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  Counterflow fuel injection nozzle in a burner-boiler systemUSPTO Application #: 20070057090Title: Counterflow fuel injection nozzle in a burner-boiler system Abstract: A counterflow fuel injection nozzle for injecting fuel is disclosed. The nozzle includes a nozzle wall having an interior surface that defines a nozzle interior, the interior for receiving a fuel therein. The nozzle further has a fuel passageway formed in the nozzle wall for distributing the fuel from the interior to a location exterior of the nozzle, the fuel distributed to the exterior location in a fuel flow injection direction. An airstream is provided in a prevailing air flow direction in the location exterior of the nozzle. At least one vector component of the fuel flow injection direction opposes at least one vector component of the prevailing air flow direction. In this manner, by distributing fuel into an air flow at a counterflow angle, improved control of mixing of the fuel in the air is achieved. The counterflow nozzle may be included as part of a new burner or as a retrofit to existing burners in order to incorporate counterflow mixing. Advantageously, burner turndown ratios and stability are enhanced through the use of the counterflow fuel injection nozzles with burners that use FGR (i.e., have lower O2 in combustion air supplied to the burner). (end of abstract)
Agent: Whyte Hirschboeck Dudek S C - Milwaukee, WI, US Inventors: Bernard Labelle, Normand Brais, Normand Bujold, Daniel J. Willems, Ad de Pijper, Eugene Showers USPTO Applicaton #: 20070057090 - Class: 239418000 (USPTO) Related Patent Categories: Fluid Sprinkling, Spraying, And Diffusing, Combining Of Separately Supplied Fluids (i.e., Plural Flow Paths), At Or Beyond Outlet The Patent Description & Claims data below is from USPTO Patent Application 20070057090. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application is a Continuation-In-Part of U.S. Ser. No. 10/857,399, filed May 28, 2004, pending, which also claims the benefit of the filing date of U.S. application Ser. No. 60/474,470, filed on May 31, 2003. FIELD AND BACKGROUND OF THE INVENTION [0002] The field of the invention relates generally to fuel injection nozzles, and more particularly, to a counterflow fuel injection nozzle. [0003] Burners are used in boilers, heaters, and other applications for the conversion of fuel to heat. The heat is then transferred to make hot water, steam, and/or warm air, or to create power, depending upon the application. In a burner-boiler system (e.g., firetube and commercial and industrial watertube boilers), fuel is typically injected through nozzles to create a flame. The fuel is combined with air flowing around or adjacent the nozzle. Ultimately, the fuel is ignited to create a flame, with a goal being to maximize the conversion of the fuel that is burned during this combustion process so as to achieve complete combustion. The manner in which the fuel is injected (i.e., its direction, velocity, and interaction with other fluid streams) into the air stream affects the flame profile or shape and thus greatly determines the completeness of the combustion and heat release into the furnace. The injection method affects the overall geometry and physical characteristics of the nozzle itself. For example, the fuel is typically injected through passageway(s) formed in the nozzle, and more particularly, the nozzle body. These physical characteristics include the width or diameter, spacing, and angling or pitch of the particular passageway(s) or channel(s). [0004] It is a continuing design goal to control mixing (e.g., quality, uniformity, rate, etc.) of the fuel and air by the burner so that air and fuel are evenly mixed. Variations in the width, spacing and pitch of the passageways of the nozzle used for distributing fuel from the nozzle yield varied mixing results, flame profiles, flame locations and overall combustion performance factors. It has been found that angled injection passageways that inject the fuel in a counterflow fashion contribute positively to the aforementioned factors. By "counterflow" it is meant that the fuel is injected into a flow of air such that at least one vector component of the fuel flow opposes at least one vector component of the air flow. Therefore, it would be desirable, in a burner using a gaseous fuel (e.g, natural gas), to be able to improve control of the mixing of the fuel with air by introducing the fuel into the air in counterflow fashion. BRIEF SUMMARY OF THE INVENTION [0005] Disclosed herein is a counterflow fuel injection nozzle for injecting fuel, the nozzle comprising: a nozzle wall having an interior surface that defines a nozzle interior. The interior for receiving a fuel therein, the nozzle further having a fuel passageway formed in the nozzle wall for distributing the fuel from the interior to a location exterior of the nozzle, the fuel distributed to the exterior location in a fuel flow injection direction. When an airstream is provided in a prevailing air flow direction in the location exterior of the nozzle, at least one vector component of the fuel flow injection direction opposes at least one vector component of the prevailing air flow direction. [0006] Other objects, aspects, and advantages of the invention will be apparent upon a thorough reading of the detailed description below along with the drawings, BRIEF DESCRIPTION OF THE DRAWINGS [0007] Embodiments of the invention are disclosed with reference to the accompanying drawings and are for illustrative purposes only. The invention is not limited in its application to the details of construction or the arrangement of the components illustrated in the drawings. The invention is capable of other embodiments or of being practiced or carried out in other various ways. Like reference numerals are used to indicate like components. In the drawings: [0008] FIG. 1 is perspective partially cut-away view of a burner incorporating an embodiment of a counterflow fuel injection nozzle of the present invention; [0009] FIG. 1a is a front view of a burner incorporating an embodiment of the counterflow fuel injection nozzle of the present invention; [0010] FIG. 2a is a side sectional view taken along line 2a-2a of FIG. 1a; [0011] FIG. 2b is a diagram schematically illustrating the concept of counterflow with respect to a representation of the present inventive counterflow fuel injection nozzles; [0012] FIG. 2c is a representation of various hole and distance parameters associated with the counterflow fuel injection nozzle illustrating the parameters that affect the interaction of fuel jets from adjacent nozzles; [0013] FIG. 2d is a graphical representation of various penetration depths of the fuel and overall fuel distribution patterns associated with the present invention; [0014] FIG. 3 is an enlarged sectional view taken along line 3-3 of FIG. 2a; [0015] FIG. 4 is a perspective view of one embodiment of the counterflow fuel injection nozzle according to one aspect of the present invention; [0016] FIG. 5 is a bottom sectional view taken along line 5-5 of FIG. 3; [0017] FIG. 6 is a perspective view of another embodiment of the counterflow fuel injection nozzle according to one aspect of the present invention; [0018] FIG. 7 is a side sectional view of the counterflow fuel injection nozzle of FIG. 6; [0019] FIG. 8 is a bottom sectional view taken along line 8-8 of FIG. 7 and illustrating exemplary counterflow injection angles; [0020] FIG. 9 is a perspective view of another embodiment of the counterflow fuel injection nozzle according to one aspect of the present invention; Continue reading... Full patent description for Counterflow fuel injection nozzle in a burner-boiler system Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Counterflow fuel injection nozzle in a burner-boiler system patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Counterflow fuel injection nozzle in a burner-boiler system or other areas of interest. ### Previous Patent Application: Image generating process Next Patent Application: Spray head with a nozzle insert Industry Class: Fluid sprinkling, spraying, and diffusing ### FreshPatents.com Support Thank you for viewing the Counterflow fuel injection nozzle in a burner-boiler system patent info. 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