Research On Structure Optimization And Flow Field Analysis Of Dynamic Hydrocyclone

The dynamic hydrocyclone which developed from hydrocyclone was a promoting and high-efficiency separation equipment. With the in-depth study, the structural problems of dynamic hydrocyclone appeared. Promotion and application of it were constrained. Moreover, the study on flow field of dynamic hydrocyclone was not consummate. In the past, the optimization design of dynamic hydrocyclone always depended on experience. With the rapid development of the numerieal simulation on flow field analysis, it provided strong tool for structure optimization and design.In this paper, the present development and appliance of dynamic hydrocyclone were introduced. The main structure problems leading to vibration and bad bearing lubrication were analyzed. Solutions were proposed and improvement design on dynamic hydrocyclone was completed. It was concluded from the vibration performance and oil dewatering test that the improved structure was reasonable. Variation rules of pressure characteristics and separation efficiency under different operating parameters were obtained too.Based on algebraic slip model (ASM) of Euler-Euler method, RNG k-εturbulence model and Single Reference Frame (SRF), the mathematical model of two-phase flow field in dynamic hydrocyclone was established. Numerical simulation was carried out by using CFD software FLUENT with control volume method and SIMPLE arithmetic method. The rules of velocity distribution, pressure distribution and oil-water distribution were obtained. The comparison results of simulation results and experimental measured data verified that the mathematical model and numerical simulation method were reasonable.Using numerical simulation method, optimization was done to the rotating fence. The results of simulation indicated that under the certain flow area, the rotating fence with straight vanes of 75mm can best balance the stationarity of the flow field, pressure loss, liquid vortex intensity and separation performance. The rotating fence with spiral vanes of angle of 60°can form enough intensityof lquid vortex without excessive pressure loss which is uperior to other structure.