微通道反应器微观混合效率的实验研究

An experimental study of the micromixing efficiency in microchannel reactors

采用碘化物-碘酸盐体系作为平行竞争反应体系,利用化学探针法对Y型和T型微通道反应器的微观混合性能进行了研究。实验探讨了反应物浓度、体积流量、体积流量比等条件对微通道反应器微观混合效率的影响。结果表明,不同结构的微通道反应器有不同的H+浓度范围,Y型微通道为0.02～0.06mol/L;T型微通道为0.06～0.08mol/L。此外,反应物浓度的减小(尤其是关键组分H+浓度的减小),体积流量的增大及体积流量比的减小均有利于微观混合效率的改善;小流量下,T型微通道的微观混合效率明显优于Y型,但当体积流量增大到一定值时,两种微通道反应器的微观混合性能基本相当。

Abstract： The micromixing efficiencies in Y-type and T-type microchannel reactors were studied by using the iodide-iodate parallel competing reaction system. The effects of varying reactant concentration, volume flow rate and volume flow ratio on the micromixing efficiency were investigated in detail. The experimental results indicate that the most sensitive hydrogen ion concentration range for measurements is different： 0.02- 0.06 mol/L for the Y-type microchannel and 0.06- 0.08 mol/L for the T-type microchannel. Furthermore, the micromixing efficiency increases with the reduction in reactant concentration （especially the crucial H^＋ concentration）, and also increases with the increase in volume flow rate and the decrease in volume flow ratio. At a low volume flow rate, the T-type microchannel has a much better micromixing performance than the Y-type. However at a high volume flow rates, the two microchannel reactors have similar excellent micromixing efficiencies.