Effective Reduction of NOx Emissions of Modern Medium Speed Diesel Engines
Good economy and high thermal efficiency of medium-speed diesel engines with direct fuel injection are very favourable characteristics in terms of energy conservation and combating global warming. Despite favourable fuel consumption and high efficiency, high emissions of nitrogen oxides (NOX) and particulate matter (PM) are a major problem researchers working on diesel engine development must address. Certainly the biggest challenge today is to make a compromise between optimal nitrogen oxide (NOX) and particulate matter (PM) emissions. Today, nitrogen oxide (NOX) reduction techniques are widely accepted and based on a combination of diluting in-cylinder air charge with a certain amount of exhaust gas, known as exhaust gas recirculation (EGR), and exhaust gas after-treatment using various sophisticated techniques. Results of the influence of the exhaust gas recirculation (EGR) on the emission of nitrogen oxides (NOX), obtained by experimental research on a medium-speed diesel engine are presented in this paper.