氧气对硫化钠溶液吸收二氧化硫的影响  

Effects of O_2 on absorption of SO_2 by Na_2S solution

作　　者：秦毅红[1] 刘锋[1] 张丽[1] 

机构地区：[1]中南大学冶金与环境学院,湖南长沙410083

出　　处：《硫酸工业》2015年第5期46-50,共5页Sulphuric Acid Industry

摘　　要：采用自制SO2吸收装置，研究吸收液pH值为13-7时，O2对Na2S吸收SO2后溶液各含硫离子的影响。结果表明，Na2S溶液吸收SO2的过程中，溶液pH值的变化呈现三阶段两突降模式，溶液在pH值为12-7时逸出H2S。烟气中O2的存在对溶液中S2-含量影响不大，但会加快SO32-的氧化消耗。O2会促进S2O32-的生成，但高浓度的O2会抑制S2O32-的生成。O2的存在会引入新的含硫离子SO42-，其主要来源于吸收液中SO32-的氧化，O2浓度越高，生成的SO42-越多；当O2浓度从10％上升到30％时，SO42-的氧化生成率从2．97％增大到11．2％。When the absorption solution pH value is 13-7, effects of O2 on absorption of SO2 by Na2S solution are described by SO2 absorption unit being of there own manufacture. The results showed that the process of N% S solution absorbing SO2 , the pH value presenting three-stage two-dip mode, escaping H2S at pH value 12-7. The presence of O2 in the flue gas has little effect on S2- in thesolution, but will accelerate oxidation consumption of SO32-. O2 will promote S2O32- generated, but high concentrations of O2 inhibits the generation of S2O32-. Presence of O2 will introduce new sulphur-containing ions SO42-, which comes mainly from the absorption liquid oxidizing SO32-, The higher the concentration of O2 the more SO42- generated. When O2 concentration rised from 10% to 30%, oxidation rate of SO42- increased from 2. 97% to 11.2%.

关 键 词：氧气 硫化钠溶液 二氧化硫 烟气 吸收 

分 类 号：X701.3[环境科学与工程—环境工程]