Study on the mechanism of self-preservation of gas hydrates
| Project/Area Number |
23360436
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Energy engineering
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| Research Institution | Osaka University |
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Principal Investigator |
SATO Hiroshi 大阪大学, 基礎工学研究科, 准教授 (60283743)
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| Co-Investigator(Kenkyū-buntansha) |
OHGAKI Kazunari 大阪大学, 基礎工学研究科, 教授 (80107078)
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| Research Collaborator |
IWASAKI Toru 三井造船, 技術総括部
TAKAHASHI Masahiro 三井造船, 千葉技術開発センター
MIMACHI Hiroko 三井造船, 千葉技術開発センター
KINOSHITA Takahiro 三井造船, 千葉技術開発センター
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| Project Period (FY) |
2011-04-01 – 2014-03-31
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥19,370,000 (Direct Cost: ¥14,900,000、Indirect Cost: ¥4,470,000)
Fiscal Year 2013: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2012: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2011: ¥17,550,000 (Direct Cost: ¥13,500,000、Indirect Cost: ¥4,050,000)
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| Keywords | ガスハイドレート / 自己保存性 / 天然ガス / 新エネルギー / エネルギー輸送 |
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| Research Abstract |
To elucidate the mechanism of self-preservation of gas hydrates, the effects of electrolytes on the decomposition rates of methane hydrate (structure I), ethane hydrate (structure I), and krypton hydrate (structure II) were studied. Decomposition was significantly suppressed just below the eutectic temperature of the electrolyte + water system. When the concentration of the electrolyte was relatively high, however, a transitory upsurge in the decomposition rate occurred at the eutectic temperature. We speculate that the presence of electrolyte crystals increases the mobility of water molecules just below the eutectic temperature. This promotes the formation of a contiguous layer of ice that acts as an obstacle to diffusion of the evolved gas. However, when the temperature exceeds the eutectic temperature, the advent of stable liquid causes local melting of the ice layer with consequent weakening of the barrier for gas diffusion.
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Report
(4 results)
Research Products
(7 results)
