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Andritz starts up new dewatering technology at Zellstoff Pöls

Austria-headed international technology group Andritz AG has announced that it has successfully started up the latest innovation in dewatering – the Vertical Screw Thickener (VST) – at Zellstoff Pöls AG, Austria. The VST has been operating successfully since the beginning of December 2018 and supplying the existing MG paper production line PM2 with a maximum capacity of 360 tonnes per day.

Andritz Vertical Screw Thickener (VST) manufactured in Graz, Austria (photo courtesy Andritz).
Andritz Vertical Screw Thickener (VST) manufactured in Graz, Austria (photo courtesy Andritz).

According to a statement, the pioneering Vertical Screw Thickener is a screw press with a vertical configuration and a very small footprint, making it suitable for retrofit installations in existing buildings. The pulp suspension is fed into the top of the machine, and its downward transport is gravity-assisted.

At Zellstoff Pöls, the VST is located just before the finished pulp storage tank that feeds the paper production line and thus enables separation of the pulp mill and paper machine water loops.

Our expectations of the new Vertical Screw Thickener were more than fulfilled. After the fast and trouble-free start-up, we are now already seeing the positive effects, like a reduction of sizing agent consumption, said Jürgen Rieger, Chief Operations Manager at Zellstoff Pöls.

The VST dewaters the pulp suspension from 3 percent inlet to 25-30 percent outlet consistency, and the water removed is recycled and re-used in the pulp mill. The ability to dewater from low-consistency inlet to high-consistency discharge is an important advantage compared to conventional dewatering equipment.

Paper machine water is added to the dilution conveyor after the VST. Separation of the water loops results in savings in paper additives (e.g. sizing agent) at the paper machine. The VST replaces an existing gravity table at Zellstoff Pöls and feeds the MG paper production line for PM2.

The results of our previous tests in the ANDRITZ Stock Preparation Pilot Plant were perfectly implemented in our mill-site production process with the VST 1005, said Patrick Wohlmuth, Process Technology Manager at Zellstoff Pöls.

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