Patent ID: 6203598
Filing Date: 2001-03-20
Classification: B01D

Abstract:
A flue gas treating process for the treatment of flue gas containing at least SO.sub.2 and SO.sub.3 which includes a heat recovery step for recovering heat from the flue gas by means of a heat exchanger and thereby cooling the flue gas, and a subsequent absorption step for bringing the flue gas into gas-liquid contact with an absorbing fluid in an absorption tower so as to remove at least SO.sub.2 present in the flue gas by absorption into the absorbing fluid, whereina powder addition step for spraying a powder of coal ash collectable in said absorption step into the flue gas is provided prior to said heat recovery step,said powder is sprayed into the flue gas in the form of a slurry comprising said powder suspended in a liquid, andthe absorbing fluid having undergone gas-liquid contact with the flue gas in said absorption step is sprayed into the flue gas as said slurry so that the solid matter present in the absorbing fluid may be used as said powder.