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Performance Assessment of Urea-Selective Catalytic Reduction (SCR) Technology in On-Road 6-Cylinder Heavy-Duty Diesel Engine
ISSN: 0148-7191, e-ISSN: 2688-3627
To be published on September 25, 2020 by SAE International in United States
Event: International Conference on Advances in Design, Materials, Manufacturing and Surface Engineering for Mobility
Diesel engines have been widely popularized as a power source for vehicles because of its reliable horsepower and excellent fuel economy. Diesel engines are considered as one of the dangerous sources of pollution. PM and NOx are the dominant pollutants emitting in exhaust gases. As per the supreme court order, Indian market will see only the sale of Bharat Stage-VI vehicles from April 1, 2020. More stringent NOx standards in BS-VI legislation for heavy duty vehicles would help to reduce NOx emission around 88.57% and 86.85% for steady and transient test cycles respectively. Urea SCR technology is used for reduction of NOx level. SCR is a media of converting NOx into diatomic nitrogen and water with the aid of Cu-Zeolite catalyst. Aqueous urea named as DEF is used as reductant which is added in a stream of exhaust gases. This experimental study focuses on performance evaluation of urea-SCR system in heavy duty vehicle. Effect on NOx conversion efficiency and NH3 slip is observed by varying the parameters such as inlet temperature of SCR, ammonia to NOx ratio (ANR) and space velocity. Experiment is carried out on heavy duty engine in test cell. Engine testing is also carried out to check NOx emission level by running emission cycles such as WHSC, WHTC and NTE. In addition, performance analysis is done on ammonia slip catalyst (ASC) to check unused NH3 emission in SCR. Keywords: Selective Catalytic Reduction (SCR), NOx, Space Velocity (SV), Ammonia to NOx Ratio (ANR), Ammonia Slip Catalyst (ASC), Diesel Exhaust Fluid (DEF), World Harmonized Stationary Cycle (WHSC), World Harmonized Transient Cycle (WHTC), Not-To-Exceed (NTE) Testing