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Peng Y.,Lanzhou University of Technology | Peng Y.,Engineering Research Center for Waster Oil Recovery Technology and Equipment | Liu T.,Lanzhou University of Technology | Gong H.,Engineering Research Center for Waster Oil Recovery Technology and Equipment | And 2 more authors.
International Journal of Chemical Engineering | Year: 2016

The coalescence of droplets in oil can be implemented rapidly by high-voltage pulse electric field, which is an effective demulsification dehydration technological method. At present, it is widely believed that the main reason of pulse electric field promoting droplets coalescence is the dipole coalescence and oscillation coalescence in pulse electric field, and the optimal coalescence pulse electric field parameters exist. Around the above content, the dynamics of high-voltage pulse electric field promoting the coalescence of emulsified droplets is studied by researchers domestically and abroad. By review, the progress of high-voltage pulse electric field demulsification technology can get a better understanding, which has an effect of throwing a sprat to catch a whale on promoting the industrial application. © 2016 Ye Peng et al. Source


Gong H.-F.,Engineering Research Center for Waster Oil Recovery Technology and Equipment | Gong H.-F.,Chongqing University of Technology | Yang Z.-J.,Chongqing University of Technology | Peng Y.,Chongqing Steel and Iron Group. Co.
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2014

Under excitation of high pulse electric field, a drophappens to be in vibration during electro-dehydration of emulsified oil. So far, there are few references about theoretical calculation of drop vibration. A single vibrating drop in oil was regarded as a study object under high pulse electric field, and its dynamic model was built. By solving the model, drop vibration amplitude first approximate solution and its amplitude-frequency characteristic relation were obtained. Results of example calc and tests showed that the non-linear method of vibration calculation is reasonable and it can be used to predict drop's resonance frequency and amplitude. The study results were helpful to making highly efficient electro- dehydration machines. Source


Gong H.,Chongqing University of Technology | Gong H.,Engineering Research Center for Waster Oil Recovery Technology and Equipment | Peng Y.,Lanzhou University of Technology | Yang Z.,Chongqing University of Technology | And 2 more authors.
Colloids and Surfaces A: Physicochemical and Engineering Aspects | Year: 2015

Electro-demulsification is widely applied to the dehydration of emulsified oil. A droplet exposed to an electric field is polarised in oil and then stretched to a prolate sphere. The internal electric field distributions of prolate-sphere and spherical droplets are analysed in this work. The expressions of force acting on the droplets surface are obtained by establishing a model of stable droplet stretching deformation. An experiment is conducted to determine the draw ratio of water droplets subjected to a high electric field and exposed in four types of base oil. Comparison of the results of the experiment and model shows that the stable deformation of droplets is well predicted by the model. System parameters, such as electric field strength, droplet initial radius, interfacial tension of droplet - oil, permittivity and effect on the deformation of droplets, are also discussed. © 2015 Elsevier B.V. Source


Gong H.,Engineering Research Center for Waster Oil Recovery Technology and Equipment | Gong H.,Chongqing University of Technology | Peng Y.,Lanzhou University of Technology | Zhang X.,Engineering Research Center for Waster Oil Recovery Technology and Equipment | And 2 more authors.
Shiyou Xuebao, Shiyou Jiagong/Acta Petrolei Sinica (Petroleum Processing Section) | Year: 2014

The deformation and vibration of droplet in emulsion oil occurred under the action of high voltage pulse electric field, and the resilience of droplet vibration was provided by the oil-water interfacial tension, meaning that interfacial tension had an important effect to droplet vibration. By establishing the droplet vibration kinetics model, the simple approximate expression of droplet vibration amplitude was obtained, and then the effects of interfacial tension on droplet deformation and vibration could be analyzed. It was found by simulated numerical calculation results that the peak of droplet vibration amplitude increased with the decrease of interfacial tension, and within the scope of small interfacial tension an unstable droplet vibration occurred and could be improved by increasing the electric field frequency. In addition, the droplet resonance frequency increased with the increase of interfacial tension, so emulsion oil with larger interfacial tension had better demulsification effect under the action of high frequency electric field. The investigated results would be favor to the pulse electric field choice for efficient demulsification. ©, 2014, Science Press. All right reserved. Source


Gong H.,Chongqing University of Technology | Gong H.,Engineering Research Center for Waster Oil Recovery Technology and Equipment | Peng Y.,Lanzhou University of Technology | Shang H.,Chongqing University of Technology | And 2 more authors.
Chemical Engineering Science | Year: 2015

A drop of water subjected to a pulsed electric field in emulsified oil undergoes periodic stretching vibration, which is very effective for promoting the coalescence of the emulsified drops. In this study, the forces that act on a single water drop during its vibration in a pulsed electric field are analysed, and a dynamics model of the vibration of the drop is developed. The expression of the model indicates that the vibration can be described as a non-linear parametric excitation vibration, and comparison of the model predictions with experimental results reveals a good similarity. In addition, a first-order approximation of the predictions of the model is used to obtain the waveforms of the vibration, and the peak of the amplitude-frequency curve reveals the occurrence of resonance. This affords a basis for determining the optimal demulsification frequency of the emulsified oil in the pulsed electric field. © 2015 Elsevier Ltd. Source

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