要

The regeneration of ion exchange resins used in deep bed condensate polishing plants on fossil power stations is normally performed on-site by power station personnel.The use of specialist contractors to perform similar functions on other water treatment plants has in recent years become more widespread.Electric Power Research Institute is interested in the use of offsite regeneration of polisher resins as it could reduce the capital cost of condensate polishing plants and may possibly have other benefits for some fossil power stations.One large utility in the U.S.A.has already adopted the approach and others are showing interest.In this paper consideration is given to the necessary quality to which resins should be regenerated by specialist contractors so as to ensure satisfactory performance when in service.It is recognized that the two commonly used modes of operation of condensate polishing,the conventional H-OH mode and ammonium form operation,have different requirements.The suggested limits for the ionic impurity content of the resins,i.e.,for sodium chloride and sulfate,therefore cover both modes of operation.Possible procedures that supplement conventional regeneration processes are also described and discussed.