scholarly journals Axisymmetric hydrate monolith destruction problem

2021 ◽  
Vol 2094 (2) ◽  
pp. 022014
Author(s):  
M V Stolpovsky ◽  
A S Chiglintseva ◽  
M R Davletshina
Keyword(s):  
Mathematical Model ◽  
Gas Hydrate ◽  
Cylindrical Cavity ◽  
Methane Hydrate ◽  
Initial Temperature ◽  
Conservation Of Mass ◽  
Hydrate Decomposition ◽  
Temperature Distributions

Abstract A mathematical model is proposed for the destruction of a methane hydrate monolith containing gas inclusions. In this formulation of the problem, it is assumed that there is a cylindrical cavity inside the hydrate monolith, initially filled only with methane. Since the conditions on the surface of the particle correspond to the conditions for the free existence of gas and water, the gas hydrate begins to decompose. On the basis of the obtained system, consisting of the equations of conservation of mass and heat, the temperature distributions in the “cavity - gas hydrate” system were obtained, and the influence of the initial temperature of the system and the temperature in the cavity on the dynamics of hydrate decomposition was analyzed.

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.

SS - Gas Hydrate: Gas production from methane hydrate sediment layer by thermal stimulation with hot water injection

2010 ◽  
Author(s):  
Kyuro Sasaki ◽  
Shinzi Ono ◽  
Yuichi Sugai ◽  
Norio Tenma ◽  
Takao Ebinuma ◽  
...  
Keyword(s):  
Gas Hydrate ◽  
Methane Hydrate ◽  
Water Injection ◽  
Gas Production ◽  
Hot Water ◽  
Thermal Stimulation ◽  
Sediment Layer

Influence of a Combined Low Dosage Gas Hydrate Inhibitor on Methane Hydrate Surface

2014 ◽  
Vol 1008-1009 ◽  
pp. 300-306
Author(s):  
Cui Ping Tang ◽  
Dong Liang Li ◽  
De Qing Liang
Keyword(s):  
Molecular Dynamics ◽  
Hydrogen Bond ◽  
Hydrogen Bonds ◽  
Gas Hydrate ◽  
Methane Hydrate ◽  
Md Simulation ◽  
Side Group ◽  
Large Space ◽  
Surface Molecules ◽  
Low Dosage

According to analysis of the gas hydrate cage and structure of the inhibitor and simulation of molecular dynamics, the interaction between GHI1 and hydrates was discussed. The structure analysis indicated the side group of PVP can insert into the open hydrate cage, and force the hydrate growing along the polymer chain, which results in a large space resistance and inhibits gas hydrate agglomerating. The results of MD simulation show GHI1 can damage the surface cage in hydrate lattice; the hydrogen and oxygen in GHI1 can form hydrogen bonds respectively with oxygen and hydrogen in hydrates, which makes the surface molecules of the cages unstable and distorts the cages; Synergist diethylene glycol ether increases strength and range of length of hydrogen bond.

Temperature Prediction Model for Molten Steel in RH Refining Process

2013 ◽  
Vol 712-715 ◽  
pp. 22-25 ◽  
Author(s):  
Tia Xia ◽  
Zhu He
Keyword(s):  
Mathematical Model ◽  
Prediction Model ◽  
Molten Steel ◽  
Initial Temperature ◽  
Refining Process ◽  
Temperature Prediction ◽  
Steel Temperature ◽  
Molten Steel Temperature

A mathematical model for the RH refining process was developed and validated by the measured molten steel temperature in situ. It is showed that the model predicted temperature matched the measured value well and the average errors within ±5°C were 86.9%. The model results also showed that for every increase of 100°C of the initial temperature of the chamber inwall , the average molten steel temperature increased by about 8°C. For every blowing extra 50m3 oxygen, the steel temperature increased by about 7°C.

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