2006 Fiscal Year Final Research Report Summary
Development of shock-tube technique for hydrogen production using the low level energy of water vapor
| Project/Area Number |
17560176
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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 |
Thermal engineering
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| Research Institution | Yokohama National University |
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Principal Investigator |
TSUBOI Takao Yokohama National University, Faculty of Engineering, Professor, 大学院・工学研究院, 教授 (70017937)
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| Co-Investigator(Kenkyū-buntansha) |
ISHII Kazuhiro Yokohama National University, Faculty of Engineering, Associate Professor, 大学院・工学研究院, 助教授 (20251754)
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| Project Period (FY) |
2005 – 2006
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| Keywords | Shock tube / Water vapor / Hydrogen production / Water as reaction / Carbon particle |
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| Research Abstract |
The high temperature water-vapor containing carbon-particles was generated by using shock tube. The generation of hydrogen and carbon-monoxide from the carbon + water-vapor mixture were generated from water-gas reaction, And also the high temperature n-octane diluted with argon was generated by the same method. The hydrogen, ethylene, and soot were generated by the thermal decomposition and the thermal oxidation and the influence of the gas temperature, and the initial mixture ratio was observed experimentally. The following results were obtained: (1) the carbon particles blew up with argon in the test section of shock tube, when the argon gas blew on the carbon particles and the mixture was heated in the reflected shock wave. The time histories of the monochromatic emissive powers at the wavelengths 0.63, 0.80, 1.12, 1.52, 2.30, 3.44, 3.92, 4.26 μm were followed and the particle temperature was calculated using the Hottel-Broughton equation. It was confirmed that the particle of 5 μm
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diameter could be heated till the equilibrium temperature within 200 μs at temperature 1500-2000K. (2) The hydrogen gas of several thousands ppm was obtained in the reflected shock wave of our shock tube system. (3) The hydrogen, ethylene and the soot were observed in the shock-heated gas. Production of methane and acetylene was predicted. Helium and nitrogen were used as the driver gas and the rate of hydrogen production x={H_2}/[C_8H_<18>] was about 1 for nitrogen driver and the 1/10 for helium driver at T_5=1500 K. The apparent activation energy for the hydrogen production was 70-80 kJ/mol with the Arrhenius expression, when one used the reflected shock temperature T_5 as the representative temperature in this experiment. The rate of hydrogen production was proportional to the concentration of n-octane under 2000K. Furthermore the hydrogen production rate became larger, if the small amount of oxygen was added in the n-octane mixture.
From these results we confirmed that one can heat up the gas of the low-level-energy by using the shock wave system and that there is a possibility that using the energy the hydrogen gas from higher hydrocarbons was produced industrially. Less
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Research Products
(4 results)
