US2098586A - Reverberatory furnace - Google Patents

Description

Nov. 9, 1937. E. R. MARBLE 2,098,586

REVERBERATORY FURNACE Filed Nov. 50, 1935 2 Sheets-Sheet 1 INVENTOR [all 15. Marfile ATTORN Y Nov. 9, 1937. E. R. MARBLE 2,093,586

REVERBERATORY FURNACE Filed Nov. 30, 1935 2 Sheets-Sheet 2 INVENTOR gar/Z. fiar&l

21 ATTORNE Patented Nov. 9, 1931 I amass.

T oFFlc-E IEYEBBEBATORY FURNACE Earl 1:. Marble, m'rm, Tex, aaoignor a American smelting and Refining Company, New York, N. Y., a corporation of New Jersey Application November :0, 1935, Serial N w 8 Claims.

This invention relates to metallurgical furnaces and particularly concerns certain improvements in furnaces of the reverberatory type.

The invention provides a reverberatory furnace which permits expansion and contraction of its constituent parts without deterioration thereof or leakage of the furnace contents, such as commonly occur with many prior art furnaces. Further, furnaces constructed in accordance with the invention have a maximum bath area with a minimum tie-up of metal and metal losses, occasioned by the building up of accretions or furnace run-aways with their attendant dangers to both workmen and equipment, are greatly minimized.

Although the novel features which are believed to be characteristic of this invention .will be particularly pointed out in the claims appended hereto, the invention itself, as to its objects and advantages, and the manner in which it may be carried out, may be better understood by referring to the following description taken in connection with the accompanying drawings forming a part thereof in which Fig. 1 is a top plan view of a furnace constructed in accordance with the invention.

Fig. 2 is a side elevation of the furnace, shown in Fig.1.

Fig. 3 is an end view at the firing end of the furnace shown in Figs. 1 and 2 with the burner removed.

Fig. 4 is a longitudinal section taken on the line 4-4 of Fig. 1.

Fig. 5 is a cross-section taken on the line 5-5 of Fig. 2.

Like reference characters denote like parts in the several figures of the drawings.

In the drawings, I0 is a semi-cylindrical steel pan carried by a steel cradle consisting of cut out I-beams i2, and flanges I, the lower I-beams resting on steel sheet It on the foundation or floor. The buckstays l8, of which five pairs are shown, are fastened at their tops with tie-rods 20 and at their bases with bolts 22 secured to the I-beams of the cradle.

The two semi-cylindric courses of brick 24, 26 which make up the hearth are laid on the cushion fill 28 which lines the pan I ll. Side walls 30 extend vertically from the inner brick course 24 to the arch or roof 32, the latter being supported by the beams 34 which extend along the length of the furnace and arecarried by the buckstays it.

The brick work of the end walls 36 and 38 telescope into the semi-cylindrical hearth, as

55 shown in the drawings, and abut the steel end plates III and 42, the former being held by I- beams ll associated with tension rods 4i equipped with springs 48 and the latter secured in a similar manner by I-beams 50 associated with tension rods 52 and springs 54. 5

At one end of the furnace is the burner 56 and at the other end flue 58. Tap holes ill and i2, skimming door 64 and charge opening 88 with hopper 68 on the charge floor (not shown) above the furnaceare provided.

As will be readily perceived by those skilled in the art, the improved furnace of this invention is conducive to many economies both as regards maintenance and operation. Thus with furnaces of conventional designin which a rectangular pan 15 is used, the distortion of the pan and brick work due to successive heatings and coolings eventually leads to ruptures and leakage of the furnace contents. Further, such constructions induce the formation of accretions, particularly in the square 20 corners formed by the sides and ends. By constructing the furnace in accordance with the invention these disadvantages are overcome.

The semi-cylindrical shape of thepan in the present furnace permits the circumferential expension and contraction of the lining without injury to the brick and simultaneously minimizing the danger of leakage. Also, the circumferential expansion of the lining transmits the thrust to the side walls without damage to the 30 independently supported arch. As will be readily apparent, movement of the parts of the furnace are readily taken care of either by movement of the furnace within the cradle or movement of the cradle itself on the steel sheet.

By'the novel construction of the ends of the furnace there is provided a yielding resistance to the longitudinal movement of the brickwork, the springs acting to return the ends to their normal position upon cooling. With repeated heatings and coolings a furnace so constructed has returned each time over a period of several months to its original dimensions and there has been no leakage of metal, distortion of the structure, or building up of accretions.

While certain novel features of the invention have been disclosed and are pointed out in the annexed claims, it will be understood that various omissions, substitutions, and changes may be made by those skilled in the art within the scope and spirit of the invention.

What is claimed is:

1. A reverberatory furnace comprising the combination with a semi-cylindrical pan, a cradle supporting said pan, a semi-cylindrical brick hearth in said pan and supporting the furnace side walls, of an arch supported independently of said walls.

2. The combination in a reverberatory furnace having a semi-cylindrical hearth, side walls and an arch, of means supporting said arch independently of said side walls and end walls yieldably telescoping said hearth and side walls.

3. In a furnace of the reverberatory type, a semi-cylindrical hearth structure, a cradle supporting said hearth structure, end walls telescoping the hearth and furnace side walls and mounted for movement independently thereof, plates adjacent said end walls and means associated therewith for returning the end walls to their original position upon cooling of the furnaoe.

4; The combination in a reverberat'ory furnace having an arch, side walls and a semi-cylindrical hearth, of a cradle supporting the hearth, end walls and yieldable means mounted on said cradle and secured to said end walls for permitting 1ongitudinal movement of said end walls.

5. A reverberatory furnace comprising a cradle supporting a semi-cylindrical hearth, buckstays spaced along the sides of the furnace, opposite buckstays being connected with tie-rods at their tops and to the cradle at their bottoms, an arch carried by said buckstays, side walls carried by said hearth, end walls adapted to telescope within said hearth and side walls, steel end plates and means to control longitudinal movement of the furnace brickwork consisting of tension rods secured to said end plates and said cradle.

6. A reverberatory furnace comprising a sup- .Jporting cradle, a semi-cylindrical hearth, end

walls adapted for longitudinal movement within said hearth and springs and tension rods connecting said cradle and said end walls for maintaining the end walls in desired position.

7. A metallurgical furnace comprising a semicylindrical hearth, an arch, means supporting said arch independently of the furnace side walls, end walls and means permitting and controlling longitudinal movement of said end walls.

8. The combination in a metallurgical furnace having an arch, side and end walls, of a semicylindrical hearth supported by a cradle in a manner permitting self-adjusting movement between said cradle and the furnace proper during operation of the furnace.

' EARL R. MARBLE.

Images