Impact of Torrefaction on Woody Biomass Properties

Liang Wang, Eszter Barta-Rajnai, Oyvind Skreiberg, Roger Khalil, Z. Czégény, E. Jakab, Zsolt Barta, Morten Grønli

Research output: Contribution to journalConference article

21 Citations (Scopus)


In this work, Norway spruce stem wood, stump and bark were torrefied in a tubular reactor. The effects of feedstock type and torrefaction process parameters such as torrefaction temperature and residence time on the grindability and chemical properties of the torrefied biomass samples were investigated. In comparison to torrefaction temperature, torrefaction residence time had smaller effects on the grindability of stem wood and stump. For raw bark, much less grinding energy is required compared to those for raw stem wood and stump. Torrefaction has minor effects on grindability of the bark. The cellulose contents of stem wood and stump were reduced slightly at a torrefaction temperature of 275°C. On the contrary, the cellulose content of the torrefied bark drastically decreased already at a torrefaction temperature of 275°C, with only trace amounts left in the 300°C torrefied products.

Original languageEnglish
Pages (from-to)1149-1154
Number of pages6
JournalEnergy Procedia
Publication statusPublished - Jan 1 2017
Event8th International Conference on Applied Energy, ICAE 2016 - Beijing, China
Duration: Oct 8 2016Oct 11 2016



  • bark
  • chemical composition
  • grindability
  • stem wood
  • stump
  • torrefaction

ASJC Scopus subject areas

  • Energy(all)

Cite this

Wang, L., Barta-Rajnai, E., Skreiberg, O., Khalil, R., Czégény, Z., Jakab, E., Barta, Z., & Grønli, M. (2017). Impact of Torrefaction on Woody Biomass Properties. Energy Procedia, 105, 1149-1154.