Heat and mass transfer modeling during wood carbonization (original) (raw)

Abstract

A theoretical study of the carbonization of thick wood particles has been developed. The proposed model takes into account heat and mass transfer and chemical kinetics simultaneously. The thermal properties of wood are considered to be linear functions of the temperature and have been estimated from literature data or by fitting the model with experimental data. Carbonization process have been simulated by a scheme consisting of three parallel reactions of the virgin wood decomposition and secondary reaction of the primary tar. The kinetic parameters have been determined experimentally by thermogravimetric analysis. The mathematical formulation leads to a system of coupled nonlinear partial differential equations, which have been solved iteratively by an implicit finite differences method. The residual mass as well as the temperature profile inside the thick particle are simulated. The obtained results are in good agreement with the available experimental data.

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