The effectuation of the IMO/MARPOL 73/78 Annex VI and the requirement for reducing the sulfur content in accordance with future regulations have strongly influenced the qualities of marine residual fuels. For example, since light cycle oil (LCO) and clarified light cycle oil (CLO), which are obtained in the fluid catalytic cracking (FCC) process, contain a low level of sulfur and low viscosity, they are suitable for use as raw material for low sulfur fuels such as cutter stocks. However, a major portion of these types of oil generally contain aromatic compounds, and in the case they are blended in large quantities to marine residual fuel, its ignition and combustion quality deteriorate. As a result, lowered combustibility causes problems such as poor combustion in large two stroke diesel engines (main propulsion engines), which can potentially result in major failures such as damage to the piston rings and the cylinder liner. However, there is no limit value or criterion regarding ignition and/or combustion quality of marine residual fuel at the current moment. Therefore, fuel oil suppliers do not need to pay attention about ignition and/or combustion in the petroleum refinery process with which marine residual fuel MFO is made. Energy Institute (EI) had standardized the test method (IP541) of ignition and combustion characteristics for residual fuel by using constant volume combustion chamber such as Fuel Combustion Analyzer (FCA) in 2006. However, a practical evaluation method and the criterions for the ignition and combustion quality are currently under consideration in CIMAC and ISO, and are therefore not yet established. And, there are few reports on the ignition and combustion quality of a large number of marine residual fuels by IP541. Since combustion problems are increasing in recent years, the consumer takes the necessary measures to minimize engine problems caused by poor combustion quality. In this paper, we will report the results of investigation and research for ignition and combustion quality, and the experiences obtained from operations of engine.
Combustion quality of marine residual fuel - trend, control, effect on engine
2010
12 Seiten, 16 Bilder, 6 Tabellen, 10 Quellen
Aufsatz (Konferenz)
Datenträger
Englisch
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