低温等离子体烟气脱硫的反应机制  

REACTION MECHANISM IN DESULFURIZTION OF FLUE GAS BY LOW TEMPERATURE PLASMA

作　　者：李瑞年[1] 阎克平[1] 蒲以康 缪劲松[1] 吴晓丽[1] 

机构地区：[1]北京理工大学应用物理系,北京100081

出　　处：《化工学报》1996年第4期481-487,共7页CIESC Journal

基　　金：国家自然科学基金

摘　　要：关于用脉冲电晕或电子束照射（产生低温等离子体）脱除烟气二氧化硫的主要反应机制，有过两种推测，即气相反应和异相反应.本文所列结果表明，在有适当的水蒸气压条件下，在反应器内部的表面会生成液膜，液相中自由基SO_3^-亚硫酸根离子氧化为硫酸根离子的链过程中起主要作用．解动力方程发现，液相吸收的羟基产生85％以上的脱硫率，超过了气相脱硫率的十多倍，说明主要机制是活化液相反应．计算结果与实验相符，预言的面积因子效应也得到实验证实．As for the main reaction mechanism in desulfurization of flue gas by pulsed corna or electron beam,which generates low temperature plasmas,there were two presumptions:gas phase reactions and heterogeneous reactions.The results of this work indicate that with an appropriate partial pressure of water vapor,there exists liquid layers on the inner surfaces of the reactor and the solid deposits.The radicals of SO3 play an important role in the chain processes of oxidizing sulfite ons to sulfate ions.By solving the kinetic equations,it can be found that the hydroxyls absorbed by the liquid phase contribute over 80％ percent of desulfurization rate,which is over ten times of that due to gas phase reactions.It suggests that the main mechanism is the plasma-activated liquid phase reactions.The calculated results not only agrde with the experiment but also predict the effect of effective area factor.The prediction is proved by the experiments.

关 键 词：低温等离子体 烟气 脱硫 酸雨 防治 

分 类 号：X701[环境科学与工程—环境工程] X517