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Abstract
The dual fuel engine, powered by LNG combined with biodiesel pilot injection, has appeared in marine transport vehicles as an extremely attractive solution due to its low emissions and fuel flexibility. The numerical simulation is suitable to understand the combustion and emission characteristics of dual fuel engines. This paper focuses on building a numerical model based on Diesel RK software to apply to the problem of dual fuel engine based on Wärtsilä 6L20DF engine, in order to analyze the performance and emission characteristics from 25% to 100% of loads and 1200 rpm of speed. Simulation results show that the use of blended biodiesel (B50) in liquid mode reduces CO and HC emissions by 26% and 22% respectively compared to pure diesel (D100). Furthermore, in dual fuel mode, compared to D100, the dual fuels have the advantage of economic characteristics with savings about 17% and NOx emissions reduction by 89%. Therefore, the use of dual-fuel including LNG and biofuels offers great prospects in meeting economic and environmental criteria for marine engines.