The gearbox is powered through a belt drive and explosion proof electric motor. The conveyor in this particular type is powered through a gearbox, which establisheds the differential speed of the conveyor to the bowl. A general design which is discussed here includes a bowl which is belt driven from an explosion proof electric motor. They differ by size, horsepower required to power them and the details of how the conveyor and bowl are powered. There are many different models available, which conform to this same basic design. Decanter centrifuge for waterbased drilling fluid The liquid which has the solids being removed is volumetrically displaced above the sedimenting solids and follows the helix of the conveyor to the liquid discharge end. These solids sediment to the inner wall of the rotating bowl and the scraping and transported to the solids discard end of the bowl by the scraping and transport of the screw conveyor. This feed mud enters the bowl and the high centrifugal forces generated from the rotational speed of the bowl cause the solids to separate from the liquid due to the dramatically increased “g” forces on the solids. The feed mud is a mixture of a liquid having relatively fine solids entrained therein. In the particular case considered here the conveyor rotates in the same direction as the bowl but at a slightly slower speed. The conveyor is supported by a second set of bearing internal to the bowl. This type of decanter centrifuge features a rotating cylindrical section called the bowl, supported by bearings with a spiral screw conveyor disposed inside of the bowl.
A decanter centrifuge is designed to process a physical mixture of two constituents: a liquid and a solid mechanically separating one from the other.
Decanting bowl centrifuges are well known in the industry for separating fine solids out of drilling mud. A brief review of decanter centrifuge is beneficial prior to a discussion of control objectives and methods.
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