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High-temperature Kinetics of Fine Biomass Char Particles in Air and CO2
Linnaeus University, Faculty of Science and Engineering, School of Engineering. (Bioenergy)
Linnaeus University, Faculty of Science and Engineering, School of Engineering.
Linnaeus University, Faculty of Science and Engineering, School of Engineering.
2010 (English)In: 18th European Biomass Conference and Exhibition: From Research to Industry and Markets, 2010Conference paper, Published paper (Refereed)
Abstract [en]

Knowledge of reliable chemical kinetics of char always plays significant roles in the modelling, design and optimization of processes during biofuel thermochemical conversions.The determination of reaction kinetics of char in the high-temperature range still highly depends on the extrapolation of results from kinetic data determined at lower temperatures due to mass and heat transfer limitations. In this work an aerosol-based method was used to investigate the reactivity of singly-distributed char particles with aerodynamic diameters between 0.5-10 mm. The conversion of char particles in the reactor at varying temperatures and residence time was determined by comparing the particle size distributions before and after passing the reactor, using an aerodynamic particle sizer (APS) spectrometer. The results of char particles reacted with air, CO2 and steam indicate that the aerosol-based method can be used to determine reaction kinetics of char particles in the high temperature range where reaction is controlled by diffusion limitation if using conventional thermogravimetric analysis (TGA). By combining the aerosol-based method and conventional TGA, the oxidation and gasification kinetic parameters of biomass char can be derived in the temperature range of 350-800ºC, and 800-1200ºC respectively. The aerosol-based method shows the potential of on-line measuring the char reactivity.

Place, publisher, year, edition, pages
2010.
National Category
Engineering and Technology
Research subject
Technology (byts ev till Engineering)
Identifiers
URN: urn:nbn:se:lnu:diva-6965ISBN: 978-88-89407-56-5 (print)OAI: oai:DiVA.org:lnu-6965DiVA, id: diva2:337722
Available from: 2010-08-09 Created: 2010-08-04 Last updated: 2014-05-08Bibliographically approved

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