Modeling and simulation of urea-water-solution droplet evaporation and thermolysis processes for SCR systems
A reliable mathematical model of urea-water-solution(UWS) droplet evaporation and thermolysis is developed.The well known Abramzon–Sirignano evaporation model is corrected by introducing an adjustment coefficient considering the different evaporation behaviors of UWS droplet at different ambient tem...
Saved in:
| Published in: | Chinese journal of chemical engineering Vol. 24; no. 8; pp. 1065 - 1073 |
|---|---|
| Main Authors: | , , , , , |
| Format: | Journal Article |
| Language: | English |
| Published: |
Elsevier B.V
01-08-2016
|
| Subjects: | |
| Online Access: | Get full text |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | A reliable mathematical model of urea-water-solution(UWS) droplet evaporation and thermolysis is developed.The well known Abramzon–Sirignano evaporation model is corrected by introducing an adjustment coefficient considering the different evaporation behaviors of UWS droplet at different ambient temperatures. A semidetailed kinetic scheme of urea thermolysis is developed based on Ebrahimian’s work. Sequentially, the evaporation characteristics, decomposition efficiency of a single UWS droplet and deposit formation are simulated. As a result, the relation of evaporation time, relative velocity, exhaust temperature and droplet initial diameter is presented. Synchronously, it indicates that temperature is the decisive factor for urea thermolysis. Different temperatures result in different deposit components, and deposit yield is significantly influenced by temperature and decomposition time. The current work can provide guidance for designing urea injection strategy of SCR systems. |
|---|---|
| Bibliography: | Xubo Gan;Dongwei Yao;Feng Wu;Jiawei Dai;Lai Wei;Xingwen Li;Institute of Power Machinery and Vehicular Engineering, Zhejiang University 11-3270/TQ |
| ISSN: | 1004-9541 2210-321X |
| DOI: | 10.1016/j.cjche.2016.04.026 |