초록 ▼

A hot oxygen stream is fed into a catalyst regenerator flue gas stream that contains carbon monoxide to remove carbon monoxide. NOx precursors such as NH3 and HCN are converted into N2 and if NOx is present in the flue gas stream the addition of the hot oxygen stream lowers the amount of NOx present

A hot oxygen stream is fed into a catalyst regenerator flue gas stream that contains carbon monoxide to remove carbon monoxide. NOx precursors such as NH3 and HCN are converted into N2 and if NOx is present in the flue gas stream the addition of the hot oxygen stream lowers the amount of NOx present.

대표청구항 ▼

What is claimed is: 1. A method for treating a regenerator flue gas stream comprising (A) providing from a catalyst regenerator a regenerator flue gas stream that contains NOx and carbon monoxide; (B) mixing fuel and oxygen and combusting a portion of the oxygen in the mixture with said fuel to for

What is claimed is: 1. A method for treating a regenerator flue gas stream comprising (A) providing from a catalyst regenerator a regenerator flue gas stream that contains NOx and carbon monoxide; (B) mixing fuel and oxygen and combusting a portion of the oxygen in the mixture with said fuel to form a hot oxidant stream that has a temperature of at least 2000 F and that contains oxygen and products of said combustion; (C) feeding the hot oxidant stream at a velocity of at least 500 feet per second into the regenerator flue gas stream to form a mixture having a temperature higher than 1250 F sufficient to convert carbon monoxide in the mixture to carbon dioxide and to convert NOx in the mixture to N2 thereby producing a product stream wherein the amount of NOx in the product stream following said conversion is less than the amount of NOx in said regenerator flue gas stream before said mixture is formed. 2. A method according to claim 1 wherein the mixture that is formed in step (C) of the hot oxidant stream and the regenerator flue gas has a temperature of at least 1400 F. 3. A method according to claim 1 wherein the mixture that is formed in step (C) of the hot oxidant stream and the regenerator flue gas has a temperature of at least 1600 F. 4. A method according to claim 1 wherein the regenerator flue gas provided in step (A) contains at least 1 vol. % carbon monoxide. 5. A method according to claim 1 wherein no more than 20% of the oxygen mixed with fuel in step (B) is combusted in step (B). 6. A method according to claim 1 wherein the hot oxidant stream formed in step (B) is fed into the regenerator flue gas stream in step (C) at a velocity of 500 to 3000 feet per second. 7. A method according to claim 1 wherein the regenerator flue gas stream is passed through a power recovery turbine before the hot oxidant stream is fed into it in step (C). 8. A method according to claim 1 wherein the product stream produced in step (C) is passed through a power recovery turbine. 9. A method for treating a regenerator flue gas stream comprising (A) providing from a catalyst regenerator a regenerator flue gas stream that contains NOx and carbon monoxide; (B) mixing fuel and oxygen and combusting a portion of the oxygen in the mixture with said fuel to form a first hot oxidant stream that has a temperature of at least 2000 F and that contains oxygen and products of said combustion; (C) feeding the first hot oxidant stream into the regenerator flue gas stream to form a first mixture having a temperature higher than 1250 F sufficient to convert carbon monoxide in the mixture to carbon dioxide and to convert NOx in the mixture to N2, thereby producing a stream comprising carbon monoxide, carbon dioxide, NOx and N2; (D) mixing fuel and oxygen and combusting a portion of the oxygen in the mixture with said fuel to form a second hot oxidant stream that has a temperature of at least 2000 F and that contains oxygen and products of said combustion; (E) feeding the second hot oxidant stream into the stream produced in step (C) to form a second mixture having a temperature higher than 1250 F sufficient to convert carbon monoxide in the second mixture to carbon dioxide and to convert NOx in the second mixture to N2 thereby producing a product stream wherein the amount of NOx in the product stream following said conversion is less than the amount of NOx in said regenerator flue gas stream before said first mixture was formed. 10. A method according to claim 9 wherein the first mixture formed in step (C), the second mixture formed in step (E), or both said mixtures, has a temperature of at least 1400 F. 11. A method according to claim 9 wherein the first mixture formed in step (C), the second mixture formed in step (E), or both said mixtures, has a temperature of at least 1600 F. 12. A method according to claim 9 wherein the regenerator flue gas provided in step (A) contains at least 1 vol. % carbon monoxide. 13. A method according to claim 9 wherein no more than 20% of the oxygen mixed with fuel in step (B) is combusted in step (B). 14. A method according to claim 9 wherein no more than 20% of the oxygen mixed with fuel in step (D) is combusted in step (D). 15. A method according to claim 9 wherein the hot oxidant stream formed in step (B) is fed into the regenerator flue gas stream in step (C) at a velocity of at least 500 feet per second. 16. A method according to claim 15 wherein the hot oxidant stream formed in step (D) is fed into the stream produced in step (C) at a velocity of at least 500 feet per second. 17. A method according to claim 9 wherein the hot oxidant stream formed in step (D) is fed into the stream produced in step (C) at a velocity of at least 500 feet per second. 18. A method according to claim 9 wherein the hot oxidant stream formed in step (B) is fed into the regenerator flue gas stream in step (C) at a velocity of 500 to 3000 feet per second. 19. A method according to claim 18 wherein the hot oxidant stream formed in step (D) is fed into the stream produced in step (C) at a velocity of 500 to 3000 feet per second. 20. A method according to claim 9 wherein the hot oxidant stream formed in step (D) is fed into the stream produced in step (C) at a velocity of 500 to 3000 feet per second. 21. A method according to claim 9 wherein the regenerator flue gas stream is passed through a power recovery turbine before the hot oxidant stream is fed into it in step (C). 22. A method according to claim 9 wherein the stream produced in step (C) is passed through a power recovery turbine before the second hot oxidant stream is fed into it in step (E). 23. A method according to claim 9 wherein the product stream produced in step (L) is passed through a power recovery turbine. 24. A method for treating a regenerator flue gas stream comprising (A) providing from a catalyst regenerator a regenerator flue gas stream that contains no NOx and contains carbon monoxide and one or both of NH3 and HCN; (B) mixing fuel and oxygen and combusting a portion of the oxygen in the mixture with said fuel to form a hot oxidant stream that has a temperature of at least 2000 F and that contains oxygen and products of said combustion; (C) feeding the hot oxidant stream at a velocity of at least 500 feet per second into the regenerator flue gas stream to form a mixture having a temperature higher than 1250 F sufficient to convert carbon monoxide in the mixture to carbon dioxide and to convert one or both of NH3 and HCN in the mixture to N2. 25. A method according to claim 24 wherein the mixture that is formed in step (C) of the hot oxidant stream and the regenerator flue gas has a temperature of at least 1400 F. 26. A method according to claim 24 wherein the mixture that is formed in step (C) of the hot oxidant stream and the regenerator flue gas has a temperature of at least 1600 F. 27. A method according to claim 24 wherein the regenerator flue gas provided in step (A) contains at least 1 vol. % carbon monoxide. 28. A method according to claim 24 wherein no more than 20% of the oxygen mixed with fuel in step (B) is combusted in step (B). 29. A method according to claim 24 wherein the hot oxidant stream formed in step (B) is fed into the regenerator flue gas stream in step (C) at a velocity of 500 to 3000 feet per second. 30. A method according to claim 24 wherein the regenerator flue gas stream is passed through a power recovery turbine before the hot oxidant stream is fed into it in step (C). 31. A method according to claim 24 wherein the product stream produced in step (C) is passed through a power recovery turbine. 32. A method for treating a regenerator flue gas stream comprising (A) providing from a catalyst regenerator a regenerator flue gas stream that contains no NOx and contains carbon monoxide and one or both of NH3 and HCN; (B) mixing fuel and oxygen and combusting a portion of the oxygen in the mixture with said fuel to form a first hot oxidant stream that has a temperature of at least 2000 F and that contains oxygen and products of said combustion; (C) feeding the first hot oxidant stream into the regenerator flue gas stream to form a first mixture having a temperature higher than 1250 F sufficient to convert carbon monoxide in the mixture to carbon dioxide and to convert NOx in the mixture to N2, thereby producing a stream comprising carbon monoxide, carbon dioxide, and N2; (D) mixing fuel and oxygen and combusting a portion of the oxygen in the mixture with said fuel to form a second hot oxidant stream that has a temperature of at least 2000 F and that contains oxygen and products of said combustion; (E) feeding the second hot oxidant stream into the stream produced in step (C) to form a second mixture having a temperature higher than 1250 F sufficient to convert carbon monoxide in the second mixture to carbon dioxide and to convert NH3 and HCN present in the second mixture to N2. 33. A method according to claim 32 wherein the first mixture formed in step (C), the second mixture formed in step (E), or both said mixtures, has a temperature of at least 1400 F. 34. A method according to claim 32 wherein the first mixture formed in step (C), the second mixture formed in step (E), or both said mixtures, has a temperature of at least 1600 F. 35. A method according to claim 32 wherein the regenerator flue gas provided in step (A) contains at least 1 vol. % carbon monoxide. 36. A method according to claim 32 wherein no more than 20% of the oxygen mixed with fuel in step (B) is combusted in step (B). 37. A method according to claim 32 wherein no more than 20% of the oxygen mixed with fuel in step (D) is combusted in step (D). 38. A method according to claim 32 wherein the hot oxidant stream formed in step (B) is fed into the regenerator flue gas stream in step (C) at a velocity of at least 500 feet per second. 39. A method according to claim 38 wherein the hot oxidant stream formed in step (D) is fed into the stream produced in step (C) at a velocity of at least 500 feet per second. 40. A method according to claim 32 wherein the hot oxidant stream formed in step (D) is fed into the stream produced in step (C) at a velocity of at least 500 feet per second. 41. A method according to claim 32 wherein the hot oxidant stream formed in step (B) is fed into the regenerator flue gas stream in step (C) at a velocity of 500 to 3000 feet per second. 42. A method according to claim 41 wherein the hot oxidant stream formed in step (D) is fed into the stream produced in step (C) at a velocity of 500 to 3000 feet per second. 43. A method according to claim 32 wherein the hot oxidant stream formed in step (D) is fed into the stream produced in step (C) at a velocity of 500 to 3000 feet per second. 44. A method according to claim 32 wherein the regenerator flue gas stream is passed through a power recovery turbine before the hot oxidant stream is fed into it in step (C). 45. A method according to claim 32 wherein the stream produced in step (C) is passed through a power recovery turbine before the second hot oxidant stream is fed into it in step (E). 46. A method according to claim 32 wherein the product stream produced in step (E) is passed through a power recovery turbine.