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

Luis E. Arteaga-Pérez, Cristina Segura, Daniela Espinoza, Ljubisa R. Radovic, Romel Jiménez

Research output: Contribution to journalArticle

27 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)13-23
Number of pages11
JournalEnergy for Sustainable Development
Volume29
DOIs
StatePublished - Dec 1 2015

All Science Journal Classification (ASJC) codes

  • Geography, Planning and Development
  • Renewable Energy, Sustainability and the Environment
  • Management, Monitoring, Policy and Law

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