Study Of Influence Of Coalescence Internal On The Three-phase Separator Separation Performance And Flow Field Distribution

This paper mainly studied the coalescence internals and flow field of the three-phase separator by the dynamic experiment,numerical simulation and theoretical analysis.It is concluded from the trapezoidal coalescence internal experiment that: On the installation angle aspect,the horizontal structure's oil concentration of water outlet is 11.1% lower than that of the vertical installation structure,and water content of the oil outlet is 4.0% lower than that of the vertical installation structure.Under the same inlet flow rate condition,with the increase of the coalescence internal's length within a certain range,separation performance gradually becomes strong.But at the same time,it also causes local vortex or short circuit flow phenomena in the separator.Under certain inlet flow rate and coalescence internal length,certain spacing between coalescence internal installed is more conducive to the separation of the oil and water.On the basis of the above experiments,the changing plate spacing test scheme is proposed.Through comparing experimental results it is found that: Compared with the equal plate spacing structure,the oil concentration of water outlet reduces by 23.2% and water content of the oil outlet reduces by 2.89%.It also weakens disturbance and destruction in the internal flow field due to coalescence internal increase and slowed down the scaling velocity between the coalescence internal plates.After research on lozenge honeycomb coalescence internal,it is found that: With the increase of the coalescence internals' opening rate within a certain range,it is helpful to improve the efficiency of oil and water separation.Through the experiment of gradually changing the opening rate of coalescence internal,it is found that: When the first set of coalescence internal is not perforated,the separation performance becomes stronger with the increase of coalescence internals' opening rate.When the first set of coalescence internal is perforated,it is not conducive to the separation of oil and water.On the basis of all above experiments,this paper also uses Fluent 14.5 fluid simulation software to calculate the process of oil-water separation in the coalescence internal.Through the numerical study it is concluded that: The computational model is appropriate.When the oil-water two phase flow through coalescence internal,it will appear a repeat state of oilwater multilayer distribution,and there exists local vortex or short circuit flow at top of the coalescence internal.Taking both of the experiment and numerical studies into consideration,this paper finally summarizes and models the oil-water separation process with and without the coalescence internal and gets the separation performance calculation equation of different models.The research results have a certain guiding significance to develop efficient and compact three-phase separator that is suitable for offshore platform.On the engineering practice aspect,it can provide effective experimental data and theoretical support for practical application.