The Research Of Relationship Between Oil-water Separation Performance And Fiber Combinations

Many problems are caused by the water mixed with oil in petrochemical industry,such as disqualification of product,the increase of energy consumption and potential safety hazard.Coalescence separation technique has caused wide public concern in the field of liquid-liquid separation for the characteristics of short separation time,high separation efficient and low energy consumption.On the basis of modified Stokes formula with the rheological coefficient,this paper measured the particle size distribution of W/O emulsion in the method of new gravity sedimentation method in theoretical analysis and experimental verification.The influence of some factors such as degree of emulsification,concentration of dispersed phase,thickness of composite fiber module on internal flow field and separation performance of conjugate fiber during coalescence and separation process were studied.The research was realized in deepmethanol removal system by carbon 4.The conclusions were as follow:1.New gravity sedimentation method can measure the range of the distribution of emulsion size exactly.The separation performance can be improved effectively by analyzing the influence of modular fiber coalescence separation module on redispersible effect of emulsion size distribution and setting up two stage combined fiber coalescence and separation module.2.Flow velocity and emulsion particle size distribution are two major factors which affect the separation performance in the process of combined fiber coalescence separation process.The influence degree of each factor on separation performance is:flow rate>emulsion particle diameter>coalescence module thickness>volume specific surface area>dispersed phase concentration.Under given operating conditions,there is a critical value for the velocity of coalescence and separation of composite fibers under which the separation efficiency is basically constant with the increase of flow rate.The critical value of velocity in this system is 0.7m/min.3.The pressure drop of the coalescence module increases linearly with the increase of flow rate and module thickness,and increases with the decrease of porosity.The fluid has an obvious acceleration in the fiber gap,and the velocity distribution in the fiber gap shows a"M" distribution.