聚结板强化油水分离过程的机理研究

发布时间：2018-06-06 15:01

本文选题：油水分离 + 聚结平板　；参考：《工程科学与技术》2017年03期

【摘要】：为从分散相油滴聚结机理的角度阐明板式聚结器强化油水分离过程的原理并为其设计提供依据,对油滴群在不锈钢斜板表面的聚结过程和油水两相在聚结板组内的分离过程进行了实验,研究分散相油滴在单一聚结板表面和聚结板组内的聚结行为及机理。结果表明:分散相油滴接触聚结板后将在表面形成凹凸不平的油滴层,而非连续流动的油膜;后续油滴通常难以直接融入油滴层,其中大油滴在油滴层表面主要以滚动方式离开聚结板,而小油滴则是通过嵌入凹凸不平的油滴层表面,并经过排挤水膜→聚并增长→形成随机流道→脱离聚结板的时间过程而实现分离。聚结板组对大油滴分离过程并无强化作用,但可有效强化小油滴分离过程。且强化原理主要在于3个方面:缩短油滴浮升至聚结面的时间;在板表面形成凹凸不平的油滴层,为小油滴提供稳定的停留场所以完成聚并过程;为分散相小油滴的聚并提供足够的聚结面积。这一机理较好阐明了小油滴分离实验结果及其分率效率随聚结器结构参数的变化规律,即一定范围内,增加聚结板长度(增加有效聚结面积)或减小板倾角(促进油滴停留与聚并)都将提高分离效率。
[Abstract]:In order to elucidate the principle of enhancing oil-water separation process by plate coalescence from the point of view of the mechanism of oil droplet coalescence in dispersed phase, and provide the basis for its design, The coalescence process of oil droplets on the surface of stainless steel inclined plate and the separation process of oil and water two phases in the agglomeration board were studied. The coalescence behavior and mechanism of the dispersed oil droplets on the surface of single agglomeration plate and the agglomeration board group were studied. The results show that the dispersed oil droplets will form an uneven oil droplet layer on the surface after contact with the agglomeration plate, instead of a continuous flow oil film, and the subsequent oil droplets are usually difficult to be directly integrated into the oil droplet layer. Large oil droplets on the surface of the oil droplet mainly leave the agglomeration plate in a rolling manner, while small oil droplets are embedded in the uneven surface of the oil droplet layer. And the separation is realized through the time process of extruding the water film and increasing the formation of random channel to separate from the agglomeration plate. The agglomeration plate group has no effect on the separation of large oil droplets, but it can effectively enhance the separation process of small oil droplets. The strengthening principle mainly lies in three aspects: shortening the time of oil droplet floating to the coalescence surface, forming an uneven oil droplet layer on the surface of the plate, providing a stable residence place for the small oil droplet to complete the coalescence process; Sufficient coalescence area is provided for the aggregation of small oil droplets in dispersed phase. The experimental results of the separation of small oil droplets and the variation of the fractionation efficiency with the structure parameters of the coalescers are well elucidated in this mechanism, that is, within a certain range, The separation efficiency can be improved by increasing the length of the coalescence plate (increasing the effective coalescence area) or decreasing the dip angle of the plate (promoting oil droplet retention and coalescence).
【作者单位】：四川大学化学工程学院;
【分类号】：TQ028.42

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