Kinetics of the main stages of fluidized bed combustion of a wet biomass particle

摘要

The mass loss and temperature history of highly wet biomass and organic waste particles have been experimentally studied under fludized bed combustion conditions. A simplified mathematical model of the heat transfer controlled coupled drying and pyrolysis was established. Analytical solutions were obtained for a sphere, an infinite cylinder and an infinite slab. The solutions account for the difference in thermal characteristics between char and virgin dry biomass. The model gives a good representation of the measurements, provided that the thermal conductivity of the particle is used as a fitting parameter. The model was shown to be applicable to both isotropic and anisotropic biomass particles. The thermal conductivity of dry biomass and char needs further study.