SCR和EGR联合控制下NOx减排效果分析

彭美春; 陈越; 邹康聪; 黄文伟

doi:10.3969/j.issn.1001-2222.2020.05.014

车用发动机 ›› 2020, Vol. 0 ›› Issue (5) : 87-92. DOI: 10.3969/j.issn.1001-2222.2020.05.014

栏目

SCR和EGR联合控制下NO^_x减排效果分析

彭美春¹，陈越¹，邹康聪¹，黄文伟²

作者信息 +

NO_x Emission Reduction Effect under Joint Control of SCR and EGR

PENG Meichun¹,CHEN Yue¹,ZOU Kangcong¹,HUANG Wenwei²

Author information +

文章历史 +

摘要

为研究重型柴油货车实际运行状态下EGR、SCR控制技术对NO_x排放的影响，开展了车辆RDE试验研究。设计了单EGR、SCR+EGR与无排放控制技术3种配置的车载试验方案。测试车辆沿市区、市郊与高速路况行驶,测试瞬时NO_x排放、车速、排气温度、EGR率、发动机转速与负荷等。分析了NO_x排放与车速、发动机工况、EGR率、排气温度的关系，比较不同排放控制方案下NO_x排放的异同。结果表明：无排放控制技术时，NO_x排放随车速增加而增加；配置EGR+SCR时，NO_x排放随车速增加呈下降趋势，高速区NO_x排气体积分数低于低速区。分析表明，排气温度升高，SCR对NO_x的净化效率提高，EGR率增大NO_x排放降低，低速工况下EGR率最高。EGR、SCR、EGR+SCR 3种控制技术对NO_x的减排率分别在16%，51%，92%以上。

Abstract

The RDE test of a heavyduty diesel truck was carried out in order to study the effects of EGR and SCR control techniques on improving NO_xemission in real conditions. Three test schemes were designed including single EGR, SCR and EGR, and uncontrolled measures. The vehicle ran along the urban, suburb and high way and the instantaneous NO_x emission concentration, vehicle speed, exhaust temperature, EGR rate, engine speed and load were measured. The analysis was conducted to find the relationship between NO_x emission and vehicle speed, engine operating conditions, EGR rate and exhaust temperature, and the comparison was conducted to find the differences of NO_x emission between different control configurations. The results show that NO_x emission increases with the increase of vehicle speed without any emission controls, decreases with the increase of vehicle speed and has a higher concentration in high speed region with EGR and SCR controls. In addition, the high exhaust temperature can lead to a better efficiency of SCR and the increase of EGR rate can also lead to the reduction of NO_x. It is found that the EGR rate is the highest at low speed. The reductions of NO_x emission for EGR, SCR, and EGR and SCR were over 16%, 51% and 92% respectively.

导出引用

彭美春，陈越，邹康聪，黄文伟. SCR和EGR联合控制下NO^_x减排效果分析[J]. 车用发动机. 2020, 0(5): 87-92 https://doi.org/10.3969/j.issn.1001-2222.2020.05.014

PENG Meichun,CHEN Yue,ZOU Kangcong,HUANG Wenwei. NO_x Emission Reduction Effect under Joint Control of SCR and EGR[J]. Vehicle Engine. 2020, 0(5): 87-92 https://doi.org/10.3969/j.issn.1001-2222.2020.05.014