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Structural and thermal properties of Populus tomentosa during carbon dioxide torrefaction

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  • Li, Shu-Xian
  • Zou, Jin-Ying
  • Li, Ming-Fei
  • Wu, Xiao-Fei
  • Bian, Jing
  • Xue, Zhi-Min

Abstract

Populus tomentosa was torrefied under carbon dioxide in a tubular reactor to investigate the effects of temperature (240–320 °C) and reaction time (30–120 min) on the solid char. The influences of the reaction conditions on mass yield, energy yield and higher heating value (HHV) were investigated by using response surface methodology. The structural and thermal properties of the torrefied poplar were comprehensively characterized with multiple techniques. Results indicated that torrefaction temperature showed a greater influence on mass yield, energy yield and HHV than time. Torrefaction led to substantial changes of the structural properties of poplar, as evidenced by the variation of microstructure, elements, and CrI value. The torrefied sample showed good thermal stability as determined by the thermal analysis. In addition, the combustion reactivity increased from 4.13%/(min °C) in the raw material to 4.98%/(min °C) for the sample subjected to torrefaction at 280 °C for 75 min. The data provides meaningful insight on the upgradation of poplar through torrefaction.

Suggested Citation

  • Li, Shu-Xian & Zou, Jin-Ying & Li, Ming-Fei & Wu, Xiao-Fei & Bian, Jing & Xue, Zhi-Min, 2017. "Structural and thermal properties of Populus tomentosa during carbon dioxide torrefaction," Energy, Elsevier, vol. 124(C), pages 321-329.
    • Handle: RePEc:eee:energy:v:124:y:2017:i:c:p:321-329
    DOI: 10.1016/j.energy.2017.02.079
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    1. Chen, Wei-Hsin & Peng, Jianghong & Bi, Xiaotao T., 2015. "A state-of-the-art review of biomass torrefaction, densification and applications," Renewable and Sustainable Energy Reviews, Elsevier, vol. 44(C), pages 847-866.
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    Cited by:

    1. Jeeban Poudel & Sujeeta Karki & Sea Cheon Oh, 2018. "Valorization of Waste Wood as a Solid Fuel by Torrefaction," Energies, MDPI, vol. 11(7), pages 1-10, June.
    2. Kutlu, O. & Kocar, G., 2020. "Improving stability of torrefied biomass at cooling stage," Renewable Energy, Elsevier, vol. 147(P1), pages 814-823.
    3. Sukiran, Mohamad Azri & Wan Daud, Wan Mohd Ashri & Abnisa, Faisal & Nasrin, Abu Bakar & Abdul Aziz, Astimar & Loh, Soh Kheang, 2021. "A comprehensive study on torrefaction of empty fruit bunches: Characterization of solid, liquid and gas products," Energy, Elsevier, vol. 230(C).

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