Page 34: of Maritime Reporter Magazine (July 2015)

PROPULSION UPDATES

Two-Stroke DF Engine Passes Critical Test he ? rst Wärtsilä low-speed two- Heavy Industry Co., Ltd., also in the temperatures and the motion of the ship, by two-stroke engines in which gas is stroke dual-fuel (DF) engine People’s Republic of China. While de- the vessel will comply with both the injected under high pressure. Thus, not

Tdestined for a commercial appli- signed to ocean-going standards, in ser- NOx and SOx requirements of the strict- only can our fuel system be simpler and cation has reportedly completed its Fac- vice the LNG carrier will operate prin- est IMO emissions regulations without less expensive, it saves a considerable tory Acceptance Test (FAT) at a Chinese cipally in Chinese coastal waters and exhaust after-treatment. The FAT took amount of onboard electrical power, licensee of Winterthur Gas & Diesel deliver LNG to terminals in the estuar- place on June 2-3, 2015, in the presence which means that a vessel’s auxiliary (WinGD), the Switzerland-based de- ies of major Chinese rivers. WinGD’s of representatives from the classi? cation generators can be dimensioned smaller. signer, developer and licensor of Wärt- scope-of-supply for this project also in- societies, the ship owners, the shipyard, Such savings are, of course, of special silä brand low-speed two-stroke engines. cludes a gas valve unit (GVU), some an- YCMP and WinGD. Inspection of the interest on smaller LNG carriers such as

The engine is a ? ve cylinder, 50 cm cillary equipment and the commission- engine and selected components accord- the 14000 cu. m. vessel which this en- bore 5RT-? ex50DF built by Yuchai ing of both the engine and GVU aboard ing to classi? cation society requirements gine will power.”

Marine Power Co., Ltd. (YCMP) at its the LNG carrier. took place on June 4, 2015. “The system factory in Doumen, Zhuhai City, Guang- The 125.8 x 22.7 x 7.2 m LNG Car- is based on the low-pressure gas admis- WinGD Dual-Fuel Tech dong Province, in the South of the Peo- rier will have a rated power of 6000kW sion system proven over more than two Pioneered by Wärtsilä on medium- ple’s Republic of China. at 124 rpm, with a capacity to carry decades on Wärtsilä four-stroke DF en- speed four-stroke engines in the mid-

It will power a new “handy-size” LNG 14,300 cu. m. of LNG. With its Wärt- gines,” said Martin Wernli, CEO Winter- 1990s, WinGD’s low-speed DF marine carrier, designed by MARIC, in the ? eet silä 5RT-? ex50DF two-stroke dual-fuel thur Gas & Diesel Ltd. (WinGD). “Our engines employ the lean burn Otto cycle of Chinese ship-owner and operator engine burning the “natural boil off gas” product objectives were to reduce both – i.e. ignition of a lean air-gas mixture by

Zhejiang Huaxiang Shipping CO., Ltd. (NBOG) which arises through vaporiza- ? rst and operating costs. The 5RT-? ex- injection of a small amount of liquid fuel

The new vessel is under construction at tion of a small part of an LNG carrier’s 50DF does not require the high-pressure – with the gaseous fuel admitted to the the shipyard of Qidong Fengshun Ship cargo due to the ambient air and sea electrically-driven compressor needed cylinders at low pressure via electroni- cally-controlled valves.

The lean burn combustion of gaseous fuels is an enabler of both the low emis- sions and high ef? ciencies of WinGD low-speed DF engines. Even without af- tertreatment their NOx emissions in gas operation mode are within the limits set by IMO TIER III for vessels operating in

Emissions Control Areas (ECAs), while natural gas is virtually sulfur-free, also ensuring compliance with IMO limits for SOx emissions in ECAs.

Moreover, since methane is the major constituent of natural gas and the sim- plest combination of hydrogen and car- bon in the hydrocarbon series, in their gaseous fuel mode, the CO2 emissions of WinGD DF engines are lower than from diesel engines of comparable per- formance. The lean burn combustion process is also an enabler of the excel- lent ef? ciencies attained by modern gas engines. To provide back-up operation for emergencies and voyages where arisings of NBOG are insuf? cient, the 5RT-? ex50DF is equipped with a fully dimensioned liquid fuel system capable of injecting either HFO or distillate fuels (e.g. MDO or MGO). In its 100% liquid fuel mode the 5RT-? ex50DF is compli- ant with IMO TIER II exhaust emissions regulations.

www.wingd.com 34 Maritime Reporter & Engineering News • JULY 2015

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