Design And Parameter Optimization Of Three-field Synergy Demulsification Dehydration Device For Industrial Waste Oil

Lubricating oil is widely used in the fields of machinery,electricity,transportation and chemical industry and so on,it plays an important role in the national economy.Its physicochemical property will be reduced after long time repeated used,and then becomes industrial waste oil.The dewatering purification treatment for industrial waste oil is an extremely important part in the lubricating oil chain.In general,it is difficult for single process to accomplish the efficient demulsification and dehydration of waste oil.It is the mainstream of demulsification and dehydration of coupling integration two or more processes or units to complete the separation process,which is difficult to adapt for conventional process.In view of this,launching the design research and experiment of demulsification dehydration device for industrial waste oil uniting rotational flow centrifugal field,pulsed electric field and vacuum temperature field,which has important theoretical significance and engineering application value.Firstly,analyzed the stretching and deformation of droplet under the action of pulsed electric field based on the theory of electric fluid dynamics(EHD)from the perspective of the dielectric physics.Researched the deformation mechanism of the droplet in the pulsed electric field through analyzing the velocity field and the flow stress inside and beside the droplet.Verified the reliability of the theoretical modeling and calculation by simulating using COMSOL Multiphysics software and electric demulsification experiment.Secondly,simulated the dewatering effect of the cyclone using CFD software,selecting the Reynolds stress turbulence model,directed against the rotational flow centrifugal field demulsification dehydration unit.On the basis,coupled the pulsed electric field and the rotational flow centrifugal field by integrating the pulsed electric field into the vortex chamber section of the cyclone.Simulated the three dimensional flow field by COMSOL software to research the variation rule of total velocity and the components of the internal fluid in the the axial of coupling unit vortex chamber section,the large cone segment,the small cone segment and the underflow straight pipe section,under the conduction of different inlet flow rate,pulse electric field frequency and amplitude.And obtained the optimal parameter combination of the coupling unit.Finally,designed and manufactured the three-field synergy demulsification dehydration device,and carried out the demulsification dehydration experiment under the condition of multiple parameters.After the four-factor and five-level orthogonalexperiments,the optimal parameters combination would be obtained by means of range analysis of the orthogonal experiment results.Lunched the single factor experiments on the basis of the orthogonal experiments to study the influence rule of the inlet flow rate,the pulse electric field frequency,the pulse electric field amplitude and the heating temperature to the dehydration efficiency of the device.And determined the more precise parameters combination eventually.This study carried on the design and the related theoretical research on the the three-field synergy demulsification dehydration device for industrial waste oil by means of theoretical analysis,numerical simulation and experiment,and provided certain theoretical support to the engineering application of multi-field integration dehydration technology.