NOx Reduction by Exhaust Gas Recirculation – MAN explains
When measured in the exhaust duct of a marine diesel engine nitrogen oxide or NOx emissions comprise about 95% nitric oxide (NO) and 5% nitrogen dioxide (NO2), which is formed as NO oxidises after the engine. The formation rate of the majority of nitric oxide is dependent on peak temperatures in the engine cylinders – above 1200oC the formation is significant and above 1500oC it becomes rapid.
