| abstract |
Provided are: a desulfurization apparatus employing a limestone-gypsum method, which has excellent economic efficiency and does not undergo troubles that may be caused by flying particles; and an exhaust gas treatment system, whereby it becomes possible to collect high-purity carbon dioxide. The desulfurization apparatus is equipped with: a desulfurization unit for bringing an absorption solution containing a calcium compound into contact with an exhaust gas to remove a sulfur oxide from the exhaust gas; a removal unit for removing gypsum, which is generated from the sulfur oxide, from the absorption solution; and a washing unit for washing the exhaust gas, which has contacted with the adsorption solution, using the adsorption solution from which gypsum has been removed as a washing solution, thereby removing calcium-containing particles contained in the exhaust gas. In the removal unit, the gypsum is sorted into larger gypsum grains and smaller gypsum grains using a cyclone separator, the adsorption solution containing the larger gypsum grains is filtrated, and the resultant filtrate is supplied to the washing section. The exhaust gas treatment system is equipped with the desulfurization apparatus, a denitration apparatus and a carbon dioxide collection apparatus, wherein a portion of a collected gas that is discharged from the carbon dioxide collection apparatus is supplied to the removal unit in the desulfurization apparatus as an oxygen source. |