低浓度SO_2在部分润湿活性炭上的催化氧化

LOW CONCENTRATION SO_2 OXIDATION OVER PARTIALLY WETTED ACTIVATED CARBON

对低浓度SO2 在活性炭上催化氧化耦合部分液相蒸发情况进行了理论分析和实验研究 .建立了此情况下填充床反应器的动态数学模型 ,并对模型进行了实验验证 .该模型揭示了放热反应、吸热蒸发和活性炭颗粒内部部分润湿之间的相互作用 .同时对两种不同的操作方式和催化剂的初始润湿状态进行了比较 ,表明本文提出的方法能够提高SO2 脱除率和副产酸的浓度 .

A residue carbon is used as a catalyst for the catalytic oxidation of SO 2 in a packed-bed reactor.The influences of reaction temperature,space velocity, and inlet SO 2 concentration on the elimination efficiency for SO 2 is also investigated.A new technique for SO 2 removal is developed in the study,that is SO 2 removal by a partially wetted bed with deactivated carbon regenerated first by multistage bubbling and subsequently by drying.Theoretical analysis and experimental results of low concentration SO 2 oxidation over activated carbon coupled with partial liquid phase vaporization are presented.A dynamic model has been first developed for this combination of reaction with vaporization of liquid in the packed bed.The model reveals the interactions among the exothermic reaction,endothermic vaporization and partial internal wetting of activated carbon pellets.Reliability of the model is confirmed by experiments.Secondly,the effects of the two different operation modes and the states of the wetted catalysts on SO 2 oxidation are compared.The results demonstrate that the method has increased SO 2 removal efficiency and sulfuric acid concentration.SO 2 removal can be almost 100%,the concentration of by-product sulfuric acid can be greatly enhanced to as high as 34%(wt).