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Enhancing Fuel Efficiency and Environmental Specifications of a Marine Diesel When using Fuel Additives


  • Marine power plants department of National University Odessa Maritime Academy, Odessa, Ukraine


Objectives: The article is aimed at discussing the results of application of marine motor fuel additives. Method: A method for improving fuel performance properties by applying fuel additives has been proposed. A 6N21L medium-speed fourstroke cycle diesel by Yanmar was used for this research. A RME25 marine fuel, viscosity of 25 sSt at 100oC and sulphur content of 2.8 w.w%, was applied. An additive containing active oxygen-bearing groups and modified with light metal salts was used as a fuel additive. Findings: Experiments were done, using three diesels of the same type, which allowed for one diesel to run on the basic fuel, and for feeding the additive-containing fuel into cylinders of two other diesels (following additional equipment of the fuel system with a flow meter and a dispenser). Specific fuel oil consumption, exit gas temperature, NOx and SOx concentration in the exit gases, and technical condition of fuel system and cylinderpiston group elements were determined in this experiment. It was shown that the use of fuel additives improves fuel efficiency of a marine diesel, in particular reduces specific fuel oil consumption by 3.5 to 5.8% subject to diesel load and additive concentration in the fuel. Improved environmental performance of the diesel, i.e. NOx reduction by 1.4 to 4.3% and SOx reduction by 15.6 to 22.9% in exit gases, was also found. It was shown that additive concentration is of optimal importance, can be determined experimentally and depends on diesel and fuel specification. Improvements: Improved technical condition of diesel cylinder-piston group and gas outlet system elements was determined as a result of visual inspection, thus reducing work labor input for diesel purging by 20 to 25%.


Environmental Diesel Performance, Fuel Additives, Fuel Efficiency, Intensified Fuel Combustion, Marine Internal Combustion Engine, Marine Diesel Fuel, NOx and SOx Concentration in Exit Gases, Specific Fuel Oil Consumption, Thermal Diesel Factor.

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