US1838145A - Smelting furnace - Google Patents

Description

Dec. 29, 1931. A. JONES SMELTING FURNACE Filed Aug. 11, 1930 2 Sheets-Sheet Inventor Arthur Jones m Att'y.

Deco 29, 1931. A. JONES SMELTING FURNACE 2 Sheets-Sheet 2 Filed Aug. 11, 1950 Inventor Arthur Jones Q Atty.

Patented Dec. 29, 1931 UNITED (STATES PATENT OFFICE ARTHUR JoNEsOF BELLEVILLE, ILLINOIs, ASSIGNOR r U. s. SMELTING FURNACE coMPa xon IBELLEVILLE, ILLINOIS, A CORPORATION or ILLINOIS SMELTING FURNACE Application filed August 11, 1930. Serial No. 474,365.

My invention relates to a smelting furnace and particularly to improvements in the type of furnace shown and described in United States Letters Patent-No. 1,524,397, granted to me January 27, 1925.

One object of my invention isto arrange the burner, with respect to the rotary furnace as to overcome the tendency of .the burner to blow thefiuid flux off the surface of the molten-charge, thus exposing the metal of the charge to thedeleterious effects resulting from contact with the products of combustion.- V I 7 Another object of my invention is to provide improved means facilitating the relative movements of the burner and furnace by permitting of the tilting of the furnace.

Another object of my invention is to provide means for discharging the metal from the furnace without tilting the furnace.

Still another-object ofmy invention is .to provide an improved form of supporting track for the rotary furnace body.

In the accompanying drawings, which illustrate one form of smelting furnace made in accordance with my invention, Figure 1 is a longitudinal sectionthrough both the furnace and burner structure; Figure 2 is an enlarged section through a portion of the burner structure; Figure 3 is an elevation showing the-discharge orifice of the burner structure; Figure '1 is a sectional view of a modified form of supporting track; and Fig ure 5 is an elevation of the form of track shown in Figure fl. I I I p The device comprises a burner structure 6 and a rotating and tilting furnace 7 supported in a frame 8. The burner structure, instead of being pivotally suspended-as in. my patent abov-ereferred to, is stationary and in details of construction is similar to the burner structure described in Letters Patent No. 1,514,214, granted to me Nov-ember 4, 1924. 9 is the air supply pipe having a downward extension 10 and connected through a fitting 11 of oblique cross type, but which may be regarded as a special T-joint with forwardly and rearwardly extending burner pipes 12 and 13, respectively. The downward extension 10 as well as the burner pipes 12 and 13 are threaded or otherwise rigidly secured in the T-joint 11 but the pipe 9 has sliding connection therewith, sufficient space being provided below the pipe 9 (as shown in Figure 2) to allow for the necessary expansion vof the pipe. By this constructionI am enabled to support the pipe 9 at the upper end and allow the expansion to take place downwardly. This overcomes the tendency of the highly heated pipe to buckle or bend laterally, which I have found occurs when the pipe is support- 1 ed at the bottom and allowed to expand upwardly.

Surrounding the T-joint and the adjacent portions of pipes 9,10,12 and 13 is a sectional burner block 14 of fire clay or other refractory material. This burner block issupplemented by upwardly and downwardly extending sleeves 15 and 16 and by forwardly and rearwardly extending sleeves 17 and 18, which sleeves, forconven ience in assembly, are preferably formed in sections, as described in my patent last named. The sleeve .17 surrounding the forward end of the burner instead of being centrally located in the burner orifice, is arranged at the lower side thereof so as to leave a single crescent-shaped return passage 18 for conveying the products Ofcombustion from the furnace to the flue 19. The axis AA of the burner, in place of being horizontal, is arrangedat an angle of about 10 degrees to the horizontal, line BB indicating the axis of the furnace. when in its normal or working position. Burner nozzle 20 slides in pipe 12 and is adjusted by means of rods 21 secured to a casing 22 connecting the burner pipe23 with a flexible fuel pipe 24. 25 is a hand wheel controlling a valve for regulating the gas or oil supply to the burner nozzle. This construction allows the burner nozzle to be drawn backward away from the intense heat of the furnace when the fuel supply is cut off. A removable cap 26 allows of the withdrawal of the nozzle for repairs.

The furnace 7 comprises a cylindrical shell 27, a pair of conical end pieces 28, and a refractory lining 29. Carried on the end pieces 28 are the tracks supporting the furnace in a tilting cradle 30 pivoted at 31 in the frame 8. These supporting tracks may be formed integral with the end pieces, as shown in Figure 1, but I prefer to use the construction shown in Figures t and 5. In this construction each of the end pieces has formed on its inner end a flange 32 provided with an annular shoulder 33 for the reception of a detachable supporting track 34. This construction not only allows a worn track to be renewed without replacing the entire end piece, but also enables the track to be made of more durable material than the cast iron of which the end pieces are formed andallows the rings, when made of steel, to be heat-treated to further increase their wearing qualities The tracks are secured on the end pieces by the tie rods 35 which extend between the ends and hold them against the shell. Additional fastening means in the form of bolts 36 may, if found I desirable, be positioned between the tie rods 35.

, In order to discharge the contents of the furnace without tilting it, I provide a tapping hole 37 (Figure 1) in one end thereof in line with a portion of an inner cylindrical surface serving as the bottom of the melting chamber. This hole is closed by lute as is usual with tapping holes. To discharge the furnace the tapping hole isbrought above the line of the metal by rotating the furnace, the hole opened by a bar and then the furnace is again rotated to bring the hole to its lowest or any intermediate position as it is desired to discharge all or only part of the metal. With this construction the usual pouring opening in the door 38 maybe omitted. in which case a small tell-tale opening 39 should be provided for the inspection of the fire.

To provide the necessary movement between the furnace and burner to allow of the tilting of the former. the frame 8 is slidingly mounted on a base 40. This allows of the movement of the frame carrying the furnace to bring the latter toward or away from a position of proximity to the burner orificeby means of screws {l1 threaded in lugs 42 on the base and bearingagainst the frame. Clamping bolts 43 maybe used. to lock the structurein position, either with the mouth of the furnace in contact with the burner, or sufliciently removed therefrom (as shown in Figure 1) to allow of the tilting of the furnace which is necessary for charging the same even when the discharge is accomplished without tiltinggas above described.

The inclination of the burner nozzle pretion of the burner to the exact angle of 10 degrees to the horizontal, I have found this angle to be the most effective in securing the desired results. i

Having fully described my invention, what I claim as new and desire to secure-by Letters Patent of the United States is:

1. In a device of the class described, the combination with a furnace supported by means permitting rotation thereof on a substantially horizontal axis, of a burner for said furnace provided with a nozzle discharging in the direction of the length of the furnace, said nozzle being inclined to the axis of said furnace to direct the fiameupwardly at an acuteangle to the surface of the contents of said furnace, and a return passage for the products of combustion adjacent said nozzle.

2. In a device of the class described, the combination with a furnace supported by means permitting rotation thereof on a substantially horizontal axis, of a burner for said furnace provided with a nozzle, discharging in the direction of the length of the furnace, said nozzle being inclined to the axis of the furnace to direct the flame upwardly at an angle of approximately ten degrees to the surface of the contents of the furnace, and a return passage for the products of combus tion adjacent said nozzle.

3. In a device of the class described, the combination: a furnace comprising a shell and a pair of end pieces, each of said end pieces being provided on its inner end with a flange having an annular shoulder on its inner face, and a track removably secured on each ofsaid shouldersto rotatably mount the furnace.

4. In a device of the class described, the combination: a furnace comprising a shell and a pair of end pieces, each of said end pieces being provided on its inner end with a flange having an annular shoulder on its innor face, a track on each ofsaid shoulders to rotatably mount the furnace, and tie rods extending between said end pieces to hold them to the shell, said rods also securing said tracks in position on said shoulders.

5. The combination with a stationary burner structure having a discharge orifice, of a rotating and tilting furnace, and a. base on which said furnace is slidingly mounted to be movable into and out of proximity to said burner orifice. I

6. The combination with a. stationary burner structure having a discharge orifice, of a rotating and tilting furnace, a base on which sa d furnace is slidingly mounted to be mov- 1.

able into and out of proximity to said burner orifice, and adjusting screws carried by said base for sliding the furnace thereon.

7. In a device of the class described, the combination with 21v furnace, of a burner therefor, and an upwardly extending suspended air supply pipe having sliding connection with said burner to accommodate the downward expansion of said pipe.

In testimony whereof, I hereunto aifix my signature, this 8th day of August, 1930.

ARTHUR JONES.

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