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.
出处
《化工学报》
EI
CAS
CSCD
北大核心
1996年第4期481-487,共7页
CIESC Journal
基金
国家自然科学基金
关键词
低温等离子体
烟气
脱硫
酸雨
防治
low temperature plasmas,activated liquid phase eactions,chain process,SO_3 free radical,chemical environment of chainreactions,effective area factor
