柴油机选择性催化还原后处理系统的数值模拟  

Numerical simulation of SCR exhaust aftertreatment system of diesel

作　　者：陈代金[1] 郑明刚[2] 许伯彦[2] 张现成[2] 

机构地区：[1]山东建筑大学热能工程学院,山东济南250101 [2]山东建筑大学机电工程学院,山东济南250101

出　　处：《山东建筑大学学报》2012年第4期390-392,415,共4页Journal of Shandong Jianzhu University

摘　　要：通过耦合化学反应动力学和计算流体动力学的方法,对以32.5%尿素水为柴油机选择性催化还原系统进行了数值建模。在验证了计算模型可行性的基础上,数值解析了4种尿素水的添加方案对还原系统的影响。结果表明:CFD模拟计算结果与发动机台架试验结果相吻合;采用孔式喷油器进行尿素喷射,氮氧化物还原效率要高于轴针式的;喷油器孔数越多,还原剂分布越均匀;沿着排气管轴线逆向喷射要优于垂直排气管壁喷射。A modeling approach to 32.5% urea water SCR system is presented with aid of CFD coupled with reaction dynamics. On the basis of the feasibility of the model, numerical analysis is made of four different urea addition programs. Results show that the simulation result is consistent with the experimental data. With the hole injection, the NOx reduction efficiency is higher than that with the pintle injection. With more holes, more uniform distribution can be got. The reverse injection along the exhaust pipe axis is superior to the vertical injection.

关 键 词：选择性催化还原(SCR) 数值模拟 32.5%尿素水 氮氧化物 

分 类 号：TK414.5[动力工程及工程热物理—动力机械及工程]