催化裂化再生器树枝状气体分布器的气相流场CFD模拟  

CFD SIMULATION OF GAS FLOW FIELD IN GAS PIPE DISTRIBUTOR IN REGENERATOR OF FCCU

作　　者：杨连[1] 严超宇[1] 魏志刚[1] 魏耀东[1] Yang Lian Yan Chaoyu Wei Zhigang Wei Yaodong(State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249)

机构地区：[1]中国石油大学(北京)重质油国家重点实验室,北京102249

出　　处：《石油炼制与化工》2016年第12期64-69,共6页Petroleum Processing and Petrochemicals

基　　金：国家自然科学基金资助项目(21176250);中国石油大学(北京)科研基金资助项目(2462015YQ0301)

摘　　要：催化裂化装置再生器的气体分布器通常采用树枝状气体分布器,这种分布器存在着气体分布不均匀和喷嘴的冲蚀磨损问题。为此,对树枝状气体分布器区域进行计算流体力学(CFD)模拟,重点考察分布器内气相流场的特征。计算结果表明:树枝状气体分布器的各分支管内气体速度根据分支管的长度不同存在很大的变化,而且分支管沿程各喷嘴出口的气体流量也不同,导致喷嘴出口气流平均速度存在很大的不均匀性;此外,气体在分支管入口处以及近分支管入口端的喷嘴处存在偏流现象,压力分布不均匀,易产生催化剂倒吸现象,造成喷嘴的冲蚀磨损。A gas pipe distributor is widely used in regenerator of FCCU. However, there are problems of gas maldistribution and nozzle erosion in the pipe distributor. Therefore, the gas flow field in pipe distributor was simulated by using the CFD commercial software. The result shows that the gas velocity in each branch tube is different, depending on the length of the tube. The gas flow rate through each nozzle is also different which leads to a big inhomogeneity of gas distribution. In addition, there exists an obvious deflective flow at the inlet side of nozzle tube and a non-uniform of pressure distribution, which may cause low pressure drop of nozzle, leading to catalyst entrainment into banching pipe and erosion.

关 键 词：催化裂化 树枝状气体分布器 数值模拟 气相流场 布气性能 

分 类 号：TE96[石油与天然气工程—石油机械设备]