Tag: dual fuel engines

ClassNK has granted approval to the design of the new 28AHX-DF dual-fuel engine developed by Niigata Power Systems. The new engine is slated to be used as the main engine on a new LNG-fuelled tugboat being built by Keihin Dock Co., Ltd. for NYK Line. The vessel will be Japan's first LNG fuelled vessel, excluding LNG carriers. New regulations for Emission Control Areas (ECA), including new stricter limits on sulfur emissions as well as the IMO's Tier III NOx emission limits, are driving demand for new engine and emission control technologies. The high costs associated with low sulfur fuels, and the increasing availability of LNG is driving both vessel owners and machinery manufacturers to consider the use of LNG as a vessel fuel. Niigata's 28AHX-DF is a medium-speed duel-fuel engine with a maximum rated power per cylinder of 320kW and was developed for use primarily in offshore support vessels and tugboats. The engine, which operates on both diesel fuel and LNG, will meet the strict 0.1% sulfur emissions regulations in the ECA that are set to go into effect in 2015, as well as comply with the IMO's stringent Tier III NOx emission requirements. Technologies used in the new engine ...

The Daewoo Shipbuilding and Marine Engineering (DSME) yard in South Korea has ordered a total of 54 Wärtsilä dual fuel engines to power 172,600 cbm icebreaking LNG carriers being built for use in arctic conditions to serve the Yamal LNG project in Northern Russia. The ships will be owned by one joint venture between Teekay LNG Partners of Canada and China LNG Shipping (CLNG), and another joint venture between China Shipping LNG Investment Co.,Ltd. (CSLNG) and Japan based Mitsui O.S.K. The order for engines was placed with Wärtsilä’s Korean joint venture company, Wärtsilä Hyundai Engine Co., (WHEC) in October. The Wärtsilä machinery is capable of operating on liquefied natural gas (LNG), heavy fuel oil (HFO), or low-viscosity marine diesel oil (MDO) but LNG will be the main type of fuel to be used. When operating in arctic waters the engines will be operating in ambient temperatures of as much as minus 50 degrees Celsius on LNG carriers breaking through ice more than two metres thick, in operating modes that allow dramatic variations in engine load within a limited period of time. Wärtsilä’s ability to meet these demanding design criteria was a key factor in the award of this contract. For ...

MAN Diesel & Turbo has received an order for four MAN B&W 5G70ME-GI engines in connection with Daewoo Shipbuilding & Marine Engineering Co., Ltd. (DSME) agreeing a deal with the BW Group to build two LNG carriers. The technical engine specification complies with IMO Tier II, with options to include remedies for Tier III compliance at a later stage. The 173,400 m3 vessels are scheduled for delivery in late 2017/early 2018 and will be built at DSME’s Okpo shipyard in Geoje, Korea. The deal represents the second LNG ME-GI contract for DSME after a previous order signed in 2012. Compliance with IMO Tier III regulations basically requires an 80% reduction in NOx emissions – compared to Tier I – within the designated emission control areas (ECAs) over a defined test cycle. MAN Diesel & Turbo has successfully developed two main approaches to comply with these challenges: Selective Catalytic Reduction (SCR), which involves the catalytically accelerated reaction of nitrogen oxides with ammonia to form water and nitrogen, and Exhaust Gas Recirculation (EGR), which works by recirculating a portion of an engine's exhaust gas back to the engine cylinders. Both methods enable compliance with the most stringent of regulations and give the ...