This paper describes the fundamental study about the evaporation and combustion characteristics ofheavy fuel oil. Firstly, the difference of thermogravimetric curves between heavy fuel oil and marinediesel oil was examined using a thermobalance. Secondly, the combustion characteristics of a singledroplet of both fuels were observed in detail using a high-speed video camera. Furhermore, the fourtypes of hydrocarbons, saturated hydrocarbons "Sa", aromatic hydrocarbons "Ar", resin"Re" andasphaltene "Asp"were extracted from the fuels and evaporation and single droplet combustioncharacteristics of each were examined. The results obtained from the examinations are as follows:(1)Ar are surely one origine of soot formation. In case of marine diesel oil combustion, it is possiblethat combustion of Sa improves the combustion of Ar. Howevver, for heavy fuel oil which includesmuch heavier components, further investigation in combustion characteristics of Ar, Re and Asp isnecessary.; (2) Asp is the heaviest component to evaporate and easy to form cinder after the singledroplet combustion. Further, in one experiment all Asp was extracted from heavy fuel oil. This fuelthen showed better evaporation and combustion characteristics(i.e. less cinder formation) thannormal heavy fuel oil.
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