Investigation to Cope with Degraded Fuel Oils for Marine Use

Abstract

This report discuss how to use the new deteriorated marine fuels in diesel engines on the basis of experimental results obtained with a medium speed diesel engine.
The deterioration is caused by the Visbreaker-bottom and F.C.C. Tar as the components of fuels. This will provide effect on the performance and reliability of marine diesel engines. For example,
* Some fuels have poor combustion properties and cause some changes of combustion performance.
* Some fuels have a poor thermal stability.
* Some fuels have a poor compatibility with marine diesel oil.
* The catalyst fine in F.C.C. Tar causes a serious wear of FO pump plunger and cylinder liner without sufficient purification.
* Some fuels foul the lubricating oil.
It seems that almost these problems spoil the superiority of the diesel engines. But the results of our experiments show that the diesel engines are rather insensitive to these changes in fuel despite of its complex structure and restrictions as a combuster.
We expect that the remaining problems to use such fuels are not unsolvable and the diesel engines will be able to retain its superiority.