414 バイオ燃料のオゾン改質とディーゼル機関への適用 : 燃料改質とオゾンの吸気系混入(新エネルギー(2),環境保全型エネルギー技術)

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We experimentally evaluate a performance and exhaust emissions of a single-cylinder, four stroke direct-injection type diesel engine with no modifications operating on BDF (biodiesel fuel) reforming by ozone-rich air containing ozone of about 900ppm generated by corona discharge ozonizer. The combustion characteristics, exhaust emissions such as NO_x, CO, THC, smoke and pressure indicator diagram in cylinder are compared with the case of BDF as base oil. It is expected that the flammable ozonide is generated in double bond of fatty acid contained in BDF by fuel reforming. On the other hand, the ozone rich air is mixing into intake air of diesel engine as oxidizer, and exhaust emissions of engine fueled with BDF are studied. We found that (1) the NO_x, CO, THC and smoke emissions of ozone-treated BDF are lower than base fuel in almost all load range, (2) ignition delay of ozone-treated BDF is shortened compared with the case of base fuel especially in the low load condition, (3) the intake air ozone effects on decreasing in THC and CO concentrations in the whole of load range, and reducing of ignition delay.
2008-07-09