导流及布气方式对膜生物反应器内部流场影响的数值模拟分析 |
作者:罗 南1,王 捷1,2,贾 辉2,耿全月1 |
单位: 1.天津工业大学 环境与化学工程学院,天津 300160;2. 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 300160 |
关键词: 膜生物反应器;数值模拟;导流曝气;膜污染 |
DOI号: |
分类号: |
出版年,卷(期):页码: 2012,32(4):54-60 |
摘要: |
本文运用数值模拟,研究了膜生物反应器中曝气管路布气位置及导流板对反应器内流场分布的影响,并对三种气水比(10:1、15:1、20:1)进行了优化研究。将模拟结果进行比较发现:“对齐”布气优于“间隔”布气;导流板对反应器内流场特性有较明显的影响,导流作用能有效的改善反应器内气含率的分布状况,提高氧传质效率,增大膜面剪切速度。在相同条件下,其平均膜面剪切速度分别是不加导板的1.5-1.9倍。当气水比为15:1时,各种布气方式反应器内气含率分布均较大,流场内的涡流均非常明显,整个场内形成了循环流动,膜面剪切速度也达到最大。 |
Applying two-dimensional computational fluid dinamics simulation in this paper, the effect of the location of the aeration pipeline and the deflector on the mixture of air and water within the flow field in membrane bioreactor were studied and three kinds of gas-water ratio (10:1, 15:1, 20:1) were optimized. Through analysis and comparison, it is shown that the "alignment" gas distribution better than "interval"; The deflector has a obvious effect on the flow field in the reactor,it can effectively improve the reactor gas holdup distribution and the oxygen transfer efficiency, increasing membrane surface rate . The average shear rate were 1.5 ~ 1.9 times higher than that without baffles under the same condition. And when the gas-water ratio is 15:1, the gas holdup distribution of all kinds of ways are large, the vortex in the flow field are very obvious, a circular flow can form in the whole field,the membrane surface rate is the highest. |
基金项目: |
国家自然科学青年基金(50908161),973前期研究专项(2011CB612311),国家水体污染控制与治理科技重大专项(2008ZX07314-003) 作者简介: |
作者简介: |
罗南(1987-),女,湖南衡阳人,硕士研究生,主要从事膜应用方面的研究工作。 |
参考文献: |
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