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There is a differential speed between the decanter bowl and the scroll, which is created by a gear unit on the industrial decanter centrifuges. The differential speed determines the solid content in the outfeed.
The length of the dewatering beach and the differential speed between the bowl and conveyor can affect the solid content of the separated solids. [8] Optimum residence time of solids in the centrifuge and the water content of the separated solids can be achieved by adjusting the differential speed.
Screen scroll centrifuges, which are also known as worm screen or the conveyor discharge, instigate the solids to move along the cone through an internal screw conveyor. The conveyor in the centrifuge spins at a differential speed to the conical screen and centrifugal forces approximately 1800g - 2600g facilitate reasonable throughputs.
Decanter centrifuges, in which there is no physical separation between the solid and liquid phase, rather an accelerated settling due to centrifugal acceleration. Though most modern centrifuges are electrically powered, a hand-powered variant inspired by the whirligig has been developed for medical applications in developing countries.
Differential centrifugation, on the other hand, does not utilize a density gradient, and the centrifugation is taken in increasing speeds. The different centrifugation speeds often create separation into not more than two fractions, so the supernatant can be separated further in additional centrifugation steps.
For high speed separation and highly corrosive suspension process, high-strength stainless steel (such as duplex and higher-grade duplex) is used for the bowl and accessories construction. [ 12 ] For liquid that contains highly abrasive fine particulates, areas which are prone to wear and tear need to be protected by tungsten carbide and nickel ...
Speed-sensitive differentials limit the torque difference between the outputs, Trq d , based on the difference in speed between the two output shafts. Thus for small output speed differences the differential’s behavior may be very close to an open differential. As the speed difference increases, the limiting torque increases.
The meter is "read" as a differential pressure head in cm or inches of water and is equivalent to the difference in velocity head. The dynamic pressure, along with the static pressure and the pressure due to elevation, is used in Bernoulli's principle as an energy balance on a closed system .