Thermal power plants need to ravel out how to ensure the safe and economic operation and control of condensate polishing plants(CPP).Two condensate polishing treatment devices were taken as the research objects to investigate their operation and control modes.The field test results showed that

the hydrogen conductivity value of the effluent of single polishing mixed bed was not sensitive to the change of the impurity irons concentration

while it was affected by the resin regeneration degree.Due to the large variation

the hydrogen conductivity was suitable to be regarded as the index for mixed bed control

and its value should be determined via test to accurately reflect the control situation of the single polishing mixed bed.Considering of reducing the operation risk and regeneration difficulty

the failure index should not be set too high.