Selective catalytic reduction (SCR) has been the main after-treatment systems to control diesel engine NO_x emission in light and heavy duty vehicles. In practical applications, the volume of the SCR system is larger, the initial installation costs are higher, which hinder its widespread use in the real ship. In this paper, a new method of design SCR reactor structure is put forward. In the design process, the performance of the SCR reactor under high, medium and low load is taken into account. In this study, the structural parameters of SCR reactor under high, medium and low loads are respectively optimized by using the Response Surface Methodology (RSM). In this process, the coupling relationship among these structural parameters is considered. The optimal structural parameters of SCR reactor are obtained under different loads. The corresponding optimal structural parameters are verified. The result shows that the errors are within acceptable scope. Then, the optimal structural parameters under each load are brought into other loads to observe the change trend of SCR performance. Through the comparative analysis of the results obtained, the optimum structural parameters of the SCR reactor suitable for the diesel engine are obtained.
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