A hydrodynamic model for flighted rotary kilns used for convertion of cohesive uranium powders

TLDR: The axial and transverse solid distribution of a cohesive powder in flighted rotary kilns was calculated from an original method based on the lifter discharge law previously determined, geometrical calculations and supplementary measurements (in particular the fall velocity of the powder at high temperature) as discussed by the authors.

About: This article is published in Chemical Engineering Science.The article was published on 2013-12-18 and is currently open access. It has received 13 citations till now. The article focuses on the topics: Kiln.

Figures

Fig. 1. Geometrical symbols used.

Fig. 8. Solid distribution in nominal operating conditions of kiln #1; molar flow rates obtained from the mass transfer model (Debacq, 2001).

Fig. 7. (a) In green/black: flighted powder fraction versus hold-up; in red/grey: powder fraction falling through the gas versus hold-up (U3O8, dimensions of kiln #2, = 7 rpm). (b) Powder fraction falling through the gas versus rotational speed (U3O8, dimensions of kiln #1, Z = 30,8%).

Fig. 9. Solid distribution in nominal operating conditions of kiln #2; molar flow rates obtained from the mass transfer model (Debacq, 2001).

Fig. 5. Instantaneous powder fraction falling through the gas versus time during 1 + 1/n revolution (UO2F2 in kiln #1, = 2 rpm).

Fig. 6. Total flighted powder fraction versus angular position during one revolution (UO2F2 in kiln #1).

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The axial and transverse distribution of a cohesive powder in flighted rotary kilns was calculated from an original method based on the lifter discharge law previously determined, geometrical calculations and supplementary measurements ( in particular the fall velocity of the powder at high temperature ) this paper.