A LARGE TURBOCHARGED TWO-STROKE DIESEL ENGINE WITH EXHAUST- OR COMBUSTION GAS RECIRCULATION AND METHOD FOR REDUCING NOx AND SOOT EMISSIONS

摘要

A large two-stroke turbocharged diesel engine of the crosshead type provided with an exhaust gas recirculation system and with a fuel injection system that can, selectively add water to the fuel flow to thereby increase the mass flow through the injection nozzles under particular operating conditions, e.g. at high exhaust gas recirculation rates. The increased mass flow through the injection nozzles improves the entrainment of the fresh charge into the high-speed of the fuel spray and thereby increases the fuel/air mixing and brings the combustion towards the lean side and hence counteracts soot formation.