| There is a lot of oil and water separation or demulsification technology in industry,but there are few techniques for the treatment and recovery of oil spill emulsion.The offshore oil spill treatment and recovery has the characteristics of external force disturbance,large flow and turbulent vertical mixing,which makes the general oil and water emulsion technology difficult to perform.Therefore,it is of great significance to study the method and technology of oil and water separation and crude oil recovery.The magnetic treatment technology has the advantages of strong effect stability and considerable economic benefit,which is conducive to the effective utilization of oil and gas resources and the depth treatment of oil and water dewatering in offshore oil and gas production.However,there is no clear and unified theory of the influence of magnetic field on the movement of droplet and the influence of magnetic field parameters on droplet movement.In this paper,the motion coalescence of droplet under magnetic field is studied by theoretical analysis,experimental study and numerical simulation.Firstly,the mechanical model of single droplet in oil is established,and the force is simplified and analyzed.Then,the kinetic equation of droplet is derived by theoretical analysis of the moving coalescence of two droplets in magnetic field.The experiment part introduces the experimental system,the experimental design and the experimental results.The magnetic field distribution of the electromagnet is analyzed,and the continuous phase is treated with the solution of water,and the surface tension of the droplet is measured,and the surface tension of the droplet can be reduced.In this paper,the change rule of the center spacing,the Angle of the vessel and the difference of the magnetic induction intensity are studied,and the operation parameter combination of the optimum oil and water separation is summarized.In addition,the SPH method is used to study the numerical simulation of droplet coalescence in magnetic field.The control equation of multiphase flow SPH model is derived,the surface tension model of CSF is introduced and verified,and the rationality of the model isproved.The morphology of droplet coalescence was analyzed by means of the model.The effects of magnetic induction intensity,initial center distance,droplet diameter and tilt Angle on motion coalescence of droplet were discussed.The results show that with the increase of magnetic induction intensity,the movement speed of the two droplets increases,and the magnetic induction intensity is positively correlated to the effect of coalescence.When the initial center spacing of the droplet is dr =0.003 m,the droplet moves more rapidly.With the increase of droplet diameter,the probability of coalescence is greater.Experimental sample tank tilted a certain Angle,droplet movement under the action of a gravity force and lorentz force for cutting the magnetic induction line and the electric field force,increased the droplet collision probability so as to promote the droplet coalescence.Droplet movement speed is accelerated,with the increase of Angle of magnetic induction strength increases to a certain value,the droplet coalescence rate no longer increases instead has a decreasing trend,is the best Angle and magnetic induction intensity,when the magnetic induction intensity B = 9.0×107T,tilt Angle of θ= 3 °,droplet velocity was the fastest.The research of this paper provides a basic theoretical basis for improving the separation performance of magnetic treatment oil and water,and the optimization of magnetic treatment of demulsification equipment and related processes. |
PDF Full Text Request