Numerical Simulation And Experimental Study Of Axial Flow Gas-Liquid Separator

At present,the majority of incoming fluids at oilfield central treating stations have not been subjected to pre-separation treatment of natural gas,making the subsequent oil-water separation effect of the process worse.In order to solve this problem,this paper studied a new type of axial gas-liquid separator for pre-separation treatment of liquid and gas to improve the efficiency of oil-water separation.The overall structure of the separator is mainly divided into three parts: the guide vane,the inner cylinder and the outer cylinder.It has the characteristics of simple structure,convenient installation,low pressure drop,high separation efficiency,and lays a foundation for its industrialization and application.In this paper,CFD numerical simulation software FLUENT is used to compare the performance of three types of guide vanes(spiral type,inclined plate type and arc type).The best separation performance is arc type.Then,the variation regularity of the internal concentration field,velocity field and pressure field in an axial-flow gas-liquid separator equipped with circular arc vanes.Changing the physical properties of the inlet,the effect of liquid viscosity on the separation performance of the separator was obtained.A multiphase flow loop designed for axial-flow gas-liquid separator experiment was independently designed.By comparing the pressure drop,it shows that the experimental results are in good agreement with the numerical simulation results,which verifies the accuracy and reliability of the numerical simulation results.At the same time,the separation efficiency and pressure drop of different guide vane angle,gas-liquid superficial velocity were experimentally analyzed.The influence of the structure of guide vanes(guide vane angle?number of vanes,diameter of center column,thickness of vane and straight line or not)on the separation efficiency and pressure drop was analyzed by numerical simulation.The numerical simulation of the guide vanes based on the orthogonal experiment shows that the guide vane structure with the best separation efficiency is obtained.The relationship between the guide vane structure and the separation efficiency is obtained by the difference analysis: vane angle> number of vanes> central column diameter.Through the theoretical analysis of the resistance loss of the guide vane,the formula of the resistance loss of the guide vane is deduced initially,and the multivariate linear regression of the two unknowns in the resistance loss formula is carried out by numerical simulation of the guide vane with 10 different structures.The prediction model of the resistance loss of the guide vane is obtained.After comparing with 9 other structural simulation data,the maximum error between the predicted value and the simulated value is 19.79%,the minimum error is 2.00%,the average error is 11.43%,which proves that the resistance prediction model has certain reliability and accuracy.The structure of the axial flow gas-liquid separator is improved and optimized,and the slitting treatment of the inner cylinder of the axial flow gas-liquid separator is mainly performed.The results show that the slits in the inner cylinder wall help to reduce the pressure drop and the axial velocity of the inner nozzle,thereby reducing the liquid carrying capacity of the overflow gas.At the same time,the influence of the slit width,length and position on the separation performance was analyzed.