1.School of Energy and Power Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2.Internal Combustion Engine Research Institute, College of Zhenjiang Watercraft, Zhenjiang, Jiangsu 212003, China
Abstract：The numerical model of a diesel UreaSCR aftertreatment system was set up by the methods of CFD and chemical reaction dynamic. Based on the FIRE software, the distribution and the internal flow characteristics of urea droplets in a UreaSCR catalyst system were analyzed under three typical operating conditions, and the effects of ghsv and NO2 content on NOx conversion efficiency were specially investigated. The results show that the NOx conversion efficiency is reduced with the increasing of ghsv. When the ghsv is faster than 35 000 h-1, the conversion efficiency is lower than 25%. With the increasing of ratio of V(NO2)/V(NOx), the NOx conversion efficiency is increased with latter decreasing. When the ratio of V(NO2)/V(NOx) is controlled at about 0.5, the maximum NOx conversion efficiencies are 50% and 59% under the working conditions of A25 and B50, respectively.
2016, Vol. 37 
