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Study on the monitoring method of cavity growth in underground coal gasification under laboratory conditions

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  • Su, Fa-qiang
  • Wu, Jun-bo
  • Tao-Zhang,
  • Deng, Qi-chao
  • Yu, Yi-he
  • Hamanaka, Akihiro
  • Dai, Meng-Jia
  • Yang, Jun-Nan
  • He, Xiao-long

Abstract

The growth state of the combustion cavity during underground coal gasification (UCG) affects the gasification process's efficiency, stability, and accurate monitoring and control. In this study, a simulation experiment of UCG was performed, and a horizontal coaxial gasification channel was drilled based on the constructed artificial coal seam. Oxygen and air are used as gasification agents to provide a sufficient temperature field to sustain the gasification process. Moreover, the derivation of the gasification zone during UCG was developed using stratified temperature monitoring and acoustic emission damage monitoring. After the experiment, the artificial coal seam was cut to obtain the profile shape of the combustion cavity, which was compared with the temperature and acoustic emission monitoring results. The results show that the temperature distribution results in the coal seam and the calibration results of the acoustic emission source during horizontal coaxial UCG are consistent with the two-dimensional and three-dimensional combustion cavities reconstructed by the profile. Thus, the effectiveness of stratified temperature monitoring and acoustic emission monitoring to infer the gasification combustion cavity is proven.

Suggested Citation

  • Su, Fa-qiang & Wu, Jun-bo & Tao-Zhang, & Deng, Qi-chao & Yu, Yi-he & Hamanaka, Akihiro & Dai, Meng-Jia & Yang, Jun-Nan & He, Xiao-long, 2023. "Study on the monitoring method of cavity growth in underground coal gasification under laboratory conditions," Energy, Elsevier, vol. 263(PE).
    • Handle: RePEc:eee:energy:v:263:y:2023:i:pe:s0360544222029346
    DOI: 10.1016/j.energy.2022.126048
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    References listed on IDEAS

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    1. Daggupati, Sateesh & Mandapati, Ramesh N. & Mahajani, Sanjay M. & Ganesh, Anuradda & Mathur, D.K. & Sharma, R.K. & Aghalayam, Preeti, 2010. "Laboratory studies on combustion cavity growth in lignite coal blocks in the context of underground coal gasification," Energy, Elsevier, vol. 35(6), pages 2374-2386.
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    4. Su, Fa-qiang & Hamanaka, Akihiro & Itakura, Ken-ichi & Zhang, Wenyan & Deguchi, Gota & Sato, Kohki & Takahashi, Kazuhiro & Kodama, Jun-ichi, 2018. "Monitoring and evaluation of simulated underground coal gasification in an ex-situ experimental artificial coal seam system," Applied Energy, Elsevier, vol. 223(C), pages 82-92.
    5. Javed, Syed Bilal & Uppal, Ali Arshad & Bhatti, Aamer Iqbal & Samar, Raza, 2019. "Prediction and parametric analysis of cavity growth for the underground coal gasification project Thar," Energy, Elsevier, vol. 172(C), pages 1277-1290.
    6. Su, Fa-qiang & Itakura, Ken-ichi & Deguchi, Gota & Ohga, Koutarou, 2017. "Monitoring of coal fracturing in underground coal gasification by acoustic emission techniques," Applied Energy, Elsevier, vol. 189(C), pages 142-156.
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    3. Wang, Xiaorui & Zhang, Qinghe & Yuan, Liang, 2024. "A coupled thermal-force-chemical-displacement multi-field model for underground coal gasification based on controlled retraction injection point technology and its thermal analysis," Energy, Elsevier, vol. 293(C).

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