A Study on the Tandem System for NOx Reduction of a Light-Duty Diesel Engine 18ICES/053
Authors
Jeong-Gil Nam - Mokpo National Maritime University
Joo-Yol Choi - Mokpo National Maritime University
Jae-Sung Choi - Korea National Maritime University
Abstract
The effects of a WI(Water Injection) at the intake pipe and an urea injection at the exhaust pipe for a 4-cylinder DI(Direct Injection) diesel engine were investigated experimentally. The water quantity was controlled by temperatures of intake manifold and MAF(Manifold Air Flow). In addition, the urea quantity was controlled by NOx quantity and MAF. Effects of WI system, urea-SCR system and tandem system were investigated for with and without EGR(Exhaust Gas Recirculation). Several experiments were performed to characterize the urea-SCR system, using engine operating points of varying raw NOx emissions, space velocity, and SCR catalyst temperature. As the results, the SUF(Stoichiometric Urea Flow) and NOx map were obtained. In addition, NOx results can be visualized with engine speed and engine load. It was concluded, therefore, that the NOx reduction effects of the tandem system without the EGR were more than those with the EGR base engine.