Effect of torrefaction severity on the energy recovery from amazonian wood residues for decentralized energy conversion systems

Silveira Edgar A., Cruz Lamas Giulia, de Oliveira Rodrigues Pedro Paulo, Souto Normando P.B., Chaves Bruno Santana, Oliveira Galvão Luiz Gustavo, Macedo Lucélia, Rodrigues Juliana Sabino, Luz Sandra, Rousset Patrick, Protásio Thiago de Paula. 2025. Effect of torrefaction severity on the energy recovery from amazonian wood residues for decentralized energy conversion systems. Biomass and Bioenergy, 193:107515, 21 p.

Résumé : Brazil features over 196 isolated energy systems, mainly in the Amazonia, relying on diesel-fired conversion for about 96 % of their energy supply. Given diesel's cost and pollution, there's a significant potential for waste wood from sustainable forest management. This study originally assessed torrefaction (225–275 °C, 60 min) to enhance the energy density of a blend (AB) consisting of six (16.66 %) waste wood: Peltogyne lecointei, Erisma uncinatum, Martiodendron elatum, Handroanthus incanus, Dipteryx odorata, and Allantoma decandra. Torrefaction was evaluated through severity indexes, morphological modification, analytical (proximate, ultimate, and calorific) characterizations and kinetic modeling. TGA assessed the torrefied blend's combustion behavior, and related emissions were determined numerically. Torrefaction modifies the raw material by significantly reducing H/C (from 1.87 to 1.05) and O/C (from 0.70 to 0.47) ratios. Considering AB275, fixed carbon sees a 159 % increase, and volatile matter (VM) decreases by 68.3 %. The low ash (0.63 %) in the final product indicates the potential for direct burning and blending for low-ash biofuel. The higher heating value improved from 20.22 to 21.64 MJ kg−1 (1.07 energy densification). Morphological analysis indicated increasing particulate matter and enhanced porosity. The two-step kinetic modeling precisely predicted the solid yield, with R2 values of 0.9979, 0.9951, and 0.9996 for AB225, AB250, and AB275. Torrefaction improved thermal stability, impacting ignition dynamics due to lower O/C and VM. Emission factors from the combustion of torrefied products reported lower emissions than diesel, coal and other biomasses: CO2, NOx, and SO2 at 1281.67–1487.48, 1.12–1.72, and 0.16–0.25 kg ton−1, respectively.

Mots-clés Agrovoc : torréfaction, déchet de bois, biomasse, bois, bois énergie, réduction des émissions, aménagement forestier, charbon, bioénergie, cycle du carbone, biocarburant, produit forestier non ligneux, impact sur l'environnement

Mots-clés géographiques Agrovoc : Amazonie, Brésil

Mots-clés libres : Amazon wood residues, Thermochemical process, Kinetic modeling, Combustion behavior, Emissions assessment

Agences de financement hors UE : Conselho Nacional de Desenvolvimento Científico e Tecnológico, Coordenação de Aperfeiçoamento de Pessoal de Nível Superior

Auteurs et affiliations

• Silveira Edgar A., UNB [Universidade de Brasilia] (BRA) - auteur correspondant
• Cruz Lamas Giulia, UNB [Universidade de Brasilia] (BRA)
• de Oliveira Rodrigues Pedro Paulo, UNB [Universidade de Brasilia] (BRA)
• Souto Normando P.B., Center for the Amazon Protection System (BRA)
• Chaves Bruno Santana, SFB (BRA)
• Oliveira Galvão Luiz Gustavo, BSF (BRA)
• Macedo Lucélia, SFB (BRA)
• Rodrigues Juliana Sabino, SFB (BRA)
• Luz Sandra, UNB [Universidade de Brasilia] (BRA)
• Rousset Patrick, CIRAD-PERSYST-UPR BioWooEB (REU) ORCID: 0000-0002-6956-7465
• Protásio Thiago de Paula, UFLA (BRA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/611263/)

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