Winterthur Gas and Diesel (WinGD) along with Doosan Engine have exhibited Wartsila’s first low-speed low-pressure six-cylinder X62DF (W6X62DF) engine for a commercial application.
During the demonstration at Doosan’s works in Changwon, Korea, the engine operated under a number of load and fuelling conditions and has been assessed on its engine control features, tuning, economy and emissions.
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The engine’s design fuel consumption was validated with a Tier III NOx emissions compliance in gas mode, without any additional exhaust treatment, coupled with its ability to be functionally stable in a wide operating window.
It features a classification society type approval testing (TAT) approved WinGD’s X-DF technology and RT-flex50DF low-pressure gas admission.
The X-DF technology is said to facilitate a reduced capital expenditure (CAPEX), owing to its convenient and low-cost liquified natural gas (LNG) fuel gas handling system, required for gas admission at pressure below 16 bar.
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On the other hand, the technology is expected to augment the operating expenditure (OPEX), particularly for LNG carriers since it requires no high-pressure gas compression system external to the engine to enable the usage of natural boil-off gas (nbog).
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By GlobalDataThe technology also allows the engine to stably operate on gas across the entire load range from 5% to 100% with no additional requirement of increasing liquid fuel injection under any situation where sufficient gaseous fuel is available.
WinGD has announced the availability of the fuel-sharing feature in the X-DF engines later this year, which will enable the vessel operators with an increased flexibility to utilise liquid and gaseous fuel simultenously.
W6X62DF engine is the first sold X-DF engine to be incorporated into the new generation very large LNG carriers.
Doosan is currently testing the engine prior to its delivery and is one of a pair that will power the first of two 180,000 coalbed methane cbm LNG carriers being built by Samsung Heavy Industries for SK Shipping and Marubeni.
Image: The Wärtsilä 6X62DF engine’s launching celebration at Doosan’s works. Photo: courtesy of Winterthur Gas & Diesel Ltd
