WATER RECOVERY AND ACID GAS CAPTURE FROM FLUE GAS

摘要

Methods for removing acid gases and recovering water from flue gas. A flue gas is introduced into a water spray tower and is cooled by direct contact with a sprayed aqueous stream to condense a portion of the water vapor in the flue gas. Acid gases present in the flue gas are absorbed into the aqueous mixture, and a chemical added to the stream facilitates conversion of absorbed acid gases. The aqueous stream leaving the spray tower is next treated to remove contaminants, such as carbonates and bicarbonates, thereby producing a cleaned aqueous stream that may be split into a stream that is cooled prior to reuse in the spray tower, as well as a stream that is fed back to the boiler.