Experimental Study on Fast Pyrolysis of Raw and Torrefied Woody Biomass

Alexander C. Louwes, Ruben B. Halfwerk, Eddy A. Bramer*, Gerrit Brem

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

5 Citations (Scopus)
52 Downloads (Pure)


Herein, the conversion times of biomass pyrolysis are measured at temperatures between 450 and 550 °C and particle size fractions between 0 and 400 μm using a cyclonic thermogravimetric analyzer (TGA) device. Beech, spruce, and ash wood are investigated, as well as torrefied samples. The conversion time decreases with the increasing temperature from 7 to less than 1 s. The influence of the type of biomass on the conversion time is limited and only significant for low temperatures, when kinetics dominates the conversion process. A clear influence of the torrefaction process on the pyrolysis conversion time is noted and can be explained by the modified porosity of the biomass particles during the torrefaction process. Kinetic data are extracted from the conversion times, and a model is developed for a better interpretation of the measured results. The model shows good comparison with the experimental data and may also be used for design purposes of fast pyrolysis reactors.

Original languageEnglish
Article number1900799
JournalEnergy technology
Issue number7
Early online date24 Dec 2019
Publication statusPublished - 1 Jul 2020


  • UT-Hybrid-D
  • heat transfers
  • kinetics
  • pyrolysis
  • torrefaction
  • biomass conversions


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