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Working principle of horizontal spiral centrifuge

Jun 16, 2020

Horizontal spiral centrifuge is a kind of spiral unloading sedimentation centrifuge. The blade on the screw pusher is pushed to the slag discharge port of the small end of the drum to discharge, and the liquid phase overflows through the overflow hole of the big end of the drum. Such continuous circulation in order to achieve the purpose of continuous separation.

Horizontal spiral centrifuge is a spiral discharge sedimentation centrifuge. It is mainly composed of a high-speed rotating drum, a screw conveyor with a hollow rotating shaft and a differential, which are the same as the rotating direction of the drum and the rotation speed is slightly lower than the rotating drum. After the suspension to be separated is fed into the drum by the hollow shaft, it is immediately thrown into the drum cavity under the action of the centrifugal force generated by the high-speed rotation. The high-speed rotating drum generates a strong centrifugal force and throws solid phase particles with a density greater than the liquid phase on the inner wall of the drum to form a solid layer (because the ring is called a solid ring layer); due to the low density of water, the centrifugal force is small Therefore, a liquid layer can only be formed inside the fixed ring layer, called liquid ring layer. Due to the different rotation speeds of the screw and the drum, there is relative movement between the two (that is, the difference in rotation speed). The relative movement of the screw and the drum is used to slowly push the sludge of the fixed ring layer to the cone end of the drum and pass through the drying area. After that, it is continuously discharged from the outlets distributed on the circumference of the drum; the liquid in the liquid ring layer is continuously discharged from the weir mouth by gravity to the outside of the drum to form a separation liquid.