Structural principle and separation steps of wastewater decanter centrifuge

- Dec 24, 2018-

The wastewater decanter centrifuge is a continuously produced solid-liquid separation device which consists of a cylindrical-conical-cylindrical drum and a screw conveyor coaxial with it. The large cylindrical portion is a settling zone, the conical portion is a centrifugal dewatering zone, and the small cylindrical portion with a screen is a filtration zone.


When the material flows from the feeding pipe into the feeding cavity of the spiral drum, the coal slurry is thrown into the rotating drum under the strong centrifugal force, and the ratio of the solid particles to the water is large, and the solid particles are tightly attached under the action of the centrifugal force. On the wall of the tube. The water overflows from the overflow above the solid near the centerline. The drum has a screw conveyor with the same direction of rotation as the drum but a slightly lower speed.


The solid particles settled to the wall of the drum are moved to the cone section under the spiral conveyance; when the material passes through the cone section of the drum, it is transported from the bottom of the liquid to the liquid surface, and preliminary dewatering is performed in the cone section; preliminary dewatering of the cone section The material continues to move forward into the screen section under spiral conveying. The liquid remaining in the material is discharged through the screen under the action of centrifugal force to form a filtrate to achieve filtration and dehydration. The solid particles continue to move forward under the action of the auger until they are discharged.