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Wash in place – bag filters have also existed for several years. Glatt has frequently used them for the design of continuous fluid beds. Washing nozzles are installed in the clean and raw gas chamber at the top of the filter bags. During the wash cycle they flush the filter bags from the raw gas side and wash down all the dust on the surface.
The quality of the washing process depends on the product. Our experience shows that in many applications the filters are clean for the next product.
In order to improve the efficiency of the WIP step and to adjust the design of the specific granulator needs, we have now developed our own design of spray nozzles and filter bags. The filter has been installed in a GFG 250 and will soon be tested in full scale. Tests on our pilot unit were successful in 2008.
After washing and rinsing the filter bags are dried in the fluid or spouted bed unit, and the next production campaign can start. This filter has a walk-in clean gas chamber for servicing the filter bags and the pulse back system and is also washed in place. Entering the clean gas chamber is only necessary during maintenance. Hence nobody needs to enter the processing equipment during normal production and cleaning cycles.
The new pilot plant GF/ProCell 25, which will extend the future possibilities of the Glatt Technology Center in Weimar, provides all types of filters available and is live to see on the Glatt booth at ACHEMA 2009.
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