Opération périodique des réacteurs catalytiques à lit fixe arrosé : étude expérimentale de l'hydrodynamique, de la conductivité thermique radiale et de la maldistribution de l'écoulement liquide

Abstract : The influence of periodic operation on the hydrodynamics in trickle-bed reactors, and on the related parameters, was studied experimentally in this work. Periodic operation consisted in a square-waved liquid feed. The pulse flow domain can be extended towards lower mean liquid velocities by a periodic liquid feed to has been observed experimentally that a tracer's residence time depends upon the moment of injection. This dependence is very well predicted when taking the propagation of continuity waves into account. The importance of the residence time variations during one feed cycle depends on the du ration of the cycle, with all other operating parameters constant. The plug flow character of the liquid does not seem to be deteriorated by periodic operation. No significant effect on the "natural" distribution of the liquid, measured at two different scales, has been observed. The effective radial thermal conductivity under periodic operation is of the same magnitude as the one measured under steady state conditions at the same mean liquid velocity.
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Theses
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http://docnum.univ-lorraine.fr/prive/INPL_T_2003_BORREMANS_D.pdf
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https://hal.univ-lorraine.fr/tel-01750107
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Submitted on : Thursday, March 29, 2018 - 12:38:00 PM
Last modification on : Thursday, January 31, 2019 - 1:27:49 AM

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Didier Borremans. Opération périodique des réacteurs catalytiques à lit fixe arrosé : étude expérimentale de l'hydrodynamique, de la conductivité thermique radiale et de la maldistribution de l'écoulement liquide. Alimentation et Nutrition. Institut National Polytechnique de Lorraine, 2003. Français. ⟨NNT : 2003INPL039N⟩. ⟨tel-01750107⟩

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