Modeling and Simulation of SCR System for Diesel Engines

摘要

Selective Catalytic Reduction (SCR) is a method of reducing oxides of nitrogen (NO_x) 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 NO_x conversion ratio and NH_3 leakage at different exhaust temperature. NO_x 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 NH_3 leakage.