Patent ID: 6221325
Filing Date: 2001-04-24
Classification: B01D,Y10S

Abstract:
A process for removing sulfur dioxide from flue gases, the method comprising the steps of:delivering flue gases containing sulfur dioxide to a contactor region of an absorber;introducing into the absorber an ammonium sulfate scrubbing solution containing ammonia and having a concentration of ammonium sulfate above the saturation level of ammonium sulfate in the scrubbing solution so as to have suspended solids of ammonium sulfate precipitate, the scrubbing solution contacting the flue gases and absorbing sulfur dioxide from the flue gases;accumulating the scrubbing solution containing absorbed sulfur dioxide in a tank;oxidizing the scrubbing solution in the tank where the absorbed sulfur dioxide is reacted with oxygen and ammonia to produce ammonium sulfate and such that substantially all ammonium sulfite and ammonium bisulfite is eliminated from the scrubbing solution; andrecirculating the scrubbing solution to the contactor region.