Investigation of Stagnant Zones in Centrifuges

Abstract:

Centrifuging is one of the most complicated technological processes, and centrifuges are the ones of the most complex technological machines. Not all the questions of the theory of centrifuges have been sufficiently developed, in particular, there is no reliable description of hydrodynamic flows in the process of centrifugation, resulting in the impossibility of an accurate prediction of the separation of heterogeneous systems. Circulation and stagnant (“dead”) zones often appear in centrifuge casings, which lead to uneven residence time of the fluid flow and reduced productivity of the centrate. To improve the construction of these machines, as well as to substantiate the technological mode of their operation, experimental studies were conducted, aimed at identifying the dependence between a proportion of the stagnant zones and the rotor speed. Determination of proportion ofthe stagnation zones was carried out by processing and analyzing the response curves obtained at the centrifuge output, after creating a pulsed input disturbance. Studies have shown that an increase in the rotor speed from 350 to 750 rpm leads to a decrease in proportion of the stagnation the stagnation zones in the centrifuge from 12% to 4.5%, thereby contributing to the intensification of the centrifugation process.

• Periodical: Solid State Phenomena (Volume 299)
• Pages: 1005-1009
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.299.1005
• Online since: January 2020
• Authors: Maksim I. Filimonov*, Andrey E. Novikov, Mariya I. Lamskova
• Keywords: Centrifuge, Refining, Response Curves, Rotor Speed, Stagnant Zones, Suspension

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