US2593481A - Port chamber wall construction with deposit retaining ledge for open hearth furnaces - Google Patents

Description

Aprll 1952 R. E. OVER PORT CHAMBER WALL CONSTRUCTION WITH DEPOSIT RETAINING LEDGE FOR OPEN HEARTH FURNACES Filed Sept. 27. 1947 2 SHEETSSHEET l INVENTOR.

RAYMOND E. OVER A T TOP/VF vs A ril 22, 1952 R. E. OVER w 2,593,481

PORT CHAMBER WALL CONSTRUCTION WITH DEPOSIT RETAINING LEDGE FOR OPEN HEARTH FURNACES Filed Sept. 27. 1'94? 2 SHEETSSHEET 2 IN VEN TOR.

RAYMOND E. OVER A 7' TOAWEKS Patented Apr. 22, 1952 PORT CHAMBER WALL CONSTRUCTION WITH DEPOSIT RETAINING LEDGE FOR OPEN HEARTH FURNACES Raymond E. Over, Oak Park, Ill., assignor to M. H. Detrick Company, Chicago, 111., a corporation of Delaware I Application September 27, 1947, Serial No. 776,584

11 Claims.

ucts of combustion, and it has been found that with sufiicient time a protective film or layer forms over these inner surfaces of the port chambers, resulting in less wear or erosion in the walls than would otherwise be the case. This is due to the fact that iron oxide in either a vapor or liquid form engages with the walls and a coating of slag or iron oxide is built up on the walls of the port chambers.

It is a particular purpose of my invention to provide means for promoting the accumulation of slag or iron oxide, or of slag and iron oxide, on the inner faces of walls built of basic brick, such as the walls of port chambers of open hearth furnaces.

It has been found that such a coating of slag or iron oxide, or of iron oxide and slag, will build up on the inner faces of walls built of basic brick in port chambers and similar places, so as to form such a protective layer or film as above referred to much more rapidly than would otherwise be the case, by providing ledges on the inner faces of said walls, this being accomplished by utilizing refractory members that are arranged in rows that run substantially horizontally -and which project inwardly beyond the other refractory members that form the-major portionof the wall, said rows being vertically spaced so as to provide a series of ledges protruding from the inner'faces of the walls at desired intervals. I'I'he" provision of such ledges accelerates the start .of themetective coating by retaining particles, that would normally be carried through the furnace, on such ledges, where the coating begins to build up, and other particles unite therewith to continue the not project inwardly as far as the ledges.

In addition to the advantage of providing means for quickly building up a protective coating on the walls of port chambers of open hearth furnaces and imilar structures, the port chamber construction that I utilize has the advantage that the refractory members forming the ledges also serve as repair or key links to facilitate re-' moval or renewal of sections directly below the same where walls that are suspended sectionally are provided.

Other objects and advantages of my invention will appear as the description of the drawings proceeds. I desire to have it understood, however, that I do not intend to limit myself to the particular details shown or described, except as defined in the claims.

I In the drawings:

Fig. 1 is a vertical sectional view, partly broken away, of a portion of a port chamber showing my improved construction for building up a protective coating; and

Fig. 2 is a vertical section taken transversely of Fig. 1, substantially on the line 2-2 of Fig. '1.

Referring in detail to the drawings, my invention is shown as being applied to a port chamber wall construction that has frame members, such building up of the protective coating from the ledges upwardly over the wall portion that does I as the frame members 3 and 4, which are part of the framework for supporting the refractory members of the wall and which have hangers, such a the hangers 5, 6 and I mounted thereon, from which the refractory members of the wall are suspended or supported. The refractory members that are supported or suspended from the hangers comprise refractory members 8 of uniform size and shape, and other refractory members, such as the members 9, that are of different shape than the members -8, having curved faces so as to merge smoothly with the inclined and vertical walls made up of the members 8. In ordinary port chamber construction that various refractory members are placed with their inner end faces in smooth alignment so as to not have any breaks-or offsets in the walls, as would be true of the members 8 and 9, if only these were used. In a sectionally supported wall, such a illustrated, a. plurality of the members 8 are suspended or supported by the hanger members 5, 6 and I and the refractory members 9 are similarly suspended or supported thereby, the hanger members being of such a character as to hold the refractory member in position in a well known manner. It will be noted that a certain predetermined number of such refractory members are supported by each of the hanger members and thus the Wallis supported in sections or sectionally supported from the framework.

In my improved port chamber construction, instead of building the wall entirely of members 8 and 9 that form a smooth surfaced inner face to the wall, I provide means for forming a plurality of ledges that are vertically spaced from each other along the walls of the port chamber on which the slag or iron oxide, or both, can build up to form a protective coating starting at these ledges and building upwardly on the inner faces of the members 8. This protective coating builds up much more rapidly when such ledges are provided and thus increases the life of the wall.

In the form of the invention disclosed in the drawings, the ledges are formed by means of refractory members l0, which are of the same cross section as the members =8, but are longer so that the same project outwardly beyond the inner faces of the members 8 and 9 and provide ledges I I at the upper projecting edges of the members It where the upper faces thereof project beyond the adjoining members 8. v

Said members Ill are located at the upper ends of the sections supported by the hanger members by the next lower members 8 or 9, as the case may be, and are free of the hanger members entirely so that the members can be readily removed to aid in the disengagement of the members 8 and 9 from the hanger brackets, which has to be done ordinarily by a movement thereof lengthwise of the direction of extent of the hanger member, or in a generally upward direction. The fact that the refractory members lil project inwardly beyond the faces of'the members 8 and 9 aids in not only locating said ledge forming members, but also in making the same avilable for removal. Preferably, some form of expansion joint is provided between the various sections of the sectionally supported structure, preferably, air spaces [2 being provided therein for this purpose. I

While single rows of the refractory elements ll) are ordinarily used, at such locations where an arch, such as the dog house arch I3, is to be supported, a double row of said refractory members It! may be provided, as shown in the drawings, if this is found to be desirable.

The members 8, 9 and H) are all made of basic refractory material, or basic brick, and in operation the ledges H formed by the projecting refractory members It provide means at which particles that would otherwise pass out through the port chamber that is acting as the outlet chamber, will lodge and start the building up of a protective coating, which will build up along the inner faces of the members 8 or similar refractory members that lie above the ledges ll. While a certain number of ledges and certain spacing thereof is shown in the drawings, this can be. varied as may be found desirable. However, by providing substantially uniformly vertically spaced horizontal ledges by means of the members ID, a coating can be quickly built up that will protect all of the walls that are sub jected to the high heat at the discharge or out let end of the furnace.

While the members It are principally shown as being supported on refractory members 8 that are suspended or supported by hanger members 5, 6 and '1, said refractory members l0 may be supported on refractory members 8 that are mounted on frame members, such as the frame members It, without the interposition of hanger members and the same advantage as far as the building up of the protective coating will result.

The wall portions l5, l6, l7 and I8 and the dog house arches K3 are made up of a plurality of refractory members of standard construction, the

individual refractories thereof not being shown standing wall having a plurality of narrow, horizontal ledges provided thereon on the inner exposed face thereof.

2. In a port chamber for open hearth furnaces, walls defining said chamber including an upstanding wall of basic brick having a plurality of narrow, horizontal basic brick ledges provided thereon on the inner exposed face thereof.

3. In a port chamber for open hearth furnaces, walls defining said chamber including a sectionally supported vertical wall having rows of horizontally adjacent refractory members projecting slightly inwardly from the inner face thereof to form narrow ledges on the inner exposed face of said wall.

4. In a port chamber for open hearth furnaces, walls defining said chamber including a sectionally supported vertical Wall having vertically spaced horizontally extending rows of horizontally adjacent refractory members projecting slightly inwardly from the inner face thereof to form narrow ledges on the inner exposed face of said wall.

5. In a port chamber for open hearth furnaces, walls defining said chamber including an upstanding sectionally supported Wall having horizontal rows of refractory members between the sections of said wall projecting inwardly slightly beyond the sectionally supported wall sections.

6, In a port chamber for open hearth furnaces, walls defining said chamber including a sectionally supported vertical wall having a horizontal row of slightly inwardly projecting refractory members at the top of each section to provide horizontally extending vertically spaced narrow ledges on the inner face of said wall.

7. In a port chamber for open hearth furnaces, walls definin said chamber including a section ally supported vertical wall having a horizontal row of slightly inwardly projecting basic refractory members at the top of each section to provide horizontally extending vertically spaced nar row ledges on the inner face of said. wall, said inwardly projecting members being solely supported by the refractory members below the same.

8. In a port chamber for openv hearth furnaces, walls defining said chamber including vertical walls comprising a framework, hanger members mounted on said framework, vertical wall sections each comprising refractory members carried by said hanger members and a horizontal row of refractory members unattached to said hanger members and supported by said hanger carried refractory members, the refractory members of said row projecting slightly inwardly beyond said hanger carried members. 9. In a port chamber for open hearth furnaces, a plurality of widely spaced vertical walls defining said chamber, each wall having a plurality of vertically spaced horizontally disposed long narrow ledges provided thereon, the extremities of said ledges on opposite walls of said chamber being widely spaced from each other, said ledges projecting only slightly from the surfaces of the exposed faces of said Walls, the projection being insufficient to have any marked effect on the di-' rection of flow of gases through said chamber.

10. In a port chamber for open hearth furnaces,

a plurality of widely spaced vertical wallsof basicv brick defining said chamber, eachwall having plurality of vertically spaced horizontally disposed long narrow ledges of removable basic brick provided thereon, the extremities of said ledges on opposite walls of said chamber being widely spaced from each other, said ledges projecting only slightly from the surfaces of the exposed faces of said walls, the projection being insuificient to have any marked effect on the direction of flow of gases through said chamber.

11. In a port chamber for open hearth furnaces, a plurality of widely spaced vertical walls defining said chamber, each wall having a plurality of vertically spaced horizontally disposed long narrow ledges provided thereon; the extremities of said ledges on opposite walls of said chamber being widely spaced from each other, said ledges projecting only sufficiently from the surfaces of said walls that protective coating material can accumulate on said ledges without materially reducing the passage through said chamber.

RAYMOND E. OVER.

6 REFERENCES CITED UNITED STATES PATENTS Number Name Date 289,952 Alger Dec. 11, 1883 350,981 Kennedy Oct. 19, 1886 446,971 Heckert Feb. 24, 1891 605,797 Reagan June 14, 1898 1,068,470 Wheeler July 29, 1913 1,747,823 Foltz Feb. 18, 1930 FOREIGN PATENTS 5 Number Country Date 505,790 Great Britain May 17, 1939

Images