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Since the IMO Tier III standards are scheduled to come into effect at the beginning of 2016, the development of NOx reduction technologies is critical for marine diesel engines. The authors are developing an NHM (Nitrogen-enrichment / Humidification Membrane) system as a method to reduce NOx emissions. The NHM system is composed of polymeric gas separation membranes. Oxygen and water molecules can permeate the membranes faster than nitrogen molecules, so the system can feed SOx free, clean nitrogen-enriched and humidified intake air into an engine. The NHM system was connected to a four-stroke high-speed engine having a rated power of 103 kW and a rated speed of 2400 rpm. NOx concentration in the exhaust gas was measured under loads of 75%, 50%, and 25%. The results show a remarkable decrease in NOx to a value less than 1.9 g/kWh which represents an 80% reduction compared to normal operating conditions.

Development of a Nitrogen-enrichment/Humidification Membrane System for NOx Emission Reduction in a Marine Diesel Engine