Working principle of horizontal spiral centrifuge

Horizontal spiral centrifuge is a type of spiral discharge settling centrifuge. It mainly consists of a high-speed drum, a screw conveyor with a hollow shaft that rotates in the same direction as the drum and has a slightly lower speed than the drum, and a differential. When the suspension to be separated is sent into the drum by the hollow shaft, it is immediately thrown into the drum cavity under the centrifugal force generated by high-speed rotation. The high-speed rotating drum generates strong centrifugal force, which throws solid particles with higher density than the liquid phase onto the inner wall of the drum, forming a solid layer (called a solid ring layer due to its ring shape); Due to its low density and centrifugal force, water can only form a liquid layer inside the solid ring layer, known as the liquid ring layer. Due to the different rotational speeds of the spiral and the drum, there is a relative motion (i.e. speed difference) between the two. The relative motion between the spiral and the drum is used to slowly push the sludge in the solid ring layer to the cone end of the drum, and after passing through the drying zone, it is continuously discharged through the outlet distributed around the circumference of the drum; The liquid in the liquid ring layer is continuously "overflowed" by gravity from the weir to the outside of the drum, forming a separated liquid.