Visualization of methane hydrate decomposition interface and analyses of decomposition rate and interfacial configuration

2020 ◽  
Vol 32 (4) ◽  
pp. 047105
Author(s):  
Yuki Kanda ◽  
Junnosuke Okajima ◽  
Shigenao Maruyama ◽  
Atsuki Komiya
Keyword(s):  
Decomposition Rate ◽  
Methane Hydrate ◽  
Hydrate Decomposition

scholarly journals Optimization of Methane Hydrate Recovery System from Ocean Floor (Basic Study on Hydrate Decomposition Rate)

2006 ◽  
Vol 72 (716) ◽  
pp. 901-907
Author(s):  
Ryokichi HAMAGUCHI ◽  
Hiroki YAHASHI ◽  
Yosuke MATSUKUMA ◽  
Gen INOUE ◽  
Masaki MINEMOTO ◽  
...  
Keyword(s):  
Decomposition Rate ◽  
Methane Hydrate ◽  
Ocean Floor ◽  
Basic Study ◽  
Hydrate Decomposition ◽  
Recovery System

Gas Hydrate Decomposition Rate in Flowing Water

2006 ◽  
Vol 129 (2) ◽  
pp. 102-106 ◽  
Author(s):  
Ryokichi Hamaguchi ◽  
Yuki Nishimura ◽  
Gen Inoue ◽  
Yosuke Matsukuma ◽  
Masaki Minemoto
Keyword(s):  
Heat Transfer ◽  
Gas Hydrate ◽  
Decomposition Rate ◽  
Methane Hydrate ◽  
Lattice Gas ◽  
Production Systems ◽  
Simulation Method ◽  
Flowing Water ◽  
Public Attention ◽  
Hydrate Decomposition

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.

Molecular simulation of non-equilibrium methane hydrate decomposition process

2012 ◽  
Vol 44 (1) ◽  
pp. 13-19 ◽  
Author(s):  
S.Alireza Bagherzadeh ◽  
Peter Englezos ◽  
Saman Alavi ◽  
John A. Ripmeester
Keyword(s):  
Molecular Simulation ◽  
Methane Hydrate ◽  
Decomposition Process ◽  
Hydrate Decomposition ◽  
Non Equilibrium

Experimental Investigation into Methane Hydrate Decomposition during Three-Dimensional Thermal Huff and Puff

2011 ◽  
Vol 25 (4) ◽  
pp. 1650-1658 ◽  
Author(s):  
Xiao-Sen Li ◽  
Yi Wang ◽  
Gang Li ◽  
Yu Zhang ◽  
Zhao-Yang Chen
Keyword(s):  
Experimental Investigation ◽  
Methane Hydrate ◽  
Three Dimensional ◽  
Hydrate Decomposition

A new methane hydrate decomposition model considering intrinsic kinetics and mass transfer

2019 ◽  
Vol 361 ◽  
pp. 1264-1284 ◽  
Author(s):  
Shangfei Song ◽  
Bohui Shi ◽  
Weichao Yu ◽  
Lin Ding ◽  
Yuchuan Chen ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Methane Hydrate ◽  
Hydrate Decomposition ◽  
Decomposition Model ◽  
Intrinsic Kinetics

scholarly journals Observation of Pseudo Plume Behavior by Hydrate Sedimentary Layer Decomposition

2021 ◽  
Vol 333 ◽  
pp. 02007
Author(s):  
Yusuke Takahashi ◽  
Ryosuke Ezure ◽  
Shun Takano ◽  
Hiroyuki Komatsu ◽  
Kazuaki Yamagiwa ◽  
...  
Keyword(s):  
Stokes Equation ◽  
Methane Hydrate ◽  
Energy Resource ◽  
Hydrate Formation ◽  
Navier Stokes ◽  
Navier Stokes Equation ◽  
Hydrate Decomposition ◽  
Hydrate Film ◽  
Spherical Bubbles ◽  
Sedimentary Layer

We are focusing on the practical use of methane hydrate. For recovery and use of it as an energy resource, it is necessary to consider the possibility of clogging in the recovery pipe due to the rehydration of bubbles. The purpose of this research was to observe experimentally and evaluate theoretically the decomposition behavior of hydrate sedimentary layer and the rising behavior of bubbles generated by hydrate decomposition. Chlorodifluoromethane was used as a low pressure model gas of methane. Hydrate sedimentary layer was produced by cooling and pressurizing water in countercurrent contact with gas using a hydrate formation recovery device. The recovered hydrate was decomposed by the heating or depressurization method, without flowing water. Two theoretical rising velocities were derived from the theoretical value with using the Navier-Stokes equation or the values in consideration of the bubble shape and hydrate film existence. The experimental rising velocities of small spherical bubbles radius agreed well with the theoretical value by the Navier-Stokes equation. The relatively large elliptical bubbles showed a behavior close to the theoretical value of bubble with hydrate film. Under the pressure and temperature conditions closer to the hydrate equilibrium line, almost no generated bubbles could be identified visually.

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