| Co-Investigator(Kenkyū-buntansha) |
KITAGAWA Kuniyuki Nagoya University, EcoTopia Science Institute, Professor, エコトピア科学研究所, 教授 (00093021)
KOBAYASHI Noriyuki Nagoya University, EcoTopia Science Institute, Associate Professor, エコトピア科学研究所, 助教授 (90242883)
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| Budget Amount *help |
¥11,900,000 (Direct Cost: ¥11,900,000)
Fiscal Year 2005: ¥5,200,000 (Direct Cost: ¥5,200,000)
Fiscal Year 2004: ¥6,700,000 (Direct Cost: ¥6,700,000)
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| Research Abstract |
A tube reactor was constructed to study wet combustion of ethanol and hydrogen peroxide solutions in sub/super critical water. It was shown that stable combustion above 200℃, the peak temperature moved from bottom side of reactor to top side of reactor as the preheat temperature increased, and the temperature augmented as the concentration of hydrogen peroxide increased and temperature augmentation up to 120℃ could be obtained at the equivalence ratio of 1.4. When the concentration of hydrogen peroxide was smaller, partial oxidation of ethanol produced hydrogen, methane and carbon monoxide, on the other hand, when the concentration of hydrogen peroxide was larger, oxidation of ethanol produce carbon dioxide as a result of exothermic combustion. The oxidation reaction rate of ethanol in sub critical water was also measured by equipping extraction ports on the tube reactor.
Next, one-dimensional numerical simulation of wet combustion was performed on the bases of Lee-Kesler equation of state and governing equations considering viscosity, heat and mass transfer and overall chemical reaction. It was proved that the increase of specific heat could suppress the temperature augmentation when passing through the critical point, reaction occurred rapidly and the temperature peak moved up to the top side of the reactor when increasing the preheat temperature, and larger the concentration of hydrogen peroxide, larger the temperature increase.
The above results were reported in several domestic symposiums, such as Japanese Symposium on Combustion, and in several international symposiums, such as International Symposium on EcoTopia Science 2005. A paper on hydrothermal oxidation combustion was also accepted in the 31st International Symposium on Combustion held in August 2006, which will be published in the Proceedings of the Combustion Institute vol.31.
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