3D Numerical Modeling of Urea Spray Characteristics in a Urea-SCR Reactor with Zeolite-based Catalyst

다국어 초록 (Multilingual Abstract)

The selective catalytic reduction(SCR) is an effective technique to reduce nitrogen oxides (NOx) emitted from engines. A three dimensional numerical modeling of urea spray characteristics and their interaction with the exhaust gas flow is developed to evaluate different configurations during development process of a urea-SCR reactor with zeolite-based catalyst. In this study, the change of urea spray angle and the numbers of urea injector hole have been examined by the numerical simulation. The results show that the urea injector with 90° spray angle has the most amount of ammonia conversion effeciency at the entrance of SCR reactor and also the atomization and evaporation of urea droplets are the best. This is because the droplets spread more uniformly and widely than those of other various spray angles. It is also found that the urea injector with four-hole shows better uniformity than that with two-hole of axial direction injection because the exhaust gases are well mixed with the aqueous urea solution. On the other hand, the atomization efficiency of the urea injector with two-hole is decreased compare to the four-hole injector because the sprayed urea droplets are concentrated on the center region of the exhaust gas inlet and also don"t spread evenly.

목차 (Table of Contents)

• Abstract
• 1. INTRODUCTION
• 2. NUMERICAL ANALYSES
• 3. RESULTS AND DISCUSSION
• 4. CONCLUSIONS
• ACKNOWLEDGMENT
• REFERENCES