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MAN B&W DEMONSTRATES DUAL-FUEL TWO-STROKE ENGINE WITH EGR

MAN B&W DEMONSTRATES DUAL-FUEL TWO-STROKE ENGINE WITH EGR

Friday, March 19, 2021 

MAN Energy Solutions has demonstrated its latest low-speed, dual-fuel engine an MAN B&W ME-GA type designed for LNG/fuel-oil running during a ceremony at its Copenhagen Research Centre.

The new engine is an Otto-cycle variant of the company’s successful ME-GI engine, using a low pressure gas system rather than the standard ME-GI high pressure system. As its pre-mixed combustion results in low NOx emissions, the ME-GA engine is inherently Tier II and Tier III compliant in gas-operation mode. To fully utilise its dual-fuel potential in Tier III areas, the engine is being offered with Exhaust Gas Recirculation (EGR).

Wayne Jones, Chief Sales Officer, MAN Energy Solutions, said: “Our development of new technologies is directly influenced by the close relationships we have with our customers. We initiated this ME-GA project in late 2017 when we recognised a strong market desire for a lower-cost alternative to the ME-GI engine, driven primarily by the LNG carrier market. Crucially, this new supplement to our dual-fuel portfolio continues our mission to decarbonise shipping and further the maritime energy transition to sustainable fuels.”

MAN Energy Solutions aims to start testing the first, commercial ME-GA design by the end of this year, with the first engine delivery following in early 2022.

Bjarne Foldager, SVP and Head of Two-Stroke Business, said: “It’s taken a team of 150 colleagues, and hundreds of tests and operational hours, to get the engine to this important stage. In doing so, we have drawn on the invaluable experience gained from developing our successful ME-GI concept. Similarly, our proprietary EGR system also plays an important role in the ME-GA set-up. Not only does it deliver NOx-compliance, it also helps maintain control of the ignition process and reduces fuel consumption by 3 and 5% in gas and fuel-oil modes, respectively. This is just the latest milestone in the dual-fuel strategy we have followed over the past decade, and further confirms our leadership in this critical marine segment. Our dual-fuel engines continue to act as standard bearers for environmentally friendly, reliable propulsion-technology with their seamless switching between fuels. Ultimately, we expect the ME-GA to become standard among LNG carriers.”

MAN Energy Solutions reports that its portfolio of two-stroke, dual-fuel engines has accumulated over 1.6 million operating hours from the 155 engines (6.3 GW) currently in service – all running on clean fuels such as LNG, LPG, ethane and methanol. With fuel prices and availability currently in flux, MAN Energy Solutions expects the option of retrofitting to dual-fuel engines increasingly to become a necessity.

In November 2020, MAN Energy Solutions announced that it would offer its proprietary EGR (Exhaust Gas Recirculation) system as an emissions solution for the ME-GA, to ensure IMO Tier III-compliance in diesel mode. The company reports that EGR will enable the ME-GA to reduce specific gas consumption by ~3%, and specific fuel-oil consumption by 5%. It will also significantly reduce methane slip by 30% to 50%, and improve the stability of the Otto-cycle combustion process. EGR will enable the ME-GA to meet Tier III requirements in both fuel oil and gas modes without additional aftertreatment. The ME-GA EGR solution is a high-pressure system, which can be integrated into existing engine-room designs, and the EGR unit itself does not change the engine footprint. Its design-similarity to that of ME-C engines’ EGR systems will lower its price point, since the supply chain and components are already matured. The volume requirements of the ME-GA EGR system are also significantly lower with, for example, less pipework required than for low-pressure EGR solutions.

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