二甲醚发动机SCR系统仿真分析与结构优化  

Simulation analysis and structural optimization of SCR system of dimethyl ether engine

作　　者：于多友 吴君华[1] 张凤娇 YU Duoyou;WU Junhua;ZHANG Fengjiao(School of Automobile and Traffic Engineering,Nanjing Forestry University,Nanjing 210037,Jiangsu,China)

机构地区：[1]南京林业大学汽车与交通工程学院,江苏省南京市210037

出　　处：《农业装备与车辆工程》2023年第11期86-90,共5页Agricultural Equipment & Vehicle Engineering

摘　　要：为了更好地对二甲醚发动机SCR催化还原性能进行优化,降低排放尾气中NO_(X)的含量,利用仿真软件Fluent研究SCR催化转化器扩张管扩张角度、催化剂载体长度、催化剂载体间隙、收缩管收缩角度等结构参数对催化转化器内部气体流动均匀性的影响,从而为SCR催化转化器的结构优化提供依据。通过Nelder-Mead算法结合Latin hypercube sampling法选取SCR催化转化器的最优结构参数组合。结果表明:SCR催化转化器最优组合参数结构下催化剂载体前端面气体流动均匀指数为89.94%,比优化前提高5.73%,优化后能够有效提高NO_(X)转化效率。In order to better optimize the catalytic reduction performance of dimethyl ether engine SCR and reduce the NO_(X)content in exhaust gas,simulation software Fluent was used to study the effects of structural parameters such as expansion angle of SCR catalytic converter expansion tube,catalyst carrier length,catalyst carrier gap and contraction tube contraction angle on the uniformity of gas flow inside the catalytic converter.It provided a basis for structure optimization of SCR catalytic converter.Nelder-Mead algorithm combined with Latin hypercube sampling method was used to select the optimal structural parameter combination of SCR catalytic converter.The results showed that the gas flow uniformity index on the front face of the catalyst carrier under the optimal combined SCR catalytic converter parameter structure was 89.94%,which was 5.73%higher than that before optimization.The improvement of the gas flow uniformity after optimization can effectively improve the conversion efficiency of NO_(X).

关 键 词：二甲醚发动机 SCR 仿真分析 优化设计 

分 类 号：TK421.5[动力工程及工程热物理—动力机械及工程]