Working Principle of Decanter Centrifuge

A centrifuge works on the principle of accelerated settling. By imparting additional G-forces to the content material of a centrifuge, solids (in a solids-laden fluid) will settle much faster. To understand how a decanter centrifuge works after desilter, first look at a simple sedimentation vessel. Solids in this fluids will settle at the bottom from the vessel over a period of time.

One way to speed up the process of settling is to reduce the height from the vessel, so the solids do not have as far to drop. If a specific volume is required, the vessels dimensions can be lengthened or widened. Depending on the rheological properties with the fluids and the size and density in the solids, settling time can still prove quite slow.

Screw pump is a positive displacement pump that uses one or several screws to move fluids or solids along the screw axis. It is an ideal pump for feeding decanter centrifuge. The major benefit to use a positive displacement pump is that it will not break the fine solids to smaller, so the centrifuge can separate the solids easily. Centrifugal force of centrifugal pump will cut the solids to smaller, it is not good for centrifuge's operation.

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