Analysis of tars formed during co-pyrolysis of coal and biomass at high temperature in carbon dioxide atmosphere

The study indicates that the atomic N/C and S/C ratio increases whereas H/C ratio decreases with pyrolysis temperature. The rate of variation of H/C ratio reduces as the temperature increases. The biomass content in the fuel feed seems to have an impact on the H/C ratio of the tars only at lower temperatures. That is, at lower temperatures, the higher the biomass content of the fuel, the higher the H/C ratio of the resulting tars. These observations also apply to the O/C ratio of the tar. For both switchgrass and pine sawdust, the biomass content of the fuel seems to have no influence on the nitrogen content of the tars. The distribution of sulfur in the tar is inversely proportional to the biomass percentage in the fuel. The higher the biomass content of the fuel, the lower the atomic S/C of the tars.