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Relative fuel property variation of gas-pressurized and conventional torrefaction for biochar performance assessment

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  • Zhang, Congyu
  • Zhan, Yong
  • Chen, Wei-Hsin
  • Lamba, Bhawna Yadav
  • Zhang, Ying

Abstract

Exploring biochar from gas-pressurized torrefaction for solid biofuel production is of great concern for the process performance assessment. This study conducts several relative indexes of biochars produced from gas-pressurized and conventional torrefaction, identifying the merits of the former. The results suggest that a higher pressure is more feasible for reducing biochar volume and enhancing energy efficiency. The results of the relative higher heating value (1.01–1.07) and relative enhancement factor (1.00–1.06) indicate that gas-pressurized torrefaction is more efficient for energy density improvement. Furthermore, gas-pressurized torrefaction dramatically facilitates biochar grindability, with the relative Hardgrove grindability index value ranging from 1.20 to 2.40. The proximate and elemental analysis results suggest that a higher pressure facilitates biochar carbonization and deoxygenation with a higher carbonized component. The energy consumption, efficiency, and expense calculation results imply that gas-pressurized torrefaction is more energy-efficient and cost-saving, with the relative upgrading energy index range of 1.00–1.12.

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  • Zhang, Congyu & Zhan, Yong & Chen, Wei-Hsin & Lamba, Bhawna Yadav & Zhang, Ying, 2024. "Relative fuel property variation of gas-pressurized and conventional torrefaction for biochar performance assessment," Renewable Energy, Elsevier, vol. 235(C).
    • Handle: RePEc:eee:renene:v:235:y:2024:i:c:s0960148124014344
    DOI: 10.1016/j.renene.2024.121366
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    References listed on IDEAS

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