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Communication Dans Un Congrès Année : 2012

Fluidization and rheological approaches for characterization of wood biomass flowability

Résumé

The thermochemical processes for biomass conversion such as downward-moving bed reactor, dense fluidized bed reactor and entrained flow gasifier need a good knowledge of biomass flowability. By its study, transfers (mass, momentum, heat) and reactions (drying, torrefaction, gasification) could be optimized into reactors. Moreover, its control depicts a technology challenge for efficient handling, transportation and injection in order to prevent the process from caking, bridging or other dysfunctions. Torrefaction is a thermal pretreatment of lignocellulosic biomass before gasification. This mild form of pyrolysis, carried out at temperatures between 200 and 300 °C, changes the physical and chemical properties of the material. In particular, it improves the feedstocks homogenisation, enhances the aeration ability and makes the grinding easier (Repellin et al.). Researchers usually devote some techniques to evidencing a posteriori the effects of parameters such as particle size distribution, moisture content of the biomass, humidity of the surrounding atmosphere and temperature (Ganesan et al.). However, a priori explanation of what makes biomass powders flowable requires a complete experimental procedure that combines the simultaneous characterization of the powders and their particles. IFP Energies nouvelles and Ecole des Mines de Saint Etienne have co-developped experimental procedures and related tools for the characterization of wood biomass flowability. The effects of the combined torrefaction and grinding processes are studied on (i) the major particle behavior: grindability, surface state, particle size, shape distribution (ii) and the major powder behavior: bulk density, compressibility, aerability. In this article, the only studied parameter we chose to present is the torrefaction temperature.
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Dates et versions

hal-00667275 , version 1 (07-02-2012)

Identifiants

  • HAL Id : hal-00667275 , version 1

Citer

Mélanie Almendros, Henri Besset, Olivier Bonnefoy, Vincent Bracco, Alexandre Govin, et al.. Fluidization and rheological approaches for characterization of wood biomass flowability. MAPI (Multiscale Approaches for Process Innovation, Jan 2012, Lyon, France. ⟨hal-00667275⟩
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