江苏省人为源VOCs排放清单及其对臭氧生成贡献

基于江苏省工业、能源、环境等活动水平数据,结合排放因子法和源成分谱研究成果,建立了江苏省分市、分行业、分物种人为源VOCs排放清单,利用最大增量反应活性(MIR)估算了其对臭氧的生成贡献.结果显示,江苏省2015年VOCs人为源排放量为192.78万t,化石燃料燃烧、工业过程源、有机溶剂使用源、生物质燃烧源、移动源、有机溶剂储运源排放质量分数分别为7.38%、27.93%、39.56%、3.55%、16.18%、5.39%.苏州、南京、徐州3市VOCs排放量居全省前三位,均超过20万t.56种臭氧前驱物所产生的臭氧生成潜势(OFP)总量为542.95万t,行业分布与VOCs排放总量的行业分布相似,机械设备制造、交通工具制造、建筑装饰等涂装行业对OFP的贡献比例是VOCs排放总量贡献比例的1.3~1.6倍,控制喷涂行业等量的VOCs会产生更大的OFP削减.对OFP贡献大的前10位物种分别是间/对-二甲苯、乙烯、丙烯、1,3-丁二烯、甲苯、邻-二甲苯、1-丁烯、乙苯、1,2,4-三甲基苯、对-乙基甲苯,对总OFP的贡献为75.63%.

Emission Inventory of Anthropogenically Sourced VOCs and Its Contribution to Ozone Formation in Jiangsu Province

Based on statistical activity data, emission factors, and source profiles, an emission inventory of anthropogenic-speciated VOCs in Jiangsu province in 2015 was calculated. The ozone formation potential (OFP) of VOCs was estimated by the maximum incremental reactivity (MIR). The result showed that the total anthropogenic emission amount of VOCs in Jiangsu Province was 1927.8 kt in 2015. Fossil fuel combustion, industrial processes, solvent utilization, biomass burning, vehicles, and storage and transport contributed 7.38%, 27.93%, 39.56%, 3.55%, 16.18%, and 5.39%, respectively. Suzhou, Nanjing, and Xuzhou were the three cities with the highest amount, contributing more than 200 kt of VOCs. The total amount of OFP from 56 ozone-precursor VOCs was 5429.5 kt. The contribution to OFP from the equipment manufacturing, vehicles manufacturing and building decoration was 30%-60% more than their contribution to the emissions. The coating VOC reduction would be more efficient for alleviating O₃ pollution. The 10 VOC species with the largest OFP contribution were m/p-xylene, ethylene, propylene, 1,3-butadiene, toluene, o-xylene, 1-butene, ethylbenzene, 1,2,4-trimethylbenzene, and p-ethyltoluene, which contributed 75.63% of the total OFP.