US919189A - Furnace. - Google Patents

Description

L. L. KNOX.

FURNACE.

APPLIUATIONIILED SEPT. 9,1908. 9 1 9,1 89, 2 Patented Apr. 20, 1909.

3 SHEETS-SHEET 1} l la WITNESSES I INVENTOR 56. Mum,

L. L. KNOX.

FURNACE.

APPLIOATION FILED SEPT. 9, 1908.

Patented Apr; 20, 1909.

3 SHEETS-SHEET 2.

INVENTOR WITNESSES NA u-@ L. KNOX.

FURNACE.

APPLICATION FILED SEPT. 9, 190B.

Patented Apr. 20, 1909.

3 SHEETS-SHEET 3= INVENTOR WITNESSES UN TEn-sTAtrns on rron Lu'r'nne L. KNOX, or BEN avoN, PENNSYLYANIA,'ASSIGNOR TO KEYSTONE FURNACE CONSTRUCTION COMPANY, or rrr'rsnunc, PENNSYLVANIA, A CORPORATION OF Y PENNSYLVANIA.

To all whom it may concern: J

Be it known that I, LUTHER/L. Knox, of Ben Avon, Allegheny county, Pennsylvania, have invented a new and useful Improve ment in Furnaces, of which the following is a full, clear, and exact description, referenceparticularly to furnaces of the regenerative reversing type, being applicable to. various kinds of furnaces in this general class, such as open hearth furnaces, melting furnaces, heating furnaces, etc; and is'desighed to provide of si ple and effective ,characterfor protecting the furnace walls, or such'portions thereof as may beiderirable, from the moreor less rapid destruction which-ordinarily takes placeinfurnaces of this'elass.

The precise nature of the present invention will be bestjunderstood by reference to the accompanying drawings, in which I have shown one embodimentthereof applied to a regenerative reversing furnace o ,the open hearth type, which will now be described, it being premised, however, that my invention as above stated isnot limited to this particular'kind of furnace, and that various changes may be made in the details of construction and arrangement without departing from thespirit and sco. e of my invention as defined in the a pen'de claims.

Re errin to the accompanying drawings,

the numera 2 designates the side walls of the furnace, which are in general of the usual construction. I

3 designates the roof of the furnace, 4 the I gas uptake, 5 the gas'port connecting the up-ta 4 of the furnace chamber, 6 theair port, 7 the arch separating the gas and-air ports, 8 the gas slag ocket, and 9 the air slag pocket, connected y the air lip-takes 10 with the air port 6.

ll designates aportion of the furnafe hearth.

' In accordance with my invention, I pro=- Specification of Letters Patent. Application filed September 9, 1908. Serial No. 452,171.

summon Patented April 20, 1909.

in the manner shown inFig; 2, these boxes extending vertically of the side walls and preferably from about the hearth level to the upper end of the side walls or to. the bot-. .tom ofthe skewback channels 13 which su port the roof. These boxes extend entire y through the thickness of the side wall so that their inner ends form a portion of the inner surface of the furnace walls, and are prefer-f ably'removably seated in the refractory material of the side Walls, so that any one. of them can be readily removed and'replaced. when necessary. These boxes are preferably of thin ornarrow form so as to present relatively small area to the interior of the fur- I nace, and thereby prevent undue chilling or cooling effect upon: the temperature of the furnace. I have found in practice that boxes about two and a half inches in width at their "inner endsand s aced a art -a distance of from 27 :to 45 inc es, 'giV6\ V6I'y sati factory results, althoughI do not of course limit my: self to any particulardimensions of -the boxes or to the spacing thereof. These boxes being set at rightangles to the direction at which the gases travel in the furnace, act to prevent the gases from cutting into the furnace walls,- since they deflect the gases inwardly into the furnace chamber and prevent to a very large degree the cutting of the gases into the irefractory' materialintermediate the boxes.

3 The roof 3 ofthe furnace is protected iri'a similar manner ,by a plurality of water-. cooled boxes or castings 14, which extend transversely of the roof, and which are spaced from each other in. substantially t e same manner as, the boxes 12in the side walls. These boxes 14 are arched transverselyin the manner shown in Figs.- '3 and 5, and extend across the entire width 96 of the furnace roof, being'loosely supported at their ends on the skewback channels 13; These boxes 14 are each divided at or near v the central portion, asshown in Fig. ,3, with the ends abutting each omen-thereby permitting the' sections to move withthe expansion and. contraction of the refractory material of the roof. A cooling medium for these sections is introdu'ced at their lower outer ends-by means of the sup lypipes l5, and the heated water escapes at their and highest portions b means of the pipes 16, thus gins an e eetite circulation ofpreventing the fermation of steam pockets. 11

the cooling fluid through each scetien and rior of the sections may also be provided with" extending entirely through said arch. In

. box at one side, and the one arm 21 with the up er ortion of the box at the opposite ing these boxes entirely through the roof enters the upper portion of the outer end of the section and is deflected downwardlyby which is of refractory material, .is' also pro If desired, the sections may be provided 3 at their outer ends with a dependin legl or pocket 17, as shown at the right hand side of Fig. 8, into which the sup ly pipe 15 leads, so that the water will 1; en introduced at the lowest point of the section, such leg or pocket also providing means by which the section may be readily flushed or washed'to remove any accumulated sedi ment. The'watcr may, however, be intro duced in the manner shown at the left-hand side of Fig. 3, where. the supply pipe 15 means of the interior baffle 18. The intethe. interior braces or separators 129 as shown at Fig. 5, to prevent any tendency to their side walls to colla se.

The boxes 14, like the oxes 12, extend entirely through the roof, so that their inner surfaces form a part of the roof surface of th furnace. The arch 7 between the gas and air ports,

vided with a plurality of cooling boxes 20, WhlOl'l are arranged similarly to the boxes 14,,

the construction shown in Fig. 3, these boxes 20 are each provided withthe laterally extending arms 21 and 22, which extend to and through the side walls of the furnace, the arm 22 being connected with a supply pipe 23, and the 'arm 21 being connected with an outlet discharge pipe 24. The arm 22 connecting with the lower portion of the side. ac box is also referably provided with an interior curved affle 25 for effecting a more efiicient circulation of water therein. Preferably. these baffles are each provided at their upper portion with a small ole or perforation 26 to permit of the escape therethroughpf any steam which may tend to form or pocket at the inlet side of the baffle. g 'j Fig. 4 shows a slightly modified form or one of .the. cooling-boxes for the arch 7., In' this form the arms or extensions 21 and 22 are omitted, and the supply pipe 23 and outlet pipe 24: connect directly with the body portion of the box. I

The boxes in the roof 3 and arch 7"have the same effect as that describedrin con nection with the boxes 12 in the side walls of the furnace. That'is to"say,'by extendwall and arch so that their surfaces are exposed to the gases at right angles'to the direction .of passage of the gases, 'the cutting effect of the latter is very largely decreased, and the life of the roof and arch materially prolonged; while at the same time the watercooled metal surfaces exposed to the gases are of such limited area that their chilling effectis practically negligible. y y

It will of course be understood that theprecise arrangement andlocation of the cool ing boxes will depend in'this caseupon the particular character and construction of the furnace to which the invention is ap lied, the

essential feature of the invention eing the use of cooling boxes having their inner ends extending through the brickwork in the manner and for the purpose described.

' It will be obvious that any suitable arrangement of circulating pipes may be pro vided for supplyingthe several boxes with cooling fluid, and that the boxes may be provided with any suitable interior baffling to? provide for an effective circulation of the water therethrough, as may be desired.

What I claim is f 1. A regenerativereversi furnace, having its side walls provided wit a plurality of narrow vertical openings extending' through the-said walls, and cooling boxes or castings seated in said openings and'presenting narrow vertical inner ends to the furnace chamber at substantially right angles to the direction of the furnace gases, substantially as described.

2. Aregenerative reversin' "furnace, hav:- ing its side walls provided wit ,a lurality of narrow vertical openings entirely t rough the said walls, from "about the hearth level to points near the tops of theside walls, and

cooling-boxes or castings seated in said open} ings and presenting narrow vertlcal mner ends to the furnace chamber at substantially right angles to the direction of the furnace gases, substantially as described.

3. A regenerative reversing furnace, hav-- ing a plurality. of long narrow cooling boxes or castings set into its side walls, and extending entirely through such walls, saidboxes beingspaced from each other and presenting their exposed narrow vertical inner ends to the furnace chamber at substantially right angles to the direction of the furnace gases, substantially as described.

Ill

- lJ'A re enerative reversing furnace, having a roofof refractory material, said roof 1 having .a-iplurality of transverse cooling boxes vor castin s which extendentirely through the .roof to" t e inner surface thereof and which are separated from each other by intermediate portions of the refractory roof, substantially as described. 5. A re eneratiye reversing furnace, having a roof of refractory material, said roof having a plurality of transverse cooling boxes 7 or castin s which extend entirely through the roof tot eiuner surface thereof and which are separated from each'other byintermediate portions of the refractory roof, each .of

said-boxes being formedofa plurality of sections arranged end to end, substantially as described. r

6; A furnace of the class described having its roof or arch of refractory material an provided with a plurality of transverse watertervening portions of the refractory material of the roof; substantially as described.

7. Afurnace of the class described havin its roof-or arch of refractory material and provided With a plurality of transverse relatively narrow Water-cooled boxes or castings extendin thrdugh the entire thickness of the roof to t e inner surface thereof and separated from each other by intervening portions of the refractory roof, and means whereby said boxes or castings are permitted to follow the expansion and contraction movements of the roof; substantially as described. 8. A furnace of the class described having 'my hand.

gas and air inlet ports, and an arch of reractory material separating said ports, said arch having therein a plurality of water cooled boxes or castings extending through the entire thickness of the arch; substan tially as described.

9. A furnace of the class described having gas and 'air inlet ports and an arch of refractory material separating said ports, said arch having therein a plurality of relatively narrow vertically extending water-cooled; boxes or castings whose upper and lower edges form respectively portions of the upper and lower surfaces of the arch; substantially as described.

. Y L. KNOX.

Witnessesi G. M. Vmns,

H, Conwnm I tfstimony whereof, I have hereunto. set-

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