Numerical Simulation on Spray Atomization Characteristics and Mixing Performances for SCR System in a Marine Diesel
In practical applications, NOx removal efficiency and urea consumption rate of SCR system are strongly dependent on the spray atomization and mixing process of reducing agent in the exhaust gas. On the basis of computational fluid dynamics (CFD) coupled with chemical reaction kinetics, spray atomization characteristics and mixing performances for a SCR system in the marine diesel are studied in the paper. It is found that a uniform mixing of urea solution in the exhaust flow cannot be achieved by the limitation of large scales and high flow rates of marine diesel exhaust systems. However, the mixing performances can be enhanced obviously by the installation of multilayer mixer in the exhaust upstream of the catalyst. It is also proved that the calculated value of DeNOx rate of the marine diesel at full load is very close to the measured rate-91% at 5.3 gallons per hour of urea solution consumption rate, and working performances of the SCR system can be predicted well by the model built in the paper.
Zhu Yuanqing Zhou Song Gao Lin
Harbin Engineering University,China Jiangsu Nuclear Power Corporation,China
国际会议
上海
英文
1-6
2013-05-13（万方平台首次上网日期，不代表论文的发表时间）