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RESEARCH PAPERS

Gas Hydrate Decomposition Rate in Flowing Water

[+] Author and Article Information
Ryokichi Hamaguchi

 Kyushu University, Department of Chemical Engineering, 6-10-1, Hakozaki, Higashi-ku, Fukuoka-shi, Fukuoka, 812-8581 Japanrhama@chem-eng.kyushu-u.ac.jp

Yuki Nishimura, Gen Inoue, Yosuke Matsukuma, Masaki Minemoto

 Kyushu University, Department of Chemical Engineering, 6-10-1, Hakozaki, Higashi-ku, Fukuoka-shi, Fukuoka, 812-8581 Japan

J. Energy Resour. Technol 129(2), 102-106 (Aug 19, 2006) (5 pages) doi:10.1115/1.2718579 History: Received June 07, 2005; Revised August 19, 2006

The development of methane hydrate (MH), which exists under the ocean floor, has recently been brought to public attention. However, the production technology has not yet been established. It is important to understand the decomposition phenomenon of MH for an investigation of the safety and the profitability of production systems. In this research, the gas hydrate decomposition rate in flowing water was measured using HCFC141b hydrate as a substitute for MH. When the water temperature was higher than the boiling point of the decomposition gas, it was observed that the decomposition gas increased the decomposition rate. Moreover, the decomposition phenomenon was simulated by the lattice gas automaton method in order to establish the technique which analytically estimates the decomposition rate. The validity of the simulation method was shown by comparing the experiments. Furthermore, the formula between Reynolds number and Nusselt number was obtained, which express the heat transfer around the gas hydrate lump.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic diagram of the methane hydrate recovery system from the ocean floor by using a gas-lift system

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Figure 2

Equilibrium diagram of methane hydrate and HCFC141b hydrate

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Figure 3

Experimental apparatus of the measuring HCFC141b hydrate decomposition rate

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Figure 4

Photographs of HCFC141b hydrate decomposition

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Figure 5

Variation of HCFC141b hydrate diameter D as a function of elapsed time: (a) Tl=295K; (b) Tl=297K; (c) Tl=308K; (d) Tl=310K

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Figure 7

Schematic of lattice states to describe the decomposition of the methane hydrate wall

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Figure 8

Computational domain of the gas hydrate decomposition model

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Figure 9

Simulation result of gas hydrate decomposition

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Figure 10

Variation of S as a function of iteration number at T′=0.5 and uY′=0.1, 0.3, and 0.5

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Figure 11

Relationship of Reynolds number and Nusselt number: (a) Tl=308, 310, 313K; (b) Tl=295, 297K

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