基于流动分析的加氢空冷系统氯化铵沉积规律研究

针对含氯原料油加工引发加氢高压空冷系统管束失效的典型案例，建立工艺过程模型，运用CFD软件对反应流出物空冷器中的第一排管束进行流动场数值模拟，获得空冷器管束壁面的气相分率、多相流流速及壁面的剪切应力的分布规律，提出由铵盐结晶沉积引起的垢下腐蚀是造成REAC第一排管柬顶部失效的主要原因。仿真结果与现场失效案例的比较，验证了模型和结论的正确性，相关结果可为加氢空冷器管束及复杂管道系统的失效分析和优化设计提供依据。

Research on Ammonium Chloride Deposition Rules Based on Flow Analysis in Hydrogenation Air Cooling System

Aimed at the typical frequent failure cases of hydrogenation high-pressure air cooling system caused by the process of chlorine raw material oil through the process modeling and CFD software, the flow field numerical simulation for bundle of first row in reactor effluent air coolers is carried out. The vapor phase rate, multi-phase velocity and the distribution of shear stress on wall is obtained, so it is pro posed that the under-deposit corrosion which caused by ammonium chloride is the main reason of the bundle top failure of reactor effluent air coolers first row. The correctness of the model and conclusions are verified by the comparison between the simulation results and the failure cases. The research conclusion provides the basis for failure analysis and optimization design in hydrogenation air coolers＇ bundle and complex piping system.