Contribution à la modélisation d’un gazeifieur de biomasse : application à un gazeifieur allothermique solaire pour la production de gaz de synthèse

Abstract : This work focuses on the modeling of biomass gasification in a solar fixed bed reactor. We developed and validated different modules to compute physical problems associated with such gasifier (finite volume, thermodynamic equilibrium, view factor, radiosity, evolution of the mesh, etc.). The reactor is then modeled, and results are compared to experimental measurements for its validation. These results suggest that for the operating conditions encountered in this reactor, the evolution of the heating rate and the ash concentration may influence the kinetics of the beech wood gasification. A study of the reactor by assuming thermodynamic equilibrium is conducted and shows that this approach should be used with caution for the studied temperature range. Parametric study of an air-air exchanger between the output and input gas is proposed. It shows that the addition of an inert gas can be interesting from an energy point of view in such conditions. Finally, a solar absorber suited to the reactor is modeled and validated in order to assess the sensitivity of the complete system.
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Valerian Freysz. Contribution à la modélisation d’un gazeifieur de biomasse : application à un gazeifieur allothermique solaire pour la production de gaz de synthèse. Thermique [physics.class-ph]. Université de La Rochelle, 2016. Français. ⟨NNT : 2016LAROS009⟩. ⟨tel-01661450⟩

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