Abstract
A unique SNCR system by excited ammonia injection using an intermittent dielectric barrier discharge (DBD) has been developed to remove NOx from an incinerator. However, the NOx reduction mechanisms are not elucidated so far.. In this paper, nitric oxides formation was investigated in excited NH_3-O_2-N_2 system. Hydrogen concentrations at the plasma reactor and NOx concentrations at the reactor exit were measured to characterize chemical species generated by DBD. Hydrogen concentrations were increased with an increase of the applied voltage and residence time of NH_3/Ar gas mixture in the plasma reactor. In oxidation of excited NH_3, NOx was generated above temperature of 600℃. Behavior of NOx formation in experiments was compared with calculation results by elementary reaction analysis based on Miller & Bowman mechanism.
