Jul 12

Decanter centrifuge is widely used in industry to separation solids from liquid at fast speed. Without decanter centrifuge industrial process will be way slowed down.

There are many factors affecting the operation of decanter centrifuge, many people think it mysterious while others think decanter centrifuge a common equipment and there is nothing weird.

First is the centrifugal force, which is usually defined as times the centrifugal force than regular gravity. The parameter depends on the diameter of rotating bowl of decanter centrifuge, and the rotating speed. Centrifugal force is more sensitive to bow diameter than rotation speed as G force is proportional to the square of bow diameter.

With higher G force, settlement time for solids is reduced to seconds instead of a few hours with gravity settlement.

Another consideration is the separation speed. This is proportional to the gravity difference between solids and liquid. The smaller the difference, the slower the settlement. If gravity difference between solids and liquid is trivial, separation will take extended long time.

Particle size also affect separation speed. For bigger particles, it is easy for them to deposit because buoyancy can be neglected for bigger particles. However as particle sizes become smaller, buoyance becomes important, and in the extreme condition, buoyance can balance out gravity force and small particle will float in the liquid and never come to bow wall.

Differential speed between scroll and rotating bowl is another important consideration for separation. This differential speed must be optimized to minimize case thickness as it will affect discharge quality. Higher differential speed results in good throughput speed but less clear liquid. Solids settlement becomes even more complex when there is both big particles and small particles, with different gravity.

Above is a few factors contributing to the clarity of liquid. There are other factors impacting performance of decanter centrifuge. Designers need to prioritize these factors to make the equipment tailored to specific application.decanter-centrifuge

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written by Decanter Centrifuge


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