LoyYang褐煤热解过程中HCN和NH3形成的主要影响因素

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 NH 3 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 NH 3 remained almost unchanged, indicating that HCN was not significantly converted to NH 3. The effects of coal feed rate on HCN yields were different at the temperature of 973?K and 1073?K.