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Gasification characteristics and thermodynamic analysis of ultra-lean oxygen oxidized lignite residues

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  • Chen, Liangzhou
  • Qi, Xuyao
  • Zhang, Yabo
  • Rao, Yuxuan
  • Wang, Tao

Abstract

Recent developments in the in-situ transformation of coal resources have heightened the possibility of exploring the oxidized coal regasification in coalfield fires. For further understanding the regasification characteristics of oxidized lignite residues in coalfield fire, Shengli lignite was selected for conducting ultra-lean oxygen pre-oxidation under different isothermal temperatures and CO2 regasification experiments. Fourier transform infrared spectroscopy results indicate that higher temperature leads to the increase of aromatic hydrocarbon and reduction of aliphatic hydrocarbon side chains on the coal structure. It is found that the pre-oxidation of under 1% oxygen concentration and 300 °C will increase the specific surface area and pore volume, which would be beneficial for the following regasification. The analysis of gasification parameters suggests that the gasification quality and performance of lignite residues decline with the increasing oxygen concentration and rising isothermal temperatures in pre-oxidation. The kinetic analysis demonstrates that when the oxygen concentration ranges from 1% to 5%, the activation energy of gasification increases by 16.744 kJ/mol. The findings suggest that the lignite pre-oxidation under ultra-lean oxygen conditions will inevitably increase the activation energy of CO2 gasification, which causes the coal more difficult to be utilized effectively.

Suggested Citation

  • Chen, Liangzhou & Qi, Xuyao & Zhang, Yabo & Rao, Yuxuan & Wang, Tao, 2022. "Gasification characteristics and thermodynamic analysis of ultra-lean oxygen oxidized lignite residues," Energy, Elsevier, vol. 240(C).
    • Handle: RePEc:eee:energy:v:240:y:2022:i:c:s0360544221030450
    DOI: 10.1016/j.energy.2021.122796
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    References listed on IDEAS

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