Wartsila ?31DF Series Product Manual page 168

13. Exhaust Emissions
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.
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Wärtsilä 31DF Product Guide
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