Patent ID: 7524471
Filing Date: 2009-04-28
Classification: B01D,F23J

Abstract:
1. A process for treating a flue gas stream produced by combustion of coal, to reduce a content of mercury in the flue gas stream, the process comprising: subjecting the flue gas stream to a particulate collector; thereafter subjecting the flue gas stream to a first wet scrubbing process for reducing a concentration of sulfur oxides therein through contact of the flue gas stream with an aqueous calcium-based slurry to form sulfate and sulfite salts and produce a flue gas stream having a reduced sulfur oxide content; thereafter passing the flue gas stream through a mist eliminator to remove moisture from the flue gas stream; and thereafter subjecting the flue gas stream to a second wet scrubbing process having an aqueous acidic scrubbing solution comprising hydrogen peroxide to produce a flue gas having a reduced mercury content.