Asynchronous technology and flywheel energy storage from Lindner

Published 24/11 at 16:43

Nestled at the edge of the Lower Oder Valley National Park, the Schwedt power plant, which belongs to EEW Energy from the Waste Group, supplies the local paper industry with electricity and process steam. In line with circular economy principles, the plant recovers paper mill, commercial and industry waste. To optimally prepare the waste for the fluidised bed boiler, the company relies on Lindner shredders.

Kraftwerk Schwedt GmbH & Co. KG has specialised in recovering energy from waste since 2010. Highly calorific SRF is produced from specially processed municipal solid, commercial and industrial waste. The power plant, in turn, generates electricity, heating and process steam which are used to supply Germany's third largest paper mill, whose waste is also used for energy recovery. The high demands placed on calorific value and throughput require powerful and energy efficient recycling machines. Therefore, in spring 2020, the Schwedt power plant decided to replace a stationary shredder that had synchronous technology and gearbox with Lindner’s ‘Polaris’ 2200 and its tried and tested asynchronous  technology. The Polaris performed much better, offered improved technical availability, mainly due to its drive concept, and led the company to replace another two shredders in 2021 with Lindner Polaris 2200.

At the Schwedt power plant, the shredders have been shredding 33t/h in a three shift operation a week since 2021. “We chose Lindner’s shredders based on the recommendation of another Lindner client and were not disappointed. The Polaris 2200 has an efficient cutting system and, after one year in full operation, has achieved a 30% higher productivity than machines with synchronous technology in the past,” says Steffen Künkel, production manager of post processing at the Schwedt power plant.

Generally speaking, the Polaris can be used for a variety of applications. Although the material delivered to the Schwedt power plant is predominantly free of FE parts, the input material might still contain unwanted and difficult to shred objects. The robust shear cutting system is, however, resistant to non shreddables, which in turn positively affects the throughput. In terms of output material, the Polaris can achieve three dimensional particle sizes from 40mm to 120mm in a single pass. For the Schwedt power plant’s fluidised bed kiln, it produces a particle size of 80mm. Commercial, industrial and waste wood used to fire calciners in cement plants is also shredded to the same size.

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