Three stage low NOx burner system with controlled stage air separation
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F23M-003/00
출원번호
US-0972745
(2008-01-11)
등록번호
US-8485813
(2013-07-16)
발명자
/ 주소
Feese, James J.
Wartluft, Bruce A.
출원인 / 주소
Hauck Manufacturing Company
대리인 / 주소
Woodcock Washburn LLP
인용정보
피인용 횟수 :
1인용 특허 :
12
초록▼
A low NOx burner system is disclosed that reduces the emission of CO and HC during cold furnace startups, minimizes NOx formation with preheated air, and provides a flat stable flame due to burner design improvements including three stage combustion. The burner system is designed to operate in eithe
A low NOx burner system is disclosed that reduces the emission of CO and HC during cold furnace startups, minimizes NOx formation with preheated air, and provides a flat stable flame due to burner design improvements including three stage combustion. The burner system is designed to operate in either a low or high temperature mode by controlling the amount of combustion air provided to stage 1 and stage 2 combustion. The burner system is designed to heat the interior of a furnace for high-temperature combustion/furnace processes, such as aluminum melting and steel processes. The burner system can also be used for low temperature processes at temperatures below the auto-ignition temperature of the fuel and still produce very low CO, HC and NOx emissions.
대표청구항▼
1. An air staged low NOx flat flame burner system, comprising: a burner body comprising a primary air chamber and a secondary air chamber;an air inlet section comprising a main air inlet, the main air inlet attached to the burner body and configured to provide combustion air directly to the secondar
1. An air staged low NOx flat flame burner system, comprising: a burner body comprising a primary air chamber and a secondary air chamber;an air inlet section comprising a main air inlet, the main air inlet attached to the burner body and configured to provide combustion air directly to the secondary air chamber;a nozzle section comprising a nozzle and a flame holder and disposed at one end of the burner body;a fuel passageway extending through the burner body and nested within the nozzle section, the fuel passageway comprising a tube configured to bleed fuel into venturi tubes that inject the bled fuel into the stage 1 air as it exits the stage 1 air passageways;a port block comprising an interior cavity and disposed around the nozzle section, the port block being configured for forming a flat flame wherein the port block comprises a annular first section having a substantially constant cross-section and an annular second section having an expanding cross-section; and,means for imparting swirl to air in the secondary air chamber,whereby configuration of the burner system produces a flat flame. 2. The burner system of claim 1, wherein the air inlet section further comprises a by-pass having a staged air valve configured to regulate a predetermined amount of combustion air through the air stage valve and into the primary air chamber. 3. The burner system of claim 1, wherein the air inlet section further comprises a divider plate and a stage air valve configured to regulate a predetermined amount of combustion air passing through the air stage valve and into the primary air chamber. 4. The burner system of claim 1, wherein the burner body further comprises a primary air inlet for providing a predetermined amount of combustion air to the primary air chamber. 5. The burner system of claim 1, wherein the nozzle section comprises stage 1 air passageways for receiving stage 1 air from the primary air chamber and stage 2 air passageways for receiving stage 2 air from the primary air chamber. 6. The burner system of claim 1, wherein the nozzle section further comprises the swirl rack that is configured to receive stage 3 air from the secondary air chamber and provide rotation to the stage 3 air as it is provided to the interior cavity of the port block. 7. The burner system of claim 1, wherein the burner body further comprises an orifice plate configured to impart a rotational swirling motion to stage 3 air within the secondary air chamber. 8. The burner system of claim 1, wherein the passageway tube is configured to bleed fuel into the venturi tubes through holes in the passageway tube. 9. The burner system of claim 7, wherein the nozzle is configured to inject fuel into the rotating stage 3 air in the port block first annular cross-section. 10. The burner system of claim 1, wherein the nozzle section includes stage 1 air passageways, stage 2 air passageways, and stage 3 air passageways that extend to an outlet of the nozzle section without recirculation. 11. The burner system of claim 10, wherein the nozzle section further comprises a swirl rack configured to receive stage 3 air from the secondary air chamber and provide rotation to the stage 3 air as it is provided to the interior cavity of the port block. 12. The burner system of claim 1, wherein the port block is located in a furnace wall, wherein the flat flame hugs the furnace wall. 13. The burner system of claim 1, wherein the port block is located in a furnace wall and a forward-most tip of the port block is flush with a furnace wall. 14. The burner system of claim 1 wherein the means for imparting swirl is a part of the nozzle. 15. The burner system of claim 1 wherein the flame holder includes radial holes that are configured to allow a portion of fuel and air to be pulled from the primary air chamber into the secondary air chamber. 16. An air staged low NOx flat flame burner system, comprising: a burner body comprising a primary air chamber and a secondary air chamber; an air inlet section comprising a main air inlet, the main air inlet attached to the burner body and configured to provide combustion air directly to the secondary air chamber; a nozzle section comprising a nozzle and a flame holder and disposed at one end of the burner body; a fuel passageway extending through the burner body and nested within the nozzle section; a port block comprising an interior cavity and disposed around the nozzle section, the port block being configured for forming a flat flame wherein the port block comprises a annular first section having a substantially constant cross-section and an annular second section having an expanding cross-section; and, means for imparting swirl to air in the secondary air chamber, wherein the nozzle is configured to inject fuel into the rotating stage 3 air in the port block first annular cross-section; whereby configuration of the burner system produces a flat flame. 17. The burner system of claim 16 wherein the flame holder includes radial holes that are configured to allow a portion of fuel and air to be pulled from the primary air chamber into the secondary air chamber.
Irwin Bruce C. (Palmyra PA) Moore Edward E. (Hummelstown PA) Baum Raymond F. (Lebanon PA), Combination burner with primary and secondary fuel injection.
Joshi Mahendra L. ; Borders Harley A. ; Marin Ovidiu ; Charon Olivier, Self-cooled oxygen-fuel burner for use in high-temperature and high-particulate furnaces.
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