ABSTRACT
“Worldwide emission regulation has been tightening year after year. Numbers of researchers are trying to work out combinations of key technologies to meet the forth-coming emission norms. Exhaust gas recirculation (EGR) for diesel engine to reduce oxides of nitrogen is chosen for present work. The emphasis is given on oxides of nitrogen (NOx). Experiments were carried out on computerized single cylinder four- stroke diesel engine with eddy current dynamometer (10 BHP 7.4 KW).” “Exhaust gas re-circulation set-up is developed. It consists of EGR cooler; air filters box, rota-meter, exhaust control valve, pressure gauge and temperature indicator etc. Engine set-up was modified and coupled with EGR setup. Exhaust gas recirculation system was tested with different EGR percentage. i.e. 0 %, 8 %, 12 %, 15 % & 23 %. Effect of EGR on smoke, NOx and other performance parameters like smoke opacity, brake thermal efficiency, specific fuel consumption were studied. There is considerable reduction in oxides of nitrogen  (NOx).”

In 2010, the U.S. Environmental Protection Agency will be changing its emissions standard to two-tenths of a gram of nitrogen oxides per horsepower hour. This significant reduction will force the diesel engine industry to react strongly to meet the requirements. It’s not too soon to start thinking about which EPA-compliant engine you’ll be buying: a smaller, lighter one that requires urea as an additive, or a larger, heavier one that doesn’t. So – let’s start with the basics: