Comparative analysis of the heat balance results of the selected Tier III-compliant gas-fuelled two-stroke main engines

Two-stroke engines are distinguished by the highest overall efficiency among all main engines. This is not only due to low speed, and large piston stroke, but also high combustion temperature, which result in an increase nitrogen oxides (NO<sub>x</sub>) emission. Technical solutions applied bring into compliance with current NO<sub>x</sub> emission standards set Tier III limits include use of SCR EGR systems, implementation Otto cycle, application liquified natural gas (LNG) as low-emission fuel. Impact available III-compliant technologies on heat balance results analysed using example currently most popular dual-fuel engines, i.e. WinGD X92DF MAN G95ME-C10.5-GI. The possibilities waste recovery electricity generation process thereby improving ship energy discussed.