The denitrification principle

basic structure

and effectiveness in application of hybrid denitrification techonology SNCR SCR on 410 t/h coal-fired boiler in one power plant have been presented

the problems occurred in operation

such as corrosion of water-wall below spraying hole of carbamide solution

deposit of slags in water-cooled ash hopper

and non-uniform distribution of ammonia etc.

being analysed

and preventive measures being adopted.Results of test show that the denitrification efficiency of said hybrid denitrification techonology is greater than 80% under condition of NOx concentration being 247~318 mg/m3

and the escape of zmmonia isn't greater than 5 μL/L.