Etude découplée des phénomènes physicochimiques impliqués dans les réacteurs de gazéification de la biomasse. Application au cas d'un lit fluidisé double

Abstract : Among the biomass gasification technologies, the dual fluidized bed gasifier may be used to produce a methane-rich syngas. Analysis of all the physicochemical phenomena involved inside the gasifier is difficult because they all occur simultaneously. In this thesis, the main chemical reactions are decoupled and studied independently one of each other at the scale of original laboratory facilities in thermal conditions close to those encountered in the gasifier. Intraparticular reactions of biomass pyrolysis and gas/solid reactions (char-steam gasification and catalytic thermal cracking of vapors on olivine) are carried out with an image furnace. Experiments related to gas-phase vapors thermal cracking are performed inside a continuous self stirred tank reactor. All the products formed by the reactions are recovered and analyzed. Mass balance closures are achieved accurately. Controlling steps of each reaction are discussed on the basis of a characteristic times analysis. Kinetic parameters are determined according to both processes modelings and optimizations from the experimental results. Different ways of possible methane formation and consumption mechanisms are identified and discussed. The gasifier is modelled by considering a single-particle model (primary pyrolysis reactions), secondary reactions, solids and gas-phase hydrodynamics and transfers. Finally, the decoupling methodology is validated from the comparison of model results with measurements performed at the 8 MW Güssing gasifier (Austria)
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Olivier Authier. Etude découplée des phénomènes physicochimiques impliqués dans les réacteurs de gazéification de la biomasse. Application au cas d'un lit fluidisé double. Autre. Institut National Polytechnique de Lorraine, 2010. Français. ⟨NNT : 2010INPL015N⟩. ⟨tel-01748796⟩

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