添加FCC粗颗粒后纳米颗粒聚团流态化性能

摘要

The fluidization behavior of SiO2, TiO2, ZnO nanoparticles by adding FCC (fluid catalytic cracking) coarse particles was studied. The core-shell structure model was put forward. Some nanopar-ticles can be fluidized by forming core-shell structure agglomerates with FCC coarse particles. So the fluidization performance of three kinds of nanoparticles was improved after adding FCC coarse particles. The results showed that the porosity of core-shell structure agglomerates was below 0.5, and the average roundness value was around 0.5. All the porosity of pure nanoparticles agglomerates was above 0.9, and the average roundness value was around 0.7. In addition, the viscosity of the core-shell structure ag-glomerates was far less than the that of agglomerates only formed by nanoparticles. Therefore, the fluidi-zation behavior of core-shell structure agglomerates was better than that of agglomerates only formed by nanoparticles.%本文研究了SiO2,TiO2, ZnO纳米颗粒添加FCC(流化催化裂化的催化剂)粗颗粒后的流化性能，提出了核壳结构模型。结果表明，添加FCC粗颗粒时三种纳米颗粒的流化性能得到明显改善，部分纳米颗粒与FCC粗颗粒形成核壳结构聚团，并以这种形式进行流化。流化过程中FCC粗颗粒与三种纳米颗粒形成的核壳结构聚团的空隙率在0.5以下，圆形度的平均值在0.5左右；而纯纳米颗粒聚团的孔隙率都在0.9以上，圆形度平均值在0.7左右。另外，核壳结构聚团的粘性远远小于纯纳米颗粒聚团的粘性。因此，核壳结构聚团的流化性能优于纯纳米颗粒聚团。