有机酸脱硫浆液的离子浸出与传质特性  

Ion Leaching Behavior and Mass Transfer Characteristics of Organic Acids Slurry

作　　者：张东平[1] 李乾军[1] 张方[1] 刘献锋[1] 周长城[2] 

机构地区：[1]南京工程学院环境工程系,江苏省南京市211167 [2]东南大学能源与环境学院,江苏省南京市211189

出　　处：《中国电机工程学报》2012年第26期43-49,145,共7页Proceedings of the CSEE

基　　金：国家高技术研究发展计划项目(863计划)(2007AA061802);江苏省"青蓝工程"资助~~

摘　　要：基于湿法烟气脱硫中试装置，进行4种有机酸强化浆液脱硫实验研究，测定了有机酸对离子浸出、石灰石利用、SO2吸收、传质阻力与增强因子的影响。结果显示：除草酸外，已二酸、柠檬酸、甲酸对Ca^2＋，Mn^2＋，Fe^3＋浸出有明显促进。与空白相比，pH=5.6，Ca2＋浸出分别增加50.7%、41.4%、32.9%，Fe^3＋、Mn^2＋浸出量约增加1倍，Mn2＋等与HSO3形成络合物诱发催化反应加速SO32 氧化，同时反应面H＋浓度提高，CaSO3溶解速率加快。浆液pH值、有机酸种类与气相总传质阻力密切相关，pH〉6.0，为平稳上升阶段，pH〈6.0，为快速上升阶段，pH=5.0，已二酸、柠檬酸、甲酸的阻力仅为空白的45%，46%，61%。SO2吸收速率增加1.3%-5.6%，且pH值越低，作用越明显。结果表明：对浆液的离子浸出与传质特性促进排序为已二酸〉柠檬酸〉甲酸〉空白〉草酸。In the pilot plant of wet flue gas desulphurization, experiments of four kinds of organic acids promoting slurry desulphurization were carried out. Effects of organic acids on ions＇ leach, limestone utilization, SO2 absorption rate, mass transfer resistance and enhancement factor were studied. Results show that besides oxalic acid, adding hexanedioic acid, citric acid and formic acid into slurry can obviously promote the leaching of Ca^2＋, Mn^2＋ and Fe^3＋. PH=5.6, leaching content of Ca^2＋ increases by 50.7%, 41.4% and 32.9% respectively, the leaching contents of Mn^2＋, Fe^3＋ also significantly increase by 100%. Mn^2＋ forms complex compound with HSO3 that can accelerate the catalytic reaction of SO3^2- oxidization. At the same time, H＋ concentration of reaction surface also increases and the solution rate of CaSO3 is accelerated. PH value of slurry and kind of organic acids are closely according to the gas phase general mass-transfer resistance. When ph〉6.0, it is the steadily increasing stage. When ph〈6.0, it is sharply increasing stage. When pH=5.0, the resistance of hexanedioic acid, citric acid and formic acid is respectively 45%, 46% and 61% of the blank condition. SO2 absorption rate increases by 1.3%-5.6% and the effect are evidently especially when pH value is low. All in all, the order of promoting slurry ions＇ leach and mass-transfer from high to low is respectively hexanedioic acid, citric acid and formic acid, blank and oxalic acid.

关 键 词：脱硫 催化氧化 离子浸出 有机酸 传质特性 

分 类 号：X511[环境科学与工程—环境工程]