SCR对柴油机炭烟纳观结构及氧化活性的影响  

Effects of SCR on Nanostructure and Oxidation Activity ofDiesel Exhaust Soot

作　　者：郝斌 张华伟 张清茂 杨振中[2] 王丽君[2] HAO Bin;ZHANG Huawei;ZHANG Qingmao;YANG Zhenzhong;WANG Lijun(Zhengzhou Yutong Bus Co.,Ltd.,Zhengzhou 450016,China;North China University of Water Resources and Electric Power,Zhengzhou 450045,China;Geely Automobile Research Institute(Ningbo)Co.,Ltd.,Ningbo 315336,China)

机构地区：[1]郑州宇通客车股份有限公司,郑州450016 [2]华北水利水电大学,郑州450045 [3]吉利汽车研究院(宁波)有限公司,浙江宁波315336

出　　处：《拖拉机与农用运输车》2020年第4期30-35,共6页Tractor & Farm Transporter

基　　金：河南省高等学校重点科研项目(20A470008);河南省重点研发与推广专项(2212);河南省高校科技创新团队支持计划资助(19IRTSTHN011)。

摘　　要：研究选择性催化还原(selective catalytic reduction,SCR)对柴油机炭烟纳观结构和氧化活性的影响,结果表明:SCR处理前,炭烟微晶长度(L)随负荷增加而提高,随转速增加而减小,微晶层间距(D)、微晶曲率(T)及表观活化能(E a)的变化规律与之相反。排气无NH 3时,SCR处理后,炭烟L提高,D、T和E a均降低,且L、D、T和E a变化率随转速提高而减小,随负荷增加而增大;排气有NH 3时,SCR处理后,L、D、T和E a的变化率均减小;SCR对炭烟纳观结构参数与E a相关性影响不大。This study investigated the effects of selective catalytic reduction(SCR)on the nanostructure and oxidative activity of diesel exhaust soot.The results show that the raw soot that sampled at the pre-SCR site tends to exhibit larger fringe length(L)at high engine load,while the values of L becomes smaller with the increased engine speed.However,the values of separation distance(D),tortuosity(T)and apparent activation energy(E a)show opposite trends compared with the trends of L while varying the engine operating condition.The SCR treatment without ammonia(NH 3)addition increases L and decreases D,T and E a.In addition,the rates of change become smaller with the increase in engine speed and they become larger with the increase in engine load.The SCR treatment with NH 3 addition decreases the rates of change for the values of L,D,T,E a.The SCR treatment exerts negligible effect on the correlation between nanostructure parameters and oxidative reactivity.

关 键 词：柴油机 选择性催化还原 炭烟 纳观结构 氧化活性 

分 类 号：TK421.5[动力工程及工程热物理—动力机械及工程]