US2655238A

US2655238A - Fluid heater casing

Info

Publication number: US2655238A
Application number: US709568A
Authority: US
Inventors: Ivar L Langvand
Original assignee: Babcock and Wilcox Co
Current assignee: Babcock and Wilcox Co
Priority date: 1946-11-13
Filing date: 1946-11-13
Publication date: 1953-10-13
Anticipated expiration: 1970-10-13
Also published as: GB648856A

Description

l. L. LANGVAND FLUID HEATER CASING oct. 13, 1953 4 Sheets-Sheet l Filed Nov. 13, 1946 Nign] y INVENTOR f1/ar .l angl/@17d ATTORNEY OCt- 13, 1953 l. L. LANGVAND A' 2,655,238

FLUID HEATER CASING Filed Nov. 13,'1946 4 yshears-sheet 2 -INVENTOR ATTORNEY l. L. LANGVAND FLUID HEATER CASING Oct. 13, 1953 4 Sheets-Sheet 5 Filed Nov. 13, 1946 INVENTOR z/arcmyI/ana QM. ATTORNEY Oct. 13, 1953 l. L. LANGVAND FLUID HEATER cAsrNG 4 Sheets-Sheet 4 Filed NOV. 13, 1946 INVENTOR ATTORNEY Patented Oct. 13, 1953 FLUID HEATER CASING Ivar L. Langvand, Barberton, Ohio, assignor to The Babcock & Wilcox Company, Rockleigh, N. J., a corporation of New Jersey Application November 13, 1946, Serial No. 709,568

The invention herein disclosed relates to a wall casing construction adapted for application to chambered structures of various types, particularly those in which the casing is to be maintained substantially gas-tight under varying temperature conditions. My invention is therefore especially useful in the construction of walls for fuel fired furnaces, and for fluid heaters in general Whether supplied with heat from an associated fuel-nred furnace or, for example, from hot gases directed therethrough, such apparatus including boilers, superheaters, economizers, air heaters and the like.

An object of my invention is to provide a wall casing of relatively low material cost, utilizing for example panels of relatively thin plates or sheets, and supporting such plates or sheets in a manner facilitating their removal and reassembly when access is to be had to interior portions of the apparatus.

Another object is to construction Awherein panels of commercially available flat metal platesv or sheets may be utilized directly in the assembly without the need of preliminary machining, shaping, or other fabricating operations.

An additional object is to provide means for maintaining the casing substantially gas-tight at varying operating temperatures while permitting adequate expansive and contractive movement of component parts without distortion.

A further object is to utilize the inherent flexibility of thin metal plates or sheets in maintaining a gas-tight seal at their edges, and by the application of forces adjacent an edge of each such plate producing a resilient flexure toV increase plate stiffness.

Other more specic objects include the support of a casing of paneled arrangement on fluid heating tubes; the provision of tube-supported separately expansible casing sections; and the provision of a gas-tight seal between such sections.

The various features of novelty which characterize my invention are pointed out with yparticularity in the claims annexed to and forming a" part of this specification. For a better understanding of the invention, its operating advantages and specic objects attained by itsuse, reference should be had to the accompanying draw- `provide aY paneled casing ings and descriptive matter in which I have illustrated and described a preferred embodiment of A my invention.

4 Claims. (C1. 189-34) generating unit having fluid cooled walls constructed in accordance with my invention;

Fig. 2 is a fragmentary isometric View of the unit in Fig. 1, showing features of the exterior casing; Y

Fig. 3 is a fragmentary enlargement of Fig. 1 showing details of the wall construction adjacent a gas flow passage;

Figs. 4 and 5 are enlarged sections taken along lines 4-4 and 5 5 of Fig. 3;

Fig. 6 is a fragmentary enlargement of Fig. 1 showing details of the Wall construction adjacent the combustion chamber; and,

Fig. 7 is an enlarged plan section taken along line l-'I of Fig. 6 showing wall details adjacent a corner of the setting and along adjoining walls.

As illustrated, the invention is shown in connection with a steam generating unit or boiler of the type disclosed in my copending application Serial No. 653,843, filed March l2, 1946, wherein fuel is burned in a fluid cooled combustion chamber l2 and the resulting hot gases are directed around one end of a partition wall I3 into and through a fluid cooled gas passage I4 in contact with a main bank of boiler tubes I5 having opposite ends connected to upper and lower boiler drums I6 and I'I, the cooled gases being discharged through a suitable gas outlet as described in my aforesaid prior application. A soot hopper I8 having a pluralty of discharge spouts I9 is arranged beneath passage I4 as a receptacle for solids separated from the gases during their flow through the passage.

As further disclosed in said application the boiler setting is generally rectangular in horizon- Atal cross section and comprises fluid cooled front, rear and side walls which, in the unit as herein illustrated, include the iiuid cooled side wall 2l having tubes 2Ia therein and constituting a boundary wall of the combustion chamber or furnace I2, and the fluid cooled side wall 23 having tubes 23a therein and constituting a boundary wall of gas passage I4, the walls 2| and 23'having upper end portions extended toward drum VI6 to form the upper enclosing wall or roof.

The entire weight of the unit is supported on A a frame-like structure disposed below the level of boiler drum I'I, substantially in accordance ,with` the disclosure in the copending application March 14, 1946,"now Patent No. 2,583,599, patented YJanuary 29, 1952,the lower .drum- Il being seated at eachv end in 'asaddle 24 supported "of Glen J. Schoessow, SerialfNo. 654,239, filed Y bination tie-bar and buckstay units 2B and 21 arranged at different elevations; the upper buckstay unit 26 extending completely around the setting and engaging all four walls, and the lower buckstay unit 21 at approximately mud drum 5 level engaging the front, the rear, and one side wall 2| 'and terminatingin ends securedgto Alonger drum l-I;-y the-1in dual lcfuclstayunits or assemblies in adjoining Walls being connected together at the corners of the setting so as to cowlordinate expansion and contraction ojmthemespective walls; and the Walls of combustin chamber l2 being verticallyzsuppdrtedigat; sub:

stantially mud drum levelebyfeol-mns fwhichf., transmit the weight to the supportingnfame '1'5 structure; for example, as ljierkeisn illustratedicr side wall 2l, a column 28,"illistrati've bf "a 'plu'- rality of such columns, being pivotally connected at its upper end to thejlpwer tie-bar and buck- V,ir-igarrseixpans-ign sparge between the adjacent upmight edgesiofgealypair of plates in the row, ad-

ditibnallto thels'pace required for accommodation oteifieqlempnaali 5'1- Eachbattenmember 35 is suitably in the form ofs-:aechannel having its anges 58 symmetrically .stay assembly, 3251r and at its lower end to a side clv ce tion comprising a plurality of separate vp atie ,.2

memberses?.Lharinatheiaasiageet edgar@ 1.04115 n,

iClmRSl :Mill-W??? .mpndseoge bers 34 and 35 in a manner to b W .sgnbedsrertainrqrtiensgpatria, @Sieg being .Y tended outwardly toi a, ho .upperbukayiunit 35 5,11% c i 219W@fbi19kt-ayesnit12l .aad eus Ortig urnas 28. Each of the englo lls` incl s cnc ieriatamaybe finalized? gnejb, v egim-fer rissa C011 n members 4 5 t lich .lap .the edges. 0i each paix @fia A c i er-sheets 31st @bei inner et@ zeahrbetlb'f Sanering its @attain and, upntd 911,3. Clip info' its d5 Wall or roof silien hf? 35-in side wall 23, the casing members 32 in the first or outer row being secured by bolts 69 to collector channel 61.

For the lowerl casing section 3IB the clip angles 52 are connected to the lower side of buckstay 26A in the manner described for the attachment of clip angles 52 to the upper side except with respect to the vertical clearances provided between bolts 54 and the ends of slotted clip angle holes 56, as indicated in Fig. 5, where, in the case of the upper assembly the greater clearance is provided adjacent the lower end of each bolt hole and in the case of the lower assembly is provided adjacent the upper end of each bolt hole. In the lower casing section 3IB, the batten bars 34 are connected at their upper ends to clip angles 52 by welds 53, while at their lower ends are welded or otherwise connected to the relatively stationary external metal plate 12 of soot hopper I8 and fthus maintained in'substantially fixed position.

The gas-tight housing 36 connecting the upper and lower sections 3IA and 3IB, respectively, comprises a transversely continuous wrapper plate 59 in the form of a trough or channel enclosing the upper, lower, and outer sides of buckstay unit 26A, the wrapper pla-te having an integral flange 6I along each of its upper and lower edges in contact with panel plates 32 in the respective adjoining casing sections 3IA and 3IB. The housing fianges 6I are assembled inwardly of casing plates 32 in both sections and thus between the casing plates 32 and batten bars 34 where they are held in sealing contact with plates 32 by the clamping action of batten channels 35. The wrapper plate 59 is suitably formed of relatively thin gauge metal preferably of a thickness less :than the thickness of the main casing plates, for example, of No. 16 gauge as compared with a No. gauge thickness of casing plates 32, thereby providing a degree of flexibility enabling the housing to perform its function as an expansible breather connection between adjacent casing sections without disrupting the integrity of the seal. Although the assembly of flanges 6I between plates 32 and batten bars 34 in each of sections 3IA and 3IB results in a slight separation between the plates and bars, for a limited distance above and below the edges of flanges 6I, the channel members 35 still bear against the outer surfaces of plates 32 throughout their heights and any disadvantageous impairment of the' seal is thereby avoided.

When it is necessary to form the housing or wrapper plate 59 in two or more sections because of the length of buckstay involved, the adjacent edges of each pair of housing plate sections, such as 59a and 59h, are overlapped interiorly by straight bars IIJI at the upper, lower and outer sides, and exteriorly by an angle bar |02 at the upper and outer sides and by a straight bar I03 at the under side, each inner bar IUI being permanently secured to one of the adjacent sections to facilitate assembly, and `the interior and exterior sets of bars being held in clamping position by bolts 104 as indicated. Y 1

In the opposite side wall 2|, the tubes 21a are installed in tube-to-tube relation which reduces the thickness of wall insulation 38 required and thus enables the tie-bar 39 to be mounted directly on wall tubes, as shown, instead of beiner spaced therefrom, as in wall 23 ;v otherwise, the tie-bar and buckstay assembly 26B is essentially a duplication of the corresponding assembly 26A described for side wall 23. The upper casing sec.-

bolts 9 I.

tion3I C for side wall 2| is also, in` all essential respects, a duplication of the corresponding upper casing section 3 IA for side wall 23, including the juncture with roof section ,2IR which at an intermediate position includes an I-beam stiifener member 13 as a substitute for one of the roof batten bars 34. Roof plates 32 are clamped against the upper flange of member 13, by a batten channel 35, in the same manner and with. the same effect as against each batten bar 34r The lower section of casing 3l for side wall 2I comprises an intermediate section 3ID between

buckstay housings

36 and 31, and a bottom section 3IE forming part of the lower housing 31. The intermediate casing section 3ID is supported on clip angles 52 bolted to the upper side of buckstay 21, each batten bar 34 for this section 3ID having a welded connection 53 with a clip angle 52 attached to the upper buckstay 26B and extending downwardly within housing 31 Ito a similar welded connection 53 with its bottom-supporting clip angle 52 which is bolted to buckstay 21. Each suchrbatten bar 34 is secured to a stiiener angle bar 14 by bolts 15, and each bar 14 ybraced from the lowerl buckstay unit 21 by a diagonally positioned bar 16 secured by bolt 18 to stifener bar 14 and to the buckstay web by weld 19. The tie-bar 8I associated with the lower buckstay assembly 21 is mounted directly on wall tubes 2Ia, and wall weight transmitted therefrom through pivoted columns 28 to the foundation structure as hereinbefore mentioned.

The buckstay housing 36, which forms an expansible gas-tight connection between casing sections 3 IC and 3 ID, is a duplicate of the corresponding housing 36 in side wall 23 as` previously described; in wall 2l, the housing wrapper plate 59 having its upper and lower flanges 6I similarly assembled in overlapping relation to the adjacent ends of casing plate members 32 and the flanges l clamped between such plate ends and batten bars 34 in the respective casing sections to form a seal.

The lowermost casing section 3IE` includes inner and

outer batten members

34 and 35 of the same form and arrangement as described for other casing sections. The lower ends of batten bars 34 in section 3IE are maintained stationary by welds, or other suitable form of attachment, to a part of the foundation structure such as side member 29. A horizontal casing section 3IH connecting the upright casing sections 3ID and 3IE includes bars 82 having outer end flanges 33 which are connected by bolts 84 to the upper ends of batten bars 34 associated with the bottom casing section 3IE', -the inner ends of bars 82 being individually secured as by bolts 85 to the corresponding stiifener bars 14 and thus form a rigid assembly with the batten bars 34 of the intermediate casing section Sil).

A collector bar 86 is secured by boltsrll to the flanges 83 of bars 82vand serves as an inner transverse batten member against which the upper ends of casing plates 32 are clamped by a collector channel 89 held Yin clamping position by Horizontally disposed casing plates 32 are supported on bars' 82'withv adjacent edges of each pair of plates'laid over an inner batten bar 32 so as to be overlapped thereby, and eachtwo such edges clamped in position by an outer battenE bar. 92 secured by bolts 93 to bar 82 vand collector channel 39. fr The horizontal'casing plates 32 are yformed along their innereglges with an upstanding iiange 94 which clamped between `the casing plate members,lfhdbattenbars 34 of intermediate section '3413, along rtllieii outer edges with 1a 'depending ilangewhich lis clamped between collector 'bar 87E fand 'collector channel v89 *at the '-juntevvth See'tdllA "MEL Fig. 'Il shows Aa fplainfsection of 'the casing 'arrangmentadjacent a crnei'fof thesettingwhere casing `3| is spaced from-fthe rows of-"sidewall tubes 2l-aand `rear wall tubes 12d to "allowffor the required thicknessof vv' -sulaitionGB-Z End plates 32a in `bo'th Wallsre Joindfby a'weldlf along their meetingfedges, and' "rthe'i fare Welded at S'l' tothe leg'sfofst-ie'nr hgl'e bar-'$35 thereby plfvldn'gv 5a con'r seal Van a'ofding rigidity-t0 the oa'siflgat tHe jntui ltWC Walls- Walls constructed in fa'olane with the described inventionthusincludeanurnberfi desir'- "able faturessuchasvthelprovision fafgasitiglt enclosure r leasing `ivi-rileIa;ll avving lfre'edoinf 'of movement of associated' ciali elements due `to therinaleit-pansir'an` and! contraction' including, -tor example, heat-transfer 'tubes'. bywhich'the casin'g 'is'fsupplirtedi;` provision being alsomadelforirela- -tive ieirpansidnfand *contraction of casing plate members lin.ladjaconti'fpanels, and fforimovement of one casingIsection'relative to another. The panel' construction? of Ic'asingl -is` also advantageous from ari-economical standpoint--in-that commerciallyfavailable "plain imetail'uplates. or sheets' may be utilized directly in 'thefa'ssemblyf'withoutfpreliminary fabrication asA usually required. In the .present construction,"suchioperations as forming, machining andi Weldingare limitedfinainlyto. the fabrication 'of 4panelwall elements byrwhich "the casing plate members:arefsupportedandi held in operative positionithereb'y making itvpossibl'e to 3 construct; thecasing atfreduccd cost Withotisacirificing- :quality of' coristructin: "asi'determirred'` by its continuedfeigasitightnessiand :pleasingl appear- 'ance inservice.

It is. to `beunderstoodlthat in:theafpresentspeei: nc'atin, the term plate memberswaslapplied to elements :ofthe casing., fandizparticularly as used in the claims, is intended to cover members-that are commerciallyknowna's.platesand .she'ets Whilefin accordance with tlie 'provisions ofI the statutesl `have-illustrated and described `iiere'i'n the best Yioin-of'rny invention notrknovn'to me those `slilledin the artj will understandfthat changes maybe made'in'tne 'fornirci theialppa'# ratus disclosed "without departing `from` the spirit of the Vinvention 'coveredl'ymy claims,A 'and -that certain features'o'f myiiiv'eiitionjinay sometimes be used to adv'antagelwithou'tia corresponding use ofoth'er` features.

1. A casing comprisingv separate relatively flexible planarfplatemembersarranged in a row and each having substantially parallel-.opposite free edge portions` arrangedtransversely of. the rovina framework'against which said platefmembers are assembled comprising parallel bari-like 4hatten-members of rigidrectilinear formation en gaging the inner side of saidtplate membersand each overlapping the adjacentiree edgap'ortions of a pair of. said.. plate members. sbstaiitially throughout the veite'nt 'of"`s"alid' portions trans- 'versely ottlie ro`wlattn members ofr'gidrectilinear channelelikefcross "section eachl having iianges extending 'substantially normal tosaid plate members 'and terminating-in 4edges engage 'ing the outer side of' said'platemembers solely-'at locations symmetrical with and oppositel'y disjplaced longitudinally of' said `frow fromithe l'total areal-"engag'l --by foneof'said inn'er sidebatten memters-'sn-liileanssrioluing sans andl 'sai'dloiter side Batten vmembers' inclamping en gagment with said lplate members with sunicient force to effect resilient exurefthereoi' toward the inner sible nof said-casing and thereby vincrease plate member stiffness.

2. lIn 'a LAwall? having lheat insulating material insta-lied vadiacent the outer surface 'of said Wall, a 4vpar-relied casing disposed outwardly adjacent said neat insulating material, said casing-conrprising-'separate panels of substantially planar flexible metal .platesspaced in a vrow and providing .free edge Aportions arrangedA transversely oftheirow, va rigid casing supportingv structure comprising Vav row of spaced battenbars-.disposed in falplane adii'acent the inner sideE of said plates and Seach rover-lapping lthe adjacent :tree: edge portions 'oi apair df fsaidplates substantially throughout. the. lextent of said .portions trans- 'versely of the row,. outer. batten membersfdis'- posed in=a..plane adjacent theV outer side of. said plates and each overlapping adjacent free edge portions-fof vapairy of; said. plates. incommon with onefofzsai'd bars, saidouter batten members each providing a-.pairxof transversely spaced ribs' lat'- erallifr adjoining an intermediate recessed' major Width-portion: of each member, saidribs of -e'ach outer.- batteri' member terminating: irl-edges :bearingagainst adjacentv free edge portions at the outer side rotra pair oi said plates atlocations toppositely displaced. longitudinally of said row froml-the Width of a batteri bar overlapping. the same edge portions-attire inner side,andmeans separately connecting each outerbatten member vtothe corresponding' inner batteri member for exerting aa clamping. force-oi sufficient magnitude inivardlysagainst:each of said outer hatten-members to, cause adjacentplates to be flexed invwardly into resilientcontact with said Wall insu- IatiOnsaidCla-mping force being applied through saidlribedges'against theouterside of said plates in opposed offset relation to the reactive forces 'applied' by each of said batten bars against the inner side of saidplates;

3. In'aiwall vhaving heat insulating material in.- stalledzadjacent the outer sidethereof, .a paneled casing-'disposed .outwardly Aadjacent said heat. insulating material and comprising sheet metal plates oi substantially planar formation spaced apart infa rowvand terminating in said. row in freemarginal edggportions arranged transversely of thelrow, rigidly formed rectilinear inner and outer batten membersrconined respectively to the 'inner :andouter sides of said plates anddisposedr respectively .in rows adjacent said" opposite'sidesrand each of said members overlapping fandengaging adjacent spaced free edge'portions of a pair of said plates, substantially throughout the-extentof said'marginal edge portions trans.- ve'rsely of therow, said outer battenmembers each. bearing.' against said plates at theou-ter side 'solely' at zlocations oppositely displaced longitudinally ofi 'said-.row beyond vthe locations of engagementfby. said battenmembers at theinner side, and meansfor effectingv inward .nexure of said platesiintofresilient contact with said'wall insulation comprisingv tension'. members: extending be.- tweenadjaioent spaced free edge portionsof vsuecessivg plates'and separablyand adjustably-con necting said inner androuter batteri members -in lclampingrelationshipito said plates.

4. In a heating gas chamber enclosure; a 'paneledcasingr comprising substantially4 flatv -resilient yplate members lof rectangular. 'formzarranged a row. and-each :.terminating.inparallel `free vedge.; portions :extending '.tinnsverselyfofrtiie row, a stationary support for said casing comprising elongate rectilinear support members arranged in pairs parallel to said edge portions, with the members of each pair disposed along opposite sides of said plate members and each overlapping and engaging adjacent edge portions of a pair of said plate members at a different one of said sides, one member of each pair being of rigid channel-like formation and providing spaced iiange portions extending substantially normal to adjacent plate members at the outer side thereof, the other member of each pair being of rigid bar-like formation and overlapping adjacent plate members at the inner side thereof throughout a width less than the distance between said ange portions at said outer side, and means for maintaining each pair of said support members in engagement with a pair of said plate members with suicient force to effect flexure of said plate members toward the chamber side of said casing.

IVAR L. LANGVAND.

References Cited in the le of this patent UNITED STATES PATENTS Number 5 742,873 866,481 880,020 1,709,088 1,929,444

20 Number Name Date Jamieson Nov. 3, 1903 Kiesel Sept. 17, 1907 Grass Feb, 25, 1908 Murray Apr. 16, 1929 Murray et al. Oct. 10, 1933 Lindsay Oct. 15, 1935 Reintjes Oct. 5, 1937 Smith Nov. 23, 1937 Rutten et al Mar. 21, 1939 Murray, Jr Aug. 1, 1939 Kuhner Sept. 12, 1939 Kunz et al Nov. 26, 1940 MacKechnie Apr. 22, 1941 FOREIGN PATENTS Country Date Norway of 1934