10th Symposium "The Working Process of the Internal Combustion Engine"
Challenges Developing Low Emission Combustion Processes for Heavy Fuel Oil Operated Diesel Engines
Authors
Georg Tinschmann, Morten Haatuft, Markus Müller, Philipp Henschen, MAN B&W Diesel AG, Augsburg
Year
2005
Summary
Marine diesel engines, burning heavy fuels with a high level of efficiency, are preferred for the propulsion of sea-going vessels. After ratification of the first international regulations on the limitation of gaseous emissions for marine diesel engines a tightening of the limits is to be expected. This contribution describes investigations carried out at MAN B&W Diesel AG to reduce emissions of medium speed diesel engines without affecting fuel consumption. With a combination of raised compression ratio and modified valve timing (Miller cycle) it is possible to reduce the NOx emissions significantly. Raising smoke values at low load can be counteracted with variable valve trains and electronically controlled injection systems. The flexibility of common rail injection systems is particulary advantegeous.
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