Experimental study of methane hydrate formation kinetics with or without additives and modeling based on chemical affinity

Roosta, Hadi; Khosharay, Shahin; Varaminian, Farshad

doi:10.1016/j.enconman.2013.05.024

Cited by 48 publications

(28 citation statements)

References 26 publications

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“…However, findings from an earlier work show that the heat transfer coefficient decreases during the hydrate formation process but remains roughly constant at each growth stage, i.e., there is an equilibration in the heat transfer out of the cell during growth stage II [92]. Other related works have indicated an increase in hydrate formation rate with an increase in stirring rate [40,47,48], and in general stirring has been shown to promote mass transfer [60,64,100,101]. The differences in response to stirring between growth stages II and I may be explained by the following.…”

Section: Effect Of Stirring Rate (Rpm)mentioning

confidence: 92%

Gas Hydrate Growth Kinetics: A Parametric Study

Meindinyo

Svartaas

2016

Energies

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Gas hydrate growth kinetics was studied at a pressure of 90 bars to investigate the effect of temperature, initial water content, stirring rate, and reactor size in stirred semi-batch autoclave reactors. The mixing energy during hydrate growth was estimated by logging the power consumed. The theoretical model by Garcia-Ochoa and Gomez for estimation of the mass transfer parameters in stirred tanks has been used to evaluate the dispersion parameters of the system. The mean bubble size, impeller power input per unit volume, and impeller Reynold's number/tip velocity were used for analyzing observed trends from the gas hydrate growth data. The growth behavior was analyzed based on the gas consumption and the growth rate per unit initial water content. The results showed that the growth rate strongly depended on the flow pattern in the cell, the gas-liquid mass transfer characteristics, and the mixing efficiency from stirring. Scale-up effects indicate that maintaining the growth rate per unit volume of reactants upon scale-up with geometric similarity does not depend only on gas dispersion in the liquid phase but may rather be a function of the specific thermal conductance, and heat and mass transfer limitations created by the limit to the degree of the liquid phase dispersion is batched and semi-batched stirred tank reactors.

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Section: Effect Of Stirring Rate (Rpm)mentioning

confidence: 92%

Gas Hydrate Growth Kinetics: A Parametric Study

Meindinyo

Svartaas

2016

Energies

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“…Water adsorbs on metal atoms or clusters to form OH groups, which block the interaction between methane and active sites. Some researchers [25][26][27][28] have used in situ DR-FTIR spectra to investigate the formation and accumulation of hydroxyl groups on Pd clusters. Several well-resolved OH absorption bands that represent bridged or terminal OH groups have been identified.…”

Section: Introductionmentioning

confidence: 99%

Methane oxidation with low O2/CH4 ratios in the present of water: Combustion or reforming

Geng

Yang

Zhang

et al. 2017

Energy Conversion and Management

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“…So, it is applicable for systems with complex additives like crude oil. For a chemical reaction, the chemical affinity (A i ) is a generalized driving force which is given by the following expression suggested by Roosta et al (2013): …”

Section: Chemical Affinity Modeling For Kinetics Of Hydrate Formationmentioning

confidence: 99%

“…The chemical affinity model (Roosta et al 2013) is one of the thermodynamic-based approaches that can be applied for hydrate formation kinetics. This model is independent of the parameters such as heat and mass transfer coefficients which are difficult to determine and only macroscopic properties such as pressure and temperature are needed for this model.…”

Section: Chemical Affinity Modeling For Kinetics Of Hydrate Formationmentioning

confidence: 99%

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Experimental and modeling study of kinetics for methane hydrate formation in a crude oil-in-water emulsion

et al. 2016

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A low-viscosity emulsion of crude oil in water can be believed to be the bulk of a flow regime in a pipeline. To differentiate which crude oil would and which would not counter the blockage of flow due to gas hydrate formation in flow channels, varying amount of crude oil in water emulsion without any other extraneous additives has undergone methane gas hydrate formation in an autoclave cell. Crude oil was able to thermodynamically inhibit the gas hydrate formation as observed from its hydrate stability zone. The normalized rate of hydrate formation in the emulsion has been calculated from an illustrative chemical affinity model, which showed a decrease in the methane consumption (decreased normalized rate constant) with an increase in the oil content in the emulsion. Fourier transform infrared spectroscopy (FTIR) of the emulsion and characteristic properties of the crude oil have been used to find the chemical component that could be pivotal in selfinhibitory characteristic of the crude oil collected from Ankleshwar, India, against a situation of clogged flow due to formation of gas hydrate and establish flow assurance.

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Experimental study of methane hydrate formation kinetics with or without additives and modeling based on chemical affinity

Cited by 48 publications

References 26 publications

Gas Hydrate Growth Kinetics: A Parametric Study

Gas Hydrate Growth Kinetics: A Parametric Study

Methane oxidation with low O2/CH4 ratios in the present of water: Combustion or reforming

Experimental and modeling study of kinetics for methane hydrate formation in a crude oil-in-water emulsion

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