Traitement thermique du bois en vue de sa valorisation énergétique : effet de l'intensité de traitement sur la composition chimique, les propriétés énergétiques et la résilience mécanique

Abstract : Biofuels are developed worldwide since the few last decades to face two major problems of our societies: global warming and peak oil. Due to many disadvantages of the first generation of biofuel, a second generation is developed, whose major advantage is to use the lignocellulosic part of plants. One interesting way to produce this kind of biofuel is a gasification followed by a Fisher-Tropsch synthesis. However, a pretreatment is needed because raw biomass is not suitable for a direct use in gasifier. The role of the pretreatment is to homogenize product properties, to ease storage and transport, to concentrate the energy content. Moreover, its grindability has also to be improved since fine particles are required to supply the gasifier. The present work proposes a comprehensive chemical, energetic and mechanical characterization of wood (Pinus pinaster and Quercus robur) with different treatment intensities (T°C<300°C). The first part proposes a full set of chemical and energy analysis on heat-treated woods. The mass loss was confirmed as a synthetic indicator of the effect of treatment intensity on the degree of chemical degradation and energy concentration. Therefore, analytical expressions allowing the prediction of energy and chemical properties as a function of the overall mass loss are provided. The second part of the work consists in the development and use of a novel impact device. Results obtained in radial and tangential directions show that the heat treatment improves the wood grindability. As the treatment intensity increases, wood first losses its resilience first, followed by a loss of its fibrous behavior. The later eases its transformation into small particles suitable for gasification process.
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Floran Pierre. Traitement thermique du bois en vue de sa valorisation énergétique : effet de l'intensité de traitement sur la composition chimique, les propriétés énergétiques et la résilience mécanique. Sciences agricoles. AgroParisTech, 2011. Français. ⟨NNT : 2011AGPT0081⟩. ⟨pastel-01066141⟩

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