Dual fuel engine developed for fuel flexibility

24 Mar 2014
The Wärtsilä 46DF engine

The Wärtsilä 46DF engine

Wärtsilä has added another dual fuel four-stroke engine, the 46DF, to its marine portfolio, a move which the company claims has “once again raised the technology bar in the dual-fuel engine market.”

At the same time, Wärtsilä says it has strengthened its offering in the medium-speed engine sector. The 46DF has been designed and developed to offer maximum fuel flexibility for the high-output market segment, including cruise ships and ferries, merchant vessels, LNG carriers and in the offshore market, for applications such as FSRUs (floating storage and regasification units), offshore vessels and platforms.

It is capable of operating on natural gas, HFO, or MDO, a flexibility which the company says 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," said Lars Anderson, vive-president four-stroke sales, Wärtsilä Ship Power.

Two versions of the46DF have been introduced, to meet specific customer needs. The high efficiency version offers significantly lower fuel consumption with a cylinder power of 1,045kW, while the high power version is capable of a cylinder power of 1,145kW while maintaining high engine thermal efficiency. For LNG carrier applications, the 46DF is said to offer fuel savings of as much as 20t/day compared to the first introduced DF engines. With up to 14 fewer cylinders installed, the overall lifecycle installation costs are said to be positively impacted by roughly US$1,000/day.

When operating in gas mode, the Wärtsilä 46DF engine is compliant with IMO Tier III regulations without secondary exhaust gas purification systems. When fuelled by gas, the sulphur oxide (SOx) and carbon dioxide (CO2) emissions are notably reduced, and smokeless operation is attained. In liquid fuel oil mode, the engines are compliant with IMO Tier II exhaust emission regulations as set out in Annex VI of the MARPOL 73/78 convention.

The company says that more than 1,000 of its dual-fuel engines have been sold globally, a record that it hopes to build further upon with this new engine introduction. 

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