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

Florence Vanni 1, 2 Brigitte Caussat 2 Carine Ablitzer 1 Méryl Brothier 1
1 LCU - Laboratoire des Combustibles Uranium
SA3E - Service d'Analyses, d'Elaboration, d'Expérientations et d'Examens des combustibles : DEN/DEC/SA3E
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.
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Submitted on : Friday, December 3, 2021 - 3:47:18 PM
Last modification on : Saturday, December 4, 2021 - 3:57:14 AM

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Florence Vanni, Brigitte Caussat, Carine Ablitzer, Méryl Brothier. Effects of reducing the reactor diameter on the fluidization of a very dense powder. Powder Technology, Elsevier, 2015, 277, pp.268-274. ⟨10.1016/j.powtec.2015.03.010⟩. ⟨hal-03465033⟩

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