化工园区挥发性有机物排放清单及其环境影响

摘要

以珠三角某化工园区为对象,利用监测计算法和排放系数法结合计算了园区内企业的挥发性有机物(VOCs)排放量,编制了分物种的VOCs排放清单,并利用该清单估算了VOCs的臭氧生成潜势(OFP)和二次有机气溶胶生成潜势,分析了该园区VOCs排放对大气环境的影响.结果表明:园区VOCs排放总量为9118.61t,单个企业排放量为2.98~4176.97t不等,园区内共监测到58种VOCs物种,排放量前3位的物种为乙二醇、丙酸甲酯和二甲苯,3者占园区VOCs排放总量的52.3%.该园区OFP总量为27733.42t,其中贡献量最大的企业为ZR储运,占该园区OFP总量的45.90%.园区内对OFP贡献最大的前10物种是二甲苯、乙二醇、甲苯、2-丙基-1-戊醇、癸醛、三甲苯、辛醇、丙酸甲酯、壬醛、和2,4-二甲苯酚,对OFP的贡献达到94.11%.园区二次有机气溶胶(SOA)生成潜势总量为11187.41×10-2t,其中贡献量最大的企业仍为ZR储运,占园区SOA生成潜势总量的37.25%.园区内对SOA生成潜势贡献最大的前10物种有二甲苯、甲苯、2,4-二甲苯酚、乙苯、三甲苯、叔丁苯、异丙苯、仲丁苯、甲基叔丁基醚和二十烷, SOA生成潜势的贡献为98.93%.利用VOCs排放清单和最大增量反应活性(MIR)计算法以及气溶胶生成系数(FAC)计算法估算区域OFP和SOA生成潜势有助于精确了解区域的污染情况,对于制定相应的VOCs减排政策起到重要作用.%Speciated VOCs emission inventory of a chemical industry park in the PRD area was developed by field monitoring and emission factors.Then the ozone formation potential (OFP) and the secondary organic aerosols (SOA) formation potential were estimated to assess the influence of VOCs emission on the atmospheric environment. Total emissions of VOCs in the park was 9118.61t, and the emissions of each enterprise ranged from 2.98t to 4176.97t. There were 58kinds of VOCs in the park. The top 3species were ethylene glycol, methyl propionate and xylene, which contributed 52.3% to the total VOCs emissions. The total OFP in the park was 27733.42t, of which the largest contributor was ZR storage and transportation Co. Ltd, accounting for 45.90%. The top 10OFP species in the park were xylene, ethylene glycol, toluene, 2-propyl-1-pentanol, decanal, trimethylbenzene, octanol, methyl propionate, nonanal and 2,4-dimethyl phenol, which contributed 94.11% to the total OFP. The total SOA formation potential in the park was 11187.41 × 10-2 t, and the largest contributor was ZR, accounting for 37.25%. The top 10SOA formation potential species in the park were xylene, toluene, 2,4-dimethyl phenol, ethylbenzene, trimethylbenzene, tert-butylbenzene, cumene, sec-butylbenzene, methyl tert-butyl ether and eicosane. They contributed 98.93% for the total SOA formation potential. Using VOCs emission inventory and MIR and FAC to estimate the regional OFP and SOA formation potential helps us to comprehend the regional pollution accurately, and it plays a significant role in formulating VOCs emission reduction policies.