加氢裂化空冷器管束衬管结构的优化设计

基于FLUENT平台对加氢裂化装置空气冷却器管束入口衬管的直角尾部结构对流动的影响进行了数值分析。结果表明，尾部直角结构使流体在该处产生漩涡，并对下游一定区域造成影响，在衬管尾部后区域产生的高剪应力区加强了流体对换热管壁的冲刷作用。对90°直角、45°倒角及1∶10锥度三种衬管尾部结构进行对比分析表明，45°倒角结构优于直角结构，而1∶10锥度结构最佳。

OPTIMIZATION DESIGN OF LINING TUBE IN HIGH PRESSURE AIR COOLER BUNDLE FOR HYDROGENATED CRACKING UNIT

In this paper the numerical calculation based on FLUENT is executed to study the influences of the end structure of lining tube (in high pressure air cooler bundle of hydrocracking unit) on fluid flow. Results show that the lining tube end with 90? right-angle structure will cause vortex in fluid which may affect downstream area by forming fluid flow with high shearing force to scour the heat-exchange tube. Comparison among lining tube end with 90? right-angle, 45? chamfer and 1:10 taper is carried out and the results show that lining tube end with 1:10 taper is the best end structure. However, end with 45? chamfer is better than end with 90? right-angle structure.