Operating principle vertical centrifuges
Bottom discharge centrifuges
Highest efficiency
The solid-liquid separation with the bottom discharge centrifuge is effected discontinuously in a sequence of specific process steps. The individual process steps last from a few minutes to several hours depending on the characteristics of the product. Depending on the type of control system, the process can be fully automatic, semi-automatic or manual.
Filling
The suspension is applied evenly to the centrifuge basket via the feed pipe or optionally via the feed disk. The fill level control prevents overfilling of the basket.
Intermediate centrifugation
The basket accelerates to centrifuge the liquid from the surface of the cake.
Washing
After intermediate centrifugation, the wash liquid is applied evenly to the product cake; this liquid enters the centrifuge via the feed disk or the wash pipe.
Dry-centrifugation
After washing, centrifugation takes place – until the required residual moisture content in the filter cake is achieved.
Scraping, solids discharge
At reduced speed, the scraper knife swings into the filter cake and scrapes out the product vertically downward. If required, the residual heel removal on the scraper device can be switched on during scraping.
Residual heel removal
A residual heel is left on the filter cloth, to protect the cloth during scraping. The heel can be used to prevent fine content in the filtrate passing through the filter cloth during subsequent batches. The residual heel is removed after each batch, or periodically, to suit the specific application. The heel can be blown into the solids discharge using pressurised gas pulses applied via nozzles outside the basket or, if necessary, additionally via nozzles on the scraper device. If the process area is purged with inert gas, nitrogen is used for blowing off the heel.
Top discharge centrifuges
Simple but proven
The solid-liquid separation is effected discontinuously in a sequence of specific process steps. The individual process steps last from a few minutes to several hours depending on the characteristics of the product. Depending on the type of control system, the process can be automatic, semi-automatic or manual.
Filling
The suspension is applied evenly to the centrifuge basket via the feed pipe or optionally via the feed disk. The fill level control prevents overfilling of the basket.
Intermediate centrifugation
The basket accelerates to centrifuge the liquid from the surface of the cake.
Washing
After intermediate centrifugation, the wash liquid is applied evenly to the product cake; this liquid enters the centrifuge via the feed disk or the wash pipe.
Dry-centrifugation
After washing, centrifugation takes place - until the required residual moisture content in the filter cake is achieved.
Cake loosening device
The product can be released using a cake loosening device. Depending on the product, this will make subsequent discharge easier.
Top discharge
With top discharge centrifuges the product is discharged vertically upward. The solids can be discharged manually, optionally using a filter sack and lifting device or special suction device.
Pull Action Filter centrifuges
Discharged by pulling
The solid-liquid separation with the Pull Action Filter centrifuge is effected discontinuously in a sequence of specific process steps. The individual process steps last from a few minutes to several hours depending on the characteristics of the product. Depending on the type of control system, the process can be fully automatic, semi-automatic or manual.
Filling
The suspension is applied evenly to the centrifuge basket via the feed pipe or optionally via the feed disk. The fill level control prevents overfilling of the basket.
Intermediate centrifugation
The Pull Action Filter centrifuge accelerates to centrifuge the liquid from the surface of the cake.
Washing
After intermediate centrifugation, the wash liquid is applied evenly to the product cake; this liquid enters the centrifuge via the feed disk or the wash pipe.
Dry-centrifugation
After washing, centrifugation takes place - until the required residual moisture content in the filter cake is achieved.
Solids discharge
At reduced speed, sometimes at standstill, the pneumatically activated pull mechanism stretches the filter cloth downwards. This releases the product from the filter cloth, which then falls vertically downwards out of the centrifuge.
Gypsum centrifuges VGC
Gypsum dewatering
The gypsum dewatering is effected discontinuously in a sequence of specific process steps.
Filling
Before filling, the sorter mounted at the solids discharge cone is shifted to liquid discharge position. This prevents liquid reaching the next solids process step during gypsum dewatering. The gypsum suspension is applied evenly to the centrifuge basket via two feed pipes. The fill level control prevents overfilling of the basket.
Intermediate centrifugation
The basket is accelerated to partially dewater the cake.
Washing
After intermediate centrifugation, wash liquid is applied evenly to the product cake using the wash pipe. Impurities (mainly chlorides) are washed out.
Centrifugation
After washing, centrifugation takes place until the required gypsum dewatering, i.e. residual moisture content in the filter cake is achieved.
Scraping, solids discharge
Before scraping, the product sorter is shifted to solids discharge position. At reduced speed the scraper knife swings into the filter cake and scrapes out the product vertically downwards.
Residual heel removal
To protect the filter cloth during scraping, a residual heel is left on the filter cloth. Before residual heel removal, the product sorter is shifted to liquid discharge position. The residual heel can be removed periodically depending on the product characteristics by using a separate wash pipe.
MEG centrifuges
MEG Reclamation
The solid/liquid separation process for MEG recalamation using MEG Recovery centrifuges is discontinuous in a sequence of specific process steps. The following 2 options are available:
Filling
The MEG / NaCl / H2O suspension is applied evenly to the centrifuge basket via a feed pipe or an inclined feed and wash disk. The fill level control prevents overfilling of the basket.
Centrifugation
Centrifugation takes place until the required residual moisture of the filter cake is reached, usually at the max. possible basket speed.
Scraping, solids discharge
At reduced speed the scraper knife swings into the filter cake and scrapes out the product vertically downwards.
Residual heel removal
To protect the filter cloth during scraping, a residual heel is left on the filter cloth. The residual heel can be removed periodically by using a separate wash pipe or pneumatically using a residual heel removal system.
Brochures
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