Dual-Fuel Engines

DE20DF / DE23DF / DE28DF / DE35DF

Further reducing the environmental impact of our engines we introduce our DF engine lineup: dual-fuel engines that switch seamlessly between gas and liquid fuel and, unlike a conventional diesel engine, can cut NOx by up to 80% during gas mode operation. This series brings together tried and tested technologies from our accredited diesel and gas lines into one economic solution.

    1. Complies with IMO NOx Tier3 exhaust emission regulations (in gas mode)
    2. Low-fuel consumption realized with lean combustion technology and optimum valve timing(variable valve timing-mechanism)
    3. Improved redundancies with the independent pilot fuel injection system, and peace of mind thanks to the Independent Safety System (ISS) fail-safe control
    4. Four-stage loading possible in gas mode (load response improvement)
      *In the case of using DE28DF
    5. Supports various fuels(Oil:HFO/MDO/MGO, GAS:LNG)

    Safety Features of the Engine's Gas Piping Area

      • Double-walled gas piping system
      • Ventilation function of first wall piping lines, and installed gas leak detection
      • Instantaneous switching to diesel mode in the event of gas slip (failure of gas supply system), with injection of inert gas into the gas fuel pipe

      Specifications

      Model Unit DE20DF DE23DF
      Maximum engine output kWm 890
      1,200 
      Rotation speed min-1 900 900 
      No. of cylinders 6 6
      Bore mm 205 230
      Stroke mm 300 320
      Fuel

      Natural gas(gas mode)

      MDO, MGO, HFO(diesel mode)

      Pilot fuel(gas mode) MDO or MGO(approx. 1% of total heating value)
      Overall Length(*) mm 5,395 6,205 
      Overall Width(*) mm 1,885 1,925
      Overall Height(*) mm 3,245   3,330 
      Piston Overhaul Height(*) mm 1,530  1,645 
      Generator Set Dry Mass(*) ton 17  27 
      Model Unit DE28DF DE35DF
      Maximum engine output kWm 1,730 / 3,060 / 4,080
      Rotation speed min-1 720 / 720
      No. of cylinders 6 / 6 / 8
      Bore mm 280 350
      Stroke mm 390 440
      Fuel Natural gas(gas mode)
      MDO, MGO, HFO(diesel mode)
      Pilot fuel(gas mode) MDO or MGO(approx. 1% of total heating value)
      Overall Length(*) mm 7,195 / 9,065 / 10,470
      Overall Width(*) mm 2,040 2,395
      Overall Height(*) mm 3,995 / 4150
      Piston Overhaul Height(*) mm 2,065 2,555
      Generator Set Dry Mass(*) ton 36 / 81 / 98

      ※ Actual dimensions and mass may vary depending on the specifications of the generator unit.

      DF Engine Structure