膜生物反应器近膜面流场特性实验研究  

Experimental study on flow field characteristics on the surface of membrane module in the MBR

作　　者：李春丽[1] 邢世录[1] 陶中兰[1] 文佳龙[1] 田瑞[1] 

机构地区：[1]内蒙古工业大学能源与动力工程学院,呼和浩特010051

出　　处：《膜科学与技术》2013年第2期63-69,共7页Membrane Science and Technology

基　　金：国家自然科学基金资助项目(50766002);内蒙古自然科学(重大)基金(2010ZD09)

摘　　要：利用PIV技术测试了膜面附近的气液两相流动力学特性,在2.5m^3/h曝气强度下,对1、2、3 mm三种曝气孔径条件下的气泡动力学特性进行了研究,同时分析了不同孔径下对应的液相速度场、涡量场和雷诺应力分布规律.结果表明,在曝气强度较低的情况下,孔径大小是影响气泡大小的重要几何因素,3mm孔径所形成的气液两相流中液相速度、涡量值和雷诺应力均是最大的,表现在膜过滤过程中,能更好地促进膜表面浓差极化层的物料混合.This article built a pilot scale membrane bioreactor system,and Particle Image Velocimetry（PIV） technology was used to measure the dynamic characteristic of the gas-liquid two-phase flow around membrane fibers. The dynamic characteristic of bubbles was researched in the condition of aeration intensity 2. 5 m^3/h and three bore diameters of 1, 2, 3 mm. This paper analyzed liquid phase flow field, vorticity field and Reynolds stress in the three bore diameters. It is shown that bore diameter size is a important geometric factor affecting bubble size in a given lower aeration intensity. The velocity, vorticity and Reynolds stress of liquid flow field are the largest in 3 mm bore diameter and it can better promote the material mixing of concentration polarization layer at the membrane surface.

关 键 词：膜生物反应器 气液两相流 粒子图像测速技术 曝气孔径 气泡动力学特性 

分 类 号：TQ028.8[化学工程] X703.1[环境科学与工程—环境工程]