US2822768A

US2822768A - Chogles j

Info

Publication number: US2822768A
Authority: US
Publication date: 1958-02-11
Anticipated expiration: 1975-02-11

Description

Feb. 11, 1958 c. J. BARKLEY METALLIC SKEWBACK FOR FURNACE ROOFS Filed Jan. 22, 1953 Inventor- CHflPZf? 1549a 05 United Charles J. Barkley, Orem, Utah, assignor to United States Steel Corporation, a corporation of New Jersey Application January 22, 1953, Serial No. 332,645 1 Claim. (Cl. 110-99) This invention relates to a metallic skewback for sprung arch refractory roofs and especially to such skewbacks for use on open hearths and other heating furnaces. In an open hearth furnace the front part of the roof is ordinarily arranged so that the skewback is in substantially a single plane. This is not true of the back part of the furnace since the furnace has a maximum width at the main laboratory section of the furnace and gradually decreases in width through the transition portion to the knuckle portion of the furnace roof. The Width remains the same from the knuckle portion to the end of the furnace but the height of the roof increases between the knuckle portion and the roof over the ports. The usual support for the arched roof consists of a water cooled skewback beam fastened to the inside of the bnckstays which supports special shaped skewback bricks. A large number of different shapes of skewback bricks are required in the transition and sloping portions of the roof. This requires stocking a great number of special shapes which is an expensive proposition and requires a great deal of storage space. Since the skewback bricks have special shapes which vary with the span, rise and radius of the refractory arch, they are more expensive than bricks of standard shape. The use of water in close proximity to the heated refractory is objectionable since the water sometimes comes in contact with the heated refractory bricks causing them to spall. This makes it necessary to take the furnace out of production until the damage is repaired. Since the standard skewback beam is close to the intense heat of the furnace it is normally necessary to replace it after each campaign of a furnace roof. Since the roofs require the use of bricks of various shapes in the confined space between the top and bottom flanges of the usual skewback beam the work of repairing the roof is slow. Since the skewback bricks are located above the refractory walls of the furnace and since this is a common place of failure it often becomes necessary to replace the brick work at this point before the vertical wall burns through to the danger point.

It is therefore an object of my invention to provide an air cooled metallic skewback for refractory brick sprung arches which eliminates the use of special skewback bricks and protects the skewback beams from the heat of the furnace.

This and other objects will be more apparent after referring to the following specification and attached drawings, in which:

Figure 1 is a plan view of an open hearth furnace; and

Figure 2 is an enlarged sectional view taken on the line II-Il of Figure 1.

Referring more particularly to the drawings, reference numeral 2 indicates a section of a heating furnace such as an open hearth furnace. The furnace 2 has two vertical refractory brick walls 4 and a sprung arch 6. As shown the arch is a ring arch, but the invention is equally applicable to bonded or ribbed arches. Buckstays 8 and 10 are provided on each side of the furnace and extend up- Pate G wardly along the side walls. The bnckstays 8, which in the open hearth furnace shown are located in the main laboratory portion of the furnace, have a portion 12 thereof bent outwardly and upwardly from the adjacent side walls. A beam 14 extends between adjacent buckstay 8 along the side wall 4 and is positioned entirely outside of the side wall. The ends of the beams 14 are attached to the bnckstays 8 by means of a bracket 16 which may be T or angle shaped. As shown the beam 14 is an H-beam having one half of its outer flange 17 cut away and the other flange 18 arranged at substantially the same angle as the inner face of the bent portion 12 of the bnckstays 8. The flanges 17 and 18 are connected by a Web 19. A steel skewback plate 20 is fastened to the flange 18 preferably by means of bolts 20b. It will be seen that the plate 20 extends upwardly and outwardly at an angle from a point adjacent the top outside face of the adjacent refractory wall 4. A rod 21 is welded to the bottom of each of the plates 20 at the spring line of the arch. Refractory bricks 22 of standard shape may be used to make up the entire arch 6 with the bottom of the first of said bricks resting on the rod 21. Since the skewback beam 14 is completely outside of the furnace and since the arch 6 begins at the outside face of the wall 4 it is possible for the walls 4 to burn almost completely through before leakage occurs between the walls and the arch. This is not true in the usual furnace construction. The beam 14 will not be damaged by heat and it is normally necessary only to replace the plate 20 which protects the beam 14 from damage.

While one embodiment of my invention has been shown and described it will be apparent that other adaptations and modifications may be made without departing from the scope of the following claim.

I claim:

In a furnace having spaced refractory sidewalls and a sprung refractory arch extending between said sidewalls; the improvement comprising spaced apart bnckstays extending upwardly along one of said sidewalls, said buckstays having a portion thereof bent outwardly and upwardly from said sidewall, a beam extending between and fastened to said bnckstays and positioned entirely outside of said sidewall, a flange on said beam arranged at substantially the same angle as the inner face of the bent portion of said buskstays, a web on said beam extending normal to said flange and outwardly therefrom, said web being located intermediate the top and bottom of said arch, said flange and web being exposed to the surrounding air, a protective skewback plate fastened to said flange and extending upwardly and at least to the outward extremity of said flange and outwardly at an angle from a point adjacent the top outside face of the adjacent refractory wall in substantially the same plane as the inner face of the bent portion of said bnckstays.

McFeaters Aug. 8, 1950 U. S. DEPARTMENT OF COMMERCE I PATENT OFFICE CERTIFICATE OF CORREC TION Patent No, 2,822,768 February 11, 1958 Charles Jo Barkley It is hereby certified that error appears in the printed specification ofthe above numbered patent requiring correction and that the said Letters Patent should read as corrected below Column 2, line 50, after "upwardly" insert and. outwardly line 51, strike out "and outwardly,

Signed and sealed this 1st day of April 1958,

(SEAL) Attest:

ARL H, AXLINE ROBERT C. WATSON Attesting Officer Conmissioner of atents