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Effects of reducing the reactor diameter on the fluidization of a very dense powder

Vanni, Florence and Caussat, Brigitte and Ablitzer, Carine and Brothier, Méryl Effects of reducing the reactor diameter on the fluidization of a very dense powder. (2015) Powder Technology, vol. 277. pp. 268-274. ISSN 0032-5910

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Official URL: http://dx.doi.org/10.1016/j.powtec.2015.03.010

Abstract

The impact of decreasing the column diameter from 5 to 2 cm has been studied on the fluidization of a very dense powder both at ambient and high temperature. The final objective was to coat very dense nuclear fuel particles with silicon using a Fluidized Bed Chemical Vapo Deposition (FB-CVD) process with bed weights as low as possible. A surrogate tungsten powder, 19300 kg/m3 in density, was used. Wall effects only appeared in the column with a 2 cm diameter. This was evidenced by an increase in the hysteretic behavior of the pressure drop curves and an increase of the minimum fluidization velocity, as well as by a decrease in the bed voidage. This critical diameter is higher than those found elsewhere for Geldart's group A and B powders, which is probably due to the very high density of the tungsten powder that increases the friction forces in the bed. Satisfactory thermal conditions were reached at 650 °C in a reactor with a 3 cm diameter using only 740 g of powder, thereby opening the way for future silicon coating experiments.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Powder Technology website : http://dx.doi.org/10.1016/j.powtec.2015.03.010
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Commissariat à l'Energie Atomique et aux énergies alternatives - CEA (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS (FRANCE)
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Deposited By: Brigitte CAUSSAT-BONNANS
Deposited On:09 Apr 2015 09:29

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