A hydrodynamic model for biomass gasification in a circulating fluidized bed riser

摘要: This study presents a three-dimensional Computational Fluid Dynamic (CFD) model and experimental measurements of the hydrodynamics in riser section Circulating Fluidized Bed (CFB) biomass gasifier consisting binary mixture polydisperse particles. The is based on multi-fluid (Eulerian-Eulerian) approach with constitutive equations adopted from Kinetic Theory Granular Flow (KTGF). first an assessment various options closure for followed by sensitivity analysis to solution time step, cell size, turbulence alternative formulations granular energy equation. Accordingly, robust reliable hydrodynamic recommended validated using conventional pressure Positron Emission Particle Tracking (PEPT) technique. Furthermore, predictions experiments revealed evidence particle re-circulation within lower part riser, which important feature contributing rapid mass heat transfer CFB gasifier. present can be further developed; incorporating appropriate reactions equations, order fully predict performance products