Journal
BIORESOURCE TECHNOLOGY
Volume 100, Issue 12, Pages 3134-3139Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2009.01.007
Keywords
Pyrolysis; Biomass; Kinetic model; Heat transfer model; Finite Volume Method
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A fully transient mathematical model has been developed to describe the pyrolysis of large biomass particles. The kinetic model consists of both primary and secondary reactions. The heat transfer model includes conductive and internal convection within the particle and convective and radiative heat transfer between the external surface and the bulk. An implicit Finite Volume Method (FVM) with Tridiagonal Matrix Algorithm (TDMA) is employed to solve the energy conservation equation. Experimental investigations are carried out for wood fines and large wood cylinder and sphere in an electrically heated furnace under inert atmosphere. The model predictions for temperature and mass loss histories are in excellent agreement with experimental results. The effect of internal convection and particle shrinkage on pyrolysis behaviour is investigated and found to be significant. Finally, simulation studies are carried out to analyze the effect of bulk temperature and particle size on total pyrolysis time and the final yield of char. (C) 2009 Elsevier Ltd. All rights reserved.
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