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Abstract
Underground Coal Gasification (UCG) requires monitoring of the gasification area because the gasification process is invisible and the reaction temperature exceeds 1000 °C. Many fracturing events that occurred due to coal heating can be captured with Acoustic Emission (AE) monitoring technique during UCG. However, the temperature conditions to generate fracturing events during UCG have not yet been clarified. Therefore, the coal heating experiment and small-scale UCG experiment are conducted by measuring the temperature and AE activities in this research to examine the applicability of the AE technique instead of temperature measurement as a monitoring method during UCG. As a result, many fracturing events are generated when the temperature of coal is changed drastically, especially during coal gasification. Besides, AE events increase in the sensor near the heat source and AE sources are expanded widely with the expansion of the high-temperature region. AE monitoring is an effective technique for the estimation of the gasification area during UCG instead of temperature monitoring.
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Details
1 Kyushu University, Department of Earth Resources Engineering, Fukuoka, Japan (GRID:grid.177174.3) (ISNI:0000 0001 2242 4849)
2 Muroran Institute of Technology, Endowed Research Lab. of Un-mined Mineral Resources and Energy Eng., Muroran, Japan (GRID:grid.420014.3) (ISNI:0000 0001 0720 5947)
3 Institut Teknologi Bandung, Department of Mining Engineering, Faculty of Mining and Petroleum Engineering, Bandung, Indonesia (GRID:grid.434933.a) (ISNI:0000 0004 1808 0563)
4 Hokkaido University, Division of Sustainable Resources Engineering, Sapporo, Japan (GRID:grid.39158.36) (ISNI:0000 0001 2173 7691)
5 Underground Resources Innovation Network, Sapporo, Japan (GRID:grid.39158.36)