Process Modeling of Fluidized Bed Biomass-CO2 Gasification using ASPEN Plus

Abstract Gasification is one of the most important thermochemical methods for conversion of biomass to biofuels. In this work, a comprehensive model to simulate the output performance of a bench scale atmospheric fluidized bed gasifier is developed using the ASPEN Plus process simulator. Knowledge about the chemistry and kinetics of the process obtained from experimental results in earlier parts of this study has been incorporated into the model. Different reactor configurations are used to simulate the various stages in a biomass-CO 2 gasification process. A dynamically linked FORTRAN subroutine is used to include the kinetic model for the Boudouard reaction. Results from sensitivity analysis performed on the model are compared with the experimental results using parameters like product stream yields, syngas composition, individual gas yields, and carbon conversion are compared to evaluate the validity of the model. The results are further compared to results from a thermodynamic equilibrium model to judge the credibility of using a comprehensive ASPEN model with kinetics.

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