2008-03-012024-05-15https://scholars.lib.ntu.edu.tw/handle/123456789/665169摘要：天然氣水合物是一項新型態的天然氣資源，第28屆國際地質大會提供的資料顯示，全球海底所蘊藏之天然氣水合物，足夠供應人類一千年能源需求。因此包括美國、加拿大、印度、日本、韓國及中國大陸都投入大量資金進行研究，評估商業開採及利用的可行性。台灣自民國93年開始，在經濟部中央地質調查所的推動下，目前已完成西南海域天然氣水合物的的賦存潛力與分布範圍調查，證實該區域普遍有天然氣水合物的賦存。然而為進行天然氣水合物的開採以及後續儲存及運送，皆必須先得知天然氣水合物系統的熱力學性質。有鑑於此，本計畫之目的在於結合實驗、理論模型及分子模擬等方法，從不同層面研究天然氣水合物之熱力學性質。我們將建構國內第一套可視性低溫高壓設備，量測天然氣水合物在不同系統環境下的生成與融解情形。搭配分子模擬的進行，我們可以進一步瞭解天然氣水合物之形成與分解的動力學機制，並藉此尋找提升其熱穩定度之方法。實驗結果亦將用來建立高度精確的理論模型(狀態方程式)，提供西南海域天然氣水合物探採、開發與儲運等模擬分析或工程設計上的參考依據，並探討二氧化碳水合物封存及利用二氧化碳置換水合物中甲烷之可行性。<br> Abstract: Gas hydrage is a new resource for natural gas. In the 28th International Geological Congress, it was shown that the total amount of methane stored in the form of gas hydrate in oceanic sediments, if recovered, could supply the human energy demand for 1000 years. As a consequence, many countries, including the U.S., Candana, India, Japan, South Korea, and China, have invested in the gas hydrate research for possible recovery and commercial use of methane hydrate in the near future. Since year 2004 Taiwan also started identifying and quantifying the occurrences methance hydrate in the Southwestern sea of Taiwan. However, for methane hydrate recovery and the subsequent storage and transportation, it is necessary to have a good understanding of the thermodynamic properties of gas hydrate. In this project, we propose to study the thermodynamic properties of gas hydrate via experiment, theoretical modeling, and molecular simulations. We will establish a visible cell for high-pressure and low temperature experiments of gas hydrate formation and dissociation. Together with molecular dynamic simulations, we will be able to better understand the mechanism of the melting process and provide possible additive candidate for enhancing its thermal stability. We will also develop a highly accurate equation of state to model experimental results. The equation of state can be used in the design and optimization of processes for the recovery, storage, and transportation of methane hydrate. It can also be used to study carbon dioxide sequestration in the form of CO2 hydrate and possible replacement of methane hydrate with CO2 hydrate.天然氣水合物熱力學分子模擬狀態方程式液固相平衡gas hydratethermodynamicsmolecular simulationequation of statesolid-liquid equilibria