1995 Volume 74 Issue 4 Pages 213-220
To elucidate the effect of nitrogen functionality of coals on N2O and NOx emissions, five kinds of model compounds, such as pyridine, pyrrole and aniline, were burnt with kerosene or coal in an experimental fluidized bed having 0.16m inner diameter and 3m height.
No remarkable difference in N2O and NOx emission levels was found among the mod- el compounds in spite of the different nitrogen functionality. Furthermore, simulteneous formation of HCN and NH3, which would be of precursors respectively for N2O and NOx formation reactions, in the combustor was recognized in all of the combustion experi- ments. These results suggest the existence of the conversion reactions such as NH3 formation from HCN in the fluidized bed. The ratio of fuel-nitrogen conversion to N2O was lower in model compounds/kerosene combustion in comparison with model compounds/coal combustion, while the conversion ratio to NOx was higher in the former case.