Simulation and verification of NOX conversion rate of diesel engine SCR system based on AMESim
In order to study the influencing factors of SCR system catalytic conversion efficiency of vehicle diesel engine,a SCR system simulation model was established by using AMESim software.Combined with bench test,the influence of exhaust temperature,NO2/NOX value and exhaust flow rate on the system NOX conversion rate was analyzed.The NOX conversion data of SCR system simulation output at different temperatures were verified by experiments,and the results showed that the prediction error of the model was less than 5%.The simulation results showed that the NOX conversion rate of SCR system would increase significantly with the increase of exhaust temperature.370～450℃was the best temperature range for system performance,and the maximum NOX conversion rate was above 88%.NOX conversion rate increased with the increase of NO2/NOX value,and reached the peak when NO2/NOX value was 55%～60%.When the exhaust temperature was 400～450℃,the NOX conversion rate was less affected by the exhaust flow,and the conversion rate was stable at about 90%.This study determines the working performance of SCR system under different working conditions of the engine,and provides guidance for the subsequent study of urea injection control.
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