论文部分内容阅读
运用详细汞化学反应动力学机制和涡耗散概念(eddydissipation conception,EDC)模型对410 t/h四角切圆燃煤锅炉炉内汞释放及下游烟道内汞赋存方式变化进行了模拟,得出煤粉燃烧时炉内汞的析出释放和分布规律,以及下游烟道内汞赋存形态的转变迁移特性。结果表明:在燃煤烟气中,HCl是单质汞氧化的关键组分;温度高于1 000 K时,单质汞是汞的主要赋存形式,HOCl是氧化单质汞的重要组分;温度低于900 K时,氧化态汞是主要的存在状态,氯化物形态的汞化合物含量约为92.36%、HgO含量7.64%,Cl2是产生HgCl2的重要组分;汞的氧化反应主要发生在尾部下行烟道中,HgCl2浓度随温度下降均呈迅速上升趋势。
Detailed mercury chemical reaction kinetics mechanism and EDC model were used to simulate the release of mercury in the 410 t / h tangentially fired boiler and the changes of mercury occurrence patterns in the downstream flue gas. Precipitation, release and distribution of mercury in the furnace combustion, and the transformation and migration of mercury speciation in the downstream flue. The results show that HCl is the key component of elemental mercury oxidation in coal-fired flue gas. When the temperature is higher than 1000 K, elemental mercury is the main form of mercury and HOCl is an important component of oxidized elemental mercury. Low temperature At 900 K, the oxidation state of mercury is the predominant state. The content of mercury compounds in chloride forms is about 92.36%, the content of HgO is 7.64% and Cl2 is an important component to produce HgCl2. The oxidation reaction of mercury mainly occurs in the tail smoke Road, HgCl2 concentration showed a rapid upward trend with temperature.