Method of desulfurization of flue gases

Details Method of desulfurization of flue gases Method of desulfurization of flue gases

B - Operations, Transporting

01

D

23/349

B01D 53/14 (2006.01) B01D 53/50 (2006.01)

Patent

CA 1208888

Method of Desulfurization of Flue Gases ABSTRACT OF THE DISCLOSURE Preliminarily cooled flue gases from which particulates and sulfur trioxide have been removed are contacted with an SO2 absorbing liquid and the SO2 laden liquid is then regenerated by multi-stage vacuum stripping and returned in a closed cycle to the absorber. The absorbing liquid contains an additive and is a dilute solution of, preferably, calcium ions in water. The additive is added in minor amount sufficient to pro- vide a partial pressure of SO2 in the absorber equivalent to the partial pressure of SO2 in water in the tempera- ture range of about 15°C to -20°C. The preliminarily cooled gas is at a temperature in the order of 125°F. The heat removed from the closed cycle by vacuum strip- ping is substantially equal to the heat given up by the flue gas in the absorber, and the temperature difference between the liquid on entering and leaving the desorber is in the order of 10-30°F.

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