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化工学报  2015 

膜曝气生物膜反应器内流场的CFD模拟及组件优化

DOI: 10.11949/j.issn.0438-1157.20140975, PP. 402-409

Keywords: MABR,生物膜,数值模拟,流场特性,优化

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Abstract:

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7.62L·min-1时,反应器截面平均流速可以维持在0.026m·s-1,并且进口最大流速低于0.20m·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。

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