Patent ID: 8807055

Claim:
A process for controlling combustion system emissions from combustion systems in which a carbonaceous-fuel is combusted, said process comprising the steps of: introducing a carbonaceous fuel and air into a furnace to provide a combustible fuel/air mixture and combusting the fuel/air mixture at a furnace combustion region to provide combustion products in the form of flue gases containing pollutant compounds including SO x , Hg, As, and CO 2 , wherein the temperature within the furnace combustion region is from about 2500° F. to about 3000° F.; introducing into the furnace combustion region a calcium-containing reagent to expose the calcium-containing reagent to the furnace combustion region temperature to thereby calcine the calcium-containing reagent within the furnace combustion region into a plurality of calcium oxide particles to provide a scavenging agent in particulate form for scavenging combustion product components, wherein the calcium oxide particles are in the form of a plurality of discrete, substantially non-agglomerated calcium oxide particles having a particle size of less than about 3 microns; contacting the calcium oxide particles with the combustion products to react the calcium oxide particles with pollutants contained in the combustion products to capture SO x and toxic metals that are present in the combustion products; and transporting the flue gases and particles from the combustion region and through the furnace to a furnace exit.