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在一套大型冷模实验装置中,考察了喷嘴射流与催化剂逆向接触的提升管进料段固含率和颗粒速度沿径向的分布及其对操作条件的影响,并与传统提升管进料段结构进行对比.结果表明,沿轴向由下至上可将该新型结构的进料段分为喷嘴上游过渡区(H=-0.675～-0.375 m)、喷嘴射流控制区(H=-0.375～0.375 m)及喷嘴下游过渡区(H=0.375～0.675 m).与传统形式相比,新型结构可使进料喷嘴安装截面以上射流影响区的高度明显缩短,喷嘴截面以下影响区域范围增大;油剂初始接触区域内催化剂沿径向的分布更均匀.根据实验结果,得到新型进料段中射流控制区内典型截面固含率径向分布的经验模型,计算值与实验值吻合较好.
In a large-scale cold model experimental apparatus, the radial distribution of solid content and particle velocity of the riser feed section of the nozzle riser and the catalyst in reverse contact with the catalyst and the influence on the operating conditions were investigated. Compared with the conventional riser feed The results show that the feed section of the new structure can be divided into the upstream transition zone (H = -0.675 ~ -0.375 m), the nozzle jet control zone (H = -0.375 ~ 0.375 m) and the transition zone downstream of the nozzle (H = 0.375-0.675 m). Compared with the traditional form, the new structure can significantly shorten the height of the jet impact area above the cross section of the feed nozzle and increase the area below the nozzle cross section, The radial distribution of the catalyst in the initial contact zone of the oil agent is more uniform.According to the experimental results, the empirical model of the radial distribution of the solid content of the typical section in the jet control zone is obtained, which is in good agreement with the experimental data.