US2059766A

US2059766A - Furnace wall structure

Info

Publication number: US2059766A
Application number: US676719A
Authority: US
Inventors: Andrew S Barker
Original assignee: Individual
Current assignee: Individual
Priority date: 1933-06-20
Filing date: 1933-06-20
Publication date: 1936-11-03
Anticipated expiration: 1953-11-03

Description

Nov. 3, 1936. A. s. BARKER 2,059,766

FURNACE WALL STRUCTURE Filed June 20, 1933 2 Sheets-Sheet l INVENTOR ATTORNEY Nov. 3, 1936. A. s. BARKER FURNACE WALL STRUCTURE 2 Sheets-Sheet 2 Filed June 20, 1933 INVENTOCI ,WW L

ATTORNEY Patented Nov. 3, 1936 UNITED STATES PATENT OFFICE FURNACE WALL STRUCTURE Andrew S. Barker, Palmyra, N. J.

Application June 20, 1933, Serial No. 676,719

7 Claims.

My invention relates to furnace wall structure and more particularly to lining structure for a combustion furnace and still more particularly to removable block structure for use in 5 connection with furnace linings, walls, suspended arches and the like.

The object of my invention is to provide a simple structure facilitating the application of blocks to water tubes or other rigid members and the ready removal thereof.

The full nature of my invention will be apparent from a consideration of the following specification considered in conjunction with the M accompanying drawings forming a part of this 15 "specification.

With reference to the drawings:

Fig. 1 is a general view in vertical cross section of a combustion chamber including wall structure embodying the invention;

Fig. 2 is a perspective view of a curved portion of a suspended arch embodying the invention and may be considered as an enlarged view of a part of the structure of Fig. 1;

Fig. 3 is one view (a plan view with horizontal 2;, tubes) of a number of blocks and securing means in accordance with the invention;

Fig. 4 is a view taken on the line 4 l of Fig. 3;

Fig. 5 is a View taken on the line 55 of Fig. 4;

Fig. 6 is a view similar to Fig. 5 showing a 30* block having angularly disposed side surfaces;

Fig. '7 shows one example of the application of my invention to a vertical wall and is a vertical sectional view;

Fig. 8 is an end view of the structure of Fig. '7;

Fig. 9 is a sectional view taken on the line 99 of Fig. 7;

Fig. 10 is a perspective view of a modified form of refractory block; and Fig. 11 is a perspective View of another embodiment of my invention.

Referring to Fig. 1, the combustion chamber II] is shown as fired by a stoker diagrammatically indicated at i i The combustion chamber may serve to provide heat for a boiler designated generally at 12. The invention, however, is not limited to the particular type of boiler structure from the drum l6 through the tubes l5 and header M into the tubes 13 and thence forwardly and upwardly to the header I9 and thence through the conduits to the main steam generating portion of the boiler. Tubes l3 with attached blocks designated generally at 2| may be termed a water-cooled suspended arch. The tubes may be supported by hangers 22.

Fig. 2 shows the curved part of the arch tubes H and the mode of connecting the refractory blocks thereto. In such an arch, the blocks are of refractory material such as fire clay and other suitable non-metallic heat resistant materials, but it will be understood that the invention is not limited to any particular composition of blocks.

In the preferred embodiment, each block is provided with a rear tube-receiving recess 23. As here used, the words front and rear refer to the fire side and the opposite side respectively of the refractory block. The tube receiving recess 23 is formed between projections 24 which extend rearwardly from what may be termed the main body portion of the block. The projections 24 constitute extensions of the body portion proper of the block and the side surfaces of the block are continuous surfaces over the side faces of the body portion and the side faces of the projections as well so that full contact is obtained between adjacent blocks over the entire side surfaces thereof. In the inside lateral surface of each side of the recess 23 is an L-shaped slot 25. The vertical part of the L-shaped slot as shown in Fig. 5 is at the side surface of the block. This part of the slot, numbered 25a, may be termed the entering portion. The horizontal part 25b in Figs. 4 and 5 may be termed the retaining portion. Alternate blocks are placed with the entering portion of the slot on the same side and the intermediate blocks with the entering portion of the slot at the opposite side, so that the two slots in adjacent blocks come together and form a T-shaped slot. This is clearly shown in Fig. 2 where I have designated one such combination of slots with the reference character T. When the blocks are of fire clay or analogous non-metallic material it is desirable to make the rearwardly extending projections of the full thickness or substantially the full thickness of the blocks in order to provide the maximum strength at the place of engagement of the clips, and the arrangement of the slots shown in Fig. 2 is particularly advantageous in this respect, since by means of this arrangement the entering portions of the slots in each block may be and preferably are narrower than the clips, as shown in this figure. The comparatively narrow entering portions of the slots permit the retention of relatively large and strong lug portions rearwardly of the retaining portions of the slots, while at the same time the narrow entering portions do not interfere with the ready insertion and removal of wide clips because of the side-by-side position of the entering portions of the slots of adjacent blocks.

In order to hold the blocks to the tubes, I provide a bowed piece 26, preferably made of strip metal. Such pieces may be cast or otherwise formed and they may be stiff or formed with some resiliency. These pieces are of such shape that they can be intoduced into the entering portion 25a of the slot and thence moved laterally in the retaining portion 25b of the slot to the position shown in Figs. 2 and 4, in which position they look the blocks to the tubes. It will be seen that the right angle or L-shaped slot is in the nature of a bayonet slot, and the connection of the blocks with the tubes may be termed a bayonet joint. Preferably, plastic refractory 28 is interposed between the blocks and the tubes so as to insure good heat transmission from the blocks to the tubes.

Referring to Figs. '7, 8 and 9, an example is illustrated of the application of the invention to a vertical water cooled wall. In this case the refractory lining is sectionally supported and for purposes of illustration only a single tier of refractory blocks has been shown. The vertical water tube 30 has welded thereto a supporting plate 3| forming a shelf for supporting a tier of blocks and on this tier plate the supporting block 32 rests. On block 32 is a block 33 having rearward projections 24 and secured to the tube by structure similar to that previously described. The clips or tie members 26 are inserted downwardly in the slots 25. Between the several secured blocks 33 of the tier there are inserted unsecured filler blocks 33a and in cases Where unsecured filler blocks are employed, the edge portion of the slots in the blocks 33 may be omitted as in the structure shown in Fig. 11, since the interposition of filler blocks without rearward projections provides space for removal of the clips. The provision of the entering portions of the slots, however, facilitates standardization in manufacture of the blocks.

In the vertical wall structure, as well as in suspended arch structure, I prefer to make the fit between the tubes and the blocks relatively loose and fill the intervening space with plastic refractory as indicated at 28 in Figs. '7 and 9.

Obviously, the invention lends itself to many specific different types of construction and support in vertical walls, both of sectionally supported character and of cumulatively loaded character.

Fig. 10 shows another form of block wherein the slots are cut down on each side of the inside surface of the extension 24 so that clips may be slipped in from either side of the block.

It will be seen that the structure is simple and inexpensive. Individual blocks may be readily removed and replaced independently of adjacent blocks. Particularly where plastic refractory filling is in use the dimensions are not critical. The tie members can be rigid or they may be. sprung somewhat when in position in case it is desired to have a tight pressure fit between the block and the surface of the member to which the block is secured. Also, it will be evident that the portions 252) at the slots need not be curved to correspond to the curvature of tubes or other members on which the blocks are mounted.

It will be understood that the invention is not limited to the specific structure shown but may be applied to a wide variety of structures.

What I claim is:

1. The combination with a hollow tubular member adapted to be protected from heat, of a pair of refractory blocks having rearwardly extending projections providing recesses in each of the blocks receiving said member and L-shaped slots in the inside lateral surfaces of said recesses forming T-shaped slots when the blocks are in operative position, and metal clips engaging the retaining portions of opposed slots and bridging said recesses rearwardly of said member to lock the blocks in position.

2. The combination with a hollow tubular member adapted to be protected from heat, of a pair of refractory blocks having rearwardly extending projections providing recesses in each of the blocks receiving said member and L-shaped slots in the inside lateral surfaces of said recesses, said slots comprising retaining portions parallel to the bottoms of the recesses and entering portions at the edges of the. blocks, said blocks being placed with the entering portions of the slots in abutting relation whereby to form T-shaped slots, and metal clips engaging the retaining portions of opposed slots and bridging said recesses rearwardly of said member to lock the blocks in position, said clips being separately insertable and removable through the abutting entering portions of the slots.

3. The combination with a hollow tubular member adapted to be protected from heat, of a pair of refractory blocks having rearwardly extending projections providing recesses in each of the blocks receiving said member and L-shaped slots in the inside lateral surfaces of said recesses, said slots comprising retaining portions parallel to the bottoms of the recesses and entering portions at the edges of the blocks, said blocks being placed with the entering portions of the slots in abutting relation whereby to form T-shaped slots, and metal clips engaging the retaining portions of opposed slots and bridging said recesses rearwardly of said member to lock the blocks in position, the entering portions of the slots in individual blocks being narrower than said clips and the abutting entering portions of adjacent blocks providing an opening at least as wide as the clips whereby to permit insertion and removal of the clips.

4. The combination with a metal tube of a non-metallic refractory block having rearward projections providing a recess receiving the tube, L-shaped slots on the inside lateral surfaces of said recess, said slots having entering portions at the edge of the block and opposed retaining portions substantially parallel to the bottom of the recess, a metal clip engaging the retaining portions of said slots and bridging said recess rearwardly of the tube to lock the tube loosely within the recess, and plastic refractory material between the walls of the recess and the tube.

5. The combination with a metal tube of a pair of non-metallic refractory blocks having rearward projections providing a recess in each block receiving the tube, opposed L-shaped slots on the inside lateral surfaces of said recesses forming T-shaped slots where the blocks are placed together in operative position, metal clips engaging the slots and bridging the recess rearwardly of the tube to lock the tube loosely within each recess, and plastic refractory material between the walls of the recesses and the tube.

6. A non-metallic refractory block having a main body portion and rearwardly extending projections providing between the projections a recess U-shaped in cross section for the reception of a. tubular member to which the block is to be attached and confronting slots in the inside lateral faces of said projections, said slots being situated outwardly of the curved bottom portion of said recess and comprising retaining portions parallel to the bottom of the recess and entering portions at a side face of the block, said retaining portions having substantially greater extent transversely of the block than the transverse width of said entering portions, whereby to provide retaining surface for engagement with a retaining member of substantially greater width than the width of said entering portions and said entering portions at the side face of the block being adapted to register with the entering portions at the side face of an adjacent similar block to provide passages of sufficient width for the insertion and removal of said retaining member.

7. A, non-metallic refractory block having a main body portion and rearwardly extending projections providing between the projections a recess U-shaped in cross section for the reception of a tubular member to which the block is to be attached, said block having side faces formed for full contact of the block with similar adjacent blocks over the full side face areas of said body portion and said projections, and confronting L-shaped slots in the inside lateral faces of said projections, said slots being situated outwardly of the curved bottom portion of said recess and comprising retaining portions parallel to the bottom of the recess and entering portions at one side face of the block, said retaining portions having substantially greater extent transversely of the block than the transverse width of said entering portions, whereby to provide retaining surface for engagement with a retaining member of substantially greater width than the width of said entering portions and said L-shaped slots being adapted to register with similar L-shaped slots in an adjacent block to form T-shaped slots having branches for the insertion and removal of retaining members of greater width than the width of the entering portions of the L-shaped slots.

ANDREW S. BARKER.