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Effect of urea on fly ash PCDD/F concentrations in different particle sizes
P Ruokojärvi1, M Aatamila, K Tuppurainen
1Department of Environmental Sciences, University of Kuopio, Finland. paivi.ruokojarvi@uku.fi
Abstract:
The effect of urea as an inhibitor for reducing polychlorinated dibenzo-p-dioxin and dibenzofuran (PCDD/F) concentrations in flue gases was studied in a pilot scale plant, together with the effect on the particle size distribution of these compounds. Total PCDD/F concentrations decreased by a maximum of 74%, the decrease being greatest for the most highly (octa-) chlorinated isomers. The PCDD/F reduction affected all the particle size classes when an adequate amount of urea was used (1% of the fuel input), which indicates that inhibition, unlike formation, is independent of the fly ash particle size distribution.
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