Powering Across The Seas
Wärtsilä dual-fuel engines and propulsion systems chosen for two Chinese LNG carrier vessels
Wärtsilä, a marine industry solutions and services provider, said it will supply its 50DF dual-fuel engines and propulsion systems for two liquefied natural gas (LNG) carrier vessels under construction in two Chinese shipyards.
The two orders are similar in scope of supply but have been issued separately. The first is from the Ningbo Xinle Shipbuilding Group Co. Ltd. and its trading partner, Shanghai CSR Hange Shipping Engineering Co. Ltd. The other order has been issued by Cosco (Dalian) shipyards.
Each vessel will be powered by a Wärtsilä 50DF engine, a controllable pitch propeller (CPP), a gearbox and related systems. Wärtsilä said the 50DF engines will enable these vessels to operate primarily on LNG while retaining the option to switch to conventional marine fuels if necessary.
The Wärtsilä 50DF engine is manufactured in various configurations, from a 6-cylinder in-line version to an 18-cylinder version in V-configuration, providing 950/975 kW per cylinder and a total maximum mechanical output of 17.1 MW. The engine speed is 500 or 514 rpm with 50Hz and 60 Hz applications. The maximum thermal efficiency is higher than with any other gas engine, the company said.
When operating in gas mode, the nitrogen oxide (NOx) emissions are at least 85% below those specified in the current IMO regulations, and CO2 emissions are about 25% less than those of a conventional marine engine running on diesel fuel, Wärtsilä said. Additionally, the company said the sulphur oxide (SOx) and particle emissions are negligible at almost 0.0%.
Deliveries of the Wärtsilä equipment are scheduled to begin in the summer of 2014 and the ships will be launched approximately one year later. They will operate mainly in Chinese waters and will transport LNG between terminals and to other ships.