US1517291A - Boiler and setting therefor - Google Patents

Description

'Dec. 1924. 1,517,291

D. S. JACOBUS BOILER AND SETTING THEREFOR Original Filed Feb. 17 1 22 5 Sheets-Sheet 1 V I I I I INVENTOR CWJM4 ATTORNEYS Dec. 1924- 1,517,291 D. s. JACOBUS BOILER AND SETTING THEREFOR Original Filed Feb. 17, 1922 5 Sheets-Sheet 2 INVENTOR QW1/f t1; ATTORNEYS D. S. JACOBUS BOILER AND SETTING THEREFOR Original Filed F 17, 1 22 5 Sheets-Sheet IN VEN TOR. 4g

/M A A TTORNEYS.

Dec. 2, i 24. I 1,517,291

' D. S. JACOBUS BOILER AND SETTING THEREFOR Original Filed Feb. 1'7 192 2, 5 Sheets-Sheet 4 E .L'EELlE- 9 w mTTORNES S.

D. .S. JACOBUS BOILER AND SETTING THEREFOR Original Filed Feb. 1'7 1922 5 Sheets-Sheet 5 INVENTOR. I

BY 9 1 V M I ATTORNEYS.

Patented Dec. 2, 1924.'

7 DAVI s. JACOBUS, 0E JERSEY cITY, NEW JERSEY, ASSIGNOR To EE EABcocx &

WILCOX ooMrANY, or BAYONNE, NEW JERSEY, A CORPORATION or NEW JERSEY.

BOIlZER AND SETTING T E-Eran. 7

Application filed February 17, 1922, Serial No. 537,154. Renewed A ril 25, 1924.

T 0 all whom it may concern.-

Be it known that I, DAVID S. Jacoevs, a

citizen of the United States, residing at P Jersey City, in the-county of Hudson and.

State of New Jersey,'have invented certain new and useful Improvements in a Boiler and Setting Therefor, of which the following is a specification. I

One of the objects of my invention isthe provision of novel means for ventilating furnace walls.

Other objects of my invention willappear in the specification and will be partic-.

ularly pointed out in the claims.

My present application is a continuation in part. of my application Serial No. 401,568,

which was filed in the Patent Otfice on or about August 6, 1920. D v

My invention will best be understood by reference to the accompanying drawings, in which like reference characters indicate like parts, and in'which Figure 1 is a longitudinal section through a boiler and its setting embodying. my invention; "Fig. 2 is asection taken on the plane of the line 2-2 "of Fig. 1; .Fig. .3 is a longitudinal section is a. side view, on an enlarged scale, of the similar to Fig. 1 but illustrating a boiler adapted for burning either oil or powdered fuel, or both; Fig. 4 is a vertical sectional wiew through a portion of the furnace wall and the outer walls spaced therefrom, and illustrating a modified arrangement for holding the walls in alinement and spaced relation; Fig. 5. is a plan view of special tiles of the inner and outer walls, respectively, illustrating a tie-piece in positionin the .tiles; Fig. 6 is a sectional view taken along the; plane of the line 6-6 of Fig. J Fig. 7 is a sectional elevation taken along the" plane of the line 'T? of Fig. 6; Fig. 8

tie and Spacing piece illustrated in Fig-.13;

, and spacing piece; Fig. 13 is a vertical sec-v tional view through a furnace wall and through a metallic casing spaced therefrom, anddllustratmg, means for holding the fur.-

nace wall and an outer. casing in spaced relation: Fig. 14 is a horizontal sectional view taken between two courses of bricks of two spaced walls and illustrating a. modified arrangement of tying the walls together; Fig. 15 1s a vertical sectional view through the wall of Fig. let and along one of the tietaken along the line 17--17 of Fig. 16; Fig. 6

18 is a plan view of one of the bonding tiles of the outer wall'of Figs. 16 and 17; Fig. 19

isa side view of the tile shown in Fig. 18; Fig. 20 is ahorizontal sectional vi w taken alongthe line 20 -20 of Fig. 21 and illustrating a modified arrangement for holding two walls in alinen ient and in spaced relation; Fig. 21 s a vertical sectional view takenalong'the line 21-21 of. Fig. 20; Fig. 22 is a vertical sectional view, similar to Fig.

'21 but illustrating both walls inclined, and Fig. 23 is an elevation, taken from within the furnace, of the parts illustrated in Fig.

. Figs. 1 and :2 illustrate a boiler of the 0 series type embodying my invention, which is fired by astoker 83, which is here shown as of the underfeed type. The gases are directed from thefurnace chamber 84 by the roof baffle 85 over the intermediate wall 5 lower part of the wall 86 is thickened and v forms a shelf, at 86. which comes beneath Fig. 9 is a plan'view similar to Fig. 5, illusthe rounded ends of the tubes, thus forming a support for the other end of the boiler.

The bent ends of the tubes are also supported by members 86" projecting from the wall and bythe spacing strips 39. Hooked members 86 also extend from the bonding tiles 86 and engage the looped ends of the tubes, thereby holding the wall in position? From this flue the gases are directedto the outlet flue 92, dampers 93, operated by-connectionsextending to a pointwit-hout the boiler, being provided for controlling the water passes to the feed tank'9'8 by a'pipe 99. In the form here illustrated, the-lower end of the pipe 99 is preferably formed with a perforated-loop 100 near the bottom of the feed-water tank, so that the heated water will mingle with the water in the feed tank. The pipe 99 has a throttling-valve 101 to effect the regulation. Y

A steam pump 102 draws the feed water from the feed tank 98 through the pipes 103 and forces it through the pipe 104 to the lowermost header of the boiler. The steam and water-in the. boiler tubes flows upward,

accordingly, in a direction opposite to the -flow of the gases,

so that .the counterflow principle is established.

'In accordance with my invention, the air which isused in-the stoker, orother fuel-' burning device, is preferably passed over the setting of the boiler, in order to utilize any heat radiated thereby and, at the same time, to cool the walls. Acasing 105 is, accordingly, provided around the setting and spaced therefrom on its sides, and .in front and above the boiler, as shown. .The walls 21 are built up in part of horizontal. rows tile are placed near together, to hold the of grooved bonding tiles 21; The bonding tiles are held by cast-iron pieces which'engage the grooves of the tiles and which, in

turn, engage with the horizontal fixed stif femng members 21. 'The rows .of bonding wall ;,in ,complete alinement. Cast-iron pieces 21."are so arranged that the may slide from side to-side overthe horizontal members 21", and are so constructed that the wall can expand upward without causing them to bind and bring excessive strain on the bonding tile. The wall may, therefore,

expand in both directions without producing any great strain on. the bondin which the wall can be kept in alinement without breaking the bonding tile. The

' upper part of the casing was held in saline 'sides. This we means of the horizontal rows of 'bo'nding ment by means of vertical members21f. attached to and spaced at intervals along the horizontals stiffening .members 21". The

transverse wall 86 (indicated above the wall tile shown in cross-section at 86.

By extending the metallic connecting memhers across the air space,.th'e flow of the air 'used for cooling the walls keeps the metallic members cool.

the air in the way described,

tile, and an arrangement is, thereby provi ed in' I 105 which are Air is forced into the space between the setting and the casing at the rear of the wall 86 and at the bottom of said space by a fan 106, which takes the 'air from outside the casing; The air is forced upwardly downwardly over the si es, and front of circulating 1t 'flows ina generally reverse direction to the flow of the hot gases, and the coolerair comes in contact with the coolest part of the setting.

From the fan 107'the air passes to the the furnace to the fan 107. By

stoker, exceptfor a small part, which is supplied to the furnace side-wall cooling device 108. ,By providing the two fans, as ,described, the air may be circulated over the setting without undue leakage through the walls, as the fans may be operated to giveanydesired pressure in the space between the casing and the walls.

The boiler illustrated in Fig. 3 is, ingeneral, similar to that shown-inFig. 1, but is. adapted for burning either oilor pow- (lered fuel, or both, the oil-burners being indicated at 109 and the powdered-fuel apparatus at 110, a suitable refractory lining 111 for the furnace chamber being-provided, against which the flame 'or, the fuel cloud, as the case may be, impinges.- ure, the'intermediate cross-wall 112 is of a -slightly modified form, to accommodate itself to the refractory lining 111. The air circulation is here maintained b a single fan 113, which takes air from t 1e outside In this figthrough a flue 114 and forces itaroundthe setting, in the manner described inconnecapparatus 109 or the powdered-fuel apparatus 110, as indicated by arrows. "A passage 115, in this construction, conducts a regulated amount of air from the fan 113' to the furnace chamber 116,.the regulation being secured by adjusting the damper 115". Bonding tiles 21" and 86 are placed in the furnace walls 21 and 86, respectively, to hold them in alinemenh The cast-iron pieces 21, which engage withthe bondin tiles, hook lover the edges of horizonta Z-bars which are attached to the outer casing. The air which is forced between the walls and the casing, passes between the cast-iron pieces 21% The casing is reen-v forced by the horizontal stiffening members placed outside of the casing. Figs. 4, 5,6, 7 8 and 9illustrate a device in accordance with my invention for holding two walls in alinement and in spaced rela tion. The furnace wall 117 is provided with special'bonding tiles 118,,liavin recesses 119, in which the inner curve end 1 of the tie-piece 120 is received. The outer "nace walls, the cooling effect of the air .cir--- culated between the outer wall and'the furwhere the cooling effect, due to the circula- I wall 117 is similarly provided with special tiles 121 provided with recesses 122 in which the outer ends of the tie and spacing pieces 120 are received. The ends of the pieces 120 are so formed that they may be introduced into place in the outer wall after the latter is constructed. This would be done before building up the inner wall. \Vith 'the' arrangement illustrated in Fig. 4, the inner furnace wall is made thinner than standard furnace walls. By employing thin furnace walls is greater than it wouldbe with thicker furnace walls, as there is a less resistance to the passage of heat through the thinner walls. lVhere furnace temperatures are excessively high, the interior of the wall, that is, the furnace side of the wall, will fuse and slough off. By making the. inner furnace wall thin and layingu'p the same entirely of solid fire-brick, as illustrated, an excessive furnace temperature would simply thin the walls down to a point tion of the air, would check any further fuslng or sloughing off of the brick, as when the wall became sufliciently thin the inner against theside of the special tile.

In place of making the special brick or tile so that the tie and spacing pieces can be introduced after one of the walls is laid up, they may be made as indicated in Fig. 12

.in which the ends of the tie-pieces are bent more sharply than the tie-piece illustrated in Fig. 8 and in which the recess 12l of the s ecial tile 125 conforms to the bent end of t e tie and spacing piece 123. \Vith .such an arrangement, the tie and spacing pieces would be laid up with the walland could not be hooked in after the .wall is laid.

In Fig. 13 I have illustrated a further modification of my invention, in which the inner furnace wall is also thinner than in ordinaryconstructions and in which the wall is laid up of solid fire-brick and is spaced from an outer casing, the casing being particularly advantageous where the same is located above a stoker. Spacing pieces 123, which are preferably of the form best shown in Fig. 12, are formed ofa cylindrical iron piece bent at the ends, as indicated, so that one end engages a reccss 124'in a special tile 125, the opposite end of the spacing piece preferably being similarly bent and engaging an opening in an angle-iron 126 secured in the casing. In the claims, I have defined as a wall the member spaced from the furnace wall, and intend to cover by this term either an outer brick wall or a metal casing, or both. The form of brick and spacing pieces shown in Fig.6, in which it is possible to introduce the spacing piece after one work to that shown in Fig. 13.

In Figs. let and 15 -I have illustrated a further modified arrangement, in which one of the walls, preferably the inner wall 117,

is provided with special tiles 127, which project outwardly beyond the face of the wall and in which the special tiles 128 of the outer wall lli' 'may be formed similarly to those illustrated in Fig. 5. With the arrangement here shown, the tie-pieces 129 of the walls is laid, is preferable for most having bent ends, maybe inserted inthe outer wall and the opposite end then dropped into the recess of the special tile 127. 7

Figs. 16, 17, 1S and 19 illustrate a further modification, in which the inner and outer walls are provided with special tiles 130 and 131, respectively, which preferably abut.

against each other, as indicated. The tile I130 is preferably provided with a groove 130 formed with a vertical shoulderat 132, as illustrated in Fig. 17, while the tile 131 is preferably formed with a groove 133 similar in form to the groove 130 but extending only partially across the tile, as indicated in Fig. 16. A tie-piece 13-1 is provided on. its lower side with a recess 135 adapted to engage the inner ends of the tiles, as best shown in Fig. 17, and having shoulders 136 for engagement with the shoulders formed by the grooves on the two abutting tiles.

Figs. 20 and 21 illustrate a further modification of my invention in which the outer wall 137 -is vertically disposed and laid against a plate, or plates, 138, which engage vertical buckstays 139. The inner wall 140 is upwardly and outwardly inclined and is provided with separated spacing tiles 111' which lean against the inner face of the outer wall, so that the gravity .component of the inner wall serves to maintain the-outer wall in position. against-the buckstays and, at the same time, maintains the inner wall in spaced relation to the outer wall. 1

Figs. 22 and 23 illustrate still a further modification, in which the buckstays 139* are inclined and the outer wall 137 leans against the buckstays, the inner wall being provided with spaced tiles 1&1 which rest against the inner face of theouter wall to maintain the inner wall in alinement and in spaced relation to the outer wall.

The air which enters the furnace is preheated by contact with t-he boiler setting,

thus increasing the .efliciency of the furnace "and assisting in the maintenance of the setting by cooling the walls. \Vhat I claim and desire to secure by Letters Patent of the United States is:

1. 'In a steam boiler, a furnace and boiler setting, an outer wall spaced from the walls of said setting, a forced-blast fuel-burning stoker for'forcing a-ir thereto.

v 3. In a steam boiler, a furnace," a flue disposed beslde the furnace, a steam holler disposed withinthe flue, an outerwall from the'furnace and flue', andmeans for outer wall over the wallsof said flue and blast fuel-burning device therefor, a fine dispassing cooling air upwardly within said downwardly over 'the' walls of said furnace.

4. In a steam boiler, a furnace, a forcedp'osed beside said furnace, a steamboiler disposed within said flue, an outer wall spaced from the walls of said furnace, and means for forcing air within said outer wall upwardly over the walls of said flue and downa-rdly over the walls of said furnace to said fue'l burning device.

5. In a steam boiler, a-furnace, aforcedblast fuel-burning device therefor. a flue dis-' posed beside said furnace, a steanrboiler disposed within said'fiue, an outer wall spaced from the walls of said furnace, afanfor' forcing air within said casing upwardly over the walls of, said fine and downwardly over the walls of said furnace, anda second fan .disposed adjacent said stoker for forcing the air from the spa-cezwithinsaid casing to'said fuel-burning device. i

I 6. In a' steamboiler, a boiler setting,-an o1 1 ter;wall spaced from the walls of said setting, means for passing air-through the space between the two walls; the vertically extending walls of the setting comprising courses of blocks, one or. more of the courses having grooved blocks, afixed cross member and metallic tie-pieces cross member and the grooves of the blocks, and arranged to allow the blocks to move in any direction in a generally vertical plane, the tle-pieces assisting-in holding the walls in proper alinement, "I s 7. In asteam boiler, aboiler setting, .an outer wall spaced from the walls of said setting, means for passing air through the a fixed cross member and vdevice for said furnace, and means for pass--- spaced walls of the setting said first engaging the fixed space between said walls, the walls of the setting comprisingrourses of blocks, one or more ofthe courses having grooved blocks, metallic tie-pieces engaging the fixed cross member and the grooves of the blocks,- and arranged to allow the blocks to move 'inany direction in a generally vertical 'plane,- the tie-pieces assisting in holdin the wall in proper vegtical alinement, and means associated with said fixed member for maintaining said outer wall in alinement. 4 i

' 8. A setting for a boiler,

holdingthe wall in alinement', an outer wall spaced from the walls of said settin fixed supporting members engaging botl thebonding tile and the casing, and means for passing air throughthe space between said outer wall and the walls of the furnace.

outer wall, and a second fan located between said first fan and said fuel-burnin device for forcing air delivered from said first fan to said fuelburning device. '19. In asteam boiler and its setting, a -fucl-burning device, a flue enclosed by the for conducting gases from said fuel-burning device, a steam boiler located in said flue, an outer wall spaced from said furnace walls, afan located beneath the boiler floor for forcing air through the space between said furnace wall and said outer wall, and a second fan located between fan and said fuel-burning deviceand beneath the boiler floor for forcing air delivered from said first fan to said fuelburning device' 1151s a steam boiler and its setting, a

. fuel-burning device, a combustion chamber said gases 'passdownwardly, a steam boiler located in said flue. said combustion chamher and said flue being enclosed by the walls of said setting, an outer wall spaced from the walls of said setting, means forming with said veasingan air passage in the space between said outer wall and saidfurnace Walls and opposite said combustion chamber and said flue, and .a fan; for forcing air through said passage in a directionopposite to the flow of gases in said combustion chamher and said flue.

12. In a steam boiler and its setting, a fuel-burning device, a -combustion, chamber in which the gasesfrom said fuel-burning device passupwardly and a 'flue in which said *gases pass downwardly, a steam boiler comprising a i wall having parallel rows 'of bonding-tile for -.space between said furnace walls and said located in said flue, said combustion cham'-- her and said flue being enclosed by the walls of said setting, an outer wall spaced from the walls of said setting, means forming with said casing an air passage in the space between said outer wall and said furnacewalls and opposite said icombustion cham-' her and said'flue, a fan -for' forcing air from said first fan to said fuel-burning de-.

vice.

13. In a steam boiler and its setting. a'

fuel-burning devlce, a combustion chamber in which the gases from said fuel-burning device pass upwardly and a flue in which of said set-ting. an outer wall spaced front said gases pass downwardly, a steam boiler located in said flue.'said combustion chamber and said flue being enclosed by the walls the walls of said setting, means forming" with said casing an air passage mthe space between'saidouter wall and said furnace.

walls and opposite said combustion chamber and said flue. a .fan located beneath the boiler floor for forcing air through said passage in a direction opposite to the flow of gases in said combustion chamber and said flue, and a second fan located between said first fan and said fuel-burning device and beneath the boiler floor for forcing air delivered from said first fanto said fuelburning device.

14. In a steam boiler, a boiler setting. an outer wall spaced from the walls -.of said setting. the vertically extending walls .of;

the setting comprising courses of blocks, one or more-,of the courses having grooved blocks. a fixed cross member located between said furnace walls-and said outer wall, and metallic tie-pieces engaging the fixed cross member and'the grooves of the blocks, and

arranged to allow the blocks to move in any direction in a generally vertical plane. the tie-pieces assisting in holding the wall in proper vertical alinement, and connectionsbetween said fixed cross'member and said outerwall for holding. the latter in alinement, the parts being constructed and arranged to permit of the passage. of air vertically in the space within said casing.

15. In a steam boiler audits setting. a fuel-burningapparatus, a flue, a steam boiler having heating surface located. in said flue, a combustion chamber. the gases passing in opposite directions in said combustion chamber and said flue.- and means for conducting air over, the. walls-of the" setting enclosing said fine and said combustion chamber in opposition to the flow of gases therein to the fuel-b urning apparatus.

16. In a steam boiler and its setting. a

which cooling air may be ing fuel-burning apparatus, a flue, asteam' boiler having heating surface located in said flue, a combustion chamber. the gases passing upwardly in said combustion chamber and downwardly in said flue. and means for conducting-air over the walls of the setting enclosing said flue and said combustion chamber in opposition to the flow of gases therein to the fuel-burning apparatus.

17. In a steam boiler and its setting, a

furnace wall. a second wall spaced from said furnace wall and forming a, flue through which cooling air may be passed, means for maintaining both of said'wa lls in alinement and in spaced relation and permitting relative movement between the two, and means for conducting cooling air through the space between said walls. i

18. In a steann boiler and its setting, a furnace wall. a second wall spaced from said .furnace walland forming a flue through which cooling air may be passed, means for maintaining both of said walls in alinement and in spaced relation and permitting relative movement etwee n the two, and means for conducting cooling airthrough the space between said walls-and t0 the furnace.

19. In' a steam boiler and its setting, a furnace wall. asecondwall spaced from said furnace wall and ;.forming a flue. through passed, a fixed member located adjacent to said walls, and means cooperating with said fixed member formaintaining said walls in alinementandin spaced relation.

20. In a steam boiler and its setting, a furnace wall, a second wall spaced from said furnace wall and forminga flue througlr which cooling air may be passed. a fixed cross member located between said walls, and means associated with the respective walls and cooperating with said fixed memin spaced relation.

21. In a. steam her for holding said walls in alinement and boiler and its setting, a

thin furnace wall, a second wall spaced from said furnace wall and forming a flue through which cooling air may be passed, means for maintaining both of said walls in alinement and in spaced relation and permitting relative movement between the two, and means for conducting cooling air through-the space between said walls.

22. In a steam boiler and its setting, a furnace wall not more than ten inches in thickness. a second wall spaced from saidfurnace wall and forming a flue through which cooling air may be passed, means for maintainboth of said-walls in alinement and in spaced relation and permitting relative movement between the two, and means for conducting cooling air through the space between said walls.

K 23. In asteam boiler and its setting. a

furnace wall not more tlianxten inches in thickness laid up of solid fire-brick, a second wall spaced from said furnace wall and forming a flue through which cooling air may be passed, means for maintaining both of said walls in alinement and in spaced relation and permitting relative movement benaee wall and forming a flue through which coolingair may be assed, means for maintaming both of salt walls 111 ahnement and in, spaced relation and permitting relative movement between the two, and means for 'tile therein, "tile wlth the outer wall across such space conducting cooling air through the space be? tween said walls.

:25. In a steam boiler and its setting, a furnace wall not more than ten inches in thickness, an outer lwall'spaced from said furnace wall and forming therewith an air passage, and means comprisingtwo fans for causing air to pass through said passage, the respective fans being located at opposite ends of said passage. 1

26. In a steam boiler and its setting, a furnace wall, an outer wall spaced from said furnace wall to. form an air passage, and

tie-pieces joining said walls to maintain them in spaced relation and constructed and arranged to permit relative motion between the two walls in a. direction parallel to the planes of said walls.

27. In a steam boiler and its setting comprising a stoker, a furnace wall, brick walls on the sides of the furnace and spaced therefrom, and a front wall consisting of a metallic casing spaced from the front furnace. wall, means for holding the furnace walls and the outer walls in alinement and in spaced relation, and means for passing cooling air between the spaced walls.

28. A furnace wall, comprising an inner and an outer wall spaced apart to permit the passage of air through such space, and tie pieces spaced apart and connecting the inner and outer walls across such space and constructed and arranged to permit relative motionbetween the two walls in a direction parallel to the plane of the wall. 7

29. A furnace wall, comprising an inner and an outer wall spaced apart to permit the passage of air through such space, said inner wall having a plurality of courses of and tie pieces connecting said and constructed and arrangedto permit relative motion between the two walls in a direca tionparallel to the plane of the wall.

' 30. A vertically extending furnace wall, compr sing an inner wall and an outer wall spaced apart to permit the passage of air throu 11 such space, and metallic tie pieces space apart and connected to said inner wall and engaging fixed portions of the outer wall, said tie pieces being located in such space and constructed and arranged to permit-relative motion between the two walls in a direction parallel tothe plane of the wall. i

31. A vertically extending furnace wall, comprising an inner wall and an outer wall spaced apart to permit the passa e of air through such space, said inner wall having a plurality of courses of tile therein, and metallic tie pieces connected to said tile and engaging fixed port-ions of the outer wall,

said tie pieces being located in such space and constructed and arranged to permit relatire motion between the two walls in a direction parallel to the plane of the wall.

32. In combination, a furnace provided with a .wall comprising an inner and an outer wall spaced apart, means for passing ail-between said walls for cooling the same and for supplying said'air to furnace for combustion, the inner wall having a plurality of courses of tile therein, and tie pieces connecting said tile with the said outer wall across the space between the two and constructed and arranged to permit relatlve motion between the two walls in a direction parallel to the plane of the wall.

33. An air cooled furnace wall comprising an inner wall and an outer wall spaced from said inner wall. bonding tiles in said wall, metallic members located within the space between said inner and outer walls andengaging said bonding tiles to'maintain said walls in alignment, and means for passing cooling air through the space between said inner and outer walls and over said members.

34:. An air cooled furnace wall comprising an inner wall and an outer wall spaced from said inner wall, bonding tiles in said wall, metallic inemlm-s provided with hooked ends which rest in openings in said bonding tiles and located within the space between said inner and outer walls and engaging said bonding tiles to maintain said walls in alignment, and means for passing cooling air through the space between said inner and outer walls and over said members.

35. An air cooled furnace. wall comprising an inner wall and an outer wall spaced from said inner wall. bonding tiles in said wall, metallic members provided with hooked ends which rest in openings formed in the sides of said bonding tiles and located within the space. between said inner and outer walls and engaging said bonding ti es to maintain said walls in alignment, and means for passing cooling air through the space between said inncrnnd outer walls and over said members.

36. An air cooled furnace wall comprising an inner wall and an outer wall spaced from said inner wall, bonding tiles/in said wall, metallic members provided with hooked ends which pass "downwardly into openings in said bonding tiles and located' within the space between said inner and outer walls and engaging said bonding tiles to maintain said walls in alignment, and

:and over said members.

. K ,and OTi l' Sa-ICL membersmeans for passing cooling air through the .bers.

38. An air cooled furnace wallfcomprising an inner wall and an outer wall spaced from said inner wall, bonding tiles in said wall, metallic members provided with hooked ends which pass downwardly into openings formed in the sides of" two adja-- centbonding tiles and located within the space between said mner and outer walls and engaging said bonding tlles to'main- 'ta in said walls in alignment, and means for passing cooling air through the space between said inner and outer walls anti over said members.

39., An air cooled furnace wall compris ing an inner wall and an outer wall spaced from 'said inner wall, bonding tiles in said wall, metallicmembers provided with hooked ends so arranged that they ma; 'be introduced in place in the bonding tiles when the latter are laid up in the wall and do not project beyond the outer face of the wall 'said, metallic membersbeing' located within the space betweelrsaicl inner and outer walls and engaging said bonding tiles to maintain said walls in alignment, and means for passing cooling air through the space between said inner and outer walls.

40. An air cooled furna wall comprising an inner wall and an outer wall spaced from said inner wall, bonding tiles in said wall, 1netallic members provided with hooked ends, one of the hooked ends of each member passing downwardy into an opening in the bonding tiles and the other end engaging an opening in a part carried by said outer wall, said metallic members being located within the space between 'said inner and outer walls and-engaging said bonding tiles to maintain said walls in alignment, and means for passing cooling air through the space between said inner and outer walls and over said members.

41. An air cooled furnace wall comprising an inner wall and an outer wall spaced from said inner wall, bonding tiles in said wall. metallic members provided with hooked ends, one of the hooked ends of each member passing downwardly into an opening in the bonding tiles and the other end engaging an opening in a part carried by said outer wall, said metallic members being located within the space between said inner and outer walls and engaging said bonding tiles to maintain saidwalls in alignment, and means for passing cooling air through the space between said inner and outer walls and over said members, said bonding tiles projecting into the air space so that the members which serve to keep the furnace wall in alignment come entirely outside of the furnace wall.

42. A furnace wall comprising inner and outer spaced walls, and members for maintainin g said walls in spaced relation, the ends of said members passing inside of the surface of'one of said walls, and the parts being so constructed and. arranged that said members may be placed in position in said wall after the wall is laid up.

l3. In furnace construction an inner wall and an outer wall spaced fromsaid inner .wall, a metallic member for maintaining said inner wall in position and having at least a p'ortiop thereof located within the space between said inner and outer walls, and an inlet and an outlet for the' space between said \\'a1ls..whereb v cooling air ma) be passed through said space and over a portion of said metallic member.

H. In furnace construction, an inner wall and an outer wall spaced from said inner wall, the inner wall being provided with bonding tiles, means comprising metallic members engaging said bonding tiles for maintaining said inner wall in position, and having at least a portion thereof located within the space between said inner and over a portion of said metallic members.

DAVID, s. JilCOBUS.

outer walls and an inlet and an outlet for v the space between said walls whereby cooling air may be passed through said space and

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