RELEASE OF FUEL-NITROGEN DURING THE GASIFICATION OF SHENMU COAL

摘要

The HCN and NH_3 observed simultaneously NO_x formation below 973K is a resu It of competition among the contradicting effects of O_2 for the absorption of O_2 on the N-site leads to the oxidation of the N-site and generation of H radicals on the char surface and in the gas phase, blockage of the access of the N-site by H radicals, Although O_2 does not introduce additional hydrogen into the system during coal gasification in this paper, but the high reactivity of O_2 lead to the gradual gasification of coal/char solid promote the hydrogen originally present in the coal to form H radicals required the formation of HCN and NH_3 at low temperature. The nitrogen-containing species detected during coal gasification come from the overall reaction, i.e. volatiles and coal/char solid gradual gasification. The coal's evolution different at below 973K and above 1073K. Coal char can reduce NO through heterogeneous reaction controlled by the chemical reaction of NO on the char surface at high temperature.