Effects of reducing the reactor diameter on the fluidization of a very dense powder
In: Powder Technology, Jg. 277 (2015-06-01), S. 268-274
Online
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Zugriff:
International audience; The impact of decreasing the column diameter from 5 to 2 cm has been studied on the fluidization of a very densepowder 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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Effects of reducing the reactor diameter on the fluidization of a very dense powder
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Autor/in / Beteiligte Person: | Vanni, Florence ; Brothier, Meryl ; Caussat, Brigitte ; Ablitzer, Carine ; Laboratoire des Combustibles Uranium (LCU) ; Service d'Analyses, d'Elaboration, d'Expérientations et d'Examens des combustibles (SA3E) ; Département d'Etudes des Combustibles (DEC) ; CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)) ; Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)) ; Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Département d'Etudes des Combustibles (DEC) ; Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) ; Laboratoire de génie chimique [ancien site de Basso-Cambo] (LGC) ; Université Toulouse III - Paul Sabatier (UT3) ; Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP) ; Université Fédérale Toulouse Midi-Pyrénées ; Commissariat à l'Energie Atomique et aux énergies alternatives - CEA (FRANCE) ; Centre National de la Recherche Scientifique - CNRS (FRANCE) ; Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE) ; Université Toulouse III - Paul Sabatier - UT3 (FRANCE) ; Laboratoire de Génie Chimique (LGC) ; Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP) ; Université de Toulouse (UT) |
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Zeitschrift: | Powder Technology, Jg. 277 (2015-06-01), S. 268-274 |
Veröffentlichung: | Elsevier BV, 2015 |
Medientyp: | unknown |
ISSN: | 0032-5910 (print) |
DOI: | 10.1016/j.powtec.2015.03.010 |
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