Methane Hydrate Formation and Thermal Based Dissociation Behavior in Silica Glass Bead Porous Media

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• 作者：Garrett C. Fitzgerald ; Marco J. Castaldi ; Judith M. Schicks
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：April 23, 2014
• 年：2014
• 卷：53
• 期：16
• 页码：6840-6854
• 全文大小：916K
• 年卷期：v.53,no.16(April 23, 2014)
• ISSN：1520-5045

文摘

Formation and thermal based dissociation of methane pore space hydrate has been studied at various initial hydrate saturations and heating rates utilizing a 1.3 cm³ glass bead sample pack. Initial hydrate formation occurred rapidly after pressurization and proceeded at a higher rate for systems with the lower initial water saturation. Peak initial formation rates for 21%, 41%, and 60% initial water saturation was 4.3 脳 10^鈥?, 1.44 脳 10^鈥?, and 1.7 脳 10^鈥? mol/s, respectively. Three distinct stages of formation were observed for hydrate growth in porous media; a rapid initial formation regime determined by the enclathration reaction followed by a slow mass limited diffusion regime again followed by a second rapid and discrete formation period. Peak efficiency rates ranged from 74% to 81%. Experimental and numerical results showed slightly higher efficiency rates and maximum cumulative efficiency values for lower heating rate conditions. Lower heating rates produce a higher cumulative efficiency at the trade-off of less total hydrate being dissociated. Cumulative production efficiencies were greater for conditions of higher initial hydrate saturation, with values at 62% for 18% hydrate saturation and 72% for 50% hydrate saturation.