Abstract
An exergy analysis of maize cob gasification in a concentric tube fixed-bed reactor was conducted to define the relationship between biomass in the combustion and gasification zones. Biomass exergy was estimated based on its elemental composition, and syngas was treated as an ideal gas. The results show a linear correlation between temperature and the mass ratio in both the combustion and gasification zones. The optimum exergy efficiency was 68.2% at a mass ratio of 2. Most irreversibilities were found in the combustion zone, with 42.9 kJ/kg destroyed, compared to 33.7 kJ/kg in the gasification zone. It is concluded that the allothermal gasification of biomass in two-zone gasifiers with concentric tubes improves the syngas LHV, demonstrating good reactor performance.
Published Version
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