Centrifuges peeler

The presence of the residual heel is not avoidable in either case, and it may be necessary to recondition it by suitable washes in order to restore its drainage properties. Some designs incorporate cake feeler/leveller mechanisms, which ensure that an even cake is formed. 

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Rotary-Siphon Peeler Centrifuges In this type of centrifuge, a partial vacuum is drawn on the outer diameter or tne filter such that the filtrate flows through the cake under both centrifugal force as well as a positive pressure difference of about I atm or less. Thus, a higher rate of filtration takes place due to the increased driving force. 

Peel-apart pack films, Fuji, 19 312 Peeler centrifuge, 5 544 22 390-391 Peeling reaction, of polysaccharides, 22 27-28... 

Peeler centrifuges are also batch-continuous machines where the cake is removed by a plough. Different solids content feedstocks can therefore be handled in this type of unit, provided that they do not clog up the filter medium. A high degree of automation can be achieved with this type of unit. 

Horizontal Peeler Centrifuge—Operating Method and Mechanical Design. 18-129... 

The solids distribution profile may tend to be parabolic with thicker cakes near the bottom of the basket, tapering down toward the top, since the G-field is perpendicular to the force of gravity. This is especially true with fast-sedimenting solids that will settle toward the basket bottom before the slurry is fully accelerated by the basket. The coarser solids can settle toward the basket bottom, while the finer solids deposit preferentially toward the top. This can result in uneven filtration resistance in the cake, affecting the wash pattern and efficiency of the wash. In cases where this is a concern, a rotating feed cone may be better for even distribution, or a horizontal peeler centrifuge may be better suited to the application. 

The peeler centrifuge will distribute the solids more evenly since it is not feeding perpendicular to gravity as is the vertical basket. This... 

The peeler centrifuge can provide higher centrifug forces than can vertical baskets, for increased performance and flexibihty. 

Peeler centrifuges are available in larger sizes than vertical centrifuges—up to 2100-mm (83-in) diameter. 

The peeler centrifuge is also capable of automatic heel removal by several methods dissolving the heel, reslurrying and discharging the heel wet and diverting downstream, or diy heel removal pneumatically. Pneumatic heel removal can be accomplished either from within the basket or from outside the basket. 

FIG. 18-166 Peeler centrifuge cross section. (Krauss Maffei Process Technology.)... 

Pressurized Siphon Peeler Centrifuge Theoretically, the same principle can further increase driving force with overpressure in the process housing for example, 3-bar overpressure would produce up to 4-bar pressure gradient across the cake. In practice, to date this has not been utilized due to the complexity of the installation. 

Pharma Peeler Centrifuge For apphcations requiring hygienic operation, a special type of peeler centrifuge was developed in the 1990s (Fig. 18-169). 

Fig. 9 Peeler centrifuge. (View this art in color at www. dekker.com.)...

Medium speed filtering materials are suited to vacuum equipment and peeler centrifuges. 

Peeler centrifuges, being unaffected by the force of gravity in the distribution of the cake, tend to have more even cakes, although nonuniformity can still occur due to the feeding mechanism. 

The horizontal peeler centrifuge (Fig. 4) is a variation of the vertical basket. Up to 80 inches in diameter and producing as much as 100 tons per... 

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