双维弦波聚结板分离器的数值模拟及结构优化

发布时间：2018-05-08 12:02

  本文选题：油水分离 + 双维弦波波纹板　； 参考：《天津大学》2015年硕士论文

【摘要】：所谓含油污水,主要的污染物是不溶于水或在水中溶解度很低的有机化合物。含油污水来源广泛,危害严重,其除油效果对后续工艺过程影响很大。工程应用中,将重力分离与聚结技术两项技术结合的聚结板分离器,以其独特的环境友好、造价低廉和高效紧凑的优势而备受重视。本文自行设计双维弦波聚结板分离器,首次应用双维弦波波纹板作为聚结板结构,并对板表面进行了表面改性处理,用以强化油水分离。通过数值模拟,揭示双维弦波波纹板的特殊结构与表面改性对油水分离效果的影响。对双维弦波波纹板的流动性能模拟时,首先,定性比较工程中常用的三种波纹板流道内流体的流动行为,发现弦波形板流道内出现回流及漩涡的速度阈值较另外两种板大。其次,引入纵宽比γ、纵横比λ两个几何因子,在适应油水分离的流速范围内,当γ,λ≤1时,弦波波纹通道的几何形状对流体的流动影响很小,流体可顺利地流过波纹通道且不出现漩涡。最后,对四种不同波纹板形式的聚结板分离器(Stokes-Pak、Plate-Pak、V形斜置、双维弦波)进行整体油水分离效果的影响,得出双维波形式的聚结板分离器分离效果明显好于单向波形式的聚结板分离器,并且双维弦波聚结板分离器的分离效果稍好于V形斜置聚结板分离器。对双维弦波波纹板的表面改性模拟时,在油水分离模拟过程中首次引入分散相对波纹板壁面的接触角设置,对于某一相而言,接触角θ90°表示润湿,接触角θ90°,表示不润湿。发现经过表面改性后,波纹板表面对油相的支持增强,油水界面过渡层厚度减薄,底部油相聚集区域增大,分离效果得到改善。最后,运用响应面分析法对聚结板分离器的高效分离区尺寸进行优化,为进一步开发高效紧凑的工业化聚结板分离器提供了参考。
[Abstract]:The so-called oily sewage, the main pollutant is insoluble in water or low solubility in water organic compounds. The oily wastewater has a wide range of sources and serious harm, and its oil removal effect has a great influence on the subsequent process. In engineering application, the agglomeration plate separator, which combines gravity separation and coalescence technology, has attracted much attention because of its unique advantages of friendly environment, low cost and high efficiency and compactness. In this paper, the double dimensional chord wave coalescence plate separator is designed by ourselves. For the first time, the double dimensional chord wave corrugated plate is used as the structure of the agglomeration board, and the surface of the plate is modified to strengthen the separation of oil and water. The special structure of double dimensional chord corrugated plate and the influence of surface modification on oil / water separation were revealed by numerical simulation. When simulating the fluidity of two-dimensional chord corrugated plate, firstly, the flow behavior of three kinds of corrugated plate in the channel is qualitatively compared, and the velocity threshold of reflux and swirl in the channel of chord corrugated plate is larger than that of the other two kinds of plates. Secondly, in the range of flow velocity suitable for oil and water separation, when 纬, 位 鈮，

本文编号：1861320