Etudes expérimentale et numérique de la pyrolyse oxydante de la biomasse en lit fixe

Abstract : Wood Multi-staged gasification in a fixed bed reactor is suitable for small-scale electricity generation. In these processes, the pyrolysis is performed in a continuous downward fixed bed reactor. The main feature of this reactor is the autothermal operation. Energy for heating, drying and pyrolysis is supplied by partial combustion of wood, known as “oxidative pyrolysis”. The air introduced from the top of the reactor induces a combustion front that propagates countercurrent with the solids and gazes flows. The work presented in this document aimed to achieve a better description of this process. A multi-scale approach was considered. Therefore, we have firstly studied the behavior of an isolated particle before focusing on the overall fixed bed. At the particle scale, we have quantified the effect of oxygen and of particle size on the oxidative pyrolysis kinetics. This led us to the setup of a kinetic model for this transformation.At the fixed bed scale, the propagation of the combustion front was studied considering the experimental and numerical approaches, which provides a better understanding of this step of the wood staged gasifiers.
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Elias Daouk. Etudes expérimentale et numérique de la pyrolyse oxydante de la biomasse en lit fixe. Génie des procédés. Ecole des Mines de Nantes, 2015. Français. ⟨NNT : 2015EMNA0241⟩. ⟨tel-01278968⟩



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