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Effect of torrefaction on thermal behavior and fuel properties of Eucalyptus grandis macro-particulates

Silveira A. E., Oliveira Galvão L.G., Sá I.A., Silva B.F., Macedo L., Rousset P., Caldeira-Pires A.. 2018. Journal of Thermal Analysis and Calorimetry : 8 p..

Considered as a carbon-neutral fuel from a climate change perspective and the most common renewable resource, biomass needs an energetic conversion process to replace more conventional energy sources. Torrefaction is a thermal modification process used to improve biomass as solid fuel. In this study, macro-particles of Eucalyptus grandis were investigated under an oxidizing atmosphere (10% O2). The aim was to evaluate the effect of the temperature (230, 250, 270 and 290 °C) and heating rates (3, 5 and 7 °C min?1) on 3?×?3?×?3 cm samples by the assessment of the dynamic solid yield and its derivative curve, proximate analysis as well as energy content. The solid yield decreases with increasing temperature showing a linear relationship (R2?=?0.97) for light and mild torrefaction and more aggressive behavior for severe torrefaction (280 and 290 °C) with degradation varying from 6.7 to 34.8% and a higher heating value enhancement varying from 3.4% (230 °C) to 24.3% (290 °C). The approach followed allows a characterization of biomass samples, thermal behaviors dynamics as well as the torrefied final product showing the impact of temperature, heating rate and residence time.

Mots-clés : eucalyptus grandis; température; torréfaction; bois; Énergie renouvelable

Thématique : Sources d'énergie renouvelable; Technologie des produits forestiers

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