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| Abstract |
Underground Coal Gasification (UCG) is a technique to recover combustible gases from coal by in-situ gasification in the underground. The composition of the product gas recovered from the coal can be ...controlled by the injection materials and reaction temperature. However, the gasification process that occurs in the underground is invisible and the coal seam temperature during UCG is over 1000°C, indicating that the excessive expansion of the gasification area may have a significant impact on the surrounding environment, e.g., gas leakage, subsidence, and groundwater contamination. On the other hand, the expansion of gasification contributes to increasing the combustible gas components in the product gas due to promoting the gasification reaction in a wide area. Therefore, the visualization of the gasification area of UCG plays an important role not only for the development of safe, environmentally friendly but also for highly efficient UCG systems. Since the thermal stress in the high-temperature area of the UCG causes fracture activity in the coal seam, this study discusses the applicability of acoustic emission (AE) measurement to monitor the underground gasification area. In this study, the model UCG experiment whose size was 550 × 600 × 2740 mm was carried out. During the experiment, acoustic emission (AE) were monitored with uniaxial and triaxial sensors to visualize the inner part of the coal seam. As a result, the movement and expansion of the gasification area can be monitored by AE source location analysis. AE monitoring is an effective technique to assess the gasification area instead of temperature measurement in UCG.show more
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