基于亚铁螯合物络合吸收的NO和NO_2协同净化实验研究
|
摘要
基于乙二胺四乙酸亚铁螯合剂络合吸收的NO和NO_2协同净化工艺,一级净化采用铁屑填料床,利用螯合物吸收、铁屑还原净化NO,二级吸收采用鲍尔环清水喷淋塔,考察协同净化效果。结果表明:当NO进口质量浓度约为200mg/m~3、NO_2进口质量浓度约为70mg/m~3、螯合剂为0.02mol/L、液气比为3L/m~3、空塔气速为0.078m/s的条件下,一级出口NO降至75mg/m~3左右;在一级吸收塔螯合剂为0.02mol/L、液气比为3L/m~3和二级吸收塔氧化度(NO_2占NO_x的体积分数)为50%、液气比为4L/m~3的条件下,二级出口NO、NO_2分别可稳定在20、8mg/m~3左右。
The synergistic purification of NO and NO_2 was realized based on complexation and absorption of ethylene diamine tetra acetic acid chelating agent.The first stage purification was carried out by iron packing bed,using chelate absorption and iron reduction,to decrease the concentration of NO.The second stage absorption was implemented in Bauer ring water spray tower,and the effect of synergistic purification was investigated.The results showed that when the mass concentration of NO was about 200 mg/m~3,NO_2with 70 mg/m~3,the concentration of chelating agent at 0.02mol/L,the liquid gas ratio at 3L/m~3,and the air velocity of air tower with 0.078m/s,the first order export NO was reduced to about 75mg/m~3.NO and NO_2of the second stage outlet was stabilized at 20and 8mg/m~3 respectively,under conditions of the chelating agent of the first order absorption tower at 0.02 mol/L,the liquid gas ratio at 3L/m~3 and the second absorption tower oxygen degree of 50%,the liquid gas ratio at 4L/m~3.
The synergistic purification of NO and NO_2 was realized based on complexation and absorption of ethylene diamine tetra acetic acid chelating agent.The first stage purification was carried out by iron packing bed,using chelate absorption and iron reduction,to decrease the concentration of NO.The second stage absorption was implemented in Bauer ring water spray tower,and the effect of synergistic purification was investigated.The results showed that when the mass concentration of NO was about 200 mg/m~3,NO_2with 70 mg/m~3,the concentration of chelating agent at 0.02mol/L,the liquid gas ratio at 3L/m~3,and the air velocity of air tower with 0.078m/s,the first order export NO was reduced to about 75mg/m~3.NO and NO_2of the second stage outlet was stabilized at 20and 8mg/m~3 respectively,under conditions of the chelating agent of the first order absorption tower at 0.02 mol/L,the liquid gas ratio at 3L/m~3 and the second absorption tower oxygen degree of 50%,the liquid gas ratio at 4L/m~3.
引文
[1]陈健鹏,李佐军.中国大气污染治理形势与存在问题及若干政策建议[J].发展研究,2013,10(1):4-14.
[2]ZHANG L,WANG J,SUN Q,et al.Removal of nitric oxide in rotating packed bed by ferrous chelate solution[J].Chemical Engineering Journal,2012,181(1):624-629.
[3]GAMBARDELLA F,ALBERTS M S,WINKELMAN J G M,et al.Experimental and modeling studies on the absorption of NO in aqueous ferrous EDTA solutions[J].Industrial and Engineering Chemistry Research,2005,44(12):4234-4242.
[4]马乐凡.液相络合-铁还原-酸吸收回收法脱除烟气中NOx的研究[D].湘潭:湘潭大学,2005.
[5]LI W,WU C,ZHANG S,et al.Evaluation of microbial reduction of Fe(Ⅲ)EDTA in a chemical absorption-biological reduction integrated NOxremoval system[J].Environmental Science and Technology,2007,41(2):639-644.
[6]ZHU H,MAO Y,YANG X,et al.Simultaneous absorption of NO and SO2into FeⅡ-EDTA solution coupled with the FeⅡ-EDTA regeneration catalyzed by activated carbon[J].Separation and Purification Technology,2010,74(1):1-6.
[7]马乐凡,童志权.液相络合-铁粉还原-酸吸收回收法脱除烟气中NO[J].环境科学研究,2006,18(5):63-66.
[8]ZHOU Y,GAO L,XIA Y,et al.Enhanced reduction of Fe(Ⅱ)EDTANO/Fe(Ⅲ)EDTA in NOxscrubber solution using a three-dimensional biofilm-electrode reactor[J].Environmental Science and Technology,2012,46(22):12640-12647.
[9]WU Z,WANG L,ZHAO W.Kinetic study on regeneration of FeⅡEDTA in the wet process of NO removal[J].Chemical Engineering Journal,2008,140(1):130-135.
[10]陶雯,张俊丰,肖瑾瑜,等.Fe(Ⅱ)EDTA络合吸收-铁粉还原再生脱除NO性能[J].环境工程学报,2014,12(1):5393-5398.
[11]陶雯.间歇法FeⅡEDTA络合吸收-铁粉还原再生脱除NO过程及性能研究[D].湘潭:湘潭大学,2014.
[12]马乐凡,童志权,尹奇德,等.液相络合-铁屑还原-酸吸收回收法脱除烟气中的NOx[J].环境化学,2007,25(6):761-764.
[13]马乐凡,童志权,张俊丰.液相络合-铁粉还原酸吸收回收法脱除烟气中NOx的机理研究[J].环境科学学报,2005,25(5):637-642.
[14]张荣芳,张俊丰,易亮,等.基于氧化度调控的尿素还原脱除高浓度NOx[J].石油化工,2014,43(7):827-831.
[15]乔军师.NOx空气氧化与液相吸收实验研究[D].天津:天津大学,2005.
[16]肖瑾瑜.空气氧化-铁粉还原再生FeⅡEDTA络合吸收NO产物实验研究[D].湘潭:湘潭大学,2014.
[17]王娇.配二氧化氮调节氮氧化物氧化度湿法吸收氮氧化物实验研究[D].湘潭:湘潭大学,2012.
[2]ZHANG L,WANG J,SUN Q,et al.Removal of nitric oxide in rotating packed bed by ferrous chelate solution[J].Chemical Engineering Journal,2012,181(1):624-629.
[3]GAMBARDELLA F,ALBERTS M S,WINKELMAN J G M,et al.Experimental and modeling studies on the absorption of NO in aqueous ferrous EDTA solutions[J].Industrial and Engineering Chemistry Research,2005,44(12):4234-4242.
[4]马乐凡.液相络合-铁还原-酸吸收回收法脱除烟气中NOx的研究[D].湘潭:湘潭大学,2005.
[5]LI W,WU C,ZHANG S,et al.Evaluation of microbial reduction of Fe(Ⅲ)EDTA in a chemical absorption-biological reduction integrated NOxremoval system[J].Environmental Science and Technology,2007,41(2):639-644.
[6]ZHU H,MAO Y,YANG X,et al.Simultaneous absorption of NO and SO2into FeⅡ-EDTA solution coupled with the FeⅡ-EDTA regeneration catalyzed by activated carbon[J].Separation and Purification Technology,2010,74(1):1-6.
[7]马乐凡,童志权.液相络合-铁粉还原-酸吸收回收法脱除烟气中NO[J].环境科学研究,2006,18(5):63-66.
[8]ZHOU Y,GAO L,XIA Y,et al.Enhanced reduction of Fe(Ⅱ)EDTANO/Fe(Ⅲ)EDTA in NOxscrubber solution using a three-dimensional biofilm-electrode reactor[J].Environmental Science and Technology,2012,46(22):12640-12647.
[9]WU Z,WANG L,ZHAO W.Kinetic study on regeneration of FeⅡEDTA in the wet process of NO removal[J].Chemical Engineering Journal,2008,140(1):130-135.
[10]陶雯,张俊丰,肖瑾瑜,等.Fe(Ⅱ)EDTA络合吸收-铁粉还原再生脱除NO性能[J].环境工程学报,2014,12(1):5393-5398.
[11]陶雯.间歇法FeⅡEDTA络合吸收-铁粉还原再生脱除NO过程及性能研究[D].湘潭:湘潭大学,2014.
[12]马乐凡,童志权,尹奇德,等.液相络合-铁屑还原-酸吸收回收法脱除烟气中的NOx[J].环境化学,2007,25(6):761-764.
[13]马乐凡,童志权,张俊丰.液相络合-铁粉还原酸吸收回收法脱除烟气中NOx的机理研究[J].环境科学学报,2005,25(5):637-642.
[14]张荣芳,张俊丰,易亮,等.基于氧化度调控的尿素还原脱除高浓度NOx[J].石油化工,2014,43(7):827-831.
[15]乔军师.NOx空气氧化与液相吸收实验研究[D].天津:天津大学,2005.
[16]肖瑾瑜.空气氧化-铁粉还原再生FeⅡEDTA络合吸收NO产物实验研究[D].湘潭:湘潭大学,2014.
[17]王娇.配二氧化氮调节氮氧化物氧化度湿法吸收氮氧化物实验研究[D].湘潭:湘潭大学,2012.