A Devolatilization Model of Woody Biomass Particle in a Fluidized Bed Reactor

• Devolatilization is an important mechanism in the gasification and pyrolysis of woody biomass, and has tobe accordingly considered in designing a gasifier. In order to describe the devolatilization process of wood particle, therehave been proposed a number of empirical correlations based on experimental data. However, the correlations are limitedto apply for various reaction conditions due to the complex nature of wood devolatilization. In this study, a simplemodel was developed for predicting the devolatilization of a wood particle in a fluidized bed reactor. The model consideredthe drying, shrinkage and heat generation of intra-particle for a spherical biomass. The influence of variousparameters such as size, initial moisture content, heat transfer coefficient, kinetic model and temperature, was investigated.The devolatilization time linearly increased with increasing initial moisture content and size of a wood particle,whereas decreases with reaction temperature. There is no significant change of results when the external heat transfercoefficient is over 300 W/m2K, and smaller particles are more sensitive to the outer heat transfer coefficient. Predictedresults from the model show a similar tendency with the experimental data from literatures within a deviation of 10%.

Ämnesord

NATURVETENSKAP  -- Geovetenskap och miljövetenskap -- Miljövetenskap (hsv//swe)

NATURAL SCIENCES  -- Earth and Related Environmental Sciences -- Environmental Sciences (hsv//eng)

Nyckelord

Devolatilization

Fluidized Bed

Pyrolysis

Woody Particle

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