Abstract: A Victorian (Loy Yang) brown coal was pyrolysed in a novel fluidised-bed/fixed-bed reactor under a wide range of experimental conditions. The experimental data indicated that HCN originated mainly from the thermally less stable N-containing structures in the coal. Significant amounts of NH₃ could be formed after the feed of coal was stopped as a result of the slow hydrogenation of the thermally more stable N-containing structure by H radicals. In addition to temperature, gas flow rate and coal feed rate could significantly affect the formation of HCN although the yield of NH₃ remained almost unchanged, indicating that HCN was not significantly converted to NH₃. The effects of coal feed rate on HCN yields were different at the temperature of 973 K and 1073 K.

Key words:

褐煤, 热解, NO_x的前驱物, HCN, NH₃

关键词:

褐煤, 热解, NO_x的前驱物, HCN, NH₃