Pressure simulation analysis on centrifugal separation field of horizontal spiral centrifuge

摘要

According to actual size of geometric screw centrifuge and CFD visualization methods, a geometry model is established, which has structured gridding produced to improve the accuracy of grid computation. The law of pressure change of the centrifugal separation field is studied. The results showed that the centrifugal motor dynamic pressure and static pressure considerably agree with the law of pressure change of the rotating vortex field. The dynamic and static pressure increases along the radial direction of the liquid ring, and reaches the maximum at the drum internal wall. The dynamic pressure and static pressure tend to increase with the drum speed rising and the maximum is at the drum wall. This means the highest strength appears in the drum central position. Therefore the intensity of the central drum should be strengthened during the design of the centrifuge drum. The static pressure changes dramatically in the spill plate, which affects the sludge content to some extent after dehydration, so the size of the pressure difference should be controlled.