【摘要】：為了研究絮團(tuán)的形態(tài)對絮團(tuán)與氣泡碰撞及吸附的影響,設(shè)計了圖像分析系統(tǒng),拍攝了絮團(tuán)與氣泡接觸過程中的視頻文件并從中提取含有絮團(tuán)位置及形態(tài)特征的靜態(tài)幀。使用Image Pro Plus 6.0根據(jù)絮團(tuán)的粒徑對絮團(tuán)進(jìn)行了粒度級的劃分,使用統(tǒng)計學(xué)的方法,對每個粒度級的絮團(tuán)與氣泡的碰撞及吸附效率進(jìn)行了分析及計算,發(fā)現(xiàn)碰撞效率隨絮團(tuán)粒徑的增加而增長,吸附效率先隨著粒徑的增加而增長但是在絮團(tuán)粒徑為200μm左右時出現(xiàn)轉(zhuǎn)折,開始下降。利用Matlab位置提取程序?qū)π鯃F(tuán)運(yùn)動過程中位置信息進(jìn)行獲取,根據(jù)Stokes沉降原理,計算絮團(tuán)密度,發(fā)現(xiàn)絮團(tuán)的密度隨著粒徑的規(guī)律性變化,在粒徑為170μm時密度最大。認(rèn)為絮團(tuán)粒徑對碰撞效率起主導(dǎo)作用,絮團(tuán)密度對吸附效率起主導(dǎo)作用。此外,通過觀測絮團(tuán)與氣泡接觸過程發(fā)現(xiàn),結(jié)構(gòu)密實的絮團(tuán)自與氣泡發(fā)生接觸后接觸點恒定,而結(jié)構(gòu)疏松的絮團(tuán)與氣泡接觸后普遍存在旋轉(zhuǎn)的現(xiàn)象,接觸點的變化,導(dǎo)致結(jié)構(gòu)疏松的絮團(tuán)極易從氣泡上脫落,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.
【作者單位】： 中國礦業(yè)大學(xué)(北京)化學(xué)與環(huán)境工程學(xué)院;
【基金】：國家自然科學(xué)基金資助項目(51474211)
【分類號】：TD94;TD923

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