直流电场作用下微米级液滴碰撞聚结研究  

Collision coalescence of micron droplets research underdirect current electric field

作　　者：李青 聂剑红 於宏伟 焦体峰[2] LI Qing;NIE Jianhong;YU Hongwei;JIAO Tifeng(Hebei Key Laboratory of Safety Monitoring of Mining Equipment,North China University of Science and Technology,Langfang,Hebei 065201,China;Hebei Key Laboratory of Applied Chemistry,Yanshan University,Qinhuangdao,Hebei 066004,China)

机构地区：[1]华北科技学院河北省矿山设备安全监测重点实验室,河北廊坊065201 [2]燕山大学河北省应用化学重点实验室,河北秦皇岛066004

出　　处：《燕山大学学报》2024年第2期181-188,共8页Journal of Yanshan University

基　　金：中央高校基本科研业务费项目(3142020017);河北省教育厅科学技术研究项目(ZC2023124);河北省中央引导地方科技发展资金项目(236Z1206G);国家自然科学基金资助项目(22072127)。

摘　　要：润滑油在工业中的有着重要作用,但其中的水分会影响设备性能和使用寿命。传统的水分去除方法效率低、成本高。静电脱水技术可以通过电场作用将水润滑油中从分离出,利用电场促进油水液滴的碰撞和凝聚,具有快速、高效、环保等优点。本论文利用COMSOL软件对油包水乳液中两个液滴的碰撞聚集进行数值模拟,研究微米级液滴直流电场作用下电场强度、温度、粒径、和液滴间距等因素对碰撞和聚结行为的影响规律,研究表明随着电场强度增大,液滴聚结时间快速变小,但电场强度超过一定值时影响减弱;随着温度的升高,液滴聚结时间先急剧减少,到一定值后基本趋于稳定;随着粒径增大,液滴聚并总时间随液滴直径先缓慢增加,当粒径超过一定值时急聚增加;随着液滴间距增大,聚结总时间不断增大,本文为静电脱水的机理研究提供理论依据,为高效破乳脱水装置的设计提供技术支撑。Lubricating oil plays an important role in industry,but the moisture in it will affect the performance and service life of the equipment.Traditional water removal methods have low efficiency and high cost.The electrostatic dehydration technology can separate the lubricating oil from the water through the action of electric field,and use the electric field to promote the collision and condensation of oil and water droplets,which has the advantages of fast,high efficiency and environmental protection.In this paper,COMSOL software was used to numerically simulate the collision aggregation of two droplets in waterinoil emulsion,and the influence of such factors as electric field strength,temperature,particle size and droplet spacing on the collision and coalescence behavior of micronlevel droplets under the action of direct current electric field was studied.The research showed that droplet coalescence time decreased rapidly with the increase of electric field strength.However,when the electric field intensity exceeds a certain value,the effect is weakened.With the increase of temperature,the droplet coalescence time decreases sharply at first,and then becomes stable after reaching a certain value.With the increase of particle size,the total time of droplet agglomeration increases slowly with the droplet diameter,and the rapid agglomeration increases when the particle size exceeds a certain value.With the increase of droplet spacing,the total coalescence time increases continuously.This paper provides theoretical basis for the study of electrostatic dehydration mechanism and technical support for the design of efficient demulsification dewatering device.

关 键 词：电破乳 液滴聚结 直流电场 数值模拟 

分 类 号：TE992[石油与天然气工程—石油机械设备]