Journal
BIORESOURCE TECHNOLOGY
Volume 102, Issue 2, Pages 1246-1253Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2010.08.028
Keywords
Torrefaction; Wood chips; Logging residues; Grinding energy consumption; Coal
Funding
- State of Georgia (GA), USA
- Office of Vice President for Research (OVPR), University of Georgia, Athens (UGA)
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Thermal pretreatment or torrefaction of biomass under anoxic condition can produce an energy dense and consistent quality solid biomass fuel for combustion and co-firing applications. This paper investigates the fuel characteristics and grindability of pine chips and logging residues torrefied at temperatures ranging from 225 degrees C to 300 degrees C and 30 min residence time. Grinding performance of torrefied biomass evaluated by determining energy required for grinding, particle size distribution and average particle size were compared with raw biomass and coal. Specific energy required for grinding of torrefied biomass decreased significantly with increase in torrefaction temperatures. The grinding energy of torrefied biomass was reduced to as low as 24 kW h/t at 300 degrees C torrefaction temperature. The gross calorific value of torrefied chips increased with increase in torrefaction temperature. Torrefaction of biomass clearly showed the improved fuel characteristics and grinding properties closer to coal. (C) 2010 Elsevier Ltd. All rights reserved.
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