With reference to marine diesel engine Selective Catalyst Reduction (SCR) (a) Explain, with the aid of a graph, the influence that fuel sulfur content has on the operation of an SCR unit (4) (b) Explain how the operation of a turbocharger system can have a detrimental effect on the unit when burning fuels with higher sulfur content (4) (c) Describe, with the aid of a sketch, a system which maintains good engine performance of the turbocharger system and good NOx reduction when burning fuels with higher sulfur content, explaining how conflicting conditions are met (8)
UKM Tuticorin 
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