US1912705A - Metal-heating furnace - Google Patents

Description

June 6,. 1933- J. R. GEORGE METAL HEATING FURNACE Filed May 26, 1932 2 Sheets-Sheet l muenkor )eno'me R. Geoleg' m W June 6, 1933.

J. R. GEORGE 1,912,705

METAL HEAT ING FURNACE Filed May 26, 1952 2 Sheets-Sheet 2 patented June 6, 1933 UNITED STATES PATENT OFFICE E OME R. GEORGE, oEMARro N, MASSACHUSETTS, AssIeNoR T0 MORGAN oons'rRU'e- 1 TION COMPANY, or woRoEs'rE MASSACHUSETTS, A CORPORATION or MASSA- GHUSE'ITS Application .filed may 26,

The present invention relates to metalheating furnaces, particularly those wherein the Waste furnace gases, immediately upon their exit fromthe heating chamber of the furnace, are passed through a recuperator or the like, to secure pre-heating of the airused to support combustion in the furnace. The invention involves a novel disposition of the furnace-charging equip the furnace gases, andthat offers the max imum resistance to the wear resulting from the charging movements of the metal stock received thereon. Other and further ob jects and advantages of the invention will appear from the following detailed description thereof, reference being had in this connection to the accompanying drawings, wherein y Y i Fig. 1 is afragmentary longitudinal sec tional view of the charging end of a metal heating furnace to which my invention is applied. p

i Fig. 2 is a fragmentary plan view sho-W- ingthe charging hearth with certain parts removednear one end. a Fig. 3 is a sectional View on the line 33 of Fig. 2.

Fig. 4: is a large scale sectional View on the line 44 of Fig. 2. v p i i Fig. 5 is a fra mentary sectional'view on the line 5-5 of Fig. 1.

Like reference characters refer to like parts in the different figures.

Referring first to Fig; 1, the invention is shown in connection with a metal heating furnace of the recuperative type, wherein theihot combustion gases, after passing the full length of the heating chamber 1 over the hearth or floor 2 whereonthe stock is supported, are led directly into the tubes3,3 of a recuperator or stove, the latterbeing in the path taken by said gases on their way to the stack, and being disposed immediately adjacent the heating chamber 1 METAL-HEATING FURNACE 1932. Serial No. 613,643.

so as to obtain the transfer to the air that circulates around the tubes 3, 3, of the maximum amount of heat remaining in said gases after their passage through the chamber 1. This recuperator or stove, notwithstanding its immediate proximity to the heating chamber 1, is, according to the present invention, located wholly beyond that portion of the hearth 2 onto which the entering stock is charged, substantially as de scribed in my copending companionapplication Serial No. 456,206, filed May 27, 1930, nowissued as Patent No. 1,888,720, dated November 22, 1932. By this arrangement is avoided any travel of the charged billets or bars over the recuperator or stove, so that the scale or otherforeign matter dropping 05 said billets cannot get into the tubes 3, 3. As shown in Figs. land 2, the side walls of the furnace provide suitable charging openings 4, 4, through which the successive billets or bars are projected endwise onto the receiving portion of the floor or hearth 2. Each bar or billet as so delivered into the furnace is then acted upon by broadside pushers 5, 5, the latter by their successive operations procuring thestep-by-step broadside movement of all the charged billets toward the other or discharge end of the heating chamberlr i r The receiving portion of the hearth or floor 2 is here shown as constituted in part by a pair of hollow metallic boxes 6,6, laid end to end across the furnace inthe charging zone thereof, and suitably supported on extensions 7, 7 of the brickwork that provides the main floor or hearth 2 of the furnace. These boxes 6, 6 are preferably made from steel plates Welded together at their edges to provide watertight'closures for the circulation of cooling water which, as shown in Fig. 2, may enter each box by a suitable connectionS and may leave each box by a suitable'connection 9. In this way, adequate cooling of the receiving portion of the furnace floor or hearth 2 is provided,-such cooling, in the present instance, being highly desirable because, with the recuperatoror stove arranged wholly at the extreme end of the furnace and wholly beyond the charging zone, all of the hot gases on their way to said recuperator are passed over sa1d charging zone, thereby subjecting it, to a much more intense heat than that which prevails when the charging zone, as in the usual furnace construction, is located beyond the recuperator.

The hollow water-cooled boxes 6, 6 are so supported that their upper surfaces are somewhat below the supporting level of the floor or hearth 2 at the charging zone,this permitting the boxes 6, 6 to have superposed thereon, in covering relation, a plurality of wear-resisting plates 10, 10, of sufiieient thickness such that the upper surfaces of said plates are substantially flush with the level of the main furnace floor 2. The attachment of said plates 10, 10 to the boxes 6, 6 is preferably obtained by means of bolts 11, 11; to this end, each plate 10 has one or more bolt-receiving openings therethrough, which are enlarged, on the upper surface of the plate, as shown at 12, to contain the heads of the bolts, the latter being passed through welded spacing sleeves 13, 13 connecting the bolt apertures in the upper and lower plates of the boxes 6, 6. The projecting ends of the bolts 11, 11 are preferably slotted to receive wedge-shaped keys 14, 14 on the under side of the boxes 6, 6, thereby to clamp the wear plates 10, 10 securely to said boxes, so that the cooling Water circulated through the latter will absorb a large portion of the heat to which said plates are subjected.

Each plate 10 is made relatively short in length, to avoid excessive Warping,there being, as here shown, three such plates attached in covering relation to each box 6, thus providing in effect a sectional wearresisting receiving surface onto which the successive billets are charged endwise through the opening 4.- As an additional precaution against undue warping of the wear plates 10, the latter are preferably formed with transverse grooves 15 in their under surfaces, as shown in Fig. 4. Each plate 10, along its outer edge, provides an upstanding flange 16, the several flanges 16 being in alinement and thereby providing a substantially continuous guide surface across the full width of the furnace that prevents the entering billets from being projected across the recuperator, and also serves as a means to square up and aline each billet within the furnace, preparatory to the action thereon of the broadside pushers 5, 5.

The number and arrangement of the wear plates 10, 10 is preferably such that the gaps 17, 17 between said plates correspond to the locations of the several longitudinal skids 18, 18 that bridge the entrance to the recuperator or stove, said skids at their inner ends bearing directly on the water-cooled boxes 6, 6, and at their outer ends passing through the furnace roof to permit, as described in my aforesaid copending application Serial No. 456,206, the disposal of cooling water that is conducted to the interior of said skids from a watercooled hearth, not shown, at the opposite end of the furnace. Two or more of these hollow water-cooled skids 18, 18 serve as tracks or guides for the movements of the broadside pushers 5, 5, each of the latter, as shown at 19, Fig. 5, having a concave under surface conforming substantially to the convex surface of the skid pipe 18, thereby to maintain the parallelism of said pushers, and also, in considerable degree, to prevent their overheating.

The pushers 5, 5 are further kept from overheating by the proximity of their ends to the water-cooled boxes 6, 6, the latter preferably having hollow lateral extensions 20, 20 underlying the paths of the pushers, these extensions being protected by projecting portions 21, 22 provided by the opposing edges of each pair of adjacent wear plates 10, 10.

I claim:

1. In a metal-heating furnace, a recuperator underlying and directly communicating with one end of the furnace chamber, and means in said chamber located inwardly of and entirely beyond said recuperator to receive the stock to be heated in said chamber.

2. In a metal-heating furnace, means for procuring broadside movement of the stock Within the furnace chamber, and a recuperator within said furnace immediately adjacent to and directly communicating with said chamber, the entrance to said recuperator being wholly beyond the path of movement of thestock through said chamber.

3. In a metal-heating furnace, a recuperator underlying the furnace chamber, an opening for the passage of hot waste gases from said chamber to said recuperator, a water-cooled member bridging said opening, and a pusher supported on said member to move the stock within said chamber along the floor thereof. 7

4. In a metal-heating furnace, a heating chamber, a transverse support therein onto which is charged the stock to be heated,'said support being hollow for the circulation of cooling fluid, and a plurality of plates detachably secured in covering relation to said support, to give the latter a multi-section wear-resisting surface.

5. In a heating furnace, a heating chamber, a recuperator directly communicating with and underlying one end of said chamber, and a water-cooled receiving platform I for the stock charged into the furnace, said platform being substantially flush with the floor of said chamber and at a level between that of the top of said recuperator and the able Wear-resisting surface which provides a ledge to obstruct the over said recuperator.

6. In a metal-heating furnace, a recuperator underlying one end of the furnace chamber and communicating therewith, a water-cooled support, located inwardly of and entirely beyond said recuperator, to receive the stock charged into the furnace, a set of water-cooled skids extending from said support across said recuperator, and pushers movable on said skids to cause broadside movement of the stock received on said support.

7. In a metal-heating furnace. a recuperator underlying one end of the furnace chamber and communicating therewith, a water-cooled support, located inwardly of and entirely beyond said recuperator,to receive the stock charged into the furnace, a set of water-cooled skids extending from said support across said recuperator, a plu rality of wear-resisting plates attached to said support and serving as spacers for said skids, and pushers movable on said skids to cause broadside movement of the stock received on said support.

8. In a metal-heating furnace, a recuperator underlying one end of the furnace chamber and communicating therewith, a water-cooled support, inwardly of and entirely beyond said recuperator, to receive the stock charged into the furnace, a set of water-cooled skids extending from said support across said recuperator, a plurality of wear-resisting plates attached to said support and serving as spacers for said skids, and pushers movable on said skids to cause broadside movement of the stock received on sa1d support, sa1d plates having extenslons serving as guides for said pushers. i

JEROME R. GEORGE passage of said stock

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