Drying characteristics and equilibrium moisture content of steam-treated Douglas fir (Pseudotsuga menziesii L.)

Larsson, SylviaSwedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Skogens biomaterial och teknologi,Department of Forest Biomaterials and Technology (författare)

Douglas fir (Pseudotsuga menziesii L) particles were exposed to high pressure saturated steam (200 and 220 degrees C for Sand 10 min) to improve the durability and hydrophobicity of pellets produced from them. Depending on treatment severity, the moisture content of the particles increased from 10% to 36% (wet basis). Douglas fir particles steam-treated at 220 degrees C for 10 min had the fastest drying rate of 0.014 min(-1). The equilibrium moisture content (EMC) of steam-treated samples decreased with increasing steam temperature and treatment time. The Giggnheim-Anderson-deBoer (GAB) equilibrium model gave a good fit with the equilibrium data with R-2 = 0.99. The adsorption rate of untreated pellets exposed to humid air (30 degrees C, 90% RH) for 72 h was 0.0152 min(-1) while that of steam-treated pellets ranged from 0.0125 to 0.0135 min(-1) without a clear trend with steam treatment severity. These findings are critical to develop durable and less hygroscopic pellets. (C) 2012 Elsevier Ltd. All rights reserved.

Sveriges lantbruksuniversitetSkogens biomaterial och teknologi (creator_code:org_t)
Sveriges lantbruksuniversitet

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