Trocknung von Ersatzbrennstoffen

Translated title of the contribution: Drying of solid recovered fuels

Manuela Ruhri

Research output: ThesisMaster's Thesis


For the purpose of the sustainable use of resources, the production of solid recovered fuels from residual and industrial waste and from other non-hazardous waste, that is not usable for material recovery, has increased in recent years. These alternative fuels can be used in different co-incineration plants like the cement industry. In regard to the use of alternative fuels from residual and industrial waste in cement plants, the water content is an important quality criterion. The water content of solid recovered fuels amounts about 15% to 25%, depending on the composition and season. In order to increase the energy efficiency and the substitution rates, the water content can be reduced applying biological or thermal drying processes. Biological drying is based on the bacterial degradation of organic material under heat release of approximately 30-41 kJ/gC. Thermal drying can be realized in rotary drum dryers or fluidized bed dryers by supplying a drying gas. This thesis deals with the production and legal requirements of solid recovered fuels, as well as with different drying methods including examples of their application in practice. In the practical part of this Thesis, solid recovered fuels were sampled directly after their production and have been analyzed in a laboratory to the parameters calorific value, chlorine content and dry residue. After a ten-day biological drying in composting tunnels, a further sampling and analyses took place. By the evaluation of the results, the effect of biological drying processes on relevant physical and chemical parameters is determined. Furthermore, based on the results, a simplified energy balance for the drying process is carried out.
Translated title of the contributionDrying of solid recovered fuels
Original languageGerman
  • Adam, Josef, Co-Supervisor (internal)
  • Pomberger, Roland, Co-Supervisor (internal)
  • Sarc, Renato, Supervisor (internal)
Award date27 Jun 2014
Publication statusPublished - 2014

Bibliographical note

embargoed until 23-05-2017


  • Solid recovered fuels
  • water content
  • biological drying
  • thermal drying
  • calorific value
  • chlorine content
  • dry residue

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