The Wärtsilä 31DF dual-fuel engine, used by cruise ship operators, is being upgraded to increase its power output.
The higher power output will be available within the same dimensions, thereby delivering greater performance within the same physical footprint.
At the same time, the low level of exhaust gas emissions is being improved to further heighten the engine’s sustainability factor, Wärtsilä said.
It was introduced in 2015 and was recognised by Guinness World Records as being the world’s most efficient 4-stroke diesel engine.
The fuel flexible DF version, capable of burning natural gas, marine light fuel oil, as well as heavy fuel oil, has proven to be increasingly popular for installation on a broad range of vessel types, including cruise ships and ferries.
The power upgrade will result in the current output range of 4.2 to 11 MW being increased to 4.6 to 12 MW with 600 kW/cylinder at 750 rev/min, and 580 kW/cylinder at 720 rev/min.
This also lowers the level of greenhouse gas emissions whereby a typical ferry can reduce its emissions by as much as 750 tonnes per annum, corresponding to the average output from 163 cars.
“This power upgrade to the Wärtsilä 31DF represents significant added value to our customers,” said Janne Klemola, General Manager, Product Management Small and Medium bore, Wärtsilä Marine. “Getting more power from an engine that already delivers exceptional efficiency, low emissions, and fuel flexibility is a real benefit.
“Regardless of whether the engine is installed on ships for propulsion or in land-based power plants for electricity generation, achieving this upgrade with fewer cylinders lowers the lifecycle costs, while at the same time reducing both the installation and maintenance costs,” Klemola said.
Since its introduction, more than 100 Wärtsilä 31 engines have been sold, and in excess of 60,000 field operating hours have been accumulated.
“Sustainable power production is at the heart of Wärtsilä’s product development strategy, and with all sectors of the global economy looking for ways to combat climate change, optimising efficiency and lowering emissions is of critical importance.
“Internal combustion engines will play a crucial role in balancing the future energy mix, and hence we are focusing strongly on continuously developing our engines to achieve better power generation performance, greater cost-efficiency, and to accept new fuels. Powering up the W31DF is one good example,” added Jukka Lehtonen, Vice President, Technology & Product Management, Wärtsilä Energy.