US3592575A

US3592575A - Burner nozzle tip

Info

Publication number: US3592575A
Application number: US844859A
Authority: US
Inventors: Kurt S Jaeger; Ross Forney
Original assignee: Forney International Inc
Current assignee: Forney Engineering Co; Forney International Inc
Priority date: 1969-07-25
Filing date: 1969-07-25
Publication date: 1971-07-13
Anticipated expiration: 1988-07-13
Also published as: JPS506377B1; BE753893A; GB1313932A; FR2055620A5; NL7010914A

Abstract

A fuel burner is provided in which the nozzle tip is formed with a frustoconical end wall integrally connected to a cylindrical outer wall and the walls have a common central axis. The outer walls are formed with a series of orifices which comprise equally spaced apart rows of orifices, positioned in straight lines that are parallel to the central axis of the walls.

Description

I United States Patent 13,592,s75

[72] Inventors Kurt S- Jaeger [56] References Cited UNITED STATES PATENTS 2 App NO gzi 'g 2.61 3,731 10/1952 Schwietert 239/549 x [22] Filed July 25 969 2,840,152 6/1958 Reed 239/549 X [45] Patented July 13, 197] Primary Examiner--Carroll B. Dority, Jr. [73] Assignee Forney Engineering Company Armmeys- John Maier. lll, Marvin A. Naigur and John E.

Dallas, Tex. Wilson [54] BURNER NOZZLE TIP 2 3 Drum! ABSTRACT: A fuel burner is provided in which the nozzle tip [52] [1.8. CI 431/114, is formed with a frustoconical end wall integrally connected to 239/549, 239/558, 239/559 a cylindrical outer wall and the walls have a common central [5|] Int. Cl F231! axis. The outer walls are formed with a series of orifices which [50] Field of Search 431/1 14, comprise equally spaced apart rows of orifices, positioned in straight lines that are parallel to the central axis ofthe walls.

PATENTEU JUL 1 3 ran INVENTORS ROSS FORNEY KURT s JAEGER ATTORNEY FIG. 3

BURNER NOZZLE TIP BACKGROUND OF THE INVENTION In the operation of power-generating systems it is important to obtain uniform burning of the fuel in is burner section of the steam generator. Accordingly, it has been common practice to mount a series of burners along the periphery of the furnace. One of the more common type of burner systems is the combined oil and gas fired unit in which oil is fed through the center of the burner and gas is fed through a coaxial, annular outer chamber. The gas-firing system has presented a problem in that severe vibration has been experienced during normal operating conditions. This vibration generally occurs close to burner tip, it is possible to counteract the vibration. It has been found that the outer orifices of the present invention result in the ignition point of the gas being brought back closer to the surface of the nozzle tip, and the center of the flame becomes much richer. Thus, in accordance with the present invention a sufficient change occurs in the initial combustion zone of the flame to radically change the resonant frequency of the flame and thereby reduce the vibration created by the burner.

SUMMARY OF THE INVENTION In accordance with an illustrative embodiment demonstrating features and advantages of the present invention, there is wall connected to a cylindrical outer wall. The end wall has a series of end orifices which have axes that are substantially perpendicular to the plane of the end wall. The outer wall is formed with a series of outer orifices which have axes that are substantially perpendicular to the plane of the outer wall. There is also provided means for introducing a combustible gas to the annular chamber, and means for igniting the gas passing through the orifices. Thus, the combustion of the gas emerging from the end orifices and the outer orifices reduces vibration in fuel burner.

BRIEF DESCRIPTION OF THE DRAWINGS The above brief description, as well as further objects, features and advantages of the present invention will be more fully appreciated by reference to the following detailed description of a presently preferred but nonetheless illustrative embodiment in accordance with the present invention, when taken in connection with the accompanying drawings wherein:

FIG. I is a perspective view of a gas burner in which the nozzle tip of the instant invention is employed;

FIG. 2 is an enlarged elevational view of the nozzle tip removed from the burner shown in FIG. 1. with portions being broken away and sectioned to illustrate the axes of the end orifices and outer orifices of the nozzle tip; and

FIG. 3 is an enlarged elevational view of a portion of the burner shown in FIG. i with portions broken away and sectioned to show connection of the nozzle tip to the burner.

DESCRIPTION OF THE PREFERRED EMBODIMENT With reference to FIG. 1, in accordance with the present invention there is provided a fuel burner generally designated by the reference numeral which is shown completely removed from its operating environment in a vapor generator. For the sake of simplicity the means for introducing a combustible gas into the burner 10 has been shown schematically by an arrow which is designated G and likewise the means for introducing oil through the center of the burner 10 is shown by an arrow which is designated by the letter 0. Also, the means for igniting the gas, as well as the means for igniting the oil, are not directly shown in the drawings, as these are well known in the art.

The burner 10 includes a cylindrical conduit 12 which is coaxially mounted in a cylindrical guide tube 14, with a flange port I6 being connected in flow communication at the end of the conduit 12 for receiving the gas 0. An end port 18 is gas G exteriorally drawings.

As best shown in FIG. 3, the conduit [2 includes a cylindrical inner wall 20 spaced apart from an outer wall 22, with

walls

20 and 22 being joined together by a nozzle tip 24 to form an annular gas chamber 26. The nozzle tip 24 includes a frustoconical end wall 28 which is integrally formed with a cylindrical outer wall 30, and a cylindrical inner wall 32. The

walls

30 and 32 are joined together by welds 34, thereby completing the annular gas chamber 26. The

inner walls

20 and 32 define an inner guide conduit 36 which is connected to the end port 18 for passing the oil gun 0 through the burner.

As best shown in FIG. 2, the frustoconical end wall 28 is formed with a series of end orifices 40 which have axes that are substantially perpendicular to the plane of orifices 42 which have axes that are substantlally perpendicular to the plane of the outer wall 30. By referring to FIG. 2 it can be seen that the axis of outer orifice 42 which is designated A-A is not parallel to the axis of end orifice 44 which is designated B-B. Accordingly, the angle subtended between axis A-A and B-B, which has been designated 8, is less than The end orifices 40 and outer orifices 42 are formed in rows which are designated 50 and are positioned along the outer surface of end wall 28 and outer wall 30, parallel to the central axis of cylindrical conduit 12. Thus, the force exerted by the combustion of jets of gas, passing through end orifice 40 and outer orifice 42, respectively tend to counteract one another. Another factor in reduction of vibration in the radical change in the resonant frequency of the flame of burner 10.

A latitude of modification, change and substitution is intended in the foregoing disclosure and in some instances some features of the invention will be employed without a corresponding use of other features. Accordingly, it is appropriate that the appended claims be construed broadly and in a manner consistent with the spirit and scope of the invention herein.

We claim:

I. A fuel burner capable of combusting a fuel comprising a conduit including an inner tube wall and spaced apart essentially uniform outer tube wall joined together at a tip section section including a frustoconical end wall section integrally connected to a cylindrical wall section, said end wall section having a series of end orifices which have axes that are substantially perpendicular to the plane of said end wall section, said cylindrical wall formed with a series of outer orifices which have axes that are substantially perpendicular to said central axis, said end orifices and outer orifices forming rows of orifices including at least one of said end orifices and at least one of said outer orifices and said rows of orifices being positioned in straight lines along the outer surface of said conduit, parallel to said central axis, and said rows of orifices being equally spaced apart along the periphery of said conduit and means for introducing said fuel to said gas chamber, such section slopes inwardly from said cylindrical wall section such that an angle is subtended between the centerlines of the axes of the end orifice and outer orifice in each of said rows which is less than

Claims

1. A fuel burner capable of combusting a fuel comprising a conduit including an inner tube wall and spaced apArt essentially uniform outer tube wall joined together at a tip section to form an annular gas chamber having a central axis, said tip section including a frustoconical end wall section integrally connected to a cylindrical wall section, said end wall section having a series of end orifices which have axes that are substantially perpendicular to the plane of said end wall section, said cylindrical wall formed with a series of outer orifices which have axes that are substantially perpendicular to said central axis, said end orifices and outer orifices forming rows of orifices including at least one of said end orifices and at least one of said outer orifices and said rows of orifices being positioned in straight lines along the outer surface of said conduit, parallel to said central axis, and said rows of orifices being equally spaced apart along the periphery of said conduit and means for introducing said fuel to said gas chamber, such that the gas passes through said end orifices and said outer orifices whereby jets of ignited gas from said outer orifices counteract the forces created by jets of ignited gas from said end orifices to reduce vibration in said fuel burner.

2. A fuel burner according to claim 1 in which said end wall section slopes inwardly from said cylindrical wall section such that an angle is subtended between the centerlines of the axes of the end orifice and outer orifice in each of said rows which is less than 90*.