US1849106A - Stoker construction - Google Patents

Description

Filed April 4, 1931 2 Sheets-Sheet ATTORNEY mvENToR Cnnzxes E MxLLaE..

March 15,'1932. c. F. MILLER sToKER CONSTRUCTION Filed April 4, 1931 ZSheets-Sheet WITN ESSES:

v INVENTOR CHARLES F. Muere ATTORNEY y oHAnLns r; MILLER, or ivroortus,v PENNSYLVANIA, iissrdioittroWrisrnirerrrousufannoerablyy supported bythe upper edges of such Patented Mar; i y Y mitica MANUFACTURING. C QMPANY, A ooRreoRrATIoN-or rnNNsYLvANIA, f 1

STOKER ooivsrnucrionl" y *"'Appllicetion imaginaire, 193'1'3 serial` 1%.1527326;

` `My invention relatestopifogressivefeed -k "stokers of the multiple retort'underfeedztylpe-l and it has oran objectto .provideimproved meansfor supporting theretorts and tuyere's.

" 5 VIny accordancefwith'myinventioin Iprovideretorts including sectionalized side walls together witlirbottom walls fmade upatieast in part byfseeondary ramstructures@v The p V lan'df arrangement ofj'thel retorts and tuy're rows, certain parts being omittedffrom `port' er' toillustrate' more' clearly tuyres covering the tuy're spaces between 4the side wallsA and adjacent retortsfareprefadjacent side walls.'4 inventionjrrelatesto :improvedbe'am or girder members for .positioningv and supporting`v the retorts .and .the

tu'yeres,. the `beams positioning; and support-- ing the .retort side walls so as to define-alter# 'nateretort'fand tuyre. spaces andthe retort side walls supporting' the tuyres-at their.up per edges. My improved beam structure .cc'un-V prises a plurality .of 'abutting cast v sections, eachi'section being of trame-like formation and having` an upper `icompression member .anda lowertension member spaced-'apart by 'strutmem'ber or members. Adj acent-sections aresecured 'together by'- bolts including ten'- f Sion bolts located near the lower tension memf `bersiof the abutting sections. In' thisgway,vv

1a built-upcastfbeamstructure may be i pro- -vided otadequate strength `and gone *whichV does not require the 'use ofkinterme'diate sup-v ports. Not only is the strength. of `the beam Vprovided'toraby the most,advantageousfloca- -tion ofthe materi'alicomposing it,.'.tl'1atis, inV Y spaced-apart tension and .compression meinbersj:butl the compression members may'v vbe made relatively thin and' `ot littleV depth,

V.whereby the Vingress oi .air into the' tuyre spaces is facilitated throughout the llength -osuohspaces andthe open spacesbe'tween si',

the tension and the compression members provide for ready distributionandcircula-V :tion of'air throughout the space'underneath ythe-structure and directly .underneathfthe' .compression 'members oi'. the 4girderbeain structures Amorel specific object of my'in# Yvention. is to provide a vstructure having these l permit longitudinal expansion of the stoker. rllnestoker is of afabricatedconstruction l.and comprises-.fa plurality'otfspaced parallel .advantageous features of construction' and operation. Y These andother objects .are eileoted vby my invention, v as will be apparent from the fol- ;tionsof the Vstok lowing' description vand claim takenk in con.-

nection with the accompanying-drawings,

formingja part of this application, inlwhich:

Y *Figb-lis a longitudinal sectional `yview Uhrolllgh a letortfo'f "a Stoker constructed in i accordance with the presentV invention Fig. 2 Ais anenlarged plan viewiot thestoker y shown in Fig. l, illustrating the construction the detail structure; andi? i Fig. 'f8 `isfa fragmentary transversesection f takenl on the''line: III-1110i? F ig."l.1ff ff f 'Referring more in "detail tolfthe" construc-` tion illustrated, thereferencenumeral l0 in-` dicates, inV its entirety, a stoker constructed in n accordano'eA ,with 1 the;V present `'invention. The stoker 'comprisesfin generalypara-llel alternately-arranged retorts 11 and rowsof Vtuyres 12.` 1 C'oalislted' from'a hopper 13f'an'd into the'end's ott-he retorts byipriniary-ra'ms dlll vreeipro'cating- Within ram'boXes l5'.` The Coalis'adva'nced along the retorts` andfor'ced upwardly and;` laterallyo'nto the tuyeresi'by secondary" 'ra-ms; 16- ,reeiprocating longitudilf -nally of 'the vrptortsi "Air for combustion' is supplied from.A beneathftliesstoker and iows iorizontally 'through openings `provided in the tuyres andinto the: fuel bed. The Vresulting ash'is movedfdownt-he Stoker Vby* Avirtue of its frictional Contact with thedown- `wardly moving tuelbed and'isV discharged Vfrom-the lower end by'conventionalv means,

not'shownpW i The stoker is supported at' the front by "a supporting construetion- 20F comprising `a Atransverse girder 21 anda-series of castings 221disposed in'abutting sideeby-'side vrelation 'along the upper face of the gi-rder; VYThe castlings 22Yare `bolted to the gird'er 21.1' The nStoker is f supported at itsk lower lend v by Qa supporting;V construction 23 vcomprisingz a girybythe .upper 'acei'of the-girder 24' so fas to beams '26' secured by bolts 27`and2'8 at vtheir "der 24 and castingsQ disposedin abutting y side-byfsiderelation and slidably supported lfree the retorts are provided by the secondary rams 16 and by detachably-mounted bottom or guide plates 31 supporting the secondary rams. The plates 31 are supported 1n position by brackets`32 which rest on upper lateral flanges 33 of adjacent beams and are bolted to the Side plates 29. The tuyeres 12 are disposed in overlapping stepped relation and bridge the distance between and are supported by the adjacent Vside Vwalls of adjacent retort-s. 1 f It will thus be seen that the beams 26 which `perform the load carrying function of the Stoker, are separated from the burningl fuel by the sectionalized more refractory metal parts of the Stoker, and are maintained in a cool condition .by virtue of this contact with the air beneath the stoker. Furthermore, the beams-are an inherent part of the retort structure and serve as a positioning means for the retort side walls, vthereby determining the width of the air spaces between retorts.` Each beam is a frame-like construction and maybe divided functionally speaking into a compression member whichy extends along theretort sidewall-and to which the side plates 29 are bolted, a tension member 41 connected at itsends to the member 40, and strut members 42 and 43 spacing or holding apart the compression member andthe tension member. Structurally speaking the beam comprises three integrally-cast Vframelike sections 45, `46, and 47 The section 45 is secured by the bolts 27 to the casting 22 and comprises acompression section 40a, a tension section'41d and a strut'section 42a. The section 46 comprises a compression section 406, a tension section-41?) and strut section 42?; and 436. The strut section 426 abuts the strut section 42a and is Vrigidly secured thereto by bolts`48 and 49, the bolts 49 transmitting the tension stressesbetween the sections 41a and 416 thereby making them functionally' speaking one member. The section 47 comprises a compression section 400, a tension section 410, and a strut section 430, the latter section abutting the section 43?) and rigidly. secured thereto by bolts 56 and 51, the bolts 51 serving to transmit the tension stresses between the sections 415 and 410 making these two functionally one. The lower end of 'the section 47 is rigidly secured by the bolts 28 to the casting 25.

It will thus be seen that I have provided an extremely strong and light beam-for support-ing and positioningthe remaining parts of the Stoker. The type of construction permits :the use ofrelatively cheap material. Furthermore7 due to the sectionalized feature, its length may be readily varied to suitdifferent length stokers by omitting the intermediate section, by varying the size of either of the sections, or by providing two ormore intermediate sections. Also, as the beam is of frame-like design, a minimum amount of-structure appears below the Stoker intheair chamber, and thereby reducing to a minimum the likelihood of Veddy currents in the air supply which if excessive cause unplate-like beams are not sufficiently strong to carry lthe Stoker load if excessive spans between front and rear supports are involved. Therefore, I provide a girder type of beam which does not function as a retort side wall but serves only as a beam to carry load, the elementsconstituting the retort side walls being supported and positioned by the girder beams. Therefore, having relieved the cast beams of the duty of themselves providing retort'side walls, it becomes possible to use the girder construction of the type herein disclosed wherein the extreme compression and tension-fibers are located at such distances from the neutral axis as to provide avery strong structure for the amount of material used. As most of the material constituting Athe girder isembodied in thejcompression and tension portions and as such portions are located desired distances fromV the neutral axes as just pointed out, it will be apparent that-the construction is very strong for the weight of material used and that it is therefore possible to provide a supporting girder which can be made relatively much longer than the'type of cast iron retort side wall beam heretofore used.

' While I have shown my invention in but one form, it will be obvious to those skilled in the art that itis not so limited, but is susceptible of various changes and modifications Vwithout departing from the spirit thereof,

and desire'` therefore, that only such limitationsshall be placed thereupon as are imposed by the prior art or as are specifically setforth in the appended claim.

What I claim is In a furnace, the combination of spaced supporting structures, parallel, alternatelyarranged retorts and rows of tuyres providing an inclined multiple retort underfeed Stoker extending between and carried by the supporting structures and comprising a pluralitv of pairs of longitudinally-extending, parallel beam members carried by the supporting structures, the beam members of eac-h pair beingspaced apart so ast position the 'y retort side kWalls to define. alternately-ar-` A ranged retortvand tuyre spaces, each beam member comprising a plurality of abutting cast sections and each section including up v per compression Vand klower tension members spaced apart by compresslonstrut means,

and bolts for securing yabutting sections togather including tension bolts located ad-lV f jacent the lower Ytension members'of'abutting sections. Y

In testimony whereof,A I have hereunto sub d scribed my name this 2nd day of April 1931.

y CHARLES F. MILLER.

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