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为控制炼焦排放以及为预防城市大气污染提供可靠的污染源数据支持,利用不锈钢采样罐和全自动预浓缩/GC/MS系统,研究了58-Ⅱ型和JN43-80型焦炉在装煤时刻和炼焦过程(包括装煤时刻)中挥发有机物(VOCs)的排放特征及其组成分布,分析了焦化行业排放VOCs的反应活性。研究发现,在装煤时刻和炼焦过程中,58-Ⅱ型焦炉产生的总挥发性有机物(TVOCs)浓度分别为7022μg/m~3和6266μg/m~3;JN43-80型焦炉产生的TVOCs浓度分别为4185μg/m~3和3298μg/m~3。装煤时刻产生的TVOCs浓度明显高于炼焦过程产生的。炼焦过程无组织排放的VOCs包含烯烃、烷烃、芳香烃、卤代烃以及少量的醛和酮,其中乙烯、乙烷、丙烯、苯、甲苯等为主要成分。这些产生的VOCs反应活性各不相同,活性最大的是烯烃类物质,其活性占TVOCs反应活性比重为(86.2±2.1)%;其次是芳香烃类物质,其活性比重为(9.2±3.1)%;反应活性最大的5个物种分别是丙烯、乙烯、1,3-丁二烯、1-丁烯以及苯乙烯。
In order to control the coking emissions and provide reliable source of pollution data for the prevention of urban air pollution, the effects of 58- ¢ ò and JN43-80 coke oven on the coal loading time and Emission characteristics and composition distribution of volatile organic compounds (VOCs) in the coking process (including coal charging time) were analyzed, and the reactivity of VOCs emitted by the coking industry was analyzed. The results showed that the total volatile organic compounds (TVOCs) produced by the 58-II coke oven were 7022μg / m 3 and 6266μg / m 3 respectively at the charging time and coking process. The production of JN43-80 coke oven TVOCs concentrations were 4185μg / m ~ 3 and 3298μg / m ~ 3 respectively. The concentration of TVOCs produced at the moment of charging is significantly higher than that produced by the coking process. The unorganized VOCs in the coking process contain olefins, alkanes, aromatic hydrocarbons, halogenated hydrocarbons and small amounts of aldehydes and ketones, with ethylene, ethane, propylene, benzene and toluene as the major components. These VOCs produced different activity, the most active species were olefins, the activity of which accounted for 86.2 ± 2.1% of the TVOCs reactivity, followed by aromatic hydrocarbons with the activity of 9.2 ± 3.1% The five species with the highest reactivity were propylene, ethylene, 1,3-butadiene, 1-butene and styrene.