汽车尾气与大气光化反应中气固态污染物演变规律

发布时间：2018-04-01 18:32

本文选题：汽车尾气　切入点：大气　出处：《江苏大学学报(自然科学版)》2017年06期

【摘要】：利用烟雾箱系统,在不同温湿环境下进行了汽车尾气与大气的光化反应试验,通过检测反应中不同时刻气态固态物浓度,揭示尾气与大气光化反应中不同气固态物的演变规律.结果表明:在尾气与大气的光化反应中,气态物NO及HC主要来自于尾气,NO_2及O_3主要为新生成的产物,而固态物PM2.5主要是二次颗粒物;随着反应时间增加,NO及HC体积分数下降,其下降速率与温湿度分别呈负相关及正相关,而NO_2,O_3体积分数及PM2.5质量浓度先迅速增加,后趋于平稳,且增长速率与湿度正相关;与温度相比,湿度对污染物浓度变化的影响更大;尾气与大气作用生成二次颗粒物的主要时段是最初的1.5 h,且尾气体积分数越高越有利于二次颗粒物的生成,柴油车在大气中形成的二次颗粒物多于汽油车.
[Abstract]:The photochemical reaction test of automobile exhaust gas with atmosphere was carried out in different temperature and humidity environment by using smoke box system. The concentration of gaseous solid matter at different time in the reaction was measured. The evolution of different gaseous solids in the photochemical reaction between tail gas and atmosphere is revealed. The results show that the gaseous no and HC mainly come from the tail gas no 2 and O 3, which are mainly new products in the photochemical reaction between the tail gas and the atmosphere. However, the volume fraction of no and HC decreased with the increase of reaction time, and the decreasing rate was negatively and positively correlated with temperature and humidity, while the volume fraction of no _ 2O _ 3 and the mass concentration of PM2.5 increased rapidly and then became stable with the increase of reaction time. The growth rate was positively correlated with humidity, and the influence of humidity on the concentration of pollutants was greater than that of temperature. The main time of secondary particulate formation by the interaction of tail gas and atmosphere is 1.5 h, and the higher the integral number of tail gas is, the more secondary particulates are generated in the atmosphere, and the more secondary particles are formed in diesel vehicles than in gasoline vehicles.
【作者单位】：南通大学机械工程学院;南通大学地理科学学院;
【基金】：国家自然科学基金资助项目(51376095) 江苏省环保科研课题项目(2014049)
【分类号】：X51;X734.2

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