Study on Influence Factors of NOx Conversion Efficiency of Diesel Urea-SCR System
This paper provides an overview of the mechanism of urea selective catalytic reduction (Urea-SCR) technology and the basic chemical reactions. Based on bench test, numerical calculation in different engine operating conditions is carried out. The effect of exhaust temperature, ammonia ratio and space velocity on conversion efficiency is studied through numerical simulation software. With the numerical calculation, the effect of ammonia ratio on de-NOx rate is obtained, with which the maximum conversion rate in specified conditions of diesel engine can be quickly determined to control the ammonia leakage in the lowest range. NOx conversion rate increases at first and then declines with exhaust temperature rising. The conversion efficiency reduces with the increase of space velocity and changes with exhaust temperature.
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