Chemical Engineering December 2010 - 38

Feature Report
and the basket - also takes place between
the inner basket and the outer
basket. With two shorter baskets instead
of the one long basket, the twostage
centrifuges have the advantages
that the height of the cake is reduced,
the filtration resistance is lower and
the pushing force required is less than
in single-stage machines. Even if the
single-stage pusher centrifuges provide
a higher throughput rate due to
the higher cake volume in the basket,
the two-stage machines have become
established as the more popular version
today. Machines are also available
with three and more stages for
special applications (Figure 8).
The main fields of application are
crystalline products with average particle
sizes of around 80 µm up to 10
mm, and solids feed concentrations
from around 25 wt.%. Some examples
of applications are the dewatering of
ammonium sulfate, sodium chloride
and adipic acid.
Figure 8. Closeups of the interior of
two-stage (left) and three-stage (right)
pusher centrifuges
Final remarks
To select the right type of centrifuge
it is most important to maintain close
contact with the equipment manufacturer.
For the coordination of the full
system, it is also expedient for the
manufacturer to not only be able to
supply the complete range of centrifuges,
but also the equipment integrated
in the process line upstream
or downstream of the centrifuge. ■
Edited by Gerald Ondrey
Author
Peter Schmidt is sales engineer
for pusher and other
continuous centrifuges at
Andritz KMPT GmbH (Industriestrasse
1-3, 85256 Vierkirchen,
Germany; Phone:
+49-8139-80-299-113; Fax:
+49-8139-80-299-150; Email:
peter.s.schmidt@andritz.
com). He has been with KMPT
since 1997, first as a student
intern. From 2000-2008, he
was KMPT's project manager for pusher centrifuges.
Schmidt has a Diplom in mechanical engineering
from the Berufsakademie Ravensburg.
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Chemical Engineering December 2010

Table of Contents for the Digital Edition of Chemical Engineering December 2010

Contents
Chemical Engineering December 2010 - Cover1
Chemical Engineering December 2010 - Cover2
Chemical Engineering December 2010 - Contents
Chemical Engineering December 2010 - 2
Chemical Engineering December 2010 - 3
Chemical Engineering December 2010 - 4
Chemical Engineering December 2010 - 5
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Chemical Engineering December 2010 - Cover3
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