| 摘要 |
Procedure for the cleaning of flue gases containing sulfur dioxide that come from a circulating fluidized-bed firing system, wherein within the combustion chamb er of the fluidized-bed firing system sulfur-containing coal is burned by the addition of air at a temperature of 700 to 950 .degree.C in a fluidized bed, and therein flue gas containing sulfur dioxide is formed and a particulate SO2 sorbent is delivered to the combusti on chamber, a portion of the ash produced in the combustion and a portion of the reactio n product produced in the reaction of the SO2 sorbent with the sulfur dioxide as well as a portion of the unreacted SO2 sorbent is carried off from the combustion chamber and is fed to a mixing unit, in the mixing unit, water or an aqueous sodium-containing solution is fed to the ash, the reaction product, and the unreacted SO2 sorbent and is mixed together with this, and therein the unreacted SO2 sorbent is converted into a hydration product at a reaction temperature of 60.degree. to 100.degree. and at atmospheric pressure, the ash together with the reaction product and the hydration product from th e mixing unit is returned into the combustion chamber of the fluidized-bed firing system, and the hydration product is reactivated to an SO2 sorbent at a combustion- chamber temperature of700.degree. to 950.degree. C, as well as an apparatus for the execution of this procedure (Figure 1).
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