FCC沉降器内不同结构旋风分离系统的模拟分析

发布时间：2018-04-17 11:00

本文选题：FCC沉降器 + Reynolds应力输运模型(RSM)　；参考：《石油学报(石油加工)》2017年06期

【摘要】：FCC沉降器内两级旋风分离系统是石油工业催化裂化过程的重要组成部分。为了分析两级旋风分离系统之间的传递关系,笔者采用Reynolds应力输运模型(RSM)对FCC沉降器内两级旋风分离系统进行两相数值模拟,研究了4种不同结构的流场分布特征及两级分离器间流动不稳定性的相互影响过程。结果表明,粗旋和顶旋采用合理的结构形式能更好地平衡顶旋气流,提高分离效率,降低压力降。料腿底部无约束时,粗旋排出流率较大,顶旋排出流率较小,且各顶旋排出流率并不相同。由粗旋排气管排出的气流仍有旋转特点,使方形直连管下端有漩涡区,出现了多个封闭循环流动的小漩涡,这对顶旋的流动不稳定性有重要的影响。
[Abstract]:The two-stage cyclone separation system in the FCC settler is an important part of the catalytic cracking process in the petroleum industry.In order to analyze the transfer relationship between the two-stage cyclone separation system, the two-phase numerical simulation of the two-stage cyclone separation system in the FCC settler is carried out by using the Reynolds stress transport model.The flow field distribution characteristics of four different structures and the interaction process of flow instability between two stage separators are studied.The results show that the reasonable structure of rough rotation and top spin can balance the top spin flow, improve the separation efficiency and reduce the pressure drop.When the bottom of the feed leg is unconstrained, the rate of coarse swirl discharge is larger, the rate of top spin discharge is smaller, and the rate of top spin discharge is different.The flow from the rough exhaust pipe still has the characteristics of rotation, which makes the bottom end of the square straight pipe have a swirl region, and many small swirls of closed circulation flow appear, which has an important effect on the flow instability of the top spin.
【作者单位】：中国石油大学重质油国家重点实验室;
【基金】：中国石油大学(北京)科研基金项目(2462015YQ0303)资助
【分类号】：TE96

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