Patent ID: 6391266
Filing Date: 2002-05-21
Classification: B01D,C01F,C04B

Abstract:
A furnace in combination with a downstream flue gas desulfurization system in which lime is produced in the furnace for use in a downstream flue gas desulfurization process, said furnace being of a type in which flue gas including sulfur dioxide is produced from the combustion of sulfur-containing fuels; wherein:(a) said furnace comprises at least one first nozzle through which finely divided particles of limestone are injected into said furnace directly into the flue gas; said first nozzle positioned in close proximity to a first location within said furnace wherein the temperature of the flue gas passing therethrough approximately equals a minimum quicklime utilization/sulfation temperature of the flue gas and the temperature of the flue gas passing downstream thereof exceeds and remains above a minimum calcination temperature for a period sufficient to result in the calcination of a portion of said limestone injected through said nozzle to lime while limiting quicklime sulfation of the lime in said furnace; and (b) said lime produced in said furnace is utilized in said downstream flue gas desulfurization system to remove sulfur dioxide from said flue gas.