Page 32: of Maritime Reporter Magazine (December 2012)

32Maritime Reporter & Engineering News Great Shipsof 2012nitrogen (N) and water (H2O) in the cat- alytic converter. Urea consumption, ac- cording to the shipping company, is about 7% from fuel consumption. Butpre-condition for the application ofSCR-systems is the use of low-sulfur fuel. Low-sulfur fuel is very important for most of the exhaust after treatment systems. All kinds of catalyst suffer from the impact of sulfur: premature aging,deterioration and contamination of thecatalytic coating and also the ceramicsupport material. The ordinary oxidation catalysts maintain furthermore the sul-fate formation; thus the exhaust will be enriched with toxic substances and thecorrosion of the exhaust system acceler- ated.Cellus? bunker capacity is about 340 tons of low-sulfur fuel, LS IFO 380 (sul- fur content: 0.6 to 0.9%), which reducesthe toxic substances in the exhaust. Cost per ton in October on the Rotterdammarket: about $680 (in comparison: MGO LS with only 0.1% sulfur content:$958)?Protection for human beings and theenvironment, even with our daily con- sumption of only 14 tons of fuel,? Chief Beller summed up, ?but it only makes sense if everybody participates. Much more needs to be done to get worldwide Left:Chief Jürgen Beller said: ?We are equipped with SCR-catalysts; they re-duce the NOx-emissionby over 90%.?Right:The urea-injection devicefor the main engine.Main engine, an 8-cylinder MaK inline engine delivers 3,840 kW @ 600 rpm.MR#12 (26-33):MR Template 12/3/2012 2:28 PM Page 32