Biomass torrefaction characteristics in inert and oxidative atmospheres at various superficial velocities

Wei Hsin Chen, Ke Miao Lu, Shih Hsien Liu, Chi Ming Tsai, Wen Jhy Lee, Ta Chang Lin

Research output: Contribution to journalArticle

58 Citations (Scopus)

Abstract

The reaction characteristics of four biomass materials (i.e. oil palm fiber, coconut fiber, eucalyptus, and Cryptomeria japonica) with non-oxidative and oxidative torrefaction at various superficial velocities are investigated where nitrogen and air are used as carrier gases. Three torrefaction temperatures of 250, 300, and 350°C are considered. At a given temperature, the solid yield of biomass is not affected by N2 superficial velocity, revealing that the thermal degradation is controlled by heat and mass transfer in biomass. Increasing air superficial velocity decreases the solid yield, especially in oil palm fiber and coconut fiber, implying that the torrefaction reaction of biomass is dominated by surface oxidation. There exists an upper limit of air superficial velocity in the decrement of solid yield, suggesting that beyond this limit the thermal degradation of biomass is no longer governed by surface oxidation, but rather is controlled by internal mass transport.

Original languageEnglish
Pages (from-to)152-160
Number of pages9
JournalBioresource technology
Volume146
DOIs
Publication statusPublished - 2013 Oct

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Environmental Engineering
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal

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