US2870624A

US2870624A - Furnace wall

Info

Publication number: US2870624A
Application number: US513399A
Authority: US
Inventors: Richard E Sampson
Original assignee: BIGELOW LIPTAK CORP
Current assignee: BIGELOW LIPTAK CORP
Priority date: 1955-06-06
Filing date: 1955-06-06
Publication date: 1959-01-27
Anticipated expiration: 1976-01-27

Description

Jan. 27,` 1959 R. E. sAMPsoN l 2,870,624

FURNACE Filed June 6, 1955 2 sheets-sheet 1 y IN VEN TOR.

Ffa/47275 dmfsaw Jan. 27, 1959 R. E.|sAMPsoN 2,870,624

` FURNACE l Filed June- 6, 1955 2 Sheets-Sheet 2 FLE.

l M1 v j i i /df nited States Patent FURNACE WALL Application June 6, 1955, Serial No. 513,399

7 Claims. (Cl. 72-101) My linvention relates to Wall structures for industrial furnaces and, in particular, concerns improvements in unit suspended walls that are supported upon a plurality of vertically spaced, horizontally disposed bars.

It is the object of my invention to reduce the overall cost of wall structures for industrial furnaces by reducing the amount of high temperature alloy metal which must be used in the wall structure.

In carrying out my invention, I employ horizontal support bars that are preferably relatively inexpensive gray iron castings. These are located in vertically spaced position on conventional vertical columns in the furnace foundation. They support and carry a series of detachable high temperature alloy hangers which in turn support the refractory tile that are exposed to high temperatures within the furnace. The space between the back of the refractorytile and the horizontal support bars is insulated and I make use of the support bars and the detachable hangers to hold the insulation in proper position.

In the accompanying drawings I have shown for purposes of illustration preferred forms of my invention wherein: L

Figure 1 is a vertical section through a portion of a wall embodying my invention;

Fig. 2 is a horizontal section through a portion of lthe wall of Fig. 1;

Figs. 3, 4 and 5 are detail views of the alloy hanger used in practicing my invention;

Fig. 6 is a vertical section through a slightly modified form of wall construction embodying the invention;

Fig. 7 is a horizontal section through the wall of Fig. 6; and

Figs. 8 and 9 are detail views of the hanger used in the wall of Fig. 6.

The invention is particularly useful in connection with relatively thin industrial furnace walls particularly when they Vmust be airtight, with low heat loss, easy to maintain, and somewhat flexible. Such a wall is illustrated in Figs. 1-6, one specific embodiment of this wall containing refractory tile to a thickness of 41/2 inches and` insula-l tion to a depth of an additional 3 inches.

The wall structure 1 is supported upon vertical columns 3 which are ordinarily I-beams located appropriate dis tances horizontally from each other and mounted in the furnace foundationin aconventional manner. On the inner faces of the columns 3, I bolt a series of horizontal support bars 5 which are spaced predetermined distances above .each other as dictated by theheight of the tile blocks that are used. The support bars 5 are more or less channel shaped having a back web 7 that is slotted to receive bolts 9 that clamp the support bar securely to the columns 3, the slots reducing the weight of the bars and permitting some horizontal adjustment of them. The bars 5 are of identical cross section throughout their length (apart from the' aforementioned slots) and have upper and lower horizontal shelves 11 and 13, respectively, which are turned in toward each other to provide vertical lips or anges 15 and `17, respectively, at the top and the bottomof the bar.A These anges definel an open# ing 19 in the front of the bar, which extends for .the full length of the'bar and, preferably, forV the full width of the wall'since the bars can be placed in horizontal alignment. The bottom shelf 13contains an internal groove 21 while the upper shelf 11 is disposed a substantial distance above the topvof opening 19 due to the length rvof the lip 17. The bars 5 are cast from gray iron and are thus relatively inexpensive though strong and durable at relatively low temperatures, my work indicating that about 900 F. is safe maximum temperature for this material.

Supported in cantilever fashion byA each support bar 5 is a series of cast high temperature alloy tile supporting hangers23, the `precise design of which may vary within the scope of this invention. The vrear portion of the hangers'23 in Figs. 1 6 hasupper and

lower anges

25 and 27, respectively, which engage behind the upper and lower lips 15 and 17 of the bar and which may be ared out at the sides as shown at 27 to improve their sta# bility. vThe neck 29 adjacent the anges is'small enough and the `opening 19 is large enough so 'that the hanger 23 can be inserted in the opening. `After such insertion the lower flange 27 is Seated inthe groove 21. This is preferably a'rather close t so that the bottom flange can apply 'loads'in either horizontal direction toI the support bar A5 without much free movement. The top flange of the hanger 23, of course, applies a load onlyl in an inward (toward the right in Fig. 1) direction to the hanger bar. Theinner end ofthe alloy hanger 23y has upper and

lower flanges

33 and 35, respectively, the upperof which is ared outras seen at 33. These are connected to the

outer flanges

25 and 27 by a more or less triangularly shaped body 37 which in cross section may be I-shaped, the web being open as shown at 39 to reduce weight.

The hangers 23 support the main vrefractory tile blocks 41 'and' with the type shown there is preferably one such hanger for each tile, though the hangers could be designed to carry two or more tile blocks. .It is clear that the hangers 23 are freely shiftable lengthwise of the bars 5 and can. be located in any desired horizontal position, though after insertion the opening in the channel 5 may be stuffed with loose insulation (e. g. asbestos) to hold them in place. In erecting the wall they are preferably, though not necessarily, located approximately on the midplane (below the center of gravity) of the individual tile blocks 41 that they support. The tile blocks 41 are horizontally grooved on the top and on the bottom as shown at 45 and 47, respectively. This provides inwardly facing shoulders 49 and51 at the top and the bottom, respectively, and outwardly facing

shoulders

53 and 55 at the top and bottom, respectively. f

Adjacent to but outwardly of the tile blocks 41, isfa4 layer of relatively soft block insulation 59. The inner l faces of the lips 15 and 17 on the'hanger bars 5 serve to locate this insulation and the blocks thereof are suitably notched out or aperturedso that the hangers 23 pass through them. The blocks are of such thickness (or rather the hangers 23 are of such length) as to be spaced' inwardly of the louter'faces' of the

hanger anges

33 and 35 by la distance corresponding to the width of the projecting portions 63 and 65 of the tile blocks between the

shoulders

49 and 51 at the top and bottomI thereof. Thus, each tile block 41 may be placed on a hanger 23 on one horizontal level so that it rests on the top surface of the flange 33 with the portion 65 caught between the ange and the block insulation 59. The top 63 of the tile block is caught behind the lower flange 35 of the hanger 23 o-n the next horizontal level above. Adjacent tile will, of course, furnish a certain amount of lateral support and as shown in Fig. 2 the tile may be dovetailed or provided with keys and keyways as seen at 67.

i `being spaced horizontally fromheach other by substantial Betweenfthe adjacenfhorizontal'layers ftile '41 'are' placed filler tile 71 which are notched out on their inner corners as shown at 73 to .provide inwardlyV facing? shoulderfs 75v` 'that will engage.' `behind the 'outwardly facing Shoulders 53 and'SS ffthe. 'tilelll Vltohaldj "thefller 'file blocks-.71 in placef The joints 77 betweenfthetile blQQkS 4,1.; andll may befflled withfreclay,or-suitable mortar asfmay the iint between; thel back. f. 'thel 1.ler;'ti1e`7,l andthe ,facet of the, hanger`23Y as` indicatedfatf79`.

`An,outer` layer 8l ofplastic insulatingl cement .may ,be ttowe'led onftherouter'faces ofthe insulating' blo'clssSS'. It` will benotedA that Ythev hanger -b ars" have upper and lower" inwardly facing' anges., on lshoulders ..83 Which, will serve to hold` the. Outer 1ayer"81 in, nlace after ithas hardened.

. ltwill. be geen. that thsonstrution. issuhfthat the gray.' iron Support bars cani be ,inA a` low enou'ghftem.- perature4 zonef (preferably below 900 E.) forgtheirA safe usage. Furthermore, the outer-'faceo'f the w'eb`f7 ofthe hanger-*bars 5 is `exposed to air owbetweenlthe columns 3 whichterids to .keep -the bars l5` cool.

Inferecting this wall, the horizontal bars 5 may be bolted at appropriate vertical'levels to lthe columns 3 after which the'hangers23 may` be put inl position on the hanger bars. After this the' block insulation' l59. may bez-put .in placeagainst the innerfaces Ofthehauger' .bars

"distances, a' layer 'of' insulation "supported -againsrthe inner faces of said bars and passing said hangers but terminating short of the inner ends of the hangers, said hangers having vertical flanges at the inner ends, and refractory tile blocks considerably wider than said hangers each resting at their..bottom ends near the outer faces thereof on ahangeron onebar and at the top end having a shoulder'cau'ghtbehind said vertical ange on a,hangen:on thenextl'vertieally adjacent bar,- the onter; facesvofv said tile.blocks beingin juxtaposition.to...`the inner face-of .said'winsulationtand holdingity against-.said bars, the. inner ends of said hangers being spaced a considerable distance outwardly from the inner faces of said tile blocks, :said-layer: of= insulation. and said refractory blocks being thick enough to provide a temperature gradient through the wall such that said bars are `subiected tov temperatures vno higher uthan suhstannally 9907""1??` v1 2, 'The invention set forth inv claim' 1 wherein saidvhorizo-ntal barsjhave top and bottom vertical 'lipsfdeliningvsaid hanger receiving openingand said hangersihave; top iand bottom vliangesA engaged: behind said lips.

5, l Then the tile' blocks 41 may be mounted on the y hangers 2 3 and they. will serve to hold theA blockYA insular tion. iuplace.. 'The ller ti1es`71-areput in. placeconcurrently with the suspension` of the blocks 41;. After thishasbeenrdone the plasticinsulating. cementl 81 may be troweled inl place. l

The "form of Vthe.. invention showu.iniF,igs., ,6-1-0 'is si v rin most respects Lto, that which hasv just been "der n scri A, d and the same reference numerals areV usedwhere appropriat, In this modification, there are different types of.; tile blocks,thesparticular-formshownbeing a type' thaty is` 7 inches thick), and consequently av diierent tra@ ofgallsyhauger is usedk to suspend the tileblocks. The inner ends'101 of the Vhangers 1 03` are substantially kthe same as those in the previous embodiment. VMThey '3. Theinvention set forth in claim ZJWhereinthe" bot: tom'horizontal portions of' the barsv are provided with a groove and the bottom ange on said hangers A,fits in said groove.

4. Theinvention s etforth lin vclairnl whereinj'the i outer faeeof each'of said bars is providedwith inwardly facingV vertical lflanges deiining inwardly presentingfshonl? ders" andyin'cluding a layer kof insulating cement, between the' outer face' of' saidl insulation andf the' outer facefof s aidtbars so that said bar 'shoulders arev embedded in said layer andfhold -it in place.

5.,"The I'invention set `forth in claim 1Whereinsaid hangers haveupper andflower vertical"angesand'said Y tile v"blocks have upper and lower inwardly presenting shoulders caught behind said hanger flanges.

havea horizontal body portion,extending'inwardly to a f downwardly extending ange105 that engagesb'ehind the shoulder107 provided inthe notched out top `side ofjthey tile blo'cle109. T he'top surface 111 of. ythehanger ,103,servesas a seat for thev bottom ,surfacellIS ofthe tile block andmay also engage an outwardly facing shoulder on'thetile block as shown at`117. Filler tile 1 19't; in the peningsprovidedby theend shapes of the: main 'tile blocks`109 ascan be clearly seen in-'Figs 6.A

' Modifications in the precise structure shown may, of gnirse, be made without departingjfrom the.k spirit and scopeV ofthe invention.

l1;v claim;

1. 'In a suspended wall struetureyfor industrial furnaces including vertical columns, aA plurality ofv vertically spaced channelshaped cast iron horizontal bars havingv their v back faces se'curedto .said columns on different levels, means whereby aspairv ofvertically adjacent bars support refractory tile .blocks forming an inside high temperature lining' f ory the wall structure comprising an inwardly presenting opening extending alo-ng the' lengthof eachof said .bars andincluding a vertical lip, a pluralityfoffinwaldlyv extending relatively narrow' high temperature alloy'hangers .detachably-received in said'bar openings andjeachjhaving an upwardly extending iiangeengaging behind` said Lip ,0,11` said bars,` the hangrSfOn-.sachbar 6 The invention set forth :in claim 1 whereinjsaid hangers'have'downwardly extending ilanges engaged'hef hind upper shoulders on said tile blocks and `have horizontal surfaces located' above. saidflanges on whichgthe bottoms o f the tile blocks'are4` supported.`

'"7."The""invention' set forth in claim 1' Whereinysaid horizontalbars have inwardly presenting upperV andlower shoulders andthe bottoms ofsaidtbars are provided'with horizontally extending grooves, therebeingalayversof insulatingV cementbetween' said insulation and the outer faces of'said barssecured. in place by said. inwardly presentingshoulders, said` hangers also having .downwardly extending flanges fitted. in` said groovesfthere being one ofY said hangers for'each ofv saidj ti1e'b1oel s and saidtile blocks beingv supported at the Ibottom by a hanger onone level and at the top by a hanger on the nexty upper level.

"References Cited in the file of this patent ,UNITED STATESI PATENTS