FUEL 88 |
| The present work focuses on the partitioning of trace elements in WtE boilers and the influence of firing different waste types. During a full-scale measuring campaign at a 22 MWth WtE plant, samples of bottom ash, fly ash, aerosols, deposits, and flue gas were taken while firing different waste types, or when changing the grate operational parameters (air distribution, oxygen content), respectively. The partitioning of elements in the WtE boiler was then determined on the basis of chemical analyses of the different samples, combined with a mass balance over the boiler. The results indicated that the partitioning of certain metals is influenced by the total content of Cl and S in the input waste; i.e. the partitioning of Pb seemed to shift towards increased vaporization with increasing Cl/S ratio in the input waste. Thermodynamic equilibrium calculations and laboratory scale release experiments are supporting the observed effects. |
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Mercury and Other Trace Elements in Fuel: Emissions and Control
8:30 AM-11:45 AM, Monday, April 7, 2008 Morial Convention Center -- Rm. 238, Oral
Division of Fuel Chemistry |