Patent ID: 8092582

Claim:
A wet-type exhaust gas desulfurizer comprising: a vertical cylindrical absorption tower in which an exhaust gas emitted from a combustion apparatus is introduced, and an absorption liquid containing a slurry including limestone or lime is sprayed into the exhaust gas from a plurality of spray nozzles of spray headers provided in multiple stages along a direction of an exhaust gas flow to absorb and remove soot and dust contained in the exhaust gas, a sulfur oxide, and substances caused by components included in a fuel used in the combustion apparatus, the spray nozzles being provided in a grid form; and an absorption liquid trapping section provided in a lower portion of the absorption tower, wherein the plurality of spray nozzles provided in each spray header are annular spray-type (hollow cone type) spray nozzles, which spray the absorption liquid radially at spray angles of 50 degrees to 80 degrees with a direction counter to an exhaust gas flow as a center in a neighborhood of an absorption tower wall, and in a central part of the absorption tower, radially at spray angles of 80 degrees to 130 degrees with a direction counter to the exhaust gas flow as a center.