NO REDUCTION BY SELECTIVE NONCATALYTIC REDUCTION USING AMMONIA-EFFECTS OF ADDITIVES

A parametric study of the nitric oxide reduction by Selective Non-Catalytic Reduction (SNCR) using ammonia as reducing agent has been performed in a semi industrial reactor over the temperature range of 973 - 1200 K. Several chemical compounds such as CH4, C2H4, C2H6, CH3OH, C2H5OH, and CO, which were used in the literature as the additives for SNCR process have been tested in this work. As a result, very high efficiencies (up to 82%) have been achieved in the optimal conditions of the classical SNCR process. The additives seem to be more effective in the NO reduction at lower temperature. These additives can induce a downward shift (up to more than 100 K) of the optimal temperature window for the reduction process and a slight decrease of the maximum NO reduction level depending on the species and the concentration of additives used.