Combustion and gasification characteristics of chars from raw and torrefied biomass

Fisher, E. M., Dupont, C., Darvell, L. I. , Commandre, J. M., Saddawi, A., Jones, J. M., Grateau, M., Nocquet, T. and Salvador, S. (2012) Combustion and gasification characteristics of chars from raw and torrefied biomass. Bioresource Technology, 119 . pp. 157-165. ISSN 0960-8524

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Torrefaction is a mild thermal pretreatment (T<300C) that improves biomass milling and storage properties. The impact of torrefaction on the gasification and oxidation reactivity of chars from torrefied and raw biomass was investigated. Thermogravimetric analysis was used to study the differences in O(2) and steam reactivity, between chars prepared from torrefied and raw willow, under both high- and low-heating-rate conditions. High-heating-rate chars were prepared at 900C with a residence time of 2s. Low-heating-rate chars were prepared with a heating rate of 33C/min, a maximum temperature of 850 or 1000C, and a residence time of 30min or 1h, respectively, at the maximum temperature. Pretreatment by torrefaction consistently reduced char reactivity. Torrefaction's impact was greatest for high-heating-rate chars, reducing reactivity by a factor of two to three. The effect of torrefaction on a residence time requirements for char burnout and gasification was estimated.

Keywords:combustion, gasification, torrefaction, biomass, char
Subjects:H Engineering > H221 Energy Resources
H Engineering > H800 Chemical, Process and Energy Engineering
Divisions:College of Science > School of Engineering
ID Code:10706
Deposited On:11 Jul 2013 14:47

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