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Forests 2018, 9(9), 535; https://doi.org/10.3390/f9090535

Potential of Mild Torrefaction for Upgrading the Wood Energy Value of Different Eucalyptus Species

1
Centro de Estudos Florestais, Instituto Superior de Agronomia, Universidade de Lisboa, Tapada da Ajuda, 1349-017, Lisboa, Portugal
2
Universidade Federal de Viçosa, Avenida Peter Henry Rolfs s/n, Viçosa 36571-000, Minas Gerais, Brazil
3
Instituto Politécnico de Viseu- Escola Superior de Tecnologia e Gestão de Viseu, Av. Cidade Politécnica, Viseu 3504-510, Portugal
*
Author to whom correspondence should be addressed.
Received: 8 August 2018 / Revised: 28 August 2018 / Accepted: 30 August 2018 / Published: 1 September 2018
(This article belongs to the Section Forest Ecology and Management)
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Abstract

Torrefaction is a promising pre-treatment for improving the fuel quality of biomass. This study examined the effect of a mild torrefaction (from 160 to 230 °C) on the heating value, elemental composition, and thermogravimetric analysis of wood from eight Eucalyptus species (E. botryoides Sm., E. globulus Labill., E. grandis W.Hill ex Maiden, E. maculata (Hook.) K.D. Hill & L.A.S.Johnson, E. propinqua Maiden Deane, E. rudis Endl., E. saligna Sm., and E. viminalis Labill.). The higher heating values (HHV) increased from the initial average of 19 MJ kg−1 to 21 MJ kg−1 in the torrefied samples. The carbon content increased from 48.2% to 53.3% and the C/O ratio from 1.08 to 1.35. The torrefied wood samples showed more thermal stability with a shift of the mass loss peaks to higher temperatures and a higher residual mass at 450 °C of 36%, in comparison to 30% of the untreated samples. Torrefaction concentrated the biomass samples in the more energetic and thermal resistant components and decreased their sulfur and chlorine content, leading to a better combustion performance. The wood of the eight Eucalyptus species had a similar behavior and showed quality improvement. Therefore, torrefaction showed potential as a pre-treatment for eucalyptus biomass fuel improvement. View Full-Text
Keywords: Eucalyptus; torrefaction; high heating value (HHV); thermogravimetric analysis (TGA); elemental composition Eucalyptus; torrefaction; high heating value (HHV); thermogravimetric analysis (TGA); elemental composition
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Araújo, S.O.; Neiva, D.M.; Carneiro, A.C.; Esteves, B.; Pereira, H. Potential of Mild Torrefaction for Upgrading the Wood Energy Value of Different Eucalyptus Species. Forests 2018, 9, 535.

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