Reburn system with feedlot biomass
View Patent ↗The present invention pertains to the use of feedlot biomass as reburn fuel matter to reduce NO x emissions. According to one embodiment of the invention, feedlot biomass is used as the reburn fuel to reduce NO x . The invention also includes burners and boiler in which feedlot biomass serves a reburn fuel.
1. A method of reducing the amount of NO x resulting from the combustion of fuel comprising:
combusting a first fuel in a first combustion to produce air containing NO x ;
providing the air containing NO x to a second combustions;
combusting a reburn fuel in the second combustion;
wherein the reburn fuel includes at least 10% feedlot biomass in the form of a fine powder and coal; and
wherein the second combustion reduces the level of NO x in the air from the first combustion by at least 40%.
2. The method of claim 1 , wherein said reburn fuel contains less than approximately 45% ash.
3. The method of claim 1 , wherein said reburn fuel contains less than approximately 20% ash.
4. The method of claim 1 , wherein said first fuel is coal or natural gas.
5. The method of claim 1 , wherein said feedlot biomass includes manure from at least one animal of the group consisting of: beef, swine, horses and poultry.
6. The method of claim 1 , wherein the first and second fuels are combusted in a boiler burner.
7. The method of claim 1 , wherein said first fuel is combusted in at least one first burner and said second fuel is combusted in a second burner, wherein said first and second burner are part of a multiple-burner boiler unit.
8. The method of claim 1 , wherein said reburn fuel contains at least 90% feedlot biomass.
9. The method of claim 1 , wherein said reburn fuel contains at least 50% feedlot biomass.
10. The boiler unit of claim 1 , wherein said reburn fuel contains at least 90% feedlot biomass.
11. The boiler unit of claim 1 , wherein said reburn fuel contains at least 50% feedlot biomass.
12. A boiler burner for combustion of fuel comprising:
a blower to direct air flow;
a first burner, wherein the first burner produces gases containing NO x ;
an injection point for a reburn fuel; and
an exhaust;
wherein the blower directs gases containing NO x from the first burner to flow past the injection point for the reburn fuel to the exhaust;
wherein said reburn fuel includes at least 10% feedlot biomass in the form of a fine powder and coal; and
wherein the level of NO x in gasses leaving the exhaust contains at least 40% less NO x than gasses produced by the first burner.
13. The boiler burner of claim 12 , wherein the reburn fuel contains less than approximately 45% ash.
14. The boiler burner of claim 12 , wherein the reburn fuel contains less than approximately 20% ash.
15. The burner boiler of claim 12 , wherein said reburn fuel contains at least 90% feedlot biomass.
16. The burner boiler of claim 12 , wherein said reburn fuel contains at least 50% feedlot biomass.
17. A multiple-burner boiler unit for combustion comprising:
a furnace containing furnace gases;
at least one first burner, wherein the first burner combusts a first fuel and produces furnace gasses containing NO x ;
at least one second burner, wherein the second burner combusts a reburn fuel and reduces NO x in the furnace gasses produced by the first burner by at least 40%,
wherein said reburn fuel includes at least 10% feedlot biomass in the form of a fine powder and coal.
18. The boiler unit of claim 17 , where the reburn fuel contains less than approximately 45% ash.
19. The boiler unit of claim 17 , wherein the reburn fuel contains less than approximately 20% ash.
20. The boiler unit of claim 17 , wherein said first fuel is coal or natural gas.