| Project/Area Number |
12555055
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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 | 展開研究 |
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| Research Field |
Thermal engineering
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| Research Institution | TOKYO INSTITUTE OF TECHNOLOGY |
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Principal Investigator |
HIRAI Shuichiro Tokyo Institute of Technology, Research Center for Carbon Recycling and Energy, Professor, 炭素循環エネルギー研究センター, 教授 (10173204)
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| Co-Investigator(Kenkyū-buntansha) |
SUEKANE Tetsuya Tokyo Institute of Technology, Research Center for Carbon Recycling and Energy, Senior Professor, 炭素循環エネルギー研究センター, 助教授 (30262314)
OKAZAKI Ken Tokyo Institute of Technology, the Faculty of Engineering, professor, 大学院・理工学研究科, 教授 (20124729)
OSUMI Takashi Central Research Institute of Electric Power Industry, Senior Researcher, 我孫子研究所・環境化学部, 上席研究員
TSUSHIMA Shoji Tokyo Institute of Technology, the Faculty of Engineering, Research Associate, 大学院・理工学研究科, 助手 (30323794)
大隈 多加志 電力中央研究所, 我孫子研究所・環境化学部, 上席研究員
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| Project Period (FY) |
2000 – 2002
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| Project Status |
Completed (Fiscal Year 2002)
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| Budget Amount *help |
¥6,600,000 (Direct Cost: ¥6,600,000)
Fiscal Year 2002: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2001: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 2000: ¥4,600,000 (Direct Cost: ¥4,600,000)
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| Keywords | Global Warming / Hydrate / MRI / 地球温暖化問題 / ハイドルート |
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| Research Abstract |
Among various CO_2 ocean sequestration technologies, measures to restrict the increase of atmospheric CO_2 concentration, releasing CO_2 droplets from towed pipe of ship reduces biological impact by the dilution of dissolved CO_2 due to the motion of moving ship. CO_2 droplets, released around 1500m ocean depth, rise upward due to buoyancy and dissolved CO_2 at the sea depth of 500-1500m is considered to outgas to the atmosphere in 20-100 years. Here, we present a new concept of CO_2 sequestration in the ocean that CO_2 would dissolve at the sea depth deeper than the release point (I.e., 1500m) and biological impact would be minimized. Before releasing CO_2 droplets from the tip of towed pipe of moving ship, hydrate line particles are formed by injecting water small droplets inside CO_2 droplets. Since density of hydrate is 1.1g/cm3, CO_2 droplets including hydrate line particles more than 40vol% sink downward from release point into deep ocean that result in longer term sequestration. In addition, since depth of ocean is 4000m on an average, long travel distance for CO_2 droplets dissolution enables diluted CO_2 dissolution、 pH profiles in most of the part of sea depth would be larger than 7.0, Where biological impact would be minimized. The present concept is verified by an experiment.
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