Visualization of Movement and Expansion of Coal Reaction Zone by Acoustic Emission Monitoring in Underground Coal Gasification System

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  • 入口, 梨佳
    九州大学大学院工学府地球資源システム工学専攻
  • 石井, 悠真
    九州大学大学院工学府地球資源システム工学専攻
  • 濵中, 晃弘
    九州大学大学院工学研究院地球資源システム工学部門
  • Su, Faqiang
    School of Energy Science and Engineering, Henan Polytechnic University
  • 板倉, 賢一
    室蘭工業大学大学院工学研究科しくみ解明系領域寄附講座「未利用資源エネルギー工学講座」
  • 児玉, 淳一
    北海道大学大学院工学研究院環境循環システム部門地圏循環工学分野
  • 笹岡, 孝司
    九州大学大学院工学研究院地球資源システム工学部門
  • 島田, 英樹
    九州大学大学院工学研究院地球資源システム工学部門
  • Deguchi, Gota
    特定非営利活動法人地下資源イノベーションネットワーク

説明

Underground coal gasification (UCG) is the process of directly recovering energy as combustible gases such as hydrogen and carbon monoxide by combusting unmined coal resources in situ. The UCG process is an invisible phenomenon, in which fracturing activity at high temperature (>1000 °C) in coal seams expands the gasification zone and increases the combustible components of the product gas. However, excessive expansion of the gasification zone may cause environmental problems such as gas leakage, deformation of the surrounding ground, and groundwater pollution. Therefore, visualization of the gasification zone of UCG is required for both improving gasification efficiency and developing UCG systems with low environmental impact. In this study, the large-scale model UCG experiments conducted on a laboratory scale (size: 625 mm × 650 mm × 2792 mm (H × W × L)) were carried out to discuss the visualization of the gasification reaction zone of coal in UCG by Acoustic Emission (AE) technique with uniaxial and triaxial acceleration transducers. As the results of temperature monitoring and AE source location analysis show, AE sources are located near the high-temperature zone (>1000 °C). In addition, the located AE sources move and expand with the movement and expansion of the high-temperature zone. AE measurement can be a useful technique for monitoring the progress of the UCG reaction zone. AE measurement with triaxial sensors is also useful to predict a high-temperature zone though the measurable range, which has to be considered.

収録刊行物

  • Eng

    Eng 4 (4), 2960-2977, 2023-11-30

    Multidisciplinary Digital Publishing Institute : MDPI

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