电场对乳化废油双场耦合分离影响的数值分析
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摘要
由于单一工艺手段难以有效地完成高含水废油的破乳脱水处理,以脱水型水力旋流器为单元本体,嵌入高压电极,可高效实现废油乳化液的高压电场和旋流离心场耦合破乳脱水处理。通过建立双场耦合分离数值分析模型,结合流体控制方程,借助用户自定义函数法,计算分析了电场条件对旋流离心场中油-水混合液速度场分布及分离效率的影响。数值结果表明,高压电场嵌入脱水型水力旋流器对双场耦合单元内部流场分布影响较小,其中切向速度有较小增加,有利于乳化液的油-水分离,而轴向速度无明显变化;然而,高压电场对油-水分离效率有明显地促进作用,溢流口脱水率及底流口脱油率分别提高了12.45%和22.20%。废油乳化液双场耦合破乳脱水处理要优于单一场处理方法。
It is a challenge with a single process to efficiently complete demulsification and dewatering of waste oil with high water volume content.With hydro-cyclone as the body structure while embedded with high voltage electrode,it can effectively achieve the demulsification and dewatering of waste oil by coupling high voltage electrical field with whirl centrifuge fields(please double check with this terminology).With double-field coupling numerical model,while combined with the fluid flow control equations and user-defined function,effects of electric field conditions on oil-water mixture velocity distribution in the swirl centrifugal field and separation efficiency were analyzed.Numerical simulation results indicated that effect of high voltage electric field embedded in the hydro-cyclone on the internal flow field of the double-field coupling unit was very minor.The simulation results also suggested there was a slight increase for tangential velocity,which is good for oil water separation in emulsions;however,the axial velocity did not have a significant change.Especially,high voltage electric field can significantly enhance separation efficiency of oil and water,leading to overflow port dewatering ratio and outflow port de-oil ratio improved 12.45%and 22.20%,respectively.Therefore,for waste oil demulsification and dewatering,double-field coupling method is better than single field treatment.
It is a challenge with a single process to efficiently complete demulsification and dewatering of waste oil with high water volume content.With hydro-cyclone as the body structure while embedded with high voltage electrode,it can effectively achieve the demulsification and dewatering of waste oil by coupling high voltage electrical field with whirl centrifuge fields(please double check with this terminology).With double-field coupling numerical model,while combined with the fluid flow control equations and user-defined function,effects of electric field conditions on oil-water mixture velocity distribution in the swirl centrifugal field and separation efficiency were analyzed.Numerical simulation results indicated that effect of high voltage electric field embedded in the hydro-cyclone on the internal flow field of the double-field coupling unit was very minor.The simulation results also suggested there was a slight increase for tangential velocity,which is good for oil water separation in emulsions;however,the axial velocity did not have a significant change.Especially,high voltage electric field can significantly enhance separation efficiency of oil and water,leading to overflow port dewatering ratio and outflow port de-oil ratio improved 12.45%and 22.20%,respectively.Therefore,for waste oil demulsification and dewatering,double-field coupling method is better than single field treatment.
引文
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[17]ATTEN P.Electro-coalescence of water droplets in an insulating liquid[J].J Electrostatics,1993,30:259-270.
[18]GAO S L,WEI D Z,LIU W G,et al.CFD numerical simulation of flow velocity characteristics of hydrocyclone[J].Transactions of Nonferrous Metals Society of China,2011,21(12):2783-2789.
[2]SU S L,LIEW R K,JUSOH A,et al.Progress in waste oil to sustainable energy,with emphasis on pyrolysis techniques[J].Renewable&Sustainable Energy Reviews,2016,53:741-753.
[3]黄燚,钟成华,张文东,等.废润滑油组合技术研究现状及展望[J].现代化工,2015(7):19-22.(HUANGYan,ZHONG Chenghua,ZHANG Wendong,et al.Research status and prospects of waste lubricating oil combined technology[J].Modern Chemical Industry,2015,35(7):19-22.)
[4]RINCON J,CANIZARES P.Regeneration of used lubricant oil by polar solvent extract-ion[J].Ind Eng Chem Res,2005,44:4373-4379.
[5]顾国疆,刘阁,陈彬,等.W/O型乳化液物理破乳技术及装置研究进展[J].化工进展,2015,34(2):319-324.(GU Guojiang,LIU Ge,CHEN Bin,et al.Research progress of physical demulsification technologies and equipment about W/O emulsions[J].Chemical Industry and Engineering Progress,2015,34(2):319-324.)
[6]龚海峰,张贤明,彭烨,等.废油三场耦合破乳脱水工艺与装置[J].现代化工,2016,36(1):164-167.(GONG Haifeng,ZHANG Xianming,PENG Ye,et al.Three-field coupled procedure and equipment for demulsification and dehydration of waste oil[J].Modern Chemical Industry,2016,36(1):164-167.)
[7]潘诗浪,张贤明,吴峰平.W/O乳化液破乳方法及机理研究[J].重庆工商大学学报(自然科学版),2010,27(2):158-163.(PAN Shilang,ZHANG Xianming,WUFengping.The study of demulsification in oil water emulsion[J].Journal of Chongqing Technology and Business University Social Science Edition,2010,27(2):158-163.)
[8]BAILES P J,DOWLING P D.The production of pulsed E.H.T voltages for electrostatic coalescence[J].Journal Electrostatics,1985,17(3):321-328.)
[9]阎军,毛宗强,何向明.静电场和离心场联合分离水/油型乳状液[J].化工学报,1998,49(1):17-27.(YANJun,MAO Zongqiang,HE Xiangming.W/O emulsion separated under the combination of centrifugal field and pulsed electric field[J].CIESC Journal,1998,49(1):17-27.)
[10]陈海燕,漆新民.高压原油脉冲电脱水实验[J].油气田地面工程,2000,19(1):28,37.(CHEN Haiyan,QI Xinming.Pulsed electric dewatering test of high pressure crude oil[J].Oil-Gas Field Surface Engineering,2000,19(1):28,37.)
[11]杨秀丽.离心-脉冲电场作用下W/O乳状液液滴的动力学研究[D].青岛:中国石油大学(华东),2009.
[12]王健.高压脉冲电场与离心场联合作用下乳状液聚结规律实验研究[D].青岛:中国石油大学(华东),2009.
[13]孙立江.高频脉冲-离心场作用下乳状液聚结沉降规律的研究[D].青岛:中国石油大学(华东),2008.
[14]PENG Y,LIU T,GONG H,et al.Dehydration of emulsified lubricating oil by three fields:Swirl centrifugal field,pulse electric field and vacuum temperature field[J].Applied Petrochemical Research,2016,6(4):389-395.
[15]黄晓琴.麦克斯韦应力张量方法及其应用[J].南京师大学报(自然科学版),1995,14(1):41-43.(HUANGXiaoqin.The method of Maxwell stress tensor and its application[J].Journal of Nanjing Normal University(Engineering and Technology Education),1995,14(1):41-43.)
[16]MURTHY Y R,BHASKAR K U.Parametric CFDstudies on hydrocyclone[J].Powder Technology,2012,230:36-47.
[17]ATTEN P.Electro-coalescence of water droplets in an insulating liquid[J].J Electrostatics,1993,30:259-270.
[18]GAO S L,WEI D Z,LIU W G,et al.CFD numerical simulation of flow velocity characteristics of hydrocyclone[J].Transactions of Nonferrous Metals Society of China,2011,21(12):2783-2789.
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