Daewoo Shipbuilding & Marine Engineering has developed an HP-FGS (high-pressure fuelled gas supply) system for MAN Diesel & Turbo’s ME-GI engine. The company says that though there are small and medium sized liquefied natural gas (LNG)-fuelled vessels already, this is the first dual-fuel two-stroke engine for large commercial vessels which form the majority of the shipping industry. The HP-FGS system effectively supplies highly-pressurised (about 300 bar) natural gas fuel to an engine; DSME says that it should opened a new era for LNG fueled ship propulsion.
DSME says there are existing FGS systems for compressing gas to a high pressure, which require enormous amounts of electricity and large deck area to accommodate the size of this equipment. However, the DSME HP-FGS system compresses LNG and vaporises it into gas form. With this method, this system can supply gas at about 300 bar using low electric power, typically about 100kW for the same amount gas supply, compared to existing similar products. It also is compact enough to be mounted on the ship.
DSME points out that the MAN ME-GI engine was originally developed in 1994 for power plants. It was not previously considered suitable for marine use because of the lack of a high efficiency, high pressure gas supply system.
The company expects its first contract for an LNG fueled vessel soon. Additionally, it has been predicted that LNG-fueled propulsion systems will be also be adapted for use in other commercial vessels such as container ships, crude oil carriers, and so on.
Due to the framework created by the convention on climate change DSME says that many industries will start to move from traditional fossil fuels to clean energy. In shipping, large LNG-fueled vessels will bring about a revolutionary change. LNG is the next-generation fuel that is both economically feasible and eco-friendly. This high pressurised gas powered engine emits significantly fewer pollutants than those using petrol or diesel, decreasing CO₂ emissions by over 23%, and SOx emissions by over 95%. It is also economical. The price per thermal unit ($/million BTU) for LNG has been historically cheaper than that of Bunker-C oil or marine gas oil(MGO). Experts generally expect this trend to continue into the near future.
This article compiled using information from a DSME press release.