膜曝气生物膜反应器内流场的CFD模拟及组件优化_吴云

2015年1月 CIESC Journal ·402·

January 2015第66卷 第1期 化 工 学 报 V ol.66 No.1

膜曝气生物膜反应器内流场的CFD 模拟及组件优化

吴云1,2，张楠2，张宏伟1,2，贾辉1,2

（1天津工业大学中空纤维膜材料与膜过程教育部重点实验室，天津 300387；

2

天津工业大学环境与化学工程学院，天津 300387）

摘要：基于数值模拟的方法研究了不同填充方式、填充密度、循环流量下膜曝气生物膜反应器（MABR ）内流场特性。研究结果表明，随机填充时，反应器内存在偏流沟流现象，且进口处动能损失大；规则填充时，截面流速稳定区域较长，更适于MABR 生物膜的生长。填充密度对MABR 壳程速度场的影响显著，并且存在一最佳值；当填充密度为30%时，反应器整体速度场比较均匀稳定。实验采用三维电磁测速仪对实体模型进行流场测量，得到反应器内流场速度与模拟值接近，误差小于10%；当循环流量为7.62 L ·min −1时，反应器截面平均流速可以维持在0.026 m ·s −1，并且进口最大流速低于0.20 m ·s −1，不会导致生物膜的脱落，该稳定的流场分布符合MABR 内部的速度场分布需求。

关键词：MABR ；生物膜；数值模拟；流场特性；优化 DOI ：10.11949/j.issn.0438-1157.20140975

中图分类号：X 52 文献标志码：A

文章编号：0438—1157（2015）01—0402—08

CFD simulation of internal hydrodynamic characteristics and optimization of

membrane module in membrane aerated biofilm reactor

WU Yun 1,2, ZHANG Nan 2, ZHANG Hongwei 1,2, JIA Hui 1,2

（1State Key Laboratory of Hollow Fiber Membrane Materials and Processes, Tianjin Polytechnic University , Tianjin 300387, China ;

2

School of Environmental and Chemical Engineering , Tianjin Polytechnic University , Tianjin 300387, China )

Abstract: Based on numerical simulation, the internal hydrodynamic characteristics of membrane aerated biofilm reactor (MABR), was investigated at different filling modes, packing densities, and circulation flow rates. With random packing, bias flow and channeling were present, causing great loss of kinetic energy at the entrance of the reactor. However, with even packing, the stability region of cross-section velocity was longer, which was more suitable for the growth of biofilm in MABR. The effect of packing density on the shell flow field of MABR was fairly remarkable, and there was an optimal value. With packing density of 30%, flow field was stable. Three-dimensional electromagnetic tachymeter was used to measure the flow field of the physical model, and the measured velocity was close to the simulated value, with error less than 10%. With circulation flow rate of 7.62

L ·min −1, cross-section velocity of the reactor could be kept at 0.026 m ·

s −1, meanwhile maximum inlet velocity of the reactor was less than 0.20 m ·s −1, which would not cause fall-off of biofilm. Stable flow field distribution accorded with the requirements of internal flow field of MABR.

Key words: MABR; biofilm; numerical simulation; flow field characteristics; optimization

2014-06-27收到初稿，2014-09-10收到修改稿。

联系人及第一作者：吴云（1980—），男，博士，副教授。 基金项目：国家自然科学基金项目（51108316，51378349）。

Received date : 2014-06-27

Corresponding author : WU Yun, wucloud@

Foundation item : supported by the National Natural Science Foundation of China(51108316,51378349).