摘要
在铁法脱硫的基础上,利用Fe(Ⅲ)离子可以催化氧化NO_x与SO_2溶于液相中形成的S(IV)化合物发生反应的特性,在鼓泡反应器中进行了铁离子液相催化氧化协同脱除烟气中SO_2和NO_x的实验研究,考察了吸收液pH值、温度、烟气中SO_2和NO_x的浓度比等因素对SO_2和NO_x脱除效率的影响。结果表明:实验条件下影响因素的改变并未对SO_2脱除效率产生影响,其脱除效率一直维持在95%以上;对NO_x的脱除效率影响较大,吸收液pH值在3.0左右时,NO_x脱除效率最高,其脱除率可达62%;温度和烟气中SO_2和NO_x的浓度比的增大都会在一定程度上提高NO_x的脱除效率。仅当吸收液温度增大到50℃以后,溶液中Fe(Ⅲ)离子水解生成絮凝状沉淀时,NO_x的脱除效率开始下降;另外,SO_2和NO_x的浓度比大于2.3∶1时,即可满足NO_x脱除的需要。
On the basis of iron（ Ⅲ） ions catalyzed oxidation of sulfur（ IV） compounds,a experiment of synergetic removing SO_2 and NO_x by iron-aqueous catalytic oxidation was carried out in a bubble column. Some factors of effects,including pH value of absorbing solution,temperature and the ratio of SO_2/ NO_x concentration in flue gas on removal efficiency of NO_x ,were investigated. Results show that factors change did not affect the SO_2 removal efficiency,its removal efficiency maintained at more than 95%,but had an considerable influence on NO_x removal efficiency. On the one hand,the best NO_x removal rate was 62% at the pH value around 3. 0. On the other hand,the removal rate of NO_x was positive correlation with the temperature and the ratio of SO_2/ NO_x concentration in a certain extent. Only when the absorption liquid temperature increased to 50 ℃,the solution of iron（ Ⅲ） generated flocculation precipitation,NO_x removal efficiency began to decline. Besides,the ratio of SO_2 and NO_x concentration was greater than 2. 3 that can meet the need of NO_x removal.
出处
《环境工程学报》
CAS
CSCD
北大核心
2016年第6期3135-3140,共6页
Chinese Journal of Environmental Engineering
基金
北京市环境保护科学研究院科技基金项目(2013-B-03)
北京市科技计划项目资助(D14110900110000)
关键词
铁离子
脱硫脱硝
协同控制
湿法
iron
simultaneous desulfurization and denitrification
synergetic control
wet method
