Erdwich Zerkleinerungssysteme GmbH

More effective cement production: New sampling plant makes the determination of the quality of refuse derived fuel possible

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Source: Erdwich Zerkleinerungssysteme GmbH

Until now an employee had to manually remove RDF materials from the feed and bring it to the laboratory for shredding and reduction”, explained Peter Kraihamer who is responsible at Leube for maintenance, planning and safety. The problem with this was the following: “Every employee took different quantities of material in differing numbers and at differing times. Therefore it was not possible to assume any standard in the sampling, as it is meant to represent a cross section from a particular quantity of material.” In order to make it possible to carry out a precise analysis, Erdwich Zerkleinerungssysteme GmbH was charged with constructing a purpose built plant. “The requirements were extremely precise”, stated Andreas Ostermeier, project leader at Erdwich. “From each truckload of 90-100 m³ of RDF we were required to extract several samples of around 60 litres of material and reduce it to

component pieces of a size which could be analyzed in the laboratory”, continued Ostermeier. Additionally, a specified sampling quantity had to be prepared, representative of the entire truckload, which then should be delivered automatically by tube post to the laboratory. For that purpose, each of the 60 litres material samples, after they have been shredded, are mixed to a homogenous mass, and from this a sample of 0.5 litre is to be automatically extracted for the laboratory. This process cycle is repeated several times, so that precise conclusions can be drawn regarding the delivered RDF. Only in this way is it possible to precisely establish the calorific value and thus the optimization of the cement production costs.

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