纤维和小颗粒填充滴流床的流体力学性能比较

A COMPARISON ON THE HYDRODYNAMICS BETWEEN A FIBER-PACKED TRICKLE-BED AND A TRICKLE-BED OF SMALL PACKINGS

在内径为０．０４７ｍ的有机玻璃管内，采用空气－水为介质，对纤维（碳纤维、玻璃纤维、氧化铝纤维）、小玻璃珠（１．８ｍｍ，３．１８ｍｍ）填充滴流床的流体力学性能进行了考察。结果表明，因为均为滴流床，流体力学性能有某些相似之处，但又由于纤维和小玻璃珠存在不同的性质和尺寸，滴流床内流道结构的巨大差异，使得两种床层内流体操作范围、床层空隙率、流型过渡、床层压降、持液量、流体力学滞后现象等都存在显著差异。

The hydrodynamics of a fiber-packed trickle-bed and a trickle-bed of small packings were investigated in a trickle-bed of 0. 047m id. and 0. 7m height at room temperature and atmospheric pressure, in the range of liquid superficial velocity 3.2×10-4 to 1. 47×10-2m/s, with gas superficial velocity varying from 4.21×10-2 to 1.94×10-1m/s. The results showed that there are some similarities and also notable differences in hydrodynamics between the two trickle-beds, such as bed porosity, flow patterns, pressure drop, liquid holdup, the hydrodynamic hysteristies, et al.