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Effect of severe torrefaction by superheated steam on pinewood pyrolysis kinetics and pyrolytic oil compounds

Author

Listed:
  • Chen, Xuejiao
  • Wang, Hong
  • Yang, Rui
  • Lin, Wei
  • Qi, Zhiyong
  • Zhang, Dongdong

Abstract

Hemicellulose, cellulose, lignin and extractives generally contribute a variety of compounds to pyrolytic oil during pyrolysis. Severe torrefaction process to remove those compounds may influence the diversity and quality of pyrolytic oil. In this study, pinewood, as a frequently studied biomass for pyrolysis research, was firstly torrefied by superheated steam (SHS) in different intensities prior to both slow pyrolysis and Py-GCMS. The kinetic study demonstrated that the activation energy of pyrolysis for the biomass increased greatly from 172.66 kJ mol−1 to a maximum of 400.18 kJ mol−1 after SHS torrefaction. The pyrolytic oil from both slow pyrolysis and Py-GCMS were analyzed. The content of hemicellulose and cellulose biomass reduced with increasing SHS torrefaction intensities. As a result, the light oxygenates, sugars and furans in pyrolytic oil decreased greatly, whereas the concentration of phenol and aromatics improved. In addition, the phenolic compounds shifted to smaller molecular weight and the acetic acid as an adverse factor in pyrolytic oil decreased and even disappeared under severe torrefaction. SHS torrefaction provide a new insight for biomass pretreatment for further pyrolysis.

Suggested Citation

  • Chen, Xuejiao & Wang, Hong & Yang, Rui & Lin, Wei & Qi, Zhiyong & Zhang, Dongdong, 2024. "Effect of severe torrefaction by superheated steam on pinewood pyrolysis kinetics and pyrolytic oil compounds," Renewable Energy, Elsevier, vol. 227(C).
    • Handle: RePEc:eee:renene:v:227:y:2024:i:c:s0960148124006311
    DOI: 10.1016/j.renene.2024.120563
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