Modeling biomass char gasification kinetics for improving prediction of carbon conversion in a fluidized bed gasifier

FUEL

卷:132

Article

Kramb, Jason¹  Konttinen, Jukka¹  Gomez-Barea, Alberto²  Moilanen, Antero³  Umeki, Kentaro⁴ 

[1] Univ Jyvaskyla, Dept Chem Renewable Nat Resources & Chem Living E, FI-40014 Jyvaskyla, Finland

[2] Univ Seville, Escuela Tecn Super Ingn, Chem & Environm Engn Dept, Bioenergy Grp, Seville 41092, Spain

[3] VTT Tech Res Ctr Finland, Espoo 02044, Finland

[4] Univ Lulea, Dept Engn Sci & Math, Div Energy Sci, S-97187 Lulea, Sweden

关键词: Biomass;    Gasification;    Reaction kinetics;    Modeling;    Fluidized bed;   

DOI  :  10.1016/j.fuel.2014.04.014

来源: Elsevier

【 摘 要 】

Gasification of biomass in a fluidized bed (FB) was modeled based on kinetic data obtained from previously conducted thermogravimetric analysis. The thermogravimetric analysis experiments were designed to closely resemble conditions in a real FB gasifier by using high sample heating rates, in situ devolatilization and gas atmospheres of H2O/H-2 and CO2/CO mixtures. Several char kinetic models were evaluated based on their ability to predict char conversion based on the thermogravimetric data. A modified version of the random pore model was shown to provide good fitting of the char reactivity and suitability for use in a reactor model. An updated FB reactor model which incorporates the newly developed char kinetic expression and a submodel for the estimation of char residence time is presented and results from simulations were compared against pilot scale gasification data of pine sawdust. The reactor model showed good ability for predicting char conversion and product gas composition. (C) 2014 Elsevier Ltd. All rights reserved.

【 授权许可】

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