摘要：采用计算流体力学(CFD)-离散单元法(DEM)耦合法对催化剂颗粒堆积密度不同的固定床管式反应器内部的流体流动特性进行数值模拟,探索流体在通过床层时速度场、压力场的分布规律。结果表明:增大颗粒下落的初始速度能够增大床层的堆积密度,采用5 m/s的初速度堆积的床层比以自身重力自由填充的床层堆积更多的颗粒,床层的孔隙率减小了6.64%,床层的堆积密度增大了5.48%;堆积密度的增大可使床层的压力降最多增加44.29%,使介质在床层内的停留时间增加,接触时间延长。

关键词：固定床管式反应器；计算流体力学；流动特性；数值模拟

Abstract： The flow characteristics of fluid in a fixed-bed tubular reactor with different packing densities of catalyst particles were simulated using the method of computational fluid dynamics (CFD) -distinct element method (DEM) coupling. The distributions of velocity field and pressure field were explored when the fluid flowed through the bed. The results show that increasing the initial velocity of the falling particles can increase the packing density in the bed. Comparing with the bed filled by its gravity of particles， the number of packing particles increases at the initial speed of 5 m/s， the porosity of bed decreases by 6.64%， and the packing density enhances by 5.48%. The increase of packing density can make the pressure drop rise by 44.29% extremely， the residence time of medium within the bed can be prolonged， and the contact time can be extended. 

Keywords: fixed-bed tubular reactor； computational fluid dynamics； flow characteristic； numerical simulation