WÄRTSILÄ WARTSILA 50DF, Product Manual

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13.2.2 Other Legislations
There are also other local legislations in force in particular regions.
13.3 Methods to reduce exhaust emissions
All standard Wärtsilä engines meet the NOx emission level set by the IMO (International Maritime
Organisation) and most of the local emission levels without any modifications. Wärtsilä has
also developed solutions to significantly reduce NOx emissions when this is required.
Diesel engine exhaust emissions can be reduced either with primary or secondary methods.
The primary methods limit the formation of specific emissions during the combustion process.
The secondary methods reduce emission components after formation as they pass through
the exhaust gas system.
For dual fuel engines same methods as mentioned above can be used to reduce exhaust
emissions when running in diesel mode. In gas mode there is no need for scrubber or SCR.
Refer to the "Wärtsilä Environmental Product Guide" for information about exhaust gas emission
control systems.
Wärtsilä 50DF Product Guide - a16 - 9 September 2016 13-5
13. Exhaust Emissions Wärtsilä 50DF Product Guide