Energy requirement for fine grinding of torrefied wood

By Vincent Repellin, A. Govin, M. Rolland, R. Guyonnet. 2010

287 citations recorded by the source corpus.

Abstract The purpose of this study is to investigate the influence of torrefaction on wood grinding energy. Wood chips were torrefied at different temperatures and durations. The energy required to obtain fine powder was measured. Particle size analyses were carried out on each powder sample. It is showed that torrefaction decreases both grinding energy and particle size distribution. A criterion to compare grindability of natural and torrefied wood is proposed. It takes into account both grinding energy and particle size distribution. It accounts the energy required for grinding particles to sizes inferior to 200 μm, for given grinding conditions. Torrefaction is characterised by the anhydrous weight loss (AWL) of wood. For AWL inferior to around 8%, grinding energy decreases fast. Over 8%, grinding energy decreases at a slow rate. Particle size distribution decreases linearly as the AWL increases. Both for spruce and beech, the grinding criterion is decreased of 93% when the AWL is around 28%.

Subfields: Biomedical Engineering, Polymers and Plastics

View Paper: https://www.semanticscholar.org/paper/d6e8a488d3228d95f0277d2670519c20de691f90

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In Biomedical Engineering

1. Animesh Dutta
2. Carly Whittaker
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Citations in the corpus

• Thermal pretreatment of wood (Lauan) block by torrefaction and its influence on the properties of the biomass (2011, unknown): “The advantages accompanied by torrefaction include (1) the higher heating value or energy density [16e18], (2) the lower O/C ratio and moisture content [19e22] and (3) the easier storage, grindability, reactivity and delivery [23,24] of biomass.”
• Changes of chemical and mechanical behavior of torrefied wheat straw (2012, background): “Further 44 studies about the torrefaction and grindability of wood samples have been made by [7-10].”
• Biochar: a synthesis of its agronomic impact beyond carbon sequestration. (2012, background): “…densifi cation, reducing transportation costs due to moisture removal and increasing heating values (Bourgois and Guyonnet, 1988), which generates an energy product amenable to coal-blending and subsequent co-combustion (Bridgeman et al., 2010; Repellin et al., 2010; Phanphanich and Mani, 2011).”
• A review of wood thermal pretreatments to improve wood composite properties (2013, unknown): “The mechanism of biomass torrefaction has been widely studied and reported elsewhere (Fonseca et al. 2005; Bellais et al. 2003; Turner et al. 2010; Repellin et al. 2010a; Ciolkosz and Wallace 2011).”
• A review on advances of torrefaction technologies for biomass processing (2012, background): “Generally, density varies in a different way depending on wood species during temperature treatment [20, 22], and the changes with respect to torrefaction might not be very significant [23].”