Determination of particle exchange rates at over-flow weirs in horizontal fluidised beds by particle tracking velocimetry--颗粒学报PARTICUOLOGY

Meyer, K., Bück, A., & Tsotsas, E. (2017). Determination of particle exchange rates at over-flow weirs in horizontal fluidised beds by particle tracking velocimetry. Particuology, 32, 1-9. https://doi.org/10.1016/j.partic.2016.09.007

Determination of particle exchange rates at over-flow weirs in horizontal fluidised beds by particle tracking velocimetry

Katja Meyer, Andreas Bück ^*, Evangelos Tsotsas

Thermal Process Engineering, Otto von Guericke University Magdeburg, Universitätsplatz 2, D-39106 Magdeburg, Germany

10.1016/j.partic.2016.09.007

Volume 32, June 2017, Pages 1-9

Received 2 August 2016, Revised 15 September 2016, Accepted 28 September 2016, Available online 1 February 2017, Version of Record 20 April 2017.

E-mail: andreas.bueck@ovgu.de

Highlights

• Particle exchange rates at weirs in horizontal fluidised beds were studied.

• PTV-based methodology and a batch pseudo-2D fluidised bed were used.

• Particle exchange and internal circulation were investigated under various fluidisation conditions.

Abstract

Residence time distributions (RTDs) in horizontal fluidised beds have a huge effect on solid product properties and are influenced by the internal design of the apparatus, e.g. the separation into different compartments by weirs. Weirs can be passed in or against the overall solid transport direction, with the back-flow resulting in axial dispersion, which is a measure of the spread of the RTD. Therefore, the ratio of exchange rates at weirs under different fluidisation conditions provides information on axial dispersion. In this work, a methodology based on particle tracking velocimetry is presented to obtain information on the exchange rates of particles at weirs in horizontal fluidised beds. The internal recirculation is studied for over-flow weirs with respect to different fluidisation conditions, providing a first step towards determining the effects of weirs and fluidisation conditions on axial dispersion and RTDs in horizontal fluidised beds.

Graphical abstract

Keywords

Particle tracking velocimetry; Horizontal fluidised bed; Axial dispersion; Granulation; Drying

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