Hydrate formation during CO2 transport: Predicting water content in the fluid phase in equilibrium with the CO2-hydrate |
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| Authors: | Hailong Li Jana P Jakobsen Jacob Stang |
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| Institution: | 1. Department of Chemical Engineering, Tarbiat Modares University, P.O. Box 14115-311, Tehran, Iran;2. Institut de Recherche en Génie Chimique et Pétrolier (IRGCP), Paris Cedex, France;3. Thermodynamics Research Unit, School of Chemical Engineering, University of KwaZulu-Natal, Howard College Campus, King George V Avenue, Durban 4041, South Africa;1. School of Physics and Technology, University of Jinan, Jinan 250022, PR China;2. Shandong Academy of Environmental Science, Jinan 250013, PR China;3. School of Petroleum Engineering, China University of Petroleum, Qingdao 266580, PR China;4. College of Science, China University of Petroleum, Qingdao 266580, PR China;1. Irstea, UR GPAN, 1 rue Pierre-Gilles de Gennes, 92761 Antony, France;2. Léonard de Vinci Pôle Universitaire, Research Center, 92 916 Paris La Défense, France;1. Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, South Korea;2. Department of Energy Resources Engineering, Stanford University, 367 Panama Street, Stanford, CA 94305, United States;3. Graduate School of EEWS (Energy, Environment, Water and Sustainability), Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, South Korea;1. Thermodynamics, Ruhr-Universität Bochum, Universitätsstr. 150, 44801 Bochum, Germany;2. Faculty of Mechanical Science and Engineering, Institute of Power Engineering, Technische Universität Dresden, Helmholtzstraße 14, 01069 Dresden, Germany;3. Institute of Thermomechanics of the CAS, v. v. i., Dolej?kova 1402, 182 00 Prague 8, Czech Republic |
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| Abstract: | In order to evaluate the risk of hydrate formation in CO2 transport one has to be able to predict the water content in the fluid phase in equilibrium with the CO2-hydrate. A literature review has identified some knowledge gaps, for example, there are no results available at temperatures lower than 243.15 K (?30 °C); and none of the models found in literature predicts the water content with high accuracy. A model based on equality of water fugacity in fluid and hydrate phase is presented here and used for the predictions of water content in equilibrium with hydrates. Although this model gives better accuracy in the overall temperature and pressure ranges of measurements than the models found in the literature, it is not accurate enough to satisfy the requirements of CO2 transport. The simulation results also show that it is possible to form hydrate at low water content, such as xw = 50 vppm, if temperature is low enough. In order to verify the results and improve the model accuracy further, more experimental data in a larger temperature and pressure region are required. |
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