“SK AUDACE”, 180,000 CBM LNG carrier with twin WinGD 6-cylinder X62DF engines Simply a better different Excellence built in The global merchant marine industry is in the midst of a revolutionary transformation. Gas as a fuel for merchant shipping has gained considerable interest during the last years, primarily driven by its inherent potential to reduce emissions, and secondarily due to the fact that gas is a sulphur free fuel, with the potential to be readily available at a feasible price. Winterthur Gas & Diesel (WinGD) is a leading developer of low-speed gas and diesel engines for marine propulsion. Its low-pressure X-DF engines are designed to meet emission requirements far below the IMO Tier III limits, utilising a low cost, highly efficient and reliable low pressure gas admission system. In fact, as the only solution that is specifically made for gas, it is designed to run efficiently – at all loads – from port to port. • The lowest emissions that meet IMO Tier III without additional exhaust gas after-treatment. • Simple, reliable and most economical low-pressure gas supply system, with the fewest components. • Stable operation on gas over the entire load for port-to- port operation and manoeuvring. Key Benefits
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X-DF Excellence Built in - WinGD · PDF WinGD RT-flex50DF IMO Tier III in gas mode Cylinder bore 500mm Piston stroke 2050mm Speed 99–124rpm Mean effective pressure at R1 17.3 bar
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The global merchant marine industry is in the midst of a revolutionary transformation. Gas as a fuel for merchant shipping has gained considerable interest during the last years, primarily driven by its inherent potential to reduce emissions, and secondarily due to the fact that gas is a sulphur free fuel, with the potential to be readily available at a feasible price. Winterthur Gas & Diesel (WinGD) is a leading developer of low-speed gas and diesel engines for marine propulsion. Its low-pressure X-DF engines are designed to meet emission requirements far below the IMO Tier III limits, utilising a low cost, highly efficient and reliable low pressure gas admission system. In fact, as the only solution that is specifically made for gas, it is designed to run efficiently – at all loads – from port to port.
• The lowest emissions that meet IMO Tier III without additional exhaust gas after-treatment.
• Simple, reliable and most economical low-pressure gas supply system, with the fewest components.
• Stable operation on gas over the entire load for port-to-port operation and manoeuvring.
Key Benefits
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X-DF engines in gas modeDiesel engines
Excellence built in
Low-pressure X-DF technology: the industry standardThe first gas engines were developed as high pressure gas-diesel engines, based on the well-known diesel combustion process. The breakthrough in the marine market, however, came with the launch of dual-fuel engines using gas admitted at low pressure and ignited by a low volume of liquid fuel pilot.
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 been well received and orders have been placed for a variety of vessel types, including large and small LNG Carriers, container feeder vessels and tankers.
The low-pressure X-DF technology conceptLow-pressure X-DF technology is based on the lean-burn principle (Otto cycle), 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.
Such a concept on the X-DF engines provides following benefits:
• Low-pressure gas supply means low investment costs and low power consumption
• Pilot fuel quantity below 1% of total heat release
• DF engine can be operated on gas
• Low NOX emissions, IMO Tier III compliant in ECAs without after-treatment
• Particulate matter emissions reduced
Reducing system complexityX-DF technology requires a simple gas supply system, reducing system complexity and auxiliary power consumption. Since the fuel gas is mixed with the scavenge air before
compression, the required gas pressure is below 16 bar at any operating point. As a result, the fuel supply system is relatively simple, reliable and well- proven, ensuring engine efficiency.
ApplicationsX-DF technology is applicable on a variety of vessel types, including LNG carriers, chemical tankers and container ships, and holds excellent potential for vessels operating in Emission Control Areas (Baltic, coasts of North America, Gulf of Mexico). In the marine business, the low-pressure X-DF solution is an increasingly attractive alternative for companies looking for environmentally friendly propulsion solutions.
With a vessel’s lifespan measured in decades, retrofitting an engine to DF operation is often highly cost-effective, since it “future proofs” your investment. The X-DF-ready concept, available on all WinGD X-engines, makes the conversion of low-speed diesel to DF a matter of course – retrofitting can be combined with planned maintenance, during a standard docking period, for example.
Gas admission valve (GAV) Pilot injector
A technical partnership with WinGD and our X-DF engines offers new marine engine standards with low- pressure gas technology. We’re engineering efficiency – improving your operational control, compliance and costs – with new levels of excellence built in.
In an ever-changing world of rising fuel costs and stringent emission targets we are passionate about reducing complexity and helping you meet these challenges.
WinGD 5RT-flex50DF with Turbocharger at the aft end
WinGD 6X72DF engine
Better operational flexibilityThe pre-chamber technology and design for the gas admission valve in our X-DF engines gives you the highest level of combustion stability and reduced emissions, to well below IMO Tier III level.
This reliability in a dual-fuel operation allows for greater load flexibility while improving your port-to-port operations and maneuverability at low speeds, ensuring you have operational control at all times.
Ensured future complianceWinGD offers a better alternative in a world of stringent emission targets. Using benchmark low-pressure technology, you can future-proof your investment and operate safely on all routes with a viable solution to these regulations.
Smokeless operation at all running speeds and an engine idle operation, even in gas mode, keep you compliant with IMO Tier III in ECAs.
This is achieved without additional exhaust gas after treatment system, reducing engineering complexity as well as your gas and particulate matter emissions across the board.
Improved cost efficienciesWinGD develops smarter, efficient engine design with dual-fuel technology in our X-DF engines for low investment costs and lower power consumption.
Featuring the most economic low-pressure supply system and the fewest components, you save on space and fuel costs.
The gas handling and pilot fuel systems keep fuel quantity below 1% of total heat release in the lean burn cycle, which in turn brings additional efficiencies.
Simply a better differentComplex shipping challenges need different thinking. At WinGD, this drives us to set new marine engine standards with low-pressure gas technology in our X-DF engines. We have a hands-on approach and passion for engines to help you focus on the possible.
As a sustainable, long-term global provider, we operate as your agile partner and marine engine specialist to offer simplicity and trusted delivery.
Emission reduction examples – switching to gasThe X-DF principle with gas admission (left) and ignition (right)
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