Performance Research Of Central Feed-in Dynamic Hydrocyclone

Crude oil contains a lot of fine sand which has impact on the gathering and transportation system seriously.The equipments used for desanding are settlement pool,filter,centrifuges and hydrocyclone.However,lacks of them were also obvious.This paper combine the characteristics of centrifuge sand hydrocyclone,designs central feed-in dynamic hydrocyclone and the performance testing system of hydrocyclone,and does systematic experimental tests and theoretical analyses to hydrocyclone.Central feed-in dynamic hydrocyclone have several advantages such as having higher separation efficiency, having smaller decrease of pressure,having wider range of feed flux.Three experimental machines have three different impellers.This paper tests and analyses the impact of motor speed,split ratio,feed flux on pressure loss and separation efficiency of three experimental machines.The result shows that the higher motor speed,the higher separation efficiency and the smaller decrease of overflow pressure at small feed flux. The increase of split ratio can effectively improve the separation efficiency and enhance the decrease of pressure.The increase of feed flux has less effect on the separation efficiency,but the decrease of pressure are increasing.This paper compare the results and find that experimental machineⅢhave the highest separation efficiency,experimental machineⅡsecondly,experimental machineⅠhave the lowest separation efficiency,however the difference of the separation efficiency is unobvious. Based on the experimental results of pressure,it can be obtained that pressure performance of experimental machineⅠis best,experimental machineⅡsecondly,experimental machineⅢis last.The final result is that of experimental machineⅠhave the best performance.This paper simulate the flow field of new dynamic hydrocyclone and get the basic information of the flow field.It is shown by the simulation results that inner flow field is similar to normal hydrocyclone,but they have the bigger centrifugal strength,the tangential velocity of their inner is nearly 15m/s and the centrifugal force is 5～10 times bigger than the ordinary hydrocyclone.The relationship of pressure drop and size of impeller is show by simulation of impeller.The result can supply the guidance for optimizing performance of impeller.The central feed-in dynamic hydrocyclone has a favorable performance of pressure and separation.So it must have good prospects and the high value of commercial application in industrial process.