US1686976A - Furnace wall - Google Patents

Description

N N. E. LEWIS ETAAL FURNACE WALL 4 Filed May 29. 1920 7 Sheets-Sheet l `llllllllllllllllllf/w IN VEN TORS Oct. 9, -1928. 1,686,976

N. E. I Ewls ET AL FURNACE WALL Filed May 29. 1920 'T'Sheets-Sheet 2 l A TTORNEYS.

Get. 9, 1928. 1,686,976- N. E. I Ewls ET AL FURNACE WALL Filed May 29, 19.20 7 snxeeishee)c 5 /////,Y l/ EL v /////////////1 gr Oct. 9, 1928.

N. E. LEWIS ET AL FURNACE WALL Filed May 29. 1920 '7 Sheets-Sheet 6` VENTO/a5 BY my; 9' ZV MA TTI/(wiys.

Oct. 9, 1928. 1,686,976

N. E. LEWIS ET AL .l

FURNACE WALL Filed May 29. 1920 '7 Sheets-Sheet '7 EN TORS l BY My. m

A TTORNEYS.

Patented Oct. 9, 1928.

UNITED STATES Y 1,686,916 PATENT OFFICE.

NATHAN E. LEWIS, OF PLAINFIELD, AND HOWARD J.

KEER, F BAYONNE, NEW JER- SEY, ASSIGNOBS TO VTHIE. BABCOCK & WILGOX COMPANY, OFA BAYONNE, NEW II'EB-v SEYYL A CORPORATION OIE NEW FUBNACE WALL.

Application led Hay 29,

Our invention relates to a suspended overhanging furnace wall or arch which bows inwardly toward the fire, the curved portion of which is built up of wedge-shaped refractory members;v All of the refractory members in such curved portion are preferably of the same size and shape, which results in the inner or fire side of the wall or arch forming a portion of the surface of a cylinder.

@ne of the objects of our invention is to provide a means for continuing `the front furnace wall upward and inward so as to allow a stoker set beneath the front wallA to come farther forward'with respect to the boiler than it would should a vertical wall be employed.

Another object of our-invention is to provide, in combustion arch constructions, a

means for carrying the inner end of the combustion arch upward and toward the rear. An important advantage in some cases is that the uppermost side of the refractory members at the top of the overhanging wall may be made to come i'n a horizontal plane, on which tile or lire brick f may belaid for continuing the wall upward.

In the accompanying drawings, we'have illustrated several forms or applications of our invention which we have chosen for purposes of illustration.

In the drawings, Figure 1 is a longitudinal section through a portion of the furnace'wall and associated parts showing one form of our invention; Fig. 2 is a perspective view of a form of support which may be used with our invention, the form illustrated embodying also a plate which may be used, if desired; Fig. 3 is a perspective view of one of the tiles used in the illustrative forms of our invention; Fig. 4 is a sectional view similar to Figure 1 and showing a slightly modified form of -our invention;

Fig. 5 is a detail side elevation of the supporting member shown in Figure 4 with the wall and mud drum in dotted lines;

Fig. 6 isa plan view of Figure 5 and Fig.

7 is a section on the line 7-7 of Figure 5 looking in the direction of the arrows; Figs.

8. 9 and 10 are sectional views similar to Figure 1 and each showing a slightly modified form of our invention.

In the drawings, in which like reference characters indicate like parts, 10 is a furnace 1920. serial 1ro. 385,118.

wall, here illustratedas a front furnace wall,

beneath which is disposed a stoker 11, which is here shown as of the underfeed type. Above the furnace chamber are' disposed horizontally inclined boiler tubes, which are here shown as comprising two banks, 12 and 12a, connected at one end to headers 13 and l 13a, respectively, the upper and lower headers being nippled together," as` at 14, in the usual manner. A mud drum 15 is disposed beneath Vthe lower header 13a and is nippled thereto, as at 16, and is preferably provided with the usual blow-off connection 15a. A roof baille 17 is disposed above the lower bank of tubes 12a.

In the form illustrated in Figure .1, an overhanging wall 18 is seated on the main wall 10 and extends inwardly and upwardly therefrom between the furnace chamber and the mud drum and the associated parts of the boiler. This wall, in the form illustrated, is made up of a seriesv of wedgeshaped tiles'19 arranged `so that they are all ofthe same size and shape, and so as to produce a wall having a cylindrical surface for at least a portion of its length. Each vertical row of tiles is suspended on a support 20 which, as shown best in'Figure 2, is provided withl a rib the tiles being provided with recesses 30 on either side thereof adapted to fit around the head 28. Preferably, the tiles are also provided with a rib or bead 31 and an op posingrecess 82 arranged to interlock the tiles which are' placed side by side. On the rib v27 and at either end thereof are provided - hooks 21 and 22. As shown best in Figure f1, the hook 21 engages with a hook 23 attached by the band 24 t'o the nipple 16. Similarly the lower hook 22 is adapted to engage the flange'of abeam 25 extending across the Wall. In the `form shown in Figure 2, the head 28 is extended in the form shown`at 29 to provide a flat member which will rest against an angular portion 1()b of the top portion v10a of the wall 10.

It will be noted that the vertical thrust of the overhanging wall is carried by the direct pressure of the lowermost tile 27 and a head 28,'

partly v which abuts against the portion-108L of the so arranged that none of the weight or vertical thrust of the wall is imparted to the hook 23.

With the arrangement shown, the top of the overhanging wall formed by the' topnlost tile is horizontal, and on it tile or lire brick, such as shown at 34, may rest to form a seal in connection with a plate 33 connected to the boiler parts. i

In the construction just described, it will be obvious that the tiles may move either vertically or horizontally as the wall expands from the heat, and that, by reason of the manner in which it is supported, the overhanging wall permits the placing of the stoker further forward than would otherwise be possible, andyet at the same time a wall is provided which may be easily maintained in good condition in spite of the heat to which it is subjected. The metallic supports are protected from the heat of the furnace by the tiles 19, and where it is desirable to ventilate the outer surfaces of the wall, the portion of these supports which extends beyond the tiles as to the left of Figure 1, may be narrow strips just broad enough to support the hooks 21, 22.

For some purposes it is desirable to form the wall with a continuous, metallic surface, and this is particularly true where it is desirable to make Aa wall which wil-l be airtight under all conditions, and particularly when, by reason of the motions of the tiles 19, because of the heat to which they are subjected, openings may be formed between such tiles. This purpose may be accomplished by providing a plate 20 on the rib 27, as shown best in Fig. 2, these plates be ing wide enough to cover the distance between lsuccessive supports and preferably, being provided with recesses 251 alone either edge and on alternate sides of the pIate 20, as shown in Figure 2, so that when two of such plates are placed side by side, the projection of one will engage in the recess 251 of the other. As such^plates expand and slide along the hook 23 and the beam 25, the joint between them will be maintained by reason of the provision of the recess 251, thus providing a substantially air-tight outer covering for the wall.

' 20a are provi In, the modified form of our invention, shown in Figures 4, 5, 6. and 7, the supports ed with upwardly extending brackets 35 which engage the mud drum 15 on its front side, and thus hold the sup- -ports 20a and the tile 19a connected thereto, in position. The construction of the' rib and head of the support is the same as that shown in Figure2, and the tiles are supported thereon in the manner shown in Figure 1. In this'form of our invention, the seal at -the upper end of the auxiliary or overhanging wall is formed of poured material, hooks 36 beingprovided on the sup- .ports 20a, and supported by these hooks is a plate 37 which carries the material 38 to form the seal, such material being. poured into the space between the plates 37, the supports 20a and against the headers 13.

In the form shown in Figure 8, the supports 201 are carried on lugs 211 and 221 hooked over the flanges of I-beams forming part of the furnace setting, the wedgeshaped tiles 19 attached to these supports abutting against the tiles 192 which form an overhanging arch supported on the members 253, 254.

In the form shown in Figure 8, a single tile 331 is laid on top of the` straight tiles 191 forming the upper part of the wall supported on the plates 3201, and refractory material 381 may be placed between the lower portion of the header 13 and the tile 331 to seal the joint.

In the form shown in Figure 9, which in general is the same as that shown in Figure 8, the wedgeshaped tiles 19 form a wall which overhangs the furnace to a greater extent than that shown in the preceding figures, and rest against a key tile 193 between the flat tiles 194 and the'wedge-shaped tiles 19.,

In the form shown in Figure 10, the front wall is substantially the same as that heretofore described, the supports 203 being provided with hooks 212 and 222 to engage flanges of I-beams in the boiler setting, and the overhanging wall formed by the tiles 19 rests against a main wall 10 extending across the setting. In this form of our invention, a rear overhanging wall is also shown formed of supports 204 having a stiffening rib 205 and lugs 213 and 222, these latter engaging Il-beams extending across the boiler setting, and tiles 19, which are suspended on the supports 204, resting against the bridge wall 101. The upper part of the supports 204 are protected by tiles 195 which are eX- tended to the lower part of al baffle 501.

It will be apparent that when an auxiliary wall extends inwardlyat an angle to the main furnace wall, the thickness of the main wall may be determined solely by furnace considerations, if theauxiliary wall is constructed in accordance with our invention, andthe main wall may, therefore, be made of less thickness than when an auxiliary wall is built up entirely from the main wall as a protection to the mud drum and associated parts, as has hitherto been done at times. This is a. particular advantage where it is desirable to install larger capacity stokers and accordingly limit the thickness of the main wall.

By using the curved supports and the `wedge-shaped tile we provide a means by sol which will thus Support the weight of the tile while at the same time the overhanging wall is free to adapt itself to the relative movements between the boiler parts and the main wall without damage to the auxiliary wall. In our form of auxiliary wall the iron work is thoroughly protected from the heat of the furnace so that the trouble which has been experienced heretofore in overhanging walls, by reason of the burning off of the nose tile and the corresponding exposure of the iron work, is avoided.

It will also be obvious that by the use ofV on the boiler parts or on the iron work of ranged to cover the setting.

We claim l. In a furnace for a steam boiler, a relatively fixed wall and an auxiliary wall ex-` tending upwardly from the fixed wall and inclined to the vertical with its top substantially horizontal, said auxiliary wall com prising a series of metallic supports extending upwardly along the auxiliary wall and tile attached to the supports with the tile between the furnace and the supports, said tile being free to move longitudinally of said supports with the lowermost tile abutting against the fixed wall.

2. In a furnace for a steam boiler, a relatively fixed wall and an auxiliary wall extending upwardly fronr the fixed wall and inclined to the vertical with its top substantially horizontal, said auxiliary wall comprising a series of metallic supports extending upwardly along the auxiliary wall and tile attached to the supports'with the tile between the furnace and the supports, said tile being free to move longitudinally of said supports withthe lowermost tile abutting against the fixed wall, and refractory material supported on the top of the wall and arthe ends of the supports.

3. In a furnace for a steam boiler, a relatively fixed walland an auxiliary wall extending upwardly from the fixed wall and inclined to the vertical with its top substantially horizontal, said auxiliary wall comprismg a series of curved metallic supports and tile attached to the convex side of the supports with the tile between the furnace and the supports, said tile being free to move `longitudinally of said supports in a generally vertical direction.

4. In'afurnace for a steam boiler, a relatively fixed wall and an'auxiliar wall extending upwardly from the fixe wall and inclined to the vertical, said auxiliary wall comprising a series of curved metallic supports extending upwardly along the auxiliary wall, and tile attached to the supports with the tile'between the furnace and the supports, said tile being free to move longitudinally of said supports, with the lowermost tile abutting against the fixed wall.

5. In a furnace for a steam boiler', a relatively fixed wall and an auxiliary wall extending upwardly from the fixed wall and inclined to the Verticahsaid auxiliary wall comprising a series of curved metallic supports Y extending upwardly along the auxiliary wall, tile attached to the supports with the tile between the furnace and the supports, said tile being free t-o move longitudinally of said supports, with the lowermost tile abutting against the fixed wall, and refractory material supported on the top of the wall and arranged to cover the ends of the supports.

6. In a furnace for a steam boiler, a relatively fixed wall and an auxiliary wall extending upwardly from the fixed wall and inclined to the vertical with its top substantially horizontal, said auxiliary wall comprising a series of curved metallic supports and tile attached to the convex side o'f the supports with the tile between the furnace and the supports, said tile being free to move longitudinally of said supports in a generall vertical direction, and refractory materia supported on the top ofthe wall and arranged to cover the ends of the supports.

7. In a furnace for a steam boiler, a series of metallic supports spaced across the furnace and extending upward at an inclination to the vertical, each support being provided with hooks engaging the metal-work of the furnace and arranged to permit the supports to move laterally on the metalwork, and tile attached to the .supports with the tile between the supports andthe furnace, said tile being free to move on the supports in a generally vertical direction and the topmost tile being substantially horizontal.

v 8. In al furnace for a steam boiler, a series of metallic supports spaced across the furnace and extending upward at an inclination to the vertical, each support being provided Awith hooks engaging the metal-work of the furnace and arranged to permit the supports to move laterally on the metalwork, tile attached to the supports with the tile between the supports and the furnace, said tile beinoxfree to move on the supports in a generally vertical direction and the topl most tile being substantially horizontal, and a refractory material supported on the topmost tile and arranged to cover the ends of the metallic supports.

9. In a furnace for a steam boiler, a series of metallic supports spaced across the 4furclination to the vertical, suspension devices for the supports arranged to permit free relative movement ofthe supports across the furnace, tile attached to the supports with the tile between the supports and the furnace, said tile being free to move on the sup-,

ports in a. generally vertical direction and the topmost tile being substantially horizontal, and a refractory material supported on the topmost tile and arranged to cover the ends of the metallic supports. A

11. In a furnace for a steam boiler, a series of metal plates placed side by side to form the outer face of a wall, each plate extending upwardly at an inclination to the horizontal, a rib on each plate and extending longitudinally thereof, and tile supported on each rib and freely movable longitudinally thereof.

12. In a furnace for a steam boiler, a series of metal plates placed side by side to form the outer face of a wall, each plate being relatively narrow7 and extending upwardly at an inclination to the horizontal, a rib on each plate and extending longitudinally thereof, and tile supported on each rib and freely movable longitudinally thereof, the plates being provided with overlapping edges at their adjacent edges to form an air seal.

13. In a furnace for a steam boiler, a series of metallic supports spaced across the furnace and extending upwardly at an inclination to the vertical, each support having a longitudinal T-shaped rib, and tile having T-shaped recesses engaging each rib and freely movable along the ribs, the topmost tile being substantially horizontal.

14. AnA overhanging furnace wall comprising aseries of metal supports spaced across the furnace and a plurality of separate tiles connected to said supports on the side adjacent the furnace and arranged in horizontal rows extending across the furnace, the tiles in each row being alike in size and shape and the tile in some of the rows being wedge shape in the plane at right-angles to the line of direction of the rows with the small end ofl the wedge away from the furnace, whereby a substantially tight wall is formed extending inwardly and upwardly with respect to the furnace.

15. An overhangin'g furnace wall comprising a series of supports and tiles conreseeve nected tosaid supports between the supports and the furnace, all of the tiles being alike in shape and size and each tile being wedge shape ina plane extending in the direction of the overhang, with the small end of the wedge away from the furnace, whereby a substantially tight wall is formed extending inwardly and upwardly with respect to the furnace.

16. An overhanging furnace wall comprising a series of supports spaced across the furnace, each support being curved upwardly and inwardly with respect to the furnace, and a plurality of tiles connected to each support between the support and the furnace, the tiles being alike in shape and size and beingwedge shape in a plane parallel to the plane of the curve of the support, with the small end of the wedge away from the furnace, whereby a substantially tight wall is formed extending inwardly and upwardly with respect to the furnace.

17. An over-hanging furnace wall compris-v ing a series of supports spaced across the,

furnace, each support extending inwardly and upwardly with respect to the furnace, and a plurality of tiles connected to each support between the support and the furnace, some of the tiles being wedge shape in a plane parallel to the line of direction of the support, with the small end of the wedge away from the furnace, whereby a substantially tight wall is formed extending inwardly and upwardly with respect to the furnace. f

18. In a furnace for a steam boiler. having horizontally inclined tubes connected to water chambers at either end, an overhanging wall extending inward and upward from a point outside the vertical plane of one of the water chambers to a point inside such vertical plane and in front of some of the boiler parts, and connections between the overhanging wall and fixed points outside the overhanging wall to resist the overturning of the overhanging wall.

19. In a furnace for a steam boiler having horizontally inclined tubes connected to water chambers at either end, an overhang ing wall extending inward and upward from a point outside the vertical plane of oneof the water chambers to a point insfde such vertical plane and in front of some of the boilerparts, and connections between the Ov'erhanging wall 'and some of the boiler parts outside the overhanging wall to resist the overturning of the overhanging wall.

20. In a furnace for a steam boiler having horizontally inclined tubes connected to water chambers at either end, a fixed wall outside the vertfcal plane of one of the water chambers, an overhanging wall extending inward and upward from the fixed wall to a point inside such vertical plane and in front of some of the boiler parts, and connections lll between the overhanging wall and fixed points outside the overhanging wall to resist the overturning of the overhanging wall.

2l. In a furnace for a steam holler having horizontally inclined tubes connected to water chambers at either end, a fixed wall outside the vertical plane of one of the water chambers, an overhanging wall extending inward and upward from the fixed wall to a point inside such vertical plane and iu front of some of the boiler parts, and connections between the overhanging wall and some of the boiler parts outside the overhanging wall to resist the overturning of the overhanging wall.

22. In a vfurnace for a steam boiler having horizontally inclined tubes connected to water chambers at either end, a vertical wall below one of the water chambers, an overhanging wall,l extending from the vertical wall inwardly toward the furnace chamber and upwardly to a point in front of some of the boiler parts, and connections between the overhanging wall and fixed points outside the overhanglng wall to resist the overturning of the overhanging wall.

23. In a furnace for a steam boiler having horizontally inclined tubes connected to water chambers at either end, a vertical wall below one of the water chambers, an overhanging wall extending from the vertical wall inwardly toward the furnace chamber and upwardly to a point in front of some of the boiler parts, and connections between the overhanging wall and some of the boiler parts outside the overhangng wall to resist the overturning ofthe overhanging wall.

24. In a Stoker-fired furnace for a boiler having horizontally inclined tubes connected to water chambers at either end, a wall extending across thc furnace above .the Stoker, an overhanging wall extending from said wall inwardly toward the furnace and upwardly to a point in front of some of the boiler parts, and connections between the overhanging wall and fixed points outside the overhanging wall to resist the overturning of the overhanging wall.

25. In a Stoker-fired furnace for a boiler having horizontally inclined tubes connected to water chambers at either` end, a wall extending across the furnace above the stoker, an overhanging wall extending wall inwardly toward the furnace and upwardly to a point in front of someof the boiler parts, and connections between the overhanging wall and some ofthe boiler parts outside t-he overhanging wall to resist the overturning ofthe overhanging wall.

26. In a furnace, a wall supported at one end curved in a generally upward direction, with its convex side toward the furnace chamber, said wall comprising wedge-shaped tile with the smaller end of the wedge away from .the lire, and means outside the wall to Iprising wedge-shaped tile with the smaller from said hold said wedge-shaped tile in position in the wall.

27. In a furnace, a wall curved in a generally upward direction, with its convex side y toward the furnace chamber, said wall comprising wedge-shaped tile with the smaller end of the wedge away from the fire, and means outside the wall to hold said wedgeshaped tile in position in the wall and t0 permit said tile to move vertically.

28. In a furnace, a wall curved in a generally upward direction, with its convex side toward the furnace chamber, said wall comprising wedge-shaped tile with the smaller end of the wedge away from the fire, means outside the wall to hold said wedg -shaped tilein position in the wall and to permit said tile to move vertically, and an abutment to assist in resisting the horizontal component of the weight' of said wedge-shaped members.

29. In a furnace, a wall curved in a generally upward direction, with its convex side toward the furnace chamber, said wall comend of the wedge away from the fire, and means outside the wall to hold said wedgeshaped tile in position'in the wall, at least a part of the curve being an arc 0f a circle and all of the tile in a vertical row on such, arc being of the same size and shape in crosssection perpendicular to the face of the wall.

30. In a furnace, a wall curved in a generally upward direction, with its convex side toward the furnace chamber, said wall comprising wedge-shaped tile with the smaller end of the wedge away om the fire, and means outside the 'wall to hold said wedgeshaped tile in position in the wall, the tile in a vertical row on the curve being of theI same size' and shape in cross-section perpendicular to the face of the wall.

31. In a furnace, a wall curved in a generally upward direction, with its convex side toward the furnace chamber, said wall comyIl" prising a plurality of metallic members and wedge-shaped tile supported on said members between the fire and the metallic members with the smaller end of the wedge away from the fire, said wedge-shaped tile being 115` free to move vertically on said metallic members.

32. In a furnace, a wall curved in a generally upward direction, with its convex side toward the furnace chamber, said wallcom- 19 prising a plurality of metallic members and wedge-shaped tile supported on said members between the fire and the metallic mem- `,bers with the smallerend of the wedge away from the fire, said wedge-shaped tile being free to move vertically on said metallic members, and an abutment vto assist in re-l sisting the horizontal component of theweight of said wedge-shaped members.

33. Ina furnace, a wall extending upward 1310 and inward toward the furnace chamber, at least a portion of said wall being curved with the convex side toward the furnace chamber, said curved portion of the wall comprising wedge-,shaped tile with the smaller end of the. wedge away from the fire, and means to resist the overturning moment-of the wall and to hold said wedge- Shaped tile in place.

34. lin a furnace, a wall extending upward and inward toward the furnace chamber, at least a portion of said wall being curved with the convex side toward the furnace chamber, said curved portion of thewall comprising wedge-shaped tile with the smaller end of the wedge away from the fire, a plurality of metallic members outside the wall engaging the tile to support them` and arranged to permit vertical movement of the tile, and means outside the wall to resist the overturning moment of the wall.

35. In a furnace, a wall extending upward and inward toward the furnace chamber. at

-least a portion of said wall being curved with the convex side toward the furnace chamber, said curved portion of the wall comprising wedge-shaped tile with the smaller end of the wedge away from the lire, and means to resist the overturning moment of the wall and to hold said wedge-shaped tile in place, said wedge-shaped tile being of the same `shape and size in cross-section perpendicular to the face of the wall.

36. in furnace arch construction, a combination comprising bars having arcuate tile retaining members arranged to overhang a portion of the grate, and wedgeshaped tile supported on said retaining members with the converging faces of juxtaposed tile in contact and facing toward the extremities of the bars, the broader end faces gf the tile forming a fire resisting wall surace.

37. in furnace structures, an arch nose composed of a plurality of bricks arranged fantail-wise, and means for detachably supporting the same.

38. lin furnace structures, an arch nose comprising a plurality of substantially vertically disposed supporting members, and nose brick carried thereby, each member having a tier of such brick. i 39. lin furnace structures, an arch nose comprising a plurality of substant-ially vertically disposed supporting members, and nose brick detachably carried thereby, each member having a tier of such brick.

40. In a furnace, a wall curved in a gcnerally upward direction, with its convex side toward the furnace chamber, said wall comprising wedge-shaped tile with the smaller end of the wedge away from the fire and means to hold said wedge-shaped tilein position in the wall and to permit said tile to move vertically.

41. lin a. furnace, a wall curved in a generally upward direction, with its convex side toward the furnace chamber, said wall comprising wedge-shaped tile with the smaller end of the wedge away from the fire and means to hold said wedge-shaped tile in position in the wall and to permit said tile to move vertically, said means comprising metal parts protected from the heat of the furnace by said tile.

42. fn a furnace, a baiiie wall support, a bafiie wall built up of blocks carried on said support, and ribs interlocked with the blocks of said wall, the said ribs, at their lower ends, being fulcrumed on said support and the preponderance of weight of the wall being on a common side of the ribs.

43. In a furnace, a baflie wall support,'a baiie wall built up of blocks carried on said support, and ribs interlocked with the blocks of said wall, the said ribs, at their lower ends, being fulcrumed on said support and the preponderance of weight of the wall be.- ing on a common side of said ribs, said blocks having interlocking engagement wit-h said ribs.

44. in a. furnace, a baie wall support, a baffle wall on said support, built up of blocks and including rupright metallic ribs interlocked with certain of the blocks thereof and movable with the wall formed of said blocks.

45. In a furnace, an upwardly and inwardly extending curved baiiie wall with its convex side toward the furnace chamber, said wall comprising fulcrumed supports and refractory material connected thereto and means to resist the overturning moment of the wall, said wall being gravity-held against said means. 46. ln a furnace, an upwardly and inwardly extending curved baifle wall with its convex side toward the furnace chamber. said Wall comprising oscillatory supports and blocks carried on said supports and means to resist the overturning moment of the wall, said wall being gravity pressed against said means.

47. ln furnace arch construction, the combination of a beam disposed above a portion of the furnace chamber, collaterally arranged frame members depending from the beam, wedge shaped tile suspended from said frame members with their broader ends toward the furnace chamber and their lateral faces juxtaposed, to form an upwardly deflected convex refractory arch portion.

48. In furnace arch construction, the cornbination of a beam disposed above a portion of the furnace chamber, coliaterally arranged frame. members depending from the beam. wedge shaped tile suspended from said frame members with their broader ends toward the fuinace chamber and their lateral faces juxtaposed, to form an upwardly tically disposed porting the deiected convex refractory arch portion, and refractories supported on the upper tile to form a vertical wall portion as an upward continuation from said convex portion.

4:9. In furnace arch construction, means comprising wedge shaped tile arranged with their broaderY ends toward" the furnace chamber and their lateral faces juxtaposed, to form an upwardly deflected convex refractory arch portion, means for supporting said arch portion, the `parts being constructed and arranged to accommodate expansion of said arch portion at one end.

50. In furnace arch con/struction, means comprising wedge shaped tile arranged with their broader ends toward the furnace chamber'and their lateral faces juxtaposed, to form an upwardly deflected convex refractory arch portion, means for supporting said arch portion, the parts being -constructed and arranged to accommodate expansion at one end of said arch portion, and refractories supported on the upper tile to form a vertical wall portion as an upward continuation from said convex portion. l

51. In a furnace archconstruction, a combination comprising bars having arcuate tile retaining members arranged to overhang a a portion of the grate, and wedge-shaped tile supported on said retaining members with the converging faces of juxtaposed tile in con act and facing toward the extremities o the bars, the broader end faces of the tile forming a lire resisting wall surface, the parts being constructed and arranged to accommodate expansion of said tile at one end thereof.

52. An overhanging furnace wall comprising a series of metal supports spaced across the furnace and a plurality of separate tiles connected to said supports on the side adjacent the furnace and arranged in horizontal rows extending across the furnace, the tiles in each row being alike in size andr shape and the tile in some ofthe rows being wedge shape in the plane at right-angles to the line of direction of the rows with the small end of the wedge away from the furnace, whereby a substantially tight wall is formed extending inwardly and upwardly with respect to the furnace, the wedge shaped tile at one end of said row being movable to accommodate expansion of the arch. 'y 1 53. In furnace structures, an arch nose composed of a plurality of bricks arranged fantail-Wise, and means for detachably supsame, the parts being constructed and arranged to accommodate expansion ofsaid arch nose at one end.v

54. In furnace structures, an arch nose comprising a plurality of substantially versupporting members, and nose brick carried thereby, each member a tier of such brick, the parts being water chambers at either end, ali overhanging wall extending inward and upward from a point outside the vertical plane of one of the water chambers to a point inside v such vertical plane and in front of some of the boiler parts, and connections between theoverhanging wall and fixed points outside the overhanging wall to resist the overturning of the overhanging wall, the parts being constructed and arranged to accommodate expansion of said. overhanging wall at one end. l

57. In a furnace, a wall formed of refractory members, and a substantially air tight metallic member formed of a series of metallic plates forming substantially air tight expansible joints withl each other the plates being movable with respect to each other along a surface substantially .parallelto the face of the wall, said plates engaging said refractory members. v

58. In a furnace, a wall formed of refractory members, and a substantially air tight metallic member formed of a series of metallic plates forming substantially air tight expansible joints with each other, said plates slidably engaging said refractory members wherebythe latter may move relatively to said plate.

59. In a furnace, a wall comprising refractory members provided with recesses, and a substantially airtight metallic member formed of a series of metallic plates arranged in overlapping relation, said plates being provided with bulbed projections engaging the recesses of said refractory members.`

60. In a furnace, a wall comprising refractory members provided with recesses,

and a substantially air tight metallic member`formed of a series of metallic plates arranged in overlappin relation, said plates being provided with ulbed projections engaging the recesses of said refractory members, said refractory'members being freely movable along said bulbed projections.

61. In a furnace, a wall comprising refractory members provided with recesses, and a substantially air tight metallic member formed of a series of metallic plates arranged in overlapping relation, said plates being provided with ulbed projections engaging the recesses of said refractory members, said refractory members being freely movable along said bulbed projections, the

joints between said plates being arranged substantially at right-angles to said bulbed 5 projections, whereby both said wall and said metallic member are free to expand and contract relative to each other Without producing strain between the two.

62. ln a furnace, a Wall formed of refrac- U tory members, and a Substantially air-tight metallic member comprising a series of metallic plates engaging said refractory members, substantially air-tight expansible joints being formed between successive plates, the plates being relatively movable along a surface substantially parallel to the face of the Wall.

NATHAN E. LEWIS. HOWARD J. KEER.

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