Yesterday's full-scale demonstration and performance verification test of the GI principle for all kinds of marine applications was carried out on MAN Diesel & Turbo's 4T50ME-X R&D research engine, which has been rebuilt as a 4T50ME-GI engine operating on natural gas. Korea's Daewoo Shipbuilding & Marine Engineering Co., Ltd. (DSME) has provided the ME-GI's high-pressure, cryogenic gas-supply system according to the terms of a development agreement signed in February 2010.
The ME-GI engine is a gas-injection, dual-fuel, low-speed diesel engine that, when acting as main propulsion in LNG carriers or any other type of merchant marine vessel, can burn gas or fuel-oil at any ratio, depending on the energy source available on board and dictated by relative cost and owner preference
Depending on relative price and availability, as well as environmental considerations, the ME-GI engine gives shipowners and operators the option of using either gas or HFO.
MAN Diesel & Turbo sees significant opportunities arising for gas-fueled tonnage as fuel prices rise and modern exhaust-emission limits tighten. Indeed, previous research indicates that the ME-GI engine, when combined with exhaust gas recirculation (EGR) and waste-heat recovery (WHR) technologies, delivers significant reductions in CO2, NOx and SO x emissions fulfilling Tier-II and Tier-III regulations
MAN Diesel & Turbo predicts a broad, potential market for its ME-GI engine, extending from LNG and LPG carriers to other oceangoing vessel segments such as containerships as well as ships plying a fixed trade. As such, the ME-GI engine represents a highly efficient, flexible, propulsion-plant solution.
Considered timing "The unveiling of the ME-GI engine is MAN Diesel & Turbo's response to current market conditions and the large audience in Copenhagen is proof of the great interest in this propulsion solution," said MAN Diesel & Turbo's Søren H. Jensen, Vice President and Head of Research & Development, Marine Low-Speed
He continued: "The ME-GI engine is the culmination of years of research and development and we consider the timing of its release to market to be optimal. We see many potential applications for the ME-GI's increased flexibility and greater control both within the LNG sector and generally within marine transportation, as operators seek to control costs and emissions."
Jensen concluded: "With the addition of the ME-GI engine to its existing portfolio, MAN Diesel & Turbo now offers the two-stroke market's most comprehensive array of prime-mover solutions all the way up to 98-bore."
Technical details MAN B&W ME-GI (Gas Injection) two-stroke engines possess economical and operational benefits compared to other, low-speed engine plants, irrespective of ship size. Based on the successful, electronically controlled ME heavy-fuel-burning diesel engines, the ME-GI design accommodates natural gas and liquid fuels.
Dual-fuel operation requires the injection of both pilot fuel-oil and gas fuel into the engine's combustion chamber via different types of valves arranged in the cylinder head. The ME-GI engine head is fitted with two valves for gas injection and two for pilot fuel. The pilot-oil valve is a standard ME fuel-oil valve.
MAN B&W ME-C and ME-GI engines are broadly similar and share the same efficiency, output and dimensions. In comparison, the ME-GI engine's key components are its modified exhaust receiver, modified cylinder cover with gas-injection valves and gas-control block, an expanding top gallery platform, high-pressure fuel-supply pipes, and mounted gas-control units.
The ME-GI engine offers inherent benefits that include:
- low operational cost
- low investment cost
- flexible burning of HFO and gas
- clean exhaust gas
- conventional MAN B&W two-stroke technology:
- high reliability
- low maintenance
- simple technology
- maximum engine-room safety
- two-stroke dual-fuel experience since 1994
- proven technology.
- May 20, 2011