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在一套大型冷模实验装置上,采用光纤测量系统考察了带中心管的两股催化剂颗粒混合预提升结构内固含率和颗粒速度的分布,以径向不均匀指数对固含率和颗粒速度径向分布进行定量描述,并与不同的预提升结构进行对比.结果表明,带中心管的预提升结构沿轴向可分为底部、中心管和提升管区,各区固含率和颗粒速度径向分布均匀程度为提升管区>底部区>中心管区;提升管区内1.3~2.3 m间存在一固含率和颗粒速度分布均匀截面;与无中心管的预提升结构和传统预提升结构相比,本实验结构固含率径向分布更均匀,有利于油剂接触;确定了截面平均固含率的影响参数为终端固含率εs’,Froude数Fr和轴向高度/提升管直径h/Dr;由实验数据回归出预提升结构内截面平均固含率轴向分布的经验模型,计算值与实验值吻合较好.
In a large-scale cold model experimental apparatus, the optical fiber measurement system was used to investigate the distribution of solid content and particle velocity in the mixed pre-lifting structure with two catalyst pellets with a central tube. The radial non-uniform index Speed radial distribution and compared with different pre-lifting structures.The results show that the pre-lifting structure with center pipe can be divided into bottom, center pipe and riser zone in the axial direction, solid content and particle velocity of each zone The distribution area is uniform, the pipe area> bottom area> central pipe area; the uniform distribution of solid content and particle velocity between 1.3 ~ 2.3 m in the riser area; compared with the pre-lifting structure without center pipe and the traditional pre-lifting structure, The experimental structure of the solid content distribution more uniform radial conducive to oil contact; determine the average cross-sectional solid content of the solidification rate of the parameters of the terminal solid content εs’, Froude number Fr and axial height / riser diameter h / Dr The empirical model of the axial distribution of the average solid content of the inner cross section of the pre-hoisting structure is derived from the experimental data. The calculated values are in good agreement with the experimental values.