USRE12939E - Fttbnace - Google Patents

Description

IE-SHEET 1.

llllllllllllllllllllllllll lllllll 1r AGE. 1'11) FEB. B, 1909.

T. S. BLAIR, Jn.

PURN

APPLICATION PIL llllllllllllllllllllllllllllllllllllllllllllll f k mMMM:

i a v 1 Km wu 4 Reissued Apr. 13, 1909.

T. S. BLAIR, Jn.

FURNAGE. APPLIGATION FILED F133. 8, 1909. Reissued Apr. 13,1909; I 12,939.

4 SHEETS-SHEET 2.

T. S. BLAIR, h. FURNACE.

APPLICATION FILED FEB. 8, 1909.

Reissued Apr. 13, 1909. 12,939.

4 SHEETS-SHEET 3.

T. S. BLAIR, JR;

FURNACE.

APPLICATION FILED P318, 1909.

If!!!IllJ II IIII!I!II IIIIlIIIIIIIIIIlI/ M Reissued Apr. 13, 1909.

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3 \n \w hm N 4 I ,z amm; I v (31W figs? No. sameness-mm am U ITED STATES PATE T OFFICE.

TIIQMAS s. BLAIR, JR, or ,ELMHURST, ILLINOIS, ASSIGNOR TO THE BLAIR PORT COMPANY,

.OF .NEW YORK, N. Y., CORPORATIO} OF NEW YORK.

FURNACE.

I Specification of ReissuedLetters Patent. Reissued April 13, 1909.

Serial No. 369,411. Application tor reissue filed February 8,1909.

aerial No. 476,859.

may concern:

To all whom it j Be it known that I, Tnoams S. BLAIR, J r.,

. a citizen of the -United States, residing at Ehnhurst, in thecounty of Dupage and State of Illinois, have'invented a new and useful Improvement in Furnaces, of which the followingis a specification.

My invention relates to improvements in the class of reverberatory furnaces ofthe regenerative type employed for melting or heating steel and known as an open-hearth furnace, when adapted for melting, and as l a heating-furnace when adapted for heating blooms, billets and ingots.

In this class of furnace the intense heat to which the port-arch, of refractory brick, is, subjected soon destroys it, and the same destructive influence is exerted on the rear brick wall of the gas-port; and the destruction of either of these features of the fur they enter the furnace-chamber proper, to

reverberate therein, thereby to add to the life of the arch by supplying anextension thereof to be worn awa in a backward direction by the heat unti the resultant shortening of the arch renders it unfit for its purpose; and it is furthermore the practice to provide under the forward-end portion of this extended section of the arch a system of water-circulating pipes to the end ofcounteracting the injurious eflect upon it of the intense heat. The practice. isnot effective for the purpose, however, inasmuch as the point below the arch where the greatest intensity of heat of the burning gases isexerted is short of the extended section and of the water-pipes with which it is equipped, so that the heat, instead, as intended, of wearing away the arch from its forward end backward, soon breaks through it behind the pipes, thereby destroying it almost as soon as though it. were unprovided with any means of protection.- To overcome this tendency to arch-destruction, I- substitute.

for the arch in the furnace a straight hood I which abuts. against the inner surface. of th "to extend over the port, forming it hollow of metal, and equip It with means for clrcuprotects it against injury from the heat; and to counteract the destructive tendency of the heat upon the rear wall of the port, I construct that wall of metal-and provide means for flowing water over its outer surpurpose being preferably the outflow from the hood.

is a longitudinal vertical section .of one of the two similarport-containing end-portions of a furnace equipped with my improvements, the'section being taken at the line 1 on Fig.- 2 and viewed in the direction of the arrow; Fig. 2 is a view of the same in end-elevation partly sectional, the section being taken at the line 2-on Fig. 1 and viewed in the direction of the arrow; Fig. 3, a section taken at the line 3 on Fig. 1 and viewed in the direction of the arrow; Fig. 4, a section taken at the line 4 on Fig. 1 and Viewed in the direcat the line 5 on Fig. '1 and viewed inthe direction of the arrow.

p The construction of the furnace, except as to the features constituting my im rovements, may be the same in all particu ars as that of the furnace of the same type in common use, so that there is no need of describing it in detailin the present case. In each end of the furnace-.chamberfi is formed the passage when the direction of the gases through the furnaceis reversed, asfwill be understood by those skilled in the art. Through the end-Wall 9 my improved device for covering the port 7, and which for lack of a: better name I term a hood, to distinguish itfrom the usual arch but which jects inclinedly into the furnace, wherein its Inner end is supported by the wall-sections 10. This hood, denoted as 11, is a hollow metal body-preferably constructed of steel plate, similar to a boiler-shell, though itmay flat top, bottom and sides with.a rounde inner end, and formed with an upright tion of the arrow, and Fig. 5, a section taken performs every function of the latter, probe a-casting of iron, steel or bronze havin l-ating water through it, which effectively face, the supply of water for this last-named In the accompanyingdrawings- Figure 1 gas-port 7 leading from a vertical uptakepassage 8 which becomes the downtakechamber or head-section 12 on its outer end,

wall 9. In the top of the head 12 is provided a vent-op'enin 13 covered bya shield l4iltotend to exclu e foreign matter from enter- "ing the hood through the vent. On the head ends, these pipes 'bein 12, near its base, is secured armanifold 15, from which a plurality of waterspi'pes 16 ex-' tend. into the hood nearly to its inner end,

.wherein they discharge'through theiropen' spported bye spider 17 in the hood. A va v water-supply-pipe 18, leading from a: suitable source (not' 1Sh0WI1) connects with one-endofthe header I 15 to flowwater from the latter, through the pipes 16 into the hood 11, through which it is caused to circulateby overflowing through a dischargeipe 19. leading'fromthe upper part of thee amber'1-2.' By thus circulating water through the 'port-coveIin'g-..hood it is preserved against rapid" destruction and when it is finally worn'its removal and replacementby a perfectbnei are jmatters of comparative ease, requirin little; time and therefore incurring-only a 1; mt interruption in'the operation furnace. i

The port-wall 20, or; bulkhead-Z, instead of being constructed-of fire-brick, 'asusual, is formed of metal, preferably in two sections, as shownnthen per secti'on'21 being narrower, vertica1ly, t an the lower section 22 to register .withgsthe .\port"7 and being adapted to be readily removed to permit ac.

- cess to the base of the ,.port for truing up or repairing it, an "operation requiriii'g to be performed occasionally, and, which is ve arduous and expensive with the old construe .tion of furnace, wherein the wall 20'is of channel-plates to leave discharge-openings 24: adjacent to said backs. With the troughs are provided alternate shelves 25,'inclin1ng. upwardly from the back'of each section of the wall 20 and extending between 'the sides thereof, to form water-receptacles adapted to overflow from one into theother through the troughsv23. These sections of the wall 20 are removably fastenedin place, as "bybars 26 caused to bear against the upturned ends of the troughs by being inserted through open-.. xing's 27 formed horizontally through the endwall sections of-brickjbetween which the sections of the'metal wall fitlan'dare confined.

Water'is supplied to flow over the outer surface of the :wall .20 by running the overflow from the'h'oo'd 121by wayof the pipe 19 through. a -'..va1ved1branch 28 to the section 21 to e uppermostreceptacle-forming shelf 25, whence theove'rflowruns through the adjacent trough 23 filling the next lower rece taclejfromfwhich it overflows, and so "on own'to the base of the wall 20, which 'is' formed into'a receptacle 29, whence the 'water discharges through a pipe-.30 leading to a sewer- 01 other desired point. Thus the water is caused toflowand be distributed heat in the furnace when the ot gases are directed against iain'passing'from the port 7 into the passage 8, thenconstituting the port-downtake. I also provide, by prefer- ;-ence, another branch 31" of the pipe 19, to lead the water directly-to the lower wallsection'22, to increase the 'flow, or rather to supply-it to' that section while the upper section may be removed temporarily, when the branch 28 would also be removed. l -As is usual i furnaces of the class to which my invention relates, the air for com-' mingling with the'gases-entersthe furnacechamber throughjopenings '32 formed above the plane of the arch, or,'i-n the present case, thehood 11 in the end-wall. For illustrating myinvention it is only required to show be understood, itis intended hat the opposite' end-portion shall be" similarly constructed and equipped-,with my improvements'. By the construction thus. shown and described a practically indestructible port is provided. --1n an qpen-hearthmelting furnace, the blocks or ends of the furnace, are built up-to the level at which, under the usual construction, the port-arches are placed -of silica brick in acid-lined fur- -naces,and of magnesite brick in basic furnaces. These blocks are covered with my water-cooled hoods, in place of the brickarches, and they may be kept in shape permanently by throwing silica sand in an acidproper proportions offbasic slag, in abasic furnace, against them from time to time during the operation of the furnace, in the same manner that the breasts or sides of the furnace-linings are nowkept up in the common practice. only render the ports of theffurnace indestructible, but, by enabling the ports to be kept in their original condition, proper combustion. of the gases-is; assured during the entire life of the furnace, and, consequently, greatly increased life is afforded to the roof and side-walls, any of which may be readily replaced when required during the usual burning out of the flues at the end of each week This same statement of advantages applies equally to heating furnaces, which, however, arealways acid-llned.

What I claim as newlgand desire to secure by Letters Patent is-- l over the outer surface of themetal wall, to counteract the injurious ten ency of the i My improvements not one'end-portion of the furnace' but, as Wlll furnace, and ground magnesite mixed with ,1. In a reverberatory regenerative furnace, thecombmation with a gas-port, of a hollow a hollow metal body metal hood forming the entire port coverin and means for circulating water throng said. hood, for the purpose set forth.

2. In a reverberatory regenerative furnace, rojecting into. the furnace from its end-wall to extend over the gas-port and be exposed directly to the heat of the furnace, and means for cooling said body, for'the purpose set forth.

a hollow metal body supported in the furnace-ehamber to extend over and entirely .cover the gas-port and provided with an outlet, and means for directing cooling water into the inner-end portion of said body to circulate through 1t, for the purpose set forth. 7

4. Ina reverberatory regenerative furnace, a hollow metal hood :projecting into the furnace from its end-wall to extend over the gas-port, and means for cooling said hood, for the urpose set forth.

5. In a rever eratory regenerative furnace, a hollow metal hood projecting into the furnace-chamber over the gas-port from its end-wall and extendingto its side-walls, and

- means for cooling said hoo'd, for the purpose the hood through the same to said'outlet, for the par-- pose set forth.

.sct forth.

(L'In a re verberatory regenerative furnace, a hollow metal hood inclining downwardly into the furnace from its end-wall to extend over the gas-port, and means for coolingsaid hood, for the purpose set forth.

7. -In a reverberatory regenerative .fur' nace, a hollow metal hood projecting into the furnace from its end-wall to extend over the gasportand, provided with an outlet, and means for directing a cooling-medium into the inner-end portion of the hood to circulate through it, for the purpose st forth. d v

8. In a. reverberatory regenerative .furnace, a hollow metal hood projecting into the furnace chamber from its end-wall to extend over the gas-port al id provided with an outlet, and a water-conducting pipe discharging into said hood, for the purpose set forth.

9. In a reverb'eratory regenerative furnace, a hollow metal hood projecting intothe furnacefcha'mber from its end-wall to extend over the gas-port and provided with an outlet, and a water-conducting pipe dis-,

charging-into the inner-end portion of the hood, for the pur ose set forth.

j 10. In a rever eratory regenerative furuacq a hollow metal hood projecting into the furnace-chamber from its end-wall to extend over the gas-port and provided with a water-outlet, and a water-conducting pipe discharging into the inner-curl ortion: of' for circulating coolingwater 11, In a reverberatory'regenerative fur- 3. In a reverberatory regenerative furnace,

nace, a hollow metal hood .projectinginto the furnace-chamber from its end'wali to extend over the gas-port and provided with a water-outlet in its rear portion, and waterconducting pipes discharging into the innerend portion of the hood for circulating cooling-water throughth-e same to said out-.

let, for the purpose set forth.

12. In a reverberatory regenerative furnace, the combination with the gas-port, of

a hollow metal hood forming the entire port covering, said hood being provided with a water-outlet in its end, and a Water-conducting pipe extending. within said hood and discharging at its inner end'therein, for the purpose set forth. I

13. In a reverberatory regenerative'furnace, the combination with the gas-port, of

ahollow metal hood forming the entire port covering, said hood being providedat its outer end witha chamber-forming head having a discharge out-let, a manifold having a water-supply pipe connected with it, and water-pipes extending from the manifold in the hood and discharging therein, for the purpose set forth. I

14:. In a reve'rberatory regenerative fur= nace, the combination with the gas-port, of a hollow metal hood forming the entire port covering, said hood extending through the end-wall of the structure into and supported in the furnace-chamber and providediat its outer end with a chamber-forming ventedhead having a discharge-outlet, a manifold on said head having a water-supply pipe connected with it, and water-pi es extending from the manifold lengthwise into the hood nearly to and discharging into its inner end, for the purpose set forth.-

' 15. In a 'reverberatory regenerative furnace, the combination with the gasort, of

the adjacent portion of the end-wal of the structure formed of metal and provided with means for flowing water over its outer surface and operating to protect said wall against the effect of the heat of the outgoing products of combustion, for the purpose set forth.

16. In a reverberatory regenerative furnace, the combination with the gas-port and the downtake-passa ecommunicating there- ,with, of the end-wa lcovering said port and ,passage, formed of metal and provided with means for flowing water over its outer surface and operating to protect said end-wall against the effect of the heat of the out-going products of combustion, for the purpose set forth.

17. In a reverberatory regenerative furnace, the combination with. the gas-port and the down-take passa e communicating therewith, of the end-walcovering said port-and passage, formed .of upper and lower metal sections and provided with means for flow ing water over its outer surface and operatflowing water oversaid surface through said 'mg to protect said end wall against the effect of the heat of the outgoing products of combustion, for the purpose set forth.

18. In a reverberator nace, the combination with the gas-port and the downtake-passage communicating therewith, of the end-wall covering said port and passage, formed of metal and provided on its outer surface with Water-distributing means, and means for flowing water over said surface and operating to protect said end wall against the effect of the heat of the outgoing products of combustion, for the purpose set forth.

19. In a reverberatory regenerative fur-' nace, the combination with the gas-port and the downtake-passage communicating there with, of the end-Wallcovering said portandpassage, formed of inetalin channel-shape and fitting and confined between brick-sections of the end-wall of the-structure, said wall having series of water receptacles and troughs on'its outer surface, and means for troughs and receptacles and operating to regenerative furprotect said Walls againstthe effect of the heat of the outgoing products of combustion, for-the purpose set forth.

1-20. In a reverberatory regenerative furnace, the combination with thegas-port and the downtake passage communicating there? with, of therend-wallcovering said port and passage, formed of metaland provided on its "outer surface with water-distributing means said coverin o eratin to rotect said wall against the effect of the heat of the outgoingproducts of combustion, a hollow metal hood'forming the entireport covering extending through the end-wall of the structure' above said-metal wall into and supported in thefumace chamber and having a water-outletin its outer end and a Waterconducting pipe in and discharging within it, and a discharge-pipe leading from said outlet to said water-distributing means on the metal wall, for the purpose set forth.

a p I THOMAS S. BLAIR, JR. In presence of- A. U. THORIEN, R. A. SCHAEFER.

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