Exhaust Gas Recirculation/Water Injection Experimental Resultsfor NOx Emission Reduction in Diesel Engine

Abstract

This paper presents the static characteristics of EGRWI combined system. The water injection system was statically characterized by recording the engine exhaust outlet NOx emissions for comparison with baseline NOx emissions. Effects of the water injection system on CO and HC emissions and fuel consumption were examined. The research engine used for these experiments was a 103 kW turbocharged, intercooled, 2.5 L VM Motori CIDI engine equipped with a cooled EGR system.Water injection in the intake system demonstrated the potential for significant reductions in engine outlet NOx emissions. The system has reduced engine outlet NOx emissions by 4050%, but caused significant increases in CO and HC emissions, particularly at low loads. Fuel consumption effects were minimal.