Abstract
A computational fluid dynamics analysis of a fluidised bed combustor fuelled by coal and biomass is performed. A discrete phase modelling approach is used to track fuel particles. Combustion is modelled using a two-mixture fraction probability density function approach. The standard k–ɛ two-phase turbulence model is used to describe the gas–solids flow. The residence time of coal particles is found to be greater than that of biomass particles. Contours of char burnout and devolatilisation are obtained and combustion is found to be quantitatively complete, and thus no significant change in combustion efficiency is found under full-load conditions. Velocity vectors are obtained and it is found that the velocity increases from the notch region towards the exit of the furnace, owing to the reduction in cross-sectional area. Heat exchange from in-bed superheater tubes to flue gases is greatest at the highest-temperature regions of the tubes.
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