US287945A - Ore-reducing furnace - Google Patents

Description

(No Model.)

2 SheetsSheet l. G A. LAWRENCE 81; B. J. FROST.

ORB REDUCING FURNACE;

No. 287,945. Patented Nov. 6,1883.

INVENTOE S.

ATTORNEY WITNESSES:

(No Model.) 2 Sheets-Sheet G. A.'LAWRENOE 8v J. FROST.

ORE REDUCING FURNACE INVENTOR 5, ivuwhiu glmmmmf i dmmx imk ATTORNEY WITNESSES zzwfi/ filn rrcln STATES PATENT omen cno'ndn A;La;wR-Enc1i,;ori .nEWaYoRmnfY, AND EDWARD J'. rnosr, or l 1. "PHILADELPHIA; PENNSYLVANIA;

:ORE-REDUQING FURNACE.

srnorrrcn'rron forming part of LettersQPatent No. 287,945, dated ,November 6, 1883,

' Application fllcd December 27, 1881. (No model.)

a citizen of the United States, residingat New York, in the county and State ofNew :York,

and EDWARD J FROST, a citizen of theUnited Etates, residing at Philadelphia, in the county v of Philadelphia and State :of Pennsylvania, H haveinvented certain new and, useful Im provements in Ore-Reducing Furnaces; and 'we doli'ereby declare that the following is a full, clear, and exact description of the same, which will enable others skilled in the-art to whichthe invention appertains to make and use the same, reference being had to the accompanying drawings, forming part of this specification.

.Our invention relates to a furnace for the reduction of pulverized ores, its objects being to produce an intense heat in a combustion and reducing chamber bymeans of a blast of pulverized fuel, and to cause the heat so produced tojnot only act upon pulverized ore introduced in a cloud into the chamber, but also to heat a'decomposer arranged inside of said chamber, for the production ofgas fi'om suitable materials introduced therein, which gas is. dischargedwithin' the chamber, and addsby its combustion to the intensity of the heat for the reduction of the ore. j T, The invention consists in a novel combination'oif devices for accomplishing the objects referred to, :as will be hereinaftenfully described, and pointed out in the appendedclaims. In the accompanying drawings, Figure l is a view, partially in vertical section, illustrating our improved furnace and its attachments. Fig. 2 is ahorizontal section on line mm of Fig. 1. Fig. 3 is a detail View, mainly in section, of the coil and injector. Fig. 4 is a sectionalview of a portion of the blast-pipe, showing the check-valvetherein. Fig. 5 is a V I section of the blast-pipe in the plane-indicated 'byfline y 11 ofFig. 4:.

Referring tollig. 1, the letter D designates a combustion and reducing chamber inclosed by walls a of any suitable refractory material,

' and d is a flue leading from the upper portion is supported adjacent to the combustion and able means. The letter B indicates a blast-pipe leadingfrom a blower, A, and having two branches,

reducing chamber by masonry or other suitb b, which enter the lower portion of the chain berD at opposite sides 1 and terminate in upturned portions E, somewhat inclined toward each other near the center of said cupola.

, A hopper, G, is connected with the blastpipe B by means of a shortpipe, c, and suitably mounted at the center of the hopper and of pipe 0 is avertical shaft, 0, the lower portion of which carries a feed-screw, c, and the upper portion of which is provided with radial arms 0. The hopper is for supplying the blast-pipe with pulverized coal,which is properly agitated by the arms 0*, to preventpacking, and is fed forward by the screw 0. The shaft 0' receives rotary motion from .a suitably-geared shaft, and its speed may be regulated in the ordinary manner by an arrangement of cone-pulleys, R R, and a belt connecting the same. I

Between the hopper andthe branch pipes 22 b the blast-pipe is provided with a pivoted check-valve, Q, which normally rests upon an inclined seat, q, and has one of its pivots projecting outside the pipe, and provided with an inclined arm, upon which is arranged an adjustable weight, Q.

In the lower portion of the chamber D is arranged a. vertical pipe-coil, F, the upper turns of which are perforated, as shown at f,

G, arranged in the flue under the-boiler and connected with the steam-space of said boiler. The injector is provided with an air-inlet pipe, J, and may be also connected by a dip- .pipe, as shown at K, with a tank, L, to hold Through the roof of the chamber D is ar-. ranged a vertical hollow shaft, M, suitably disk, 0, with the interior of which the bore of the shaft M is in free communication. Upon the upper end of the shaft is mounted a hopper, P, and below the hopper the shaft is provided with a belt-pulley, N, which may r'e.

ceive motion from a belt, N. A

The operation of the apparatus as now eX- plained is as follows: The boiler being first.

properly supplied with water, thehopper O is filled with properly-pulverized coal, and the blower and shaft put in motion, the valve of the blower being opened. The check-valve Q is opened by the blast, and two jets of the pulverized coal mixed with air are forced into the chamber D inside of the coal. These jets are then ignited through a door, (not shown in the drawings,) and a flame fills or partially fills the cupola, according to the quantity of fuel supplied, the feed being regulated by the adjustment of one of the cone-pulleys R. The heat passing from the cupola through flue d raises-steam in the boiler and superheats said steam as it passes through the return-pipe G to pipe G and the injector. If only'superheated steam and air are to be used, the valve in pipe K is closed and that in pipe J opened, and then a mixture of superheated steam and air will be forced through the injector, and the steam will. be converted into hydrogen and oxygen gasesa-s it traverses the coil F. The hydrogen gas, escaping through the perforations f, becomes ignited, and adds greatly to the intensity of the heat produced by the combustion of the coal-dust. When a proper dergreeof heat is reached within the chamber D, the shaft M is started into rapid rotation, and into the hopper P is. fed the pulverized ore, which passes through the hollow shaft M, and is discharged in a cloud by the rapidly-rotating hollow perforated disk 0. To facilitate the production of gas, especially in the early stage of the operation, the cock in the pipeK may be opened, when the blast of superheated steam will draw up oil through the pipe K and force it through the injector in the form of vapor. The metallic portion of the ore is melted out and falls upon the hearth of the chamber, from which it may be collected in any suitable manner, while the most of the silicious and earthy portions of the ore are carried off by the blast through. the flue d. The check-valve Q, being properly balanced, will close, should the back-pressure of the blast-pipe be sufficient to counteract the blast, so that the coal-dust in the hopper 0 will not be ignited. x

We have not shown any mechanical connection between the. shaft M, cone-pulleys, and blower, as it will be readily understood that they may have motion communicated to them by any .of the ordinary suitable means.

We are aware that a furnace has been pro-. vided heretofore with means of introducing a blast of pulverized fuel thereto, and also that pulverized ore has been introduced in a cloud intoac'ombustion and reducing chamber. We

are also aware that acoil for converting suit able materials into gas has been located in a furnace, and that a coil has been arranged around the outside of afurnace-chamber, and

providedwith openings to the interior of the chamber,for the purpose of dis'chargingtherein a gas producedbya generator independent of the furnace. We are further aware that superheated steam and ahydrocarbon gas have been introduced together into an ore-reducing furnace, and that such furnace has been provided with an outside superheater, fromwhich superheated steam may be discharged among crushed ore passing through a passage to the furnace. -We do not claim any of these inventions. v. Having now described our invention and explained the operationthereof, we claim? 1. In an apparatus for reducing ores, the combination,with a combustion and reducing chamber, means for introducing ablast of pulverized fuel thereto, and separate means for introducing pulverized ore thereto, of a de: composer arrangedwithin said chamber and having openings to the interior thereof, and means for supplying to said decomposer ma: terials which will be converted into combusti, ble gas bythe action of heat thereon,thewhole arranged and adapted to operate substantially as described.

2. In an apparatus for reducing ores, the combination, with the combustion and reducing chamber, of the blast-pipe and connected blower and feed-hopper for supplying p'ulverized fuel to. the blast-pipe, the perforated coil F, arranged within the chamber, means for forcing into. said coil a supply of material to be converted into gas therein, and means forcombination, with the combustion and reducing chamber, fuel-blast devices, and the decomposer arranged within said chamber and provided with openings to the interior thereof, of the boiler arranged to receive heat from said chamber, and connected with said decoms poser by a suitable steam-pipe, and means for introducing ore into said chamber, substan-. tially as described. I 4, In an apparatus for reducing ores, the combination, with the combustion-chamber provided with means for introducing ore and producing heat therein, the perforated pipecoil arranged in said chamber, and the. boiler connected with said pipe-coil byasteam-pipe;

of an injector arranged'in said stew-pipe to.

discharge into said coil, and one or more ad ditional pipes connected with said injectorforsupp yi g a d 0r flu s t a mraay the steam, substantially as described. 5. In an apparatus for reducing ores, the, combination, with the combustion-chamber,

means for introducing ore and pulverized fuel In testimony whereof we aflix our signatures therein, the perforated pipe-coil within said in the presence of two witnesses.

chamber, and the boiler connected with said GEORGE A. LAYVRENCE. pipe-coil by a steam-pipe, of an injector ar EDWARD J. FROST.

5 ranged in said steam pipe, and an oil-tank W'itn esses:

conneotedwit-hsaid injector by a-suitable pipe, G. M. SLOOUM,

substantially as and for the purpose set forth. JNo. TAYLOR.

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