Hydrate formation under static and pulsed electric fields

Pahlavanzadeh, Hassan; Hejazi, Sima; Manteghian, Mehrdad

doi:10.1016/j.jngse.2020.103232

Cited by 18 publications

(4 citation statements)

References 37 publications

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“…A structure transformation of the hydrate lattice to a less H-bonded configuration was clearly indicated when an electric field is applied, which is accompanied by the release of guest species from the hydrates. On the other hand, under a weak or moderate electric field, previous experimental results demonstrate that the external electric field can play a significant role in the kinetics of hydrate formation. − Chen et al reported that a weak electric field could affect the induction time and growth rate of tetrahydrofuran (THF) hydrate by controlling the voltage across the two electrodes placed on the two sides of the reactor. Moreover, gas hydrate nucleation can be significantly promoted with the induction time reduced by 5.8 times under an electric field of 10 4 V/m, accompanied by the rearrangements of water molecules …”

Section: Resultsmentioning

confidence: 99%

Electric Field-Controlled Structural Instability and Mechanical Properties of Methane Hydrates

Cao

Sheng

Sveinsson

et al. 2022

Crystal Growth & Design

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Gas hydrates play a significant role in the broad areas of energy applications and climate changes. Furthermore, externally applied fields by charged sediments and artificial activities are of paramount importance for transitions between disordered and ordered gas hydrate systems on the Earth. Herein, the role of external static electric fields in the structural instability and mechanical properties of methane hydrates are explored using molecular dynamics simulation methods. Our simulation results show that mechanical characteristics of methane hydrates such as Young's modulus, strengths, and failure modes are greatly affected by strengths and imposed directions of external electric fields. Interestingly, strong electric fields can result in the distortion and dissociation of local water cages in methane hydrates mainly due to realignments of water molecules, thereby weakening their mechanical properties. Moreover, instability failure modes of methane hydrates can be attributed to notable reorientations of water molecules and molecular diffusions of water and methane molecules in methane hydrates. This work provides new insights into mechanics of natural crystalline gas hydrates, which is also helpful for understanding the mechanical instability of charged sediment−host natural gas hydrates.

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Section: Resultsmentioning

confidence: 99%

Electric Field-Controlled Structural Instability and Mechanical Properties of Methane Hydrates

Cao

Sheng

Sveinsson

et al. 2022

Crystal Growth & Design

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“…The traditional hydration enhancement methods can be categorized into physical and chemical methods. The physical methods mainly include spraying (Zhao et al, 2015), mechanical stirring (Meleshkin and Marasanov, 2021), bubbling (Cai et al, 2017), external magnetic field (English and Allen, 2019), electric field (Pahlavanzadeh et al, 2020), ultrasonic field (Park and Kim, 2013), and other methods. The chemical methods mainly encompass the addition of kinetic enhancers such as sodium dodecyl sulfate (SDS) (Zhang et al, 2023) and amino acids (Gaikwad et al, 2021;Yodpetch et al, 2023).…”

Section: Introductionmentioning

confidence: 99%

Influence of micro-particles on gas hydrate formation kinetics: Potential application to methane storage and transportation

Wu,

Tang,

Zhao

et al. 2023

Adv. Geo-Energy Res.

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Methane hydration is a safe, stable and environmentally friendly technology to bind and utilize excess coalbed methane gas. However, a limiting factor of the commercial application of coalbed methane hydration technology is the sluggish hydration reaction kinetics of methane hydrate formation, which needs to be improved. In this work, different micro-particle suspensions are prepared from an initial solution containing gellan gum and L-tryptophan, along with varying mass fractions of NiMnGa, Cu and carboxylated multi-walled carbon nanotubes, and their influence on the reaction kinetics in methane hydrate formation is examined. The results show that the formation of methane hydrate is enhanced by these micro-particles to varying degrees. Micro-particles show a synergistic solubilization effect with L-tryptophan and gellan gum at 6.2 MPa. The induction times of 1 wt.% NiMnGa system and 1 wt.% Cu system are the shortest. The 2 wt.% NiMnGa system has a pronounced impact on methane gas consumption, and the average gas consumption rates of the 0.1 wt.% Cu system and 1 wt.% NiMnGa system are faster. However, as the concentration of Cu micro-particles increases, both gas consumption and the average generation rate exhibits a linear decrease. This work offers valuable recommendations for choosing the experimental settings, micro-particle types and concentrations. We also lay the groundwork for the practical and sustainable application of coalbed methane storage and transportation technology employing the hydrate approach.

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“…Overall, they concluded that using an electric field can enhance ice nucleation significantly. Pahlavanzadeh et al 30 experimentally studied the effect of a static electric field and a pulsed electric field on tetrahydrofuran hydrate nucleation temperature and growth time. It was observed that the static electric field could increase the nucleation temperature and growth time.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Investigation of the Effect of Electric Field on Solid–Liquid Equilibrium

2021

Self Cite

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In this study, the thermal, mechanical, and chemical equilibrium conditions are derived for binary solid–liquid equilibrium under the effect of an electric field. As an example, the effect of an electric field on the water/glycerol solid–liquid phase diagram is computed over the complete mole fraction range. We show that the application of an electric field can affect the composition dependent freezing and precipitating processes, changing freezing and precipitating temperatures and changing the eutectic point temperature and mole fraction.

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Hydrate formation under static and pulsed electric fields

Cited by 18 publications

References 37 publications

Electric Field-Controlled Structural Instability and Mechanical Properties of Methane Hydrates

Electric Field-Controlled Structural Instability and Mechanical Properties of Methane Hydrates

Influence of micro-particles on gas hydrate formation kinetics: Potential application to methane storage and transportation

Thermodynamic Investigation of the Effect of Electric Field on Solid–Liquid Equilibrium

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