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

  • Edgar A. SilveiraEmail author
  • Luiz Gustavo Oliveira Galvão
  • Isabella A. Sá
  • Bruno F. Silva
  • Lucélia Macedo
  • Patrick Rousset
  • Armando Caldeira-Pires


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.


Torrefaction Eucalyptus grandis Oxidizing atmosphere TG Solid yield Energy yield 



The research presented was supported by Brazilian National Council for Scientific and Technological Development (CNPq), Brazilian Foundation for the Coordination and Improvement of Higher Level or Education Personnel (Capes) and Brazilian Forest Products Laboratory.


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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2019

Authors and Affiliations

  1. 1.Mechanical Engineering DepartmentUniversity of BrasíliaBrasíliaBrazil
  2. 2.Forest Products Laboratory (LPF)Brazilian Forest Service (SFB)BrasíliaBrazil
  3. 3.BiowooebUniv Montpellier, CiradMontpellierFrance
  4. 4.Joint Graduate School of Energy and Environment - Center of Excellence on Energy Technology and EnvironmentKMUTTBangkokThailand

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