發(fā)布時間：2018-04-01 18:32

  本文選題：汽車尾氣　切入點：大氣　出處：《江蘇大學學報(自然科學版)》2017年06期

【摘要】：利用煙霧箱系統(tǒng),在不同溫濕環(huán)境下進行了汽車尾氣與大氣的光化反應試驗,通過檢測反應中不同時刻氣態(tài)固態(tài)物濃度,揭示尾氣與大氣光化反應中不同氣固態(tài)物的演變規(guī)律.結果表明:在尾氣與大氣的光化反應中,氣態(tài)物NO及HC主要來自于尾氣,NO_2及O_3主要為新生成的產(chǎn)物,而固態(tài)物PM2.5主要是二次顆粒物;隨著反應時間增加,NO及HC體積分數(shù)下降,其下降速率與溫濕度分別呈負相關及正相關,而NO_2,O_3體積分數(shù)及PM2.5質(zhì)量濃度先迅速增加,后趨于平穩(wěn),且增長速率與濕度正相關;與溫度相比,濕度對污染物濃度變化的影響更大;尾氣與大氣作用生成二次顆粒物的主要時段是最初的1.5 h,且尾氣體積分數(shù)越高越有利于二次顆粒物的生成,柴油車在大氣中形成的二次顆粒物多于汽油車.
[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.
【作者單位】： 南通大學機械工程學院;南通大學地理科學學院;
【基金】：國家自然科學基金資助項目(51376095) 江蘇省環(huán)�？蒲姓n題項目(2014049)
【分類號】：X51;X734.2

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本文編號：1696753