Kinetics analysis of catalytic processes for marine diesel Urea-SCR system
1.College of Power ＆ Energy Engineering, Harbin Engineering University, Harbin, Heilongjiang 150001, China; 2. Application Engineering Department, Weichai Power Company Limited, Weifang, Shandong 261041, China
Abstract：According to the characteristics of Urea-SCR system, kinetics analysis of catalytic processes for marine diesel Urea-SCR system was carried out by computational fluid dynamics (CFD) coupled with chemical reaction kinetics. Based on 3-dimensional transient model, DeNOx rates and NH3-slips under different urea solution consumption rates, effects of fast SCR reaction on the catalytic processes and distributions of different specie concentrations were discussed. The results show that high DeNOx rate and low NH3-slip are obtained at optimal (NH2)2CO/NOx ratio of 0.475 for high load of marine diesel. The experimental DeNOx rate is consistent with calculated value with error less than 5%. DeNOx rate at high load can be further enhanced by increasing NO2/NO ratio to 1∶1 with obvious decrease of NH3slip.
2012, Vol. 33 
