不同季节西安城市公路隧道主要空气污染物浓度检测及通风潜力预测

Test of Main Air Pollutant Concentration and Prediction of Ventilation Potential in Xi'an Urban Road Tunnel in Different Seasons

通过现场实测西安市文昌门-和平门隧道在春、夏、秋三季晴、阴、雨三种天气条件下隧道内温度、风速、CO和PM_(2.5)的浓度分布状况,并将实测结果与已有的理论模型进行对比验证,然后使用该理论模型对隧道进行通风潜力预测。结果表明:隧道内始终存在较为稳定的活塞风;在春、夏、秋三季隧道内CO浓度值波动范围均保持在2~8 mg/m^3,且从隧道入口到隧道出口逐步升高,PM_(2.5)浓度夏季最低,冬季最高;在晴、阴、雨三种天气条件下,隧道内雨天CO浓度较高,而阴天PM_(2.5)浓度较高;隧道内的风速主要依赖于车速;CO浓度随着车速的降低和车流量的上升逐渐升高,并且在出口处达到最大值分别为14.6 mg/m^3、11.85 mg/m^3。

Through the site observation and monitoring,distribution of temperature,wind speed,CO and concentration of three seasons(in spring,summer,winter)and three kinds of weathers(in sunny,cloudy and rainy day)in Wenchangmen-Hepingmen tunnel.The result indicated that,in three seasons,the range of the CO concentration value is kept in 2-8 mg/m 3,from the tunnel entrance to the tunnel exit;The value of PM 2.5 is lowest in summer and highest in winter;In three kinds of weathers,CO concentration is higher in rainy day and PM 2.5 value is higher in cloudy day;The wind speed in the tunnel mainly depends on the speed vehicle,the concentration of CO increased with the decrease of vehicle speed,CO concentration reaches the highest level when the vehicle speed is 20 km/h,the traffic flow is 6 000 vehs/h,the maximum of CO concentration is 14.6 mg/m 3 and 11.85 mg/m 3 respectively at the exit of the tunnel.