摘要：为了改善分级器性能,试验引入径向气流对旋风分级器中的颗粒进行再次分离;试验物料选用催化裂化(FCC)和S-Zorb催化剂,对分级机进行了5组不同径向气速的试验。结果表明:该分级机对2种物料的最小切割粒径分别为6.5、3.3μm;试验中分级粒径为2μm时,FCC和S-Zorb催化剂的牛顿分级效率分别为91.9%和54.1%;径向风的引入破坏了康达效应的形成条件,有利于提高分级效果;进出口压降随着径向气流量的增大而降低;分级机对FCC催化剂的去“细”能力较好,对S-Zorb催化剂的去“粗”能力较好。

关键词：颗粒分级；康达效应；切割粒径；鱼钩效应

Abstract：In order to improve the performance of the cyclone classifier, radial airflow was used to separate the particles once again. The experiments adopt FCC(fluid catalytic cracking)catalyst and S-Zorb catalyst as the material. Five experiments were done in different airflow velocity of radial airflow. The experimental results show that the minimum cut size of FCC catalyst is 6.5 μm and that of S-Zorb catalyst is 3.3 μm. When the cut size at 2 μm, Newton's classification efficiency of FCC catalyst is 91.9% and that of S-Zorb catalyst is 54.1%. The radial airflow destroys the formative condition of Coanda effct, which makes for the classification performance. The pressure drop between inlet and outlet is reducing when the radial airflow rate is rising. This classifier is better to eliminate the fine of FCC catalyst and the coarse of the S-zorb catalyst.

Keywords: particle classification；Coanda effect；cut size；fish-hook effect