FCC沉降器内粗旋与顶旋连接结构的优化

 采用Reynolds应力输运模型和随机轨道模型对催化裂化沉降器内的流动状况进行了全尺寸的数值模拟，考察了不同的粗旋与顶旋分离器的连接结构对沉降器内流动状况的影响。为了反映真实的流动过程，计算中没有对沉降器空间和两级旋风分离器的复杂结构进行简化，并基本实现了完全结构化的网格划分。结果表明，粗旋分离器排气管出口的导流段有助于排出的油气直接进入顶旋分离器，降低进入沉降器的油气量，并减少油气在沉降空间内的停留时间，降低了沉降器内发生结焦的可能性，为优化沉降器结构的设计提供了新的方法。

OPTIMIZATION OF LINKAGE STRUCTURE BETWEEN PRIMARY AND SECONDARY CYCLONE SEPARATOR IN THE FCC DISENGAGERS

A full-size numerical simulation was carried out. Reynolds Stress Model (RSM) and Stochastic Tracking Model were applied to simulate the flow in a FCC disengager. The effect of different linkage structure between primary cyclone separator and secondary cyclone separator on the flow behaviour was studied. In order to obtain the precise flow behaviour, there was no structure simplification for the space inside the two-stage separator and outside the separators in the disengager. It was shown that the diversion section in the outlet of primary cyclone separator contributed to oil gas flowing into the inlet of secondary cyclone separator. Consequently, this construction could effectively reduce the quantity of the oil gas going into the disengager, and reduce the residence time of oil gas in the disengager, which prevent the generation of the cook in the disengager. All these work can provide references to optimize the design of FCC disengager.