Abstract

Chemicals, heat, and electricity can all be made with biomass, a renewable energy source. Biomass gasification is more environment friendly than biomass combustion because it produces less carbon dioxide (CO2) and other polluting gases (NOx and SO2). Present paper is focused on biomass gasification using fluidized bed. CFD analysis are performed in a cylindrical fluidized bed gasification chamber with a diameter of 6.6 cm and static bed height of 100 cm. The biomass inlet is located at a height of 0.73 cm with diameter of 0.75 cm; unstructured grid is chosen for the analysis. In this study 39,250 cells and 40,086 nodes are used to perform the simulations. CFD simulations are carried out to investigate the devolatization behavior of biomass. Fluent model of volatile material is modified according to the ultimate and proximate analysis of biomass. To know the effect on conversion efficiency of biomass a different equivalence ratio is considered as a process parameter in the range of 0.2 to 0.3. The stoichiometric ratio considered as 0.4 for biomass gasification. Mass fraction of species generated from partial combustion i.e. gasification.

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