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Torrefaction of sawdust in a fluidized bed reactor |
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| Authors: | Li Hui Liu Xinhua Legros Robert Bi Xiaotao T Lim C J Sokhansanj Shahab |
| Institution: | a Clean Energy Research Centre & Department of Chemical & Biological Engineering, University of British Columbia, Vancouver, Canada b Key Laboratory of Environmental Biology and Pollution Control, College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China c Institute of Process Engineering, Chinese Academy of Sciences, Beijing, PR China d Chemical Engineering Department, Ecole Polytechnique de Montreal, Montreal, Canada e Environmental Science Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831-6422, USA |
| Abstract: | In the present work, stable fluidization of sawdust was achieved in a bench fluidized bed with an inclined orifice distributor without inert bed materials. A solids circulation pattern was established in the bed without the presence of slugging and channeling. The effects of treatment severity and weight loss on the solid product properties were identified. The decomposition of hemicelluloses was found to be responsible for the significant changes of chemical, physical and mechanical properties of the torrefied sawdust, including energy content, particle size distribution and moisture absorption capacity. The hydrophobicity of the torrefied sawdust was improved over the raw sawdust with a reduction of around 40 wt.% in saturated water uptake rate, and enhanced with increasing the treatment severity due to the decomposition of hemicelluloses which are rich in hydroxyl groups. The results in this study provided the basis for torrefaction in fluidized bed reactors. |
| Keywords: | Biomass torrefaction Sawdust Fluidized bed Hydrophobicity Heating value |
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