US2563683A

US2563683A - Gas burner for soaking pit furnaces and the like

Info

Publication number: US2563683A
Application number: US646157A
Authority: US
Inventors: Thomas W Lewis
Original assignee: United States Steel Corp
Current assignee: United States Steel Corp
Priority date: 1946-02-07
Filing date: 1946-02-07
Publication date: 1951-08-07
Anticipated expiration: 1968-08-07

Description

Aug' 7 1.951 T. w. I Ewls 2563683 GAs BURNER FOR soAKING PIT FURNACES AND THE LIKE `Filed Feb. 7, 1946 i "HNR l lllllul wml INVENTORZ His ATTORNEY.

Patented Aug. 7, 1951 GAS BURNER FOR SOAKING PIT FURNACES AND THE LIKE Thomas W. Lewis, Munhall, Pa., assignor to United States Steel Company, a corporation of New Jersey Application February 7, 1946, Serial No. 646,157

1 Claim. 1

This invention relates to improvements in burners for the combustion of hydro-carbonaceous fuels for heating soaking pit furnaces and the like.

In some types of bottom-fired soaking pit furnaces, the fuel, such as coke oven gas, is supplied thereto from a vertical pipe through a port centrally located in the bottom of the heating chamber. Surrounding the fuel pipe, there is provided an annular column of preheated air which provides oxygen for delayed combustion, and forms a long flame which rises to the top of the chamber where it is deflected outwardly and downwardly to pass between and around the ingots on the furnace hearth. The products of combustion exit from the chamber through ports located just above the hearth and are then passed through heat exchangers, such as recuperators, to preheat the incoming air. From the foregoing, it is seen that the efficiency of the furnace depends on the thoroughness with which the air and gas are mixed.

Accordingly it is an object of this invention to provide a burner for soaking pit furnaces and the like which permits more efficient operation of the furnace.

It is a further object to provide a burner for soaking furnaces which efliciently mixes the fuel and preheated air and by causing a maximum of turbulence, produces a flame of maximum luminosity and temperature.

The foregoing and further objects will become apparent from the following specification when read in conjunction with the attached drawing, wherein:

Figure l is a vertical section showing the burner. port and a portion of the hearth of a bottom-fired soaking pit furnace;

Figure 2 is an enlarged plan view of the burner; and

Figure 3 is a sectional elevation taken on line III-III of Figure 2.

Referring more particularly to the drawing, the numeral 2 designates a bottom-fired soaking pit furnace having a hearth 4 with a centrally located port E therein. Heated air from suitable recuperators or heat exchangers (not shown) is supplied to the relatively large port 6 and burner 8 disposed therein through conduits I which are used alternately. Fuel is supplied to the burner through a pipe I2.

The burner 8 of my invention is disposed at the upper end of pipe I2 so that it is centrally located in the port 6. The burner consists of a hollow cap I4 in the form of an inverted frustum of a cone having a closed lower end I6, the upper end of which is iiush with the end of the pipe I2. The cap I4 is welded or otherwise secured to the pipe and has a plurality of vertical elongated slot-shaped openings i8 suitably spaced around the sloping sides thereof. The

slope of the sides and the openings are arranged to permit converging streams of gas to pass through the cap and meet at the center and near the top of the cap. The size and shape of the openings I8 is such that the maximum velocity of the streams for the required fuel rate is obtained. Due to the increased fuel velocity and, by the impinging of these gas streams one on another at the point of convergence, a great turbulence and breaking up of the gas streams is produced prior to mixing with the air supply thus effecting more intimate and effective mixing which in turn produces greater combustion efficiency and results in a flame of greater luminosity and temperature.

This burner and method of preheating the gaseous fuel prior to mixing with the air supply has resulted in a saving of two to three hours in the time required to heat ingots.

While I have shown and described one specific embodiment of my invention, it will be understood that this embodiment is merely for the purpose of illustration and description and that various other forms may be devised within the scope of my invention. as defined in the appended claim.

I claim:

In combination, a furnace which includes'a chamber having a bottom wall formed with a port, conduits underneath said chamber for supplying preheated air to said port, and a pipe extending into said port and terminating below said chamber for supplying gaseous fuel thereto; a burner which comprises a cap mounted in the exit end of sald pipe and being in the shape of an inverted frustum of a cone having a closed bottom and sloping side walls, said bottom being disposed interiorly of said pipe, said sloping side walls having a plurality of pairs of oppositely disposed openings of elongated outline with their elongated dimensions being in the direction of slope of said side Walls, whereby said openings direct streams of gaseous fuel issuing therefrom under pressure to a point of convergence at the center line of the pipe near the top of the cap.

THOMAS W. LEWIS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 502,710 Ferguson Aug. 8, 1893 2,297,696 Elder Oct. 6, 1942 FOREIGN PATENTS Number Country Date 23,217 Great Britain of 1903 19,073 Great Britain of 1914 106,654 Switzerland Oct. 16, 1924