烧结过程挥发性有机物排放特性  

Characterization of volatile organic compounds emission from sintering process

作　　者：王毅璠 于清海 李亚飞 罗云飞 丁龙 李永涛 龙红明 WANG Yifan;YU Qinghai;LI Yafei;LUO Yunfei;DING Long;LI Yongtao;LONG Hongming(School of Meterials Science and Engineering,Anhui University of Technology,Maanshan 243002,Anhui,China;School of Metallurgical Engineering,Anhui University of Technology,Maanshan 243002,Anhui,China;Anhui Province Key Laboratory of Metallurgy Engineering and Resources Recycling,Maanshan 243002,Anhui,China)

机构地区：[1]安徽工业大学材料科学与工程学院,安徽马鞍山243032 [2]安徽工业大学冶金工程学院,安徽马鞍山243032 [3]冶金工程与资源综合利用安徽省重点实验室,安徽马鞍山243002

出　　处：《钢铁》2025年第3期156-165,共10页Iron and Steel

基　　金：国家资助博士后人员计划资助项目(GZC20230016)。

摘　　要：铁矿烧结过程主要依赖焦煤提供能量,导致烧结烟气中挥发性有机物大量排放,对大气环境和人体健康产生危害。当前研究主要对烧结烟气中挥发性有机物(VOCs)排放总量和组分进行研究,但缺乏对烧结过程各阶段VOCs排放特征的研究。结合烧结杯试验及烧结机风箱支管的VOCs排放情况,探究了烧结过程VOCs排放特性,研究了煤粉和焦粉对VOCs排放规律的影响,分析了不同燃料结构对VOCs排放的影响。研究结果表明,烧结过程的VOCs会持续排放,不同烧结机由于工艺参数差别,VOCs排放质量浓度为100~200 mg/m^(3)。其中,非甲烷总烃(NMHC)质量浓度约占VOCs的10%。烧结过程VOCs释放分为4个阶段,第Ⅰ阶段VOCs的含量较高,主要来源于烧结点火气体的不完全燃烧。第Ⅱ阶段VOCs排放浓度略有升高,但整体较为稳定。第Ⅲ阶段烧结过湿层消失,VOCs的含量显著降低,被过湿层吸附的NMHC集中排放。第Ⅳ阶段,烧结周期结束,VOCs含量趋近于0。以焦粉为燃料的烧结烟气VOCs总量和NMHC含量显著低于煤粉,但以焦粉为燃料时,烧结烟气中NMHC含量在VOCs总量中所占比例较高。NMHC的主要成分包括甲苯、乳酸乙酯、苯、丙酮、正乙烷等,芳香族化合物是NMHC的主要成分。针对性地研究了烧结矿生产过程中4个阶段VOCs、TVOCs和NMHC的排放浓度和规律,说明了铁矿石烧结中VOCs的主要来源,可为烧结矿生产现场的VOCs减排工作提供指导。The iron ore sintering process primarily depends on coke and coal for energy,leading to significant emissions of volatile organic compounds(VOCs)in the sintering flue gas.These emissions pose risks to both the atmospheric environment and human health.Current research has mainly focused on the total emissions and composition of VOCs in sintering flue gas,but there is limited research on the emission characteristics of VOCs during the sintering process.Utilizing sintering pot experiments and VOC emissions from the windbox ducts of a sintering machine,the characteristics of VOC emissions during the sintering process were investigated.It explored the impact of pulverized coal and coke on VOC emission patterns and assessed the effect of fuel structures on VOC emissions.The findings show that VOCs are emitted continuously throughout the sintering process,with emission concentrations ranging from 100 to 200 mg/m^(3),attributable to variations in process parameters among different sintering machines.Non-methane hydrocarbons(NMHCs)constitute approximately 10%of the total VOC mass concentration.The release of VOCs in the sintering process can be categorized into four stages.In stage I,VOC levels are relatively high,primarily due to the incomplete combustion of ignition gas.In stage II,VOC emission concentrations increase slightly but remain relatively stable.In stage III.as the over-wet zone in the sinter bed disappears,VOC levels decrease significantly,and NMHCs absorbed in the over-wet zone are released in high concentrations.In stage IV,the sintering cycle concludes,and VOC levels approach zero.When using coke as fuel,the total VOC and NMHC concentrations in the sintering flue gas are significantly lower compared to pulverized coal.However,the proportion of NMHCs within the total VOC emissions is higher when coke is used.The primary components of NMHCs include toluene,ethyl lactate,benzene,acetone,and n-pentane,with aromatic compounds being the dominant constituents.It specifically examines the emission concentrations a

关 键 词：铁矿石烧结 烧结杯 烧结机 烧结烟气 挥发性有机物(VOCs) 非甲烷总烃 排放特性 VOCs检测 

分 类 号：X51[环境科学与工程—环境工程]