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Combined Analytic Hierarchy Process and Weighted Interval Method Models for the Geological Evaluation of CO 2 Storage in Coal Goaf

Author

Listed:
  • Dongzhuang Hou

    (College of Geology and Environment, Xi’an University of Science and Technology, Xi’an 710054, China)

  • Yifei Xiao

    (College of Geology and Environment, Xi’an University of Science and Technology, Xi’an 710054, China)

  • Lang Liu

    (College of Energy Engineering, Xi’an University of Science and Technology, Xi’an 710054, China)

  • Chao Huan

    (College of Energy Engineering, Xi’an University of Science and Technology, Xi’an 710054, China)

Abstract

The increasing concentration of CO 2 in the atmosphere is a major factor contributing to climate change. CO 2 storage in coal goaf is a convenient, effective, and economical solution. Methods to quickly and effectively evaluate geological conditions are urgently required. The main influencing factors are geological safety, storage potential, economics, and environmental protection; these include 4 aspects, 38 indexes, and 4 index levels that can be quantified using classification levels. We established a geological evaluation model, using analytic hierarchy process (AHP) and weighted interval methods. AHP was used to determine its elements, indicators, and inter-layer relationships, as well as to clarify its structural relationships. The weight interval method is used to evaluate unstable elements, reducing their difficulty, and constant values are used to assign weights of stable elements to increase accuracy. This model was applied to assess the suitability of the goaf in Yaojie mine for geological CO 2 storage. The results revealed that this goaf is an above average CO 2 storage space, which was consistent with previous research. This geological CO 2 storage evaluation model may also be used to assess the CO 2 storage suitability of other coal goafs.

Suggested Citation

  • Dongzhuang Hou & Yifei Xiao & Lang Liu & Chao Huan, 2024. "Combined Analytic Hierarchy Process and Weighted Interval Method Models for the Geological Evaluation of CO 2 Storage in Coal Goaf," Energies, MDPI, vol. 17(11), pages 1-18, May.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:11:p:2672-:d:1406144
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