The features of self-preservation for hydrate systems with methane

V. E. Nakoryakov, S. Ya Misyura

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

Dissociation of hydrate systems is studied experimentally: gas hydrate of methane produced artificially in the reactor-crystallizer; natural gas hydrates of methane; water-methane-isopropanol systems in the air atmosphere. Artificial gas hydrate of methane and natural hydrates demonstrate the ranges of abnormally low dissociation rate. At that the boundaries of the temperature windows of self-preservation differ significantly for natural and artificial hydrate systems. Despite the similar structures of elementary hydrate cells of natural and artificial gas hydrates, the dissociation rate of natural samples was significantly lower than the dissociation rate of artificial powders. Moreover, natural hydrates had the expanded time period of the stable thermodynamic state. The mechanism of gas hydrate dissociations depends not only on the driving forces and structural characteristics, but also on the average initial diameter of the powder particles. The creep properties of gas hydrates and limits of their strength are associated with microstructural characteristics, and the dissociation rate depends on the size of the grains. The temperature fields of separate granule surface were obtained via many-times magnification of thermal images. Temperature distribution over the surface is significantly non-uniform, and this characterizes non-uniform hydrate dissociation within the granule volume. Dissociation kinetics for the natural and artificial samples was studied at different heat fluxes. The maximal heat flux and maximal dissociation rate were achieved at combustion of methane hydrate. Both instantaneous and average dissociation rates were measured.

Original languageEnglish
Pages (from-to)1-9
Number of pages9
JournalChemical Engineering Science
Volume104
DOIs
Publication statusPublished - 18 Dec 2013
Externally publishedYes

Fingerprint

Methane
Hydrates
Preservation
Gas Hydrate
Gas hydrates
Heat Flux
Powder
Powders
Heat flux
Temperature distribution
Crystallizers
Natural Gas
2-Propanol
Creep
Driving Force
Temperature Distribution
Temperature Field
Period of time
Combustion
Reactor

Keywords

  • Creep
  • Hydrate combustion
  • Hydrate dissociation
  • Pores
  • Self-preservation

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering
  • Applied Mathematics

Cite this

The features of self-preservation for hydrate systems with methane. / Nakoryakov, V. E.; Misyura, S. Ya.

In: Chemical Engineering Science, Vol. 104, 18.12.2013, p. 1-9.

Research output: Contribution to journalArticle

@article{7e5d8097cc6e43eba7072ea7e55f5f80,
title = "The features of self-preservation for hydrate systems with methane",
abstract = "Dissociation of hydrate systems is studied experimentally: gas hydrate of methane produced artificially in the reactor-crystallizer; natural gas hydrates of methane; water-methane-isopropanol systems in the air atmosphere. Artificial gas hydrate of methane and natural hydrates demonstrate the ranges of abnormally low dissociation rate. At that the boundaries of the temperature windows of self-preservation differ significantly for natural and artificial hydrate systems. Despite the similar structures of elementary hydrate cells of natural and artificial gas hydrates, the dissociation rate of natural samples was significantly lower than the dissociation rate of artificial powders. Moreover, natural hydrates had the expanded time period of the stable thermodynamic state. The mechanism of gas hydrate dissociations depends not only on the driving forces and structural characteristics, but also on the average initial diameter of the powder particles. The creep properties of gas hydrates and limits of their strength are associated with microstructural characteristics, and the dissociation rate depends on the size of the grains. The temperature fields of separate granule surface were obtained via many-times magnification of thermal images. Temperature distribution over the surface is significantly non-uniform, and this characterizes non-uniform hydrate dissociation within the granule volume. Dissociation kinetics for the natural and artificial samples was studied at different heat fluxes. The maximal heat flux and maximal dissociation rate were achieved at combustion of methane hydrate. Both instantaneous and average dissociation rates were measured.",
keywords = "Creep, Hydrate combustion, Hydrate dissociation, Pores, Self-preservation",
author = "Nakoryakov, {V. E.} and Misyura, {S. Ya}",
year = "2013",
month = "12",
day = "18",
doi = "10.1016/j.ces.2013.08.049",
language = "English",
volume = "104",
pages = "1--9",
journal = "Chemical Engineering Science",
issn = "0009-2509",
publisher = "Elsevier BV",

}

TY - JOUR

T1 - The features of self-preservation for hydrate systems with methane

AU - Nakoryakov, V. E.

AU - Misyura, S. Ya

PY - 2013/12/18

Y1 - 2013/12/18

N2 - Dissociation of hydrate systems is studied experimentally: gas hydrate of methane produced artificially in the reactor-crystallizer; natural gas hydrates of methane; water-methane-isopropanol systems in the air atmosphere. Artificial gas hydrate of methane and natural hydrates demonstrate the ranges of abnormally low dissociation rate. At that the boundaries of the temperature windows of self-preservation differ significantly for natural and artificial hydrate systems. Despite the similar structures of elementary hydrate cells of natural and artificial gas hydrates, the dissociation rate of natural samples was significantly lower than the dissociation rate of artificial powders. Moreover, natural hydrates had the expanded time period of the stable thermodynamic state. The mechanism of gas hydrate dissociations depends not only on the driving forces and structural characteristics, but also on the average initial diameter of the powder particles. The creep properties of gas hydrates and limits of their strength are associated with microstructural characteristics, and the dissociation rate depends on the size of the grains. The temperature fields of separate granule surface were obtained via many-times magnification of thermal images. Temperature distribution over the surface is significantly non-uniform, and this characterizes non-uniform hydrate dissociation within the granule volume. Dissociation kinetics for the natural and artificial samples was studied at different heat fluxes. The maximal heat flux and maximal dissociation rate were achieved at combustion of methane hydrate. Both instantaneous and average dissociation rates were measured.

AB - Dissociation of hydrate systems is studied experimentally: gas hydrate of methane produced artificially in the reactor-crystallizer; natural gas hydrates of methane; water-methane-isopropanol systems in the air atmosphere. Artificial gas hydrate of methane and natural hydrates demonstrate the ranges of abnormally low dissociation rate. At that the boundaries of the temperature windows of self-preservation differ significantly for natural and artificial hydrate systems. Despite the similar structures of elementary hydrate cells of natural and artificial gas hydrates, the dissociation rate of natural samples was significantly lower than the dissociation rate of artificial powders. Moreover, natural hydrates had the expanded time period of the stable thermodynamic state. The mechanism of gas hydrate dissociations depends not only on the driving forces and structural characteristics, but also on the average initial diameter of the powder particles. The creep properties of gas hydrates and limits of their strength are associated with microstructural characteristics, and the dissociation rate depends on the size of the grains. The temperature fields of separate granule surface were obtained via many-times magnification of thermal images. Temperature distribution over the surface is significantly non-uniform, and this characterizes non-uniform hydrate dissociation within the granule volume. Dissociation kinetics for the natural and artificial samples was studied at different heat fluxes. The maximal heat flux and maximal dissociation rate were achieved at combustion of methane hydrate. Both instantaneous and average dissociation rates were measured.

KW - Creep

KW - Hydrate combustion

KW - Hydrate dissociation

KW - Pores

KW - Self-preservation

UR - http://www.scopus.com/inward/record.url?scp=84884365473&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84884365473&partnerID=8YFLogxK

U2 - 10.1016/j.ces.2013.08.049

DO - 10.1016/j.ces.2013.08.049

M3 - Article

VL - 104

SP - 1

EP - 9

JO - Chemical Engineering Science

JF - Chemical Engineering Science

SN - 0009-2509

ER -