US2794629A - Burner support for open hearth furnaces - Google Patents

Description

June 4, 1957 e. P. REINTJES BURNER SUPPORT FOR OPEN HEARTH FURNACES 4 Sheets-Sheet 1 Original Filed April 19, 1954 m 6 M v E M V WON e M G V! B Y u 4 June '1957 G. P. REINTJES 2,794,629

BURNER SUPPORT FOR OPEN HEARTH FURNACES Original Filed April 19-, 1954 4 Sheets-Sheet 2 8 I A f 3 :::IQIIIB I0 I at Sr 3; H I

INVENTOR.

BY Gebvae P. Reud 'es immfil I June 4, 1 e. P. REINTJES B URNER SUPPORT FOR OPEN HEARTH FURNACES Original Filed April 19, 1954 4 Sheets-Sheet 3 INVENTOR. BY Gwrqe Re'uft jes W June 4, 1957 G. P. REINTJES BURNER SUPPORT FOR OPEN HEARTH FURNACES 4 Sheets-Sheet 4 Original Filed April 19, 1954 2 0M "n DI v/ WIW 0 e v. n" B ||u OO United States Patent O BURNER SUPPORT FOR OPEN HEARTH FURNACES George P. Reintjes, Kansas City, Mo.

Substituted for abandoned application Serial No. 424,164, April 19, 1954. This application November 26, 1956, Serial No. 624,947

Claims. (Cl. 263-) This invention, which is a substitute for the prior forfeited application, Serial No. 424,164, filed April 19, 195 4, releates to burners for use with open hearth furnaces in which a burner bridge wall is not necessary, the objects being accomplished by having a burner housing spanning the down-flow passages at the ends of the open hearth and supported at its ends by the wall of the furnace and the proximate end of the open hearth bath supports. The encasement for the burner support is constructed of suspended tile thus making it possible to vary the diameter of the encasement by substituting longer or shorter tile to suit the extent or degree of damper effect on the outfiowing gases from the combustion in the open hearth. With this arrangement the encasement is also provided with an air passageway between the back of the suspended tile and the supporting metal structure so that a stream of air may be fed closely adjacent to the burner discharge for immediate mixing with the fuel to support combustion quickly and cool the burner.

Another object of the invention is to provide a construction in which jets of air or oxygen may be fed directly into the fire emitted by the burner to support combustion, such air being also utilized to cool the burner support and to assist indirectly the flame in the open hearth as may be best suited to operating conditions. The forced draft air jets may be directed at any desired angle to induce spiralling of the burner flame to increase the length of the flame or to change its angle of projection, as desired.

A further object of the invention is to provide for feeding air into the gases flowing out of the open hearth to insure that all combustibles are burned before they pass into the slag pocket. It is also to be noted that by omitting a heavy burner bridge wall, the down-flow pas sageways are unrestricted and the velocity of the gases will be slowed down, thus increasing the time for the deposit of slag in the slag pocket and lessening the carryover of slag into the checkers.

A further object of the invention is to provide jets of forced draft air in close proximity to the fuel so that these jets will accelerate combustion and act as siphon jets to draw in cooling air between the backs of the refractory and the metal supports.

With the general objects named in view and others as will hereinafter appear, the invention consists in certain new and useful features of construction and organization of parts as hereinafter described and claimed; and in order that it may be fully understood, reference is to be had to the accompanying drawings, in which:

Figure l is a longitudinal section through an open hearth furnace of the regenerative type to illustrate the relative location of the burner housing of the invention.

Figure 2 is an enlarged fragmental longitudinal section through the end of the burner casing which supports the refractory tile for the protection of the burner.

Figure 3 is an end view of the construction as shown in Figure 2.

Figure 4 is a side view of one of-the spacing and pipe supporting casting members which encircle the burner casing.

Figure 5 is a fragmental end view of the construction shown in Figure 4.

Figure 6 is an enlarged cross section through the burner housing and refractory protection.

Figure 7 is a perspective view of one type of tile hanger.

Figure 8 is a perspective view of a tile supported by the hanger of Figure 7.

Figure 9 is a detail view of the burner casing support carried by the wall supporting the end of the open hearth bath.

Figure 10 illustrates the nosing at the end of the burner casing.

In the said drawings, where like reference characters identify corresponding parts in all of the figures, 1 is an open hearth furnace with the molten steel lever in the bath being indicated by a wavy line. The ends of the open bath communicate through a long port 1a with the upper ends of passageways 2 communicating with the slag pocket 2a, which in turned is connected to the checkers, not shown. The passageways 2 are formed by the outer wall and side walls 2b and 20 respectively, on three sides and the supporting wall 2d for the bath, on the fourth side. These walls may be of any desired construction, such as solid masonry or metal-supported. In old constructions it has been common to obstruct the passageway 2 with a burner supporting bridge wall of considerable width. This bridge wall tended to restrict the gases and speed them up, and on reverse flow of hot air, the burner bridge wall forced the air to follow widely separated streams so that they did not immedate'ly mix with the fuel being ejected from the burner.

In order to stream-line the down flow of gases and the up flow of air through the passageways 2, a burner housing 5 spans the upper end of said passageway and is supported at its outer end by the furnace wall 3 and at its inner end by the bath supporting wall 4. This housing, as will hereinafter appear, is preferably of circular contour and is provided with a metal supported refractory protection. By the proper selection of length of refractory the overall diameter of the housing may be as desired to more or less damper the flow of gas and air.

In Figures 2 through 9 the construction of the burner housing 5 is shown in detail, in which 6-is a tubular metal casing, preferably of double-walled construction as shown. An oil or gas burner 7 is mounted within the casing ,6.

Arranged circumferentially around the casing 6 in spaced relation are a series of forced air or oxygen feed pipes 9, equipped with jet nozzles 10 at their ends which may be adjusted at any angle for the better control of the fuel and flame from the burner. These air pipes 9 not only supply air or oxygen, but also act as cooling agents to lower the temperature of the burner support assembly and they may be mounted in position by being threaded through openings in a series of spaced castings 8 encircling the casing 6. It is to be also understood that the jets may feed air or oxygen into the gases flowing out of the furnace to insure that all combustibles are burned in the furnace before the gases pass through the ports into the passageways 2. This insures the deposit of slag in the slag pocket and prevents its carry over into the checkers.

To protect the burner casing against the heat of the furnace a series of tile hangers 11 may be suspended from the pipe 9, said hangers being also used to spaced basic refractories from the water cooled casing, should basics be used, since it has been determined that basic refractory will spawl badly if one end is in contact with a watercooled surface and the other end is exposed to high temperature. The hangers 11 may be formed with T-heads 12 for engagement with pockets 13 in tile 14. If the burner assembly needs more cooling protection than that offered by the air flowing through the pipes 9 and between the'back of the refractory and the casing 5, as will hereinafter appear, certain of said pipes may be omitted and water cooling pipes 15 substituted therefor, said pipes 15 being connected to the space between thedonble-walls of casing'6.

In Figure 9 the support for the end of the burner casing is detailed. In this construction 16:: is a saddle assembly resting on the wall 4. One of the ring members 8 rests on the support 16a on the nosing is completed by a plastic refractory cap 17 as shown in horizontal section in Figure 10.

The tile spanning the upper circumference of the casing 6 are supported by gravity on a plurality of saddle castings 18 which are supported by the pipes 9 and 15 as shown in Figure 6. This tile 19 does not have to have a suspension hanger and it will rise and fall to ac commodate expansion and contraction.

Figure 10 illustrates in detail one method of forming the plastic cap. With this construction it is to be noted that the space 29 between the rear of the tile 14 and the casing 6, is open from end to end of the burner casing. Air, preheated or otherwise, may be permitted to circulate through the passageway thus provided. This air is for the purpose of conditioning the parts so that, for example, if basic are used, their rear ends will not be cooled so rapidly as to lead to spawling of the refractory.

From the above description it will be apparent that I have produced a construction embodying all of the features of advantage set forth as desirable; and While I have described and illustrated the preferred construction, it is to be understood that I reserve the right to make all changes within the spirit and scope of the appended claims.

I claim:

1. In an open hearth furnace, the combination with a roof, side and end walls, bath supporting walls spaced inwardly from the end walls and terminating short of the roof, said end, bath and side walls forming a downwardly extending passageway, a permanent metal casing freely spanning the passage and carried at its opposite ends by the bath and end walls respectively, a series of fluid inlet pipes externally of and paralleling the casing, discharge nozzles on the ends of said pipes, refractory hangers carried by the metal casing, and refractory dcmountably carried by said hangers.

2. In an open hearth furnace, the combination with a roof, side and end walls, bath supporting walls spaced 5 inwardly from the end walls and terminating short of the roof, said end, bath and side walls forming a downwardly extending passageway, a permanent metal casing freely spanning the passage and carried at its opposite ends by the bath and end walls respectively, a series of fluid inlet pipes externally of and paralleling the casing, discharge nozzles on the ends of said pipes, tile hangers suspended from the pipe, and tile detachably carried by said hangers.

3. In an open hearth furnace, the combination with a roof, side and end walls, bath supporting walls spaced inwardly from the end walls and terminating short of the roof, said end, bath and side walls forming a downwardly extending passageway, a permanent metal casing freely spanning the passage and carried at its opposite ends by the bath and end walls respectively, a pipe supporting ring encircling the casing, a series of fluid inlet pipes carried by the ring in spaced parallel relation to the easing, discharge nozzles on the ends of said pipes, tile hangers suspended from the pipe, and tile detachably carried by said hangers.

4. In an open hearth furnace, the combination with a roof, side and end walls, bath supporting walls spaced inwardly from the end walls and terminating short of the roof, said end, bath and side walls forming a downwardly extending passageway, a permanent metal casing freely spanning the passage and carried at its opposite ends by the bath and ends walls respectively, a series of water cooling pipes positioned exteriorly of the casing and connected to the space between the double walls adjacent the bath supported end or" the casing, tile hangers suspended from said pipes, and refractory tile detachably carried by said hangers.

5. in an open hearth furnace, the combination with a roof, side and end walls, bath supporting walls spaced inwardly from the end walls and terminating short of the roof, said end and bath walls forming a downwardly extending passageway, a permanent metal casing freely spanning the passageway and carried at its opposite ends by the bath and end walls respectively, a series of refractory hangers radiating outwardly from the casing, and refractory detachably carried by said hangers and spaced from the casing to provide an air cooling passageway between the outer face of the casing and the inner ends of the refractory.

References Cited in the file of this patent UNITED STATES PATENTS 1,566,608 Kruse Dec. 22, 1925 2,132,517 Reintjes Oct. 11, 1938 2,542,684 Laverdisse et al. Feb. 20, 1951 Maser-m

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