Abstract
An Aspen Plus model of biomass gasification with different gasifying agents has been developed. Due to lack of kinetic data, the developed model is based on Gibbs free energy minimization. The main objective of this study is to study the influence of gasifying agent (pure oxygen; oxygen-enriched air and air), gasification temperature and equivalence ratio (ER) on gas composition, gas lower heating value (LHV), and energy/exergy efficiencies. The developed model was validated with experimental data which was found to be in well agreement. Increase in gasification temperature led to a significant increase in H2 content. On the other hand, an increase in ER led to a significant reduction in H2, CO, and CH4 and a significant increase in CO2. Also, a gradual downward trend of exergy efficiency (EE) was found, as ER increased from 0.15 to 0.21, while it basically kept constant as the gasification temperature was varied.
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