均相多孔介質中運用二氧化碳置換法開採甲烷水合物的中尺度數值模擬研究

謝佩穎

doi:10.6840/cycu201900820

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均相多孔介質中運用二氧化碳置換法開採甲烷水合物的中尺度數值模擬研究

Mesoscale Numerical Simulation of exploiting Methane Hydrate by Carbon Dioxide Replacement in Homogeneous Porous Media

謝佩穎 , Masters　　Advisor：施武陽　　

英文 DOI： 10.6840/cycu201900820

天然氣水合物分解；二氧化碳置換；計算流體力學；均相多孔介質； gas hydrate dissociation ； carbon dioxide replacement ； computational fluid dynamics ； homogeneous porous media

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With the development of the economy, global warming is becoming more and more serious, traditional fossil energy will be exhausted, and the energy policies of various are beginning to lead to low-carbon energy development. Due to the huge content of natural gas hydrates in the world, research on natural gas hydrate mining has attracted much attention. In recent years, the greenhouse effect has become more and more serious. How to reduce carbon dioxide emissions has made the greenhouse effect gradually become a global issue. Therefore, scientists have proposed that carbon dioxide can be used to replace methane hydrate, and not only new energy can be obtained in the replacement process, but also carbon dioxide can be stored in the deep ocean in the form of a hydrate.
In this study, methane hydrate dissociation and CO2 hydrate formation models were established under different methane and carbon dioxide hydrate equilibrium regions. Using the dynamic mesoscale model established by the three-dimensional unstructured mesh of CFD technology, to present high-precision simulation of sediment dynamics by Representative elementary volume(REV) method. The finite volume method is used to establish an unstructured grid system, and the process of CO2 replacement of methane hydrate under water flow conditions was studied, and applying the VTL (Very Thin Layer) method to calculate the hydrate surface momentum, concentration, and thermal boundary layer thickness. Under the temperature and pressure of different boundary conditions, the dynamic simulation of CO2 was used to replace the homogeneous porous medium methane hydrate, and the rate of methane hydrate dissociation and CO2 formation and temperature change were estimated. 
Through this study, it can be seen that when the methane hydrate replaces in the stable or unstable region, the concentration and temperature of methane hydrate dissociation and CO2 hydrate formation change dynamically, and understand the changes in the replacement process over time in the ideal hypothetical situation.

Reference ( 35 ) 〈TOP〉

Agency, I.E., 2018. World Energy Outlook 2018.
Anderson, G.K., 2003. Enthalpy of dissociation and hydration number of carbon dioxide hydrate from the Clapeyron equation. The Journal of Chemical Thermodynamics 35, 1171-1183.
Aregbe, A.G., 2017. Gas hydrate-properties, formation and benefits. Open J. Yangtze. Oil. Gas 2, 27-44.
Chen, L., Feng, Y., Okajima, J., Komiya, A., Maruyama, S., 2018. Production behavior and numerical analysis for 2017 methane hydrate extraction test of Shenhu, South China Sea. Journal of Natural Gas Science and Engineering 53, 55-66.
Chen, Y., 2018. Dynamic Behavior Study on the Recovery of Methane Hydrate with Combined Methods. National Taiwan University of Science and Technology, Chemical Engineering.

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