| 摘要: |
| 为了提高油包水乳状液在电脱水过程中的破乳效率,从静电聚结机理出发，推导出电极间距与电场强度的关 系式;通过分析液滴在极板间距狭小的矩形聚结管道中的受力状况，同时考虑绝缘层以及层流流态对电场中液滴聚 结作用的影响,设计出一种绝缘紧凑型电破乳器。改变所加电压和流量以调节破乳器中的电场强度和乳状液停留 时间,利用激光粒度仪测量乳化物中水滴的体积平均直径。结果表明，缩小电极间距能产生髙强电场;包覆绝缘层 的电极板在小间距下能有效破乳并防止击穿，且电场强度越大停留时间越长，聚结效果越显著。该装置可提高油包 水乳状液的聚结效率并节省大量空间。 |
| 关键词: 电破乳 静电聚结 绝缘 电场 粒度 |
| DOI： |
| 分类号: |
| 基金项目:国家“863”项目(2006AA092302) |
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| Coalescence characteristics of droplets in insulated compact electric demulsifier |
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ZHANG Li-ming, HE Li-min, MA Hua-wei, Lv Yu-ling, LIU Qing
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(College of Transport & Storage and Civil Engineering in China University of Petroleum, Dongying 257061,Shandong Province, China )
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| Abstract: |
| In order to increase the demulsifying efficiency of water-in-oil emulsion,a new compact electrostatic coalescer was designed by analyzing the force summing condition of the droplets in the rectangle coalescing pipe and considering the effect of the insulate coat and laminar flow pattern on the coalescing process of droplets in electric field. Tlie electric field intensity and residence time can be regulated by changing the applying voltage and flow rate. The volume mean diameter of droplets were measured by particle and droplet size analyzer. The data of the experiments indicate that the electric field intensity can be enhanced by decreasing the distance between the electrodes, and the electrode plates with insulate coat can effectively demulsify the emulsion and avoid puncturing when the distance between the plates are relatively small. The results show that a longer residence time and a stronger electric field intensity can result in enhanced coalescing efficiency of the droplets. The compact electrostatic coalescer can improve the coalescing efficiency of water-in-oil emulsion and reduce space substantially. |
| Key words: electrical demulsification electrostatic coalescence insulated electric field particle size |
