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Wärtsilä dual-fuel engines - 4 Pages

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Catalogue excerpts

The Wärtsilä dual-fuel engine is the ultimate ‘fuel flexibility’ solution. It is a four-stroke engine that runs on light fuel oil (LFO) or heavy fuel oil (HFO), and can switch over from gas to LFO/HFO and vice versa smoothly during engine operation. The Wärtsilä dual-fuel engines are available in power range from 0.8–17.5 MW having speed range from 500–1200 rpm. KEY BENEFITS OF WÄRTSILÄ DF-ENGINES: • Fuel flexibility • Application flexibility • Proven and reliable dual-fuel technology • Long overhaul intervals • Low exhaust gas emissions • Fuel economy over the entire engine • operation range • Low gas feed pressure • Embedded automation system DUAL-FUEL ENGINES – WÄRTSILÄ 20DF, TECHNOLOGY AND OPERATION ADVANTAGES The Wärtsilä dual-fuel engines are fourstroke power converters that can be run on natural gas, marine diesel oil (MDO) or heavy fuel oil (HFO). One of the main features of the proven and reliable dual-fuel technology is that the engine can be switched from fuel oil to gas operation and vice versa smoothly during engine operation. During switchover, which lasts about one minute, the fuel oil is gradually substituted by gas. In the event of for instance a gas supply interruption, the engine converts from gas to fuel oil operation at any load instantaneously and automatically. Furthermore, the separate liquid fuel system makes it possible to switch over from MDO to HFO and vice versa without power interruption. The pilot fuel is in operation during HFO operation to ensure nozzle cooling. The fuel switch from liquid to gas operation mode can be made on operator’s command. This operation flexibility is a real advantage with the dual-fuel system. The natural gas is supplied to the engine through a gas valve unit, where the gas is filtered and gas

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pressure is controlled. The system includes the necessary shut-off and venting valves to ensure safe and trouble free low pressure gas supply. On the engine, the gas is supplied through a large common-rail pipe running along the engine. Each cylinder then has an individual feed pipe to the gas admission valve on the cylinder head. Gas piping is of double wall design as standard. When running the engine in gas mode, the air / gas mixture is ignited with a small quantity of MDO pilot fuel, less than 1% of full-load fuel consumption. The amount of pilot fuel is optimised for best combustion by the...

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range is 1000–1200rpm for use with 50 or 60 Hz applications. Wärtsilä 20DF is optimal for a wide range of vessel types mounted as generating set. The Wärtsilä 20DF fits perfectly also as mechanical drive prime mover for smaller applications, such as small cargo vessel, ferries or tug boat installations. WÄRTSILÄ 34DF The Wärtsilä 34DF design is based on the well proven and reliable Wärtsilä 32 diesel engine which was introduced on the market in the mid of 1990s. Wärtsilä 32DF covers the middle part of the power range in the dualfuel Wärtsilä engine family. Available cylinder configurations are...

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MAIN TECHNICAL DATA WÄRTSILÄ 20DF Engine type Rated power 60 Hz 176 kW/cyl, 1200 rpm Engine kW Gen. kW Rated power 50 Hz 146 kW/cyl, 1000 rpm Engine kW Gen. kW Generator output based on a generator efficiency of 96.5%. Genset dimensions (mm) and weights (tonnes) Engine type Engine dimensions (mm) and weights (tonnes) Weight Engine dimensions (mm) and weights (tonnes) Engine type Genset dimensions (mm) and weights (tonnes) Engine type * Dependent on generator type. Generator output based on a generator efficiency of 96%. WÄRTSILÄ® is a registered trademark. Copyright © 2012 Wärtsilä Corporation. Engine...

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