Journal of Petrochemical Universities

Journal of Petrochemical Universities ›› 2010, Vol. 23 ›› Issue (2): 53-57.

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Investigation on the Separation Characteristics of W/O Emulsion in the Cylinder-Electrode Coalescer

  

  1. School of Transport & Storage and Civil Engineering, China University of Petroleum, Qingdao Shandong 266555, P.  R. China
  • Received:2010-04-08 Published:2010-06-25 Online:2010-06-25

油包水乳状液在圆柱电极聚结器中的分离特性研究

吕宇玲,何利民,罗小明,何兆洋   

  1. 中国石油大学(华东)储运与建筑工程学院, 山东青岛266555
  • 作者简介:吕宇玲(1971 -), 女, 山东东营市, 副教授, 博士研究生
  • 基金资助:
    国家科技重大专项资助课题子课题(2008ZX05026 -004-05)

Abstract:

A new type of cylinder-electrode electrostatic coalescer with insulation was designed and developed. When the W/O emulsion flowed through the electrodes, under the applied electrical field, the tiny water droplets coalesced into bigger droplets and then settled out to separate. With the laboratory experiments, W/O emulsion separation characteristics was investigated. The relationship among the electrode diameter and length, electrical field intensity and water cut was investigated. Also the influence of these parameters was analyzed. It is shown that, without the electrodispersion happening, the coalescer separation efficiency of water-in-oil emulsion increases as the electric field intensity increases. Also the separation efficiency is influenced by the affecting time of electric field and the electrostatic force between the droplets in the water-in-oil emulsion. When the water content is low, the influence of electric field affecting time plays an important role and it’s proved that the longer the electric field affecting time, the higher the separation efficiency. Under the condition of high water content, the influence of electric field affecting time decreases. When the electrostatic force between the droplets in the water-in-oil emulsion increases, the separation efficiency also turns higher. The high-speed camera was used to observe and record the droplets’ size from the coalescer exit. It’s estimated that the droplets’ size increased dramatically. Accordingly, the new cylinder-electrode electrostatic coalescer showed high efficiency in the separation of diesel oil/water emulsion.

Key words:

摘要: 设计制作了一种带有绝缘层的圆柱电极静电聚结器, 油包水乳状液流过电极, 在电场力的作用下水
滴聚结, 经重力沉降达到油水分离的目的。通过室内实验, 分析了油包水乳状液在这种电极作用下的油水分离特
性, 研究了圆柱电极的直径、长度和电场强度、含水率等因素对分离效率的影响。研究表明, 在不发生电分散情况
下, 电场强度越大, 油水乳状液在聚结器中的分离效率也越高;分离效率受电极作用时间和液滴间静电力的共同影
响, 在含水较低时, 油包水乳状液中液滴间静电力小, 电极作用时间的影响起主导作用, 电极停留时间越长, 分离效
率越高;含水率升高, 油包水乳状液中液滴间静电力增大, 电极作用时间的影响作用减小, 液滴间的静电力影响作用
增大, 液滴间静电力越大, 分离效率越高。利用高速微观摄像系统拍摄并观察到聚结器出口液滴粒径比进口粒径明
显增大, 即圆柱电极静电聚结器对柴油-水乳状液具有良好的聚结效果

关键词: 油水乳状液 , 聚结器 , 圆柱电极 , 分离效率

Cite this article

Lv Yu-ling, HE Li-min, LUO Xiao-ming, HE Zhao-yang. Investigation on the Separation Characteristics of W/O Emulsion in the Cylinder-Electrode Coalescer[J]. Journal of Petrochemical Universities, 2010, 23(2): 53-57.

吕宇玲,何利民,罗小明,何兆洋. 油包水乳状液在圆柱电极聚结器中的分离特性研究[J]. 石油化工高等学校学报, 2010, 23(2): 53-57.

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