炼油厂分季节VOCs组成及其臭氧生成潜势分析

Refinery VOCs Seasonal Composition and Analysis of Ozone Formation Potential

为了解石化炼油厂地区的VOCs化学物种的浓度特征,在炼油厂厂界开展了为期5个月的VOCs样品采集分析工作,获得了不同季节炼油厂厂界VOCs化学组分的体积分数.研究发现:在检出的50余种VOCs中,C3～C8化合物占总体积分数的80%以上,其中烷烃贡献在50%以上.此外,研究利用最大增量反应活性法对石化炼油厂排放的VOCs臭氧生成敏感性特征进行了量化分析,计算获得各VOCs物种的臭氧生成潜势,结果表明:虽然炼油厂厂界的烷烃体积分数比烯烃高,但炼油厂厂界大气臭氧生成潜势最大是烯烃,其对炼油厂厂界臭氧的生成贡献在53%以上.

In order to understand the concentration characteristics of VOCs species emitted from crude oil refinery, VOCs were sampled at the boundary of a refinery from May to September in 2011 by using SUMMA canisters, and then were analyzed by gas chromatography-mass spectrometry（GC-MS） to get the mixing ratio of each VOC in the boundary area in spring, summer and autumn. Finally, about 50 VOCs species were detected, C3-C8 hydrocarbons accounting for more than 80% of the total VOCs in volume, in which alkenes with the volume contribution of more than 50%. In addition, maximum increment reactivity （MIR） was used to quantify the ozone formation potential of various VOCs species emitted from the refinery. The results showed that although the volume percentage of alkanes was much higher than that of alkenes in the refinery boundary, alkenes had the maximum photochemical ozone formation potential, which contributed over 53% in the ability of ozone formation by all VOCs sepcies.