不同驱动力下瓦斯水合物生长过程Raman光谱特征

doi:10.3964/j.issn.1000-0593(2017)09-2768-06

Abstract
References
Related Citation (15)

Download: PDF (4599 KB)
Export: BibTeX | EndNote (RIS)

Abstract Based on the phase equilibrium line of coal mine gas (CH₄∶C₂H₆∶N₂=67.5∶22.5∶10) hydrate, hydration kinetics experiments with four different driving forces were worked out. The hydrate growth spectra were obtained by using micro-Raman spectroscopy. The hydrates in four experiments were sⅡ type according to the Raman shift of C₂H₆ C—C bond stretching vibration. The change laws of gas hydrate phase compositions and hydration numbers were obtained based on the model of van der Waals and Platteeuw. The results showed that the stability of hydrate was affected by driving force. When the driving force increased, the CH₄ occupied more cavities than C₂H₆, and the more proportion of CH₄ in hydrate phase, was the more stable the hydrate became. The priority levels entering hydrate cavities of N₂, CH₄ and C₂H₆ could be determined by using the diameter ratio of object molecular and hydrate cavities. Among these objects, the priority level of CH₄ was the highest for small cavities and C₂H₆ was the highest for large cavities. The description of the guest material transfer law of hydrate growth process based on gas hydrate stability provides a theoretical basis for gas hydrate micro-growth.

Key words：Gas hydrate; Raman spectra; Growth process; Material transfer

Received: 2015-04-24 Accepted: 2015-09-16

ZTFLH:

TD712

Cite this article:

URL:

https://www.gpxygpfx.com/EN/10.3964/j.issn.1000-0593(2017)09-2768-06 OR https://www.gpxygpfx.com/EN/Y2017/V37/I09/2768