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Energies 2016, 9(12), 1021; doi:10.3390/en9121021

Gas Hydrate Growth Kinetics: A Parametric Study

Department of Petroleum Engineering, University of Stavanger, 4036 Stavanger, Norway
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Academic Editor: Richard B. Coffin
Received: 11 August 2016 / Revised: 28 October 2016 / Accepted: 28 November 2016 / Published: 5 December 2016
(This article belongs to the Special Issue Methane Hydrate Research and Development)
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Abstract

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. View Full-Text
Keywords: methane hydrate growth kinetics; factors that affect gas hydrate growth rate; reactor scale-up; temperature; stirring rate; water content; mass and heat transfer methane hydrate growth kinetics; factors that affect gas hydrate growth rate; reactor scale-up; temperature; stirring rate; water content; mass and heat transfer
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Meindinyo, R.-E.T.; Svartaas, T.M. Gas Hydrate Growth Kinetics: A Parametric Study. Energies 2016, 9, 1021.

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