柴油机SCR催化器NOx转化效率影响因素的数值分析

doi:10.16180/j.cnki.issn1007-7820.2022.06.0014

Abstract

Abstract:

In order to explore the influence of the temperature of cyclone mixer and urea injection flow rate on NO_x conversion efficiency, CFD technology is used to study the SCR catalytic converter for a diesel engine by chemical reaction and steady flow numerical simulation. By changing the temperature of the cyclone mixer and the urea injection flow rate, the concentration and uniformity coefficient of NH₃ and the mass fraction of NO_x at the outlet are compared under different conditions. The results show that the mass fraction distribution of NO_x at the outlet of SCR catalyst presents the law of low center and high edge, and the temperature change of cyclone mixer has little effect on the uniformity coefficient of NH₃velocity. When the temperature is 400 ℃, the NH₃ distribution is more uniform, the NH₃ generation rate and NO_x conversion efficiency are higher. These results indicate that the NO_x conversion efficiency and urea utilization rate can be improved by selecting the appropriate urea injection flow rate.

Key words: diesel engine, SCR, CFD, selective catalytic reduction, numerical modeling, uniformity coefficient, NO_x conversion efficiency, utilization rate of urea

CLC Number:

TP31

ZHAO Hao,HE Wei. Numerical Analysis of NO_x Conversion Efficiency of SCR Catalytic Converter of Diesel Engine[J].Electronic Science and Technology, 2022, 35(6): 89-94.

Figures/Tables 9

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Numerical Analysis of NO_x Conversion Efficiency of SCR Catalytic Converter of Diesel Engine

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Numerical Analysis of NOx Conversion Efficiency of SCR Catalytic Converter of Diesel Engine

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Numerical Analysis of NO_x Conversion Efficiency of SCR Catalytic Converter of Diesel Engine