Developing an Empirical Formula for the Assessment of the Char Yield of Pyrolyzed Lignocellulosic Materials

A new empirical formula, based on the porosity, the botanical composition and the ash content of the precursor, is proposed for the assessment of the char yield, Y (wt%), of lignocellulosic materials pyrolyzed in a 600°C-900°C temperature range. The following equation is proposed:     Y (wt%) = (0.8...

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Bibliographic Details
Published in:Energy sources. Part A, Recovery, utilization, and environmental effects Recovery, utilization, and environmental effects, 2007-09, Vol.29 (12), p.1121-1127
Main Authors: Jeanne-Rose, V., Passé-Coutrin, N., Ouensanga, A.
Format: Article
Language:English
Subjects:
carbonization
char yield
lignocellulosic material
porosity
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Summary:A new empirical formula, based on the porosity, the botanical composition and the ash content of the precursor, is proposed for the assessment of the char yield, Y (wt%), of lignocellulosic materials pyrolyzed in a 600°C-900°C temperature range. The following equation is proposed:     Y (wt%) = (0.8815 − 2.281/ϵ + 61.44/ϵ 2 )          · {[L(0.59 − 2.74 × 10 −4 (t°C − 600) + 0.22C]         + A − 0.1 E [1 + 2 × 10 −3 (600 − t°C)]} where ϵ, L, C, A, and E are parameters of the precursor, namely: porosity (%) and percentage (wt%) of lignin, cellulose, ash, and extractives, the t temperature, being in the Celsius grade. The values calculated by the formula fit satisfactorily with the experimental results, the gap being less than 0.5%.
ISSN:1556-7036
1556-7230
DOI:10.1080/00908310500434382