Estimation of gasification area of underground coal gasification by using acoustic emission monitoring

Akihiro Hamanaka, Ken ichi Itakura, Fa qiang Su, Gota Deguchi, Jun ichi Kodama

研究成果: 著書/レポートタイプへの貢献会議での発言

抄録

Underground coal gasification (UCG) is a process of producing combustible gases by the in-situ conversion of coal into gaseous products. Coal resources abandoned under the ground for either technical or economic reasons can be recovered with economically and less environmental impacts by UCG; therefore, this technology is regarded as a clean coal technology. UCG has several advantages of low investments, high efficiency, and high benefits compared to conventional coal gasification. However, some environmental risks such as gas leakage, surface subsidence, and underground water pollution are difficult to control because the process is invisible. The reactor in UCG is unstable and expands continuously due to fracturing activity caused by coal combustion. It is, therefore, considered that acoustic emission (AE) is an effective tool to monitor the fracturing activities and visualize the inner part of coal. For this study, UCG model experiments were conducted using coal blocks of 0.55 × 0.60 × 2.74 m to discuss the applicability of AE monitoring for the estimation of the crack generations during UCG process and the extent of the gasification area. Temperatures were also monitored because the crack generations were strongly related to thermal stress occurred by coal combustion and heat transfer. The monitoring results of AE agreed with the measured data of temperatures and the gasification area; the source location of AE was detected around the region temperature increased and the gasification area. Additionally, the gasified coal amount can be predicted by using the data of product gas. Therefore, AE monitoring combined with the prediction of reacted coal amount are expected to be a useful tool as monitoring system of the gasifier in the underground.

元の言語英語
ホスト出版物のタイトルISRM International Symposium - 10th Asian Rock Mechanics Symposium, ARMS 2018
出版者International Society for Rock Mechanics
ISBN(電子版)9789811190032
出版物ステータス出版済み - 1 1 2018
イベント10th Asian Rock Mechanics Symposium, ARMS 2018 - Singapore, シンガポール
継続期間: 10 29 201811 3 2018

出版物シリーズ

名前ISRM International Symposium - 10th Asian Rock Mechanics Symposium, ARMS 2018

会議

会議10th Asian Rock Mechanics Symposium, ARMS 2018
シンガポール
Singapore
期間10/29/1811/3/18

Fingerprint

coal gasification
gasification
Coal
Coal gasification
acoustic emission
Acoustic emissions
Gasification
coal
Monitoring
monitoring
Coal combustion
Gases
fracturing
crack
gas
Groundwater pollution
Cracks
cracks
gases
temperature

All Science Journal Classification (ASJC) codes

  • Geochemistry and Petrology
  • Geophysics

これを引用

Hamanaka, A., Itakura, K. I., Su, F. Q., Deguchi, G., & Kodama, J. I. (2018). Estimation of gasification area of underground coal gasification by using acoustic emission monitoring. : ISRM International Symposium - 10th Asian Rock Mechanics Symposium, ARMS 2018 (ISRM International Symposium - 10th Asian Rock Mechanics Symposium, ARMS 2018). International Society for Rock Mechanics.

Estimation of gasification area of underground coal gasification by using acoustic emission monitoring. / Hamanaka, Akihiro; Itakura, Ken ichi; Su, Fa qiang; Deguchi, Gota; Kodama, Jun ichi.

ISRM International Symposium - 10th Asian Rock Mechanics Symposium, ARMS 2018. International Society for Rock Mechanics, 2018. (ISRM International Symposium - 10th Asian Rock Mechanics Symposium, ARMS 2018).

研究成果: 著書/レポートタイプへの貢献会議での発言

Hamanaka, A, Itakura, KI, Su, FQ, Deguchi, G & Kodama, JI 2018, Estimation of gasification area of underground coal gasification by using acoustic emission monitoring. : ISRM International Symposium - 10th Asian Rock Mechanics Symposium, ARMS 2018. ISRM International Symposium - 10th Asian Rock Mechanics Symposium, ARMS 2018, International Society for Rock Mechanics, 10th Asian Rock Mechanics Symposium, ARMS 2018, Singapore, シンガポール, 10/29/18.
Hamanaka A, Itakura KI, Su FQ, Deguchi G, Kodama JI. Estimation of gasification area of underground coal gasification by using acoustic emission monitoring. : ISRM International Symposium - 10th Asian Rock Mechanics Symposium, ARMS 2018. International Society for Rock Mechanics. 2018. (ISRM International Symposium - 10th Asian Rock Mechanics Symposium, ARMS 2018).
Hamanaka, Akihiro ; Itakura, Ken ichi ; Su, Fa qiang ; Deguchi, Gota ; Kodama, Jun ichi. / Estimation of gasification area of underground coal gasification by using acoustic emission monitoring. ISRM International Symposium - 10th Asian Rock Mechanics Symposium, ARMS 2018. International Society for Rock Mechanics, 2018. (ISRM International Symposium - 10th Asian Rock Mechanics Symposium, ARMS 2018).
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