US1986951A - Slagging furnace installation - Google Patents

Description

Jan. V 8, 1935. w. J. VOGEL SLAGGING FURNACE INSTALLATION 2, 1931 4 Sheets-Sheet 1 Jan. 8, 1935. w. J. VOGL SLAGGING FURNACE INSTALLATION Filed May 22, 1931 4 Sheets-Sheet 2 ATTORNEY$ Jan. 8, 1935. w. Jv. VOGEL 1,986,951

SLAGG I NG FURNAC E I NSTALLATI ON Filed May 22. 1931 4 Sheets-Sheet 3 y lNvEryoR BY j l ATTORNEY;

ration, `New Delaware s mvenuii relates impfve Vmeinfur; nace installationsV has particular `reference f to furnaces adaptedt be?epemtedfwiurabedfcr by high temperatures.-A 'TT nace A having a slag retaining bottom B,`i. e.,j

Vportion of the furnace', the @righ Slag maintained @einen een or bottom for such furnaces,"

Another object` H for sla'ggi'ng"` furnaces hav tively protectingfce'itain' isltheprrowjsioii f spetter ,Morehsp'ecically' it'is anjfbiect of `myin1'/`en. tion 'to effectivelycool the 4lovver pclirtion"` floor byf absorbingjth Yheat which is con through the.floor. '7. Y.

l also contemplate returning the heat sorbed finto the c.imbustio`chaml'aer` f furnace, either directly'` or throughfaf'milling` or pulverizing `system` associated `withfthe furnace.

A further object resides in providingv metal# lic backedV floor foryslagging `f uliiace's having protective meansv associated th revv'ith.v

How the foregoingflother vvitlifsuchv `citlier objects and advantages vasnria Iherei'nafterap pear, or are incidentto my invention,arefrealized is illustrated the vpreferred form 'in'tl'e acc panyingdrawings,Whereinmm 1',

Fig. lis a sectional elevationfof a` urnace i stallation `embodying myfinventio i Fig. 2 is a 7fragmentaryvievv which is in section as taken'on i Zin Fig. 1, andthe left hand'half of which is elelafml 2 Y Figs. 3, 4 and 5 arel enlarged fragmentary cross `sections through the licor showing modifications in the iloor construction. Y Fig. 6 illustrates amilling or pulverizing and burner` arrangement of the direct ring. type in association with the furnace, the milling system being `shown in elevation and a portion of the furnace being shown in section. 1.

Fig. y7 illustrates a milling system associated with the furnace in a modified arrangement. Fig. 8 illustrates an` arrangement adapted `to withdraw heated Vair from the bottom of the furnace and to return the heated air directly into the combustion chamber of the furnace.

Referring now more particularly to' Figs. 1l and 2, the installation comprises, in general, a fur-` a bottom adapted to maintain abcd of`molten slag, burner means C for introducing nely divided'fuel, such as pulverized coal, and air intothe combustion chamber at points adjacent the slag ofthe the l upper 1sor air thus drawn through aangaf 1 f chamber "of the furnace.' 1 i i lgThegcombustion `clnamberlci' the furnace aslits upright Walls'lined with steam evaporatsuitablejeowncomrs. `1o,` 10g. and 10b.` and mwer headersl"vf1, 1`1a and 11b communicablyconnectl jingg `tubes 9 "whichireceiiie water by "means [of iidfand Boiler.Diocatuabbvthe combustion lalherows of wall are.` backedby suitprisesfa layer `of refractory material I5 having t'erial,"` which lining cupped tomantain a substantal.bed of molten lSh'tgls indicated at. 17,. {I'hegbottomsurfaceof thegrefractory layer 15 floor aslavzholei'ssupported byemeans of structuralbe'ains such as the I- beams 19 and 20. l The 4molten slagmay be'tappedffromlthe slagl retaining.. bottom .by means of a suitable tap'openng or spout 21.

A *Teef [of V a l multiplicity of metallic cooling tubes` `23,

which tubesin `this instance rest the metallic backing 18.` The, recess 22 2'4 and 25 are'providedradjacent the of the chamber 24 and leaves the tubes at their ends which are open to the chamber 25, suitablemeans being provided to cause circulation of the `air as `will nowv appear.

-Referring now more particularly toFig. 6, it

will be seen that the chamber 25 communicates' with a duct 28 leading from the outlet opening 2'?` to the inlet portion 29 of a pulverizing mill 30` Which is incorporated in a milling system 31 associated with the furnace. Thus air is drawn 4through the tubes 23 by means of the suction at the inlet side of the milling system. The suction is produced by a fan integral with the mill, as is usual with the unit type of mill disclosed. The

dolomitev or similar ina-` \Ss 22 `:is provided in! the lower face of .thefrefactory bottoml for theaccommodation 1S (0f .greater lehgth than the length ofthe tubesv23's`o that chambers theiubes 23 absorbs the f heat conducted through the slagging floor of` the furnace and through the walls of the tubes,

20 is backed by a, metallic plateorplates-'IB and the thereby cooling the lower portion of and maintaining the metallic backing of the floor ltem 35," which `system age bin 36, the coal free air frpnrthqicyolllep: arator being returned to the mill through the the floor at a temperature much below that which might cause damage. The heated air passes through the milling system 31 and ultimately is introduced back into the furnace A with pulverized fuel by "rlxieansolthioigiuit Bz'iagrld bu'rrilei' means C and thus-effects ving in-heat. In Fig.- 7 heated air is withdrawn from the furtrated in which air passages 23C for the cooling air are formed directly in the lower face of the refractory layer 15 of the floor B. These passages may be .formed of hollow refractory tiles ducts for the struction, vi. e.,

. or by laying refractory brick in a manner to form assage of air. Ihe metal conthe form inwhich I employ rnetallicy tubes, ispreferable, however, forthe reason that the air passages are nace bottom by means of a conduit 33 leadingflfstruction. This to a low pressure point 34 in .thepulverizings delivers "o'al to 'arstorage bin 36 in a well known manheby..deli\ering the coal and air mixture fromif hen'illby-'neansf ofthe fan 35a to a cyclonefsep'aratornot shown) from which the separated coal passes to the storreturn line 39. An amount of airis withdrawn-. its@ the. .systemgrrenondna to.` the amount of lltd'aivntrodub atfS r arld' 7 the Fig mit@ al.

W gangbare@ Qt Y, to" control" the `-:ad

a alternativ .Y the vpossibility o vmaintained free of obmetal construction also obviates f drawing furnace gases or slag *through any crevices or openings which may form inthe furnace floor into the air passages.

:1.:The number and size of the cooling tubes or sages -is l such that air in sufficient quantity for absorbing the'heat conducted through the ,fioor isjcirculatedthrough the tubes or passages.

ce adapted to be operated with Y y cooling ducts vin said bottom at its lower face, A return v'lna 39f `o`f chambers `in said bottom located at the ends of ,said ducts and communicating therewith, an air inlet to the chamber at one end of the ducts, an air outlet fromthe' chamber at the other end of the ducts, said nletand outlet being in the lower face of said bottom,

structurev for sai and open work supporting d bottom.

2. In a furnace adapted tobe operated with 'ag'bedf of slag maintai edin hdrawn stagnant condition,

retaining'bottom for itslower portion in the combination of a slag the furnace having a multiplicity of closely spaced metallic tubes extending thereac'ross, means In a furna Y amber a bed vof" slag mai dampe'rflmay be provided in ,stagnantfc'onditiom the combination of a slag 'mission'of 'retainingjbottom lural'ity portion constructedof refractory, extnding'facross saidrefractory, spaced supporting beams for passing a cooling medium in i islcon-- through ,said tubes, and open work supporting into'the'combusfstructure for Vsaid bottom including a plurality .at45.".'Ihroiigh 'of spaced beams arranged so that said metallic tubes SDM themfor the furnace having its lower metallic tubes `the majorportion of the lower said metallic tubes and beams being arranged so that the tubes span said beams I ,y

'andproyidej'with the beams supporting means ffbr the bottom,

n y y andmeans for passing a cooling tween the metallic mediumthrough'said tubes.

WILLIAM J. VOGEL;

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