新型静电聚结器中水滴粒径的分布特性.pdf

石油学报(石油加工
2012年6月
ACTA PETROLEI SINICA (PETROLEUM PROCESSING SE
第28卷第3期
文章编号:1001-8719(2012)03-0505-07
新型静电聚结器中水滴粒径的分布特性
杨东海,何利民,罗小明,昌宇玲
(中国石油大学储运与建筑工程学院,山东青岛266555)
摘要:传统电脱水器采用棵电极、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、含水率对液滴粒径分布特性的影响。结果表明,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。
关键词:液滴;电聚结器;分布;电场强度;含水率
中图分类号:TE624.1文献标识码:Adoi:10.3969/j,issn.1001-8719.2012.03.025
Characteristics of Water Droplet Diameter Distribution in New Electrostatic Coalescer
YANG Donghai, HE Limin, LUO Xiaoming, LU Yuling
(College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao 266555, China)
Abstract 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 o
electric field intensity was weakened, and high electric field intensity could still effectively promote
the coalescence of watcr droplets
Key words: droplet; electrostatic coalecer; distribution; electric field intensity; water content
原油采出液中含有大量乳化水,经过一次沉降分离方法,其优点是能耗低、分离效率高们。但目
后,原油中仍然含有大量的微水滴。采用高强电场前传统电脱水器大多采用裸电极,如果原油中的含
促进油包水乳化物中的水滴聚结是一种常用的物理水率高于20%(体积分数,下同),则可能引起电极
收稿日期:2011-04-11
基金项目:国家自然科学基金(51006124,51106182)、中央高校基本科研业务费专项资金(09CX04032A)和研究生创新基金(CXZD11-13)资助
第一作者:杨东海,男,博士,从事油水分离的实验研究
通讯联系人:何利民,男,教授,博上,从事油气集输及多相流分离方面的研究;Tel:0532-86981818;E-mail:helimin@mail.upc.edu.cn