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Kinetics of gas hydrate formation from mixtures of methane and ethane
Affiliation:1. State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, PR China;2. Key Lab of Enhanced Heat Transfer and Energy Conservation, Ministry of Education, South China University of Technology, Guangzhou 510640, PR China;3. Center for Hydrate Research, Chemical & Biological Engineering Department, Colorado School of Mines, Golden, CO 80401, USA;1. Department of Chemical and Energy Engineering, Curtin University Malaysia, CDT 250, Miri 98009, Sarawak, Malaysia;2. GFZ German Research Centre for Geosciences, Telegrafenberg 14473, Potsdam, Germany;3. Discipline of Chemical Engineering, School of Engineering, University of KwaZulu-Natal, Howard College Campus, King George, V Avenue, Durban 4041, South Africa;1. Gas Hydrate and Flow Assurance Laboratory, Petroleum Engineering Program, Department of Ocean Engineering, Indian Institute of Technology Madras, Chennai 600 036, India;2. Department of Chemistry, Indian Institute of Technology Madras, Chennai 600 036, India;1. Fluid Science & Resources, School of Engineering, University of Western Australia, 35 Stirling Highway, Perth, WA 6009, Australia;2. Shell Global Solutions International B.V, P.O. Box 3800, 1030 BN Amsterdam, Netherlands;3. Shell International Exploration and Production Inc., P.O. Box 432, 3333 Highway 6 South, Houston, TX 77210, USA
Abstract:Experimental data on the kinetics of formation of gas hydrates from three mixtures of gaseous methane and ethane are reported. the experiments were conducted in a semi-batch stirred tank reactor at temperatures from 273 to 284 K and of pressures from 0.68 to 5.60 MPa. An intrinsic kinetic model for the growth of the gas hydrate is proposed. It is extension of the model for pure component hydrate formation. The model is based on the crystallization theory coupled with the two-film theory for the gas absorption into the liquid phase. the model does not contain any adjustable parameters. The kinetic rate constants which appear in the model are those obtained previously from pure component formation data. The results indicate that the formation rate is proportional to a lienar combination of the differences in the fugacities of the dissolved gases and their three-phase equilibrium fugacities at the experimental temperature. The effect of the mixture composition is taken into account indirectly through the computation of the three-phase equilibrium conditions and of the fugacities. the total gas consumption rate is proportional to the second moment of the particle size distribution.
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