Nitrogen-Free Co-Gasification of Fermentation Residues

The limited usage of fermentation residues, due to increasingly stringent legal requirements, demands novel routes of utilization for these feedstocks. To the best of our knowledge, for the first time, a mixture of fermentation residues and wood chips is used as feedstock in a fixed-bed gasifier, using only O2/CO2 mixtures as gasifying agent. The maximum O2 concentration achieved was 31.6 Vol.-%. Pronounced process stability was achieved with a cold gas efficiency of about 94%, possibly due to CO2 conversion within the process. The heating value of the produced synthesis gas was 8.5 MJ/m3i.N.dry, with increased amounts of carbon monoxide and methane when compared to air-blown operations.