泡沫分离过程中泡沫层总高度对持液率的影响  

Effects of Total Foam Height on the Liquid Holdup in the Foam Fractionation Process

作　　者：钱少瑜[1] 李雪良[1] 吴兆亮[1] 刘萌[1] 

机构地区：[1]河北工业大学生物工程系,天津300130

出　　处：《高校化学工程学报》2009年第3期543-546,共4页Journal of Chemical Engineering of Chinese Universities

基　　金：天津市应用基础及前沿技术研究计划重点资助项目(08JCZDJC25200);河北省教育厅自然科学研究计划(Z2008310)

摘　　要：以乳链菌肽发酵液为模拟体系,研究了泡沫分离过程中泡沫层总高度对泡沫塔出口持液率εout以及泡沫层轴向持液率分布特性的影响。实验发现:在泡沫层形成过程中,εout从一个较低值逐渐升高到一个较高的稳定值;泡沫在塔内泡沫相中的停留时间不是εout的决定性因素,气速对εout的影响很大。同时还发现:随着泡沫层总高度的增加,εout缓慢下降而泡沫层与液层界面处的持液率急剧上升,可以推测出整个轴向持液率特性分布会上移。实验数据表明仅仅用静态泡沫的排液时间代替上升动态泡沫的停留时间的方法来预测εout的一般方法可能得出错误的结果。Using nisin fermentation broth as the model solution, the foam fractionation was conducted, and the influence of the total foam height （HF） on the average liquid fraction of the foam leaving the column （εout） and the axial liquid holdup profile of the foam along the foam height was investigated. It was found that, during the formation of the foam layer, eout increases gradually from a relatively low value to a higher constant value, and the resident time of the foam in the foaming phase isn＇t the decisive factor of Sour, while the superficial gas velocity has an important influence on eout. It was also found that, as the total foam height increases, the liquid fraction of the foam at the foam/liquid interface increases sharply, while only slight decrease in εout was observed; therefore a shift-up of the axial liquid holdup profile of the foam could be expected. The experimental data indicate that the common approach of predicting Cout by simply using the drainage time of a static standing foam instead of the column resident time of the rising dynamic foam may produce wrong results.

关 键 词：泡沫分离 鼓泡塔 持液率 泡沫排液 

分 类 号：TQ028.9[化学工程]