Experimental and modelling study of volatile species released in biomass torrefaction based on extracted cellulose, hemicelluloses and lignin
Résumé
Torrefaction is a mild thermal treatment (200-300 °C, depleted-oxygen atmosphere) suitable for dry biomass. The main products are a torrefied solid, with properties closer to those of coal, and gaseous species, including permanent gases, volatile species and water. The study of volatile species released in torrefaction can contribute to explain biomass degradation mechanisms, as well as to identify the optimal operating conditions to enhance high-added value volatile species production. Furthermore, certain volatile species can be recovered as a source of high-added-value products. Up to now, condensable species recovery is limited due to the complexity of predicting the composition and separating the gaseous mixture. The heterogeneity of volatile species release in torrefaction is the main challenge to propose an accurate predictive model. Moreover, the suitability of using commercial compounds as biomass macromolecular component models was questioned. The objective of this work is determining production profiles in function of temperature for the main volatile species released in biomass torrefaction. Production profiles will be linked to biomass degradation mechanisms in the literature and thus constitute the basis for a predictive model of volatile species release dependant on the main operating conditions, biomass type and composition.
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