Claims
- 1. A burner for the combustion of fuel gas in a furnace, said burner comprising:
(a) a burner tube having a longitudinal axis and having a downstream end and an upstream end for receiving fuel gas and air, flue gas or mixtures thereof; (b) a fuel orifice located adjacent the upstream end of said burner tube, for introducing fuel gas into said burner tube; (c) a burner tip mounted on the downstream end of said burner tube and adjacent a first opening in the furnace, said burner tip having a plurality of main ports substantially aligned with said longitudinal axis of the burner tube, and a plurality of peripherally arranged side ports; and (d) a peripheral tile which peripherally surrounds said burner tip, said peripheral tile providing at least one gap between an outer periphery of said burner tip and said peripheral tile, said at least one gap effective for providing a portion of the air for combustion wherein the quantity of fuel gas discharged during combustion from said peripherally arranged side ports does not exceed 15% of the total fuel gas combusted.
- 2. The burner according to claim 1, wherein the dimension of the burner-tip-to-peripheral-tile gap is such that the total air available to the fuel gas exiting the side ports is between about 5 to about 15 percentage points above a Fuel Rich Flammability Limit for the fuel gas being used.
- 3. The burner according to claim 2, wherein the fuel gas discharged during combustion from said peripherally arranged side ports is between about 5 to about 15 percent of the total fuel gas combusted.
- 4. The burner according to claim 1, wherein the fuel gas discharged during combustion from said peripherally arranged side ports is between about 5 to about 15 percent of the total fuel gas combusted.
- 5. The burner according to claim 2, wherein the fuel gas discharged during combustion from said peripherally arranged side ports is about ten percent of the total fuel gas combusted.
- 6. The burner according to claim 1, wherein the fuel gas discharged during combustion from said peripherally arranged side ports is about ten percent of the total fuel gas combusted.
- 7. The burner according to claim 6, wherein the at least one burner-tip-to-peripheral-tile gap is between about 0.15 to about 0.40 inches.
- 8. The burner according to claim 4, wherein the at least one burner-tip-to-peripheral-tile gap is between about 0.15 to about 0.40 inches.
- 9. The burner according to claim 1, wherein the at least one burner-tip-to-peripheral-tile gap is between about 0.15 to about 0.40 inches.
- 10. The burner according to claim 1, wherein said fuel orifice is located within a gas spud.
- 11. The burner of claim 1, further comprising a steam injection tube for injecting steam upstream of said burner tube.
- 12. The burner of claim 1, wherein said burner is a flat-flame burner.
- 13. The burner of claim 1, wherein said burner is a pre-mix burner.
- 14. A method for combusting fuel in a burner of a furnace, comprising the steps of:
(a) combining fuel gas and air, flue gas or mixtures thereof at a predetermined location adjacent a fuel orifice; (b) passing the fuel gas and air, flue gas or mixtures thereof through a burner tube; (c) discharging the fuel gas and air, flue gas or mixtures thereof at a burner tip downstream of the predetermined location, the burner tip having a plurality of main ports substantially aligned with the longitudinal axis of the burner tube, arranged on an upper surface thereof, and a plurality of peripherally arranged side ports, the burner tip peripherally surrounded by a peripheral tile; and (d) combusting said fuel gas downstream of the burner tip downstream of said predetermined location; wherein the quantity of fuel gas discharged during combustion from said peripherally arranged side ports does not exceed 15% of the total fuel gas combusted.
- 15. The method according to claim 14, further comprising the step of providing at least one gap between an outer periphery of said burner tip and the peripheral tile, each of the at least one gap effective for providing a portion of the air for combustion.
- 16. The method according to claim 15, wherein the dimension of the at least one burner-tip-to-peripheral-tile gap is such that the total air available to the fuel gas exiting the side ports is between about 5 to about 15 percentage points above a Fuel Rich Flammability Limit for the fuel gas being combusted.
- 17. The method according to claim 16, wherein the fuel gas discharged during combustion from the peripherally arranged side ports is about ten percent of the total fuel gas combusted.
- 18. The method according to claim 17, further comprising the step of drawing a stream of flue gas from the furnace.
- 19. The method according to claim 18, wherein the stream of flue gas drawn from the furnace is drawn in response to the aspirating effect of uncombusted fuel gas exiting the fuel orifice and flowing towards said combustion zone.
- 20. The method according to claim 19, further comprising the step of mixing air having a temperature lower than the temperature of the flue gas with the stream of flue gas and drawing the mixture of the lower temperature air and flue gas, to said predetermined location, to thereby lower the temperature of the drawn flue gas.
- 21. The method according to claim 20, wherein said drawing step includes passing the fuel gas and air, flue gas or mixtures thereof; through a venturi, whereby the aspirating effect of the uncombusted fuel gas exiting the fuel orifice and flowing through said venturi draws the flue gas and lower temperature air into the venturi.
- 22. The method according to claim 15, wherein the fuel gas discharged during combustion from said peripherally arranged side ports is between about 5 to about 15 percent of the total fuel gas combusted.
- 23. The method according to claim 15, wherein the at least one burner-tip-to-peripheral-tile gap is between about 0.15 to about 0.40 inches.
- 24. The method according to claim 14, wherein the fuel orifice is located within a gas spud.
- 25. The method according to claim 14, further comprising the step of injecting steam upstream of the burner tube.
- 26 The method according to claim 14, wherein the burner is a pre-mix burner.
- 27. The method according to claim 14, wherein the burner is a flat-flame burner.
- 28 The method according to claim 14, wherein the burner is installed in a steam-cracking furnace.
RELATED APPLICATIONS
[0001] This patent application claims priority from Provisional Application Ser. No. 60/365,223, filed on Mar. 16, 2002, the contents of which are hereby incorporated by reference.
Provisional Applications (1)
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Number |
Date |
Country |
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60365223 |
Mar 2002 |
US |