State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
J Environ Sci (China). 2020 Sep;95:183-189. doi: 10.1016/j.jes.2020.03.018. Epub 2020 May 4.
Coking industry is an important volatile organic compounds (VOCs) emission source in China, however, detailed information on VOCs emissions is lacking. Therefore, we selected a typical mechanized coking plant and collected air samples according to the Emission Standard of Pollutants for Coking Chemical Industry (GB16171-2012). Using gas chromatography-mass spectrometry method, we analyzed the VOCs in the air samples, and applied maximum increment reactivity (MIR) rule to estimate ozone formation potential (OFP) of the VOCs emitted from the coke production. More than 90 VOCs species were detected from the coking plant, including alkanes, alkenes, alkynes, aromatic hydrocarbons, halogenated hydrocarbons and oxygenated VOCs. The concentrations of VOCs (ρ(VOCs)) generated at different stages of the coking process are significantly different. ρ(VOCs) from coke oven chimney had the highest concentration (87.1 mg/m), followed by coke pushing (4.0 mg/m), coal charging (3.3 mg/m) and coke oven tops (1.1 mg/m). VOCs species emitted from the coke production processes were dominated by alkanes and alkenes, but the composition proportions were different at the different stages. Alkenes were the most abundant emission species in flue gases of the coke oven chimney accounting for up to 66% of the total VOCs, while the VOCs emissions from coke pushing and coal charging were dominated by alkanes (36% and 42%, respectively), and the alkanes and alkenes emitted from coke oven top were similar (31% and 29%, respectively). Based on above results, reduction of VOCs emissions from coke oven chimney flue gases is suggested to be an effective measure, especially for alkenes.
焦化行业是中国挥发性有机化合物（VOCs）的重要排放源之一，但有关 VOCs 排放的详细信息却很缺乏。因此，我们选择了一家典型的机械化炼焦厂，并按照《炼焦化学工业污染物排放标准》（GB16171-2012）收集了空气样本。我们采用气相色谱-质谱联用方法分析了空气样本中的 VOCs，并应用最大增量反应活性（MIR）规则来估算炼焦过程中排放的 VOCs 对臭氧形成潜力（OFP）的影响。从炼焦厂中检测到了 90 多种 VOCs 物质，包括烷烃、烯烃、炔烃、芳香烃、卤代烃和含氧 VOCs。不同焦化工艺阶段产生的 VOCs（ρ（VOCs））浓度差异显著。焦炉烟囱产生的 ρ（VOCs）浓度最高（87.1mg/m），其次是推焦（4.0mg/m）、装煤（3.3mg/m）和焦炉炉顶（1.1mg/m）。炼焦过程中排放的 VOCs 物质以烷烃和烯烃为主，但在不同阶段的组成比例有所不同。在焦炉烟囱废气中，烯烃是最丰富的排放物种，占总 VOCs 的 66%，而推焦和装煤过程中的 VOCs 排放则以烷烃为主（分别占 36%和 42%），焦炉炉顶排放的 VOCs 则以烷烃和烯烃为主（分别占 31%和 29%）。基于上述结果，建议采取减少焦炉烟囱废气中 VOCs 排放的措施，特别是针对烯烃。
