Decanter centrifuge is used to treat oil slurry, waste water and drilling mud of drilling field. It utilizes centrifugal force to separate fine solids from slurry and water mixture. It is precision separation equipment for solids control mud system at oil and gas drilling rigs. It is used after solids control equipment. After the drilling mud treated by shale shaker, desander, desilter, or mud cleaner, the recovered mud will be pumped to decanter centrifuge for precision separation. The decanter centrifuge can be used to recover barite for reuse, or to remove the ultrafine solids from drilling fluids to reduce the mud weight, to make the drilling qualified for drilling activity.
When the slurry or drilling mud is fed to FHD decanter centrifuge internal bowl, the slurry flows in the channels between the conveyor’s flights, the heavy particles settle at an accelerated rate due to the centrifugal force generated by the rotating bowl. Sand particles settle almost instantly; then the finer, lighter particles settle. Particles that cannot be settled under the present centrifuge settings will be discharged with the liquid through the adjustable weirs on the liquid bowl head. Liquid exiting the liquid bowl head is directed through the liquid discharge outlet.
The settled solids form a cake on the inside of the bowl and are transported by the conveyor toward the narrow end of the bowl, or beach. As the solids travel across the beach, their free liquid film is lost due to centrifugal squeezing and drainage. When they are discharged at high velocity through the solids discharge ports on the bowl, they contain only the adsorbed moisture.
Since the discharge cake is very heavy and sticky due to the lack of free liquid, the centrifuge should be installed over the receptacle that is to receive the discharged solids. If this is not possible a slide or chute is needed to convey the solids. A steep angle is required to ensure self-cleaning, or a wash system must be provided to prevent material buildup.