通过大型冷模实验研究了喷嘴射流与催化剂逆向接触的新型提升管进料段内喷嘴射流浓度沿径向的分布，考察了喷嘴气速、预提升气速的影响. 结果表明，喷嘴气速Uj=78.5 m/s和预提升气速Ur=4.1 m/s条件下可获得较好的油剂混合效果. 与传统形式相比，新型结构可促进油剂混合，在轴向距离H<0.7 m内完成油剂混合，油剂初始接触区域内喷嘴射流相浓度分布更均匀. 给出了新型进料段中不同区域喷嘴射流浓度沿径向分布的经验模型，计算值与实验值吻合较好.

The radial distribution of feed jet gas concentration in a new type of novel riser in which the jet gas and catalyst contact countercurrent in the injection zone was studied in a large-scale cold mold, and the effects of pre-lift gas velocity and jet gas velocity analyzed. The results show that higher jet gas velocity (Uj=78.5 m/s) and higher pre-lift gas velocity (Ur=4.1 m/s) should be taken in order to obtain a better mixing of feed oil with catalyst particles in the proposed feed injection scheme. Compared with the traditional one, the feed oil can mix with the catalyst particles in a shorter axial distance (H<0.7 m) in the new feed injection structure, which is a great improvement in the promotion of oil mixing. Besides, the distribution of feed jets in the initial contact area of the oil with catalyst is more uniform. Based on the main influential factors of feed jet gas concentration ( , l, q), the empirical formulae for estimating the distributions of jet gas concentration in different zones are established. The calculated results agree well with the experimental data.