机动车VOCs排放特征和排放因子的隧道测试研究

为了得到真实道路交通状态下的城市机动车排放因子,选取广州珠江隧道,进行了机动车VOCs排放特征和排放因子的隧道实验.实验得到隧道机动车平均排放因子为(0.52±0.07)g·km-1·辆-1,其中轻型车排放因子为(0.32±0.14)g·km-1·辆-1,重型车排放因子为(0.26±0.33)g·km-1·辆-1,摩托车排放因子为(1.16±0.26)g·km-1·辆-1.机动车排放的VOCs中烷烃占39.7%,烯烃和炔烃占35.3%,芳香烃占25.0%.排放物质居前三位的排放因子分别为乙烯(52.9±7.4)mg·km-1·辆-1、异戊烷(41.5±7.0)mg·km-1·辆-1和甲苯(31.7±5.5)mg·km-1·辆-1.隧道实验得到的排放因子与机动车台架实验的结果基本吻合.

Tunnel experimental study on the emission factors of volatile organic compounds (VOCs) from vehicles

Vehicular emissions are among major sources of ambient volatile organic compounds (VOCs) in urban areas. To understand the emission of urban vehicles in a real road traffic situation, the Pearl River tunnel in Guangzhou city was selected, and a tunnel experiment for vehicle VOCs emission characteristics and emission factors were performed. The average VOCs emission factor was (0.52±0.07)g?km-1?veh-1. Alkanes, alkenes (with alkynes), and aromatics account for 39.7%, 35.3% and 25.0% in vehicular VOCs emissions. The emission factors for light duty vehicle, heavy duty vehicle and motorcycle were (0.32±0.14), (0.26±0.33), and (1.16±0.26) g?km-1?veh-1 respectively. The Top 3 VOCs species with the highest emission factors were ethene, isopentane and toluene, their emission factors were (52.9±7.4), (41.5±7.0) and (31.7±5.5)mg?km-1?veh-1. The emission factors found from this tunnel experiment agree well with results obtained by dynamometer experiments.