Theoretical model of flame propagation through dry biomass particles in a fixed bed

Abstract

A theoretical analysis of the flame propagation speed in a fixed bed of burning biomass particles is presented. This analysis is based on a situation in which the reaction front moves in the opposite direction of the gas flow through the fixed bed. For this purpose, the energy conservation equation is solved for both oxidizer gas, moving against the combustion wave and solid fuel and consequently, an analytical expression for predicting the reaction front is derived. This model can be used for determining the effects of iomass particle type, inlet air flow velocity into a fixed bed and bed porosity on the reaction front peed. Finally, the propagation rate is obtained for a specific particle composed of spruce and pine. It is declared that the estimated result from the present model for the propagation rate demonstrates the reasonable compatibility with the published experimental data. Show more