Journal
FUEL PROCESSING TECHNOLOGY
Volume 126, Issue -, Pages 366-382Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.fuproc.2014.05.020
Keywords
Biomass pyrolysis; Downer reactor; Gas-solid separation; CFD modeling; Hydrodynamics
Funding
- Leverhulme Trust [RPG-410]
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This study presents the first part of a CFD study on the performance of a downer reactor for biomass pyrolysis. The reactor was equipped with a novel gas-solid separation method, developed by the co-authors from the ICFAR (Canada). The separator, which was designed to allow for fast separation of clean pyrolysis gas, consisted of a cone deflector and a gas exit pipe installed inside the downer reactor. A multi-fluid model (Eulerian-Eulerian) with constitutive relations adopted from the kinetic theory of granular flow was used to simulate the multiphase flow. The effects of the various parameters including operation conditions, separator geometry and particle properties on the overall hydrodynamics and separation efficiency were investigated. The model prediction of the separator efficiency was compared with experimental measurements. The results revealed distinct hydrodynamic features around the cone separator, allowing for up to 100% separation efficiency. The developed model provided a platform for the second part of the study, where the biomass pyrolysis is simulated and the product quality as a function of operating conditions is analyzed. Crown Copyright (C) 2014 Published by Elsevier B.V. All rights reserved.
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