January 12, 2004
MAN B&W introduces new LNG ship diesel
MAN B&W Diesel A/S has introduced a version of its electronically-controlled ME two stroke engine designed specifically for LNG carriers.
The ME-GI engine design builds on experience gained from the earlier MC-GI engines combined with the developments in the latest electronically controlled ME engines.
Traditionally, LNG carriers have been powered by steam turbines that are fed from boilers fired by the boil off gas, supported by heavy fuel oil. However, after careful consideration of the various alternatives for LNG carrier propulsion, the conclusion from MAN B&W is that a two-stroke engine solution is the best solution.
The dual fuel ME-GI features an additional reliquefaction plant, allowing sale of more gas when the gas price is higher than the fuel oil price.
MAN B&W Diesel's VP Two-Stroke Sales, Ole Grone, says the company sees "many new opportunities" in the LNG carrier market area for "cost-down solutions permitted by the increased flexibility and greater control with the ME-GI engine.'
"Among the many proposals and ideas for LNG carrier propulsion," says Grone, "the ME-GI, also installed with reliquefaction technology, where preferred, provides the best solution for the future needs of the LNG transportation market."
Responding to an LNG carrier market demand for more efficient engines, while retaining the option to burn the boil off gas, MAN B&W is therefore reintroducing its high pressure gas injection low speed diesels--this time in an electronically controlled version.
Designated ME-GI, this gas burning option is being offered in parallel to the heavy fuel-burning solution with gas reliquefaction.
The combination of the ME-GI engine, installed with a reliquefaction plant, allows owners and operators the choice of either using the boil off gas in the engine or of reliquefing the gas and using HFO instead. The will be dependent on the relative prices and availability of gas and HFO as well as environmental considerations.
Thermal efficiencies far exceed the 30% offered by steam turbines and any other combination alternatives, says MAN B&W.
The ME-GI dual fuel enhanced engine control and monitoring systems enable the latest ME technical developments to be applied to LNG carriers. The precise timing and combustion rate shaping gained through the use of the electronic control of injection and exhaust valves produce greater control at any load.
The ME-GI dual fuel engine builds on the experience gained from the MC-GI dual fuel engine. A 12K80MC-GI-S engine has been in operation in the Chiba power plant (Japan) since the Summer of 1994. The reliquefaction technology that is proposed as an additional feature to allow the sale of more gas is state-of-the-art technology. It is well known in the process industry and is derived from the numerous reliquefaction units installed on LPG ships.
The ME engine range has proved to be very successful since its introduction. The first ME engine was put into service on the 37,500 dwt chemical tanker M/T Bow Cecil (Odfjell,Norway). This engine, a 6L60MC/ME, has performed as desired for more than 16,000 hours.
The ME range of engines is available from the 4S50ME-C through to the world's most powerful ME engine, the 14K108ME-C.