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Effect of Induced Oxidation on the Mechanical Properties of Lignite by using Hydrogen Peroxide in the SCG Method

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Title: Effect of Induced Oxidation on the Mechanical Properties of Lignite by using Hydrogen Peroxide in the SCG Method
Authors: Akm Badrul, Alam Browse this author
Aramaki, Noritaka Browse this author
Tamamura, Shuji Browse this author
Ueno, Akio Browse this author
Murakami, Takuma Browse this author
Tamazawa, Satoshi Browse this author
Fujii, Yoshiaki Browse this author →KAKEN DB
Kaneko, Katsuhiko Browse this author
Keywords: Induced oxidation
SCG method
Mechanical properties of lignite
Hydrogen peroxide
Issue Date: 26-Sep-2017
Publisher: 資源・素材学会
Journal Title: MMIJ Fall Meeting 2017
Volume: 4
Issue: 2
Start Page: 3305-12-03
Abstract: The lignite resource of the Tempoku coal field in Hokkaido, Japan is under consideration at our institute for production of biomethane from lignite using the subsurface cultivation and gasification method. The first stage of the method is important and involves dissolved organic carbon (DOC) formation by induced oxidation of lignite using H2O2 solution. The subsequest stages involve methanogen cultivation by the organic carbon as substrates to produce biomethane and the the last stage is gas recovery. To obtain more insight into the important first stage, changes in mechanical properties of lignite by induced oxidation were investigated in this research. These properties are important from a groung control standpoint. Lignite core specimens 30 mm in diameter and 60 mm in height were immersed into a 1 wt.% H2O2 solution having a liquid/solid ratio of 5:1 to induce oxidation at atmospheric pressure and room temperature. P-wave velocity and density were measured before and after immersion. A series of uniaxial compression tests and the Brazilian tests were performed on both the induced-oxidized (H2O2-immersed) and unoxidized (H2O-immersed) specimens. Intense oxidation was observed at most parts of the exposed surface of lignite specimens, whereas slight oxidation was expected to occur in inner parts, at the specified experimental condition. The induced oxidation of lignite produced DOC, resulting in a decrease of 1.79% and 0.54% in the average P-wave velocity and average density respectively. The P-wave velocity of lignite showed positive correlations with the strength, static tangent modululs, dynamic Young's modulus, and tensile strength regardsless of the oxidation of lignite. Although the P-wave velocity and density decreased slightly in post DOC production by the induced oxidation, the damage of the lignite caused by H2O2 can be ignored during the design of SCG reactors at the given experimental condition.
Description: MMIJ Fall Meeting 2017, Sept. 26-28 2017, Sapporo, Japan (資源・素材2017(札幌): 平成29年度資源・素材関係学協会合同秋季大会, 2017年9月26日~28日, 北海道大学, 札幌市)
Conference Name: MMIJ Fall Meeting
資源・素材2017(札幌): 平成29年度資源・素材関係学協会合同秋季大会
Conference Place: Sapporo
Type: proceedings
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 藤井 義明

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