Examples of Relationship between Combustion Period and Properties of Marine Heavy Fuel Oil

概要

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The combustion characteristics of marine heavy fuel seem to be managed by many factors, e.g. Density, Carbon Residue, Aromatisity, and Carbon/Hydrogen Ratio, Molecular Weight etc. When the causes of diesel engines' combustion troubles are searched, what properties should we primarily check to identify the main cause of the trouble? The authors studied the relationships between some properties and ignition delay (milli-second), combustion period (ms) of marine fuel oils submitted from ship owners, shipyards and surveyors by using a combustion test apparatus, so-called FIA 100. The authors found that; 1. The aromatisity index, CCAI, and Carbon/Hydrogen (Weight) Ratio has good correlation to the combustion characteristic of fuel oil, which cannot be ignored for a trouble shooting. 2. Carbon Residue, Asphaltene in fuel oil has no relationship to Ignition Delay, but some portion for Combustion Period. 3. Average Molecular Weight of fuel oil has less relationship to both Ignition Delay and Combustion Period. 4. Ignition Delay over 8 ms and Combustion Period over 28 ms might have some relationships to engine's operational problems.