The design process and key points of selective non-catalytic reduction(SNCR)denitrification technology for coal-fired boilers are discussed.The results indicate that

the "temperature window" of the SNCR denitration reaction is not a fixed temperature range but differs a lot for different kinds of reducing agents

flue gas components

reducing agent concentrations and atomization properties.The division and layout of the spray gun is the core of SNCR system design.Accurate division and layout of the spray gun can realize automatic adjustment of the spray gun's parameters at different unit loads and obtain the optimum denitrafication effect.It suggests that the reducing agent high flow cycle module and the desalting water tank should be equipped

to stabilize the reducing agent flow entering into the metering module and attenuate the water pressure.This conclusion can provide technical supports for engineering application of the SNCR denitrification technology.