Thermal and catalytic upgrading of tarry fuel gases

摘要

The economy of the gas treatment of crude gases from gasification and pyrolysis of solid fuels could be improved by converting all the organic constituents (e.g. naphthalene) into CO and H_2 instead of their costly separation. As a contribution to the development of such a process, the thermal as well as the catalytic upgrading of tarry fuel gases was studied by converting model hydrocarbons in the presence of H_2 and H_2O. The experiments of thermal conversion show that under the given reaction conditions (total pressure: 160 kPa; residence time: about 1 s) neither the soot primarily formed nor the organic cracking products like methane are completely converted by steam to CO and H_2, even at the highest temperature investigated (1400 °C). In contrast, the results of catalytic conversion indicate that the Ni-catalyst used is suitable for the upgrading of tarry fuel gases at temperatures of about 900 °C.