基于石灰石法脱硫浆液的K_2S_2O_8氧化Hg^0性能  

Characteristics of Hg^0 oxidation by K_2S_2O_8 based on limestone-gypsum desulfurization slurry

作　　者：田立江[1] 刘秉坤 李杰[1] 沈晓玲 TIAN Lijiang;LIU Bingkun;LI Jie;SHEN Xiaoling(School of Environment Science & Spatial Informatics,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]中国矿业大学环境与测绘学院,江苏徐州221116

出　　处：《中南大学学报（自然科学版）》2019年第1期23-28,共6页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51208502)~~

摘　　要：利用改进的Hg^0液相氧化反应器,考察脱硫浆液pH、K2S2O8浓度、金属离子浓度、入口烟气Hg^0和SO2质量浓度对氧化Hg^0性能的影响。研究结果表明:低pH有利于K2S2O8高效氧化Hg^0,p H在5.0左右时,Hg^0氧化效率能维持在83%以上。K2S2O8浓度在5 mmol/L时,Hg^0氧化效率高于90%并呈现很好的运行稳定性。Mn2+,Ag+或Co2+的存在均可提高Hg^0氧化性能,但提高K2S2O8浓度至5 mmol/L也能达同等效果。Hg^0氧化效率随浆液Fe3+浓度的增加先增加后趋于稳定,当Fe3+浓度增至2.0mmol/L以上时,Hg^0氧化效率再次增加;Mg2+的存在反而使Hg^0性能有所降低。Hg^0氧化效率随烟气SO2质量浓度的升高先增加后逐渐下降,最高可达85.57%,且SO2的存在增强了系统Hg^0氧化的稳定性。The effects of slurry pH,K2S2O8 concentration,metallic ion concentration,inlet flue gas Hg^0 and SO2 mass concentration on Hg^0 oxidation were studied based on the modified liquid reactor.The results show that low value of slurry pH is propitious to oxidize Hg^0,and the oxidation efficiency can maintain above 83%when the value of pH keeps around 5.0.The oxidation efficiency of Hg^0 can be higher than 90%and keeps stable steadily when K2S2O8 concentration reaches 5 mmol/L.The existence of Mn^2+,Ag^+or Co^2+can improve the Hg^0 oxidation capability while it can acquire the same outcome through increasing the K2S2O8 concentration to 5 mmol/L.With the increase of Fe^3+concentration,the Hg^0 oxidation efficiency rises firstly,then becomes steady,but the efficiency rises again when the Fe3+concentration is higher than 2.0 mmol/L.The existence of Mg2+does not enhance the Hg^0 oxidation but weakens the oxidation capability.Hg^0 oxidation efficiency rises firstly and then descends gradually,and the highest efficiency can reach 85.57%with the increase of flue gas SO2 mass concentration.The existence of SO2 can enhance the stabilization of the system about Hg^0 oxidation.

关 键 词：石灰石-石膏法 脱硫浆液 燃煤烟气 汞氧化 

分 类 号：X511[环境科学与工程—环境工程]