Combustion Evaluation of Torrefied Wood Pellets on a 50 KWth Boiler

J.-B. Michel, C. Mahmed, J. Ropp, J. Richard, M.A. Sattler & M. Schmid
Torrefied wood pellets are produced from torrefied chips by thermo-chemical pre-treatment of biomass at 200-320°C in the absence of oxygen during about 15-30 minutes. Overall, the torrefaction process efficiency has been reported to be 90-95% % as compared to 84% for pelletisation. Torrefaction improves the biomass: 30% higher calorific value and 50% higher energy density resulting in much lower handling and transport costs. The fuel becomes hydrophobic making long term outdoor storage possible. The purpose...