Performance Research Of Impeller 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, centrifuges and hydrocyclone. However, lacks of them were also exposed, so the development of more appropriate separation equipment is necessary.This paper designs impeller dynamic hydrocyclones and the performance testing systems of hydrocyclones. It does systematic experimental tests and theoretical analyses to hydrocyclones. In the experiment, it tests and analyses the impact of motor speed, split ratio, feed flux and other parameters on pressure loss and separation efficiency of three dynamic hydro cyclones. The result shows that the higher the motor speed, the bigger the centrifugal strength, the better the separation effect, but the overflow pressure drop is on the increase at the same time. Higher split ratio can effectively improve the separation efficiency with less impact on pressure drop. The increase of feed flux has less effect on the separation efficiency, but the pressure drop of overflow and underflow are increasing. Through orthogonal analysis, the primary effect factor on separation efficiency is motor speed, followed by the split ratio and feed flux. The primary influential factor on pressure drop is motor speed, followed by the feed flux and split ratio. Compared with ordinary hydrocyclone, impeller dynamic hydrocyclone has higher separation efficiency, bigger feed flux range and smaller pressure drop.Based on the experimental results, it can be obtained that the flat-vane cylinder dynamic hydrocyclone have the highest separation efficiency, followed by the vortex-board cylinder dynamic hydrocyclone and flat-vane cone dynamic hydrocyclone. Compared with the results of experimental prototype loss of pressure, flat-vane cone dynamic hydrocyclone have the smallest pressure drop, followed by he vortex-board cylinder dynamic hydrocyclone and the flat-vane cylinder dynamic hydrocyclone.Having simplified the three sort of experimental prototype models and established N-S equations and continuous equation, I get the basic information of the inner flow. It is shown by the simulation results that the flow in the impeller dynamic hydrocyclone has a high tangential velocity about 14～15m/s, and the centrifugal force is 5～10 times bigger than the ordinary hydrocyclone. Compared with the experimental data and the simulation results, it can be proved that the mathematic model is appropriate for this problem. Based on the analysis of the three sort of experimental prototype models' comprehensive properties and utilizing the mathematic model established, the improvement scheme of dynamic hydrocyclone has been given.To analyze the reason of overflow pressure drop obtain that the force vortex is the primary reason of overflow pressure drop. It can be controlled by enlarging the diameter of vortex finder or setting the diffuser in order to weaken and eliminate the force vortex.The impeller dynamic hydrocyclone has a bigger centrifugal force, higher separation efficiency, smaller pressure drop and on clogging. Therefore it must have good prospects and the high value of commercial application.