US1308404A - Planckihaph co - Google Patents

Description

G. F. DOWNS.

OPEN HEARTH FURNACE.

1,308,404. APPLCATION FILED MAR. 5. 1918. Patented 1 3 SHEETS-SHEET I.

i; @Ma MJ@ G. F. DOWNS.

OPEN HEARTH FURNACE.

nPPLlcATIoN FILED ma. 5. m18.

1,308,404. Patented July 1, 1919.

3 SHEETS-SHEET 2.

THB COLUMBIA PLANDGIIAPH co.. wAsHlNa'roN. D. cA

G. F. DOWNS.

OPEN HEARTH FURNACE.

APPLICATION FlLED MAR. 5. 191B.

Patented July 1, 1919.

3 SHEETSASHEET .'iA

5521112712271" e/oaww 5TM@ G60 @y M UNITED sTATEs PATENT oEEIoE. N

GEORGE F. DOWNS, 0F BUFFALO, NEW YORK.

OPEN -I-IEARTH FURNAOE.

Application led March 5, 1918.

To all whom t 'may concern.'

Be it known that I, GEORGE F. Downs, a citizen of the United States, and a resident of Buffalo, in the county ot Erie and State of New York, have invented certain new and useful Improvements in Open-Hearth Fur naces; and I do hereby declarethat the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters of reierence marked thereon, which forni a part ci this specification` This invention relates to certain novel and useful improvements in open hearth furnaces and more particularly to improvements in the construction of the gas lines or ports of such furnaces, and consists of the matters hereinafter described and more particularly pointed out in the appended claims.

In furnaces of the kind, the gas ports, being generally made of refractory material, are subject to rapid disintegration and destruction under the action of the intense f heat, ynecessitating frequent repairs or renewals, which are not only expensive in themselves, but interrupt the operation of the furnace, thus greatly increasing the expense. To remedy this condition, means have been providedfor water-cooling such ports, but the constructions so far designed, have either had refractory linings or have had bottom Walls made of refractory material. `Such water-cooled `ports have proved inefficient sincef'they are gradually closed or choked `up by deposits of earthyy particles from the outgoing waste gases, lso Athat after a very. eWdayS, proper `eration isy Inateriailglyiinterfered with an it isf necessary to delayf'the` operation of the lfurnace in order to remove some of the deposits. Not only is the work of removing the deposits very laborious, but complete removal of such deposits is 'impossible :since the deposits fuse withfthe refractorj;y material'of the bottom wallrof the port andare in such" position thatthe tools used' for their removal are affected bythe heat'ofthe' furnace and are quickly made useless..y f

The objectof my invention is'to provide a gas fluelor portconstruction which willobviate these and othervobjections 'te watercooled ports heretofore suggested, and

which will also possess other advantages which will appear moreclearly and` willwbe Specification of Letters Patent.

Patented July 1, 1919.

Serial No. 220554.

more definitely pointed out as I proceed with my specification.

In the drawings:

Figure 1 is a view representing in longitudinal section one end of an open hearth furnace provided with my in'iprovements.

Fig. 2 is a view representing a horizontal section through Fig. 1 in a plane indicated hv the line 2-*2 of Fig, 1.

Fig. 3 is a view representing a vertical section through Fig. l in a plane indicated h v the line 3-3 of Fig. 1.

Fig` 4L is a view representing a vertical secH tion through Fig. l in a plane indicated b v the line 4 4 thereof.

Fig. 5 is a view representing a partial section through Fig. 1 in a plane indicated by the line 5-5 thereof.

Fig. fis a view representing a longitudial central section through my improved Fig. 7 is a View of said lue in top plan.

Fig. 8 is a view representing a transverse section through the flue in a plane indicated hv the line 8-8 of Fig. 6. A

While the drawings show onli,7 one end of the furnace, it willbe understood that the construction is duplicated at the other end.

Referrin now to that embodiment of my invention ilustrated in the drawings z-10 indicates an open-hearth furnace, and` 11, the furnace chamber. (See Figs.v 1 and 2f.)A 12 indicates the gasup-take; 13, 13, the air uptakes; 14, the gas port opening to the` i furnace, and 15, the air port. These parts, so far as their general arrangement `and construction are concerned, are familiar and needinenturther description.

16 indicates my improved gas port or lue, which provides the connection betweenI the gas upftake 12 andthe furnace chamber l1. (See Figs. 1,6 and 7.) Said Hue is made of metal, It consists of two concentrically arranged, radially spaced, tubularfmembers 17, 18, which are arranged with theirlongl.- tudinal centrallaxes inV a line common to both, thus providing between *them a jacket space or compartment 16a, whichsurrounds the port or ues ace defmedb the inner tu`` bularmember. Y'lheiiuama-y ave airegular or irregular' form in crossesectionybut 'the form illustrated is cylindrical.

The jacket spacey 16a is closed at both ends in i any coni oi a pipe 19, to a sourceol supplycf Some coohng medium, as water, and by a pipe 520, to a place for dxschar Jemol the coolm(r medium after it has circula ed through said` the opposite end of Isaid jacket space. This` arrangement is preferred, since it compels the cooling medium to travel the full length of the jacket space before it is discharged: but the arrangement may be varied or reversed without departing from the spirit oi' the invention, so long as a circulation of the cooling medium is produced.

The Hue 16 is positioned in the gas port opening 14 of the furnace. 21 indicates the partition wall dividing the air port 15 from the furnace gas port space 14. The inner end of the Hue 16 terminates at the inner end of said partition Wall 21 and its outer end extends Well Within the upper end of the gas 11p-take 12. The flue thus provides a Water-cooled. metal passageway. completely inclosing and surrounding the gas or other fuel on its Way from the gas uptake 12 to the point Where it joins the air entering the furnace chamber from the air port 15. The Word fiue:'ina.y thus be aptly used to describe the part 16 and to refer to it in its entirety and will be so `used hereinafter.

It isto be noted thatthe inner or orifice end of the Hue 16 is iliade in a plane at righi angles to the centralaxis of the liuc. This feature of construction is important and acts to impart to the flow of gas a better or more direct discharge toward the hearth of the furnace, than would be the case if it were in a vertical plane.

The water that must be depended upon for cooling purposes :it steelrip'lants, Where furnaces of. the kind arel usedi's apt to con tain 'la large amount of' sedinrient,l and I therefore provide in connection with the im proved flueg or rather with its cooling jacket-space or compartment, a cleanin idei;`

api een .endlV vice as follows: 22 indicaties I p ing longitudinally through the jacketisjpace 1cl between the tubular memeemirjae, in

a direction parallel Lto the loln'giiiidinal central :axis of the flue Said' 'pipe isn supportedbeyond the f flue ,within a pipe 23 of larger diameter, which is xedin the outer head-.of the jacketf's iaceland which: rests upon or is builtin ghe 'top Wall of the gas uptaliewiQ.' (See Fi 55.11` audio.)

The pipe 22'1projects' rough .tlie endy orf the tube 5 'which le'ads from any suitable source of air under' 'pressure A valve 22"i controls the supply tothe pipe `22.l *The inner end of the pipe l22is connectedy to a perforated, curvednomle `pipe 26 vwhich is located ina `lip-take until it reaches thepoint of contact` plane at right angles to the longitudinal axis of thc fiue1 and extends, as shown` about three-quarters wajY around the com plete perimeter 'of the water space or jacket..

By this construction.` the pipe 22 with its` connected nozzle pipe :3(3. may bc reciprocated within thc jacket space 1U, so as to bring compressed air, discharged into the pipe 22 through the flexible pipi 25 and escaping through the [,lcrforations of the curved nozzle pipe 26, into forcible `engagement with the Walls of the jacket space throughout its length. Said pipes 22, 26, by thevdischarge of the air, produce an `agitation of the Water in the jacket space so as to dislodge any'particles of solid material that may have collected, settled or have become incrusted upon, the inner faces of the Walls of the jacket space, and the solid matter thus dislodged, is carried olf in suspension by the cooling Water, as it is discharged through the pipe 20. Y

The importance of the cleaning device thus provided, is apparent, since an accumulation of sediment and solid matter in the jacket space would soon clog and fill or choke it and prevent its operation 'in the manner and for the purpose intended.

From theforegoing description, it will be manifest that my improved Hue is a sepaF rate, integral, Watercooled structure, capable of use in any open hearth other metallurgical furnace wherein its `use would be desirable or necessary. .lt presents a complete, bare metal passageway from the gas ip-take to the point Wherethe gas or fuel is to combine with the air and this bare metal passageway is completely surrounded by a cooling Water jacket, which Will give it the necessary protection against the intense heat. Since the Whole inside of the flue is water-cooled metal, the deposits of .earthy particles from the outgoinggases arepre I vcnted'from fusingor Welding to theilower "prevented or at least retarded or reduced,`

but. since such` deposits will many casejbe loose and frees they may be easily,

the operation of the furnace. i i The` flue alone controls the flow of the furnace or rapidly w and completelyremoved, With no` delay in 115"` gas or fuel `from the time it leaves thegas'1 l with the air, vregardless of thetype of .coni

struction of air-uptake andy air port in the space occupied yby the length of thewilied` Thus it will `be readily seen thatithe use'of my flue Will permit many changes a'nd modi-` `lcations in thetypeof airiup-takearid wir? port construction, which` have'` been` hertov;

fore impossible withY prior `oonstructiosl of `gas ports. f i

Whiletin describing my` invention.; I' have; f

refeured to certain dtails of mechanical struction and arrangement of parts, it is to be understood that the invention is in no Way limited thereto except as may be pointed out in the appended claims.

I claim as my invention:

1. In combination with an open hearth furnace of the kind described, a straight, metallic, tubular flue supported Within said furnace, said flue connecting the gas uptake with the interior of the furnace, means providin a jacket space entirely surrounding said ue, pipes for admitting Water to, and for dischargin it from, said jacket space, and a nozzle plpe in said jacket space and movable lengthwise of the same from Without the furnace for agitating the cooling Water in said jacket space.

Q. In combination with an open hearth furnace of the kind described, a straight, me tallic, tubular flue supported Within said furnace, said Hue connecting the gas uptake with the interior of the furnace, means providin a jacket space entirely surrounding said ue, pipes for admitting Water to, and for discharging it from, said jacket space, and a device reciprocable in said jacket space adapted to remove sediment Jfrom the jacket space Walls, so that the sediment may be dis charged with the cooling Water from said jacket space.

3. A flue of the kind described, comprising concentrically arranged inner and outer metal tubes joined at their ends to form a jacket space for a cooling medium, inlet and discharge pipes for the cooling medium connected to Said flue, and an agitator device terminating in a nozzle ring interposed between said tubular members and projecting beyond the outer end of said flue, said device being adapted to be reciprocated Within said jacket space.

4:. In combination with a flue of the kind described having a cooling Water jacket space, an agitator device reciprocable in said jacket space, said agitator device consisting of a pipe extending longitudinally through said jacket Space and having a perforated, arcuate nozzle, the outer end o said pipe projecting beyond said Hue and being adapted for connection to a source of fluid under pressure.

5. In combination With a Hue of the kind described having a cooling Water jacket space, an agitator device reciprocable in said jacket space, said agitator device consisting of a pipe extending longitudinally of said jacket space and having a curved, perforated nozzle extending about said jacket space, and means for supplying a fluid under n pressure to said agitator device.

6. In combination With a cooling Waterjacketed flue of the kind described, arranged at an angle inclined to the horizontal, pipes for admitting Water to, and for discharging Water from, the jacket space of said fine, a mechanically operated cleaning device adapted to be reciprocated in said jacket space, and an open pipe connected to the outer end `of said jacket Space, forming a passageway through Which the operative end of said mechanically operated cleaning device projects, said pipe being arranged parallel to the longitudinal axis of the flue and extending outwardly, at the same angle of inclination, to a point spaced vertically above the elevation of the cooling Water discharge pipe.

In testimony that I claim the foregoing as my invention, I aiiix my signature in the presence of two Witnesses, this 1st day of March, A. D. 1918.

GE-RGE F. DOWNS.

Witnesses J ULE WUNsoH, WALTER J. BRYAN.

Copies of this patent may be obtained tor ive cents each, by addressing the Commissioner of Patents, Washington, D. G.

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