原生纳米颗粒SiO_2中添加大粒径组分的流化性能

Fluidization State of Primary Nano-Particles SiO_2 Mixed with Large Particles

以平均原生粒径为 10nm的SiO2 为原料 ,采用添加较大球形玻璃珠颗粒的方法 ,在内径为6 0mm的有机玻璃流化床中 ,考察了在不同添加量和不同添加颗粒粒径的情况下 ,纳米颗粒SiO2 的流化性能。实验表明 ,纳米颗粒SiO2 的流化经历了沟流、节涌、破碎和聚团 4个阶段 ,但当添加玻璃珠的量大于10∶1或添加玻璃珠粒径不大于 0 13mm时 ,SiO2 的流化质量较好 。

The process of fluidizing primary nano-particles of 10 nm SiO 2 powder was investigated in a small-scale transparent column with 60 mm I.D. In this experiment, three different diameters of spherical glass particles were chosen as the additional component. Experiments indicated that the process of fluidizing primary mano-particles involves channeling, slugging, disrupting, agglomerating. Moreover, the fluidization quality can be greatly improved when the primary nano-particles was mixed with the spherical glass beads. At the same time, the fluidization quality of the powder can be shown by the curves of pressure drop across the bed.