空气分级燃烧对炉膛中SO_3生成的研究  

Research of SO_3 Generation in Furnace with Air Staged Combustion Technology

作　　者：韩高岩 吕洪坤[1] 李剑[1] 肖海平[2] 王磊[1] 

机构地区：[1]国网浙江省电力公司电力科学研究院 [2]华北电力大学能源动力与机械工程学院

出　　处：《电站系统工程》2017年第2期13-16,共4页Power System Engineering

基　　金：国家自然科学基金资助项目(51206047)资助

摘　　要：利用化学动力学模型计算研究空气分级燃烧改造前后炉膛中SO_3生成过程及浓度的变化。结果表明:空气分级燃烧改造后,在还原区中几乎无SO_3生成,在氧化区中SO_3快速生成,但SO_3的炉膛出口浓度小于改造前。在氧化性氛围中高温燃烧区SO_3主要通过SO_2+O(+M)=SO_3(+M)生成,随炉膛截面升高,烟气温度降低,主要生成途径变为HOSO_2+O_2=SO_3+HO_2。改造后NO_2浓度减少,基元反应SO_2+NO_2=SO_3+NO生成SO_3速率大幅度降低,这是改造后SO_3浓度减少的一个重要因素。The chemical kinetic model is used to research the SO_3 generated process and the change of SO_3 concentration before and after the modification. The results show that after modification, almost no SO_3 generated in the reduction zone, and SO_3 rapidly generated in the oxidation zone, but SO_3 is less than that before the modification at furnace outlet. SO_3 mainly generated by SO_2＋O（＋M）=SO_3（＋M） in the high temperature oxidation atmosphere, along with the furnace cross-section increased, the flue gas temperature decreased, the main production means of SO_3 became HOSO_2＋O_2= SO_3＋HO_2. After transforming, NO_2 concentration decreased, elementary reaction SO_2＋NO_2=NO＋SO_3 generated SO_3 rate greatly reduced, it is one of the important factors of SO_3 concentration reduced.

关 键 词：化学动力学计算 空气分级燃烧 基元反应 SO3浓度 

分 类 号：TK16[动力工程及工程热物理—热能工程]