平朔煤岩显微组分热解过程中HCN的生成

Three macerals, liptinite, vitrinite and inertinite separated from Pingshuo coal were used in this study. The formation of HCN during macerals pyrolysis was investigated using a quartz tube reactor at 600℃～900℃. Both the programmed heating and fast heating pyrolysis have been studied. It was found that the yield of HCN increased with pyrolysis temperature for all three macerals. The yield of HCN during vitrinite pyrolysis was the biggest among the three below 800℃, and that of liptinite was the highest at 900℃. The yields of HCN depended not only on their volatile content but also on the nitrogen functional groups in different macerals. More pyrrole-type nitrogen could form more HCN at lower temperature. The yield of HCN increased with increasing heating rate. Comparing the HCN yield at different period during pyrolysis, it could be found that most of HCN was released at the feeding period. The synergistic effect for the formation of HCN existed in the pyrolysis of acid-washed parent coal.