Feasibility evaluation on direct liquefaction of No.3-1 coalseam from No.3 Open-pit Mine in Baiyinhua Coalfield

In order to research the relationship between the direct liquefaction feasibility of lignite in Baiyinhua Coalfield and coal macerals and coal quality parameters, the samples were collected and tested from No. 3-1 coal seam in No.3 Open-pit Mine.In combination with the former researchers’ results of coal macerals and coal quality indexes, this paper discussed the effects of inertinite content, ash, volatile content and H/C ratio on direct liquefaction. The results showed that the low inertinite content, low ash content, high volatile content, and high H/C atomic ratio of lignite were favorable for direct liquefaction. The No.3-1 coal seam had a lower content of inertinite, which was less than 8.70%, most of coal ash content of clean coal was less than 10%, volatile matter content was greater than 35%,most H/C atomic ratio was greater than 0.75. Based on the comprehensive analysis, all parameters of No.3-1 coal seam met the requirements of direct liquefaction index and could be used as an ideal direct liquefaction raw material.