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运用一种新型的隔离稀相床层塌落技术,研究了3种不同平均粒径的FCC催化剂流化床层的塌落特性和高表观操作气速条件下床层的乳相结构。实验采用摄像技术,记录了细颗粒床层的塌落过程,获得了床层料面的塌落曲线。考察了颗粒流化床层的乳相和泡相特性,并进一步分析了平均粒径对颗粒床层塌落性质的影响。实验结果表明:在操作气速较高的条件下,在所选用的粒径范围内,平均粒径为30μm左右的FCC催化剂颗粒的塌落时间最长,乳相密度最小,泡相体积分率亦明显高于较粗颗粒的对应值。这些结果表明平均粒径为30μm左右的FCC催化剂颗粒具有比较独特的流化性能。
Using a new type of isolated dilute bed slump technology, the slump characteristics of three FCC fluidized bed with different average particle sizes and the emulsion phase structure under high apparent operating gas velocity were studied. The experiment adopts the camera technology to record the slump process of the fine granular bed and obtain the slump curve of the bed material surface. The characteristics of the emulsion phase and the bubble phase of the fluidized bed were investigated. The influence of the average particle size on the slump properties of the granular bed was further analyzed. The experimental results show that under the condition of high operating gas velocity, FCC catalyst particles with the average particle diameter of about 30μm have the longest collapse time, the smallest emulsion density and the lowest bubble volume fraction Also significantly higher than the corresponding value of coarser particles. These results indicate that FCC catalyst particles having an average particle size of about 30 μm have relatively unique fluidization properties.