Volume 46 Issue 5
Oct.  2018
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LIU Huihu, WU Haiyan, XU Hongjie, LAN Tianhe. Supercritical CO2 adsorption characteristics and their control factors in deep-seated coal seams in southern Qinshui basin[J]. COAL GEOLOGY & EXPLORATION, 2018, 46(5): 37-42,48. DOI: 10.3969/j.issn.1001-1986.2018.05.006
Citation: LIU Huihu, WU Haiyan, XU Hongjie, LAN Tianhe. Supercritical CO2 adsorption characteristics and their control factors in deep-seated coal seams in southern Qinshui basin[J]. COAL GEOLOGY & EXPLORATION, 2018, 46(5): 37-42,48. DOI: 10.3969/j.issn.1001-1986.2018.05.006
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Supercritical CO2 adsorption characteristics and their control factors in deep-seated coal seams in southern Qinshui basin

  • 1. State Key Laboratory of Deep Coal Mining & Environment Protection, Huainan Mining Industry(Group) Co., Ltd., Huainan 232001, China;

  • 2. School of Earth and Environment, Anhui University of Science & Technology, Huainan 232001, China;

  • 3. School of Foreign Language, Anhui University of Science & Technology, Huainan 232001, China

Funds: 

National Natural Science Foundation of China(41330638,41727801)

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  • Received Date: June 04, 2018
  • Published Date: October 24, 2018
    Graphical Abstract
    • Abstract
  • In order to reveal the characteristics and control mechanism of supercritical CO2 (ScCO2) adsorption in deep-seated coal seams, coal No.3 from Yuwu coal mine, Sihe coal mine and Chengzhuang coal mine was chosen as the research object, the isothermal adsorption experiments in different temperature(45℃, 62.5℃, 80℃)were conducted with the maximum pressure above the supercritical pressure of CO2 by means of homemade isothermal adsorption instrument. The results show that the adsorption isotherm of ScCO2 under the condition of high temperature and high pressure is different from the adsorption isotherm of CO2 under normal temperature and pressure. The excess adsorption capacity of ScCO2 had the variation of 4 sections, the absolute adsorption capacity of ScCO2 had the variation of 3 sections. The pressure points matched with the maximum on excess adsorption capacity of ScCO2 had the characteristics of drifting high pressure with increase of the formation temperature. The excess adsorption capacity of ScCO2 was far below the absolute adsorption capacity of ScCO2, they couldn't be explained ith the adsorption model of Langmuir. The temperature has an obvious inhibition to the adsorption of ScCO2, the moisture content has no inhibition to the adsorption of ScCO2, the high ash content has an obvious inhibition to the adsorption of ScCO2, the high vitrinite and Rmax have a relatively obvious promotion to the adsorption of ScCO2. The adsorption capacity of ScCO2 is controlled by micropore and transitional pore, is especially related to the amount of specific surface area from micropore, the decrease on the adsorption ability of ScCO2 from high metamorphic coal may be caused by filling of the minerals in coal.
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