산업용 보일러의 NOx저감을 위한 연소실 반응장 해석 = Analysis of Reaction in the Combustor of Industrial Boiler for Reduction of NOx

다국어 초록 (Multilingual Abstract)

Numerical analysis of reaction in the combustor has been performed to study the flow and temperature fields for the NOx reduction using SNCR(Selective Non Catalytic Reduction) technology for industrial boiler, 30tons of steam an hour with the case of full load. Recently NOx emission can be controlled through thermal reactions by using appropriate reducing chemicals, ammonia and urea etc., whose solution is sprayed into the flue gas including NOx. SNCR is an attractive method from point of view that no catalyst is required, in which NO reduced to N_2 and H_2O.
The good mixing and sufficient residence time of reducing agent are key parameter in industrial boiler for NOx reduction in this method. In this study, the flue gas flow and temperature fields are calculated in order to design the optimal SNCR system using numerical calculation. The recirculation area generated near the wall of combustor appears to be important parameter for flame stability and flue gas residence time. The calculation result of temperature profiles agree with experimental data on the cross-sectional are in at the rear of combustor. These results suggests the optimum nozzle point and angle of the chemical injection.