京津冀区域人为源VOCs排放特征及管控策略

挥发性有机物(volatile organic compounds, VOCs)是细颗粒物(PM_2.5)与臭氧(O3)的重要前体物，对我国城市复合污染的形成有重要影响，京津冀区域大气污染问题严峻，VOCs排放源类别复杂，且排放量基数大，亟需形成有效的VOCs管控策略.因此选取京津冀区域人为源VOCs排放为研究对象，建立2018年分行业分物种VOCs排放清单，并基于实测与文献调研的行业VOCs成分谱数据，获取各排放源臭氧生成潜势(ozone formation potential, OFP)与二次有机气溶胶生成潜势(secondary organic aerosol formation potential, SOAP)，同时构建VOCs排放源优先控制分级技术方法，计算各排放源分级指数，明确优先控制排放源目标.结果表明：(1)京津冀区域2018年人为源VOCs排放总量为214.0×10⁴ t，其中芳香烃、烷烃与含氧有机物为主要物种.(2)小型客车、工业防护涂料、重型货车、焦化行业是OFP与SOAP的最主要来源.(3)工业防护涂料、小型客车、重型货...

Emission Characteristics and Priority Classification Control of Anthropogenic VOCs Sources in Beijing-Tianjin-Hebei Region

Volatile organic compounds (VOCs) are important precursors of fine particulate matter and ozone, and have a significant impact on the formation of complex pollution in China. The Beijing-Tianjin-Hebei Region is suffering from serious air pollution problem, with complex VOCs sources and large amount of emissions. Thus, it is urgent to form a VOCs control strategy based on atmospheric reactivity. The anthropogenic VOCs emission sources of the Beijing-Tianjin-Hebei Region were taken as the research object, an 2018 emission inventory covering various industries and species was established. The VOCs spectra were obtained from field observations and collection of previous studies. The ozone formation potential (OFP) and secondary organic aerosol formation potential (SOAP) of different sources were thus acquired. The VOCs emission source priority control classification technology method was constructed. The classification index of each emission source was calculated and emission sources for priority control were identified. The results showed that: (1) The total amount of anthropogenic VOCs emissions in the Beijing-Tianjin-Hebei Region in 2018 was 2.140 million tons, and main components were arranged in the order of aromatic hydrocarbons, alkanes and oxygenated organic compounds. (2) Small buses, industrial protective coatings, heavy goods vehicles, coking industry were the predominant sources of OFP and SOAP. (3) The classification index was calculated based on the emissions of various sources, industrial protective coatings, small buses, heavy goods vehicles, coking, steel, heating combustion, biomass combustion ranked in the top. It was indicated that there were certain limitations in formulating control strategies based on the single factor of industry VOCs emissions, OFP and SOAP. In order to achieve the scientific and collaborative prevention and control of PM_2.5 and O₃, it is suggested to strengthen the control of the emission sources obtained based on multi factors.