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By using computational fluid dynamics and chemical reaction dynamics method, the mathematical model of
SCR (selective catalytic reduction) system was established. On the basis of the verified feasibility, by CFD numerical
analytical method, the reducing agent inside the catalysts concentration distribution was compared under different added
urea schemes. Jet direction and the form of fuel injector were studied on the basis of the effects of reducing agent
concentration distribution. The simulation result shows good agreement with the experimental data. The simulated results
can be utilized in optimization design of the diesel SCR catalyst.