TY - JOUR
T1 - Study on Generating Acoustic Emission with Heating Coal for Application as Monitoring System for Underground Coal Gasification
AU - Hamanaka, A.
AU - Makabe, Y.
AU - Itakura, K.
AU - Sasaoka, T.
AU - Shimada, H.
AU - Widodo, N. P.
AU - Sulistianto, B.
AU - Deguchi, G.
N1 - Funding Information:
This work was supported by Mikasa City, the Japanese Society on UCG, and JSPS KAKENHI Grant Number JP21K14575. The authors gratefully acknowledge their support and express particular appreciation to UCG project members.
Publisher Copyright:
© Published under licence by IOP Publishing Ltd.
PY - 2021/10/27
Y1 - 2021/10/27
N2 - Underground Coal Gasification (UCG) is a technology to recover combustible gases by drilling holes and in-situ gasification. The establishment of a safe UCG system requires monitoring of the gasification reaction area because the gasification process that occurs in the underground is an invisible event. It is considered that Acoustic Emission (AE) monitoring is an effective technique for monitoring the underground gasification area since many fracturing activities occur in the coal seam due to coal heating. Therefore, the temperature condition of AE generations is investigated using the coal heating experiments and examines the applicability of AE measurement as a monitoring method for UCG. Measurements of temperature change and AE events with the thermocouples and the acceleration transducers during the coal specimen were heated. As a result, many AE events are found when the temperature of coal is changed and detected in the sensor where its location was near the heat source. Additionally, AE sources are expanded widely with the expansion of the high-temperature region based on the analysis results of the AE source location. It is possible to monitor the temperature change of coal and the expansion of the high-temperature region by applying AE measurement monitoring during UCG.
AB - Underground Coal Gasification (UCG) is a technology to recover combustible gases by drilling holes and in-situ gasification. The establishment of a safe UCG system requires monitoring of the gasification reaction area because the gasification process that occurs in the underground is an invisible event. It is considered that Acoustic Emission (AE) monitoring is an effective technique for monitoring the underground gasification area since many fracturing activities occur in the coal seam due to coal heating. Therefore, the temperature condition of AE generations is investigated using the coal heating experiments and examines the applicability of AE measurement as a monitoring method for UCG. Measurements of temperature change and AE events with the thermocouples and the acceleration transducers during the coal specimen were heated. As a result, many AE events are found when the temperature of coal is changed and detected in the sensor where its location was near the heat source. Additionally, AE sources are expanded widely with the expansion of the high-temperature region based on the analysis results of the AE source location. It is possible to monitor the temperature change of coal and the expansion of the high-temperature region by applying AE measurement monitoring during UCG.
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U2 - 10.1088/1755-1315/861/2/022036
DO - 10.1088/1755-1315/861/2/022036
M3 - Conference article
AN - SCOPUS:85118916203
SN - 1755-1307
VL - 861
JO - IOP Conference Series: Earth and Environmental Science
JF - IOP Conference Series: Earth and Environmental Science
IS - 2
M1 - 022036
T2 - 11th Conference of Asian Rock Mechanics Society, ARMS 2021
Y2 - 21 October 2021 through 25 October 2021
ER -