A method for reducing the pcdd - and / or pcdf - concentration in exhaust gases

摘要

The invention concerns a method of reducing the concentration of PCDD and PCDF (polychlorinated dibenzodioxins and polychlorinated dibenzofurans) in the flow of waste gases from a sintering plant, in particular an iron-ore sintering plant. The invention is characterized in that the initial PCDD/PCDF concentration in the waste gas is reduced adsorptively, preferably to approximately 1/10, and the PCDD/PCDF concentration of the pre-purified waste gas is then reduced by catalytic conversion to a value below the legal limit. The dioxin- and/or furan-charged adsorbent can be separated in an electrostatic filter and fed back to the sintering process.