某石化工业园区大气中VOCs垂直分布的无人机监测研究

Vertical Distribution Characteristics of VOCs in a Petrochemical Industrial Park Monitoring by UAV

利用无人机对某石化工业园区地面至100 m大气中的VOCs进行监测,通过不同高度数据对比,总结该石化工业园区挥发性有机物的垂直分布特征,并分析其化学反应活性。监测结果表明,VOCs体积分数和总臭氧生成潜势随高度增加均呈下降趋势,地面和15~30 m高度的VOCs浓度及臭氧生成潜势基本一致。主要VOCs物种浓度垂直分布特征可分为均匀分布、随高度增加浓度不断降低、随高度增加浓度先升后降3种。含氧有机物和烷烃在大气中体积分数较大,主要特征挥发性有机物为丙酮、乙醛、乙烷、乙醇等;臭氧生成潜势贡献较大的组分为含氧有机物、烯烃和炔烃,关键活性物质为甲醛、乙醛、丁烯醛、正丁醛等。含氧有机物的体积分数和臭氧生成潜势贡献在地面至100 m高度都明显高于其他组分,应作为VOCs浓度和化学活性控制的重点。

The volatile organic carbons(VOCs)in the ambient air from ground to 100m height were monitored in a petrochemical industrial park by UAV.The vertical distribution characteristics and atmospheric chemical reactivity of VOCs were analyzed.VOCs concentration and total OFP showed a decrease trend with the increase of altitude,and the VOCs concentration and OFP were basically the same at ground level and 15-30 m height.The vertical distribution characteristics of key VOCs species can be divided into three types:uniform distribution,concentration decreasing with height,concentration increasing first and then decreasing with height.Oxygenated Volatile Organic Compounds(OVOCs)and alkane were the main VOCs components in the atmosphere,and the main characteristic VOCs species were acetone,acetaldehyde,ethane,ethanol,etc.The main contribution components to OFP were OVOCs and alkynes,and the key active species were formaldehyde,acetaldehyde,butyraldehyde,etc.The results showed that OVOCs had higher volume concentration and OFP contribution than other components from ground to 100 m height,which should be considered as the key point of VOCs pollution and photochemical activity control.