Working principle and separation requirements of 3 phase decanter centrifuge

- Jul 05, 2019-

The working principle of the 3 phase decanter centrifuge is that the two liquid phases and one solid phase enter the centrifuge, and rely on the centrifugal force field to expand it several thousand times. The solid phase is settled under the action of centrifugal force, and the two liquid phases are also Layering occurs to achieve solid-liquid-liquid three-phase separation, and the body is separately discharged under the action of a special mechanism. The entire feed and separation process is continuous, closed, and automated.


The 3-phase decanter centrifuge is mainly composed of drums, spirals, differentials, frames, casings, motors and other components during the production process. The drum adopts a double-vertebral angle design, and the inner wall of the drum is specially designed with a longitudinal concave-convex groove for improving the efficiency of the spiral conveying solid phase. The working surface of the spiral blade has a hard alloy protective layer, which effectively improves the wear life of the spiral blade. The main motor is controlled by the main inverter, and the sub motor is controlled by the sub inverter. The frequency of the motor can be adjusted freely. The power supply of the auxiliary frequency converter is provided by the main frequency converter, which is called DC common bus power supply. The DC common bus power supply realizes the energy feedback when the auxiliary motor is in the working state of the generator, which can effectively save energy.


The 3-phase decanter centrifuge delivers the material to be separated from the feed pump to the centrifuge drum. The high-speed rotating drum produces a strong centrifugal force to settle the solid phase particles larger than the liquid phase density to the inner wall of the drum. Different from the rotation speed of the drum, there is relative movement between the two (ie, the difference in rotation speed, adjustable), and the solid (slag) with high density settles on the drum wall. The clear liquid with different density of the two phases forms a concentric cylinder, the lighter liquid phase is in the inner layer, and the heavier liquid phase is in the outer layer. The thickness of different liquid rings can be adjusted by the liquid regulating plate (ie, the water content in the oil or the oil content in the water is adjustable), and the slag deposited on the wall of the rotating drum is transferred from the screw conveyor to the cone end of the rotating body, and the row is discharged. The material port is discharged into the solid accumulation tank, and the water and oil are respectively discharged from the respective outlets. The entire oil, water and slag separation process is automatic feeding and automatic discharging.