Reference : Numerical study of the influence of particle size and packing on pyrolysis products u...
Scientific journals : Article
Engineering, computing & technology : Materials science & engineering
http://hdl.handle.net/10993/33157
Numerical study of the influence of particle size and packing on pyrolysis products using XDEM
English
Mahmoudi, Amir Houshang mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit]
Hoffmann, F. [InuTech GmbH, Fuerther Strasse 212, Nuremberg, Germany]
Peters, Bernhard mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit]
Besseron, Xavier mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit]
2016
International Communications in Heat & Mass Transfer
Pergamon Press - An Imprint of Elsevier Science
71
20-34
Yes (verified by ORBilu)
International
0735-1933
[en] Biomass ; Numerical study ; Parameter study ; Particle size ; Pyrolysis ; Validation ; XDEM ; Biofuels ; Conservation ; Flow of fluids ; Lagrange multipliers ; Porous materials ; Conservation equations ; La-grangian approaches ; Numerical methodologies ; Parameter studies ; Three-dimensional flow ; Packed beds
[en] Conversion of biomass as a renewable source of energy is one of the most challenging topics in industry and academy. Numerical models may help designers to understand better the details of the involved processes within the reactor, to improve process control and to increase the efficiency of the boilers. In this work, XDEM as an Euler-Lagrange model is used to predict the heat-up, drying and pyrolysis of biomass in a packed bed of spherical biomass particles. The fluid flow through the void space of a packed bed (which is formed by solid particles) is modeled as three-dimensional flow through a porous media using a continuous approach. The solid phase forming the packed bed is represented by individual, discrete particles which are described by a Lagrangian approach. On the particle level, distributions of temperature and species within a single particle are accounted for by a system of one-dimensional and transient conservation equations. The model is compared to four sets of experimental data from independent research groups. Good agreements with all experimental data are achieved, proving reliability of the used numerical methodology. The proposed model is used to investigate the impact of particle size in combination with particle packing on the char production. For this purpose, three setups of packed beds differing in particle size and packing mode are studied under the same process conditions. The predicted results show that arranging the packed bed in layers of small and large particles may increase the final average char yield for the entire bed by 46 %. © 2015 Elsevier B.V.
http://hdl.handle.net/10993/33157
10.1016/j.icheatmasstransfer.2015.12.011

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