Research on Effect of EGR and SCR on NOX Emission from a Heavy Duty Diesel Engine
American Journal of Environmental Protection
Volume 6, Issue 2, April 2017, Pages: 26-30
Received: Jan. 4, 2017; Accepted: Jan. 23, 2017; Published: Mar. 18, 2017
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Ren Hongjuan, College of Automotive Studies, Tongji University, Shanghai, China; College of Automotive Engineering, Shanghai University of Engineering Science, Shanghai, China
Lou Diming, College of Automotive Studies, Tongji University, Shanghai, China
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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, NOX 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 NOX are smaller than the effect of SCR. Only under the conditions of high emissions concentrations of NO2, EGR and SCR significantly reduce NO2 emission concentration.
Diesel Engine, Exhaust Gas Recirculation (EGR), (SCR), Nitrogen Oxides (NOX)
To cite this article
Ren Hongjuan, Lou Diming, Research on Effect of EGR and SCR on NOX Emission from a Heavy Duty Diesel Engine, American Journal of Environmental Protection. Vol. 6, No. 2, 2017, pp. 26-30. doi: 10.11648/j.ajep.20170602.11
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This article is an open access article distributed under the Creative Commons Attribution License ( which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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