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Combustion characteristics of chars from raw and torrefied willow

Fisher E.M., Darvell L.I., Saddawi A., Jones J.M., Dupont C., Commandre J.M., Nocquet T., Salvador S.. 2011. In : Combustion Institute. 7th US National Meeting of the Combustion Institute, Atlanta, Etats-Unis, 20-23 March 2011. s.l. : s.n., 6 p.. US National Meeting of the Combustion Institute. 7, 2011-03-20/2011-03-23, Atlanta (Etats-Unis).

There is much interest in co-firing biomass with coal in power plants. Torrefaction is a mild thermal pretreatment (T < 300°C) that improves the milling and storage properties of biomass, making it more like coal, and thus more compatible with existing power plant equipment. We use non-isothermal thermogravimetric analysis to investigate the differences in oxidative reactivities between chars prepared from torrefied and raw willow. Both high- and low-heating-rate chars are investigated. High-heating-rate chars were prepared in a drop tube furnace at a temperature of 900°C with a residence time of 2 s. Low-heating-rate chars were prepared in a crucible in a tube furnace, with a heating rate of 33°C/min, a maximum temperature of 1000 ?C, and a residence time of 1 hour at the maximum temperature. We find that torrefaction has a minimal impact on char reactivities for the low-heating-rate chars, while for the high-heating-rate case the chars prepared from raw willow are over twice as reactive as those prepared from torrefied willow.

Mots-clés : produit dérivé du bois; traitement thermique; carbonisation du bois; bois; pyrolyse; salix; charbon de bois; torréfaction; bois torréfié

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