Abstract
Experimental study was conducted on NOX emissions law of a heavy diesel engine with EGR and SCR. Opening of EGR valve (OEV) was adjusted by INCA, and ammonia nitrogen ratio (ANR) was changed by controlling urea injection quantity with control unit DCU of SCR. Under low, medium and high speed and 50%, 75% and 100% load conditions, the effect of EGR (exhaust gas recirculation) and SCR (selective catalytic reduction) on diesel engine NOX emission was studied by test. The results show that when a heavy diesel engine use EGR and SCR, the conversion magnitude and conversion ratio of NO increased significantly, NO<sub>X</sub> emissions rule is similar to that of NO, and when opening of EGR valve is more than 25%, the effects of OEV increasing on NO and NO<sub>X</sub> are smaller than the effect of SCR. Only under the conditions of high emissions concentrations of NO<sub>2</sub>, EGR and SCR significantly reduce NO<sub>2</sub> emission concentration.
Highlights
Since diesel engine has the advantages of low fuel consumption, high torque output and high reliability, it has been widely used in the field of transportation, agricultural machinery, construction machinery, and etc [1]
When diesel engine operate at the condition of 1295 r/min and 50% load, the decrease of NO volume emission concentration corresponded by OEV 25% and ammonia nitrogen ratio (ANR) 0.5, OEV 25% and ANR 1, OEV50% and ANR 0.5, OEV 50% and ANR 1 are individually 100.12×10-6, 173.23×10-6, 115.81×10-6, 202.47×10-6
When diesel engine operate at the condition of 1295 r/min and 100% load, the decrease of NO volume emission concentration corresponded by OEV 25% and ANR 0.5, OEV 25% and ANR 1, OEV 50% and ANR 0.5, OEV 50% and ANR 1 are individually 218.81×10-6, 327.62×10-6, 268.39×10-6, 382.72×10-6
Summary
Since diesel engine has the advantages of low fuel consumption, high torque output and high reliability, it has been widely used in the field of transportation, agricultural machinery, construction machinery, and etc [1]. Compared with gasoline engines, NOX and PM emissions from diesel engines are more. Considering the trade-off relations of NOX and PM from diesel engines, the approach of diesel engines emission reaching VI standards is to research and develop post-processing technology (SCR) for diesel engines on the basis of controlling NOX production in the cylinder by EGR [3]. Foreign scholars have researched the diesel engine using EGR and SCR technologies from the aspects of theory, test and control [4,5,6,7]. The influence of EGR and SCR on NOX emission from a heavy duty diesel engine is studied by test, and the experimental results are analyzed
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