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Fuels & Engine and cleaning techniques - CAST

Fuels & Engine and cleaning techniques - CAST

Visible smoke - dirty

Visible smoke - dirty ships?• Exhaust blackness/opacity isproportional to pathlength*concentration (Beer-Lambert law)• Ship stacks have ~10 largerdiameter than truck and ~20times larger than vehicleexhaust pipes→Ship exhaust has ~20* highervisibility with same blackcarbon concentrations (&differentbackground)Ristimäki & Lappi 20118 / 9 © Wärtsilä 12.9.2012Fuels & engine and cleaning techniques / Jyrki RistimäkiDoc.ID: Revision: Status:

Specific black carbon emissions• Medium speed diesel engine(1995) BC emission is nearlyindependent of the fuel used• At loads above 25%, the BCemission is below EUROIIIemission level (conventional fuel injection/ jerk pump)– RATIONALE: with clean fuels &catalysts heavy duty vehicle PM ismostly BC• Ship engines:– High efficiency– Low emissionsRistimäki et al CIMAC 20109 / 9 © Wärtsilä 12.9.2012Fuels & engine and cleaning techniques / Jyrki RistimäkiDoc.ID: Revision: Status:

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