PEPT study of particle motion for different riser exit geometries--颗粒学报PARTICUOLOGY

Chan, C. W., Brems, A., Mahmoudi, S., Baeyens, J., Seville, J., Parker, D., Leadbeater, T., & Gargiuli, J. (2010). PEPT study of particle motion for different riser exit geometries. Particuology, 8(6), 623-630. https://doi.org/10.1016/j.partic.2010.08.006

PEPT study of particle motion for different riser exit geometries

Chian Wen Chan ^a, Anke Brems ^b, Shiva Mahmoudi ^a, Jan Baeyens ^a, Jonathan Seville ^a *, David Parker ^c, Thomas Leadbeater ^c, Joseph Gargiuli ^c

a University of Warwick, School of Engineering, Coventry, CV4 7 AL, UK
b Katholieke Universiteit Leuven, Department of Chemical Engineering, de Croylaan, 46, 3001, Leuven, Belgium
c University of Birmingham, School of Physics and Astronomy, Birmingham, B22 T15, UK

10.1016/j.partic.2010.08.006

Volume 8, Issue 6, December 2010, Pages 623-630

Received 28 July 2010, Accepted 15 August 2010, Available online 5 November 2010.

E-mail: J.P.K.Seville@warwick.ac.uk

Highlights

Abstract

Laboratory and industrial risers are equipped with exits of many different layouts, and numerous publications discuss the influence of riser exit geometry on local and overall solids hydrodynamics in the riser. The present paper reviews literature findings—mostly based upon indirect experimental techniques and often somewhat contradictory. Direct measurement of particle velocity and particle occupancy near and in the riser exit provide a better indication of the effect of riser exit geometry. Positron Emission Particle Tracking (PEPT) was used in this work for the first time to investigate the exit region of the riser. An abrupt or sharp exit causes particles to be knocked out of the gas flow, so forming a recirculation or reflux region in the upper part of the riser. This is much less pronounced with a curved or gradual exit.

Graphical abstract

Keywords

CFB; Riser; Exit geometries; Positron Emission Particle Tracking

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