The influence of porosity and structural parameters on different kinds of gas hydrate dissociation

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Abstract

Methane hydrate dissociation at negative temperatures was studied experimentally for different artificial and natural samples, differing by macro-and micro-structural parameters. Four characteristic dissociation types are discussed in the paper. The internal kinetics of artificial granule gas hydrates and clathrate hydrates in coal is dependent on the porosity, defectiveness and gas filtration rate. The density of pores distribution in the crust of formed ice decreases by the several orders of magnitude and this change significantly the rate of decay. Existing models for describing dissociation at negative temperatures do not take into account the structural parameters of samples. The dissociation is regulated by internal physical processes that must be considered in the simulation. Non-isothermal dissociation with constant external heat flux was simulated numerically. The dissociation is simulated with consideration of heat and mass transfer, kinetics of phase transformation and gas filtering through a porous medium of granules for the negative temperatures. It is shown that the gas hydrate dissociation in the presence of mainly microporous structures is fundamentally different from the disintegration of gas hydrates containing meso and macropores.

Original languageEnglish
Article number30324
JournalScientific Reports
Volume6
DOIs
Publication statusPublished - 22 Jul 2016
Externally publishedYes

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Gas hydrates
Porosity
Hydrates
Kinetics
Disintegration
Gases
Density (specific gravity)
Temperature
Ice
Macros
Porous materials
Heat flux
Methane
Mass transfer
Phase transitions
Coal
Heat transfer

ASJC Scopus subject areas

  • General

Cite this

The influence of porosity and structural parameters on different kinds of gas hydrate dissociation. / Misyura, S. Y.

In: Scientific Reports, Vol. 6, 30324, 22.07.2016.

Research output: Contribution to journalArticle

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