期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 227, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.seppur.2019.115737
关键词
Oil-water separation; Droplet-interface coalescence; Critical electric field strength; Hydrolyzed polyacrylamide; Electric waveform; Frequency
资金
- National Natural Science Foundation of China [51704318, 51674281]
- Natural Science Foundation of Shandong Province, China [ZR2017BEE008]
- Fundamental Research Funds for the Central Universities of China [19CX02033A]
- Introduction of Talent Research Start-up Fund [YJ201601016]
- Scientific and Technology Planning Project of Gansu Province of China [18YF1GA006]
Polymer flooding is widely used in petroleum industry to enhance oil recovery. However, presence of polymer molecules in produced liquids can influence the droplet coalescence at oil-water interface in electric dehydration separators. In this study, the influence of hydrolyzed polyacrylamide (HPAM) on droplet-interface coalescence was examined through high-speed recording and observation. Deformation of droplets of aqueous polymer solution under electric fields was experimentally observed. The images showed droplets collapsed to filament without pinch-off due to viscoelasticity. Meanwhile, fine secondary droplets erupted from the summit of filament, which was detrimental to dehydration efficiency. A critical electric field strength (E-crit) beyond which partial coalescence occurred was identified. The effects of the initial droplet size, HPAM concentration, electric field waveform and frequency were explored. The results showed that E-crit increased with the decrease in initial droplet radius or the increase in HPAM concentration. Four kinds of AC or pulsatile electric fields (PEFs) were used including sinusoidal AC (sine AC), square, pulsed DC (PUDC) and pulsed AC (PUAC) waveforms. The increase in frequency suppressed the electro-induced stretching of droplets in the vertical direction, inhibiting partial coalescence. For these different electric fields, the increase in E-crit with elevated frequencies followed different ways. Overall, E-crit of square waveform was larger than those of other waveforms; however, E-crit of PUAC and sine AC waveforms may exceed that of square waveform at high frequencies. These findings are useful for the development of electro-dehydration separators for oils containing dissolved polymers in the dispersed aqueous phase.
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