US 3118493 A
Description (OCR text may contain errors)
Jan. 21, 1964 A. T. WALSTAD 3,113,493
GAS BURNER ASSEMBLY WITH ADJUSTMENT FDR GAS QUALITY Filed June 6, 1958 INVENTOR ALVIN 7'. WALSTAD 53 Attorney United States Patent 3,118,493 GAS BURNER ASSEMBLY WITH ADJUSTMENT FUR GAS QUALITY Alvin T. Walstad, Gary, Ind., assignor to United States Steel (lorporation, a corporation of New Jersey Filed June 6, 1958, Ser. No. 740,464 2 Claims. (Q1. 158-109) This invention relates to a burner assembly and more particularly to a burner for use in the early heating stages of billet heating furnaces consisting of a series of barrel type chambers such as shown in Hess Patent No. 2,638,333, dated May 12, 1953. In burners previously used for this purpose most of the heat is provided by radiation. The heating rate of the previous burners was comparatively slow and the cost of the burners relatively high.
It is therefore an object of my invention to provide a burner assembly which will provide both convective and radiant heat.
Another object is to provide a burner assembly so constructed that the burner tip is located out of the radiation zone.
Still another object is to provide a burner assembly which is so constructed that there is little scale deposited within the furnace chamber.
A still further object is to provide a low-cost burner assembly which can be readily cleaned, replaced and adjusted.
These and other objects will be more apparent after referring to the following specification and attached drawings, in which:
FIGURE 1 is a cross section of a barrel type billet heating furnace with the burner assembly incorporated therein;
FIGURE 2 is a sectional view showing the details of the burner assembly;
FIGURE 3 is an enlarged view showing the burner tip;
FIGURE 4 is a view taken on the line lV-IV of FIG- URE 3;
FIGURE 5 is a view, similar to FIGURE 3, showing a second embodiment of the burner tip; and
FIGURE 6 is a View taken on the line VL-VI of FIGURE 5.
Referring more particularly to the drawings, reference numeral 2 indicates the heating chamber of a furnace. An opening 4 is provided at each end of the furnace chamber 2 through which billets B enter and leave the chamber 2. The chamber 2 is surrounded by a refractory wall 6 having a clean-out hole 6 through the bottom thereof and a vent hole 10 through the top thereof. A metal shell 12 surrounds the refractory 6 and insulation 14 may be provided between the metal shell 12 and the refractory 6 where desired. Four burner tunnels 16 also extend through the refractory lining 6 and metal shell 12. A refractory ring 18 is provided on the outside of the furnace at each burner tunnel 16 and is surrounded by a burner mounting 26 which has an opening for receiving a pipe 22. The pipe 22 passes through an opening in a mounting plate 24 which is attached to the burner mounting 26 in any suitable manner. An asbestos gasket 26 is provided between the mounting 20 and plate 24. A pipe T 2.8 is threaded on the pipe 22. One run of the T 28 is connected to a nipple 30 which in turn is connected to an air supply manifold 32 by means of an angle 34 and flexible connector 36. A standard packing gland 38 is mounted in the other run of T 28. A pipe 46 passes through the gland 33. A burner tip 42 is threaded on the end of pipe 40 within the pipe 22. The outer end of pipe 4t is connected to a fuel gas manifold 44 by means of nipples 46 and 48, flexible connector 5t),
3,118,493 Patented Jan. 21, 1964 elbows 52 and pipe 54. The pipe 54 passes through a standard packing gland 56 and a coupling 58 into a pipe nipple 66 which is attached to the manifold 44. The burner tip 42 consists of a hollow body member 62 having internal threads 64 at its outer end and a closed inner end 66. A plurality of holes 68 are provided through the closed end 66. The closed end of the body member 62 is frusto-conical with the inner and outer walls thereof being parallel. The angle A of the cone is preferably 118". The axes of the holes 68 are perpendicular to the walls of the inner end 66. Three fins 70 are welded to the outside of the body 62. The fins '76 extend longitudinally of the burner tip 42 at an angle of preferably 45 with the axis of the burner tip 42. The fins 70 extend from the body portion 62 to the inner wall of the pipe 22 so that the tip 42 is centered in the pipe 22. Those parts of the assembly subject to heat are preferably made of a heat resistant steel alloy. Gaskets may be provided throughout the assembly where deemed desirable.
FIGURES 5 and 6 show a slight modification of the burner tip in which four fins 72 are used instead of three fins. The fins 72 are arranged longitudinally of the burner tip at an angle of approximately l4 /2 to the axis of the burner tip.
The operation of the burner is as follows:
Air, oxygen or a mixture thereof travelling at a high velocity passes into the pipe 22 around the pipe 40. Fuel gas passes through the pipe 4% into the burner tip 42 and out through the holes 68. The fins 76 or '72 create turbulence in the air. This turbulence causes intimate mixing of the air and gas in the burner tunnel 16 and also results in a turbulent flow of the products of combustion in the furnace chamber 2. The products of combustion sweep over the billets B so that the billets are heated by this convective heat as well as by radiant heat from the walls of the chamber 2. The direct impingement of the hot combustion gases on the cold billets B also provides an effective method of removing scale from the billets. The scale dropping from the billets has a free fall through the clean-out opening 8 which tends to reduce the amount of buildup on the refractory lining directly above cleanout opening 8.
The arrangement of the glands 38 and 56 permits quick and easy adjustment of the emersion depth of gas tip 42 within the tunnel 16 to get the best mixing and combustion regardless of the type of gas used.
By loosening gland 56 and removing gland 38 the complete assembly may be easily removed for cleaning, repairs, or replacement without disturbing the main mounting assembly.
While two embodiments of my invention have been shown and described it will be apparent that other adaptations and modifications may be made without departing from the scope of the following claims.
1. A burner assembly comprising a first conduit having a substantially uniform inside diameter, a T attached to the rearward end of said first conduit and having a threaded opening in axial alignment with said first conduit and a side inlet, means for delivering oxygen containing gas to said side inlet, an axially movable burner tip mounted within said first conduit adjacent the forward end thereof, a plurality of fins mounted on the outside of said burner tip and extending substantially to the inner wall of said first conduit, said fins extending longitudinally of said burner tip at an angle to the axis thereof, a packing gland supported in said threaded opening, a second conduit extending through said packing gland, said T and said first conduit, means attaching said burner tip to said second conduit, a fuel container having a second threaded opening therein, a second packing gland supported in said second threaded opening, a third conduit generally parallel to said second conduit mounted in said second packing gland, and a fourth conduit connecting said second and third conduits, said second and third conduits being axially movable in their associated packing glands so as to position said burner tip at the desired axial position.
2. A burner assembly comprising a tunnel, a first conduit of smaller diameter than said tunnel leading into said tunnel, said conduit having a substantially uniform inside diameter, a T attached to the rearward end of said first conduit and having a threaded opening in axial alignment with said first conduit and a side inlet, means for delivering oxygen containing gas to said side inlet, an axially movable burner tip mounted within said first eonduit adjacent the forward end thereof, a plurality of fins mounted on the outside of said burner tip and extending substantially to the inner wall of said first conduit, said fins extending longitudinally of said burner tip at an angle to the axis thereof, a packing gland supported in said threaded opening, a second conduit extending through 4 said packing gland, said T and said first conduit, means attaching said burner tip to said second conduit, a fuel container having a second threaded opening therein, a second packing gland supported in said second threaded opening, a third conduit generally parallel to said second conduit mounted in said second packing gland, a fourth conduit connecting said second and third conduits, said second and third conduits being axially movable in their associated packing glands so as to position said burner tip at the desired axial position.
References Cited in the file of this patent UNITED STATES PATENTS 982,836 Ley et al Jan. 3], 1911 1,352,351 Byers Sept. 7, 1920 1,493,584 Wills May 13, 1924 2,183,596 Trinks Dec. 19, 1939 2,276,131 Wiant Mar. 10, 1942 2,855,033 Furczyk Oct. 7, 1958