Feature 3
In the meantime, there is an upsurge of
development in medium-speed dual-fuel engines and a widening adoption of dual-fuel powering solutions by shipping operators, prompted mainly by the prospect of tougher environmental legislation and controls. Dual-fuel four-stroke engines are proving to be one of the main business successes of Wärtsilä’s ship power division, and the company’s belief in future strong demand for dual-fuel machinery has spurred new developments. Te latest addition to the range is the 200mm-bore 20DF, which made its service introduction in 2011. Te first order entailed auxiliary engines for a North Sea offshore support vessel. Wärtsilä’s incorporation of advanced
electronic combustion control has led to improved performance and greater reliability in gas-burning engines. Te flexibility to shiſt between natural gas, heavy fuel oil, light fuel oil and potentially other liquid fuels offers
a number of practical benefits to vessel owners and operators. Tese advantages will become more important not only because of tightening environmental legislation but also due to continuing volatility in oil prices. Te Hamburg, Germany-headquartered
Caterpillar Marine Power Systems, Caterpillar’s marketing and service company for Cat and MaK marine engines, announced the development of an MaK dual-fuel, medium-speed engine in November 2011. Te prototype of the MaK M46DF engine is under test at Caterpillar’s medium-speed engine works in Rostock and it is expected that the first commercial deliveries will be made in 2014. Te M46DF will have a power rating of 900kW per cylinder in both its 500rpm and 514rpm versions, in either diesel or gas mode. Te engine, which has the same footprint as the M43C diesel, will allow fuelling by natural gas, marine diesel oil (MDO) or heavy fuel oil (HFO), and will allow switching between fuels during
operation without interruption. In gas mode, the M46DF will meet future IMO Tier III limits on NOx emissions, as well as future US EPA Tier 4 regulations. Options available to ship owners and
shipbuilders are set to increase this year as a consequence of Korean development of a dual-fuel engine. Hyundai Heavy Industries’ Engine & Machinery Division(HHI-EMD) is aiming to start marketing its new HiMSEN H35DF engine in mid-2012, following type approval tests, with a view to making the first deliveries about one year later. With an output of 480kW per cylinder at a speed of 720rpm, the H35DF will be produced in six- to nine-cylinder in-line models, and in 12- to 20-cylinder vee-form arrangements. Te design will accordingly cover unit-powering requirements, at maximum continuous output, from 2880kW up to 9600kW. When operating on natural gas, the engine will satisfy IMO Tier III NOx criteria, while being IMO Tier II-compliant in diesel mode.
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