管型结构对提升管流动特性的影响

采用边壁补气模拟重油催化裂化提升管反应装置中气体的膨胀行为，通过比较直管型提升管和锥型提升管中的气–固流动行为，研究了锥形提升管结构对油气膨胀所带来的流动特征变化的适应与改善. 实验结果表明，相对于直管型提升管，锥型提升管对流化气量的变化有较好的适应能力，且能有效地改善床层内的颗粒速度、空隙率的径向分布以及压力的轴向分布.

Influence of Riser Shape and Configuration on Flow Characteristics in the Riser

The rapid expansion of oil gas has large influence on the operating performance and flow characteristics in the riser of FCCU. In the present work, the effect of riser shape on flow characteristics and the suitability of conical riser (diffuser) for expanding oil-gas flow were investigated. Auxiliary gas was introduced into the riser to imitate the expansion of oil gas in the riser in experiments. The axial profile of pressure and the radial profiles of particle velocity and voidage were measured. Comparison of experimental results in the tube-riser and the conical-riser shows that the particle concentration in the conical riser is almost uniform, pressure drop is lower than that in the tube riser, and flow characteristics are greatly improved. It seems that the conical riser (diffuser) has the advantage of operating flexibility over the tube riser, and is suitable for the rapid expanding oil gas.