烟气脱氮体系中络合吸收剂的氧化还原过程  

The oxidation reduction process of complex absorbent in the system of nitrogen removal from flue gas

作　　者：荆国华[1] 李伟[2] 施耀[2] 

机构地区：[1]华侨大学环境工程系,福建泉州362021 [2]浙江大学环境工程研究所,浙江杭州310027

出　　处：《中国环境科学》2007年第1期132-136,共5页China Environmental Science

基　　金：福建省自然科学基金项目(2006J0136);国务院侨办科研基金(06QZR09);福建省青年科技人才创新基金项目(2005J027);浙江省科技攻关计划重点项目(2006C23064)

摘　　要：在填料吸收塔中,考察NO和O2共存时,NO浓度、O2含量对脱氮效率、FeII(EDTA)氧化速率以及FeIII(EDTA)生物还原速率的影响,并对该系统的主要反应过程进行了分析.结果表明,同时吸收NO可促进FeII(EDTA)的氧化,当进气NO浓度由0增至500cm3/m3时,表观氧化反应速率常数由0.00451min-1增至0.00604min-1;FeII(EDTA)的氧化反应对于O2含量为1级反应,表观氧化速率常数与O2含量成线性关系;增加气体中NO浓度或O2含量均会使FeIII(EDTA)的生物还原反应速率下降;微生物对氧化中间产物的还原可以减缓NO对FeII(EDTA)氧化的促进作用,因而气相中NO和O2共存时对FeIII(EDTA)生物还原的影响小于各单一组分存在时的影响之和.The influence of NO concentration and O2 content on NO removal efficiency, Fe^Ⅱ（EDTA） oxidation rate and Fe^Ⅲ（EDTA） bioreduction rate were investigated at the coexistence of NO and O2 in a stuffing absorption tower, and the main reaction process of this system was analyzed. Simultaneous NO absorption could promote the oxidation of Fe^Ⅱ（EDTA）, the apparent oxidation reaction rate constant increased from 0.00451min^-1 to 0.00604min^-1, when NO concentration of input gas increased from 0 to 500cm^3/m^3. The oxidation reaction of Fe^Ⅱ（EDTA） by O2 was fhst order reaction, apparent oxidation rate constant had liner relation with O2 content. Increase of NO concentration or O2 content in gas could all lower the bioreduction reaction rate of Fe^Ⅲ（EDTA）. The intermediates of NO2 and NO3 in NO absorption could be reduced by microorganisms, which decreased the stimulated oxidation of Fe^Ⅱ（EDTA） caused by the intermediates, thus the influence of coexistence of O2 and NO in gas phase on Fe^Ⅲ（EDTA） bioreduction was smaller than the influence sum of each single component.

关 键 词：络合吸收 微生物 烟气脱氮 氧化还原过程 

分 类 号：X703[环境科学与工程—环境工程]