富氧燃烧烟气中汞的氧化机理研究进展

摘要

Oxy-fuel combustion is the most effective technology in CO2 emission control.The mercury speci-ation in oxy-combustion flue gas,especially the influence of high content H 2 O and CO2 on the chemical re-actions among the flue gas oxidative components (SO3 ,SO2 ,NO,NO2 ,HCl,O2 ,CO),as well as the interac-tion between the Hg0 reactants and components,were investigated,which was the key of controlling Hg e-mission with application of new oxy-combustion technology.From consulting references we find,during different combustion processes,the flue gas component will be different,both the reaction mechanism be-tween the Hg0 and flue gas components and the morphology change mechanism of Hg0 will deeply affect the emission control mode of Hg0 .The mercury emission rules and control mechanism based on the conven-tional coal combustion flue gas may not be suitable to those based on the oxy-combustion flue gas.%富氧燃烧是控制CO2排放最有效的技术之一。了解富氧燃烧气氛下汞析出形态规律,特别是在煤富氧燃烧气氛下,高 H2 O和CO2含量对烟气中主要氧化性组分(SO3,SO2,NO,NO2, HCl,O2,CO)间化学反应的作用,以及反应产物和组分与 Hg0间的相互影响规律,是解决随着富氧燃烧新技术的应用而出现汞控制问题的关键。对此,本文通过查阅相关文献总结分析发现：由于不同燃烧过程会造成烟气组分不同,H g0与不同烟气组分间的反应机理以及 H g0的形态转变机制均会对 H g0的控制方式造成根本影响。同时指出,对于富氧燃烧模式下的新烟气构成,在常规煤燃烧烟气组分基础上建立的汞排放规律、机制与机理等可能不再适用。