江苏大学学报（自然科学版）2011，Vol.32Issue(1)：38-42,5.DOI:10.3969/j.issn.1671-7775.2011.01.008
装配SCR系统的城市公交车NOx排放特性
Characters of NOx emission from transit bus with SCR
摘要
Abstract
The emission test on four different vehicles was conducted by using on-board test system. Based on the theory of SCR, the reason of higher NOx emission from State Ⅳ conventional bus and hybrid bus equiped with SCR was analysed. By combining the data from the test and the methods of 'idle' and 'segment', the relationship between exhaust temperature and NOx emission was studied. The results show that the use of SCR technology can reduce NOx emissions to a certain extent. When the exhaust temperature is between 130 ℃ and 230 ℃, the NOx conversion efficiency increases about 6％ with temperature increase of about 10 ℃. For transit bus with SCR, especially HEV, the proportion of the exhaust temperature above 230 ℃ is very small, which causes the lower conversion efficiency and higher NOx emission. Some technology (e. g. exhaust heating system) should be used or the transformation efficiency under low temperature should be increased.关键词
城市公交车/SCR/混合动力车/排气温度/NOx分类
交通工程引用本文复制引用
李孟良,聂彦鑫,徐俊芳,秦孔健,景晓军..装配SCR系统的城市公交车NOx排放特性[J].江苏大学学报（自然科学版）,2011,32(1):38-42,5.基金项目
国家"863"计划项目(2007AA11A131) （2007AA11A131）
