MAN Diesel & Turbo 6S46MC-C8 engine fulfils IMO Tier3 with SCR.

By Keith Henderson at March 24, 2011 08:40
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The engine was built by licensee Hitachi Zosen in their Araike works in Japan last year and a testing programme with factory personnel commenced in January 20111. The purpose was to commission the engine control system and optimize the integration of the SCR equipment.

The engine is a six cylinder, slow speed, two stroke engine in the S46MC series with mechanical injection and camshaft operated exhaust valves. It has a bore of 460 mm and stroke of 1,932 mm and develops about 7 MW at a speed of up to 129 rpm. The engine is destined for a general cargo carrier built at the Nakai shipyard and due to enter service in late 2011.

The SCR removes NOx from the exhaust using urea as an activator. The system can remove in excess of 80 per cent of the NOx based on the engine load cycle and more than 70 per cent NOx reduction on each load point in the load cycle.

Further reduction of emissions in the exhaust system are achieved using Exhaust Gas Recirculation (EGR) techniques. The engine control system automatically adjusts the SCR and EGR variables to deliver the desired result.

On completion of the tests, MAN Diesel & Turbo claimed a world first as the engine met all emission requirements laid down by the International Maritime Organsation’s Tier 3 regulations coming into force in 2016.

Caption: The world’s first Tier-III-compliant, two-stroke engine –  an MAN B&W 6S46MC-C8 type – pictured here
at the Hitachi’s Ariake works in southern Japan (engine on the right)

[image credit MAN Diesel & Turbo / Hitachi Zosen]




Caption: Close up view of the SCR positioned to the left of the right hand engine in the photo above.

[Image credit MAN Diesel & Turbo / Hitachi Zosen]

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