US491274A - Desulphurizing-furnace - Google Patents

Description

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T. THOMAS.

DBSULPHURIZING PURNAGE.

No. 49l,274.

Patented Feb. 7, 1893.

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TH ms PETERS co. Pnommwo.. wasumum UNITED dfrnrns Parent @erica THOMAS THOMAS, OF DENVER, ASSIGNOR OF ONEJIALF TO .TOSI/ill. BURGESS, CF ARGO, COLGRADO.

DESULPHURlZlNG-'FURNACE.

SPECIFECATON forming part ot' Letters latent No. 491,274, dated February 7, 1893.

Application tiled April 25, 1892 Serial No. 430,618 (N0 model.)

.To @ZZ whom t may concern.'

Be it known that l, THOMAS THOMAS, a citisen of the United States of America, residing at Denver, in the county of Arapahoe and State of Colorado, have invented certain new and useful Improvements in Desulphurizing- Furnaces; and l do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the iigures of reference marked thereon, which form a part of this specification.

My invention relates to improvements in furnaces for desulphurizing chloridizingor roasting ores, and particularly to that ty pe of these furnaces in which the carriages for the endless distributing chain, are located at the sides of the roasting chamber and protected from the heat of this chamber by fire-brick partitions extending the entire length thereof. These partitions are provided with a longitudinal slot located at about their vertical center, in which the shaft travels which connects the carriages located on the opposite sides of the chambers. This slot divides each of these partitions into two longitudinal sections, namely, one supported on the bottom of the chamber and projecting upwardly, and the other supported from the arch above the chamber and therefore depending or projecting downwardly.

My improvement relates specially to this depending section of the partition, since as the furnaces have been constructed heretofore they have been found impracticable by reason of the fact that these depending sec'- tions of the partitions are soon destroyed, presumably by the expansion of the metal brackets which form the support for the tile sections. The metal brackets supported by rods secured in the arch above are provided with lugs or hooks which engage apertures formed in the tile sections and thus support the depending portion. ln practice and under the iniuence of the degree of heat necessary in a furnace of this character, these tile sections soon crack and break away and unless repaired at once (which can only be done by shutting down and cooling the furnace) the metal carriages are exposed to the same degree of heat as the ore in the chamber, and therefore soon destroyed or rendered worthless, whereby the object sought by locating the carriages at the sides of the furnace, namely to better protect them from the heat of the roasting chamber, fails of its accomplishment. Hence to overcome this diiticulty is the object of my present invention, and I attain it by the employment of the features, arrangements and combinations hereinafter described and claimed.

My improved Afurnace will be fully understood by reference to the accompanying drawings in which is illustrated an embodiment thereof.

In the drawings, Figure l is a vertical cross section of the furnace taken on the line c-,

Fig. 2, which is a vertical longitudinal section taken on the line gj-y, Fig. l. Fig. 3 is a fragmentary perspective view of the metallic support for the tile sections, one of which is shown in place. Fig. 4f is a fragmentary horizontal section taken on the linee-c" Fig.

l showing a plan View of the lower roasting" chamber.

Similar reference characters indicating cor responding parts or elements in the several views let the numeral 5 designate the vertical side walls of the furnace provided with the upper and lower longitudinal roasting or desulphurizing chambers G and 7 respectively.

The side walls are connected by the transverse arches 8 and 9 which form the top walls of the chambers and other arches l0 and l2 which form the corresponding bottom walls. These chambers are supplied with heat from the fire boxes 13 and 14 located at suitable intervals outside the main side walls 5 of the furnace, the heat first taking the direction indicated bythe arrows and passing through the openings l5 formed in the upper walls or arches and then traveling longitudinally through the chambers in the direction of the 9 stack. The ore to be treated is first fed to the upper chamber through a hopper i6 located at what l shall term the forward end of the furnace. From the forward end of chamber 6 the crushed ore is carried by the IOO endless distributing chain 17, tirst to the rear end of the chamber whence it passes to the corresponding extremity of the chamber below and is carried through this chamber to the forward extremity of the furnace, and discharged properly roasted or desulphurized.-

This endless distributing chain 17 passes over the terminal wheels 1S and 19, the former as shown in the drawings being journaled in a suitable stationary support and rotated by applying power to its shaft in any suitable manner, thus communicating motion to the chain. Vhcel 19 is journaled in a movable support 19a provided with a weight 19c connected with the movable support by a chain 19*l passing over a roller 19g journaled in a suitable framework 19. This construction maintains the distributing chain at the proper tension. This chain is interinediately supported by the carriages 2O mounted upon track rails 21, each pair of carriages being connected by a transverse shaft 22 which moves in the longitudinal slot 23 separating the upper and lower parts 2t and 25 of the tire brick partition separating the roasting chamber proper from the lateral chambers 2G in which the carriages 2O move. The upper part 2-1 of this partition is composed of sections supported in a longitudinal wedgeshaped groove or socket 27 lformed in metallic bars 28 which are cast in sections of suitable length and bolted to the upper arches 8 and 9 of the roasting chambers in such a manncr as to form a continuous groove or socket the entire length of the chambers on each side. This socket-groove is wedgeshaped in cross section, being largest at the top and tapering downward as shown in Figs. 2 and 3. The upper edge 24 of the hre-clay tiles or sections constituting part 2l of thc side partit-ion is shaped to correspond with the `groove 27 which it enters, being made sufficiently small to slide easily therein, since the sections must loe inserted at the open extremities of the socket-grooves and moved along until the entire upper part 2t of the partition is formed. Since the sect-ions fit loosely in the groove as shown,all injurious results from the contraction and expansion of the metal bars is avoided. The tile sections are provided on the inner side with a longitudinal projection 29 which extends below the lower inner edge of metal bars 28 and thusprotects this edge from the heat of the roasting chamber. The inner sides of these metal bars are protected by a depending tire-brick partition 30 set into and forming a part of the upper arches S and 9 of the desulphurizing chambers.

In order to form a continuous longitudinal support the entire length of the furnace for the metal bars 2S and the depending tire clay partition connected therewith the upper arches 8 and 9 are made continuous in front of the tire boxes, on each side of the openings 15, and of the same thickness as the rest of the arch. As heretofore constructed these arches have been interrupted in front of the fire boxes the entire width of the furnace, a thin plate of fire clay having been placed immediately in front of the tire boxes and over which the heat passes to the openings leading to the roasting chambers, said tire clay plates being supported by metal bars underneath, which form the support for the depending metal brackets heretofore mentioned. Experience has proven that these bars soon become so warped and misshapen by the heat, that the depending brackets and the tire clay partition which they support are practically useless.

The use of the tire clay plate in front of the tire box in the old style of furnaces leaves a passage way for the heat between said plate and the top of the arch,whilein my improved furnace, the arch being of the usual thickness in front of the fire box, a space 40 must be left above the arches S and 9 to allow the heat to pass to openings 15. In the case of arch S this is accomplished by forming a transverse auxiliary arch 45 above opening 15 and across thc furnace, this arch being supported by walls or partitions 46 located on each side of opening 15 and resting upon the main archS. The furnace is so constructed that a space is left between the arch 9 and the bottom of the chamber above, this space extending the entire length of the furnace. Now to drive the heat directly to the roasting chamber transverse partitions t8 are constructed on each side of the opening 15 and reaching lfrom the arch 9 to the bottom 12 of the furnace next above. The spaces 50 between partitions 48 form air chambers or spaces through which transverse tie rods 55 pass and whereby they are removed from excessive heat. In the old style furnace these tie rods are embedded in the arch and therefore more exposed to the heat than in the air chambers 50 of my improved furnace.

In front of the iire boxes the extremities of the bolts 2Q which support bars 24 are protected by layers of tire brick, while in the air chambers these bolt extremities are exposed and accessible without difficulty when repairs are needed; while in the style of furnace heretofore used, these extremities of the sustaining rods are embedded in the arches and can only be reached with great difficulty.

In the construction of my improved furnace I prefer to make use of the inclined grates (50, since tine coal or slack may be poured thereon without clogging or choking the grate. The coal is fed to these boxes through openings 13 and 1Q. Any desired number of these boxes may be employed. More of the boxes are used in connection with the lower chamber than the upper one, since the ore is first fed into the upper chamber, and when first exposed to the heat gives off a greater quantity of sulphur than subsequently, and the combustion of this sulphur forms a part of the Vfuel or takes the place of coal to a certain extent; while by the time the ore reaches the lower chamber it has been IOO IIO

deprived of the greater part of its sulphur and more coal must be employed to furnish the requisite degree of heat, hence the lire boxes communicating with the lower chamber are more numerous. The heat takes the course indicated by the arrows through the lower chamber to the rear and up through channel G5 to the upper chamber and thence baci; to the front thereof and escapes through channel G6, taking a downward course as indicated by the dotted lines in Fig. 2, to one side of the furnace and thence through passage way 6?' underneath arch lO and out to the stack 68.

Having thus described my invention what l claim isz- K l. A desulphuriziug and chloridizing furnace having an endless distributing chain supported upon side carriages in combination with depending partitions lying between said carriages and the roasting chamber proper and supported in wedge-shaped socketgrooves, the edges of the partitions received by the grooves being of corresponding shape, substantially as described.

2. A desulphurizingfurnace having an endless distributing chain suitably supported at the extremities of the furnace and intermediately supported by side carriages, of partitions separating the carriage chambers from the roasting chamber proper, and composed of an upwardly projecting part and a depending part, the latter being supported in wedge-shaped socket-grooves formed in metal bars secured to the top walls of the chambers, substantially as described.

3. The combination in a desulphurizing furnace having two chambers one located above the other and an endless distributing chain supported on side carriages, and passing through both chambers of metal bars secured to the upper arches of the chambers and provided with wedge shaped socket-grooves, and depending partitions fashioned to enter said grooves and located between the carriage chambers and the roasting chamber proper, substantially as described.

il. The combination in a desulphurizing furnace having two chambers one located above the other and an endless distributing chain supported upon side carriages, and passing through both chambers ot partitions separating the roasting chambers proper from the carriage chambers and consisting of a suitable upwardly projecting part resting upon the bottom of the chamber and a depending part, the latter being supported by bars provided with socket grooves for the reception of the correspondingly shaped edge of said depending part, substantially asJ described.

5. A desulphurizing furnace having upper and lowerchambers and an endless distributing chain provided with supporting carriages and passing through both chambers in combination with partitions separating' the chambers into a central roasting compartment and two side compartments for the carriages, each partition being composed of two parts, namely a lower part supported by the bottom ot the chamber and a depending upper part supported by bars having wedge-shaped grooves for the reception of the upper edge of the partition which is correspondingly shaped and adapted to lit loosely therein, substanl tially as described.

6, The combination in a desulphurizing turnace having upper and lower chambers, of partitions composed of lire clay tiles, and separating each chamber into three longitudinal compartments, namely, a central compartment for roasting the ore and two narrow side compartments for the carriage supporting the distributing chain, each partition being composed of two parts, an upwardly projecting part resting on the bottom of the chamber and a depending part composed of sections having their upper edges wedgeshaped, and metal bars secured to the top ot the chambers and having grooves of corresponding shape for the reception of the wedge-shaped edges of the partition-sections, substantially yas described.

7. A desulphurizing furnace having upper and lower chambers and an endless distributing chain supported by carriages, and passing through both chambers of lire clay partitions dividing each chamber longitudinally into three compartments, each partition being composed of two parts, the upper part being composed of sections having their upper edges wedge-shaped and supported by metal bars having socket grooves of corresponding shape for their reception, the depending sections being provided with inner projections adapted to protect the lower edges of the grooved bars from the heat, and the top of the arch being provided with a depending tire-brick protector for the sides of the metal bars, substantially as described.

8. A desulphurizing furnace having dreclay partitions dividing the chambers longitudinally each partition having a depending sectional part, the upper edges of the sections being wedge-shaped and supported by metal bars secured to the upper arches, of the chambers and provided with socketgrooves in which the wedge-shaped edges of the partition sections iit loosely, the metal bars being suitably protected from the heat of the furnace, substantially as described.

9. A desulphurizing furnace having upper and lower chambers and suitable lire-boxes communicating therewith, the upper arches of the chambers being continuous in front of the tire boxes and between said boxes, and suitable openings. in the arches for the passage of heat to the chambers, there being a space left above the arch to allow the heat to pass from the tire box to these openings, substantially as described.

l0. A desulphurizing furnace having upper and lower chambers, and suitable lire boxes communicating therewith, the upper arches of the chambers being provided with central IOO openings in front of the tire boxes, said arches being continuous between these openings and said boxes, there being a space left above the arches for the passage of heat from the fire box, the heat being directed to the openings by transverse partitions on each side thereof, substantially as described.

ll. In a desulphurizing furnace the coinbination of the upper and lower chambers, the endless distributing chain located therein and supported by side carriages, (ire boxes communicating with the chambers through openings in the tops of the arches above the chambers, said arches being continuous between the openings and the fire boxes, and metal bars secured to said arches and provided with dovetail-sockets or grooves forming a continuous support for the depending partition sections which separate the carzo riage compartments from the roasting compartment of the furnace, substantially as described.

12. A desulphurizing and chloridizing furnace having upper and. lower chambers, iire boxes communicating therewith, the upper arches ofthe chambers being continuous except where the openings are left for the passage of heat to the chambers, a space being left above the arch of the lower chamber, transverse partitions on each side of the openings in this arch and intermediate air chambers through which the transverse tic rods pass, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

THOMAS THOMAS.

iVitnesses:

WM. MCCONNELL, MURrEL STRODE.

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