柴油机催化剂尺寸的仿真改良

Simulation and Improvement of Catalyst Size of Diesel Engine

针对6105AZLD柴油机在85%负荷工况下的排气,利用AV L BO O ST软件,建立了选择性催化系统(SCR)反应过程仿真模型,对影响催化剂催化转换效率的长度、孔密度、壁厚等结构尺寸参数进行了仿真分析。通过分析了解不同参数变化对该系统脱硝率与氨逃逸率的影响,最终得到在体积为0.072m3、长度为0.8m、孔密度为35×35、氨氮比为0.85、壁厚为0.6m m、布置形式为2×2、布置层数为2层时,脱硝率为83%、氨逃逸率为12ppm,满足设计指标。

Aiming at the exhaust of 6105 AZLD diesel engine under 85%load,the simulation model of selective catalytic system(SCR)reaction process was established by using AVL BOOST software,and the simulation analysis was made on the length,pore density,wall thickness and other structural parameters that affect the catalytic conversion efficiency of the catalyst.By analyzing the influence of different parameters on the denitrification rate and ammonia escape rate of the system,it was finally obtained that the denitrification rate and ammonia escape rate were 83%and 12 ppm respectively when the volume was 0.072 m3,the length was 0.8 m,the pore density was 35×35,the ammonia nitrogen ratio was 0.85,the wall thickness was 0.6 mm,the arrangement form was 2×2,and the number of arranged layers was 2,meeting the design target.