Study On The Influence Of The Outlet Structure Of The Desander Top On The Escape Of Light Fluid

In this paper,the cyclone separator has the outstanding advantages of simple structure and high separation efficiency.By modifying the top outlet structure of the ordinary hydrocyclone to improve the separation efficiency,that is,the spiral guide vane is installed at the overflow pipe of the sand separator The computational fluid dynamics fluent simulation software and theoretical analysis were used to study the effect of the structural parameters of the top outlet of the liquid-solid spiral hydrocyclone on the separation efficiency of the sand remover.First,the initial geometric model is established according to the separation principle of the hydrocyclone and the structural characteristics of the spiral guide vane,and then the meshing and boundary conditions are set.The RSM Reynolds stress model was used to simulate the internal distribution of the liquid flow field.The second-order upwind style and SIMPLEC algorithm were used to simulate the velocity,pressure and turbulence distribution in the two phases in the separator.The fluent simulation software was used to analyze the internal flow field.Then,through analysis and comparison with the ordinary straight cyclone,the superiority of the spiral cyclone in separation performance is obtained from the tangential velocity,static pressure and turbulence distribution.Then comprehensively use the characteristics of Solidworks drawing software and fluent simulation software to change the structural parameters of the spiral deflector at the outlet of the sand remover.Through numerical simulation research and analysis,it is found that with other structural parameters unchanged,the thickness of the spiral The separation efficiency increases first and then decreases;as the number of spiral blade turns increases,the separation efficiency of the cyclone increases;as the pitch of the spiral blade increases,the separation efficiency of the sand remover increases first and then decreases;the guide blade When the inclination is 4.2 degrees,the separation efficiency of the sand remover is the largest.Secondly,the effects of the insertion depth of the overflow pipe and the height ratio of the cylindrical section dv and the thickness of the overflow pipe on the separation performance of the sand remover are also simulated,where the pressure drop decreases first and then increases whendv gradually increases;As the thickness of the overflow pipe increases,the pressure drop gradually increases.Finally,a simulation study was conducted on the effect of operating parameters,and it was concluded that when the fluid inlet flow rate is 8 m / s,the separation performance is better at this flow rate compared to other flow rates;the effect of medium viscosity on the separation performance of the cyclone is Determined by the size of the viscosity,the greater the impact on the separation.Through the above simulation research,the analysis has obtained the influence law of the change of the structural parameters and operating parameters of the sand remover outlet on the separation performance,which provides a reliable theoretical basis and reference for future engineering design and practical application.