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对某炼油石化厂进行了O_3体积分数和VOCs的监测分析,获得炼油厂周边地区各月O_3的体积分数变化特征和日O_3体积分数变化特征。研究发现,该炼油厂地区O_3体积分数经常超过国家二级标准,说明该地区O_3污染严重。该地区O_3日变化曲线不同于所在城市中心的O_3变化特征。炼油厂地区O_3体积分数在6—8月显示出双峰特性以及更长的最大值持续时间。与此同时,在5月、9月、10月使用SUMMA采样罐在炼油厂厂界进行VOCs样品采集,使用气相色谱质谱联用仪(GC-MS)对样品进行分析,得到厂界VOCs各组分的体积分数,烷烃比例最高,约82.6%,其中直链烷烃占49.9%,而芳香烃和烯烃仅为10.2%和7.5%。VOCs监测结果与文献相近,烯烃排放量略低。此外,为了对炼油石化厂排放的VOCs各物种敏感性特征进行量化描述,利用丙烯等效浓度法,对炼油厂区域各VOCs物种的反应活性进行了归一化研究,量化了该地区各物种的反应活性,获得了综合反应活性较强的5种烯烃、4种直链烷烃和1种环烷烃。
O3 volume fraction and VOCs were monitored and analyzed in a refinery and petrochemical plant. The volume fraction of O_3 and the change of volume fraction of O_3 in the surrounding area of the refinery were obtained. The study found that the volume fraction of O_3 in the refinery often exceeds the national secondary standard, indicating that the O_3 pollution in the area is serious. The O3 daily change in the area is similar to the O3 change in the cities. The O 3 volume fraction in the refinery region showed a bimodal characteristic as well as a longer maximum duration in June-August. In the meantime, samples of VOCs were collected at the refinery site using SUMMA sampling tanks in May, September and October. Samples were analyzed by gas chromatography mass spectrometry (GC-MS) to obtain groups of VOCs The volume fraction of alkanes, the highest proportion of alkanes, about 82.6%, of which 49.9% of straight-chain alkanes, and aromatic hydrocarbons and olefins only 10.2% and 7.5%. VOCs monitoring results are similar to the literature with slightly lower olefin emissions. In addition, in order to quantitatively describe the sensitivity characteristics of VOCs emitted from refinery petrochemical plants, the propylene equivalent concentration method was used to normalize the reactivity of each VOCs species in the refinery area, Reactivity, to obtain a comprehensive reactivity of the five olefins, four straight-chain paraffins and a cycloalkane.