Modeling Moisture and Density Behaviors of Wood in Biomass Torrefaction Environments
Worldwide interests for the renewable energy are increasing due to environmental and climate changes from traditional petroleum related energy sources. To account for these social needs, ligneous biomass energy is considered as one of the environmentally friend energy solutions. The wood torrefaction process is a feasible method to improve the properties of the biomass fuel and makes the wood have low moisture, lower smoke emission and increased heating value. In this work, therefore, the moisture evaporation model which largely affects energy efficiency of ligneous biomass through moisture contents and heating value relative to its weight is studied with numerical modeling approach by analyzing the effects of torrefaction furnace temperature. The results show that the temperature and moisture fraction of wood decrease by increasing the furnace temperature. When the torrefaction temperature is lower than 423K, there were little changes of the moisture fraction in the wood. Also, it can be found that charcoal is produced more slowly when the torrefaction temperature is lower than 573K.
 Blasi, C., "Modeling and Simulation of Combustion Processes of
Charring and Non-charring Solid Fules," Progress in Energy and
Combustion Science, Vol. 19, No. 5, pp. 71-104, 1993.
 Blasi, C., "Heat, Momentum and Mass Transport through a Shrinking
Biomass Particle exposed to Thermal Radiation," Chemical Engineering
Science, Vol. 51, No. 7, pp. 1121-1132, 1996.
 Lee, C. K., Chaiken, R. F., and Singer, J. M., “Charring pyrolysis of wood
in fires by laser simulation,” Symposium on Combustion, Vol. 16, No. 1,
pp. 1459-1470, 1976.
 Morel, J. I., Amundson, N. R., and Park, S. K., “Dynamics of a Single
Particle during Char Gasification,” Chemical Engineering Science, Vol.
45, No. 2, pp. 387-401, 1990.
 Chan, W. C. R., Kelbon, M., and Krieger, B. B., "Modelling and
Experimental Verification of Physical and Chemical Processes during
Pyrolysis of a Large Biomass Particle," Fuel, Vol. 64, No. 11, pp.
 Prins, M. J., Ptasinski, K. J., and Janssen, F. J. J. G., "Torrefaction of
Wood. Part 1: Weight Loss Kinetics," Journal of Analytical and Applied
Pyrolysis, Vol. 77, No. 1, pp. 28-34, 2006.
 Turner, I., Rousset, P., Rémond, R., and Perré, P., "An Experimental and
Theoretical Investigation of the Thermal Treatment of Wood
(FagusSylvatica L.) in the Range 200-260°C," International Journal of
Heat and Mass Transfer, Vol. 53, No. 4, pp. 715-725, 2010.
 Felfli, F. F., Soler, P. B., and Rocha, J. D., "MathmaticalModelling of
Wood and Briquettes Torrefaction," Proceedings of the 5th Encontro de
Energia no Meio Rural, Campinas, Spain, October 19-21, 2004.
 Thurner, F. and Mann, U., "Kinetic Investigation of Wood Pyrolysis,"
Industrial & Engineering Chemistry Process Design and Development,
Vol. 20, No. 3, pp. 482-488, 1981.