US2591283A

US2591283A - Radiant work heating gas burner

Info

Publication number: US2591283A
Application number: US122980A
Authority: US
Inventors: John D Nesbitt; Henry W Schramm
Original assignee: Surface Combustion Corp
Current assignee: Surface Combustion Corp
Priority date: 1949-10-22
Filing date: 1949-10-22
Publication date: 1952-04-01
Anticipated expiration: 1969-04-01

Description

Patented Apr. 1, 1952 RADIANT WORK HEATING GAS BURNER John D. Nesbitt,

Sylvania,

and Henry W.

Schramm, Toledo, Ohio, assignors to Surface Combustion Corporation, Toledo, Ohio, a corporation of Ohio Application October 22, 1949, Serial No. 122,980

4 Claims.

This invention relates to high temperature heating apparatus of the type comprising elongate work heating burners adapted to be arranged in spaced facing relation to provide between their facing sides a high temperature heating zone wherethrough work pieces may be passed for rapid heating to elevated temperature; and the general object of the invention is to provide a burner construction that shall be well adapted to withstand the elevated temperatures that must necessarily prevail in the heating zone between the burners.

For a consideration of what we consider to be novel and our invention, attention is directed to the following specification and the claims appended thereto.

In the drawings,

Fig. 1 is a miniature view in longitudinal side elevation of a heating apparatus embodying the burners of the present invention.

Fig. 2 is a fragmentary isometric view of one end of a-pair of the improved burners which are embodied in the heating apparatus shown in Fig. l. 1

Fig. 3 is a plan view of the heating side with parts in section of the improved burner and illustrating how the burners may be supported between supporting standards.

Fig. 4 is a vertical transverse sectional view of the improved burner.

Fig. 5 is a fragmentary plan and sectional View of a detail of the burner.

Fig. 6 is an isometric view of one end of a mandrel used in forming the burner combustion tunnel.

An application of the improved burners is schematically indicated in Fig. 1. In this view two of the burners l and l l are arranged in vertically spaced relation with their heating sides facing each other to define between said sides a high temperature heating zone through which elongate forging stock l2 disposed crosswise of said zone may be advanced from one end to the other of said zone by appropriate guiding means l3. As best shown, in Fig. 3, the two burners may be maintained in fixed spaced relation by supporting structure comprising lateral brackets M at both ends of each of said burners for attachment to upright supporting standards shown in outline. The two burners are of identical construction and therefore a detailed description of one will apply to both.

Each burner comprises a slot-type combustion tunnel H in a relatively massive elongate refractory block I6 which is closely confined in an open top metal box l9 to constitute a refractory liner within the box. The bottom wall, the side walls and the end walls of the box are respectively identified by

reference numerals

28, 24 and 34. The block [6 will ordinarily be made in the box l9 itself from a castable mix of refractory material, and the tunnel I! will ordinarily be formed in the mix by a mandrel 26 placed in the box before the mix is placed therein and removed therefrom after the mix has set. The hardened mix is permanently held in place in the box [9 by holding members 25 already in the box before the refractory mix is placed therein, said members each preferably comprising an angled strip of expanded or perforated metal spot welded at its longitudinal edges to the side walls of the box.

For the major portion of its length, the facing sides of the tunnel H are preferably parallel to each other and thereafter diverge rather sharply as indicated at Hi to provide surfaces from which hea s radiated to the work in the heating zone between facing burners, it being understood that the work will also be heated by the highly heated combustion products issuing from the combustion tunnel. The fuel to be burned in the combustion tunnel will ordinarily consist of fuel gas which has been admixed with its full complement of air for complete combustion before being introduced into said tunnel in the manner presently appearing.

An elongate gas nozzle 20 extends through the bottom wall 28 of the box IS in longitudinal alinement with the adjacent end of the combustion tunnel ll, the nozzle extending from a longitudinally extending fuel supply header 22 welded to said wall 28 at opposite lateral sides said nozzle to form a fluid tight joint where the nozzle, extends through said wall. The nozzle 20 will ordinarily consist of a plurality of rows of drilled ports 2| of which the ports in the outer rows will ordinarily be drilled at an angle inclined towards the adjacent boundary surface of the tunnel so that the gas issuing from the inclined ports will wipe said surfaces and thereby accelerate combustion. Fuel gas already admixed with its full complement of air for complete combustion is delivered under pressure to one end of the fuel supply header 22 by a supply pipe not shown, the other end of the header being closed by an ordinary pipe cap 23.

Due to the high temperature that prevails in the combustion tunnel H, the block 16 as a whole tends to become so highly heated that in the absence of means for cooling the walls of the metal box I9, said Walls tend to overheat and warp.

To prevent such overheating and warping, the box 19 is surrounded by a jacket casing 21 to provide a water jacket 30 about said box. The jacket casing 21 also extends about the fuel supply header 22 whereby the fuel nozzle 20 is indirectly maintained relatively cool by conduction of heat to the relatively cool wall of said fuel supply header.

The lower portion of the jacket casing 21 (as' viewed in Fig. 4) is welded water tight to the lower side of the fuel supply header 22 and since the latter is alsowelded water tight to the bottom Wall 28 of the box l9, the header divides the lower portion of the water jacket into right and left hand portions and of course also imparts rigidity to the burner structure as a whole. That portion of the water jacket at the ends of the box I9 is divided into right and left hand portions by a bafile plate 35 which extend between the end wall 7 33 of the jacket casing 27 and the end wall 34 of the box l9. Cooling water from a source of supply enters one of the half portions of the water jacket through a pipe inlet 36 at one end of the jacket casing 21 and thence flows to the opposite end of said one portion and thence out through a pipe outlet 31 and thence through a cross pipe 48 to a pipe inlet 4! for the other half portion of the water jacket and thence to the opposite end of the latter and thence to Waste through a pipe outlet 42. a

- To protect the heating side of the refractory block from abrasion by the work being heated elevated Wear rods 3! are welded to and constitute'part of the connection between the adjacent edges of box side wall 24 and of the jacket casing side wall. The wear rods 3| preferably extend a short distance beyond the end walls 33 of the jacket casing 21 so that they may be readily alined, if so desired, with work supporting guide rails not shown leading to and from the heating A burner constructed as herein shown and described is particularly Well adapted to Withstand the severe temperature conditions to which it is normally exposed.

What we claim is:

1. In a gas burner, incombination, a bottom wall, end walls, and parallel side walls together defining an elongate open-top metal box, a one piece refractory block cast in said box in contact with the interior surfaces of said box and having a longitudinally extending slot-type combustion chamber extending from top to bottom centrally of said block, mean including a passage disposed along the back side of said bottom wall and communicating through said bottom wall for supplying combusti le mixture to said combustion chamber, and a metallic body embedded in said block at each side of said combustion chamber and anchored to the adjacent side wall of said box for reinforcing said block and tending to hold it in position in said box, said metallic body comprising an elongate strip of sheet metal having a plurality of apertures extending therethrough of a size to permit the mix of which said block is cast to pass freely therethrough.

2. In a gas burner, in combination, a bottom wall, end walls, and parallel side Walls together defining an elongate open-top metal box, a one piece refractory block cast in said box in contact with the interior surfaces of said box and having a longitudinally extending slot-type combustion chamber extending from top to bottom centrally of said block, means including a passage disposed along the back side of said bottom wall and communicating through said bottom wall for supplying combustible mixture to said combustion chamber, a metallic body embedded in said block at each side of said combustion chamber and anchored to the adjacent side wall of said box for reinforcing said block and tending to hold it in position in said box, said metallic body comprising a V-shape strip of sheet metal'having a plurality of apertures extending therethrough of a size to permit the mix of which said block is cast to pass freely therethrough, and the free ends of said strip being welded to the adjacent side wall of said box.

3. In a gas burner, in combination, a bottom wall, end walls, and parallel side walls together defining an elongate open-top metal box, a one piece refractory block cast in said box in contact with the interior surfaces of said box and having a longitudinally extending slot-type combustion chamber extending from top to, bottom centrally of said block, means including a passage disposed along the back side of said bottom wall and communicating through said bottom wall for supplying combustible mixture to said combustion chamber, and a metallic body embedded in said block at each side of said box anchored thereto for reinforcing said block and tending to hold it in position in said box, said metallic body having a plurality of apertures extending therethrough of a size to permit the mix of which said block is cast to pass freely therethrough.

4. In a gas burner, in combination, a bottom wall, end walls, and parallel side walls together defining an elongate open-top metal box, a one piece refractory block cast in said box in contact with the interior surfaces of said box and having a longitudinally extending slot-type combustion chamber extending from top to bottom centrally of said block, mean including a passage disposed along the back side of said bottom wall and communicating through said bottom wall for supplying combustible mixture to said combustion chamber, and elongate metallic bodies extendin inwardly from said walls and spaced from the side walls at least at intermediate portions and imbedded in said block at each-side of said com bustion chamber and anchored to the adjacent side Wall of said box for reinforcing saidblock and tending to hold it in position in said box.

Number Name Date 1,655,936 Brown Jan! 10,1928 2,220,928 Kienleet a1. Nov. 12, 1940 r 2,333,381 Kelly et a1 Nov.-2, 1943 Hess Jan. 25, 1949