Étude et modélisation des conditions d'échanges dans les colonnes de distillation diabatiques : étude de la distribution de fluides

Joelle Rizk 1
1 CEP/Paris
CEP - Centre Énergétique et Procédés
Abstract : Distillation columns are one of the main methods used for separating the components of the air. Their inconvenient is the high energy consumption. In order to produce the oxygen needed for oxycombustion with low energy costs, a diabatic distillation column for cryogenic air separation is designed and modeled. It consists of a shell and tubes heat exchanger where the tubes constitute a first column operating at low pressure and the shell a second one operating at high pressure. Coupled mass and heat transfers are modeled and the diabatic column simulated. A comparative exergy analysis between three types of distillation columns for cryogenic air separation shows that the exergy efficiency of the diabatic column designed is 23 % higher than that of the conventional double columns. The distribution of the mixtures in the tubes and the shell is a key point in the distillation process in the shell and tubes heat exchanger. The different forms of uneven distribution are studied and solutions are proposed. A pilot is designed in order to validate experimentally the theoretical concept of diabatic distillation of cryogenic air.
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Joelle Rizk. Étude et modélisation des conditions d'échanges dans les colonnes de distillation diabatiques : étude de la distribution de fluides. Génie des procédés. École Nationale Supérieure des Mines de Paris, 2010. Français. ⟨NNT : 2010ENMP0064⟩. ⟨pastel-01003516⟩

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