First Unit Demonstrated by Doosan in Changwon, Korea
The first low-pressure, two-stroke Wärtsilä X62DF dual fuel engine, a six-cylinder unit, was demonstrated this week at Doosan Engine’s work in Changwon, Korea, says Switzerland-based distributor Winterthur Gas & Diesel. The engine is now in tests.
The W6X62DF is one of a pair that will power the first of two 180,000-cubic-meter LNG carriers being built by Samsung Heavy Industries Korea for SK Shipping and Marubeni Corp. It is also the first X-DF engine sold for a new generation of very large liquefied natural gas carriers.
Winterthur Gas & Diesel – aka WinGD – is a joint venture company owned 70% by China State Shipbuilding Corp and 30% by Wärtsilä.
In addition to witnessing the W6X62DF running under a number of load and fueling conditions, visitors to the X-DF “Powering the Future” event in Changwon saw “validation of its engine control features, tuning, economy and emissions,” states a release.
“Key aspects confirmed included the engine’s design fuel consumption, its Tier III NOx emissions compliance in gas mode without any additional exhaust treatment – and its capability to run stably in a wide operating window.”
Easier Use of Boiloff
Winterthur says that capital expenditure reductions of 15% to 20 % are possible compared to other low-speed dual-fuel engine technology: “This results from the substantially simpler and lower cost LNG fuel gas handling system needed for gas admission at pressure below 16 bar,” the company says.
Operating costs are expected to be lower too, especially for LNG carriers, since no high-pressure gas compression system is needed to use boiloff gas.
Five to Eight Cylinders
Winterthur also advised customers in Korea that “Fuel-Sharing” will be available on X-DF engines later in 2016. “This feature aims to give vessel operators broad flexibility to use liquid and gaseous fuel at the same time if economically viable at a given time,” the company says.
The two-stroke Wärtsilä X62DF is available in configurations of five to eight cylinders, Winterthur says, covering a power range from 7,700 to 19,080 kilowatts – 10,325 to 25,586 horsepower. It is promoted not only for LNG carriers, but for Aframax tankers, Panamax and Kamsarmax bunkers, and feeder container vessels.Contact information is only available to premium subscribers. Click here to purchase a premium subscription.
Source: Winterthur/WinGD with HHP Insight follow-up