Articles

Influence of temperature on the replacement of CH4 by supercritical CO2

  • FAN Jingjing ,
  • WANG Yanbin ,
  • WANG Jin
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  • College of Geoscience and Surveying Engineering, China University of Mining & Technology, Beijing 100083, China

Received date: 2015-08-16

  Revised date: 2015-11-02

  Online published: 2016-01-07

Abstract

An experiment for replacement of CH4 by CO2 was conducted under different temperatures (35, 45, and 55℃) and the same injection pressure (12.7 MPa) using ISO-300 isothermal adsorption experiment instrument for studying the influence of temperature on the replacement of CH4 by supercritical CO2. Coal samples of Tunliu mine were used as the research subjects. The results show that during the replacement and desorption process, the adsorbed phase concentration of supercritical CO2 increased with increase of the temperature and decrease of the pressure, while the concentration variation of CH4 was in an opposite way. Under supercritical conditions, laboratory measurement of the adsorption capacity is the adsorption of Gibbs. The relationship between real adsorption capacity and pressure accords with the Langmuir adsorption curve. With increasing pressure, the difference between calculated and Gibbs adsorption capacity increased. The CH4 desorption rate at unit pressure drop reached the highest at the temperature of 35℃ under the experiment pressure drop, and when the temperature was close to the supercritical temperature, the replacement effect of supercritical CO2 reached the best.

Cite this article

FAN Jingjing , WANG Yanbin , WANG Jin . Influence of temperature on the replacement of CH4 by supercritical CO2[J]. Science & Technology Review, 2015 , 33(24) : 28 -33 . DOI: 10.3981/j.issn.1000-7857.2015.24.005

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