METHOD OF PURIFYING FLUE GASES CONTAINING HIGH CONCENTRATIONS OF MERCURY.

摘要

The method proposed for the purification of flue gases containing high concentrations of mercury, in particular flue gases from sewage-sludge incineration plants, comprises a preliminary purification stage in which a solid adsorbant in the form of finely particulate activated charcoal, activated coke, furnace coke or molecular sieves is blown into the gas stream and the impurity-coated adsorbant subsequently removed by means of a fabric filter, followed by the customary wet-desulphurization of the flue gases and precipitation of the gypsum in the gases. Preferably, 90 % of the flue dust is removed by a dust-removal unit before this preliminary purification stage.