Japan's hitachi zosen Corporation says it has become the first company to receive first-time approval (FTA) for a selective catalytic reduction (SCR) system for marine engines from its licensor MAN Diesel & Turbo. To meet IMO Tier Ⅲ NOx level reductions, Hitachi Zosen started developing an SCR system using its proprietary NOx removal catalyst on a test engine in 2009 in partnership with MAN. In 2011 the SCR system was certified by ClassNK and fitted in a new vessel for in-service testing that has been ongoing since November 2011. Hitachi Zosen says that the main advantage of its system is that it uses high-pressure exhaust gas upstream of the turbocharger that is high in density and requires only a low-capacity catalyst, resulting in a compact design less than half the size of conventional systems.
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