Consideration of Split Injection Strategy for Marine Diesel Engine Combustion Process

摘要

Split injection strategy is proved to be able improving diesel engine combustion process in cylinder chamber. The injection is separated by dwelling time that splits into two or more injections. This paper examined how split injection can contribute to reduce exhaust emissions in marine diesel engines, especially in order to comply with MARPOL NOx Tier III regulation. Ordinarily, NOx and soot exhaust emissions decrease in all ISR modes without any significant changes except the addition of dwelling time. However, after-injection mode obtaining the most satisfactory result for NOx emission reduction, while before-injection mode is possible whereas less desirable effect without using exhaust gas re-circulation (EGR) in NOx reduction. Similar to marine diesel engines, the review results identify that without using EGR the efforts to reduce NOx have not been maximized. It decreases NOx up to 90% when using EGR with split injection strategy and comply with Tier III regulations. Finally, recommendation was given for the implementation of split injection strategy on marine diesel engines for future research.