Investigations of exhaust emissions of diesel/ethanol compound combustion in a turbocharged inter-cooled diesel engine

Experimental study on simultaneously reduction of NOx and PM emissions of diesel/ethanol containing water compound combustion (DECC) in a turbocharged inter-cooled diesel engine. The results show that NOx and PM are decreased remarkably with the penalty of HC and CO increasing. The later can be reduced by DOC (diesel oxidation catalytic converter). Using the fuel delivery system of the baseline engine, the emission in DECC can meet the national phase III emission standard based on the baseline engine in a national phase II engine. According to the national phase III specified test requirement, NOx from the DECC diesel engine is reduced from 6.49 g/(kWh) of the baseline engine to 3.46 g/(kWh), PM is reduced from 0.142 g/(kWh) to 0.089 g/(kWh), HC is increased from 0.237 g/(kWh) to 0.34 g/(kWh), CO is increased from 0.081 g/(kWh) to 0.10 g/(kWh). The results are even lower than the national phase III emission standard. The result of ELR (Europe load response test) shows exhaust smoke of 0.687 m-1 which is lower than national phase III emission standard. It is a feasible approach to decrease exhaust PM emission by using DECC in a turbocharged inter-cooled diesel engine. Exhaust pollutants except PM meet national phase IV without decreasing fuel economy.