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Etude cinétique du reformage thermique des produits issus de la gazéification de la biomasse

Abstract : Advanced applications, such as catalytic production of liquid fuels, request a high quality synthesis gas. Biomass may be a promising feedstock but the syngas needs to be drastically cleaned to reach the specifications. The high temperature homogeneous reforming (> 1300 K) seems a credible alternative to the catalytic way. The reforming kinetic at high temperatures in a reducing atmosphere has to be understood. If detailed mechanisms already exist for the combustion of hydrocarbons, sensitive reactions are different in this case. An experimental and modelling study of the steam cracking of small hydrocarbons have been performed. The experiments have been done in a plug flow reactor under atmospheric pressure. The kinetic influence of different gases of the syngas on the hydrocarbons conversion has been investigated. The behaviour of representative complex mixtures has been also studied as a function of the temperature. The most difficult species to reform is methane: temperature as high as 1700 K is necessary. A model derived from that for the combustion of light hydrocarbons was developed. The experimental trends are well reproduced. Carbon reforming appends mainly by reaction of OH radicals with unsaturated C molecules, which are soot precursors. Process conditions necessary for high temperature methane reforming would then be favourable to undesirable soot formation
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Hélène Hiblot. Etude cinétique du reformage thermique des produits issus de la gazéification de la biomasse. Autre. Institut National Polytechnique de Lorraine, 2010. Français. ⟨NNT : 2010INPL028N⟩. ⟨tel-01748799⟩

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