US1109241A - Metallurgical furnace. - Google Patents

Description

E. MGCABE.

METALLURGIGAL FURNAGE.

APPLICATION TVILBD MAR. 13, 1914.

Fammi-,ed sept. 1,191.42.

z SHEETS-SHEET 1.

Br' l E., MGCABE.

MBTALLURGIGAL FURNACE. v APPLICATION FILED MARIS, 1914. l

Patented Sept. 1, 1914.

2 SHEETS-SHEET 2.

e 7 u I :EDWARD Moonen, or GRANITE CITY, ILLINOIS.

METALLURGICAL FURNALCE.

meager.

Spec: cation of Letters Patent.

Patented Sept. 1,1914.

apeiicauon inea March 1s, 1914. ,serial No. 824,447.

i To all whomz't may concern.'

lib

Be it known that I, EDWARD McCann, citizen of the United States, residing at Granite City inthe county of Madison and State of v Illinois, have invented certain new and useful Improvements in Metallurgical Furnaces, of which the following isa full, clear, and exact description, reference being had to the accompanying drawings, forming a part hereof; '1

My invention has relation` -to improvements in open-hearth and equivalent metallurgical furnaces; and it consists in the novel features of construction more fully set forth in the specification and pointed out in the claims. In the drawings, Figure` 1 is an. end view of a conventional open-hearth. furnace, broken away in parts andshowing my invention applied thereto; Fig. 2 is a side elevation of the lower portion of the air-andgas chamber, parts being broken away and illustrating my invention; Fig. 3 is a horizontal section' on the line 3-8 of Fig. 2; Fig. l is a horizontal sectional detail on the line 4 4 of Figi; Fig. 5 is a top plan of the jack-truck and slag-pot mounted thereon; and Fig. (iis a -side elevation of Fig. 5, with one of the wheels of the truck removed. In the operation of theconventional openhearth furnace a considerable portion of the slag iioating on top of the charge undergoing treatment carries over the edge of the hearth into the flues'or gas passages leading to the chamber communicating with the tunnel which discharges into the stack. This tunnel as well understood in the art is filled with the usual checker-work by which the heat of the outflowing gases is absorbed to be later imparted to the air which supplies the oxygen to the fuel by which the charge is sineltcd. The slag thus overflowing into the chamber aforesaid, in time clogs up the openings of the checker-work of the tunnel at points adjacent the chamber, and in the prevailing practice, a section of the furnace walls must be removed or partially dismantled to gain access to the slag pocket or point of greatest accumulation of the slagA for the purpose of removing these accumulations so as to restore the checkerwork to its original condition; for it 1s obvious that the congealing and hardening of the slag' will in time destroy the eliciency of the checker-work, closing up as it does the passages through which the gases and designed to circulate.

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It istherefo're the object of my `invention to prevent theaccumulation of the slag at lthe point aforesaid, suitable provision being made to4 catch the .slag in suitable pots or receptacles 'as fast as 1t overflows from the hearth,` the receptacles with their charge of accumulated slag being removed.l from time to time, .and the slag dumpedout, after which the rece tacle returned,- ,to catch fresh charges o slag..

Al further object '1S t0 accomplish, desired result without the necessity -of dismantling any portion of theifi;.1.nacifay and without admitting any air whichwonlid have the eiTect of cooling the furnace.

The advantages of the invention will lbe better apparent from a detailed description thereof which is as follows Referring to the drawings, F represents a conventional open-hearth furnacev havin the usual smelting or treatment chamber and hearth H.

In the present embodiment of my invention provision is made to burn oil (crudeoil) in the chamber C, the oil being introduced at opposite sides ofthe furnace t0- gether with a proper proportion of steam (or air or both) through a burner nozzle or pipe 1 inserted through the wall of the'furnace above each end of the hearth. The pipe 1 couples to a T 2 on the outside of the furnace, the arms of the T in turn being coupled to the pipes 3 and 4, respectively leading to suitable sources of oil and steam supply (not shown). The discharge end of the pipe 3 has connected thereto within the T 2 and nozzle l, a tube 5, the portion within the nozzle 1 being spaced from the inner walls of the nozzle, whereby the steam is free to flow through the annular space around the tubey 5 and through the nozzle laand mingle with the oil discharged from the tube, the

two mixing as they emerge from the mouth 100 of the nozzle 1, and burning in the chamber C where they are supplied with the necessary air or oxygen as well understood in the Leading from the treatment chamber at 105 vided with the conventional checker-work 11e.

9. This tunnel is lof the usual type and may be of any length (only a small portion'being illustrated in Fig. 2) yand as well understood in the art, the same discharges into,

"or communicates with, a suitable stack (not shown). In the present embodiment of my invention lthe checker-work 9 terminatesl a suitable distance rearward of the Vrear wall of the chamber 7 (Fig. 2) for a reason to presently appear. -At the bottom of each chamber 7 are built two catch basins 10, 10, separated by a dividing ridge r, the walls of the basins each converging toward a discharge hole or drain opening o which is preferably directly under a flue 6, the center of the opening being in alinement with the axis of the flue., The opening 0 discharges through the roof or crown of an arched chamber or short tunnel 11 beneath the basin 10, access to the chamber being had through an opening in the side wall of the chamber 7 normally closed or sealed by a door D. The crown of the arch of the chamber 11 is lat as shown (Fig. 2) this construction being the most feasible as will presently appear.

Adapted to be run into the tunnel or chamber 11 is a wheeled truck 12 or' any suitable design and construction, the truck being provided with a hollow boss 13 for the reception of a jack-screw 14, the latter terminating at the top in a cluster of arms or al spider 15 adapted to receive and support a bowl or slag-pot 16. The pot 16 is provided with a marginal bead 17 in which is formed an upper groove h for the reception of a suitable quantity of clay m for engagement with the roof of the tunnel 11 around the opening o when the jack with its bowl is screwed tightly against the roof. The j ack is provided with a series of sockets or openings e for receiving in succession the end of a bar or lever by which the jack is screwed or unscrewed.

The operation of the invention is substantially as follows:-During the treatment of a charge on the hearth H, considerable ebullition takes place, the boiling of the charge causing considerable'portions of the slag floating on top or' the molten metal, to iiow over the edges of the hearth inte and down through the iiues 6. This slag in part drops directly into the basin 10, or trickles down along the walls'of the chamber 7 into the basin, whence it is drained through the opening 0 into the pot 16. To properly place the pot 16, the operator deposits the same on the jack 14 (the pot being held by the arms 1,5) spreading `a required amount of clay in the groove 7L, or enough clay to project above the groove. vThe truck 12 with its vjack and slag-pot are then run into the tunnel 11 under the drainopening 0, the jack being screwed down to `allow the slag-pot with its luting of clay the roof of the tunnel. In other words, the

.truck and jack with its pot are tightly jammed between the roof and iioor of the tunnel, after which the door D is closed. The tight joint formed by the clay-band m prevents access of air to the drain opening o and prevents premature congealing of the slag.

In thepresent embodiment of my invention I provide two basins 10 and two slagpots for each chamber 7. It will be noticed (Fig. 2) lthat the edge of the inner basin (the lef-t hand one in Fig. 2) comes beneath the rear wall of the chamber 7, 'and between the plane of saidl wall and the adjacent end of the checker-work 9. This prevents any possibility of slag dripping onto the checker-work, practically all the slag being caught inthe basin. As fast as one pot 16 ills with 4slag, the jack is looscned 'from the tunnel 'roof, the truck is wheeled out, the .slag dumped out,y or the pot withv its sla'g removed, and a fresh pot deposited on the jalck and wheeled into the tunnel. Thus the overflow slag is taken care of by the simple means here shown and the danger of the slag plugging up and choking the interstices of the checker-work 9 does not arise.

It is to bejunderstoodthat the burners 1` are operated alternately, the slag overflow as a result of the ebullition, beingusually on the side of the hearth opposite the burner being operated. Thus in Fig. 1, assuming that the right-hand burner is being operated, the boiling' over takes place on the left, the gases and slag (feathered and plain arrows Fig. 1) traversing the fines 6, 6, the slag being caught in the basins 10, 10, and the gases after leaving thechamber 7 traversing the' checker-work of the ltunnel 8. Of course whenl the right-hand burner 1 is active the checker-work of thc corresponding tunnel or regenerator is traversed by the air which supplies the oxygen to the burner through the fines 6 on that side, the

projection of the fuel from the burner nozzle '1 into the furnace. chamber assisting in drawing in theair through the regenerator. lVhen the left hand burner is active, the reverse of these operations takes place, so that it beconiean easy matter to place the jacks and their slag-pots into position, the basins 10 under the active burner not collecting slag, and the operator having no dripping slag to contend, with. By virtue therefore, of the alternate operation of.l the burners such. Neither do I wish to be limited to the particular means for forcing the slag-pot 16 into sealing engagement with the roof of the tunnel 1l.

claim is l 1. In combination with a furnace prol vided with a hearth, down-take flues positioned in proximity to the hearth, a checkerwork regenerator, a basin into which said liues operate' to discharge'overflow material from the hearth, said basin being spaced from the checker-work and provided with a drain or discharge opening, and a portable slag ot movable into position beneath the opening and adapted to be forced against the bottom of the basin and form therewith a seal around the opening.

2. In combination with a furnace having a treatment chamber and a hearth, a downtake flue leading from said treatment chamber in proximity to the hearth, an air-andgasv chamber in communication with lsaid down-take, a checker-work regenerator leading from the chamber, a basin beneath'the down-take spaced from the checker-Work and provided with a drain opening, a portable pot movable into position beneath the opening and adapted to be forced against the bottom of the basin and form therewith a seal circumscribing said opening.

3. In combination with an open-hearth furnace provided with a treatment chamber and a hearth, down-take flues leading from the chamber in proximity to the hearth, an

air-and-gas chamber communicating with said fines, a checker-work regenerator flua or tunnel leading from the bottom of said air-and-gas chamber, a pair of basins positioned at the bottom of said last mentioned chamber beneath the down-take iiues and v provided with drain openings, a vdividing ridge separating the basins, achamber ortunnel beneath each basin opposite the drain opening thereof, and a portable pot operating in said tunnel and adapted to have its edges brought into forcible engagement with the bottom of the basin and form therewith, a seal surrounding the drain opening of the basin. i

4. In combination with an open hearth furnace having a treatment chamber and a hearth, andprovided w-ith alternately operable burners at opposite sides of the hearth, down-take flues leading from the treatment chamber at opposite sides and in proximity to, the hearth, an air-and-gas chamber communicating with each set of said iiues, a

checker-work regenerator flue leading from the bottom of each air-and-gas chamber, a pair of non-inter -communicating catchbasins at the bottom of the air-and-gas chamber, positioned under the down-take liues and to one side of the terminal ofthe regenerator, a dividing ridge separating the basins, each basin being provided with'a bottom drain-opening, atunnel under each basin commuiiicating with the basin through the drain-opening, the latter penetrating the roof of the tunnel, a portable slag-pot adapted to be positioned beneath the roof of the tunnel beneath the drain. opening and provided with a luting bandI to engage'the roof of the tunnel around the, openin and means for forcing the slag-pot van lute thereof into sealing engagement with .the tunnel roof, the parts operating substantially as, and for the purpose set forth.

In testimony whereof I4 affix my signatlre,

in presence of two Witnesses.

, EDWARD MGCABE.

Witnesses:

EMIL STAREK,

Jos. A. MICHEL.

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