Japan Engine Co (J-Eng) has demonstrated the first engine in a new series that offer an unusual solution to impending IMO sulphur limits, using only one of the most expensive fuels available.
The company believes that optimising its engine design for marine gas oil (MGO) will enable operators – particularly those operating in 0.1% sulphur Emission Control Areas (ECA) - to achieve cost-efficient compliance while avoiding the uncertainties around other options.
A spokesperson for J-Eng said: “We expect to acquire some market share for medium-sized and small vessels which operate mainly in ECAs, and to increase production to 12 engines a year from 2022. Chinese licensees might also manufacture the engines soon. The Chinese market is promising for mono-fuel engines due to local sulphur regulations.”
The new five-cylinder, 500mm bore 5UEC50LSJ engine is claimed to reduce fuel consumption by 5% compared to the corresponding conventional engine model. For the Tier III engine the saving reduced to 4%. A spokesman said that the fuel consumption saving reaches nearly 10% if the difference in calorific value between MGO and heavy fuel oil is taken into account.
The low fuel consumption is achieved partly by fine-tuning combustion, including atomiser design, fuel injection pressure and scavenge air port arrangement. The new model also uses water injection to reduce NOx formation, and therefore the need to compromise fuel consumption as a countermeasure, by lowering combustion temperature.
The engine is be best suited to vessels below 60,000 dwt, in particular handysize bulk carriers. It will be available for delivery in late 2019, with a six-cylinder variant expected the following year