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lutions, commented: “We initiated this ME-GA project in of pilot oil, combustion occurs, and the piston moves down- late 2017 when we recognized a strong market desire for a wards, completing the cycle. An engine-mounted Gas Regu- lower-cost alternative to the ME-GI engine, driven primarily lating Unit (GRU) enables depressurization of the system and by the LNG carrier market. Crucially, this new supplement to the nitrogen purge block mounted at the aft of the engine en- our dual-fuel portfolio continues our mission to decarbonize ables purging without dedicated blow-off piping.

shipping and further the maritime energy transition to sus- MAN Energy Solutions has included its proprietary EGR tainable fuels.” (Exhaust Gas Recirculation) system as an emissions solution

MAN Energy Solutions’ portfolio of two-stroke, dual-fuel for the new engine. EGR is a NOx emissions reduction tech- engines has accumulated over 1.6 million operating hours nique that ensures IMO Tier III compliance in both diesel from the 155 engines (6.3 GW) currently in service, all run- and gas mode. The EGR system will enable the ME-GA to ning on clean fuels such as LNG, LPG, ethane and methanol. reduce speci? c gas consumption by about 3%, and speci? c

With fuel prices and availability currently in ? ux, the com- fuel-oil consumption by 5% and will also signi? cantly reduce pany expects the option of retro? tting to dual-fuel engines to methane slip by 30 to 50% as well as solve the issue related increasingly become a necessity. to pre-ignition on Otto-cycle engines.

Other design concepts of the ME-GA engine include a

Pre-mix Otto cycle Ops with Exhaust Gas Recirculation G70ME-C10.5-GA cylinder condition with a ring package

The MAN B&W ME-GA dual-fuel engine works on a pre- that ensures even pressure distribution and minimum deposit mixed Otto cycle combustion principle in which scavenging build-up in the ring grooves, while also providing signi? cant- air is let into the cylinder as the piston reaches bottom dead ly more robustness against ring collapse.

center (BDC) followed by gas being admitted as the piston MAN Energy Solutions aims to start testing the ? rst, com- moves upwards in the cylinder liner. mercial ME-GA design by the end of this year, with the ? rst

The pre-mixed air-fuel mixture is then ignited by means engine delivery following in early 2022.

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