臭氧氧化结合碱液吸收法烟气脱硝的工艺研究  

Absorption of NO_x from flue gas with alkaline aqueous solution combined with gas-phase oxidation of NO using ozone

作　　者：李君[1,2] 盛重义[3] 杨柳[3] 邓劲松[1,2] 

机构地区：[1]浙江大学环境与资源学院,浙江杭州310058 [2]俄克拉荷马大学土木工程与环境科学学院,美国俄克拉何马州诺曼73019 [3]南京师范大学环境科学与工程系,江苏南京210046

出　　处：《电力科技与环保》2014年第6期19-22,共4页Electric Power Technology and Environmental Protection

基　　金：江苏省自然科学基金(BK20130907);江苏省高校自然科学研究项目(13KJB610012);南京师范大学高级人才科研启动项目(201305XGQ0056);浙江省工业锅炉炉窑烟气污染控制工程技术研究中心开放基金

摘　　要：利用臭氧将烟气中溶解度较小的NO氧化成NO2,再结合尿素、氢氧化钠、氢氧化钙溶液吸收脱除臭氧氧化产物,重点考察了O3与NO反应的摩尔比、进口NO浓度、烟气中SO2浓度和相对湿度等工艺参数对NO氧化的影响,并探明不同的吸收液脱除臭氧氧化产物的特性。结果显示O3与NO反应的最佳摩尔比为1.02,随着进口NO浓度的增加氧化效率下降,而烟气中的SO2和相对湿度对NO氧化影响较小。通过对氢氧化钙吸收臭氧氧化产物的特性分析得出,碱液对NO的吸收率相对较小,而对NO2的吸收率达到80%以上。NO was oxidized into NO2 first by injecting ozone into flue gas stream,and then NO2 was absorbed from flue gas by urea,sodium hydroxide and calcium hydroxide solution.The mole ratio of O3 to NO,inlet NO and SO2 concentration in flue gas,and relative humidity were investigated in the influence of NO oxidation.The experimental results indicated that the optimal molar ratio of O3 to NO is 1.02.NO conversion decreased with the increase of NO concentration.The SO2 concentration and the relative humidity in flue gas have few effects on the NO oxidation.The absorption products of NOxoxidized by ozone injection with Na OH aqueous solution were analyzed.And the characterization results showed that NO was little absorbed by alkaline aqueous solution,while the NO2 absorption efficiency was more than 80%.

关 键 词：烟气脱硝 臭氧 氧化 吸收 碱液 

分 类 号：X701.7[环境科学与工程—环境工程]