絮团形态学特征对絮团与气泡碰撞、吸附的影响
发布时间：2018-07-18 09:41
【摘要】：为了研究絮团的形态对絮团与气泡碰撞及吸附的影响,设计了图像分析系统,拍摄了絮团与气泡接触过程中的视频文件并从中提取含有絮团位置及形态特征的静态帧。使用Image Pro Plus 6.0根据絮团的粒径对絮团进行了粒度级的划分,使用统计学的方法,对每个粒度级的絮团与气泡的碰撞及吸附效率进行了分析及计算,发现碰撞效率随絮团粒径的增加而增长,吸附效率先随着粒径的增加而增长但是在絮团粒径为200μm左右时出现转折,开始下降。利用Matlab位置提取程序对絮团运动过程中位置信息进行获取,根据Stokes沉降原理,计算絮团密度,发现絮团的密度随着粒径的规律性变化,在粒径为170μm时密度最大。认为絮团粒径对碰撞效率起主导作用,絮团密度对吸附效率起主导作用。此外,通过观测絮团与气泡接触过程发现,结构密实的絮团自与气泡发生接触后接触点恒定,而结构疏松的絮团与气泡接触后普遍存在旋转的现象,接触点的变化,导致结构疏松的絮团极易从气泡上脱落,吸附效率低。
[Abstract]:In order to study the effect of flocs shape on the collision and adsorption between flocs and bubbles, an image analysis system was designed. The video files in the process of contact between flocs and bubbles were photographed and the static frames containing the position and morphological characteristics of flocs were extracted. According to the particle size of flocs, the particle size of flocs is divided by Image Pro Plus 6.0, and the collision and adsorption efficiency between each floc and bubble are analyzed and calculated by statistical method. It is found that the collision efficiency increases with the increase of the particle size of the flocs, and the adsorption efficiency increases with the increase of the particle size at first, but turns when the particle size of the flocs is about 200 渭 m and begins to decrease. The position information of flocs in the course of floc motion was obtained by Matlab position extraction program. According to Stokes settlement principle, the density of flocs was calculated. It was found that the density of flocs changed regularly with the particle size, and the maximum density was obtained when the particle size was 170 渭 m. It is considered that the particle size of the flocs plays a leading role in the collision efficiency and the flocs density plays a leading role in the adsorption efficiency. In addition, by observing the contact process between the floc and the bubble, it is found that the contact point of the flocs with dense structure is constant since it comes into contact with the bubble, while the phenomenon of rotation and the change of the contact point exist generally after the contact between the floc and the bubble is loose. The floc, which leads to loose structure, is easy to fall off the bubble, and the adsorption efficiency is low.
【作者单位】： 中国矿业大学(北京)化学与环境工程学院;
【基金】：国家自然科学基金资助项目(51474211)
【分类号】：TD94;TD923
本文编号：2131511
[Abstract]:In order to study the effect of flocs shape on the collision and adsorption between flocs and bubbles, an image analysis system was designed. The video files in the process of contact between flocs and bubbles were photographed and the static frames containing the position and morphological characteristics of flocs were extracted. According to the particle size of flocs, the particle size of flocs is divided by Image Pro Plus 6.0, and the collision and adsorption efficiency between each floc and bubble are analyzed and calculated by statistical method. It is found that the collision efficiency increases with the increase of the particle size of the flocs, and the adsorption efficiency increases with the increase of the particle size at first, but turns when the particle size of the flocs is about 200 渭 m and begins to decrease. The position information of flocs in the course of floc motion was obtained by Matlab position extraction program. According to Stokes settlement principle, the density of flocs was calculated. It was found that the density of flocs changed regularly with the particle size, and the maximum density was obtained when the particle size was 170 渭 m. It is considered that the particle size of the flocs plays a leading role in the collision efficiency and the flocs density plays a leading role in the adsorption efficiency. In addition, by observing the contact process between the floc and the bubble, it is found that the contact point of the flocs with dense structure is constant since it comes into contact with the bubble, while the phenomenon of rotation and the change of the contact point exist generally after the contact between the floc and the bubble is loose. The floc, which leads to loose structure, is easy to fall off the bubble, and the adsorption efficiency is low.
【作者单位】： 中国矿业大学(北京)化学与环境工程学院;
【基金】：国家自然科学基金资助项目(51474211)
【分类号】：TD94;TD923
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