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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. 

Best-in-class CAPEX

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
MAN B&W ME-GA
More than
220
engines ordered since March 2021
up to
50
%
reduction of methane slip with proven EGR design

Next generation performance and efficiency

MAN-ME-GI-engine-Key-features
  • 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.

Related news

Wednesday, February 23, 2022

ME-GA Quick to Notch 100 Orders

MAN Energy Solutions’ second-generation, Otto-cycle ME-GA engines taking over LNG carrier market with advantages in emissions and performance that establish new standard

MAN Energy Solutions has announced that its MAN B&W ME-GA engine – the latest addition to its dual-fuel portfolio – has already won 100 orders since May 2021. Simultaneously, the company revealed that the first ME-GA-powered LNG carrier will enter service in the summer of 2023. 

Bjarne Foldager, Senior Vice President and Head of Two-Stroke Business, MAN Energy Solutions, said: “The speed with which the ME-GA has reached this milestone is testament to its broad acceptance by oil majors, charterers, ship yards, ship designers and ship owners as the industry’s preferred, second-generation, Otto-cycle engine for LNG carriers. This achievement adds to the strong foundation and proven track record that MAN Energy Solutions already has for bringing new technologies to the market.”    

Each ME-GA engine comes equipped with Exhaust Gas Reduction (EGR) that reduces methane-slip emissions by up to 50%, compared to first-generation, Otto-cycle engines without EGR. The increased focus on methane-slip reduction – as well as other operational/technical benefits – has essentially established EGR as a new standard in contemporary, LNG carrier designs with Otto-cycle engines.

EGR enables the significant reduction of methane slip, while simultaneously improving fuel efficiency in both gas and fuel-oil operation. Ultimately, EGR actively reduces emissions and improves efficiency in both Tier II and Tier III.

MAN Energy Solutions’ proprietary EGR system began development more than a decade ago and was applied to a commercial project for the first time in 2013. Initially focused on achieving NOx Tier III compliance, the system has since matured into a robust, engine-tuning tool that today has accumulated orders for more than 275 engines.

Thomas S. Hansen, Head of Promotion and Customer Support, MAN Energy Solutions, said: “The ME-GA is just the latest in a series of initiatives MAN Energy Solutions has introduced to decarbonise shipping and further the maritime energy transition to sustainable fuels. Our dual-fuel engines are based on mature technology, and our ME-GA and ME-GI LNG-fueled engines set the standard for environmentally-friendly, reliable propulsion with seamless switching between fuels.”

About ME-GA

 

The 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. 
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. It joins the well-established ME-GI Diesel-cycle engine in MAN Energy Solutions’ two-stroke-engine portfolio, which now offers both low- and high-pressure, dual-fuel solutions for operation on LNG.

About Exhaust Gas Reduction

 

In November 2020, MAN Energy Solutions announced that it would offer its proprietary EGR system as an emissions solution for the ME-GA. EGR is a NOx-emissions-reduction technique that, beyond emission and performance benefits, also 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 up 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 an engine-integrated design that interacts with the exhaust gas before the turbocharger, and can be integrated into existing engine-room designs since 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.

Due to its performance and environmental benefits, each ME-GA engine comes with EGR as standard.

 

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Nils Søholt

Trade Press Marine

Group Communications & MarktingMAN Energy SolutionsTeglholmsgade 412450 Copenhagen SVDenmark

t +45 33 85 26 69

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