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Effect of microwave-assisted cyclic oxidation on the coal internal and surface structure based on NMR and AFM

Author

Listed:
  • Li, He
  • Cao, Jieyan
  • Lu, Jiexin
  • Lin, Baiquan
  • Lu, Yi
  • Shi, Shiliang
  • Yang, Wei
  • Hong, Yidu
  • Liu, Ting
  • Liu, Meng

Abstract

Exploring new methods for comprehensive mining of coalbed methane (CBM) is a research hotspot. Pore connectivity has a significant impact on the permeability of coal, and as connectivity increases, it has a positive impact on the desorption and seepage of CBM. To quantify and visualize the pore development of coal under three cyclic treatments, T2 and T1-T2 spectra obtained by nuclear magnetic resonance (NMR) and Surface roughness obtained by atomic force microscope (AFM) were selected for characterization. The NMR results indicate that microwave-assisted cyclic oxidation can stimulate the formation of pores and pore throats and effectively dissolve the coal matrix, thereby changing the structure of the coal, manifested by a growth rate of −5.84 % for irreducible porosity and 31.5 % for producible porosity. Cyclic oxidation and microwave have a certain impact on the conversion of micropores to mesopores, but have a relatively less impact on the evolution of new pores. The maximum Rq and Ra obtained by AFM of microwave-assisted cyclic oxidation are 84.7 nm and 70.3 nm, respectively. Moreover, its Rsk and Rku are less than zero and three, respectively. This indicates that microwave-assisted cyclic oxidation has the best effect on changing the internal and surface morphology of coal.

Suggested Citation

  • Li, He & Cao, Jieyan & Lu, Jiexin & Lin, Baiquan & Lu, Yi & Shi, Shiliang & Yang, Wei & Hong, Yidu & Liu, Ting & Liu, Meng, 2024. "Effect of microwave-assisted cyclic oxidation on the coal internal and surface structure based on NMR and AFM," Energy, Elsevier, vol. 288(C).
    • Handle: RePEc:eee:energy:v:288:y:2024:i:c:s0360544223032668
    DOI: 10.1016/j.energy.2023.129872
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    References listed on IDEAS

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