王文晓，朱智富，赵英良，王胜，桂建华，王继荣.发电柴油机选择性催化还原系统尿素喷雾锥角的仿真及试验研究[J].内燃机工程,2020,41(1):64-69.
发电柴油机选择性催化还原系统尿素喷雾锥角的仿真及试验研究
Simulation and Experimental Study on Urea Spray Cone Angle of Selective Catalytic Reduction System for a Generating Set Diesel Engine
DOI：10.13949/j.cnki.nrjgc.2020.01.009
关键词:发电柴油机  选择性催化还原  计算流体动力学仿真  尿素结晶  喷雾锥角
Key Words:generating diesel engine  selective catalytic reduction（SCR）  computational fluid dynamics simulation  urea crystallization  spray cone angle
基金项目:
作者单位
王文晓，朱智富，赵英良，王胜，桂建华，王继荣 1.青岛大学 机电工程学院,青岛 266000； 2.青岛大学 物理科学学院,青岛 266000； 3.山东康钧环保科技有限公司,潍坊 261000 
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摘要:对大功率发电柴油机选择性催化还原（selective catalytic reduction,SCR）尿素喷雾锥角进行研究。运用计算流体动力学（computational fluid dynamics,CFD）软件模拟了4种不同喷雾锥角尿素混合管内的结晶风险和NH3 分布均匀性,通过分析仿真结果,优选出60°和70°两种喷雾锥角的尿素喷嘴。使用选定的喷雾锥角进行结晶对比试验和性能对比试验。结晶对比试验结果显示,60°喷雾锥角的结晶风险明显低于70°喷雾锥角的结晶风险。性能对比试验结果显示,两种喷雾锥角的NOx 转化效率基本一致。综合分析仿真结果与试验结果,最终将SCR系统的尿素喷雾锥角优化为60°。
Abstract:The urea spray cone angle of a selective catalytic reduction (SCR) system used on a high-power generating set diesel engine was studied. The crystallization risk and NH3 distribution uniformity in an urea mixing pipe with 4 different spray cone angles were simulated by a computational fluid dynamics software. Through the simulation analysis, two kinds of urea nozzles with spray cone angles of 60° and 70° were selected for the crystallization contrast test and performance comparison test. The results of the crystallization contrast test show that the crystallization risk of the 60° spray cone angle is obviously lower than the 70° spray cone angle. The performance comparison test indicates that the NOx conversion efficiencies of the two spray cone angles are basically the same. After the comprehensive analysis of the simulation calculations and test results, the urea spray cone angle of the SCR system is finally optimised to 60°.
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