搅拌槽内桨型对微观混合的影响

在直径为0.476m的搅拌槽内,采用平行竞争反应体系,就不同的桨叶型式、加料时间、搅拌转速、加料位置对产物分布的影响进行了系统的实验研究,并采用涡旋卷吸模型对实验结果进行了模拟计算。本工作的研究结果对于工业用搅拌反应器的设计及放大具有一定的参考意义。

The effect of impeller types on micromixing in a stirred tank

The product distribution of fast complex reactions in an agitated reactor is significantly affected by micromixing. A pair of competitive parallel test reactions developed by Yu were used to investigate the micromixing in a stirred tank of 0.476m diameter with a single impeller. Narrow blade hydrofoil CBY impeller and hollow blade disk turbine HD-6 were used in the experiments. The effects of the feed time, impeller speed, feed location and the impeller types on the product distributions were systematically studied. A simplified micromixing model, the engulfment model (E-model), was used to predict the product distributions with HD-6 impeller.A good agreement was found between the results predicted by the E-model and the experimental data. The results are of importance to the design and scale-up of the industry stirred reactors with fast complex reactions.