REAC出口管道结构优化的数值模拟

Numerical Simulation of the Reac Outlet Pipeline Structure Optimization

针对加氢反应流出物空冷器(REAC)出口管道系统的失效案例,分析出口管道系统的冲蚀机理及影响因素。以实际工况下多相流介质的物性参数为基础,对REAC出口管道进行CFD数值模拟,依据管壁剪切应力分布规律进行工程测厚,测得的冲蚀减薄量与仿真结果基本吻合,模拟冲蚀试验进一步验证了数值模拟的准确性。最后,用该方法对等径弯管和盲三通等结构进行模拟,可知采用等径弯管(DN100 mm)代替盲三通(DN100 mm),可有效提高管道的抗冲蚀能力。

In view of the real case that the hydrocracking Reactor Effluent Air Coolers （REAC） outlet pipeline system often failed, the erosion mechanism is researched and the key influence factors are analyzed based on the actual physical parameters of reactor effluent on actual operating condition. The shear stress is obtained by numerical simulating the outlet pipeline of REAC system using the software CFD. According to the distribution of wall shear stress, the pipeline＇s thickness is measured and the results conform to the shear stress mostly. The experiment that simulates the actual operating mode condition is carried out and the critical shear stress under experimental circumstances is simulated by CFD. The value is in line with that on actual operating condition, which further validates the accuracy of numerical simulation and the engineering measure of thickness. Adopting that method to simulate the structure optimization of elbow ＆, blind tee, the results show that applying the equant elbow （DN100 mm） instead of the blind tee （DN100 mm）can avoid the erosion failure in the pipeline system effectively.