US2480255A - Burner for soaking pit furnaces and the like - Google Patents

Description

30, 1949. E. T. MORTSON ETAL 2,480,255

BURNER FOR SOAKING PIT FURNACES AND THE.LIKE

Filed Oct. 10, 1945 Fuai Fuzz.

if 22/ 4'0 16 if) Patented Aug. so, 1949 Emmons T. Mortson, Pittsburgh, and Milton L. Bobeng, McKeesport, Pa., assignors to National Tube Company, a corporation of New Jersey Application October 10, 1945, Serial No. 621,474

6 Claims. (01. 158-99) v This invention irelates to improvements in burners for the combustion of hydro-carbonaceous fuels for heating soaking pit furnaces and v the like.

In a recent design of, soaking pit furnace, the

furnace is fired or heated from one centrally cated burning port in the hearth of the pit through which the flame is upwardly directed into the soaking pit proper. The velocity of the combustible mixture leaving the burning port is sufliciently low to insure a soft, radiant flame which is diffused throughout the primary combustion chamber and pit by turbulence and 'convection. The ingots arranged in a single row around the burning port form the primary oomhustion chamber throughout the height of the ingots with the maximum thermal input in the area of greatest cross section of the ingots. The prodnets of combustion are removed through a plurality of outlets at the lowest practical level through the end walls forming the pit. The burners heretofore used in such furnaces have beeirunsatisfactory due-to burning away rapidly and thereby becoming very inefficient due to the i improper distribution of the heat therefrom, and

in addition causing serious damage to the port and structural underframe of the furnace due to overheating.

It is accordingly an object of the present invention to overcome the foregoing disadvantages and provide a burner that is efficient and durable in operation.

It is a further object of the present invention to increase the efiiciency of soaking pit furnaces and reduce the outage time required for rebuilding ports, cleaning slag and cinder from the burner port and for repairing the structural or supportin framework.

The foregoing and further objects will be apparent from the specification and drawing, wherein:

Figure 1 is a vertical section showing the burner assembly, port and a portion of the hearth of a soaking pit furnace; and

Figure 2 is an enlarged vertical section on line 11-11 of Figure 1.

Referring more particularly tothe drawing, the numeral 2 designates a soaking pit furnace for heating steel ingots having a hearth l with a centrally located port 6 therein. Heated air from suitable regenerators or recouperators (not shown) is supplied to the port 6 and burner assembly 8 disposed therein through conduits H) which are used alternately.

The burner assembly 8 of our invention comprises a tubular nozzle I 2 composed of bonded refractory such as silicon carbide which is disposed in vertical endwise position on a reducing flange II- on the upper end of a gas tube It having a slightly larger outside diameter than the refractory nozzle l2. Also mounted on the reducing flange I4 is an adapter or nipple l8 having an outside diameter such that a close sliding fit withthe interior of the refractory nozzle i2 is obtained. A flange 2m is mounted on the lower end of the gas tube It with a gas tight connection provided by a gland 22. A cylindrical supporting bracket 24 for the burner assembly telescoped therein is welded as at 26 to the port bosh 28 and has a flange 30 welded as at 32 or otherwise suitably secured to its lower end and mountwhich is filled with a high temperature silica sand insulation 35. The tubular jacket 34 is provided with a gas-tight flt or seal at its lower end by means of a plastic seal 36 interposed between the end of the tubular Jacket 34 and the supporting flange 2B. A similar seal 38 is placed between the refractory nozzle l2 and the gas pipe It.

A flange I0 is welded as at 42 or otherwise suitably secured to the lower end of the gas pipe 16 and is connected by bolts 44 to flange 30. Thus by adjusting nuts 46 of the bolts 44, vertical adjustment of the burner assembly and the upper end of the nozzle I2 with respect to port 6 may be secured.

The flange 40 is secured to a fitting 50 at the end of a gas main 52 connected to a source of gas under suitable pressure. Fitting 50 has removable cover members 54 and 56 which provide ready access to the interior of'the fitting for inspection or cleaning of the refractory nozzle l2 and the gas main 52. To repair or remove the burner assembly, it is merely necessary to disconnect the flange 0 from the fitting 50, and remove the nuts 48 to drop the burner assembly to a position where the parts thereof are readily accessible.

The bosh 28 is covered with a suitable pavement 60 composed of brickwork or the like so that the outer or supporting P p is firmly embedded therein. This affords lateral support for the pipe and at the same time maintains its po- It is understood that the diameter of the nozzle and the adapter I! are proportioned in accordance with the type of gas available and the pressure of the gas coordinated with the-inside diameter of the nozzle l2 and adapter to give the desired flame in the port 6. a

While we have shown and described one speciflc embodiment of our invention, it will be un-,

derstood that this embodiment is merely for the purpose of illustration and description and that various other forms may be devised within the scope of our invention, as defined in the appended claims.

We claim:

1. A burner for soaking pit furnaces and the like comprising a gas tube connectible to a source of gas under pressure, a bonded refractory nozzle connected to said gas tube in alignment therewith, a tubular jacket disposed around said gas tube and said refractory nozzle with an annular space therebetween, said annular space being filled with insulating material.

2. A burner for soaking pit furnaces and the like comprising a gas tube connectible to a source of gas under pressure, a bonded refractory nozzle connected to said gas tube in alignment there-.

with, an adapter disposed interiorly of said refractory'nozzle carried by said gas tube, a, tubudisposed in endwise relation to said gas tube, an

adapter having a slightly smaller outside diameter than the inside diameter of said refractory nozzle disposed at the end of said gas tube interiorly of said refractory nozzle to provide interior support for said refractory nozzle and means for supporting the exterior of said refractory nozzle.

4. A burner for soaking pit furnaces and the like comprising a gas tube connectible to a, source of gas under pressure, a reducing flange on said gas tube, a bonded refractory nozzle mounted on said reducing flange in alignment with said gas tube, an adapter having a slightly smaller outside diameter than the inside diameter of said refractory nozzle disposed on said reducing flange interiorly of said refractory nozzle to provide interior support for said refractory nozzle and means for supporting the exterior of said refractory nozzle.

inside diameter of said refractory nozzle dis-- posed on said reducing flange interiorly of said refractory nozzle to provide interior support for the lower end thereof and a tubular jacket mounted around said gas tube and said refractory nozzle with an annular space therebetween. said annular space being filled with an insulating material to provide support for the exterior of said refractory nozzle throughout the major portion of its length.

6. A burner for soaking pit furnaces and the like comprising a gas tube connectible to a source of gas under pressure, a bonded refractory nozzle disposed in alignment with said gas tube, a reducing flange intermediate the gas tube and the refractory nozzle, an adapter mounted on said reducing flange and disposed interiorly of said refractory nozzle. said adapter having a close sliding fit with the interior of said refractory nozzle to provide interior support therefor and means for supporting the exterior of said refractory nozzle.

EMMONS '1'. MORTSON. MILTON L. BOBENG.

REFERENCES orrEn The following references are of record in the

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