(604y) High Temperature Themochemical Processing of Biomass and Methane for Highly Selective Syngas
Hybrid, high temperature processing of biomass and natural gas for hydrogen-rich synthesis gas stretches the utilization of each feedstock for increased selectivity and yield of useable products for various downstream end-uses. Single-step processing in a high temperature non-catalytic reactor decreases overall plant complexity compared to other hybrid processes. Incorporation of novel solar-electric allothermal reactor system allows for simplified steam-only, highly endothermic reaction chemistry. Laboratory experiments agree with theoretical calculations and show a potential for H2/CO ≈ 2.0 and CO/(CO+CO2+HCs) ≥ 0.88 at the outlet of the gasifier depending on temperature and reactant ratios. The proposed process is designed to avoid CO2 production in favor of CO while maintaining high levels of H2 in the product syngas for liquid fuel/chemical synthesis. The overall process was shown to be limited by the rate of char gasification whose residence time and composition depends on the rate of pyrolysis and parent material, respectively.