烟气中一氧化氮的液相吸收与综合利用  

Liquid absorption and comprehensive utilization of NO in flue gas

作　　者：夏涵泊 李保山[1] 

机构地区：[1]北京化工大学理学院,北京100029

出　　处：《无机盐工业》2016年第1期54-57,共4页Inorganic Chemicals Industry

摘　　要：采用两步法来脱除烟气中的一氧化氮,首先以FeⅡEDTA溶液来配位固定烟气中的一氧化氮,然后用双氧水把配位固定的一氧化氮氧化为硝酸根。为了使吸收液再生,调节溶液的p H为4.0,加入铁粉还原溶液中生成的FeⅢ,使其转化为FeⅡEDTA,可继续吸收烟气中一氧化氮。实验时考察了FeⅡEDTA吸收液的p H、浓度、温度和双氧水用量等对FeⅡEDTA吸收一氧化氮和进一步氧化为硝酸根的效率的影响。研究表明:用浓度为0.13 mol/L的FeⅡEDTA吸收液吸收一氧化氮达到饱和后,取适量吸收溶液,向其中加入双氧水氧化,氧化后可生成硝酸根浓度为0.109 mol/L的溶液,一氧化氮的吸收氧化效率可达83.8%。吸收液循环使用5次后,用调节p H等方式可把溶液中的EDTA、铁盐和硝酸盐等回收以达到综合利用的目的。吸收液经过5次循环吸收后,EDTA的回收率为93.1%。Two-step method was employed to removal the NO in flue gas.Firstly, NO was fixed by complex absorpion with the solution of Fe nEDTA, and then NO can be oxidized to NO3- by H2O2.In order to regenerate the absorption liquid, the pH of the solution was adjusted to 4.0, and then add Fe powder to deoxygenate Fe ^Ⅲ to Fe^Ⅱ, so that it can keep on absorbing NO.In the experiments, some factors, such as the pH of the Fe^ⅡEDTA solution, concentration, temperature, and the amount of H2O2, which may affect Fe HEDTA absorbing NO and further oxidating NO to NO3- were studied.Results showed that the oxidation efficiency of NO can reach 83.8%, when Fe ^Ⅱ EDTA （0.13 mol/L） was used to absorb NO and add H2Oz as the oxidizer later, the concentration of NO3-was 0.109 mol/L finally.After five recyclings of the absorption liquid ,EDTA ,molysite ,and nitrate etc., can be recovered by adjusting the pH to achieve comprehensive utilization, and the recovery rate of EDTA was 93.1%.

关 键 词：NO Fe^ⅡEDTA H2O2 综合利用 烟气脱硝 

分 类 号：TQ126.24[化学工程—无机化工]