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Characterizing water vapor adsorption on coal by nuclear magnetic resonance: Influence of coal pore structure and surface properties

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  • Li, Yujie
  • Zhai, Cheng
  • Sun, Yong
  • Xu, Jizhao
  • Yu, Xu
  • Huang, Ting

Abstract

Steam injection is a novel and promising technology for enhancing coalbed methane (CBM) recovery. Accurate descriptions of the migration and adsorption of water vapor on coal is crucial for determining the occurrence state of the CBM and improving CBM production. This study quantitatively characterized the dynamic transport and adsorption processes of water vapor in coal pores and fractures using nuclear magnetic resonance (NMR). The results demonstrated that water vapor was preferentially adsorbed in the coal micropores, which was mainly related to capillary condensation, whereas liquid water filled a wide range of pores and fractures. Due to the differences in the microstructure and surface properties among different coals, the water vapor adsorption behaviors varied significantly. Among the coals used in this study, water vapor was most easily adsorbed on the bitumite with the biggest specific surface area, pore volume, pore area, the highest content of oxygen-containing functional groups, and the strongest wettability. Additionally, the coal pore structure had a greater impact on the water vapor adsorption capacity than the oxygen functional groups and the wettability. This research is of great significance for understanding the flow behaviors of water vapor in porous media and the interactions between coal and water.

Suggested Citation

  • Li, Yujie & Zhai, Cheng & Sun, Yong & Xu, Jizhao & Yu, Xu & Huang, Ting, 2023. "Characterizing water vapor adsorption on coal by nuclear magnetic resonance: Influence of coal pore structure and surface properties," Energy, Elsevier, vol. 282(C).
    • Handle: RePEc:eee:energy:v:282:y:2023:i:c:s0360544223018145
    DOI: 10.1016/j.energy.2023.128420
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    References listed on IDEAS

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