Torrefaction of Pinus radiata and Eucalyptus globulus: A combined experimental and modeling approach to process synthesis

  • Arteaga-Pérez L
  • Segura C
  • Espinoza D
 et al. 
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Abstract

© 2015 International Energy Initiative. The use of wood as feedstock for the production of energy and chemicals is a strategy used by both developing and developed countries because it increases the sustainability of their energy infrastructure. Torrefaction of forest resources for co-firing and densification of biomass energy is among the most prominent alternatives. This study is focused on technical aspects of torrefaction technology by analyzing both energy and exergy changes through a comprehensive physico-chemical model (Aspen One v8.6 software) of a plant operating in mild (250. °C) and severe (280. °C) regimes. The main wood species in Chilean plantations, Eucalyptus globulus and Pinus radiata, were processed in a lab-scale apparatus to obtain the data for model calibration. We found that xylan composition in hemicelluloses has a considerable effect on global thermal efficiency, volatiles energy content, energy density, and exergy yield of torrefied product. The highest efficiency (96%) is obtained for Eucalyptus at 250. °C when moisture in the feedstock is ≤. 20%. Combustion of volatile products (torgas) for drying does not result in substantial technical benefits for the overall process; however, their post-combustion does lead to lower exergy losses.

Author-supplied keywords

  • Aspen One v8.6
  • Modeling
  • Simulation
  • Torrefaction

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Authors

  • L.E. Arteaga-Pérez

  • C. Segura

  • D. Espinoza

  • L.R. Radovic

  • R. Jiménez

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