Modeling and simulation of SCR system for diesel engines

Selective Catalytic Reduction (SCR) is a method of reducing oxides of nitrogen (NOx) emissions from diesel engines by catalytic reaction. Based on AMESim software, 1D and 2D SCR system models for diesel engines are established and simulated. The results show that both two models are available for the performance study of SCR system, and the 2D model matches the experiment results better, which is adopted in the study of NOx conversion ratio and NH³ leakage at different exhaust temperature. NOx conversion ratio continuously increases with the exhaust temperature, and the increase is slow at first, then rapid, and stable at last. Besides, the rising of the exhaust temperature will lead to decease of the NH³ leakage.