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

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  • Iriguchi, Rika
    Department of Earth Resources Engineering, Faculty of Engineering, Kyushu University
  • Ishii, Yuma
    Department of Earth Resources Engineering, Faculty of Engineering, Kyushu University
  • Hamanaka, Akihiro
    Department of Earth Resources Engineering, Faculty of Engineering, Kyushu University
  • Su, Faqiang
    School of Energy Science and Engineering, Henan Polytechnic University
  • Itakura, Ken-ichi
    Endowed Research Laboratory of Un-Mined Mineral Resources and Energy Engineering, Muroran Institute of Technology
  • Kodama, Jun-ichi
    Division of Sustainable Resources Engineering, Hokkaido University
  • Sasaoka, Takashi
    Department of Earth Resources Engineering, Faculty of Engineering, Kyushu University
  • Shimada, Hideki
    Department of Earth Resources Engineering, Kyushu University
  • Deguchi, Gota
    Mineral Resources Innovation Networks, Non-Profit Organization (NPO)

Description

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.

Journal

  • Eng

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

    Multidisciplinary Digital Publishing Institute : MDPI

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