Abstract
IMO NOx regulation Tier 3 will come into force in 2016 and require NOx emission below a cycle value of 3.4 g/kWh in Emission Control Areas for marine low speed two-stroke engines. To comply with this regulation, a combined EGR (exhaust gas recirculation) & WEF (water emulsified fuel) system has been developed with minimum penalty in fuel oil consumption. A full-scaled Kawasaki-MAN B&W 2S50ME-C was provided for the test together with two turbochargers, one with cut-off system and the other with VT (variable turbine nozzle area) mechanism. A wet scrubber was also incorporated in the system to remove SOx and PM in the re-circulating gas and thus to prevent corrosion and contamination in the scavenging air system during EGR operation. The water treatment system, one of the most important systems for EGR, was developed to effectively remove PM from the washing water out of the scrubber using a special compact settling tank, too. The paper reports promising outcome from the tests and effectiveness of the combined system developed.
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