Method and system for reducing nitrogen oxides and carbon loss from carbonaceous fuel combustion flue emissions
AssigneeThe Penn State Research Foundation
InventorSarma V. Pisupati
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Abstract
There is provided methods and systems for the reduction of nitrogen oxides and carbon loss from carbonaceous fuel combustion flue emissions. The preferred carbonaceous fuel is coal. The invention provides methods and systems comprising the use of coal as a reburn fuel for coal combustion systems. The invention comprises low temperature pyrolysis producing gaseous hydrocarbons for the reduction of nitrogen oxides and treatment of char with resulting reduction of carbon loss.
Claims28
A method for the reduction of nitrogen oxides and carbon loss from carbonaceous fuel combustion flue emissions of a combustion furnace comprising:
- pyrolyzing or thermally decomposing a first portion of said carbonaceous fuel to produce a first gaseous stream and a char fraction;
- adding said char fraction to the main burner of said combustion furnace;
- adding said first gaseous stream to the main combustion chamber of said combustion furnace;
- adding a second portion of said carbonaceous fuel to said main burner of said combustion furnace;
- and combusting said second portion of said carbonaceous fuel, said char, and said first gaseous stream in the main burner of said combustion furnace to produce a second gaseous stream.
The method of claim1, wherein said pyrolyzing is at a temperature from about 600° C. to about 700° C.
The method of claim1, wherein said carbonaceous fuel is coal and said second portion is in an amount from about 50 wt % to about 85 wt % of the total weight of said coal.
A combustion furnace system for reduction of nitrogen oxides and carbon loss from carbonaceous fuel combustion flue emissions comprising:
- means for pyrolyzing or thermally decomposing a first portion of said carbonaceous fuel to produce a first gaseous stream and a char fraction;
- means for combusting a second portion of said carbonaceous fuel;
- means for adding said char fraction to said second portion of said carbonaceous fuel;
- means for adding said first gaseous stream to said means for combusting said second portion of said carbonaceous fuel.
Dependencies are inferred from the claim text.