{"@context":{"@vocab":"https://cir.nii.ac.jp/schema/1.0/","rdfs":"http://www.w3.org/2000/01/rdf-schema#","dc":"http://purl.org/dc/elements/1.1/","dcterms":"http://purl.org/dc/terms/","foaf":"http://xmlns.com/foaf/0.1/","prism":"http://prismstandard.org/namespaces/basic/2.0/","cinii":"http://ci.nii.ac.jp/ns/1.0/","datacite":"https://schema.datacite.org/meta/kernel-4/","ndl":"http://ndl.go.jp/dcndl/terms/","jpcoar":"https://github.com/JPCOAR/schema/blob/master/2.0/"},"@id":"https://cir.nii.ac.jp/crid/1050580007679686656.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"HDL","@value":"https://hdl.handle.net/2324/7159363"}},{"identifier":{"@type":"DOI","@value":"10.3390/eng4040166"}},{"identifier":{"@type":"URI","@value":"https://www.mdpi.com/2673-4117/4/4/166/pdf"}}],"resourceType":"学術雑誌論文(journal article)","dc:title":[{"@language":"en","@value":"Visualization of Movement and Expansion of Coal Reaction Zone by Acoustic Emission Monitoring in Underground Coal Gasification System"}],"dc:language":"en","description":[{"type":"Abstract","notation":[{"@language":"en","@value":"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."}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1070580007679686659","@type":"Researcher","foaf:name":[{"@language":"en","@value":"Iriguchi, Rika"},{"@language":"ja","@value":"入口, 梨佳"},{"@language":"ja-Kana","@value":"イリグチ, リカ"}],"jpcoar:affiliationName":[{"@language":"en","@value":"Department of Earth Resources Engineering, Faculty of Engineering, Kyushu University"},{"@language":"ja","@value":"九州大学大学院工学府地球資源システム工学専攻"}]},{"@id":"https://cir.nii.ac.jp/crid/1070580007679686656","@type":"Researcher","foaf:name":[{"@language":"en","@value":"Ishii, Yuma"},{"@language":"ja","@value":"石井, 悠真"},{"@language":"ja-Kana","@value":"イシイ, ユウマ"}],"jpcoar:affiliationName":[{"@language":"en","@value":"Department of Earth Resources Engineering, Faculty of Engineering, Kyushu 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Hideki"},{"@language":"ja","@value":"島田, 英樹"},{"@language":"ja-Kana","@value":"シマダ, ヒデキ"}],"jpcoar:affiliationName":[{"@language":"en","@value":"Department of Earth Resources Engineering, Kyushu University"},{"@language":"ja","@value":"九州大学大学院工学研究院地球資源システム工学部門"}]},{"@id":"https://cir.nii.ac.jp/crid/1070580007679686657","@type":"Researcher","foaf:name":[{"@language":"en","@value":"Deguchi, Gota"}],"jpcoar:affiliationName":[{"@language":"en","@value":"Mineral Resources Innovation Networks, Non-Profit Organization (NPO)"},{"@language":"ja","@value":"特定非営利活動法人地下資源イノベーションネットワーク"}]}],"publication":{"publicationIdentifier":[{"@type":"EISSN","@value":"26734117"},{"@type":"PISSN","@value":"26734117"}],"prism:publicationName":[{"@language":"en","@value":"Eng"}],"dc:publisher":[{"@value":"Multidisciplinary Digital Publishing Institute : MDPI"}],"prism:publicationDate":"2023-11-30","prism:volume":"4","prism:number":"4","prism:startingPage":"2960","prism:endingPage":"2977"},"reviewed":"false","dcterms:accessRights":"http://purl.org/coar/access_right/c_abf2","dc:rights":["© 2023 by the authors.","Creative Commons Attribution International"],"url":[{"@id":"https://www.mdpi.com/2673-4117/4/4/166/pdf"}],"foaf:topic":[{"@id":"https://cir.nii.ac.jp/all?q=combustion%20and%20gasification","dc:title":"combustion and gasification"},{"@id":"https://cir.nii.ac.jp/all?q=gasification%20control","dc:title":"gasification control"},{"@id":"https://cir.nii.ac.jp/all?q=hydrogen","dc:title":"hydrogen"},{"@id":"https://cir.nii.ac.jp/all?q=underground%20stopping%20stability","dc:title":"underground stopping stability"},{"@id":"https://cir.nii.ac.jp/all?q=underground%20coal%20gasification","dc:title":"underground coal gasification"},{"@id":"https://cir.nii.ac.jp/all?q=untapped%20energy","dc:title":"untapped energy"}],"dcterms:subject":[{"subjectScheme":"Other","notation":[{"@language":"en","@value":"combustion and gasification"}]},{"subjectScheme":"Other","notation":[{"@language":"en","@value":"gasification control"}]},{"subjectScheme":"Other","notation":[{"@language":"en","@value":"hydrogen"}]},{"subjectScheme":"Other","notation":[{"@language":"en","@value":"underground stopping stability"}]},{"subjectScheme":"Other","notation":[{"@language":"en","@value":"underground coal gasification"}]},{"subjectScheme":"Other","notation":[{"@language":"en","@value":"untapped energy"}]}],"project":[{"@id":"https://cir.nii.ac.jp/crid/1040287907233168384","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"21K14575"},{"@type":"JGN","@value":"JP21K14575"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21K14575/"}],"notation":[{"@language":"ja","@value":"低品位炭の有効利用に向けた石炭地下ガス化におけるAE発生メカニズムの解明"},{"@language":"en","@value":"Mechanism of AE Generation in Underground Coal 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