US1042047A - Metallurgical furnace. - Google Patents

Description

H. E. SMYTHE. METALLUEGIGAL FURNAGE. APPLICATION FILED mman, 1911.

1,042,047. Patented 001122, 1912.

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H. 5. SMYTHE. METALLURGICAL FUBNACE.

APPLICATION FILED MABLSO, 1911.

l ,042,047. Patented Oct. 22, 1912.

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H'. E. SMYTHE.

METALLURGIGAL FURNAGE.

APPLICATION FILED 141111.30, 1911.

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H. E. SMYTHE.

METALLURGIGAL PURNAGE.

APPLICATION FILED 111111.30, 1911.

1,042,047. v Patented oC1.22,1912.

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W/TNESSES; JNVENTOR.

ATTORNEY.

ra'rnnr carica HORACE E. SIVIYTI-IE, F PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO THE S. E. SMYTIIE CGMPANY, F PITTSBURGH, PENNSYLVANIA, A CORPORATION 0F 'WEST VIRGINIA..

METALLURGICAL FURNCE.

Patented @ein 22, IMQ.

Application led March 30, 1911. Serial No. 617,963.

To all whom it may concern:

-Be it known that I, HORACE E. SYMTHE, a. citizen of the United States, residing at Pittsburgh, in 'the county of Allegheny and State of Pennsylvania, have invent-ed new and useful Improvements in Metallurgical Furnaces, of which the following 1s a specification.

My invention relates to improvements in furnaces, and has especial reference to furu naces of the regenerative type, tho-ugh portions thereof are applicable to furnaces of other types.

The object of this invention is the removal of the dust, fluxes, metallic substances, and the like from the waste gases issuing from the furnace chamber prior to the down-pass of the said gases through the checkerwork of regenerative chambers. Heretofore, the waste gases laden with dust, HuXes, and the like passed by down-draft through the checkeru-'ork causing the dust, fluxes, and the like te 'be deposited on the top of the checkers. The high temperature of the burned gases or waste heat fuses the said dust, fluxes, and the like, which percolate over and through the checkers and harden thereon, nally closing the checker-L wolk passages entirely or to such an extent as to stop or interfere with the passage of the air, gas, and waste gases through the saine.

Fuller explanations of the objects of this invention will be given herein after I have described the details thereof. c

Referring to the drawings which illustrate only one set of regenerators and the passages and chamber between the same and the furnace ports, the furnace chamber, lstack, and reversing valves being omitted, Figure l is a horizontal section of Fig. 6 on the line I-I. Figs. 2 and $3 are vertical sections of Fig. l on the lines II-II, and III-III,respectively. Figs. d and 5 are ,vertical sections of Fig. 6 on the lines chamber have heated gas and air passing'I through one set of hot regenerators or checlteiu'orl; chambers into onerend of lthe furnace. chan'xhcr. where they connningle and burn. The products of combustion pass out of the remaining end of the furnace chainber and through the remaining set of regenerators at or above the said end of the furnace chamber, thereby raisin-g the cheekerwork to a high temperature. After the latter checkerwork has been highly heated, the first-named eheckerwork having become more or less cooled by the air and gas in their passage to the furnace chamber, the course of the air and gas, and of the waste gases are reversed by the operation of certain Well known valves so that the air and gas will be heated by the checkerwork which was heated by the waste gases, and the cooled checkerwork will be heated by the Waste gases. l

As all the structure so far described is old and well-known I have omitted the furnace chambers and the regenerative chambers and passages at the left-hand thereof. 'Ihe usual reversing valves, the stack, andthe various ports and passages have also been omitted. My description will, therefore, be mainly conned to one set of regenerators and the various ports and passages between it and the furnace ports. 1 y On the drawings, which do not exhaust the various forms which my invention may take, I represent by the numeral It vertical furnace ports or passages'which lead from the slag pocket or chamber 2 at their lower end to the furnace chamber (not shown). Une end ofthe slagpocket 2 communicates by the'port 3 with the upper end of the down-draft dust-collecting chamber 4t having at its lower end and in the wall opposite that in which the port 3 is located, the port 5. The port 5 opens int-o the bottoni of the up-draft or auxiliary eheckerwork chamber 6 separated from the down-draft or main checkerwork or regenerator cham ber 7 by the wall 8 above whose upper end there is a free communication between the upper ends of the chambers 6 and 7. Be-

neath the checkerwork in the chamber 7 are the longitudinal passages 8 which lead .to the stack port 9.

By reference to Figs. 5 and 6, it will be noted that the slag-pockets are very shallow asl compared with the usual slag-pockets, which reach to a level as low as that represented by the bottom of the chambers 4, 6, and 7. I line the bottom of the slag-pocket with silica sand or other refractory material i0, having its surface slope towardxthe outer side il', asshown onFig. 5, so that the molten slag will run toward the outer side andv through the openings 12 and thence through the s outs 13 assoc1ated with the respective openmgs 12. The bottom of the slag-pocket has its end portionsv inclined upwardly and .mally sealed with coke, as shown in Figs. 2` and 5, is broken away with a bar, permittmg the molten slag to run out. When the slag runs out so as to open the pockets to the air, the opening 12 is again plugged with coke or similar material. The slag-pocket 2 is provided with the doors' 14 which close openings l5 in the side 11, so that the doors may be opened and tools or apparatus introduced through theopenings 15 to clean the pocket of the more solid or dense fluxes while the furnace is in operation. lt is not necessary to stop the furnace to clean out the slag-pocket, since the slag can be drawn olf from Atime to time through the openings 12 and the process assisted and the more solid materials removed by the aid of tools through the openings 15. Heretofore it has been the practice to make the slag-pocket'very deep,

as before stated, the slag being allowed to accumulate until it became necessary to shut down the furnace and remove the slag. The

solid slag is very difficult toget out, it being common to tear out the sides of the pocket to get at the slag, which though exposed is exceedingly hard to remove. It will be seen that the removal of the solid slag is a .very slow and expensive process, to say nothing of the loss due to the idleness of the furnace. My slag-pocket 2 is so shallow that its first cost is small and it is not necessary to destroy it to remove the slag, as .the slag is always hot and in a cbndition to be removed as desired. The astefurnace gases, after entering the slagocket, where the deposit the greater portion offtheir slag fan heavy impurities, pass down the dust collecting-chamber 4;, at the bottom of which I place the opening 16, provided wit-h the door 17, so that access may be had to the chamber l for cleaning out the slag, dust, and other deposits therein and| for other purposes. Itis 'not necessary to interrupt the operation of the furnace to clean out the chamber 4. The waste gases then turn and pass through the port 5 into the comparatlvely open bottom portion of the chamber 6, t is openings 18, having the doors 19. Except for the said lower portion and the upper portion of the chamber 6, the latter is occu- ,chamber 4 actin portion being provided with the side site the doors 19, which may be opened at intervals to permit the removal of the slagy and other impurit-ies. The reversal of the draft in the passage l` also causes the slag and dust therein to be carried to the bottom of the said passage, the checkerwork in the as a filter or scrubbery and preventing foreign matter from passing through the checkers or regenerators, keeping the same always free, thereby increasingv the output of the furnace, effecting a saving of fuel, and'prolonging the life of the furnace. When the waste gases pass over the wall 8, they are practically free from slag and dust. Heretofore the waste gases from the slag-pocket have passed horizontally and then downwardly with their burden of slag through the checkerwork of the regenerator chambers, the slag being deposited on the top ofthe checkerwork and in the passages between the bricks until the passages became so clogged that the furnaces had to be shut down. The slag hardens and cements the bricks together so that a very large proportion of them must be destroyed in taking I down the checkerwork. In my invention, the slag and dust are nearly all removed before the waste gases reach the chamber 7, so

that there-'are small or no deposits of slag or dust on or in the checkerwork.

So `far I have described only the air lpas- I Accordingly, correi The wall 20 is common to the chamber to receive the waste products susl pended in the lburned furnace gases which pass beyond the slag-pocket, and means for the removal of such suspended products while the furnace is operating normally or while the furnace is hot.

2. In a furnace structure, an auxiliary checker-chamber and a passage leading from the auxiliary checker chamber to the furnace, a main checker-chamber, communicate ing with each other at `the top, the bottom K of the auxiliary chamber being in communinace is operating normally orA While the fur- 10 cation with the passage leading to the furnace isv hot.

nace .chamber and the bottom of the main Signed atPittsburgh, Pa., thls 28th day chamber having a port serving alternately of March, 1911.1

' as an outlet for the Waste gases and an inleJ HORACE Eo SMYTHE for. one of the gases to be burned, and means for the removal of the deposits below the Witnesses: auxiliary checker-chamber and for the F. N. BARBER, cleaning of tliegsaid chamber While the ur- ALICEE. DUFF.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washngtom'D. G.

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