Parameter Optimization Design Of Double-field Union Demulsification Device For Emulsified Lubricating Oil

Lubricating oil is easily polluted by water in the process of production,transportation,storage,filling and use,and then becomes emulsified oil.It's difficult for traditional single demulsification and dehydration method to accomplish the efficient and rapid demulsification and dehydration of emulsified oil.In view of this,the demulsification and dehydration will be proceeded by uniting high-voltage pulse electric field and rotational flow centrifugal field.That is to say,the small emulsified droplets,subjected to high-voltage pulse electric field,are coalesced rapidly into bigger droplets,and then the big droplets will be seperated and settled speedly in the rotational flow centrifugal field.Therefore,the efficiency and speed of demulsification and dehydration of emulsified oil will be improved greatly on the whole.Based on the basic thought above,this paper successively proceeds studies of pulse electric field demulsification,rotational flow centrifugal field dehydration and double-field union demulsification dehydration experiment.In the study of pulse electric field demulsification,firstly,the vibration dynamic model of droplet in oil is established by force analysis.Secondly,by the numerical solution of model,the optimal demulsification electric field intensity and frequency are obtained,namely E=1016 k V/m and f=460 Hz.Finally,through the experiment of pulse electric field demulsification,the influence rule of electric field parameters to coalescence of droplets is analyzed,and the best demulsification electric field parameters are obtained,namely E=1000k V/m and f=450 Hz,which well verifies the validity and reliability of theoretical calculation.In the research of rotational flow centrifugal field dehydration,firstly,the structure parameters of hydrocyclone are optimized simulated by software FLUENT,at the same time,the influence rule of structure parameters to separation efficiency is analyzed,and the optimal structure size of hydrocyclone is obtained and its dewatering rate and deoiling rate are 93.1% and 68.2% separately.Secondly,the operating parameters are optimized simulated,at the same time,the influence rule of operating parameters to separation efficiency is analyzed,and the optimal operating parameters which are suitable for this structure are obtained.The optimal operating parameters are same to the initial operating parameters,which indicates that the optimal structure parameters have a good correspondence with the optimal operating parameters.Finally,the experiment of oil-water separation with hydrocyclone is conducted and the optimal dewatering rate and deoiling rate are 89% and 65% separately.The experimental results,slightly lower than the simulation results,well verify the reliability and validity of simulation results.The experimental device of double-field union demulsification dehydration is designed and setted up.Through a series of demulsification dehydration experiments,the optimal electric field parameters are obtained,namely E=1100k V/m and f=500 Hz,which further validates the rationality and validity of theoretical model.The corresponding optimal dewatering rate and deoiling rate are 88.2% and 63.8% separately,while under the effect of single rotational flow centrifugal field,the dewatering rate and deoiling rate are 41.6%and 25.3% separately.Obviously,the double-field union has a greater superiority in term of oil-water separation.The double-field union demulsification dehydration device is rapid and efficient in dealing with low aqueous emulsified lubricating oil,which has an important practical significance and broad application prospects for the purification and regeneration of lubricating oil.