SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2020, Vol. 28 ›› Issue (2): 492-501.DOI: 10.1016/j.cjche.2019.06.002

• Energy, Resources and Environmental Technology • Previous Articles     Next Articles

Decomposition of carbon dioxide hydrate in the samples of natural coal with different degrees of metamorphism

Vyacheslav G. Smirnov1, Valeriy V. Dyrdin1, Andrey Yu. Manakov2,3, Zinfer R. Ismagilov4   

  1. 1 Kuzbass State Technical University, Vesennaya str., 28, Kemerovo 650000, Russian Federation;
    2 Nikolaev Institute of Inorganic Chemistry SB RAS, Ac. Lavrentiev ave., 3, Novosibirsk 630090, Russian Federation;
    3 Novosibirsk State University, Pirogov Str., 2, Novosibirsk 630090, Russian Federation;
    4 Institute of Coal Chemistry and Material Science SB RAS, Sovetsky ave., 18, Kemerovo 650000, Russian Federation
  • Received:2019-03-16 Revised:2019-05-07 Online:2020-05-21 Published:2020-02-28
  • Contact: Andrey Yu. Manakov, Zinfer R. Ismagilov
  • Supported by:
    This work was supported by the project №18 "Study of the physicochemical properties of hydrate-containing rocks for the development of remote sensing methods and the characteristics of natural accumulations of gas hydrates" of the Integrated Basic Research Program of the Siberian Branch of the Russian Academy of Sciences.

Decomposition of carbon dioxide hydrate in the samples of natural coal with different degrees of metamorphism

Vyacheslav G. Smirnov1, Valeriy V. Dyrdin1, Andrey Yu. Manakov2,3, Zinfer R. Ismagilov4   

  1. 1 Kuzbass State Technical University, Vesennaya str., 28, Kemerovo 650000, Russian Federation;
    2 Nikolaev Institute of Inorganic Chemistry SB RAS, Ac. Lavrentiev ave., 3, Novosibirsk 630090, Russian Federation;
    3 Novosibirsk State University, Pirogov Str., 2, Novosibirsk 630090, Russian Federation;
    4 Institute of Coal Chemistry and Material Science SB RAS, Sovetsky ave., 18, Kemerovo 650000, Russian Federation
  • 通讯作者: Andrey Yu. Manakov, Zinfer R. Ismagilov
  • 基金资助:
    This work was supported by the project №18 "Study of the physicochemical properties of hydrate-containing rocks for the development of remote sensing methods and the characteristics of natural accumulations of gas hydrates" of the Integrated Basic Research Program of the Siberian Branch of the Russian Academy of Sciences.

Abstract: Methane and carbon dioxide hydrates are one of the possible forms in which these gases exist in natural coal (for more detailed discussion see Refs [1,2]). In this work, the decomposition of carbon dioxide hydrate in five samples of natural coal differing from each other in metamorphism degree was investigated experimentally. Carbon dioxide hydrate dispersed in coals was synthesized from water adsorbed in these coals. During a linear temperature rise in an autoclave with the coal + hydrate sample the hydrate decomposition manifests itself as a step of increase in gas pressure, accompanied by a decrease/stabilization of the temperature of coal sample. The dependencies of the amount of hydrate formed on initial coal humidity and on gas pressure during hydrate formation were studied. It was demonstrated that each coal sample is characterized by its own humidity threshold below which hydrate formation in natural coal is impossible. With an increase in gas pressure, the amount of water transformed into hydrate increases. For the studied coal samples, the decomposition of carbon dioxide hydrates proceeds within a definite temperature and pressure range, and this range is close to the curve of phase equilibrium for bulk hydrate.

Key words: Gas hydrate, Carbon dioxide, Coal, Coal rank, Phase transformation, Coal bed gas

摘要: Methane and carbon dioxide hydrates are one of the possible forms in which these gases exist in natural coal (for more detailed discussion see Refs [1,2]). In this work, the decomposition of carbon dioxide hydrate in five samples of natural coal differing from each other in metamorphism degree was investigated experimentally. Carbon dioxide hydrate dispersed in coals was synthesized from water adsorbed in these coals. During a linear temperature rise in an autoclave with the coal + hydrate sample the hydrate decomposition manifests itself as a step of increase in gas pressure, accompanied by a decrease/stabilization of the temperature of coal sample. The dependencies of the amount of hydrate formed on initial coal humidity and on gas pressure during hydrate formation were studied. It was demonstrated that each coal sample is characterized by its own humidity threshold below which hydrate formation in natural coal is impossible. With an increase in gas pressure, the amount of water transformed into hydrate increases. For the studied coal samples, the decomposition of carbon dioxide hydrates proceeds within a definite temperature and pressure range, and this range is close to the curve of phase equilibrium for bulk hydrate.

关键词: Gas hydrate, Carbon dioxide, Coal, Coal rank, Phase transformation, Coal bed gas