MARCH 24, 2014 — Wärtsilä has introduced the new Wärtsilä 46DF, extending its dual fuel engine line by covering the power range from 6.2 MW to 18.3 MW at 600 rpm.
The fuel flexible Wärtsilä 46DF engine has been specifically developed for the high-output market segment, including cruise ships and ferries, merchant vessels, LNG carriers and FSRUs (Floating Storage and Regasification Unit), and offshore vessels and platforms, and is capable of operating on natural gas, heavy fuel oil, or marine diesel oil. This fuel flexibility enables reduced operational expenses, compliance with the most stringent emission standards, and full redundancy to ensure uninterrupted operation.
"With this newly launched product, Wärtsilä has raised the industry standard even higher, since it offers simultaneously drastically lower specific fuel consumption, both in gas and diesel fuel mode, remarkably higher output, and extremely attractive lifecycle costs compared to any other alternative currently available on the market," says Lars Anderson, Vice President 4-stroke Sales, Wärtsilä Ship Power.
The engine is available in two different versions to meet specific customer needs. The high efficiency version offers what Wärtsilä describes as "drastically lower fuel consumption" with a cylinder power of 1,045kW, while the high power version is capable of a cylinder power of 1,145kW with excellent engine thermal efficiency.
For LNG carrier applications, says Wärtsilä, the 46DF can offer fuel savings of as much as 20 tons/day compared to earlier DF engines. With up to 14 fewer cylinders installed, the overall lifecycle installation costs are significantly and positively impacted by roughly $1,000 per day.
Operating in gas mode, the Wärtsilä 46DF engine is already compliant with IMO Tier III regulations without any secondary exhaust gas purification systems, SOx and CO2 emissions are notably reduced, and smokeless operation is attained. In liquid fuel oil mode, the Wärtsilä dual-fuel engines are fully compliant with the IMO Tier II exhaust emission regulations set out in Annex VI of the MARPOL 73/78 convention.
The Wärtsilä 46DF design is based on the well proven Wärtsilä 46F and Wärtsilä 50DF engine families.
Cylinder bore 460 mm
Piston stroke 580 mm
Cylinder output 1,045/1,145 kW/cyl
Engine speed 600 rpm
Mean effective pressure 21.7, 23.8 bar