Austrian recycling equipment manufacturer, Lindner Recyclingtech, has launched two new shredders aimed at the Refuse Derived Fuel (RDF) market, the Polaris 2200 and 2800.
The new models are single-shaft shredders which Lindner said that have been optimised for the cost-efficient, single-step shredding of untreated household refuse as well as industrial and commercial waste.
The company said that a typical application area is the processing of waste derived fuels used instead of fossil fuels in calciners of cement factories or in thermal power plants.
Because the Polaris shredders run at a particularly low speed and with correspondingly high torque, the manufacturer said that their knives cut the input material with high power, as required by the single-step process.
The 2200 has a feed opening of 4090 x 3000 mm and a rotor length of 2115 mm, and shreds up to 22 tonnes of commercial and industrial waste per hour.
The Polaris 2800, with a feed opening of 4779 x 2370 mm and a rotor length of 2805 mm, achieves a volume of up to 32 tonnes per hour.
Depending on the choice of screens, the final grain sizes are between 50 mm and 120 mm. According to Lindner, with its cutting principle and automated pusher system control, its single-shaft shredder technology ensures constant output with uniform grain size.
The units feature asynchronous motors with nominal outputs of 200 kW (Type 2200) and 2x 132 kW (Type 2800) and a two-step belt drive.
If non-shreddable extraneous material turns up, the integrated sliding clutch brings the machine to a standstill.
The large hydraulic maintenance flap and doors offer convenient access, for example to replace the six or eight easy-to-handle screen modules or to rotate the knives that can be used on four sides.
Optimised for RDF
With the development of the Polaris single-shaft shredder, Lindner said that it is supporting the trend towards the optimum processing of RDF to ensure that it is coordinated to the scheduled application.
"When processing waste into RDF, high throughput and low shredding costs per tonne are even more important than in other industrial processes,” explained Stefan Scheiflinger, product manager at Lindner Recyclingtech.
“This applies especially to the processing of refuse-derived fuels for use in a calciner. At the same time, the system must be able to shred untreated and in some cases bulky waste in a single process step to grain sizes of 80 mm and less,” he continued.
This makes particularly high demands on the design of the shredder deployed for this job. With the new Polaris, we comply precisely with these demands. It is proving in practice to be an energy-efficient system that functions reliably and, if necessary, is easily accessible for cleaning and maintenance work and thus enables consistently high productivity," concluded Scheiflinger.
Depending on the input material, the relatively coarse shredded material produced by the new Polaris shredders is said to have an average calorific value of 15 to 18 MJ per kg, and is thus ideal for the calciner.
In comparison, the use of RDF as a secondary fuel in the main combustion chamber of cement factories, where temperatures of up to 2000 °C can be reached, has different demands on the properties of the RDF.
Here, Lindner said that its two-step systems from are still the first choice. Consisting of a Jupiter pre-shredder, a separating unit and a Komet post-shredder, they produce an optimum shredded material with a defined grain size of less than 35 mm.
Austrian waste disposal company, KAB Kärntner Abfallbewirtschaftung, which operates equipment for the production of RDF of the highest technical standard, was one of the first processors to gain practical experience with the new Polaris.
"Our company wanted to take advantage of the economic advantages of the single-step shredding technology,” commented Says Managing Director Werner Bleiberger:
“In the search for a modern, high-performance system, our attention was drawn to Lindner. They loaned us a first prototype of the Polaris to test for around a year. Over this period, the system proved its efficiency, reliability, low maintenance and maintenance friendliness very impressively indeed," he concluded.
A video of the new machines in action can be viewed below.
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