Αρχική ΣελίδαΧάρτηςENGLISH

Εθνικό Μετσόβιο Πολυτεχνείο
Σχολή Μηχανολόγων Μηχανικών
Τομέας Πυρηνικής Τεχνολογίας

Fuel 85(16):2316-2322, 2006

Effects of biomass co-firing with coal on ash properties. Part II: Leaching, toxicity and radiological behaviour

P.Grammelis
Laboratory of Steam Boilers and Thermal Plants
Mechanical Engineering Department
National Technical University of Athens
Institute for Solid Fuels Technology and Applications
Centre for Research & Technology Hellas
G.Skodras
Institute for Solid Fuels Technology and Applications
Centre for Research & Technology Hellas
Laboratory of Solid Fuels and Environment
Chemical Process Engineering Research Institute
E. Kakaras
Laboratory of Steam Boilers and Thermal Plants
Mechanical Engineering Department
National Technical University of Athens
Institute for Solid Fuels Technology and Applications
Centre for Research & Technology Hellas
D.J. Karangelos, N.P. Petropoulos, E.P. Hinis, M.I. Anagnostakis and S.E.Simopoulos
Nuclear Engineering Section
Mechanical Engineering Department
National Technical University of Athens

In this paper, the leaching, toxicity behaviour and the radioactivity content of solid residues coming from the co-combustion of biomass with coal were studied. A variety of samples collected from semi-industrial scale tests were analysed for their leaching and toxicity properties. Natural radioactivity and radon exhalation rate were also measured in samples collected from tests performed in a pilot facility in Germany (IVD, University of Stuttgart) and large-scale power plants. The high toxicity levels detected in the ash samples of olive kernel could be attributed to the relatively increased concentrations of Zn, Ni, Mn, Co, Cd. The effect of biomass co-combustion on the radioactivity content of fly ash was dependent on the fuel mixture used as well as the ash sampling location along the flue gas pathway. Activity concentrations of most nuclides of interest, namely 238U, 226Ra, 210Pb and 232Th are comparable to those of fly ash produced when burning pure coal, while increased concentrations where observed for 40K. In some cases the artificial radionuclide 137Cs was also detected.

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