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<strong>Glatt</strong> – New Filter Design For More Flexibility<br />
Of Cont<strong>in</strong>uous Production Plants<br />
Plate filter design – space sav<strong>in</strong>g<br />
filters on display at ACHEMA<br />
Fluid bed equipment requires high build<strong>in</strong>gs,<br />
which are not always available.<br />
Additional space is necessary to service<br />
the filter on top of the already tall equipment.<br />
Up to 2.5 meters are required<br />
above the fluid bed contraption <strong>in</strong> order to<br />
exchange 6m long filter bags.<br />
Manufacturers have been offer<strong>in</strong>g the<br />
possibility to place filter elements horizontally<br />
<strong>in</strong>to the filter hous<strong>in</strong>g for <strong>in</strong>stallations,<br />
where dismantl<strong>in</strong>g of the filter elements to<br />
the top is not possible. These filters are<br />
serviced from the side, where the clean<br />
gas also leaves the unit.<br />
<strong>Glatt</strong> has now, for the first time <strong>in</strong>tegrated<br />
such horizontal filters <strong>in</strong>to the fluid bed.<br />
The height of the equipment is decreased<br />
by putt<strong>in</strong>g the clean gas chamber to the<br />
side, result<strong>in</strong>g <strong>in</strong> no space be<strong>in</strong>g required<br />
above the fluid bed unit. Doors on the<br />
side of the clean gas chamber enable<br />
easy access to the filter elements. Exchang<strong>in</strong>g<br />
of the filter elements is <strong>in</strong> actual<br />
fact easier from the side compared to the<br />
top.<br />
New pilot plant ProCell 25 for <strong>Glatt</strong> laboratory<br />
with highly flexible filter system at ACHEMA<br />
By Sebastian Pfütze, <strong>Glatt</strong> Weimar<br />
A further advantage is the possibility to<br />
design the room at the side of the clean<br />
gas chamber as a wash room with a solid<br />
floor and tight connection to the fluid bed<br />
unit. The dust-loaden filters are handled<br />
only with<strong>in</strong> this room, contam<strong>in</strong>at<strong>in</strong>g no<br />
other parts of the plant with the filter dust.<br />
Hav<strong>in</strong>g removed the filter plates the complete<br />
fluid bed unit can be washed <strong>in</strong><br />
place. With this design it is very rarely necessary<br />
to open the fluid bed unit <strong>in</strong> the<br />
production area.<br />
The plate filter has been tested on a prototype<br />
designed GF 20 <strong>in</strong> our laboratory<br />
with the first successful application tests<br />
be<strong>in</strong>g carried out <strong>in</strong> March 2008. Our new<br />
PROCELL 25 demonstrat<strong>in</strong>g the plate filter<br />
will be on display at the ACHEMA 2009.<br />
This unit will be <strong>in</strong>stalled <strong>in</strong> our new laboratory<br />
build<strong>in</strong>g and will be available for<br />
tests <strong>in</strong> the fourth quarter of 2009.<br />
WIP bag filter – no dismantl<strong>in</strong>g of<br />
filter bags dur<strong>in</strong>g wash cycle<br />
Wash <strong>in</strong> place – bag filters have also existed<br />
for several years. <strong>Glatt</strong> has frequently<br />
used them for the design of cont<strong>in</strong>uous<br />
fluid beds. Wash<strong>in</strong>g nozzles are <strong>in</strong>stalled<br />
<strong>in</strong> the clean and raw gas chamber at the<br />
top of the filter bags. Dur<strong>in</strong>g the wash<br />
cycle they flush the filter bags from the<br />
raw gas side and wash down all the dust<br />
on the surface.<br />
The quality of the wash<strong>in</strong>g process depends<br />
on the product. Our experience<br />
shows that <strong>in</strong> many applications the filters<br />
are clean for the next product.<br />
In order to improve the efficiency of the<br />
WIP step and to adjust the design of the<br />
specific granulator needs, we have now<br />
developed our own design of spray nozzles<br />
and filter bags. The filter has been <strong>in</strong>stalled<br />
<strong>in</strong> a GFG 250 and will soon be<br />
tested <strong>in</strong> full scale. Tests on our pilot unit<br />
were successful <strong>in</strong> 2008.<br />
After wash<strong>in</strong>g and r<strong>in</strong>s<strong>in</strong>g the filter bags<br />
are dried <strong>in</strong> the fluid or spouted bed unit,<br />
and the next production campaign can<br />
start. This filter has a walk-<strong>in</strong> clean gas<br />
chamber for servic<strong>in</strong>g the filter bags and<br />
the pulse back system and is also washed<br />
<strong>in</strong> place. Enter<strong>in</strong>g the clean gas chamber<br />
is only necessary dur<strong>in</strong>g ma<strong>in</strong>tenance.<br />
Hence nobody needs to enter the process<strong>in</strong>g<br />
equipment dur<strong>in</strong>g normal production<br />
and clean<strong>in</strong>g cycles.<br />
GF/ProCell 25 at ACHEMA<br />
A new pilot unit will be <strong>in</strong>stalled <strong>in</strong> the laboratory<br />
extension at GLATT, Weimar. All<br />
commonly used filter types can be tested<br />
with this unit:<br />
l pleated cartridges,<br />
l filter bags,<br />
l metal filter cartridges,<br />
l filter plates.<br />
The GF/ProCell 25 is not only flexible with<br />
regards to the filter system, but also a flexible<br />
spray<strong>in</strong>g system and the possible<br />
change of the <strong>in</strong>let air chamber to switch<br />
between ProCell and <strong>Glatt</strong> fluid bed (GF)<br />
demonstrates the state of the art design of<br />
the pilot unit.<br />
Additional <strong>in</strong>formation at::<br />
<strong>Glatt</strong> Ingenieurtechnik GmbH<br />
Nordstraße 12<br />
99427 Weimar / Deutschland<br />
Telefon +49 -3643 47-1502<br />
Telefax +49 -3643 47-1271<br />
eMail: redaktion@glatt-weimar.de<br />
14 International Times No. 27 · March 2009
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