| 螺旋迭错式空间全曲面生物填料流场模拟分析 |
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| 引用本文： | 汪家琼,孔繁余,吴敬忠,薛玲. 螺旋迭错式空间全曲面生物填料流场模拟分析[J]. 化工学报, 2011, 62(7): 1866-1872. DOI: 10.3969/j.issn.0438-1157.2011.07.012 |
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| 作者姓名： | 汪家琼 孔繁余 吴敬忠 薛玲 |
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| 作者单位： | 江苏大学流体机械工程技术研究中心；苏州波塞顿节能环保工程有限公司 |
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| 基金项目： | 国家自然科学基金项目,江苏大学高级专业人才科研启动基金项目 |
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| 摘 要： | 引言填料是生物膜法装置的核心组成部分,除了提供生物膜生长的环境,还能过滤水中悬浮物.本课题组于2009年开发出了一种具有螺旋迭错式空间全曲面结构的生物填料(专利号:200920256153.7.以下简称空间全曲面填料).其结构如图1所示,由波纹状的三维全曲面结构PVC薄片构成,具有近似圆锥状的孔隙,使水流紊乱,产生许多旋涡.旋涡使浮游物依密度分离,滞留在填料内部的不同位置,其中含有细菌、真菌、藻类、原生动物和后生动物等微生物,这些微生物与填料表面结合并大量繁殖,从而形成生物膜(挂膜).大颗粒悬浮物易于被波纹状的孔隙拦截,孔隙率高(根据填料大小在82%～92.4%之间),过滤阻力小,可高效、顺畅地进行过滤.
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| 关 键 词： | 螺旋迭错式 生物填料 流场分析 剪应力 |
Simulation analysis of flow-field of spiral stagger spatial-full-surface biological filler |
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| WANG Jiaqiong,KONG Fanyu,WU Jingzhong,XUE Ling. Simulation analysis of flow-field of spiral stagger spatial-full-surface biological filler[J]. Journal of Chemical Industry and Engineering(China), 2011, 62(7): 1866-1872. DOI: 10.3969/j.issn.0438-1157.2011.07.012 |
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| Authors: | WANG Jiaqiong KONG Fanyu WU Jingzhong XUE Ling |
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| Abstract: | To study the purification mechanism of spiral stagger spatial-full-surface biological filler and effects of average filtration velocity,water depth,filler size on bio-film growth performance of the filler,the flow field on its surface was simulated by numerical analysis. Average filtration velocity was from 0.2 m·s-1 to 1.0 m·s-1,water depth was from 0 to 2 m and filler size rate was from 0.5 to 2. Within the study range,the result indicated that at a low liquid velocity and low shear stress(<50 Pa)on most surface of the biological filler except the blade neck( shear stress was above 50 Pa),there was sufficient effective surface area for bio-film growth. The narrowest part in the flow was at the blade neck,where the velocity of liquid and suspended particles was high,so there was fewer opportunities of blockage. The shear stress on the filler surface increased gradually with average filtration velocity varying from 0.2 m·s-1 to 0.8 m· | |
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