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Phase Equilibrium Conditions of Gas Hydrates for Natural Gas Solid Transportation and Storage  

Jeon, Yong-Han (Department of Mechanical Engineering, Inha University)
Kim, Jong-Yoon (Department of Mechanical Engineering, Inha University)
Kim, Chong-Bo (Department of Mechanical Engineering, Inha University)
Kim, Nam-Jin (Department of Nuclear and Energy Engineering, Cheju National University)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.20, no.4, 2008 , pp. 266-273 More about this Journal
Abstract
Natural gas hydrates are ice-like solid substances, which are composed of water and natural gas, mainly methane. They have three kinds of crystal structures of five polyhedra formed by hydrogen-bonded water molecules, and are stable at high pressures and low temperatures. They contain large amounts of organic carbon and widely occur in deep oceans and permafrost regions. Therefore, they are expected as a potential energy resource in the future. Especially, $1m^3$ natural gas hydrate contains up to $172Nm^3$ of methane gas, de pending on the pressure and temperature of production. Such large volumes make natural gas hydrates can be used to store and transport natural gas. In this study, three-phase equilibrium conditions for forming natural gas hydrate were numerically obtained in pure water and single electrolyte solution containing 3 wt% NaCl. The results show that the predictions match the previous experimental values very well, and it was found that NaCl acts as an inhibitor. Also, help gases such that ethane, propane, i-butane, and n-butane reduce the hydrate formation pressure at the same temperature.
Keywords
Natural gas; Transportation; Storage; Gas hydrate; Phase equilibrium;
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  • Reference
1 Gudmundsson, J. S., Mork, M., and Graff, O. F., 2002, Hydrate Non-Pipeline Technology, Proceedings of the 4th International Conference on Gas Hydrate, Yokohama, pp. 997-1002
2 Kanda, H., 2006, Economics study on natural gas transportation with natural gas hydrate pellets, 23rd world gas conference, Amsterdam
3 van der Waals and Platteeuw, J. C., 1959, Clathrate Solutions, Adv. Chem. Phys., Vol. 2, pp. 1-57
4 Sloan, E. D., 1998, Clathrate hydrates of natural gases, Marcel Dekker, inc., New York, pp. 1-318
5 Soave, G., 1972, Equilibrium constants from a modified Redlich-Kwong equation of state, Chem. Eng. Sci., Vol. 27, No. 6, pp. 1197-1203   DOI   ScienceOn
6 Kim, N. J. and Kim, C. B., 2003, Experimental Study on the Structural Characteristics of Gas Hydrates for the Transportation of Natural Gas, Transactions of the KSME B, Vol. 29, No. 2, pp. 251-258
7 Parrish, W. R. and Prausnitz, J. M., 1972, Dissociation Pressure of Gas Hydrates Formed by Gas Mixtures, Ind. Eng. Chem. Process Des. Dev., Vol. 11, pp. 26-34   DOI
8 Huron, M. J. and Vidal, J., 1979, New mixing rules in simple equations of state for representing vapour-liquid equilibria of strongly non-ideal mixtures, Fluid Phase Equilibria, Vol. 3, No. 4, pp. 255-271   DOI   ScienceOn
9 Englezos, P. and Bishnoi, P. R., 1988, Prediction of Gas Hydrate Formation Conditions in Aqueous Electrolyte Solutions, AI ChE Journal, Vol. 34, No. 10, pp. 1718-1721   DOI   ScienceOn
10 Okuda, Y., 1996, Exploration research on gas hydrates in Japan, 5th Petroleum exploration and development symposium, Seoul, pp. 62-98