In the present publication it is considered the technology and the features of the operation of the newly introduced in the marine industry wide spreading dual fuel four stroke engines. There are analysed the significant differences between the conventional Diesel engines and the dual fuel Otto engines in their operation process. The influence of the gas fuel quality in the case of the dual fuel engines is in the main concern underlined. Simulation based experiment is carried out for data attaining, related to the performance of the dual fuel engines influenced by the fuel quality on high load range. The acquired data is analysed, and evaluation of the engine derating outcome is performed. On the base of the results are stated conclusions and recommendations to be followed by the engineering crew members dealing with such kind of engines on board LNG fuelled ships.
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