Structure Study Of Disc Centrifuge For Crude Oil Desanding

Disc centrifuge has the characteristics of small area,high speed and high separation precision,and is widely used in practical industrial production.In view of the problem of fine sand with particle size as small as 10μm in oil produced from oil field,disc centrifuge has obvious advantages in separation accuracy.In view of the influence of disc centrifuge and structural parameters on separation efficiency,most of the previous scholars studied from the directions of disc gap and half-cone Angle,and ignored the influence of the location of the ribs on the separation efficiency of disc centrifuge.Aiming at the above problems,the influence of different structural parameters such as disc gap,halfcone Angle and ribs position on the internal flow field and centrifuge separation performance of disc centrifuge was studied by using the control variable method in Fluent,providing a basis for optimizing the structure of disc centrifuge.The main research contents are as follows:(1)This paper takes DR S230/4-00-99 disc centrifuge as the research object,uses its structure size as the original model for modeling,and uses Fluent software for numerical simulation.Compared with the experimental results in the literature under the same working conditions,the error is less than 5%.The results show that the Reynolds stress model(RSM)can accurately reflect the flow field of the dish-type centrifuge,which can provide a reliable support for the subsequent study of adjusting the structure size.(2)Different structure param eters of the disc centrifuge each layer of disc gaps outlet flow and sand phase concentration distribution has a similar law,that is,the flow rate between the lower disc gap is smaller than the flow rate between the upper disc gap,and the sand phase con centration at the outlet of the upper disc gap is higher than the outlet of lower disc gap,which indicates that the oil sand mixture on the lower disc gap between the separation effect is better.(3)Different dis c centrifuge models were established by ad justing disc gap and half-cone Angle,and numerical simulation was carried out.The results show that with the decrease of disc gap,the separation efficiency of dis c centrifuge is not increasing,but increasing first and then decreasing,indicating that t oo large or too small disc gap will hinder the settlement of sand particles;With the increase of disc half-cone Angle,the separation efficiency increases,but too large half-cone Angle will affect the sand phase settlement and centrifuge processing capacity,so too large or too small disc half-cone Angle is not conducive to the actual production.(4)The ribs can effectively weaken the hysteresis of the material in the centrifuge and there is eddy current between the two adjacent ribs.Changing the position of the ribs can affect the flow field distribution between the two adjacent ribs.Decreasing the rotatio n Angle of the rib can increase the area of the settling area and prevent the fluid from moving in radial direction,but too small rotation Angle of the bar will weaken the eddy current movement of the fluid.Increasing the deflection Angle of the rib can make the centrifugal settlement area close to the center of the disc,but too large deflection Angle of the rib will make the uneven distribution of materials become serious,and will hinder the movement of sand particles to the big end of the disc,affect ing the settlement.