FLUE GAS DESULFURIZER AND METHOD THEREOF

摘要

PROBLEM TO BE SOLVED: To provide the structure of a circulating tank which is improved to uniformly fluidize limestone in a desulfurizing method using granulated limestone. SOLUTION: An in-column weir 17 is installed in the lower part of a circulating tank 6 to collect a liquid absorbent to a central part (oxidizing area 7) and to make it fall, and air is blown there from an air blowing pipe 8 to oxidize sulfurous acid in the liquid absorbent. The liquid is sent to a neutralizing area 15 holding granulated limestone in the inner peripheral part of the circulating tank 6 from the bottom part thereof to fluidize the granulated limestone and to react the liquid with the limestone to finally form gypsum. When oxidizing air is fed from below the oxidizing area 7, the liquid is agitated by the rising of foam to uniformly oxidize it and to eliminate the need of installing an agitator for agitating the liquid. Thus the need of installing an agitator in the circulating tank 6 is eliminated leading to a reduction in power.