A variety of problems occur during operation of the current SCR equipments,such as the large ammonia escape amount,high system resistance,ABS corrosion in air preheater and reduction in catalyst activity.Thus,by field test and catalyst performance analysis in a laboratory,performance of the SCR equipment in a 1 036 MW unit was comprehensively evaluated.After the diagnosis,suggestions like changing the SCR catalyst and transforming the ammonia spraying system were put forward.This performance diagnostic tech...