The Effect of the Presence of Very Cohesive Geldart C Ultra-Fine Particles on the Fluidization of Geldart A Fine Particle Beds
by
Abbas Kamranian Marnani 1,*, Andreas Bück 2, Sergiy Antonyuk 3, Berend van Wachem 1, Dominique Thévenin 4
and Jürgen Tomas 1,†
Abbas Kamranian Marnani 1,*, Andreas Bück 2, Sergiy Antonyuk 3, Berend van Wachem 1, Dominique Thévenin 4 and Jürgen Tomas 1,†
1
Institute of Mechanical Process Engineering, Otto von Guericke University (OvGU), Universitätsplatz 2, 39106 Magdeburg, Germany
2
Institute of Particle Technology (LFG), Friedrich-Alexander-University Erlangen-Nürnberg, Cauerstraße 4, 91058 Erlangen, Germany
3
Institute of Particle Process Engineering, Technische Universität Kaiserslautern, Gottlieb-Daimler Street, 67663 Kaiserslautern, Germany
4
Institute of Fluid Dynamics and Thermodynamics, OvGU, Universitätsplatz 2, 39106 Magdeburg, Germany
*
Author to whom correspondence should be addressed.
†
Passed away. He has initiated and supervised the project.
Processes 2019, 7(1), 35; https://doi.org/10.3390/pr7010035
Received: 27 November 2018 / Revised: 31 December 2018 / Accepted: 5 January 2019 / Published: 11 January 2019
(This article belongs to the Special Issue Multiphase Reaction Engineering, Reactors and Processes )
The effect of the presence of ultra-fines (d < 10 μm) on the fluidization of a bed containing fine particles (d < 100 μm), is the subject of this paper. Practically, it can happen due to breakage or surface abrasion of the fine particles in some processes which totally changes the size distribution and also fluidization behaviour. The materials used in this study are both ground calcium carbonate (GCC); fine is CALCIT MVT 100 (Geldart’s group A) and ultra-fine is CALCIT MX 10 (group C). The experimental results for different binary mixtures of these materials (ultra-fines have 30%, 50%, or 68% of the total mixture weight) show that the physical properties of the mixtures are close to those of pure ultra-fine powders. Using mean values of the bed pressure drop calculated from several independent repetitions, the fluidization behaviour of different mixtures are compared and discussed. The fluidization behaviour of the mixtures is non-reproducible and includes cracking, channelling and agglomeration (like for pure ultra-fine powders). Increasing the portion of ultra-fine materials in the mixture causes a delay in starting partial fluidization, an increase in the bed pressure drop as well as a delay in reaching the peak point.
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Keywords:
fine particle; ultra-fine powders; binary mixtures; fluidization; agglomeration; cohesion
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MDPI and ACS Style
Kamranian Marnani, A.; Bück, A.; Antonyuk, S.; van Wachem, B.; Thévenin, D.; Tomas, J. The Effect of the Presence of Very Cohesive Geldart C Ultra-Fine Particles on the Fluidization of Geldart A Fine Particle Beds. Processes 2019, 7, 35.
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