Method and additive for controlling nitrogen oxide emissions
View Patent ↗The present disclosure is directed to an additive mixture and method for controlling nitrogen oxide(s) by adding the additive mixture to a feed material prior to combustion.
1. A composition, comprising:
coal particles; and
an additive composition to react with a contaminant from combustion of the coal particles, the additive composition comprising;
a nitrogenous material comprising one or more of ammonia, an amine, an amide, cyanuric acid, a nitride, and urea;
a binder; and
a thermal stability agent comprising one or more of a metal hydroxide, metal carbonate, and metal bicarbonate,
wherein the thermal stability agent is bound by the binder to and substantially surrounds the nitrogenous material and wherein a molar ratio of the thermal stability agent:nitrogenous material ranges from about 1:1 to about 10:1.
2. The composition of claim 1 , wherein the coal is a high alkali coal, wherein the composition is fed to a combustor, wherein the coal particles and additive composition are mixed together, wherein a molar ratio of the thermal stability agent:nitrogenous material ranges from about 1:1 to about 8:1, wherein the thermal stability agent forms, when the composition is combusted, one or more of a thermally protective barrier and heat sink around the nitrogenous material to reduce thermal degradation of the nitrogenous material, wherein the binder is one or more of a wax, wax derivative, gum, gum derivative, and alkaline binding agent, and wherein the nitrogenous material is one or more of an amine, amide, cyanuric acid, and urea.
3. The composition of claim 1 , wherein the coal is a high iron coal, wherein the composition is fed to a combustor, wherein the coal particles and additive composition are mixed together, wherein a molar ratio of the thermal stability agent:nitrogenous material ranges from about 1:1 to about 8:1, wherein the thermal stability agent forms, when the composition is combusted, one or more of a thermally protective barrier and heat sink around the nitrogenous material to reduce thermal degradation of the nitrogenous material, wherein the binder is one or more of a wax, wax derivative, gum, gum derivative, and alkaline binding agent, and wherein the nitrogenous material is one or more of an amine, amide, cyanuric acid, and urea.
4. The composition of claim 1 , wherein the coal is a high sulfur coal, wherein the composition is fed to a combustor, wherein the coal particles and additive composition are mixed together, wherein a molar ratio of the thermal stability agent:nitrogenous material ranges from about 1:1 to about 8:1, wherein the thermal stability agent forms, when the composition is combusted, one or more of a thermally protective barrier and heat sink around the nitrogenous material to reduce thermal degradation of the nitrogenous material, wherein the binder is one or more of a wax, wax derivative, gum, gum derivative, and alkaline binding agent, and wherein the nitrogenous material is one or more of an amine, amide, cyanuric acid, and urea.
5. The composition of claim 1 , wherein a weight ratio of the thermal stability agent:nitrogenous material ranges from about 0.5:1 to about 8:1, wherein the nitrogenous material comprises urea, wherein an iron content of the coal is less than about 10 wt. % (dry basis of the ash) as Fe 2 O 3 , wherein an alkali content of the coal is at least about 20 wt. % (dry basis of the ash) alkali, wherein the thermal stability agent forms, when the composition is combusted, one or more of a thermally protective barrier and heat sink around the nitrogenous material to reduce thermal degradation of the nitrogenous material, wherein the binder is one or more of a wax, wax derivative, gum, gum derivative, and alkaline binding agent, and wherein the thermal stability agent comprises one or more of an alkaline earth metal hydroxide, an alkaline earth metal carbonate, and an alkaline earth metal bicarbonate.
6. The composition of claim 1 , wherein a weight ratio of the thermal stability agent:nitrogenous material ranges from about 0.5:1 to about 8:1, wherein the coal comprises at least about 15 wt. % calcium as CaO (dry basis of the ash), wherein the thermal stability agent forms, when the composition is combusted, one or more of a thermally protective barrier and heat sink around the nitrogenous material to reduce thermal degradation of the nitrogenous material, wherein the nitrogenous material comprises urea, wherein the binder is one or more of a wax, wax derivative, gum, gum derivative, and alkaline binding agent, and wherein the thermal stability agent comprises one or more of an alkaline earth metal hydroxide and an alkaline earth metal carbonate.
7. The composition of claim 1 , wherein a weight ratio of the thermal stability agent:nitrogenous material ranges from about 0.5:1 to about 8:1, wherein the thermal stability agent forms, when the composition is combusted, one or more of a thermally protective barrier and heat sink around the nitrogenous material to reduce thermal degradation of the nitrogenous material, wherein the binder is one or more of a wax, wax derivative, gum, gum derivative, and alkaline binding agent, and further comprising one or more of a stabilizing agent and dispersant.
8. The composition of claim 1 , wherein a weight ratio of the thermal stability agent:nitrogenous material ranges from about 0.5:1 to about 8:1, wherein the thermal stability agent forms, when the composition is combusted, one or more of a thermally protective barrier and heat sink around the nitrogenous material to reduce thermal degradation of the nitrogenous material, wherein the binder is one or more of a wax, wax derivative, gum, gum derivative, and alkaline binding agent, and wherein the additive mixture comprises prills comprising urea and an alkaline earth metal hydroxide.
9. The composition of claim 1 , wherein a molar ratio of the thermal stability agent:nitrogenous material ranges from about 1.5:1 to about 5:1, wherein the thermal stability agent forms, when the composition is combusted, one or more of a thermally protective barrier and heat sink around the nitrogenous material to reduce thermal degradation of the nitrogenous material, and wherein the binder is one or more of a wax, wax derivative, gum, gum derivative, and alkaline binding agent, and further comprising at least one halogen.
10. The composition of claim 9 , wherein the at least one halogen is one or more of iodine and bromine.
11. A composition, comprising:
coal particles; and
an additive composition to react with a contaminant from combustion of the coal particles, the additive composition comprising:
a nitrogenous material in the form of particles comprising one or more of ammonia, an amine, an amide, cyanuric acid, a nitride, and urea, wherein the nitrogenous material particles have an exterior surface; and
a thermal stability agent bound to and substantially surrounding the exterior surface of the nitrogenous material particles to reduce thermal decomposition of the nitrogenous material, wherein the thermal stability agent comprises one or more of a metal hydroxide, metal carbonate, and metal bicarbonate and wherein a weight ratio of the thermal stability agent:nitrogenous material ranges from about 0.5:1 to about 8:1.
12. The composition of claim 11 , wherein a weight ratio of the thermal stability agent:nitrogenous material ranges from about 1:1 to about 4:1, wherein the thermal stability agent is in contact with some, but not all of the exterior surface of the nitrogenous material particles, wherein the thermal stability agent forms, when the composition is combusted, one or more of a thermally protective barrier and heat sink around the nitrogenous material to reduce thermal degradation of the nitrogenous material, and wherein the thermal stability agent comprises ash.
13. The composition of claim 11 , wherein a molar ratio of the thermal stability agent:nitrogenous material ranges from about 1:1 to about 10:1, wherein the thermal stability agent in contact with the exterior surface of the nitrogenous material particles thermally protects the nitrogenous material from one or more of combustion and thermal breakdown, wherein the thermal stability agent forms, when the composition is combusted, one or more of a thermally protective barrier and heat sink around the nitrogenous material to reduce thermal degradation of the nitrogenous material, and wherein the thermal stability agent comprises one or more of a metal hydroxide, metal carbonate, metal bicarbonate, and ash.
14. The composition of claim 11 , wherein a molar ratio of the thermal stability agent:nitrogenous material ranges from about 1:1 to about 8:1, wherein the thermal stability agent in contact with the exterior surface of the nitrogenous material particles is a heat sink, wherein the thermal stability agent forms, when the composition is combusted, one or more of a thermally protective barrier and heat sink around the nitrogenous material to reduce thermal degradation of the nitrogenous material, and wherein the thermal stability agent comprises one or more of a metal hydroxide, metal carbonate, metal bicarbonate, and ash.
15. The composition of claim 11 , wherein a molar ratio of the thermal stability agent:nitrogenous material ranges from about 1:1 to about 10:1 and wherein the nitrogenous material particulates further comprise a substrate and wherein the substrate is a porous matrix comprising one or more of zeolite, char, graphite, and ash.
16. The composition of claim 15 , wherein the composition is fed to a combustor, wherein the coal particles and additive composition are mixed together, and wherein the substrate is one or more of flyash and bottom ash.
17. The composition of claim 16 , wherein the substrate comprises from about 10 to about 90 wt % of the additive composition and wherein a molar ratio of the thermal stability agent:nitrogenous material ranges from about 1:1 to about 10:1.
18. The composition of claim 11 , wherein a molar ratio of the thermal stability agent:nitrogenous material ranges from about 1.5:1 to about 5:1, wherein the composition is fed to a combustor, wherein the coal particles and additive composition are mixed together, and further comprising a binder, wherein the binder binds the thermal stability agent to the nitrogenous material.
19. The composition of claim 18 , wherein the binder is one or more of a wax, wax derivative, gum, gum derivative, and alkaline binding agent.
20. The composition of claim 19 , wherein the alkaline binding agent comprises one or more of an alkali hydroxide, alkali carbonate, alkali bicarbonate, lime, limestone, caustic soda, trona, alkaline earth metal hydroxide, alkaline earth metal carbonate, and alkaline earth bicarbonate.
21. The composition of claim 18 , wherein the binder comprises from about 0 to about 5 wt % of the additive composition and wherein a molar ratio of the thermal stability agent:nitrogenous material ranges from about 1:1 to about 10:1.
22. The composition of claim 11 , wherein a molar ratio of the thermal stability agent:nitrogenous material ranges from about 1:1 to about 10:1 and wherein the composition is in the form of one or more of a slurry and sludge and wherein the thermal stability agent comprises one or more of a metal hydroxide, metal carbonate, metal bicarbonate, metal hydrate, and metal nitride.
23. The composition of claim 11 , wherein a weight ratio of the thermal stability agent:nitrogenous material ranges from about 1:1 to about 4:1, wherein the composition comprises solid particles, wherein the particles have a moisture level, wherein the thermal stability agent forms, when the composition is combusted, one or more of a thermally protective barrier and heat sink around the nitrogenous material to reduce thermal degradation of the nitrogenous material, wherein a molar ratio of the thermal stability agent:nitrogenous material ranges from about 1:1 to about 10:1, and wherein the thermal stability agent comprises one or more of a metal hydroxide, metal carbonate, metal bicarbonate, metal hydrate, and metal nitride.
24. The composition of claim 11 , wherein a molar ratio of the thermal stability agent:nitrogenous material ranges from about 1:1 to about 10:1, wherein the thermal stability agent forms, when the composition is combusted, one or more of a thermally protective barrier and heat sink around the nitrogenous material to reduce thermal degradation of the nitrogenous material and wherein the thermal stability agent comprises one or more of a metal hydroxide, metal carbonate, and metal bicarbonate.
25. The composition of claim 11 , wherein a molar ratio of the thermal stability agent:nitrogenous material ranges from about 1:1 to about 10:1, wherein the thermal stability agent forms, when the composition is combusted, one or more of a thermally protective barrier and heat sink around the nitrogenous material to reduce thermal degradation of the nitrogenous material, and further comprising coal, wherein the coal is one or more of a high alkali coal, a high iron coal, and a high sulfur coal.
26. The composition of claim 11 , wherein a molar ratio of the thermal stability agent:nitrogenous material ranges from about 1:1 to about 10:1, wherein the thermal stability agent forms, when the composition is combusted, one or more of a thermally protective barrier and heat sink around the nitrogenous material to reduce thermal degradation of the nitrogenous material, and wherein the thermal stability agent comprises one or more of an alkaline earth metal hydroxide, an alkaline earth metal carbonate, and an alkaline earth metal bicarbonate.
27. The composition of claim 11 , wherein a molar ratio of the thermal stability agent:nitrogenous material ranges from about 1:1 to about 10:1, wherein the thermal stability agent forms, when the composition is combusted, one or more of a thermally protective barrier and heat sink around the nitrogenous material to reduce thermal degradation of the nitrogenous material, and further comprising one or more of a stabilizing agent, dispersant, and binder.
28. The composition of claim 11 , wherein a molar ratio of the thermal stability agent:nitrogenous material ranges from about 1:1 to about 10:1 and wherein the thermal stability agent forms, when the composition is combusted, one or more of a thermally protective barrier and heat sink around the nitrogenous material to reduce thermal degradation of the nitrogenous material and further comprising one or more of flyash and bottom ash.
29. The composition of claim 11 , wherein a molar ratio of the thermal stability agent:nitrogenous material ranges from about 1:1 to about 10:1, wherein the thermal stability agent forms, when the composition is combusted, one or more of a thermally protective barrier and heat sink around the nitrogenous material to reduce thermal degradation of the nitrogenous material, and wherein the thermal stability agent comprises one or more of magnesium hydroxide, magnesium carbonate, and magnesium bicarbonate.
30. A composition, comprising:
particulate coal; and
an additive composition to react with a contaminant from combustion of the coal particles, the additive composition comprising:
a nitrogenous material in the form of particles having an exterior particle surface and comprising one or more of ammonia, an amine, an amide, cyanuric acid, a nitride, and urea; and
a thermal stability agent comprising an alkaline earth metal hydroxide, carbonate, and/or bicarbonate, wherein the thermal stability agent is bound to and in contact with at least part of the exterior particle surface and wherein a molar ratio of the thermal stability agent:nitrogenous material ranges from about 1:1 to about 10:1.
31. The composition of claim 30 , wherein a molar ratio of the thermal stability agent:nitrogenous material ranges from about 1:1 to about 8:1, wherein the thermal stability agent thermally protects the nitrogenous material from one or more of combustion and thermal breakdown, wherein the thermal stability agent comprises one or more of a metal hydroxide, metal carbonate, metal bicarbonate, and ash, wherein the thermal stability agent forms, when the composition is combusted, one or more of a thermally protective barrier and heat sink around the nitrogenous material to reduce thermal degradation of the nitrogenous material, wherein the thermal stability agent substantially surrounds the exterior particle surface, and wherein an iron content of the coal is less than about 10 wt. % (dry basis of the ash) as Fe 2 O 3 , and wherein an alkali content of the coal is at least about 20 wt. % (dry basis of the ash) alkali.
32. The composition of claim 30 , wherein a weight ratio of the thermal stability agent:nitrogenous material ranges from about 0.5:1 to about 8:1, wherein the thermal stability agent is a heat sink, wherein the thermal stability agent comprises one or more of a metal hydroxide, metal carbonate, metal bicarbonate, and ash, wherein the thermal stability agent forms, when the composition is combusted, one or more of a thermally protective barrier and heat sink around the nitrogenous material to reduce thermal degradation of the nitrogenous material, wherein the thermal stability agent substantially surrounds the exterior particle surface, and wherein an iron content of the coal is less than about 10 wt. % (dry basis of the ash) as Fe 2 O 3 , and wherein an alkali content of the coal is at least about 20 wt. % (dry basis of the ash) alkali.
33. The composition of claim 30 , wherein a weight ratio of the thermal stability agent:nitrogenous material ranges from about 0.5:1 to about 8:1, wherein the nitrogenous material particulates further comprise a substrate, wherein the thermal stability agent forms, when the composition is combusted, one or more of a thermally protective barrier and heat sink around the nitrogenous material to reduce thermal degradation of the nitrogenous material, and wherein the thermal stability agent substantially surrounds the exterior particle surface, and wherein the substrate is a porous matrix comprising one or more of zeolite, char, graphite, and ash.
34. The composition of claim 33 , wherein a molar ratio of the thermal stability agent:nitrogenous material ranges from about 1.5:1 to about 5:1, and wherein the composition is fed to a combustor, and wherein the coal particles and additive composition are mixed together, and wherein the substrate is one or more of flyash and bottom ash.
35. The composition of claim 33 , wherein a weight ratio of the thermal stability agent:nitrogenous material ranges from about 1:1 to about 4:1, and wherein the substrate comprises from about 10 to about 90 wt % of the additive composition.
36. The composition of claim 30 , wherein a weight ratio of the thermal stability agent:nitrogenous material ranges from about 0.5:1 to about 8:1, and wherein the composition is fed to a combustor, wherein the coal particles and additive composition are mixed together, and further comprising a binder, wherein the binder adheres the thermal stability agent to the nitrogenous material.
37. The composition of claim 36 , wherein a molar ratio of the thermal stability agent:nitrogenous material ranges from about 1.5:1 to about 5:1, and wherein the binder comprises from about 0 to about 5 wt % of the additive composition.
38. The composition of claim 36 , wherein a weight ratio of the thermal stability agent:nitrogenous material ranges from about 1:1 to about 4:1, and wherein the binder is one or more of a wax, wax derivative, gum, gum derivative, and alkaline binding agent.
39. The composition of claim 38 , wherein a molar ratio of the thermal stability agent:nitrogenous material ranges from about 1.5:1 to about 5:1, and wherein the alkaline binding agent comprises one or more of an alkali hydroxide, alkali carbonate, alkali bicarbonate, lime, limestone, caustic soda, trona, alkaline earth metal hydroxide, alkaline earth metal carbonate, and alkaline earth bicarbonate.
40. The composition of claim 30 , wherein a weight ratio of the thermal stability agent:nitrogenous material ranges from about 0.5:1 to about 8:1, wherein the thermal stability agent forms, when the composition is combusted, one or more of a thermally protective barrier and heat sink around the nitrogenous material to reduce thermal degradation of the nitrogenous material, wherein the thermal stability agent substantially surrounds the exterior particle surface, and wherein the composition is in the form of one or more of a slurry and sludge.
41. The composition of claim 30 , wherein a weight ratio of the thermal stability agent:nitrogenous material ranges from about 0.5:1 to about 8:1, wherein the composition comprises solid particles, wherein the particles have a moisture level, wherein the thermal stability agent forms, when the composition is combusted, one or more of a thermally protective barrier and heat sink around the nitrogenous material to reduce thermal degradation of the nitrogenous material, and wherein the thermal stability agent substantially surrounds the exterior particle surface.
42. The composition of claim 30 , wherein a weight ratio of the thermal stability agent:nitrogenous material ranges from about 0.5:1 to about 8:1, and wherein the thermal stability agent forms, when the composition is combusted, one or more of a thermally protective barrier and heat sink around the nitrogenous material to reduce thermal degradation of the nitrogenous material, wherein the thermal stability agent substantially surrounds the exterior particle surface, and wherein the thermal stability agent comprises one or more of magnesium hydroxide, magnesium carbonate, and magnesium bicarbonate.
43. The composition of claim 30 , wherein a weight ratio of the thermal stability agent:nitrogenous material ranges from about 0.5:1 to about 8:1, wherein the thermal stability agent forms, when the composition is combusted, one or more of a thermally protective barrier and heat sink around the nitrogenous material to reduce thermal degradation of the nitrogenous material, wherein the thermal stability agent substantially surrounds the exterior particle surface, and further comprising coal, and wherein the coal is one or more of a high alkali coal, a high iron coal, and a high sulfur coal.
44. The composition of claim 30 , wherein a weight ratio of the thermal stability agent:nitrogenous material ranges from about 0.5:1 to about 8:1, wherein the thermal stability agent forms, when the composition is combusted, one or more of a thermally protective barrier and heat sink around the nitrogenous material to reduce thermal degradation of the nitrogenous material, and wherein the thermal stability agent substantially surrounds the exterior particle surface, and further comprising one or more of a stabilizing agent, dispersant, and binder.
45. The composition of claim 30 , wherein a weight ratio of the thermal stability agent:nitrogenous material ranges from about 0.5:1 to about 8:1, wherein the thermal stability agent forms, when the composition is combusted, one or more of a thermally protective barrier and heat sink around the nitrogenous material to reduce thermal degradation of the nitrogenous material, and wherein the thermal stability agent substantially surrounds the exterior particle surface, and further comprising one or more of flyash and bottom ash.
46. The composition of claim 30 , wherein a weight ratio of the thermal stability agent:nitrogenous material ranges from about 0.5:1 to about 8:1, wherein the thermal stability agent forms, when the composition is combusted, one or more of a thermally protective barrier and heat sink around the nitrogenous material to reduce thermal degradation of the nitrogenous material, wherein the thermal stability agent substantially surrounds the exterior particle surface, and wherein the thermal stability agent comprises one or more of magnesium hydroxide, magnesium carbonate, and magnesium bicarbonate.