A system connecting cation bed and anion bed in series for condensate polishing treatment was used for 2×300 MW direct air-cooled units in one power plant

the main problems existing in operation of said system are as follows:(1)in the initial period of putting cation bed and anion bed into operation

contaminant ion leakage had occurred in the effluent water;in case of cation bed is in operation according to ammonium type

chlorine ion leakage appeared in effluent water from the anion bed.For this

improvement scheme has been put forward after discuss and analysis in the following:(1)enhancing regenerative level of the resins;(2)sufficiently positive cleaning

after the end of flushing resin in the storage tank

the conductivity of effluent water should be less than 1 μS/cm;(3)designing reasonable cyclic flushing system for initial period of putting cation bed and anion bed into operation

and reasonably arrange the manipulation of putting them into operation.After implementation of the improvement scheme

the ion leakage problem existing in original system has been basically solved.