Finland’s Wärtsilä and England’s Rolls-Royce, technology providers for marine engines, are separately shifting focus from CO2 emissions to concentrate on reduction of methane emissions from LNG engines for shipping. According to an LNG GOT report, which refers to Norwegian journal “Teknisk Ukeblad’, 2012 will see Wärtsilä ready with a new generation of LNG engines in which methane emissions are greatly reduced. “No one focused on methane emissions earlier. It was enough to try to reduce the NOx. Now the focus is directed at reducing methane emissions,” said sales manager John Martinsen, Wärtsilä Ship Power in Norway to Teknisk Ukeblad.
The new LNG engines will reduce methane emissions by up to 70%. Emissions would be reduced from 20 grams of methane per kilowatt-hour to 6 grams per kilowatt hour. Since soo2, Wärtsilä has delivered about 280 engines for LNG carriers, and will focus on getting the new and more environmentally friendly model out 2012th.
Rolls-Royce’s next generation of lean-burn LNG engines will also reduce emissions significantly – 4 grams of methane per kilowatt, a reduction of 50%. “The first edition of LNG engines were very good at reducing emissions of NOx, SOx and harmful particles. But the climate profile was destroyed by the fact that there was unburned gas released that contained the greenhouse gas methane,” says Sales Director Odd Magne Horgen from Rolls-Royce to Teknisk Ukeblad.
Rolls-Royce has improved cylinder, cylinder head and valve systems to prevent release of unburned methane, but has not released details of the technology.