Gas hydrate equilibria for CO<sub>2</sub>-N<sub>2</sub> and CO<sub>2</sub>-CH<sub>2</sub> gas mixtures, experiments and modelling - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2011

Gas hydrate equilibria for CO2-N2 and CO2-CH2 gas mixtures, experiments and modelling

Résumé

CO2 capture in industry is regarded as a possible tool that is suitable for reducing the global carbon emissions. The gases emitted by industry are by definition localized at the plants, like steelmaking plants, gas or coal power plants, chemical plants or natural gas production plants. Facing the variety of gases to be treated with regard to their quantities, qualities (mainly the CO2 content, but also the presence of minor impurities such as H2S, SO2, NOX....), and conditions of pressure and temperature, different strategies and technologies need to be developed to minimize the cost of the process. Hydrate technology could be used as an alternative approach to remove green house gases, and this is the route we try to develop here. A preliminary costing has revealed the process to be competitive for high concentrated mixtures of CO2 containing N2 such as found in exhaust gases of steel making plants at atmospheric pressure. This work presents a set of experimental data on the hydrate liquid vapour equilibria encountered in the mixtures of CO2-N2 and CO2-CH2 with pure water. We present in detail our experimental procedure by which the gas composition can be measured directly, whereas the hydrate composition is to be calculated from a mass balance. Furthermore we have tried to validate our experimental data by using the classical van der Waals and Platteeuw model with internal parameters found in the literature. These parameters are the so-called macroscopic parameters (i.e. macroscopic parameters from Table 3 which refer to a classical thermodynamic approach) and the so-called Kihara parameters (referring to a statistical thermodynamic approach). Due to large deviations between the modelled values obtained in the way described above and the experimental results, we have re-fitted the internal parameters, essentially by retaining a set of macroscopic parameters from Handa and Tse and re-fitting the Kihara parameters from our experimental results. Finally the new set of parameters is validated against experimental data from other sources available in the literature, or falsified against other sources.
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Dates et versions

hal-00617485 , version 1 (29-08-2011)

Identifiants

  • HAL Id : hal-00617485 , version 1

Citer

Jean-Michel Herri, Amina Bouchemoua, Matthias Kwaterski, Amara Fezoua, Yamina Ouabbas, et al.. Gas hydrate equilibria for CO2-N2 and CO2-CH2 gas mixtures, experiments and modelling. 7th International Conference on Gas Hydrates (ICGH 2011), Jul 2011, Edimbourg, United Kingdom. pp.435. ⟨hal-00617485⟩
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