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Simulation Research on NO_x Catalytic Reduction Reaction in SCR System

Feng Shengjie;Chu Chaomei;Ling Jianqun;School of Mechanical Engineering, University of Shanghai for Science and Technology;  
In order to simulate the influence factors of NO_x conversion efficiency, a computational model for the Selective Catalytic Reduction(SCR) reaction process is established by using the AVL BOOST. The conversion efficiency of NO_x under different temperature,ammonia-nitrogen ratio, air velocity and thermal aging time was tested by sample test, determining the change in the width of the reaction temperature window. The results show that the calculated value of the model is in good agreement with the test result. With the increase of the temperature, the efficiency of NO_x conversion will rise first and then decrease; In the case of reasonable control of ammonia leakage, the conversion efficiency of NO_x can be improved by increasing the ratio of ammonia-nitrogen appropriately; The conversion efficiency of NO_x decreases with the increase of air speed ratio at low temperature; After rapid thermal aging of the catalyst, there is a certain attenuation of performance. The reaction temperature window width is between 240~500 ℃.
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