Class awards SCR emissions certificate

22 Sep 2014
Kasper Moos, DFDS head of technical organisation (right) and Arnd Löttgen, member of the executive board, MAN Diesel & Turbo with the Tier III compatibility certificate from DNV GL

Kasper Moos, DFDS head of technical organisation (right) and Arnd Löttgen, member of the executive board, MAN Diesel & Turbo with the Tier III compatibility certificate from DNV GL

MAN Diesel & Turbo says it has been awarded a Tier III-compatibility certificate by DNV GL in respect of the MAN 8L21/31 four-stroke engine on a DFDS Seaways ship which has been retrofitted with an SCR system.

The company says that the engine alone meets IMO Tier II emission criteria, and the addition of SCR (selective catalytic reduction) raises the whole system to Tier III NOx standards.

The vessel in question, the Petunia Seaways, sails a regular route between Gothenburg, Immingham and Ghent. One of the ship’s auxiliary engines was retrofitted with an SCR system in 2012, and has been used in testing the technology over some 8,800 hours. According to MAN, the system has proven that cargo ships can meet strict IMO Tier III NOx emission levels, i.e. a 75% reduction in certain areas compared to current limits.

MAN Diesel & Turbo claims to be the first company to successfully make four-stroke marine engines IMO Tier III-compliant, based on its modular SCR kit that covers the whole range. The system injects urea into the exhaust gases and passes them through a catalytic converter at a temperature of 300° to 400°C. The system comprises the catalytic converter, a number of control units and a surveillance/control unit.

"It is important that we have proven to fulfil the same high standards that will be demanded by Tier III in the future", said Prof Dr Gunnar Stiesch, head of advanced engineering and exhaust after treatment, four-stroke engines.

"I am happy that we have helped develop a new, environmentally friendly technology. DFDS and other operators are definitely going to benefit from SCR meeting international standards", said Poul Woodall, director of sustainability and public affairs at DFDS Seaways.

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