Journal of the Korean Solar Energy Society (한국태양에너지학회 논문집)

The Korean Solar Energy Society (한국태양에너지학회)
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Study on Methane Hydrate Formation in Seawater and Pure Water

해수와 순수물에서 메탄 하이드레이트 생성에 대한 연구

  • Park, Sung-Seek (Dept. of Nuclear & Energy Engineering, Cheju National University) ;
  • Kim, Nam-Jin (Dept. of Nuclear & Energy Engineering, Cheju National University)
  • 박성식 (제주대학교 대학원 에너지공학과) ;
  • 김남진 (제주대학교 에너지공학과)
  • Published : 2009.08.30
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Abstract

$1m^3$ hydrate of pure methane can be decomposed to the maximum of $216m^3$ methane at standard condition. If these characteristics of hydrate are reversely utilized, natural gas is fixed into water in the form of hydrate solid. Therefore, the hydrate is considered to be a great way to transport and store natural gas in large quantity. Especially the transportation cost is known to be 18-24% less than the liquefied transportation. In the present investigation, experiments and theoretical calculation carried out for the formation of methane hydrate in NaCl 3.5wt% solution. The results show that the equilibrium pressure in seawater is more higher than that in pure water, and methane hydrate could be formed rapidly during pressurization if the subcooling is maintained at 9K or above in seawater and 8K or above in pure water, respectively. Also, amount of consumed gas volume in pure water is more higher that in seawater at the same experimental conditions. Therefore, it is found that NaCl acts as a inhibitor.

Keywords

References

  1. Hammerschmidt, E. G., Formation of gas hydrates in natural gas transmission Lines,' Int. Eng. Chem., Vol. 26, pp.851-855. 1934 https://doi.org/10.1021/ie50296a010
  2. Kvenvolden, K, A., Methane hydratea Major reservoir of carbon in the shallowgeosphere, Chem. Geol., Vol. 71, pp. 41-51, 1988 https://doi.org/10.1016/0009-2541(88)90104-0
  3. Chang, D G, Kim, N. J, Lee, J Y, and Kim, C. B., Simulation of two phase flow in porous media after dissociation of methane hydrate, Proceeding of the KSME 2000 Fall Annual Meeting, pp. 241-246, 2000
  4. Okuda, Y., Exploration research on gas hydrdtes in Japan,' 5th Petroleum explordtion and development symposiu-m, pp. 62-98, 1996
  5. Gudmundsson, J. S., Andersson, V., and Levik. O. I., Gas storage and transport using hydrates, Offshore Mediterranean Conference, 1997
  6. H. Kanda, Economics study on natural gas transportation with natural gas hydrate pellets, 23rd world gas conference, Amsterdam, 2006
  7. 류병재, 서유택, 강성필, 이흔, 전해질이 메탄 하이드레이트 평형조건과 안정영역에 미치는 영향, 화학공학, Vol. 38, No. 3, pp. 380-386, 2000
  8. H., Ulrich and Englezos, P, Measurment of structure H hydrate phase equilibrium and the effect of electrolytes, Fluid Phase Equilibria Vol. 117, pp. 178 -185, 1996 https://doi.org/10.1016/0378-3812(95)02951-6
  9. Huron, M. J. and Vidal, J., New mixing rules in simple equations of state for representing vapour-liquid equilibria of strongly non-ideal mixtures, Fluid Phase Equilibria, Vo. 3, No.4, pp. 255-271, 1979 https://doi.org/10.1016/0378-3812(79)80001-1
  10. Soave, G., Equilibrium constants from a modified Redlich-Kwong equation of state, Chem. Eng. Sci., Vol. 27, No.6, pp. 1197-1203, 1972 https://doi.org/10.1016/0009-2509(72)80096-4
  11. van der Waals and Platteeuw, J. C., Clathrate Solutions, Adv. Chem. Phys., Vol. 2, pp. 1-57, 1959
  12. Sloan, E. D, Clathrate hydrates of natural gases, Marcel Dekker, inc., New York,pp. 1-318. 1998
  13. Parrish, W. R. and Prausnitz, J M, Dissociation Pressure of Gas Hydrates Formed by Gas Mixtures, Ind. Eng. Chem. Process Des. Dev., Vol. 11, pp. 26-34, 1972 https://doi.org/10.1021/i260041a006
  14. Englezos, P. and Bishnoi, P. R, Pred- iction of Gas Hydrate Formation Conditions in Aqueous Electrolyte Solutions, AIChE Journal, Vol. 34, No. 10, pp. 1718-1721, 1988 https://doi.org/10.1002/aic.690341017