| Project/Area Number |
13450087
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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 |
Thermal engineering
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| Research Institution | Keio University |
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Principal Investigator |
MORI Yasuhiko h. Keio University, Dept. of Mechanical Engineering, Professor, 理工学部, 教授 (90051888)
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| Co-Investigator(Kenkyū-buntansha) |
KAJI Nobufuji The Polytechnic University, Dept. of Mechanical Engineering, Professor, 産業機械工学科, 教授
OGAWA Kuniyasu Keio University, Dept. of Mechanical Engineering, Assistant Professor, 理工学部, 講師 (50272703)
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| Project Period (FY) |
2001 – 2003
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| Project Status |
Completed (Fiscal Year 2003)
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| Budget Amount *help |
¥11,800,000 (Direct Cost: ¥11,800,000)
Fiscal Year 2003: ¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 2002: ¥4,000,000 (Direct Cost: ¥4,000,000)
Fiscal Year 2001: ¥5,900,000 (Direct Cost: ¥5,900,000)
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| Keywords | gas absorption / gas separation / mass transfer / heat transfer / environment preservation / energy utilization / CO_2 issue |
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| Research Abstract |
This project aimed to examine the utility and potential performance, as gas absorbers or direct gas-liquid contact heat exchangers, of "wetted-wire columns", a novel type of gas-liquid contact devices each equipped with a bundle of built-in vertically-oriented wires. Such a wetted-wire column allows a liquid absorbent to flow down each wire, being in contact with a gas mixture flowing countercurrently. The project was composed of four specific studies, which are outlined below in order.
1. The absorption of CO_2 from a CO_2/N_2 gas mixture into an aqueous monoethanolamine (MEA) solution in a "string-of-beads" flow on a single wire was studied both experimentally and theoretically, providing a fundamental understanding of the nature of chemical gas absorption with a on-wire flow of a liquid-absorbent.
2. A prototype wetted-wire column having 109 wires was constructed and tested in a series of experiments of CO_2-into-MEA-sol. absorption. The absorption performance of this column was found to be quite comparable to conventional packed-bed columns of the same size, while it imposes, on the internal gas flow, only a pressure loss smaller than that in the latter by one to two orders.
3. Then constructed was another 109-wire column equipped with a novel device for controlling the temperature of the liquid absorbent flowing on the wires. Having confirmed its successful operation, the third 109-wire column was constructed for use of a high-temperature gas approximating the flue gases in power plants. The merit of such temperature-control was recognized when the absorbent, an MEA solution, was exposed to a gas flow at temperature of 100℃ or above.
4. The air-to-silicone-oil heat transfer experiments were performed, using a 109-wire bundle installed in a closed-loop, temperature-controlled air tunnel. The obtained results indicate a practical applicability of wetted-wire columns to the operations for thermal-energy recovery from industrial waste gases.
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