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WinGD launches new low-speed, two-stroke engines

5 June 2019

WinGD (Winterthur Gas & Diesel) has announced three new low-speed, two-stroke engines that are capable of operating on lower emission, natural gas fuels. Building on the WinGD low-pressure dual fuel technology, the new additions to the portfolio include:

The WinGD (and formerly Wärtsilä) low-pressure X-DF technology is based on the lean-burn Otto-cycle combustion principle, where natural gas and air are premixed and burned at a relatively high air-to-fuel ratio; a concept already used widely on medium-speed engines. The ignition is achieved using a small pilot diesel fuel quantity, below 1% of the total heat release. The low-pressure gas technology can achieve IMO Tier III emissions without aftertreatment, while the alternative high-pressure dual fuel engine technology produces more diesel-like combustion and requires SCR aftertreatment to meet the Tier III NOx limits.

X40DF Dual Fuel Engine. The new X40DF is designed to run on LNG, offering the first two-stroke dual-fuel engine for smaller vessels. The engine is compliant with all existing emission regulations, including IMO Tier III, without the need for any exhaust gas aftertreatment system. The X40DF, low-pressure, dual-fuel engine is available in 5 to 8 cylinder configuration (with the bore diameter of 40 cm), covering a power range from 2,775 kW to 7,480 kW, at 104 to 146 rpm.

X82-D Diesel Engine. For larger vessels, WinGD’s new X82-D diesel engine is dual fuel (DF) ready, with the ability to upgrade to operation with LNG, fulfilling requirements for gas-ready notations from Classification Societies. The cylinder distance has been reduced to 1440 mm from 1505 mm, compared to the previous X82-B version. The brake specific fuel consumption (BSFC) has also been reduced depending of the rating point and the tuning variant. The X82-D engine offers enhanced propulsion options within the VLCC, VLOC and Panamax container vessel segments.

Offered within WinGD’s Generation-X engine portfolio, the X82-D engine will be available from 6 to 9 cylinders, covering a power output from 16,560 kW at 58 rpm to 49,500 kW at 84 rpm.

Key benefits of the X82-D include reduced engine length and weight, due to shorter cylinder distance with adapted bearing. All cylinder configurations are possible with a one piece crankshaft design further reducing engine length and with pistons fitted with two piston rings for reduced friction losses. The X82-D has also been designed with optimized liner design to avoid cold-corrosion occurring within the cylinder.

Relative to the previous X82-B version, fuel savings of 1170 USD/day (2.6 ton/day consumption at assumed HFO cost of 450 USD/ton) can be achieved for a VLCC running and X82-D engine at 90% engine power, according to WinGD. This is achieved as a result of an increased firing pressure.

X82DF Dual Fuel Engine. Allowing for the same enhanced propulsion options as the X82-D for larger vessels, the new X82DF is the latest offering in WinGD’s low-pressure X-DF dual-fuel engine portfolio. The engine dimensions are based on that of the X82-D diesel engine design but follows the premixed, Otto-cycle combustion principle.

The X82DF engine has an integrated gas pressure regulation unit (iGPR), replacing the standalone GVU. The pre-chamber technology and the advanced design of the low-pressure gas admission valves offers a high level of combustion stability and reduced emissions. The X82DF NOx emissions are below that of the IMO Tier-III level in gas mode without exhaust gas aftertreatment. At 75% engine load, the X82DF requires less than 0.5% of pilot fuel.

Since the launch of the X-DF engine series in 2013, the technology accumulated over 230,000 running hours, with 212 engines in operation and/or on order.

Source: WinGD