摘要
为满足不断提高的NO_(x)排放及NH_(3)泄漏标准要求,基于氨逃逸催化剂(ammonia slip catalyst,ASC)反应机理,结合反应器试验,分析NH_(3)在ASC上的转化过程及生成产物。通过在NH_(3)氧化生成N_(2)、N_(2)O的反应中引入与NO浓度相关的抑制因子以分配NH_(3)氧化路径,建立ASC动力学模型进行仿真分析,并结合台架试验对模型进行验证。仿真结果表明:反应温度低于350℃时,NH_(3)氧化产物主要为N_(2)和N_(2)O;反应温度为250℃时,生成的N_(2)O体积分数最大;反应温度高于350℃时,NH_(3)的氧化对产物NO_(x)的选择性增加。反应器试验及台架试验结果表明:ASC动力学模型能够预测ASC下游NO_(x)、N_(2)O的体积分数,NH_(3)转化率的预测误差不超过±10%,表明模型能够准确反映ASC试验规律。
To meet the increasingly stringent requirements for NO_(x)emissions and NH_(3)slip,based on the reaction mechanism of ammonia slip catalyst(ASC)combined with reactor tests,the conversion process and products of NH_(3)over ASC are analyzed.By introducing inhibition factors related to NO concentration in the reactions of NH_(3)oxidation to N_(2)and N_(2)O to distribute the NH_(3)oxidation pathways,an ASC kinetic model is established and simulated,and verified by bench tests.The simulation results show that when the reaction temperature is lower than 350℃,the main products of NH_(3)oxidation are N_(2)and N_(2)O;the volume fraction of generated N_(2)0 reaches the maximum at 250℃.When the reaction temperature exceeds 350℃,the selectivity of NH_(3)oxidation products increasing NO_(x)emission.Reactor tests and bench tests indicate that the ASC kinetic model can predict the volume fraction of NO_(x)and N_(2)O downstream of ASC,and the prediction error is no less than±10%for NH_(3)oxidation conversion rate.The model can accurately reflect the experimental characteristics of ASC.
作者
庞斌
闫彩彩
梁恒山
吕志华
代子阳
PANG Bin;YAN Caicai;LIANG Hengshan;LÜZhihua;DAI Ziyang(Weichai Power Co.,Ltd.,Weifang 261061,China;State Key Laboratory of Engine and Powertrain System,Weifang 261061,China)
出处
《内燃机与动力装置》
2026年第1期38-44,55,共8页
Internal Combustion Engine & Powerplant
基金
泰山产业领军人才工程资助项目(牵引车混合动力关键技术开发及应用)。
