X-DF Dual-Fuel Design

In 2013, WinGD introduced the X-DF engine series. Dual-fuel engines, using gas admitted at low pressure and ignited by a low volume of liquid pilot fuel was a breakthrough in the marine industry. The X-DF engines offer new marine standards with low-pressure gas technology.

Low-pressure X-DF technology is based on the lean-burn Otto-cycle combustion principle, in which fuel and air are premixed and burned at a relatively high air-to-fuel ratio; a concept already used widely on medium-speed engines.

WinGD has applied a depth of gas engine expertise and experience to its low-speed engines – a move that extends the benefits of DF technology across the broader marine industry. To date, this technology has proven effective  and numerous orders have been placed for a variety of vessel  types, including large and small  LNG carriers, container vessels  and tankers.

The X-DF principle with gas admission (left) Emission reduction examples – switching to gas and ignition (right)

The low-pressure X-DF engines provide the following benefits: 

  • Low-pressure gas supply means maximum simplicity, low investment costs and low power consumption
  • Extremely small pilot fuel quantity, below 1% of total heat release
  •  X-DF engines can be operated on gas down to very low loads 
  • Low NOx emissions, close to zero SOx emissions, IMO Tier III compliant without exhaust-gas after-treatment 
  • Particulate matter emissions reduced to almost zero