新型静电聚结器中水滴粒径的分布特性

传统电脱水器采用裸电极，乳化液含水率较高时高强电场作用下容易发生击穿现象，设计了包覆绝缘层的高压电极并加工了新型静电聚结器，采用水/原油乳状液为实验介质，并利用显微高速摄像系统结合图像处理技术，考察了电场强度，乳化液流量、含水率对液滴滴粒径分布特性的影响。结果表明，现场与室内实验的液滴粒径分布与Rosin-Rammler分布均吻合较好；包覆绝缘层的高压电极可有效防止电击穿现象的发生；增加电场强度有助于油、水分离，但高于临界电场强度后，容易导致液滴破碎，并且含水率越高，最优电场强度越低；随着乳化液流量的增加，电场作用降低，但高强电场在高流量下依然使液滴粒径明显增大。

Characteristics of Water Droplet Diameter Distribution in New Electrostatic Coalescer

Traditional electric dehydrator with bare electrodes is easily broken down by high voltage when the water content is high.The insulated electrode and new type of electrostatic coalescer were designed and made.The effects of electric field intensity,flow rate and water content of experiment medium on the water droplet diameter and its distribution under high AC electric field were investigated with water/crude oil emulsion as experiment medium.The micro high-speed camera system and image processing technology were used to analyze the droplet size in the entrance and outlet of electrostatic coalescer.The results indicated that the Rosin-Rammler distribution could satisfactorily predict the water droplet diameter distribution.The insulated high voltage electrode could effectively prevent electric breakdown.High electric field intensity was conductive to the coalescence of water droplets.If the electric field intensity is higher than the critical one,the water droplets will rupture.The optimal electric field intensities decreased with the increase of water content in experiment medium.With the increase of flow rate of experiment medium the effect of electric field intensity was weakened,and high electric field intensity could still effectively promote the coalescence of water droplets.