Insight into the micro-mechanism of hydrate-based methane storage from active ice

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NETL
NSTL
Elsevier

外文摘要：© 2024 Elsevier LtdGas hydrate formation in active ice holds significant potential for solidified natural gas storage, while the deep understanding of its micro-mechanism is required for the futural application of such a technology. In this study, the kinetics and micro-properties of methane hydrate formation enhanced by active ice (porous ice containing an unfrozen solution layer of sodium dodecyl sulfate) were investigated via experiments and molecular dynamics (MD) simulations. Raman spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray diffraction (XRD) differential scanning calorimetry (DSC) characterization, and in-situ visual observation confirmed the formation of sI methane hydrate in the active ice system and the occurrence of single-crystal hydrate, and also indicated the occurrence of active water near the surface of porous active ice during the active ice formation. A sensitivity analysis of the hydrate kinetics experiments suggested that temperature is the primary driver of rapid methane hydrate formation in the active ice system. The shortest induction time and t90 for hydrate formation were recorded at 5 s and 5.5 min, respectively. Furthermore, MD simulations indicated that the direct hydrate nucleation and growth in the active water, heat transfer from gas hydrate to ice, and the diffusion of active water (1.24 × 10-9 m2/s) and methane (7.10 × 10-8 m2/s) into the porous ice structure are the primary mechanism that enhances hydrate formation kinetics and methane storage capacity. This work provides an essential microscopic mechanism of the “active ice → active water → gas hydrate” circulation that contributes to the deep understanding and futural application of the efficient hydrate-based solidified methane storage in active ice system.

外文关键词：

Active iceActive waterGas hydrateMolecular dynamics simulationSolidified methane storage

作者：

Duan J.、Zhong K.、Jiang S.、Chen D.、Zi M.、Chen G.

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作者单位：

Institute for Ocean Engineering Shenzhen International Graduate School Tsinghua University

Institute for Ocean Engineering Shenzhen International Graduate School Tsinghua UniversityInstitute for Ocean Engineering Shenzhen International Graduate School Tsinghua University||Shenzhen Key Laboratory of Advanced Technology for Marine Ecology Shenzhen International Graduate School Tsinghua University||

State Key Laboratory of Heavy Oil Processing China University of Petroleum

出版年：

2025

DOI：

10.1016/j.fuel.2024.133154

Fuel: A journal of fuel science

ISSN：0016-2361

年,卷(期)：2025.381(Pt.1)

参考文献量45