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 technology provides basis for analyzing the problems occur during SCR device running and formulating catalyst replacement strategy scientifically

which is also applicable for SCR equipments in other types of units.