中文摘要：

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1．3-2．3m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，

英文摘要：

Solids volume fraction and particle velocity in the pre-lifting structure with two strands of catalyst inlets were studied using optical fiber on a large scale cold model experimental setup. A radial non-uniformity index was applied to describe quantitatively radial distribution of solids volume fraction and particle velocity. The experimental results in different pre-lifting structures were compared. The experimental results show that the pre-lifting structure can be divided into three zones. According to the analysis of radial non-uniformity index of solids volume fraction and particle velocity, the uniformity degree of radial distribution of solids volume fraction and particle velocity decrease in the order of riser region 〉 bottom region 〉 central tube region. The homogeneous distributions of solid volume fraction and particle velocity exist on one section between 1.3 and 2.3 m in the riser. Compared with the pre-lifting structure without central tube and traditional structure, the distribution of solids volume fraction is so homogenous that catalyst particles and oil can react more effectively. Then, empirical models using parameters of terminal solid volume fraction εs＇, Froude number Fr and axial height/riser diameter h/Dr for estimating the axial distributions of averaged cross-sectional solids volume fraction in the pre-lifting structure are obtained based on the experimental data and theoretical analysis, respectively, which agree well with the experimental data.