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Pyrolyse flash à haute température de la biomasse ligno-cellulosique et de ses composés : production de gaz de synthèse

Abstract : Pyrolysis is the first stage of any thermal treatment of biomass and governs the formation of synthesis gas for the production of electricity, hydrogen or liquid fuels. The objective of this work is to establish a link between the composition of a biomass and its pyrolysis gas. We study experimental flash pyrolysis and fix the conditions in which quantities of gas are maximal, while aiming at a regime without heat and mass transfer limitations (particles about 100 μm): temperature of 950°C and residence time of about 2 s. Then we try to predict gas yields of any biomass according to its composition, applicable in this situation where thermodynamic equilibrium is not reached. We show that an additivity law does not allow correlating gas yields of a biomass with fractions of cellulose, hemicellulose and lignin contained in this biomass. Several explanations are suggested and examined: difference of pyrolytic behaviour of the same compound according to the biomass from which it is extracted, interactions between compounds and influence of mineral matter. With the aim of industrial application, we study pyrolysis of millimetric and centimetric size particles, and make a numerical simulation of the reactions of pyrolysis gases reforming. This simulation shows that the choice of biomass affects the quantities of synthesis gas obtained.
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  • HAL Id : tel-00271260, version 1

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Carole Couhert. Pyrolyse flash à haute température de la biomasse ligno-cellulosique et de ses composés : production de gaz de synthèse. Energie électrique. École Nationale Supérieure des Mines de Paris, 2007. Français. ⟨NNT : 2007ENMP1531⟩. ⟨tel-00271260⟩

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