The process design of non catalytic reduction reation(NCR) and the performance test results for comprehensive denitration retrofit for No.2 unit boiler in Yangzi Petrochemical Thermal Power Plant were presented.The SNCR technology consists of conducting basic condition tests and combustion simulation on the boiler before transformation

then comparing the simulation results and the basic condition tests data to correct the parameters of combustion model.The position of SNCR temperature window(950-1 050 ℃) in which the best denitration effect achieved was determined

and the arrangement scheme for 4-6 SNCR injectors was also ascertained.The perform test results showed that

the SNCR denitration rate reached over 40%

and can be up to 60% under the optimized condition.The final NOx emission concentration was lower