N2O FORMATION DURING FLUIDIZED-BED COMBUSTION OF CHARS

Experimental studies were carried out with an 80 mm i.d. fluidized bed combustor over the temperature range 700-950-degrees-C to determine the amounts of N2O formed during the combustion of different chars as well as the heterogeneous reactions involving char and N2O leading to the reduction of the latter. The results suggest that the combustion of volatiles contributes more to the formation of N2O, as the N2O levels measured were approximately 40% of that observed during the combustion of the parent coal. The study also demonstrated the significant reactivity of char with respect to N2O, as greater-than-or-equal-to 90% of the inlet N2O concentration was adsorbed.