FCC沉降器内粗旋出口导流长度对油气流动的影响  

EFFECT OF DIVERSION SECTION LENGTH OF PRIMARY CYCLONE SEPARATOR OUTLET ON OIL GAS FLOW IN THE FCC DISENGAGERS

作　　者：王江云[1] 毛羽[1] 王娟[1] 

机构地区：[1]中国石油大学重质油国家重点实验室,北京102249

出　　处：《石油学报（石油加工）》2009年第6期784-789,共6页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：国家重点基础研究发展计划"973"项目(2004CB217803)资助

摘　　要：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,考察了粗旋分离器排气管出口导流段长度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;随着导流段长度的增加,直接进入顶旋的油气量也随之增加,而粗旋和顶旋分离器的压降基本不变,对反应器内的压力平衡基本没有影响。A full-size numerical simulation of the flow in FCC disengager was carried out by applying Reynolds stress model （RSM） and stochastic tracking model. The effects of the diversion section length at the outlet of primary cyclone separators on the flow behaviour in disengager were studied. In order to obtain the precise flow behaviour, there was no structure simplification for the spaces inside and outside the two stage separator system of the disengager. It was shown that the diversion section at the outlet of primary cyclone separator made oil gas direct flowing into the secondary cyclone separator, effectively reducing the oil gas quantity going into the disengager and residence time of oil gas in disengager, which could prevent the coke generation. And with the increase of the diversion section length, the quantity of oil gas directly flowing into the secondary cyclone separator was gradually growing up. At the same time, pressure drop of primary and secondary cyclone separator was almost invariable, the effect of which on the pressure balance of disengager was very little.

关 键 词：FCC沉降器 导流段 长度 旋风分离器 流动 数值模拟 

分 类 号：TE624[石油与天然气工程—油气加工工程]