The low-pressure MAN B&W ME-GA engine, a 2nd generation Otto cycle engine
The MAN B&W ME-GA two-stroke dual-fuel LNG engine delivers a low CAPEX solution that is the perfect choice for certain LNG carrier designs. Based on the well-proven MAN B&W dual-fuel design with minimal installation requirements, the MAN B&W ME-GA uses an efficient ignition concept and a unique gas admission system that delivers safe and reliable operation at the lowest possible cost, while allowing an easy integration into most modern contemporary LNG carrier designs.
The engine benefits among others from a proven and cost efficient Exhaust Gas Recirculation (EGR) design for significantly lower NOx, CO2 and GHG emissions.
In addition to the advantages of using "boil-off" gas from LNG carriers, the MAN B&W ME-GA is exceptionally cost-efficient in other ways, for example with minimal installation and operational costs, simple supply and purging concepts and low maintenance costs of the fuel-gas supply system, which in combination with the cost effective and proven EGR design, put the ME-GA engine in a very strong position compared to other two-stroke low-pressure LNG engines.Well-known engine room design accommodates simple installation, and the distinctive features from the well known ME-GI platform enables you to take advantage of crews existing ME-GI know how
Next generation performance and efficiency
- Minimal installation and optimized performance
- Well-known engine room design similar to ME-C and ME-GI
- Proven EGR design for significantly lower NOx, CO2 and GHG emissions
- Minimised installation costs
- Unique gas admission system enabling safe and reliable operation,
at lowest possible costs
- Robust piston ring package with three piston rings and uniform pressure drop
- Simple pilot fuel system that can burn VLSFO/MGO
- Worldwide service network providing maximum availability
ME-GA - The latest dual-fuel MAN B&W two-stroke engine
The ME-GA engine design concept is the premixed Otto principle, and the efficient performance of the engine is the result of an in-house developed exhaust gas recirculation (EGR) solution. The high-pressure EGR solution has been optimised for the ME-GA engine with performance-enhancing results, which include high performance efficiency, significantly reduced methane slip, and Tier III compliance when operating on conventional fuel oils. Moreover, the development of the ME-GA engine solution, which requires only a low-pressure fuel supply, has been performed with focus on reducing capex for the LNG carrier segment. This paper introduces the unique on-engine gas admission system, and discusses the new engine optimisation achieved with the proven EGR system. The first ME-GA engine available in our engine programme is a 70-bore engine aimed at the LNG carrier segment.
World-First ME-GA Engine Demonstration
MAN Energy Solutions has has demonstrated its latest low-speed, dual-fuel engine – an MAN B&W ME-GA type designed for LNG/fuel-oil running – at a ceremony live-streamed from its Copenhagen Research Centre today. The new engine is an Otto-cycle variant of the company’s successful ME-GI engine.
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 OBE, Chief Sales Officer, MAN Energy Solutions, participated in the event, which was hosted by Bjarne Foldager, Senior Vice President and Head of Two-Stroke Business, and Thomas S. Hansen, Head of Two-Stroke Promotion and Customer Support.
Jones 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.
Foldager 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.”
He added: “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 to increasingly become a necessity.
The high-efficiency MAN B&W ME-GA engine delivers a low CAPEX solution aimed at certain vessel types and applications, such as LNG carriers, that are able to use ‘boil-off’ gas as a source of fuel. It will also be of appeal to smaller vessels where low capital outlay is a priority.
Based on the well-proven MAN B&W dual-fuel design with minimal installation requirements, the MAN B&W ME-GA uses an efficient ignition concept and unique gas-admission system that delivers safe and reliable operation.
The ME-GA furthermore features minimal operational costs, simple supply and purging concepts, and low maintenance costs for its fuel-gas supply system. With Tier III compliance in gas mode, the engine meets all current and upcoming NOx emission regulations with the addition of EGR.
Already 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. EGR is a NOx-emissions-reduction technique that ensures IMO Tier III-compliance in diesel mode for the ME-GA.
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.
The Maritime Energy Transition
MAN Energy Solutions believes that it is time for what it terms a ‘Maritime Energy Transition’ to find clean, decarbonised solutions for seaborne trade and transportation. Essentially, it is the company’s call to action to reduce emissions and establish natural gases as the fuels of choice in global shipping. It strongly promotes a global ‘turn to gas’, driven by the IMO, and a common approach by the shipping industry and politics to invest in infrastructure development and retrofits.
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