Oilfield drilling fluids recycling decanter centrifuge

The decanter centrifuge consists of a solid bowl, which rotates and contains the process. A screw conveyor, contained within the bowl, turns at a slightly different speed from the bowl. The KOSUN decanting centrifuge is a highly engineered piece of solids control equipment designed to separate insoluble suspended solids from a liquid. The centrifuge can be used to produce a relatively dry cake from the separated solids and are flexible enough to cope with a wide fluctuation in the feed material and still achieve excellent clarification and dewatering performance.

The liquid flows from the point where it is introduced to the pond to the liquid weirs at the large end of the rotating assembly. As the liquid flows through the pond, the g force causes the solids to settle out of the liquid and to sediment against the bowl wall. This causes a blanket of solids to build up against the bowl wall.

The differential speed between the bowl and conveyor has a direct effect on the cake solids. As the differential speed between the conveyor and bowl is reduced, cake solids are increased. This increases the retention time and maximizes compaction in the solids.

The solids loading rate also has an effect on cake solids. In general, as the solids loading increases, the percentage of solids in the cake decreases. This is not a direct relationship, but results from the requirement to operate the conveyor at a higher differential speed to remove the solids from the bowl. This reduces the time for sedimentation in the bowl, which in return lowers the cake solids.

KOSUN Decanter Centrifuge units are supplied with advanced controls for both variable speed bowl and scroll back-drive optimization making them easily configured to produce a wide range of sludge dewatering results. KOSUN decanter centrifuge is very easy to set up while being extremely robust, stable, and reliable in everyday use, without the ease of use detracting from the quality of the operating results.

The decanter centrifuge will often produce better results than other dewatering equipment when secondary or biological sludges are present in the material to be processed. The primary reason for this is decanter centrifuges do not use filter media for separation and dewatering, which can often become blocked or blinded by biological sludges.