First ship engine using EGR to achieve Tier III limits
Engine producer MAN Diesel & Turbo has presented the first marine diesel engine using exhaust gas recirculation (EGR) techniques to achieve the stricter Tier III NOx emission standards of the International Maritime Organization (IMO). These standards will apply from 2016 to all new ships in dedicated NOx emission control areas (ECA).
According to MAN, this development means that strict emission limits can be met without significantly compromising engine performance – testing showed a low fuel penalty, equivalent to 1–3 g/kWh. The engine can also run in a fuel-optimised Tier II mode resulting in an approximate 4 g/kWh fuel-oil consumption reduction, which means that the engine is more efficient than today’s high-efficiency Tier II engines during transoceanic operation.
The engine will be installed in a Maersk Line C-class container vessel, currently under construction, and due for delivery in the first quarter of 2013. It has been agreed to operate the engine 20 per cent of the time in IMO Tier III mode, and to otherwise favour the fuel-optimised Tier II mode with low EGR rate.
Source: Press release from MAN Diesel & Turbo, 26 October 2012