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

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

Renewable Energy, 2024, vol. 235, issue C

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.

Keywords: Relative fuel property variation; Gas-pressurized torrefaction; Biochar; Comparative advantage analysis; Fuel performance evaluation; Hardgrove grindability index (search for similar items in EconPapers)
Date: 2024
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:235:y:2024:i:c:s0960148124014344

DOI: 10.1016/j.renene.2024.121366

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