Principle Of The Centrifuge

Centrifugation is the use of a powerful centrifugal force generated by the high-speed rotation of the centrifuge rotor to accelerate the sedimentation velocity of the particles in the liquid, separating the sedimentation coefficients and buoyancy-density materials in the sample.

Conversion between centrifugal force (g) and rotational speed (rpm)

The conversion formula between the centrifugal force G and the rotational speed RPM is as follows:

G=1.11×10^(-5)×R×(rpm)^2

Where G is the centrifugal force and is generally expressed as a multiple of g (gravity acceleration).

10^(-5) is the negative fifth power of 10, (rpm)^2 the square of the rotational speed, R is the radius, and the unit is centimeter.

For example, with a centrifugal radius of 10 cm and a rotational speed of 8000 RPM, the centrifugal force is:

G=1.11*10(-5)*10*(8000)2=7104

That is, the centrifugal force is 7104g.

When the centrifugal force is 8000g, the rotation speed should be: 8489 or about 8500 rpm.

Application of centrifuge in the field of polymeric resins

  In the process of processing polyvinyl chloride (PVC), the processing capacity of the centrifuge can be up to 15~18t/h (based on dry powder), the solid content in the separated clear liquid is ≤100×10-6, and the separated slag contains The amount of liquid is less than 23%.

When processing polyethylene, polypropylene, and purified terephthalic acid (PTA) materials, since the medium is a flammable and explosive alkane organic substance, it is necessary to use an explosion-proof centrifuge protected by an inert gas. The oxygen content inside the site and inside the centrifuge is controlled outside the flammable range, thus avoiding accidents caused by accidents in equipment and operation.

The solid phase separated by the centrifuge can be sent to a gas flow drying tower or a bubbling bed through a shaft screw conveyor for drying.