J-ENG completes tests on ammonia dual-fuel engine
Japan Engine Corporation has completed successful test runs on a seven-cylinder dual-fuel ammonia/heavy fuel oil engine
(Source: J-ENG)
Japan Engine Corporation (J-ENG) has completed successful test runs on a seven-cylinder dual-fuel ammonia/heavy fuel oil engine due to be installed on a medium-sized gas carrier next year. The engine has a 50cm bore, operates at high pressure, and has a selective catalytic reduction system to minimise nitrogen emissions.
Tests on the 7UEC50LSJA-HPSCR engine were overseen by Nippon Yusen Kaisha, Nihon Shipyard, and Japan Marine United Corporation. Following the tests with both fuels, major components were inspected prior to the engine receiving environmental performance and safety certification from ClassNK.
Trial data has revealed that at 100% load and a 95% ammonia co-firing rate, nitrous oxide (N2O) emissions were approximately three parts per million, achieving a reduction of more than 90% in GHG emissions. Meanwhile, nitrogen oxide (NOx) emissions were seen to be about half those of engines burning heavy fuel, with unburnt ammonia emissions virtually at zero. It was also confirmed that the engine’s thermal efficiency when running on ammonia was equivalent or higher than when it ran on heavy oil.
The engine is due to be shipped to the JMU Ariake Shipyard in October for installation on an unspecified gas carrier which is due for delivery in 2026.
J-ENG has also revealed that it is currently working on development of a larger engine with a 60-cm bore, widening the potential market for the new engine type.
