Abstract:

The axial and radial profiles of the gas holdup and bubble parameters in an external-loop airlift reactor of inner diameter 0.09 m and height 1.8 m were measured with the differential pressure method and dual-tip electrical conductivity probe at different superficial gas velocities.Air and water were used as the gas and liquid phases，respectively.The experimental data of the average and local gas holdups，bubble size and its distribution，bubble rising velocity，bubble frequency and gas-liquid interfacial area were obtained，and were analyzed based on the gas-liquid flow field and bubble-bubble interaction.The local gas holdup was correlated in terms of superficial gas velocity，axial height and radial position based on the experimental data.

Key words:

气升式外环流反应器, 气含率, 气泡尺寸分布, 轴径向分布, 双探针电导探头

摘要： 在气升式外环流反应器（Φ 0.09 m×1.8 m）内，利用压差法和双探针电导探头技术考察了不同表观气速下空气-水两相体系中气含率及气泡参数随轴径向位置的变化规律，测得了平均及局部气含率、气泡尺寸及分布、气泡上升速度、气泡频率以及气液相界面积，并从气液流场特征及气泡间相互作用等方面对实验结果作出分析。基于实验数据拟合出局部气含率随表观气速和轴径向位置的关联式。

关键词:

气升式外环流反应器, 气含率, 气泡尺寸分布, 轴径向分布, 双探针电导探头