Study On Influences Of Structures On Erosion Of Wall And Separation Performance Of Conical Cyclone Desander

Cyclone desander used as separation equipment for oil and gas production process.The security and practicability of its application are the key problems that restrict its application and development.This paper used the method of FLUENT numerical simulation and theoretical analysis to study on the different structure parameters the conditions of internal flow and wall erosion of Cyclone Desander,the main research contents are as follows:(1)Based on the gas-solid separation principle to established geometric model of cyclone desander.Reynolds Stress Model(RSM),QUICK discrete scheme convection term,PRESTO!pressure gradient term and pressure-velocity coupling interpolation format SIMPLEC algorithm are used in numerical simulation for gas flow field of Cyclone Desander.The gas flow field velocity,pressure and turbulence distributions of cyclone desander are researched.(2)The cyclone desander in gas-particles two-phase flow are studied by numerical simulation,It is found that the size of particales can affect the trajectory and the separation efficiency.The gas-solid two-phase simulation shows that the desander wall parts wear serious areas mainly in the annular space,the helical-shaped grooves in separated barrel space and the lower cone.(3)Establish the wall erosion model,study the structural parameters of the cyclone affected sand wall wear.The results show that the exhaust pipe insertion depth on the growth of the annular space wall wear decreased,the cylinder and cone space increased;With the decrease of the taper,the wear rate decreases along the axial direction;With the increase of the entrance area,the wall wear of the annular space decreases gradually.(4)Simulation and discussion of desander of different structural parameters on cyclone desander pressure loss and separation efficiency influence:Hydrocyclone pressure drop with the exhaust pipe insertion depth increased with the cylinder height increases,decreases withincreasing taper.The separation efficiency of hydrocyclone sand increases with the increase of the exhaust pipe insertion depth,and decreases with the increase of cone taper,with the increase of height of cylinder section was first increased and then decreased.