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DOI: 10.1615/HeatTransRes.v34.i1-2.190
14 pages

Temperature and Combustion Kinetics of Wood Pellet Char in a Fluidized Bed

G. I. Pal'chonok
Academic Scientific Complex "A. V. Luikov Heat and Mass Transfer Institute," National Academy of Sciences of Belarus, Minsk, Belarus
A. Borodulya
A. V. Luikov Heat and Mass Transfer Institute, National Academy of Sciences of Belarus, Minsk, Belarus
V. Golubeva
A. V. Luikov Heat and Mass Transfer Institute, National Academy of Sciences of Belarus, Minsk, Belarus
B. Leckner
Department of Energy Conversion, Chalmers University of Technology, S-412 96 Goteborg, Sweden
K.-M. Hansson
Chalmers University of Technology, Department of Energy Conversion, Sweden
C. Tullin
Swedish National Testing and Research Institute (SP), Sweden
J. E. Johnsson
Technical University of Denmark, Department of Chemical Engineering, Denmark

ABSTRACT

Fluidized-bed combustion of a single wood pellet was experimentally studied with a focus on the char temperature and burnout time. It is shown that 20 to 50% of the observed combustion rate is contributed by attrition depending on whethere, or not, CO escapes from the boundary layre of burns in it. The combustion rate is conrolled by por diffusion and chemical reaction. In terms of the overall kinetics, the combustion rate is controlled by the rates of both reaction and diffusion through the boundary layer.


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