烟气脱硫亚硫酸钙铁催化氧化动力学实验  

Kinetics analysis of oxidation process of calcium sulfite in flue gas desulfurization technology

作　　者：杨剑[1] 刘清才[1] 郑慧敏[1] 董凌燕[1] 夏克菲[2] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400030 [2]重庆市环境科学研究院,重庆401147

出　　处：《重庆大学学报（自然科学版）》2009年第8期910-914,共5页Journal of Chongqing University

基　　金：国家科技支撑计划(2007BAC24B00)

摘　　要：烟气脱硫中亚硫酸钙的氧化程度直接影响到烟气中的最终脱硫量,但其速率表达式的研究结果存在一定差异。采用内径为1.2 m,高为1.2 m的反应器氧化实验装置进行了亚硫酸钙的铁催化氧化实验,实验所得亚硫酸氢根离子的反应级数约为1,铁离子反应级数约为0.5,溶解氧的反应级数约为0,氧化反应的活化能为54.52 kJ.mol-1。结合菲克定律及双膜理论建立了烟气脱硫亚硫酸钙的氧化过程动力学模型。利用模型计算得到亚硫酸氢根离子反应级数约为1,铁离子反应级数约为0.5,溶解氧反应级数约为0,氧化反应的活化能为53.85 kJ.mol-1。实验结果表明,模型精度高,相对误差为1.22%。The oxidation of calcium sulfite directly affect the final rate of flue gas desulfurization, but the study on the expression of oxidation rate is still in a dispute. Ferrous-catalytic oxidation kinetics of calcium sulfite has been studied with experiments in the oxidation stimulant which is 1.2 m diameter and 1.2 m height. The reaction order of bisulfite ion, ferrous ion and dissolved oxygen were 1, 0. 5 and 0 respectively, and the activation energy was 54.52 kJ·mol-1. A kinetic model for the oxidation process of flue gas desulfurization technology has also been set up based on the Fick law and double film theory. Reaction order of bisulfite ion, ferrous ion and dissolved oxygen were 1, 0. 5 and 0, and the activation energy was 53.85 kJ ·mol-1. With the results of experiment and model, the precision of the model is high with relative error of 1.22%.

关 键 词：烟气脱硫 催化氧化 动力学 

分 类 号：X701.3[环境科学与工程—环境工程]