9. Effects of Ultrasonic-Treatment on Marine Diesel Fuel Oil

概要

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Ultrasonic-treatment seems one of the most favorable treatment methods to be de-veloped in addition to the conventional centrifugal equipments for marine diesel fuel oil, so this experimental study was carried to make clear its effects upon physical and chemical properties of some kinds of heavy fuel oil. A special ultrasonic equipment, named K-7, was applied to this experiment. Viscosity, surface tension, gravity and specific heat of oil were measured strictly, and gaschromatography tests, spot tests, evaporation and combustion tests of a single oil droplet, and engine firing tests were carried before and after the treatment in accordance with many expectant conditions on board. The most effective result of the treatment is the fact that large sludges floating in and on oil are crushed and separated into very small particles by its cavitation effect, then oil itself becomes so homogeneous. Evaporation and combustion qualities of a single oil droplet become slightly favorable and this affects engine performance more or less, but other improvements on substantial properties of oil as a whole can hardly be expected from such treatment as we tried here.
社団法人日本船舶海洋工学会の論文