NaCl电解氧化吸收液脱除烟气中的NO_(x)  

NO_(x) removal from flue gas by NaCl electrolytic oxidation absorption solution

作　　者：苏晓锋 夏张 高康宁 朱宏艺 郭蔓 李登新[2,3] 许士洪[2,3] SU Xiaofeng;XIA Zhang;GAO Kangning;ZHU Hongyi;GUO Man;LI Dengxin;XU Shihong(Shanghai Materials Engineering School,Shanghai 200231,China;School of Environmental Science and Engineering,Donghua University,Shanghai 201620,China;National Environmental Protection Textile Pollution Prevention Engineering Technology Center of Donghua University,Shanghai 201620,China)

机构地区：[1]上海市材料工程学校,上海200231 [2]东华大学环境科学与工程学院,上海201620 [3]东华大学国家环境保护纺织污染防治工程技术中心,上海201620

出　　处：《环境工程学报》2023年第1期165-172,共8页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金钢铁联合研究基金资助项目(U1660107);上海市生态环境局资助项目(沪环科[2019]第10号);中央高校基本科研业务费专项资金(2232020A-10)。

摘　　要：研究了NaCl质量浓度、电解时间对电解生成有效氯组分的影响,并以NaCl电解液作为氧化吸收液在自制的小型鼓泡喷淋吸收塔中进行模拟烟气脱硝实验,进一步研究了有效氯质量浓度、反应体系pH和温度对脱硝效果的影响,同时分析了脱硝机理。结果表明:有效氯质量浓度随着NaCl质量浓度和电解时间的增加逐渐增加,电解反应的主产物是ClO^(-)。NOx去除率随着有效氯质量浓度增加而升高;氧化体系酸度和温度增高有利于NO氧化,但不利于NOx吸收去除。当烟气流量为2 L·min^(-1),NO初始质量浓度为1340 mg·m^(-3),吸收液有效氯初始质量浓度为2.5 g·L^(-1),反应体系pH为5,温度为30℃时,NO的转化率可达91.1%,NOx去除率可达78.9%,且能在该条件下长时间保持较高的烟气脱硝效果。本研究结果可为低温湿法氧化脱硝技术的工业化应用提供参考。An experiment simulating flue gas denitrification was conducted in a small bubble spray absorption tower using NaCl electrolyte as the oxidation and absorption solution.The effect of NaCl mass concentration and electrolysis time on the effective chlorine fraction generated by electrolysis was also investigated.The effects of effective chlorine mass concentration,pH and temperature of the reaction system on the denitrification effect were further studied,the denitrification mechanism was also analyzed.The results showed that the effective chlorine mass concentration increased gradually with the increase of NaCl mass concentration and electrolysis time,and the main product of the electrolysis reaction was ClO-.The removal rate of NOxincreased with the increase of available chlorine mass concentration.The increase of acidity and temperature of the oxidation system was beneficial to NO oxidation,but not to NOxabsorption and removal.At a flue gas flow rate of 2 L·min^(-1),an initial NO mass concentration of 1340 mg·m^(-3),an initial absorption solution effective chlorine mass concentration of 2.5 g·L^(-1),a reaction system pH of 5 and a temperature of 30℃,the conversion rate of NO could reach 91.1%and the removal rate of NOxcould reach 78.9%,and the high flue gas denitrification effect could be maintained for a long time under these conditions.

关 键 词：电解氧化 有效氯 烟气脱硝 氮氧化物 

分 类 号：X701[环境科学与工程—环境工程]