(513m) CFD Model Investigation of Syngas Production Process through Chemical Looping Gasification of Biomass in Fluidized Bed Reactor

Chemical looping gasification as an integrated technology in energy conversion of biomass fuel is a promising route for producing syntheses gasses (H₂ and CO) from carbonaceous feedstocks with a very low energy penalty and cost. In this work, Eulerian multicomponent multiphase flow simulation is carried out to investigate the performance of CLG system in bubbling fluidized bed (BFB) reactor using iron-based oxygen carrier as partial combustion oxygen provider and biomass as dispersed solid fuel. The kinetic theory of granular particle is applied to evaluate constitutive properties of the solid phase of granular flow. Chemical kinetics of biomass pyrolysis, char gasification, and metal oxide reduction along with drag coefficients model are employed to consider the effects of homogenous and heterogeneous reactions, heat, and momentum exchanges between gases and solid particles. The predicted time averaged outlet concentrations of gas components agree well with the experimental data from the literature. The impact of operation temperature, biomass particle size and gasifying agent flow on gas products during the CLG process are evaluated.