New fuel-flexible dual fuel and small-bore four-strokes launched

Wärtsilä’s latest dual-fuel engine, the fuel-flexible 46DF Wärtsilä’s latest dual-fuel engine, the fuel-flexible 46DF
Industry Database

Wartsila has added a new dual fuel engine, claimed to offer lowest fuel consumption, high output and attractive lifecycle costs, to its portfolio which was recently enhanced by two smaller four-strokes aimed principally at the genset market.

With the introduction of its new Wärtsilä 46DF engine, Wärtsilä, says that it has strengthened its offering in the medium-speed engine sector, while raising the bar in dual fuel technology. The engine has been specifically developed for the high-output market segment, including cruise ships and ferries, merchant vessels, LNG carriers and FSRUs, and offshore vessels and platforms. Fuel flexibility is a major claimed benefit, being capable of operating on natural gas, heavy fuel oil, or marine diesel oil. The company says that 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,” said Lars Anderson, vice president four-stroke sales, Wärtsilä Ship Power.

The Wärtsilä 46DF is offered to the market in two different versions to meet specific customer needs. The high efficiency version offers significantly lower fuel consumption with a power of 1,045kW/cylinder, while the high power version is rated at 1,145kW/cylinder with high engine thermal efficiency. For LNG carrier applications, the 46DF claims possible fuel savings of as much as 20t/day compared to the earlier generation of DF engines. The company says that because equivalent power can be achieved with up to 14 fewer cylinders installed, overall lifecycle installation costs could be reduced by roughly US$1,000/day.

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

At the end of 2013, Wartsila introduced two new members to its four-stroke family, notable for being manufactured in its Chinese joint venture factories, and both intended to provide auxiliary electrical power onboard all types and sizes of ships.

The Auxpac 16 is a completely new engine design, while the Auxpac 32 is based on the established W32 design. Both are urbocharged four-stroke engines with direct fuel injection and charge air cooling and are supplied as pre-engineered gensets.

Being based upon established technology, namely the Auxpac 20 and 26 engines, some 1,000 examples of which have accumulated over 6 million running hours, the Auxpac 16 and 32 are claimed to offer a high level of reliability alongside compliance with IMO Tier II environmental regulations. Tier III compliance can be achieved with the addition of an exhaust gas treatment system.

The Wärtsilä Auxpac 16 is designed for merchant vessels, such as bulkers, tankers and smaller container vessels, with installed auxiliary power in the 500kWe to 750kWe per generating set range. It was developed in co-operation with the Shanghai Marine Diesel Engine Research Institute (SMDERI) in China. The Auxpac 16 development project began in spring 2011, using the engineering experience and basic design of the successful Auxpac 20. The engine will be produced at the Wärtsilä Qiyao Diesel Company (WQDC) joint-venture company in China.

The new engines are said to be important steps in Wärtsilä’s strategy for increasing its share of the auxiliary engine market. The involvement of the Asian joint-venture companies has played an important role in making these developments possible.

“These latest additions to our engine portfolio will help us to serve an even broader market, and it is important that they are being manufactured in China - close to our Asian customer base. The new engines are competitive and have outstanding performance for the markets they serve. Furthermore, our customers have the unique Wärtsilä worldwide service network to rely on. We expect our auxiliary engine sales to develop quickly,” said Mr Anderson.

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