January 26, 2004
MAN B&W diesels for NCL newbuilds
MAN B&W Diesel Group is to supply a total of ten 12V48/60B diesel engines to Meyer Werft, Germany for two 2,400 passenger Norwegian Cruise Line (NCL) newbuildings. The first five diesels engines, each producing 14,400 kW (19,600 hp), will be delivered in July, the remaining engines will be supplied in April 2005.
The engines are equipped with IS (Invisible Smoke) technology, which means that the exhaust gas is invisible within the operating load range. This feature is particularly important for cruise vessels. In addition, the engines utilize an environmentally friendly nitrogen-oxide (NOx) reduction technology, obtained by fuel-water emulsion (FWE). Water injection into the combustion chamber reduces temperature peaks and results in a clearly lower exhaust gas NOx content.
The engines being delivered for the NCL newbuilds are a new version of MAN B&W's successful 48/60B medium-speed engine series. Based on the successful 48/60 type, of which some 300 engines have been sold, this further developed version takes advantages of the latest diesel technology. "Almost every essential feature has been improved without any adverse effect on the well-known robustness of this engine series," says MAN B&W.
Among other things, the shape of the combustion chamber has been optimized and the compression ratio increased. The minimum fuel consumption amounts to 173 g/kWh, which is 7 g/kWh less, compared to the 48/60 series. The emission value of the IMO NOx test cycle amounts to 12 g/kWh, which is a reduction of 8 percent compared with the previous design. Should the FWE system be used, this value is even lower.