Memory effect test and analysis in methane hydrates reformation process

Lingli Shi, Junhui Li, Yong He, Jingsheng Lu, Zhen Long and Deqing Liang

Energy, 2023, vol. 272, issue C

Abstract: Memory effect could significantly fasten hydrate nucleation rate and increase the efficiency of hydrate-based industrial applications. To examine the strength and understand the mechanism of memory effect under different conditions, methane hydrate reformation experiments were carried out. The experiments were designed with four different initial pressures and three different gas-water ratios. The calculated parameters including induction time and hydrate formation rate were analyzed to evaluate the memory effect and understand its mechanism. The results showed that when initial pressure was higher than 8.0 MPa the induction time values were similar in repeated experimental runs, demonstrating that the memory effect was not strengthened with increase of repeated times. Meanwhile the induction time values did vary with different initial pressures and gas-water ratios, revealing that the two factors of pressure or gas-water ratio played as a dominant actor differently in systems with different initial pressures. Besides, a mechanism of memory effect was proposed. We argue that residual water lattice or super-saturated gas nano-bubbles performed as a dominant role in systems with relatively high or low initial pressure, respectively.

Keywords: Memory effect; Methane hydrate; Induction time (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:272:y:2023:i:c:s0360544223005479

DOI: 10.1016/j.energy.2023.127153

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