Overview of the hottest centrifuge

2022-10-19
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Overview of centrifugal separator (Part 2)

the important index to measure the separation performance of centrifugal separator is the separation factor. It indicates the ratio of the centrifugal force on the separated material in the drum to its gravity. The larger the separation factor is, the faster the separation is usually, and the better the separation effect is. The separation number of industrial centrifugal separator is generally 100 ~ 20000, the separation number of overspeed tubular separator can be as high as 62000, and the separation number of analytical overspeed separator can be as high as 610000. Another factor that determines the processing capacity of the centrifuge is the working area of the drum, which has a large working area and a large processing capacity

filter centrifuges and sedimentation centrifuges mainly rely on increasing the diameter of the drum to expand the working surface on the circumference of the drum; In addition to the circumferential wall of the drum, the separator also has additional working surfaces, such as the discs of the disc separator and the inner cylinder of the chamber separator, which significantly increases the settlement working surface

in addition, the finer the solid particles in the suspension, the more difficult it is to separate, and the fine particles taken away from the filtrate or separation liquid will increase. In this case, the centrifuge needs a higher separation factor to effectively separate; When the viscosity of the liquid in the suspension is high, the separation speed slows down; The density difference of each component of suspension or emulsion is large, which is beneficial to centrifugation as a special composite manufacturer, while the density difference of each component is not required for suspension centrifugal filtration

the selection of centrifugal separator must be based on the size and concentration of solid particles in the suspension (or emulsion), the density difference between solid and liquid (or two liquids), the viscosity of liquid, the characteristics of filter residue (or sediment), and the separation requirements. To meet the requirements of the moisture content of filter residue (sediment) and the clarity of filtrate (separation liquid), which type of centrifugal separator is preliminarily selected. Then, according to the processing capacity and the automation requirements of the operation, the type and specification of the centrifuge are determined, and finally verified by the actual test

generally, for suspensions containing particles larger than 0.01 mm, filter centrifuges can be selected; For fine particles or compressible deformation in suspension, sedimentation centrifuge should be selected; When the suspension has low solid content, small particles and high requirements for liquid clarity, a separator should be selected. Therefore, a tensile machine with a large stroke should be equipped for testing the tensile properties of flexible packaging materials

the future development trend of centrifugal separators will be to strengthen the performance of separation under high temperature impact or low temperature impact, develop large centrifugal separators, improve the slag unloading mechanism, increase special and combined drum centrifuges, strengthen the research of separation theory and study the optimal control technology of centrifugal separation process, etc

strengthening the separation performance includes increasing the rotating speed of the drum; Add new driving force in the process of centrifugal separation; Speed up slag pushing; Increase the length of the drum that is still in the downward bottoming stage, and prolong the time of centrifugal sedimentation separation, etc. The development of large-scale centrifuges is mainly to increase the drum diameter and adopt double-sided drums to improve the processing capacity, so as to reduce the equipment investment, energy consumption and maintenance cost of handling unit volume materials. In terms of theoretical research, it mainly studies the fluid flow in the drum and the formation mechanism of filter residue, and studies the calculation method of minimum separation and treatment capacity

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