| 电场作用下双液滴聚合特性 |
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| 引用本文： | 宋粉红,王伟,陈奇成,范晶. 电场作用下双液滴聚合特性[J]. 化工学报, 2021, 72(Z1): 371-381. DOI: 10.11949/0438-1157.20201130 |
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| 作者姓名： | 宋粉红 王伟 陈奇成 范晶 |
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| 作者单位： | 1.东北电力大学能源与动力工程学院，吉林省 吉林市 132012;2.松花江水力发电有限公司吉林丰满发电厂，吉林省 吉林市 132000 |
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| 基金项目： | 国家自然科学基金项目(51606032);吉林省自然科学青年基金项目(20190103065JH);吉林市杰出青年基金项目(20190104133) |
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| 摘 要： | 乳状液破乳分离是目前高含水期油田开采过程中难以解决的技术问题，电场破乳方法具有高效清洁等优点，是解决该问题的有效手段。采用数值模拟与试验验证相结合的方法研究电脱水过程中阶跃、斜坡电场诱导下双液滴的聚合与分离特性。结果表明，在斜坡电场作用下，界面张力引起的泵吸作用大于电场力引起的颈缩作用，有利于液滴聚并，且液滴发生二次乳化现象的概率降低。而施加阶跃电场时，一定范围内能够达到液滴破乳的目的，但液滴在聚并过程中易发生二次乳化现象。从电场对连续相影响的角度分析发现，阶跃电场不仅对液滴具有驱动作用，对连续相的影响也较为明显，阶跃电场会增大连续相内湍流作用，不利于电脱水过程。因此，采用斜坡信号诱导液滴聚合能够降低二次乳化现象发生的概率。
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| 关 键 词： | 液滴 相场方法 电脱水 聚结 分离 数值模拟 |
| 收稿时间： | 2020-08-10 |
Coalescence characteristics of the double droplets under electric field |
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| SONG Fenhong,WANG Wei,CHEN Qicheng,FAN Jing. Coalescence characteristics of the double droplets under electric field[J]. Journal of Chemical Industry and Engineering(China), 2021, 72(Z1): 371-381. DOI: 10.11949/0438-1157.20201130 |
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| Authors: | SONG Fenhong WANG Wei CHEN Qicheng FAN Jing |
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| Affiliation: | 1.College of Energy and Power Engineering, Northeast Electric Power University, Jilin 132012, Jilin, China;2.Jilin Fengman Power Plant of Songhua River Hydropower Co. Ltd. , Jilin 132012, Jilin, China |
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| Abstract: | Demulsification of emulsion is a difficult technical problem to be solved in the process of oilfield production in high water cut period. Electric field demulsification is an effective ways to solve this problem because of its advantages of clean and high efficiency. In this paper, numerical simulation and experimental verification were applied to study the coalescence and separation characteristics of double droplets induced by the step and ramp signal electric field in the process of electric dehydration. The results show that under the action of ramp signal electric field, the pumping suction effect caused by interfacial tension is far greater than the necking effect caused by electric field, which is conducive to the coalescence of droplets, and reduces the probability of secondary emulsification of droplets. While applying the step signal electric field, the demulsification of the droplet can be achieved within a certain range, but the droplet is prone to secondary emulsification during coalescence. From the perspective of the effect of electric field on the continuous phase, it is found that the step signal electric field not only drives the droplet deformation and coalescence, but also has an obvious effect on the continuous phase. The step signal electric field increases the turbulence effect in the continuous phase, which is unfavorable to the electric dehydration process. Therefore, applying ramp signal to induce droplet coalescence could reduce the probability of secondary emulsification in the electric dehydration process. |
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| Keywords: | droplet phase field method electric dehydration coalescence separation numerical simulation |
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