[특허]Burner system employing flue gas recirculation

ExxonMobil Chemical Patents Inc.

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특허 상세정보

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내보내기 페이스북 공유 트위터 공유 카카오톡 공유

Burner system employing flue gas recirculation

특허상세정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F23M-003/00
미국특허분류(USC)	431/009; 431/005; 126/091.A
출원번호	US-0389599 (2003-03-14)
발명자 / 주소	Stephens, George
출원인 / 주소	ExxonMobil Chemical Patents Inc.
인용정보	피인용 횟수 : 5 인용 특허 : 60

초록
▼

System for reducing NOx emissions from burners of furnaces such as those used in steam cracking. The system includes a furnace having at least one burner, the at least one burner including a primary air chamber; a burner tube including a downstream end, an upstream end in fluid communication with the primary air chamber for receiving air, flue gas or mixtures thereof and fuel, a venturi portion positioned between the downstream end and the upstream end, and a burner tip mounted on the downstream end of the burner tube adjacent the first opening in the furnace for combusting the fuel downstream of the burner tip; and a fuel orifice located adjacent the upstream end of the burner tube for introducing fuel into the burner tube; a source of flue gas, said source positioned so as to enable the flue gas to achieve a temperature of less than 2000° F. at least one passageway for conducting flue gas from the source to the primary air chamber; and inspirating means, the inspirating means including the venturi portion effective for drawing flue gas from the source, through the at least one passageway and the primary air chamber in response to an inspirating effect of uncombusted fuel exiting the fuel orifice, the uncombusted fuel flowing through the burner tube from its upstream end towards its downstream end, whereby the flue gas is mixed with air at the upstream end of the burner tube prior to the zone of combustion of the fuel.

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청구항
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1. A system for reducing NOx emissions in the combustion of fuel comprising:(a) a furnace having at least one burner, said at least one burner comprising: (i) a primary air chamber; (ii) a burner tube including a downstream end, an upstream end in fluid communication with said primary air chamber for receiving air, flue gas or mixtures thereof and fuel, a venturi portion positioned between said downstream end and said upstream end, and a burner tip mounted on the downstream end of said burner tube for combusting fuel downstream of said burner tip; and (iii) a fuel orifice located adjacent the upstream end of said burner tube for introducing fuel into said burner tube; (b) a source of flue gas, said source positioned so as to enable the flue gas to achieve a temperature of less than 2000° F.; (c) at least one passageway for conducting flue gas from said source to said primary air chamber; and (d) inspirating means positioned within said at least one burner, said inspirating means including said venturi portion effective for drawing flue gas from said source, through said at least one passageway and said primary air chamber in response to an inspirating effect of uncombusted fuel exiting said fuel orifice, the uncombusted fuel flowing through said burner tube from its upstream end towards its downstream end, whereby the flue gas is mixed with air and fuel at said upstream end of said burner tube prior to the zone of combustion of the fuel. 2. The system of claim 1, wherein said fuel orifice is located within a gas spud.3. The system of claim 1, wherein said at least one burner is a pre-mix burner.4. The system of claim 1, wherein said at least one burner is a flat-flame burner.5. The system of claim 1, wherein the fuel comprises fuel gas.6. The system of claim 1, wherein said source is an exhaust of said furnace, said source positioned to enable flue gas having a temperature of less than 1000° F. to be drawn therefrom.7. The system of claim 1, wherein said source is an exhaust of said furnace, said source positioned to enable flue gas having a temperature of less than 700° F. to be drawn therefrom.8. The system of claim 6, wherein said at least one burner further comprises at least one air opening to said furnace, a secondary air chamber in fluid communication with said at least one air opening, and at least one adjustable damper opening into said secondary air chamber to restrict the amount of air entering into said secondary air chamber.9. The system of claim 8, wherein said secondary air chamber is in fluid communication with a plurality of said air openings.10. The system of claim 9, wherein said inspirating means is sufficient to draw an effective amount of flue gas from said source through said at least one passageway and into said primary chamber, without the aid of an external fan.11. The system of claim 6, wherein said inspirating means is sufficient to draw an effective amount of flue gas from said source through said at least one passageway and into said primary chamber, without the aid of an external fan, so as to reduce NOx.12. The system of claim 1, wherein said inspirating means is sufficient to draw an effective amount of flue gas from said source through said at least one passageway and into said primary chamber, without the aid of an external fan.13. The system of claim 12, further comprising means for injecting steam into the upstream end of said burner tube to increase motive force of said inspirating means and to cause a further reduction in NOx emissions.14. The system of claim 1, further comprising means for injecting steam into said primary air chamber to increase motive force of said inspirating means and to cause a further reduction in NOx emissions.15. The system of claim 1, wherein said burner further comprises a gas riser for mounting said fuel orifice thereon.16. The system of claim 15, wherein said fuel orifice is located within a gas spud.17. The system of claim 1, wherein said furnace comprises a plurality of burners.18. The system of claim 17, wherein said plurality of burners share a single passageway for conducting flue gas from said source to said primary air chamber.19. The system of claim 1, wherein the furnace is a steam-cracking furnace.20. A method of reducing NOx emissions in a burner, said burner including a fuel orifice, said method comprising the steps of:(a) providing a source of flue gas, the source positioned so as to enable the flue gas to achieve a temperature of less than 2000° F.; (b) combining fuel and air, flue gas or mixtures thereof at a predetermined location adjacent a venturi; (c) passing the combined fuel and air, flue gas or mixtures thereof through the venturi; and (d) combusting the fuel at a combustion zone downstream of the venturi; whereby the inspirating effect of the uncombusted fuel exiting the fuel orifice and flowing through the venturi draws flue gas from the source through a passageway to the predetermined location. 21. The method of claim 20, wherein the fuel orifice is located within a gas spud.22. The method of claim 20, wherein the at least one burner is a pre-mix burner.23. The method of claim 20, wherein the at least one burner is a flat-flame burner.24. The method of claim 20, wherein the fuel comprises fuel gas.25. The method of claim 20, further comprising adjustably dampening flow of air to the primary air chamber.26. The method of claim 20, further comprising adjustably dampening flow of air to the secondary air chamber.27. The method of claim 20, wherein the flue gas is drawn from an exhaust stream of the furnace.28. The method of claim 25, wherein the flue gas is drawn from an exhaust stream of the furnace.29. The method of claim 26, wherein the flue gas is drawn from an exhaust stream of the furnace.30. The method of claim 29, wherein the burner is a flat-flame burner.31. The method of claim 20, wherein the furnace is a steam cracking furnace.32. The method of claim 27, wherein the furnace is a steam cracking furnace.33. The method of claim 28, wherein the furnace is a steam cracking furnace.34. The method of claim 20, wherein the furnace comprises a plurality of burners.35. The method of claim 34, wherein the plurality of burners share a single passageway for conducting flue gas from said source to said primary air chamber.36. The method of claim 20, wherein the at least one burner further comprises means for injecting steam into the upstream end of the venturi to increase the inspirating effect and to cause a further reduction in NOx emissions.

이 특허에 인용된 특허 (60)

이 특허를 인용한 특허 피인용횟수: 5

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Burner system employing flue gas recirculation

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Burner system employing flue gas recirculation

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