Abstract:

Catalytic cracking reactor is an important reactor for deep processing of petroleum. In this paper, the gas-solid two-phase flow characteristics in a novel fast fluidized bed catalytic cracking reactor were studied by experimental method, and the particle concentration in the bed was measured, the effect of gas flow rate on the axial and radial distribution of particle concentration was investigated. The results show that the axial particle concentration in the bed presents a dense and sparse distribution in the lower part, an S-shaped distribution of axial particle concentration when the gas flow rate is low, and an exponential distribution when the gas flow rate is high, the particle concentration distribution in the upper part of the reactor has little effect, and the particle concentration distribution in the radial direction of the bed has the characteristics of sparse center and dense side wall, and the radial distribution tends to be uniform with the increase of air flow rate. Under a certain operating condition, the solids concentration of the novel fast fluidized bed is significantly increased compared with the conventional riser.

Key words: catalytic cracking, fast fluidized bed, diameter-enlarged section, solids concentration

摘要：

催化裂解反应器是石油深度加工的重要反应器，采用实验方法对新型快速床催化裂解反应器内气固两相流动特性进行了研究，测量了床层内颗粒浓度分布，考察了气体流量对床层轴向和径向上颗粒浓度分布的影响。实验结果表明，床层轴向上颗粒浓度呈现下部稠密上部稀疏的分布规律；当气体流量较低时轴向颗粒浓度呈S形分布，高气量下呈现指数函数形分布，即反应器上部区域的颗粒浓度分布影响较小；床层径向颗粒浓度分布呈现中心稀、边壁浓的特征，且增大空气流量，径向分布趋于均匀。在一定操作条件下，与传统提升管相比，新型快速床颗粒浓度显著提高。

关键词: 催化裂解, 快速流化床, 扩径段, 颗粒浓度