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MARINE HYBRID SOLUTIONS


LNG fuel tank is placed on the rear deck of the ship and is a removable structure, which improves convenience during fuel supply and maintenance inspection. In evaluation of this series of environmental improvements, it has received the highest rating of four stars in the “Energy Conservation Rating System for Costal Ships”, certified by the Ministry of Land, Infrastructure, Transport and Tourism. Over the 10 years since MOL launched this project it has widely shared its concept of shipping that incorporates environmental considerations and safety compliance, and the company proudly holds that “Ishin” is the embodiment of this project.


A Dual Fuel Engine That Significantly Cleared Exhaust Gas Regulations


From January 2020, environmental regulations on ship fuels became stricter, with regulations on the sulfur content of ship fuels tightening, in all sea areas around the world. Yanmar focused on LNG, which has excellent environmental performance, and has been used in existing diesel engines since 2012 as a dual fuel engine (dual fuel engine) that can operate in both a gas mode with LNG fuel and a diesel mode with diesel fuel. Research and development commenced, based on the 6EY26 engine, and proceeded to commercialization by April 2016. A dual fuel engine that uses two types of fuel, LNG and diesel, requires advanced


control technology. High-precision air flow control technology was introduced into the 6EY26DF, and by maintaining the engine in the optimum combustion state at all times, high reliability was achieved, and stable operation made possible. In the gas mode, NOx is reduced by about 80%, SOx, PM is reduced by about 99%, and CO2 is reduced by about 25% when compared with the exhaust of Yanmar's IMO secondary regulation compliant diesel engine. the gas mode also clears the IMO tertiary regulation for NOx reduction.


EY26DF Dual Fuel Engine Features


• Fuel Flexibility – Switch between LNG and diesel fuel mode even under full engine loads;


• No power limitations even for LNG with a low methane concentration;


• Attractive means of addressing fluctuating fuel costs.


6EY26DF Main Specifications Engine model


Output No. of cylinders


Advanced Engine Control


• Stability in gas mode utilizing YANMAR’s innovative technology to control the air-fuel ratio together with knock detection system;


• Effective ignition in gas mode similar to diesel with the micropilot injection system.


Cleaner Operation and Greater Thermal Efficiency in Gas Mode


• 84% NOx, 25% CO2, and 99% Sox and PM reductions compared to the same-class EY26 diesel engine; meeting IMO Tier 3 standards;


• Gas mode exceeds YANMAR’s current diesel engine thermal efficiency ratios at 46.8%;


• Optimum combustion for stable and highly reliable operation.


6EY26DF 1618KW 6


Cylinder bore x stroke 260mm × 385mm Displacement Engine speed Fuel


122.6L 750/min


Natural gas/M.D.O/[H.F.O] February 2021 www.dockyard-mag.com 41


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