A CFD study of biomass pyrolysis in a downer reactor equipped with a novel gas-solid separator - I: hydrodynamic performance

Xi Yu, Yassir Makkawi*, Raffaella Ocone, Martin Huard

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

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

Original languageEnglish
Pages (from-to)366-382
Number of pages17
JournalFuel Processing Technology
Volume126
Early online date9 Jun 2014
DOIs
Publication statusPublished - Oct 2014

Bibliographical note

NOTICE: this is the author’s version of a work that was accepted for publication in Fuel processing technology. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Yu, X, Makkawi, Y, Ocone, R & Huard, M, 'A CFD study of biomass pyrolysis in a downer reactor equipped with a novel gas–solid separator — I : Hydrodynamic performance' Fuel processing technology, vol 126 (2014) DOI http://dx.doi.org/10.1016/j.fuproc.2014.05.020

Keywords

  • biomass pyrolysis
  • CFD modeling
  • Downer reactor
  • gas-solid separation
  • hydrodynamics

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