Kinetic Analyses of Gasification and Combustion Reactions of Carbonaceous Feedstocks for a Hybrid Solar/Autothermal Gasification Process To Continuously Produce Synthesis Gas

摘要

A hybrid solar/autothermal steam gasification process to continuously produce synthesis gas from carbonaceous feedstocks is considered. Langmuir-Hinshelwood-type reaction mechanisms for gasification with CO2 and H2O(v) and combustion were used with non-isothermal thermogravimetry to determine kinetic parameters for three feedstocks: (1) activated charcoal, (2) bituminous coal char, and (3) miscanthus char. Temperature ranges of 550-960 and 1120-1270 K and concentrations of 10-40% O-2-Ar and 20-100% H2O-CO2 were evaluated for combustion and gasification, respectively. Carbonaceous feedstock microstructures were examined using scanning electron microscopy. Surface area and porosity were characterized using Brunauer-Emmett-Teller analysis.