新型静电聚结分离器油-水分离特性

将同轴圆柱绝缘电极和传统重力式分离器整合,设计出了新型静电聚结分离器。基于Maxwell-Wagner模型,从电介质极化的角度分析了同轴圆柱绝缘电极的电场-频率分布特性;采用水-原油乳状液作为实验介质,利用显微高速摄像系统考察了电场强度、频率、乳状液含水率对新型静电聚结分离器聚结和分离效率的影响。结果表明,新型静电聚结分离器能够有效避免乳状液的二次乳化,并对不同流量、含水率的乳状液具有良好的适应性。交流电场作用下,绝缘电极在低频和高频时具有不同的电场分布特性,可以通过计算绝缘电极的极化弛豫时间获得高效聚结频率。乳状液含水率越高,最优电场强度和拐点频率越小,极板电压和频率是决定静电聚结分离器能耗的关键因素。

Oil-Water Separation Characteristics of New Type Electrostatic Coalescence Separator

Combining coaxial cylindrical insulated electrode with traditional gravity separator, the new type electrostatic coalescence separator was designed. Based on Maxwell-Wagner model, the electric field distribution characteristics of coaxial cylindrical insulated electrode system were investigated from dielectric polarization. With water-crude oil emulsion as experiment medium and micro high-speed camera system and image processing technology, the effects of electric field strength, frequency and water volume fraction on the coalescence of water droplets and oil-water separation of this new type electrostatic coalescence separator were investigated. The results showed that the new type electrostatic coalescence separator could effectively avoid re-emulsification and adapt to emulsions of different flow rates and water volume fractions. The insulated electrode had different electric field distribution characteristics under AC electric field of high and low frequency, and the optimal frequency could be gained through calculating the polarization relaxation time of insulated electrode. The optimal electric field intensity and inflexion point of high-efficiency frequency decreased with the increase of water volume fraction. Electrode voltage and frequency were the key determinants of energy consumption of the new type electrostatic coalescence separator.