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CPOTE2020 logo
6th International Conference on
Contemporary Problems of Thermal Engineering
Online | 21-24 September 2020

Abstract CPOTE2020-1174-A

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Fly ash composition and properties from co-firing refuse-derived fuel (RDF) and hard coal in a multifuel unit

Agata MLONKA-MĘDRALA, AGH University of Science and Technology, Poland
Tadeusz DZIOK, AGH University of Science and Technology, Poland
Aneta MAGDZIARZ, AGH University of Science and Technology, Poland
Wojciech NOWAK, AGH University of Science and Technology, Poland

The Waste Framework Directive - Directive 2008/98/EC on waste, sets the basic rules and strategies on waste management, one of these is waste management hierarchy which places recycling and waste thermal processing before landfilling in waste processing scheme. Therefore, all non-recyclable wastes, which are suitable for thermal conversion should be used in energy recovery processes e.g. combustion or pyrolysis. Wastes characterized by high calorific value and low moisture are used for alternative fuel production. In Poland, Refuse Derived Fuel (RDF) potential is significant, but high heterogeneity and contamination of the fuel limit its direct use in power industry. Units dedicated to RDF firing and co-firing are under the same environmental regulations as other waste incineration plants. The combustion technology and flue gas treatment systems are much more challenging and complex in comparison to classic coal-firing units. In the work several samples were collected from a real-scale multifuel unit co-firing RDF with hard coal. A complex analysis of raw fuel (both RDF and hard coal) and fly ashes collected before and after FGT (Flue Gas Treatment) system was performed. The thermal behaviour characteristics, transformation properties of the inorganic components and ash fusion temperatures of fly ashes were investigated using X-ray diffraction (XRD) and high-temperature microscope. To determine the influence of flue gas treatment installations on the ash structure, Scanning Electron Microscopy with Energy Dispersive Spectroscopy (SEM-EDS) photographs were taken. The mass balance of mercury was performed for the analysed unit.

Keywords: Refuse-derived fuel, Combustion, Fly ash, Waste incineration, Heavy metals
Acknowledgment: This work was supported by Polish Ministry of Science and Higher Education [grant AGH no].