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Synthesis gas production by continuous biomass gasification in fluidized bed reactor : chemical characterization of the heavy organic compounds produced during the gasification process

Abstract : Gasification could be defined as a group of processes that converts solid or liquid fuels into a combustible gas. Therefore, biomass gasification can be employed to meet different market needs. Among the different gasification technologies available, fluidized bed gasifiers are very attractive because they take the advantage of the excellent mixing characteristics and high reaction rates of gas-solid mixtures. Miscanthus x giganteus (mxg) pellets and crushed and sieved almond shells have been used as biomass feedstock. Comparing the results obtained using the two biomasses at analogous operating conditions, no significant differences concerning the gas yield, gas composition and tar content could be observed. During the work, innovative catalytic hot gas filters for in-situ tar and particulate abatement, as well as two interesting Ni and Fe based catalyst have were tested in real gasification conditions. Further improvements have been obtained by combining the synergic catalytic effect of Fe-olivine and the catalytic filter candle, resulting in a efficient Tar abatement (-92% in the producer gas), and a consequently increase of gas yield by 72%. Also, the use of catalytic filter allows efficient particle separation so that the final result is a hot and clean fuel gas made available right at the exit of the gasifier reactor. The composition of tar was followed by HPLC as reference method. Other methods like HPTLC allow the separation of aromatic compounds according their number of aromatic rings. Quantification without separation was validated in order to control on line the production of tar during the gasification process
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Manuela Di Marcello. Synthesis gas production by continuous biomass gasification in fluidized bed reactor : chemical characterization of the heavy organic compounds produced during the gasification process. Other. Université Paul Verlaine - Metz, 2011. English. ⟨NNT : 2011METZ005S⟩. ⟨tel-01748811⟩

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