Patent ID: 6912962
Filing Date: 2005-07-05
Classification: B01D

Abstract:
1. Apparatus for the cleaning of flue gases containing ash and sulfur dioxide produced by burning sulfur-containing coal in the combustion chamber of a circulating fluidized-bed firing system by the addition of air at a temperature of 700° to 950° C., the apparatus comprising: means for delivering a particulate SO a mixing unit; means for feeding a mixture comprising a portion of the ash, a portion of the reaction product, and a portion of the unreacted SO means for supplying water or an aqueous sodium-containing solution to the mixing unit, the water or aqueous sodium-containing solution mixing together with the mixture of ash, reaction product, and unreacted SO means for returning the ash, the reaction product, and the hydration product from the mixing unit into the combustion chamber; and means for regulating the reaction temperature of the mixing unit; wherein in the combustion chamber the hydration product is reactivated into an SO