Pyrolysis of Untreated and Various Torrefied Stem Wood, Stump, and Bark of Norway Spruce

Eszter Barta-Rajnai, Zoltán Sebestyén, Emma Jakab, Eszter Patus, János Bozi, Liang Wang, Øyvind Skreiberg, Morten Grønli, Roger Khalil, Zsuzsanna Czégény

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Abstract

The effect of torrefaction severity (temperature and residence time) was studied on the thermal decomposition of different parts of Norway spruce (stem wood, stump, and bark). The volatile content of the torrefied samples was characterized by pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS). The tendencies of the intensities of the most characteristic pyrolysis products of the untreated and torrefied samples have been compared. The Py-GC/MS results are interpreted in terms of the chemical composition changes (cellulose and hemicellulose). It was found that the alkali ions do not catalyze the thermal decomposition of hemicellulose contrary to cellulose. The results of the Py-GC/MS analysis demonstrated that the yields of acetic acid and other compounds of low molecular mass were reduced in the pyrolyzates of each torrefied sample, including the treatment at 225 °C. Principal component analysis has been used to reveal correlations between the torrefaction temperature, residence time, and product distribution of the samples. The torrefied stem wood and stump behaved similarly during torrefaction; therefore, they can be used together in thermochemical conversion applications. However, the torrefaction of bark requires about a 25 °C lower torrefaction temperature than stem wood and stump.

Original languageEnglish
Pages (from-to)3210-3220
Number of pages11
JournalEnergy and Fuels
Volume33
Issue number4
DOIs
Publication statusPublished - Apr 18 2019

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology

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    Barta-Rajnai, E., Sebestyén, Z., Jakab, E., Patus, E., Bozi, J., Wang, L., Skreiberg, Ø., Grønli, M., Khalil, R., & Czégény, Z. (2019). Pyrolysis of Untreated and Various Torrefied Stem Wood, Stump, and Bark of Norway Spruce. Energy and Fuels, 33(4), 3210-3220. https://doi.org/10.1021/acs.energyfuels.8b04130