| Project/Area Number |
18560735
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Reaction engineering/Process system
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| Research Institution | Keio University |
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Principal Investigator |
TERASAKA Koichi Keio University, Faculty of Science and Technology, Associate Professor (00245606)
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| Project Period (FY) |
2006 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥3,890,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥390,000)
Fiscal Year 2007: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2006: ¥2,200,000 (Direct Cost: ¥2,200,000)
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| Keywords | Carbon Dioxide / Molten Salt / Slurry Bubble Column / Lithium Silicate |
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| Research Abstract |
The study has been done for 2007-2008 to obtain the fundamental data in terms of the absorption and desorption of carbon dioxide using a circulating slurry bubble column in which lithium silicate fine particles are suspended in molten lithium-potassium carbonate at high temperature.
That was summarized as follows :
1. Analysis of dissolution and stripping behavior of CO_2 bubble into molten salt slurry
The lithium silicate fine particles and molten Li-K-carbonate were prepared in the hot reactor. The model flue gas which has 20% CO_2 and 80% N_2 was fed into the reactor. The absorbed CO_2 was observed by measuring mass balance of CO_2 in the reactor when the mass of lithium silicate and the composition of molten salt were changed. Maximum absorption rate and solubility of CO_2 in molten salt were measured by the time course of CO_2 concentration in effluent gas from the reactor. The effects of influent gas flow rate, composition in molten salt and slurry concentration on gas bubble behavior were investigated.
On the other hand, the stripping behavior of CO_2 was investigated when the reactor was heated up to the desorption temperature. The effects of the mass of lithium silicate, temperature and heating rate on the stripping rate of CO_2 were discussed. In this study, the limited process was the CO_2 molecular transfer in the molten salt, that is, CO_2 dissolution from bubbles governed the overall reaction rate.
2. Hydrodynamics in circulating slurry bubble column
To experimentally simulate the gas-liquid-solid hydrodynamics in high temperature reactor under the room temperature, the cold model was used. The 1 micron PVC particles was used as instead of lithium silicate particles and the surfactant aqueous solution was used as a imitation liquid of molten salt. By using a designed circulating slurry bubble column, the gas holdup and the circulation rate of liquid were investigated to know the fundamental information to apply for industry.
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