Vertical peeler centrifuges

V 800 – 1600 BG


Bild1 Bild2 Bild3
Worldwide, FDG gypsum is dehydrated in many power stations by HEINKEL Centrifuges. The wide variety on offer of gypsum centrifuges with different sizes allows optimum adaption to changing product characteristics and throughput rates.

Filling the basket

The suspension to be separated is filled into the vertically mounted perforated basket at pre-selected loading speed. Under the effect of the centrifugal force, the solid particles settle on the filter fabric on the basket shell.

The solids are retained by the filter fabric, suspension fluid flows through the forming filter cake including the filter fabric, and leaves the perforated basket through bore-holes in the basket sleeve.

During filling, the fluid level in the basket and the growth of the filter cake are controlled by sensors. Upon reaching the desired filter cake height the filling process is stopped automatically.

Intermediate spin



Depending on the product, a filling process will be interrupted by intermediate centrifuging with increased speed, in order to free filling volume in the basket and continue the filling process.

Depending on the filtration reaction of the product, intermediate centrifuging will be repeated several times.

Washing the solids

As soon as the suspension fluid has been centrifuged, the process step for washing the solids in the basket is started. For this purpose, washing fluid is evenly distributed via a suitable washing pipe (nozzle pipe or orifice-type sprayer) throughout the whole height of the basket.

Under the effect of the centrifugal force, the washing fluid penetrates the filter cake, displaces the still sticking suspension fluid and leaves the basket in the same way as the suspension fluid during filling. Washing can be carried out at the same or higher speed than the filling process.

Final spin

In order to separate the fluid from the filter cake the basket is generally accelerated to the maximum allowable speed and kept constant at this speed.

Kinetics of the hydro-extraction process depend on the solids and fluid parameters, the height of the filter cake and, naturally, the centrifugal force acting upon the fluid to be separated.

The residual humidity in the filter cake decreases over time under the constantly acting centrifugal force and approaches asymptotically a theoretical limit.

Discharge

After hydro-extraction, the basket is run at the desired speed. The filter cake is then at this speed discharged from the basket by means of a discharge device.

This is done by moving in a short peeling knife horizontally below the basket rim into the filter cake up close to the filter medium. Then, the peeling knife is slowly moved downwards, during which it removes the filter cake except for a residual layer.

The scraper speed must be selected such that the solids can fall freely through the opening in the basket floor into a hopper below the centrifuge.


Cleaning in place (CIP)

Cleaning of the interior of the centrifuge is often required after every cycle or several cycles, in order to ensure a defined product separation between two following batches, or, for example, in order to prevent an infection.

The inside of the centrifuge with all built-in devices can be cleaned automatically with an integrated CIP cleaning system without the need to open the centrifuge.



Fields of application Vertical peeler centrifuges
V 800 – 1600 BG


Pharmaceutical
Chemistry
Fine chemicals
Cosmetics
Recycling
Metal
Food products
Surface coating