US1771850A - Furnace wall - Google Patents

Description

July 29, 1930. D. s. JAcoBus 1,771,850

' FURNACE WALL Filed March 9, 192's 2 Sheets-Sheet 1 IINIVENTOR' Y. W ATTORNEY-8' July 29, 1930. s, co us 1,771,850

FURNACE WALL Filed March 9, 1926 2- Sheets-Sheet 2 Fig; 5 Fig: (5 v ll I L. 30 l W 27 hp 32 an 32 e6 H sl a5 {35 35 WI'MW QL I 1 E INVENTOR Patented July 29, 1930 UNITED STATES PATENT o ncE 7 DAVID s. JACOBUS, or MONTCLAIR, NEW JERSEY, ASSIGNOR, BY MnsNE ASSIGNMENTS, ,TO FULLERLEHIGH coMrANY,-A CORPORATION or DELAWARE FURNACE wALL Application filed Karel 1,9, 1926. Serial No. 93,410.

This invention relates to a. furnace espe cially adapted for boilers, and will be understood from the description in connection with the accompanying drawings, in'Wh-ichFig. l

is a vertical section throughthe furnace and boiler; Figs. 1*- and 1 are similar sections, broken away, showing details; Fig. 2 1s a section along the line 22 of Fig. 1; Figi 3 "is a enlarged side elevation showing one of the details; In the drawings, reference characters 10 and 11 indicate the front and rear a cross header 21, from walls of a furnace, the furnacebeing surrounded by a casing 13. One of the side walls of the furnace is shown at 14, and the furnace is provided with fuelburners 15 for oil or ulverized coal, although it is to be understood that the invention is not restricted to this particular sort of burner, as stokers, for example, may be used. A boiler of the Babcock & Wilcox type is shown disposed above the furnace with horizontally inclined tubes 16, terminating in headers '17 which are, in turn, connected to the steam and water drum 18. A tube 19 leads from the drum 18 to a header 19, from which slag screen tubes 20 lead through sleeves. 20 in the front wall 10 of the furnace, and these slag screen tubes merge into water cooling wall tubes21, which extend upwardly along the inside of the wall 11- of the furnace, and then outwardly into which a pipe 22 leads to the drum 18.

In the illustrative embodiment, the walls of the furnace comprise wedge-shaped blocks 25 (Fig. 3), of highly refractory material having vertical grooves 26 in thesides thereof. Metallic holding members 27 have bulbed portions 28 which fit into the grooves 26 to hold the tile 25 in place. The ends of the bulbed portions 28 are tapered, as shown at 29 8), to prevent the edges of the tile from being caught as the same are moved up and down. Angle irons 30 are providedto which the holding members 27 are attached and the joints.

in anyconvenient manner, as by riveting or bolting the same thereto. Wedge-shaped intermediate tile 31 are located 'on arcs of circles between pairs of tile 25 to form a plurality 'of'arches with their soflits forming the inner side of the wall,-and these tile 31 may be of cheaper or less strong material than the tile 25. Metal backing plates 32 are disposed between the angle irons '30 and are secured thereto in any convenient manner. These backing plates 32 contact with the vertical faces of the tile 31-, which faces form .the backs of the arches, and retain the tile in place. They may be made thin enough to be sufficiently flexible to spring out and into take care of the expansion, even when their edges are rigidly attached to the angle irons 30, or, this attachment may be by other suitable means which will permit a certain amount of play, if desired. The above arrangement results in the formation of a plurality of non-structural arches, and by this expression I mean arches which are-not relied upon as. structural arches to support'a load,

whether that load consists of the dead load of the arch itself, or an additional load. imposed upon the arch.

The casing 13 surrounds the wall of the furnace, and is spaced a short distancetherefrom, .so as to provide air passages between the furnace wall proper and the casing itself.

Supporting T-bars 33 have angle irons 34 attached thereto, and spacing straps 35 are connected between the angle irons 30 and 34:. The casing 13 may be made up of flanged lates 36 and 37 that are attached to the -bars 33, and are spaced apart slightly, the space therebetween being filled with heat insulating material 38.' The joints between the and the casing 13. A fan 43 draws air from the conduits 42 and forces the same through the conduit 44 and downwardly rear wall of the furnace andbthe casing 13, through the space 45 below the furnace, and upwardly between the front wall 10 and the casing 13, through the openings 46 into the furnace. Openings 47 rovided with doors 48 may be provided at t e lower edges of the furnace for removing ashes therefrom.

The portion of the furnace wall at the rear that is cooled by the water tubes 21 is most clearly shown in Figs. 2 and 7 in which the water tubes 21 are shown connected to the holdin members 27' as by autogenous welding 21 for example. The tile 25 are held between the tubes 21 and the flanges of the holding'members 27, and the tile '31 are re-' tained between the pairs of tile 25 by means of the metal plates 32, as already described.

The operation is as follows: Cooling air enters the spaces at the lower edges of the furnace between the side walls 14 and the casing 13, and passes upwardly, as indicated by the dotted arrows in Fig. 1, into the conduits 42, from which it is drawn by. the fan 43 and forced into the horizontal conduit 44, from whence it passes downwardly between the rear wall 11 and the casing 13, under the furnace through the channel 45, and thence upwardly between the front wall 10 and the casing 13, through the openings 46 into the furnace. V

The tile 25 and 31 are free to expand vertically as the tile 25 are permitted to slide along the bulbed portions 28 of the holding members 27. Horizontal expansion is also provided for, since the tile 31"ai'e arranged on arcs of circles and the plates 32 may bend outwardly a short distance. It will, there fore, not be necessary to provide for expansion of the tile from side to side of the wall, as local expansion in each section is provided for.

Various changes and modifications can be made in the details without departing from the spirit or scope of the invention.

I claim: I

1. In a furnace wall, spaced holding members and a plurality of tile disposed between said members and forming a plurality of arches therebetween, each arch being substantially unrestrained from outward movement and having its soffit forming the inner side of the wall, flexible means disposed between said members and contacting with the back of said arches to retain said tile in position, and a casing wall spaced outwardly from said arches to form an air space between the arches and the casing wall.

2. In a furnace wall, spaced holding members and a plurality of tile disposed between said members and forming a plurality of arches therebetween, each arch being substantially unrestrained from outward movement and having its soffit forming the inner side of the wall, a plurality of flexible plates between the disposed between said members and contact ing with the back of said arches to-retain said tile in position, and a casing .spaced from said plates and forming therewith a space for the passageof a fluid.

3. In a furnace wall,-spaced holding members and a plurality of tile disposed between said members and forming a plurality of non-structural arches therebetween, eaclr arch having its soflit forming the inner side of the wall, and a plurality of flexible plates disposed between said members and contacting with the back of said arches to retain said tile in position. v

4. In a furnace wall, spaced holding members and a plurality of tile disposed between said members and forming a plurality of nonstructural arches therebetween, each arch having its soflit forming the inner side of the Wall, and a plurality of water tubes disposed on the inside of said wall and secured to said holding members.

5. In a furnace wall, spaced holding members and a plurality of tile disposed between said members and forming a plurality of nonstructural arches therebetween, each arch having its sofiit forming the inner side of the wall, and a plurality of water tubes disposed on the inside of said wall and secured to said holding members, said water tubes having sliding engagement with the tile adjacent thereto and holding said tile in position.

6. A furnace wall comprising inner and outer portions spaced apart toform an air space therebetween, said inner portion comprising spaced holding members, and a In rality of tile disposed between said mem ers and forming a. plurality. of arches therebetween, each arch having its soflit forming the inner side of said inner portion andbeing substantially unrestrained from outward movement into said space.

7 A furnace wall comprising inner and outer portions spaced apart to form an air 'space therebetween, said inner portion comprising spaced holding members, a plurality of tile disposed between said members and forming a plurality of arches therebetween, each arch having its sofiit forming the inner side of said inner portion and being substantially unrestrained from outward movement into said space, and flexible means extending between said members and contacting with the backs of said arches to retain said tile in position.

DAVID S. JACOBUS.

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