INFLUENCE OF LOAD CONDITIONS AND LOAD CONDITION NOx EMISSIONS

Abstract

This paper presents research on the effects of the operation mode and advance angle of fuel injection on the emission characteristics NO_x of a two-stroke heavy-duty marine engine. The tests were carried out on marine engine MAN B&W 6S70ME-C8.2 with different load and different advance angle of fuel injection. NO_x emission characteristic was presented and discussed. The experimental results reveal that increasing advance angle of fuel injection and engine load in increase NO_x emissions. NO_x emissions in the engine exhaust are the smallest when the engine is working around 50% load. When the engine load changes in the range of 30-65%, NO_x emissions are always within the allowable limits. However, when the engine load is less than 25% or more than 75% and advance angle of fuel injection is greater than 15^o, NO_x emissions are greater than 14.4g/kW.h. The results were in line with the literature reviews [5, 6, 8] and would be good material for operators who want to reduce the engine exhaust gas emission in order to meet the stricter IMO emission regulations.