期刊
FLUID PHASE EQUILIBRIA
卷 338, 期 -, 页码 257-264出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.fluid.2012.10.010
关键词
Gas hydrate; Phase equilibria; Isochoric method; Hydrate dissociation; Step-heating
资金
- Research Institute of Petroleum Industry
The aim of this paper is to investigate the role of thermal path on the accuracy of gas hydrate phase equilibrium data using isochoric method. In this regard, methane hydrate equilibrium conditions have been typically determined using different heating paths - continuous and stepwise. The step-heating path, with proper size and duration of temperature increment, provided the most accurate data of methane hydrate phase equilibrium conditions compared with other experimental data available in literature. We have concluded that equilibrium step-heating path had the potential for determining reliable hydrate phase diagrams, irrespective of the present components in the system. Generally, the sufficient time given to each isothermal step is based on approaching a constant number of moles of gas phase through partial hydrate dissociation whereas the size of temperature increment is limited by the amount of gas encaged in hydrate cages. Moreover, the advantage of isochoric method for pure gas systems in utilizing a section of hydrate phase diagram instead of the distinctive condition, at which the last piece of hydrate disappears, is confirmed. Finally, the possibility of obtaining hydrate phase diagram of pure gas systems at arbitrary pressures was examined by purging the system before hydrate dissociation process. (c) 2012 Elsevier B.V. All rights reserved.
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