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过程工程学报 ›› 2017, Vol. 17 ›› Issue (5): 944-951.DOI: 10.12034/j.issn.1009-606X.217127

• 流动与传递 • 上一篇    下一篇

气升式环流反应器内气液固三相流的数值模拟

徐斌1,余健1,舒德华2,尹德才1   

  1. 1. 湖南大学土木工程学院，湖南 长沙 410082；2. 中国地质工程集团公司，北京 100093
  • 收稿日期:2017-02-09 修回日期:2017-03-06 出版日期:2017-10-20 发布日期:2017-10-10
  • 通讯作者: 余健 yujianpro@126.com
  • 基金资助:
    国家水体污染控制与治理科技重大专项

Numerical Simulation of Gas-Liquid-Solid Three-phase Flow in Airlift Loop Reactor

Bin XU1,  Jian YU1*,  Dehua SHU2,  Decai YIN1     

  1. 1. College of Civil Engineering, Hunan University, Changsha, Hunan 410082, China; 
    2. China Geo-engineering Corporation, Beijing 100093, China
  • Received:2017-02-09 Revised:2017-03-06 Online:2017-10-20 Published:2017-10-10

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摘要： 以Fluent中的欧拉三相流模型为基础，采用改进的曳力模型对连续式三相气升式内环流生物反应器进行二维非稳态数值模拟，模拟反应器降流区时均液体循环速度和最大液体循环速度，不同曝气量和石英砂含量下的气含率及曝气量10.2 L/min、石英砂含量2 L时苯酚在反应器内的扩散过程. 结果表明，模拟结果与实测值吻合较好. 用该模型模拟固相密度为1200, 1500, 1800, 2220 kg/m3、固相颗粒粒径为0.3, 0.6, 0.9 mm条件下降流区的时均液体循环速度，较小的密度和粒径有助于提高液体循环速度.

关键词: 曳力模型, 三相流, 非稳态, 数值模拟

Abstract: Based on the Euler three-phase model in Fluent, the improved drag model was applied to the two-dimensional unsteady numerical simulation of continuous three-phase airlift inner-loop bioreactor. The improved model was applied to simulating the time-averaged liquid velocity in the downcomer, the maximum liquid velocity, the gas holdups under different aeration rates and different volumes of sand and the diffusion process of phenol when the aeration rate was 10.2 L/min and the volume of sand was 2 L. The result showed the simulated values of liquid velocity, gas holdups and the diffusion process were consistent with the experiment results. Then the time-averaged liquid velocity in the downcomer was simulated with the improved model when the solid density was 1200, 1500, 1800, 2220 kg/m3, respectively, and particle sizes was 0.3, 0.6, 0.9 mm, respectively. The time-averaged liquid velocity increased with the solid density and the particle sizes decreasing.

Key words: drag model, three-phase flow, unsteady state, numerical simulation