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Predicting the energy properties of torrefied debarked pine pellets from torrefaction temperature and residence time

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  • Iglesias Canabal, Andrés
  • Proupín Castiñeiras, Jorge
  • Rodríguez Añón, José Antonio
  • Eimil Fraga, Cristina
  • Rodríguez Soalleiro, Roque

Abstract

In this study, high quality radiata pine pellets were torrefied at a range of temperatures (T = 210, 240, 270 and 300 °C) and residence times (t = 20, 40 and 60 min). The effects of these treatments on mass yield (MY), ash content (A), volatile matter (VM) and fixed carbon (FC), high heating value on a dry basis (HHVdb) and low heating value on a wet basis (LHVwb) were investigated, and models were constructed to predict these energy properties from T and t. Untreated pellets were analysed as control samples. Threshold conditions of 240 °C 40 min yielded significant increases in HHVdb and carbon content and a significant decrease in oxygen content. This combination significantly increased A and FC and significantly decreased VM. Logistics models using T, t, t × T and T2 were able to predict A accurately, with no bias, whereas FC values tended to be underestimated. The variation in HHVdb and LHVwb was explained by linear models with t and t × T as variables. Use of the models enabled definition of torrefaction severity that ensures an A below 0.7% and a LHVwb value 30% higher than obtained with raw pine pellets. Torrefaction conditions of T = 260–270 °C and t = 50–60 min are proposed.

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  • Iglesias Canabal, Andrés & Proupín Castiñeiras, Jorge & Rodríguez Añón, José Antonio & Eimil Fraga, Cristina & Rodríguez Soalleiro, Roque, 2023. "Predicting the energy properties of torrefied debarked pine pellets from torrefaction temperature and residence time," Renewable Energy, Elsevier, vol. 218(C).
    • Handle: RePEc:eee:renene:v:218:y:2023:i:c:s0960148123012612
    DOI: 10.1016/j.renene.2023.119346
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    References listed on IDEAS

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    1. Chen, Wei-Hsin & Peng, Jianghong & Bi, Xiaotao T., 2015. "A state-of-the-art review of biomass torrefaction, densification and applications," Renewable and Sustainable Energy Reviews, Elsevier, vol. 44(C), pages 847-866.
    2. Jorge Miguel Carneiro Ribeiro & Radu Godina & João Carlos de Oliveira Matias & Leonel Jorge Ribeiro Nunes, 2018. "Future Perspectives of Biomass Torrefaction: Review of the Current State-Of-The-Art and Research Development," Sustainability, MDPI, vol. 10(7), pages 1-17, July.
    3. Ghiasi, Bahman & Kumar, Linoj & Furubayashi, Takaaki & Lim, C. Jim & Bi, Xiaotao & Kim, Chang Soo & Sokhansanj, Shahab, 2014. "Densified biocoal from woodchips: Is it better to do torrefaction before or after densification?," Applied Energy, Elsevier, vol. 134(C), pages 133-142.
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    1. Kostyniuk, Andrii & Likozar, Blaž, 2024. "Wet torrefaction of biomass waste into value-added liquid product (5-HMF) and high quality solid fuel (hydrochar) in a nitrogen atmosphere," Renewable Energy, Elsevier, vol. 226(C).
    2. Kostyniuk, Andrii & Likozar, Blaž, 2024. "Wet torrefaction of biomass waste into high quality hydrochar and value-added liquid products using different zeolite catalysts," Renewable Energy, Elsevier, vol. 227(C).

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