Experimental Analysis on the Probability Density Distribution of Methane Hydrate Induction Times in Porous Media. Issue 13 (6th April 2018)

• Record Type: Journal Article
• Authors: Wang, Shanrong; Yang, Mingjun; Li, Kehan
• Is Part Of: ChemistrySelect. Volume 3:Issue 13(2018)
• Page Start: 3781
• Page End: 3786
• Publication Date: 2018-04-06
• Subjects: gas hydrate -- hydrate formation -- induction time -- lognormal distribution; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.201800154
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: Hydrate‐based natural‐gas transport and storage have been proposed and developed because of the high safety and low cost, and hydrate reformation is a serious barrier for high‐efficiency natural‐gas hydrate exploitation. The hydrate formation induction time is a crucial kinetic parameter for both of the two fields. To clarify the hydrate formation and/or reformation induction characteristics, the effects of sub‐cooling, particle size, initial water saturation and memory effect on the stochastic induction time patterns are experimentally investigated. In total, 22 cases were performed, and each case was repeated in 20–30 runs under identical conditions. The experimental results show that the distribution of CH4 hydrate induction times can be properly fitted to a lognormal distribution function. Larger sub‐cooling leads to shorter induction time and more repeatable experimental results. It is also found that shorter induction time and repeatable results can be obtained with bigger particle size. The experimental results show that 70% water saturation can be considered a critical value for hydrate formation. Memory effect of water is existed in the experiments, which can help reducing the induction time and its stochastic nature. It can be considered that the memory effect on the induction time is dominant compared with the other factors (sub‐cooling, particle size and initial water saturation). Abstract : Hydrate nucleation is a stochastic process which tends to give a sudden, catastrophic appearance of the hydrate phase, thus making detailed experimental studies and measurements very difficult. And nucleation is a heterogeneous process that depends on surfaces, impurities and other external factors such the volume of the aqueous solution. One parameter that has been used consistently to study hydrate nucleation is the macroscopic induction time.