US1576033A - Industrial furnace - Google Patents

Description

March 9 1926. 1,576,033

H. H. BUBAR INDUSTRIAL FURNACE Filed August 10. 192s s sheets-sheet 2 March 9 1926.

H. H. BUBAR INDUSTRIAL FURNACEv Fi1ed`August 10, 1923 3 Sheets-Sheet :5

Vertical sectional view on Patented Mar. 9, 1926.

UNITED stare PATENTI oFFlcE;

` HUDSON H. BUBAR, or NEW Yemen. Y.

INDUSTRIAL `'FUnNi/ioii..

Application filed August 1o, 1.923. serial No. 656,656.

tion having complete mechanical control of the roasting land oxidation (when required) from the time the material enters until it is discharged. In carrying out this invention I preferably employthe combination of a reverberatory furnace and a preheater ar- 'ranged to discharge the material on to a horizontal hearth. `Within the furnace l lf provide a rabbler which is adapted to travel back and forth within the furnace and thor oughly mix up and turn over the material being treated. Details of construction and mode of operation will be understood from" the 'following description and the Aaccompanying` three sheets of drawings.

Fig. 1"is al horizontal section'andplan showing parts of the apparatus more or less diagrammatical. j

Fig. 2 is a corresponding longitudinal the plane. of the line 2 2Nof Fig. 1.

Fig. 3 is a transverse sectional View on the plane ofthe line 3 3 of Fig. 2 on a somewhat larger scale. 1 v

Fig. 4 is a side view of one form of rabbler.' j f j Fig. 5 is a fragmentary plan view of part ofthe rabbler looking in the direction of the line 5 5 of Fig. 6.

Fig. 6 is a fragmentary edge View of the parts'of the rabbler looking in the direction of the line 6-7-6 of Fig. 4f. f

Figs. 7,` 8 and 9 are detail views'of a modified form offrabbler.

Fig. 10 is a side view showing cooling bars. p 4 Y Fig. 11 shows details of the mechanism for adjusting and moving the cooling bars on the line 11-11 of Figure 12.

Y Fig. 12 is a detail View of parts of the mechanism shown in Fig. 11 and taken on the line 12-12 thereof.

The substance to be roasted is fed into the preheater through the hopper and chute at fveyor 8 where it is finally discharged 1 in F ig. 2, is gradually carried through the preheater to point of discharge at'2 whereit is dropped through flue 3 to heartht being graduallycarried forward by rabbler 5 to point of discharge 6 where it falls on inclined cooling plates 7 and Vthence to confrom the furnace. y

Air', is drawn in through conduitsrQ, and

`passes, between j the cooling bars and the material thereon and` also through the-*fire box 10 andfover'the. wall 11r and Aback through lthe chamberV 12. rThe gases pass outY flue 3 around the preheaterY and outrthe chimney` or stack 13. The circulation in the hearth not only keeps the;hearth cool but pre-heats the air going to the furnace. The hearth 4 may also have `cooling passages, 9. Itvr should be understoodk that although the furnace is shown as arranged for coal, gas

or'oil may be provided for `if desiredwithin Athe spirit of my invention.

The preheaterfor the ore or'other material consistsofa rotating steel cylinder 14 in a chamber 15 formedin a fire brick shell. Baflies'16 and 17 may be provided to provide a tortuous passage for'the waste gases so as to vpreheat the material to as high a temperature as 'possible or to the temperature required. ySupplementary flue 18 or. by-pass maybe provided if desired with ajdamper 19 or control element. The spring of the archy 2O is preferably designed so as to reflectl directly on the hearth. l t

The rabbler has two side frames 22. pro'- vided with wheels 23 andj2t which travel von tracks 25 and 26 beneath the side edges of the hearth. Track 26 and wheel 2,4 at one sidel maybe so designed as to` permit side ways expansion and contraction of the rabbler. Upper guides 27 and 28 may be provided for preventing the rabbler fromA rising. p

The sides 22 of the carriage, the shaft`29 and blades 30 and 31 of the rabbler are all hollow to permitcirculationof air for cooling thevrabbler parts and insome cases for oxidizing the material to be treated. The blades may have outlets 32 for admitting air directly to the ore or other material.

Air is supplied to the rabbler through flexible hose y33 adapted to be wound on air drum 34. An equalizing spring and ratchet 35 maybe employed to keep. a uniform tension on the drum and hose. "The drum is driven with the shaft 36 Which is connected to the rabbler drive so thatthe-rab- `bler and hosewill move synchronously.

The rabbler carriageis moved back and forth by the chains 37 atanyfdesired 'speed' and it may be reciprocated for a part of the length of the-hearth at any placeron? the hearth or the. entire length. The preferred form of rabbler is rotatedby chainBS from shaft 39 and gears40 driven in any suitable Way for instance` stationary rack or chain 40'.'

material thoroughly. The normal position of rest for therabbler is in the chamber 4l beyond theflue When the `rabbler starts toward the fire box `it `rotates idlygover` thehearth, the shaft 39 beingy provided With a one-Way automatic clutch 39. When it starts back` on the re# turn 4trip the shaft 29 and blades start rotat-` ing clockwise asvievved in Fig.'2,thereby mixing and'oxidizing the material While.

forcingiit a certain d istancealong toward the discharge-incline 7. Y

The rabbler shown inFigs. 7, fandQ'ha-s tWo sleeves or shafts 42, 42 fWith vlingers 43,V

43. These shafts`42 and 42" are connected by a link 44 'so that `they-may be. rocked by a rod 45 and crank 46. The lingers 43 and 43 may be lifted .at any time byv means f of the rod45. These rabbler fingersact like the teeth of a rake When the rabbler moves toward the iirebox and carry along some of the material toward the inclined dis-H charge 7 When the material falls upon the cooling y plates it is partially cooled and oxidized by the admissionY of air and discharged on the. conveyoriS` or onto another hearth like 4 Where it maybe again treated.`

The inclined plates 47 are `supported.nearl the middle of their ends by rollers 4 8`andA are also provided Vv vith extensions 49 which are hinged tobars 50. Bars 50 aresup- `orted by rollers. 51 carried by f bars; 52.

' increase or decrease the opening 57 Vbetween adjacent plates and thus admit moreoi`- less air as desired to the hot material; i

.In cases Where the introduction ofair di"- rect` to `the oreior other substance isf disadvantageous the rabbler Would have no discharge outlets but the cooling air could be The blades onthe rabbler arestaggered or offsetso as to sweepevery part" kofthe hearth and turn over and lnixthe.l

admitted into the rabbler through one side and out the"otherxo`r out througlrsomepart of i the rabbler Wherethe air Will not 1come in direct contact with the material being treated.

Itshouldal'soloe-understood that air may be admitted through the rabbler to the ore aircan be admitted, during part of the rabbhng stroke `and"cu`t"oif during the remainder.l Although I have referred to the in vention .as particularly adapted to roasting ores, itf should be understood-that the 4ape@y paratus is` alsousefui for drying'or other-Qk Wise treatingfrvarious other materials. Y

. VVhatI claim iszl. A." roasting furnace comprising, ex.- tended stationary hearth for treating mate# rial with the products of combustion, a.

rabbler movable longitudinally ofA` said hearth, a pre-heater for dischargingfmatei rial upon one end. of said hearth, and.4

means for passingthe gases from the mate,-` rial around the Voutside ofthe pre-'heater Without contact' With the materiall inthe pre-heater. i f,"

2. `A roasting furnaceqcomprsing al lon,-

gitudinally extending hearth having air` cooling passages, supporting tracks mount-fV edV beneath the opposite edges offl said hearth,v `side frames extendingjabove and belovvfthe opposite sidesof said hearths,`

each side frame having Wheelssupportedon said tracks, a rotating'rabbler carried.` by `said side frames above said hearth, and', means for moving said'frames alongsaid tracks androtating said Vrabble-r above saidL hearth. 3L Ina furnace, alongitudinallyA extend? .ingliearth, a rabbler rotatably'mountedfft travel back and lforth over said ,-hearth,v saidV rabbler having air passages, a drumyiiexiblehoservound on said drum and connectedht said rabbler, and means for niovi1ig'`,`said. rabbler back'and forth. y y f 4. A furnace comprising an? extended hearth, a rabbler mechanism movable along said hearth and having4 a frame with` ali-lair" passage, anda` rotating rabblerg'member having blades With' air Voutlets" in theends f 115 5. `In a furnacegfa rotating pre-heaterV Y of said blades. i l

having means for admitting orefat'o'ne end,JE and means, for dischargingfore from-,the other end, a roastinghearthhaving `onefend arranged4 beneath the discharge end" offsafidt pre-hea`ter,y meansfor passinggases from` the` material being roasted around the out# Y side of the pre-heater and: automaticmeans for Vmoving the ore along saidlhearthl Y 6. In a furnace`,a pre-heater having-a' passage through which ore is di'schar ed into the furnace, and through" which?. Tot

gases pass out around the pre-heater,4 anda supplemental controlled "passage leading from the furnace to saidpre-heater:

7. In a furnace, a series of inclined discharge plates for the roasted ore, and means for moving said plates back and forth and up and down. l 8. In a furnace, a series of inclined ore discharging plates, means for adjusting them vertically and means for reciprocating said plates.

9. In a furnace, an inclined cooling grate having discharge plates for roasted ore With controllable openings therebetween.

10. In a furnace, a hearth, a rotating rabbler having blades movable along said hearth, and means for admitting air through said blades for directly controlling the oXidization of the substances being roasted.

1l. In a furnace, a hearth, a rabbler hav-4 ing rotatable blades movable along said hearth, and means for admitting air through said blades for controlling 'the oxidization of the substances being roasted.

12. In a furnace, a presheaterhaving a passage through which ore is discharged into the furnace and through which hot gases pass out around the pre-heater, and a supplemental passage leading from the furnace to said .pre-heater and means for rab-v bling the ore in the furnace.

13. In a furnace, a pre-heater having a rotating drum and divisional partitions and baliies for causing heated gases to pass around said drum and means for controlling the How of gases. I

14. In a furnace, a series of inclined discharge plates for the roasted ore, and means for separating said plates.

15. In a furnace, an inclined cooling grate having plates for roasted ore and having controllable openings therebetween and a transverse discharge conveyer at the llower end.

16. In a furnace, an extended hearth, a rotatable rabbler movable above said hearth and having air outlets, a power driven drum and air hose Wound on said drum and kconnecting said drum and said rabbler.

17. In a roasting furnace, amovable air cooled rabbler, an air drum, a flexible air` hose onrsaid drum connecting the drum and rabbler and spring actuated means fo maintaining tension on the hose.

HUDSON H. Busan.

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