US1924938A - Burner construction - Google Patents

Description

Patented Aug. 29, 1933 BURNER CONSTRUCTION Roy A. Lewis, Bethlehem, Pa., assignor to Bethlehem Steel Company, a corporation of Penn- Sylvania Application August 8, 1931.

2 Claims.

My invention relates to improvements in the construction of burners, particularly such burners as are used in the roof of an open hearth furnace, and has for its object the diminution 5 of heat losses in such burners and a simplified construction which will be inexpensive and easily replaced. Further advantages will be made apparent in the following description.

Fig. l is a vertical section through a burner and contiguous portions of the furnace roof.

Fig. 2 is a view of the under side of the deflector of such a burner.

Fig. 3 is a section through the deector taken on the line 3--3 of Fig. 2.

In Fig. 1, l1 represents a portion of the roof of the furnace. 12 is the burner block circular in shape positioned in an opening in the roof of the furnace and pierced with a circular hole 13. It is constructed of refractory material, preferably of a number of individual radial sections fitting together. Surrounding the burner block and projecting above the furnace is the cylindrical chamber 14 lined with refractory material and closed at the top by the cap 15, also lined with refractory material. Through a hole in the center of this cap passes the stem 15 constructed of tubular metallic members 16, 17, 18 and 19 and protected by the refractory tube 20. At its lower end stem 15 carries the circular deflector 21 constructed of a single piece of refractory material. Air for combustion purposes enters through refractory lined duct 21 into chamber 14 and passes through the annular space between the deflector and the burner block and down into the furnace. Liquid fuel enters through supply pipe 22, passes downward through pipe 19 and discharges through an orice 23 at its lower end. A supply of air under pressure enters at 24 passes downward through the annular space between pipes 18 and 19 and is discharged at 25, this air serving to atomize the fuel. The space between pipes 16 and 17 is sealed at top and bottom by rings 26 and 27 and is furnished with proper connections and diaphragms for securing a circulation of water for cooling purposes.

Figs. 2 and 3 illustrate the deilector of such a burner showing its annular construction and the use of slots 28 in the walls of the hole 29. There are in this case four slots which engage With lugs 30 of corresponding shape welded to the outside of the lower end of pipe 16. These lugs serve to support the weight of the defieotor. They are designed to have a long metallic contact with pipe 16 for cooling purposes and to Serial No. 555,959

present as small a surface as possible on their lower faces.

A deector of this type is particularly useful with open hearth furnaces fired by burners in the roof. In such furnaces the charge is likely to be at a very high temperature and the radiation loss due to exposure of water cooled parts is excessive.

The construction here employed reduces such loss to a minimum. The only direct exposure to such radiation is the small area of the ends of pipes 16 and 17, the seal ring 27 and the lugs 30.

At the same time the bottom surface of the deflector which is mainly exposed to such radiation is kept from too great a rise of temperature which would tend to cause cracking and spalling by the passage across its face of the entering air before it has united with the fuel.

particularly apt to absorb heat.

The deflector here illustrated is intended to be of a refractory material of low heat conductivity, which will therefore minimize the heat loss.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. In a burner for an open hearth furnace, a water cooled stem, a plurality of lugs on the outside surface and adjacent the end of said stem, a deflector disk of unitary construction and refractory composition provided with an axial hole closely engaging said stem and enveloping and receiving support from said lugs.

2. In a burner for an open hearth furnace, a water cooled metallic stem, a supporting member attached to the outside surface and adjacent the end of said stem, a deilector disk of unitary construction and refractory composition provided with an axial hole closely engaging said stem and enveloping and receiving support from said supporting member.

ROY A. LEWIS.

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