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Impacts of exhaust gas emissions on the environment andair pollution from ships have received considerable attention inthe past few decades. Due to the characteristics of the combustionprocess, typical for large marine two-stroke low-speed engines,and the use of residual fossil fuels, the world’s fleet emits into theatmosphere significant amount of pollutants such as nitrogenoxides (NOx), carbon monoxide (CO), carbon dioxide (CO2),hydrocarbons (HC), sulphur oxides (SOx) and carbon particles(PM). Impact assessment of the process of their formation,emitted amounts and the influence of emission are importantfactors for decision making in regulation development and alsofor engine designers who aim to improve low-speed two-strokemarine engines, for further tightening of regulations regardinglimiting emissions. This paper consists of three parts: the firstsection describes the injection and combustion process in lowspeedtwo-stroke marine engines, the second part describesthe formation of the exhaust gas emissions as a product of thecombustion process and the third part, in which the knowntechniques to reduce harmful emissions that are currently usedin low-speed two-stroke marine engines are described

Optimization of Ship Propulsion Diesel Engine to Fulfill the New Requirements for Exhaust Emissions