基于氨均匀性对SCR系统性能影响的多通道一维仿真模型构建  

Construction of a multi-channel 1-D simulation model based on the effect of ammonia uniformity on SCR system performance

作　　者：田文龙 罗峰[1] 郎俊宇 马跃晋 李国祥[1] TIAN Wenlong;LUO Feng;LANG Junyu;MA Yuejin;LI Guoxiang(School of Nuclear Science,Energy and Power Engineering,Shandong University,Jinan 250061,China)

机构地区：[1]山东大学核科学与能源动力学院,山东济南250061

出　　处：《内燃机与动力装置》2025年第1期24-31,共8页Internal Combustion Engine & Powerplant

基　　金：山东省重点研发计划项目(2024TSGC0484);山东大学试验室重点项目(SY20232305);教育部产学合作协同育人项目(SDUZHJ〔2024〕2966号)。

摘　　要：为提高全球统一稳态循环(world harmonized steady-state cycle,WHSC)工况中仿真计算的柴油机NO_(x)排放的准确性,分析造成仿真计算和试验测量的柴油机排放中NO_(x)差距过大的原因;提出一种多通道一维仿真模型,分析选择性催化还原(selective catalytic reduction,SCR)系统中氨均匀性对NO_(x)排放的影响。结果表明:传统的一维仿真方法没有考虑氨均匀性对SCR性能的影响是造成仿真计算和试验测量的柴油机NO_(x)排放差距过大的原因;提出的多通道模型可以很好地预测氨均匀性对SCR性能的影响,当氨均匀性为0.95时,仿真计算的NO_(x)排放与试验的误差较小。考虑氨均匀性受工况变动的影响,提出的分段式氨均匀性方法可以进一步降低NO_(x)排放预测误差,将误差控制在2%以内。To enhance the accuracy of NO_(x) emission simulation for diesel engines under the world harmonized steady-state cycle(WHSC),the causes of the significant discrepancy between simulated and experimentally measured NO_(x) emissions in diesel engine exhaust are analyzed.On this basis,a multi-channel one-dimensional simulation model is proposed to investigate the influence of ammonia uniformity on NO_(x) emissions in the selective catalytic reduction(SCR)system.The results demonstrate that the traditional one-dimensional simulation method,which neglects the impact of ammonia uniformity on SCR performance,is the primary reason for the large deviation between simulated and experimentally measured NO_(x) emissions.The multi-channel model proposed in this study effectively predicts the effect of ammonia uniformity on SCR performance.When the ammonia uniformity index reaches 0.95,the error between the simulated NO_(x) emissions and experimental result is significantly reduced.Considering the influence of operating conditions on ammonia uniformity,a segmented ammonia uniformity model is introduced.This approach further reduces the prediction error of NO_(x) emissions,maintaining the error within 2%.

关 键 词：尿素-SCR系统 建模 多通道 氨均匀性 

分 类 号：TK421.5[动力工程及工程热物理—动力机械及工程]