为了研究储运环节VOCs的排放影响,参考HJ 732-2014《固定污染源废气挥发性有机物的采样气袋法》,选择天津临港工业园区某石化业仓储公司为重点监测对象,对企业的厂界上下风向、有组织和无组织排放源进行采样,利用在线仪器PTR-TOF-MS对采集的样品进行VOCs定量分析,并对厂界处O3-NOx-VOCs三者的关系和污染物的臭氧生成潜势进行研究.结果表明:有组织排放源——洗涤塔、活性炭吸附塔1号和2号的Σρ(VOCs)(所有VOCs组分浓度之和)分别为18.91、71.48和5.65mg/m3,无组织排放源——罐组和装卸车台Σρ(VOCs)分别为0.39和0.087 mg/m3;甲醇为企业的特征污染物,此外还有烷烃和少量的烯烃,有组织排放中活性炭吸附塔2号是影响厂界污染特征的主要环节;有组织和无组织VOCs排放量分别为0.57和214.26 t/a.对O3-NOx-VOCs三者关系的分析显示,企业厂界处O3的形成主要受VOCs控制,其臭氧生成潜势为烯烃＞醇类＞烷烃,除考虑醇类的影响外,烯烃也是不可忽视的环境影响因素.%A warehousing company in Tianjin Lingang Industrial Park was selected to study VOC emission characteristics from transportation links.The samples were collected from the upwind and downwind of the plant boundary,as well as the organized and unorganized sources according to the HJ 732-2014 air bag sampling method.The relationships between the concentrations of three pollutants O3-Nox-VOCs at the plant boundary,as well as the ozone formation potential (OFP),were analyzed.Using the online instruments of PTR-TOF-MS to quantitatively analyze the samples,the total VOC emission concentrations of the organized sources of scrubber,activated carbon adsorption tower # 1 and activated carbon adsorption tower #2 were 18.91,71.48 and 5.65 mg/m3,respectively.The total VOC emission concentrations of the unorganized sources of the tank group and the loader station were 0.39 and 0.087 mg/m3.Methanol was the enterprise featured pollutant,as well as alkanes and a small amount of alkenes.The activated carbon adsorption tower #2 was a major part of the impact of the plant boundary pollution characteristics.Organized and unorganized VOC emissions were 0.57 and 214.26 t/a.By analyzing the relationship between the concentrations of the three pollutants (i.e.,O3,Nox and VOCs),O3 was formed mainly by the control of the VOC emissions at the plant boundary.The OFP of the alkenes was the highest,followed by the OFP of alcohol and alkanes.Therefore,in addition to considering the influence of alcohol,the alkenes should not be ignored.
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