柴油车固体SCR系统运行及NOx排放特性研究

刘明; 何超; 李加强; 刘学渊; 彭琪凯; 邹浪

doi:10.3969/j.issn.1001-2222.2019.01.009

车用发动机 >

2019 , Vol. 0 >Issue 1: 53 - 57

DOI: https://doi.org/10.3969/j.issn.1001-2222.2019.01.009

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柴油车固体SCR系统运行及NO_x排放特性研究

刘明 ,
何超 ,
李加强 ,
刘学渊 ,
彭琪凯 ,
邹浪

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（西南林业大学汽车与交通学院,云南昆明 650224）

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Solid SCR System Operation and NOx Emission Characteristics of Diesel Vehicle

LIU Ming ,
HE Chao ,
LI Jiaqiang ,
LIU Xueyuan ,
PENG Qikai ,
ZOU Lang

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（School of Vehicle and transportation, Southwest Forestry University,Kunming 650224,China）

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摘要

利用汽车尾气实时监控平台获得了装有固体SCR系统柴油环卫车运行38天共135万条有效实时工况数据和排放数据，分析了固体SCR对柴油车NO_x排放的影响规律。研究结果表明：柴油车城市中行驶平均速度13.45 km/h，90%以上加速度点在±1.5 m/s2范围内波动。该柴油车NO_x平均质量浓度为0.023 g/s，NO_x平均排放因子为4.17 g/km。随着速度升高，NO_x转化率逐渐升高。随着排气温度升高，NO_x转化率逐渐升高，后逐渐趋于平稳，在平均排气温度低于150 ℃时，NO_x平均转化率为61%，表明其能较大程度改善柴油车在排气温度低时的NO_x排放。

关键词： 柴油车; 固体SCR; 排放测量; 氮氧化物

本文引用格式

刘明 , 何超 , 李加强 , 刘学渊 , 彭琪凯 , 邹浪 . 柴油车固体SCR系统运行及NO_x排放特性研究[J]. 车用发动机, 2019 , 0(1) : 53 -57 . DOI: 10.3969/j.issn.1001-2222.2019.01.009

Abstract

A total of 1.35 million effective realtime working and emission data within 38 days for diesel sanitation vehicle with solid SCR system were acquired by using the realtime monitoring platform of automobile exhaust gas. The results show that diesel vehicle runs at an average speed of 13.45 km/h and 90% of acceleration points fluctuates within ±1.5 m/s².The average mass concentration of NO_x is 0.023 g/s and its average emission factor is 4.17 g/km. The NO_xconversion rate increases with the increase of vehicle velocity and increases and then becomes stable with the increase of exhaust temperature. When the average exhaust temperature is lower than 150 ℃，the average conversion rate of NO_x is 61%. Accordingly, the solid SCR system can greatly reduce NO_x emissions of diesel vehicles at low exhaust temperature.

Key words： diesel vehicle; solid SCR; exhaust measurement; nitrogen oxides

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