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 t he amounts of N2O formed during the combustion of different chars as w ell as the heterogeneous reactions involving char and N2O leading to t he 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 combustio n of the parent coal. The study also demonstrated the significant reac tivity of char with respect to N2O, as greater-than-or-equal-to 90% of the inlet N2O concentration was adsorbed.