Wärtsilä 20DF

The advantages of fuel flexibility in a small unit, also used for generating set applications

With the Wärtsilä 20DF, Wärtsilä is extending the benefits of dual fuel (DF) technology to cover the entire power range. The engine offers ship owners and operators a compact unit that brings all the advantages of fuel flexibility to auxiliary applications, such as generating sets or as the prime mover in smaller vessels.

Based on the well proven and reliable Wärtsilä 20 diesel engine introduced in the early 1990s, fuel flexibility means the engine can be optimized for constant speed generating sets, as well as variable speed mechanical drives, for main engine applications.

    Advantages

    Fuel flexibility

    The Wärtsilä dual fuel engine capability enables ships to be operated on either conventional liquid marine fuels (LFO, HFO or liquid bio fuel) or LNG. The switch between fuels can be made seamlessly without loss of power or speed. Such fuel flexibility enables compliance with emission regulations in controlled areas, while giving operators the option of determining the fuel according to cost and availability.

    When operating in gas mode, the Wärtsilä 20DF engine is already compliant with IMO Tier III regulations without any secondary exhaust gas purification systems. Also, when fuelled by gas, the 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 emissions regulations set out in Annex VI of the MARPOL 73/78 convention. The engine is able to operate efficiently and economically on low sulphur fuels (<0.1% S), making it suitable for operation in emission-controlled areas.

    Technical data
    Wärtsilä 20DF IMO Tier III
    Cylinder bore 200mm Fuel specification:
    Piston stroke 280 mm Fuel oil 700 cSt/50°C
    Cylinder output 185 kW/cyl 7200 sR1/100°F
    Speed 1200rpm ISO 8217, category ISO-F-DMX, DMA & DMB
    Mean effective pressure 21.0 bar BSEC 8040 kJ/kWh at ISO cond.
    BSGC 7850 kJ/kWh at ISO cond.
    Piston speed 11.2m/s

    Dimensions (mm) and weights (tonnes)
    Engine type A* A B C D F Weight
    6L20DF 3 254 3 108 1 705 1 690 1 800 624 9.4
    8L20DF 3 973 3 783 1 705 1 824 1 800 624 11.1
    9L20DF 4 261 4 076 1 705 1 824 1 800 624 11.7

     20DF

    Rated power
    Engine type kW
    6L20DF 1 110
    8L20DF 1 480
    9L20DF 1 665

    Applications

    Installed alongside Wärtsilä 34DF, 46DF or 50DF main propulsion machinery, a Wärtsilä 20DF generating set completes the multi-fuel engine room concept. Compact and light, the Wärtsilä 20DF is intended for use in those vessel types where the Wärtsilä 20 is currently installed.

    As well as being an ideal mechanical-drive prime mover in smaller applications, such as small cargo vessels, ferries or tug boats, it is also an excellent choice for harbour generating set applications in a wide range of vessel types.

    Related references

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