Évaluation de la ségrégation de la biomasse dans un lit fluidisé et modélisation globale du procédé de gazéification

Abstract : The increasing population in the world leads to increasing energy demand. In order to limit emissions of fossil carbon dioxide, a solution is to develop renewable energy alternatives. In this context, the use of biomass is one of the solutions to study. It is in this context that implemented the project ANR GAMECO by a consortium of academic and industrial. This project aims to make reliable use of a bubbling fluidized bed of gasification with air to convert lignocellulosic biomass into synthesis gas. This PhD work aims to address one of the problems of this project: the distribution of biomass and char particles in the fluidized bed and the impact of these distributions when modeling of the gasifier. The study focused on mixtures containing olivine and wood particles of different characteristics. Mixing-segregation results were obtained through measurements in a cold model developed during this PhD work. The obtained experimental data were used to validate and consolidate existing hydrodynamic mixing model of the literature. The last step of the thesis consists in establishing a global model of the fluidized bed reactor for gasification of biomass. This model incorporates the previous hydrodynamic results, coupled with chemical reactions models describing biomass conversion (pyrolysis, oxy-coal gasification tar cracking) after the literature. The results of this model are then compared with results obtained on a hot model
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Benjamin Cluet. Évaluation de la ségrégation de la biomasse dans un lit fluidisé et modélisation globale du procédé de gazéification. Autre. Université de Lorraine, 2014. Français. ⟨NNT : 2014LORR0352⟩. ⟨tel-01751651⟩

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