Abstract：To investigate the influence of pulverized coal on hydrogen supplied link in direct coal liquefaction, infrared spectrum was used to analyze the chemical structure of pulverized Qingshuiying coal particles and its changes. The experimental methods such as particle size distribution,comparisons of conversion and so on were used to analyze and research. The results show that the oxidoreduction and aggregation restrict the usage of excellent performance of pulverized coal particles. Through combining the processes of ultra-fine grinding and hydrogenation reaction,the designed experiment can avoid oxidoreduction and aggregation effect. The mechanochemistry in ultra-fine grinding is used, and the pyrolysis of coal in reaction is promoted, so that the conversion of direct coal liquefaction is improved, and the requirements of direct coal liquefaction is lowered.

Keywords: ultra-fine grinding; direct coal liquefaction; oxidoreduction; aggregation; mechanochemistry