SNCR and SCR unite denitrification facility for CFB boiler

The utility model discloses a SNCR and SCR unite denitrification facility for CFB boiler comprises consecutive cyclone, afterbody flue, economizer and air heater, be equipped with the first layer spray gun with the afterbody flue in the pipeline that cyclone links to each other, be equipped with second floor spray gun in the afterbody flue, be equipped with the catalyst device in the pipeline between economizer and the air heater. The utility model has the advantages that: messenger denitration efficiency reaches 70%-90%, ensures NOx discharge to reach standard, and the escape of final ammonia is less than 3ppm, and the production of ammonium hydrogen sulfate is low than SCR, causes jam or erosive probability lower than SCR, and the loss of pressure of production is lower with change catalyst cost.