Operation9270−1/A1
Winterthur Gas & Diesel Ltd.
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1.1 SCR System
Nitrogen oxides (NO and NO
2
) are made in secondary reactions n the engine during
fuel combustion.
In the SCR system, by use of catalyst elements and the injection of ammonia (which
is supplied by urea) the level of nitrogen oxide in the exhaust gas from the engine
decreases. At the catalyst, the urea has an effect on the nitrogen oxide to make
compounds that are not dangerous.
The catalytic effect is related to:
D The quantity of injected urea
D The quantity (surface) of catalyst elements
D The exhaust gas temperature.
1.2 SCR System to Engine Interface
The SCR system is installed between the exhaust gas manifold and the turbocharger.
A typical configuration is shown in Fig. 1.
The system design and the supply of components is divided between the SCR system
supplier, the shipyard and WinGD/engine builder.
WCH03754
Fig. 1: SCR System
2016−11
Selective Catalytic Reduction System
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