Mitsui O.S.K. Lines, Ltd. (MOL) plans to install a selective catalytic Reduction (SCR) system—jointly developed by MOL, Yanmar Co., Ltd., and Namura Shipbuilding Co., Ltd.—on all three power generators of an MOL-operated oceangoing freighter for a demonstration test. This test demonstrates NOx aftertreatment under the actual operation of freighter to meet the Tier III NOx regulations set by the International Maritime Organization (IMO).
The SCR system received a statement of fact from ship classification society Nippon Kaiji Kyokai (ClassNK) on 1 July, verifying that it meets the NOx Tier III emission limit. The system was developed with support from ClassNK’s “Joint R&D with Industries and Academic Partners” program.
The test operation is scheduled to last about two years, to observe operability and refilling of aqueous urea, and ensure that all three SCR systems function properly under normal power generator operating conditions and that long-term performance of the system can be maintained even if the engines use Bunker C and other fuels that contain high levels of impurities.
The International Convention for the Prevention of Pollution from ships, MARPOL Annex VI regulates NOx emissions from vessels. The diesel engines used on vessels built after 2016 will be required to reduce NOx emissions by more than 80% from the Tier I NOx emission standards in the Emission Control Areas, including North America.