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Étude des coulis d'hydrates de CO2 en présence d'additifs pour la réfrigération secondaire

Abstract : Clathrate hydrate slurries are promising systems in the field of cold distribution for secondary refrigeration applications. Theses slurries can be generated by direct gas (ex. CO2) injection into a precooled liquid, thus avoiding mechanical methods. The goal of the present work is to study how additives can improve flowing and formation conditions of clathrate hydrate slurries. Firstly is studied the influence of tetrahydrofuran (THF) addition on the thermodynamics properties of the CO2-H2O system under mixed THF+CO2 hydrate formation conditions. Differential Scaning Calorimetry, DSC, at controlled pressure was employed as experimental method. Experimental results (formation temperature conditions, dissociation enthalpy and heat capacity for differents CO2 pressures and THF concentrations) were compared with a model combining the van der Waals and Platteeuw approach with the RKS equation of state associated to a MHV2 mixing rule and UNIFAC model. Formation and flowing conditions of CO2 hydrate slurry in the presence of additives were also investigated. An experimental setup allowing pressure drop and flowrate measurements was employed. After a phenomenological studies concerning conditions of slurry production and flowing, a selection of additives was made to improve these conditions. Finaly, a rheological characterisation of the CO2 hydrate slurry in the presence of the best additive completed this work.
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Submitted on : Friday, March 25, 2011 - 2:50:27 PM
Last modification on : Wednesday, May 11, 2022 - 3:22:02 PM
Long-term archiving on: : Thursday, November 8, 2012 - 12:35:08 PM


  • HAL Id : pastel-00579945, version 1



Maria del Carmen Martinez Valentin-Gamazo. Étude des coulis d'hydrates de CO2 en présence d'additifs pour la réfrigération secondaire. Génie des procédés. École Nationale Supérieure des Mines de Paris, 2009. Français. ⟨NNT : 2009ENMP1625⟩. ⟨pastel-00579945⟩



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