摘要：Underground coal gasification (UCG) is an industrial process that provides an alternative to conventional underground mining at coal seams that are located especially deep underground. This work presents the results of an experimental study on the properties of tar that originated from underground coal gasification (UCG) trials. We investigated the effect of pyrolysis temperature, operating pressure, water influx and gasification agent injection on tar production. The results of the analysis showed that in terms of physical-chemical properties, both tars are highly different from each other, as well as from typical coal tar from a coking plant. On the basis of the decrease in the viscosity of tars, increase of the H/C ratio, and increase of the oil fractions sum and light aromatic compound content, as well the decline in the amount of residues after distillation, it was observed that as gasification progresses.
