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In this study, the thermal degradation behavior of biomass during torrefaction was studied by thermogravimetric and byproduct gas analysis. Torrefaction temperature, time, and heating rate were 220∼300℃, 110 min, and 10∼30℃ /min, respectively. The degradation rate of yellow poplar was 8.01∼8.81% at 220℃ and 71.86∼77.38% at 300℃ depending on heating rate. The degradation rate significantly increased at temperature over 240℃. On the other hand, degradation rate of larch was relatively low as 49.58∼54.15% at 300℃. The activation energy of yellow poplar was 87.32∼91.24 kJ/mol; these values did not significantly change with heating rate. The activation energy of larch was 83.85∼91.60 kJ/mol. The major components of the gas generated during torrefaction were derived from hemicellulose.

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Hyoung-Woo Lee 2, † ⋅Jae-Won Lee 2 ⋅Sung-Ho Gong 3 ⋅Yeon-Sang Song 4 ABSTRACT1 )Size reduction is an important pre-processing operation for utilizing biomass as a sustainable resource in industrial-scale energy production and as a raw material for other industries. This work investigates the size reduction characteristics of air-dried Miscanthus sacchariflorus Goedae-Uksae 1 (Amur silver grass) via image processing and identifies the morphological characteristics of comminuted and screened M. sacchariflorus. At chopping lengths of 18, 40, 80, and 160 mm, 81%, 77%, 78%, and 76% of the particles, respectively, passed through a 4-mm sieve. Even a knife mill with a very small screen aperture (>1 mm) admitted over 10% of the particles. The average circularity and aspect ratio of the particles were <0.30 and >10, respectively. These results confirm that in all preparation modes, most M. sacchariflorus particles were needle-like in shape, irrespective of the type of preparation.

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