US936930A - Regenerative furnace. - Google Patents

Description

HWV/ 2/ A Patented Oct, 12,1909.

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J. B. McKENNAN.

I REGENERATIVB FURNACE.

APPLICATION FILED MAR. 7, 1908 Wild wows J. B. MoKENNAN.

REGENBRATIVE FURNACE.

APPLICATION rum) MAB. 1, 190a.

Patented. 0613. 12 1909.

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J. B. MoKBNNAN.

RBGBNERATIVE FURNACE.

APPLICATION FILED MARJ, 1908.

q vi/hwooeo Patented Oct. 12,1909.

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l5, sla.g,-pockets or regenerator fines and the To all My 7 umrnn masm m O FICE.

. mess nijncxnnnnn, QFPUEBLO, COLORADO.

nnennnna'rrvazrmwaen i Specification of LettersjPatent. liateiited' Oct. 12, 1909.

. ,Q; Application marijuana. 7,19,08, Seria1'No.419, 690J- I Be i-t-known that I, JACOB B, MoKmvnnn, a citizen of the United" States; residing at. Pueblo, in the county of Pueblo, and State of Colorado, have invented certain new and useful-Improvements in Regenerative Fur- Y naces, of which-the -ution. fi

: a .My inventionyrelatesto metallurgical furfollowin-g. a specificanaees, more particularly; to regenerative furvia te.the gradual, destruction by fusion of the ports and uptakes, the falling of fllhell fused liningsinto the furnace or into'the :frequent and expensive repairs-necessitated thereby; and to secure a furnace in which the points of admission and thedirection of. flow. of thefuel and airintothe furnace and the, points of exit and the direction of the.

flow of thejproducts offcombustion out" of the furnace, may be definitely established and inaintained consta'nt fromthe time the furnace 1s first put in operation, as long'as desrredib I attain these objects by the constructionshown in accompanying drawhalf I of'a' refgeneraitiv fi'iinal'ce of standard construction", Fig! 2 a -longitudinal vertical section through a furnace, itsslag- :pocketsand uptakes, showing my invention ""appliedth'eretoig. 3'is a half plan of the furnace with'one' set ofregenerators, pOrt 1ons"be1ng shown-1n :s'ect1on;Fiq.- fl: is a horizontal section on'gtheplane Il -IV of "Fig'.,2'; Fig. 5 vertical-section on the tion ofkthe' arrows;iFig. 6 is a partial plan t. isa section on Heretofore, *PBgGllBI'iltlVe furnaces, their ports, flues and;combustion-chambers have been constructed-of or lined with refractory material; Despite therefractory character of thesewalls, they are raduallyfused in the high temperatures reveloped causing the walls to wasteaway into the furnace or into the uptakesor slag-pockets and the port ends tocut back-under the flow of t-he heated gases, particularly the outgoing products of combust1on;.so that in ordinary furnace construction the points of admissionanddirection of flow of the incoming gases-areuncerexcept" when" the" furnace v newly repaired.- On account of this comconsi is new or 'paratively, rapid destruction of the refracytorywalls, it is anotuncommon practice to make then/fall's of the ports rather longer, and the openings more constricted at the furnace ends, than is; consistent with the maxilla-mu efliciency of operation. Therefore, a new furnace, or one newly repalred, doessnot Work as rapidly or as efliciently as it does after some fusing or cutting has taken plac'e in the passages. However, after this fusing has progressed beyond a certain degree, the efiicien'cy then begins todecrease by reaso'nfof the fact that the ases can no longer be directed upon the bath to the best advantage. Such'construction is illustrated in '1. A further disadvantage of such compromise/construction is that the furnace erable period.

In my improved.- construction, I nearly or entirely clispensewith' refractory walls for the furnace-ends and the gas and alr-ports and uptakes; substituting for the port and uptake walls metal "conduits, preferably water-cooled or water-jacketed, and providing at the furnace-ends metal breastplates which have, preferably, a comparai"tively light lining of refractory material,

which is accessible to repair through the .iiurnacedoors-while the-furnace is in opera- "tion. a

In the drawings, '1 and 2 are, respectively,

4 the uptakes 5, 5, 5 the water-cooled con- (luits or ports, (ibreast-plates, and 7 the furnace chamber.

' l The preferred conduits of my construction are -(louble-walled and entirely of metal; such as iron, steel, copper or bronze, each having provision for circulating water between the inner and outer walls, and preferably provided with a water-seal or mudjoint 8 at the top of the uptake, (as shown at the left of Fig. 2), or ust above or arranged to replace the arches of the slag; pockets, (asshown at 9. at the right of the same figure). The breast-plates 6 are also of metal, preferably of plates, suitablyspaced by separating members 10, at their outer edges, and by rings 11, at the points of entrance of the ports. The thin lining 12, of refractory vmaterial is provided as a par tial protection for the flat breast-plates performance is never uniform for anyto facilitate the opening, examination and repair of the ports. This sectional construction also minimizes the efiect of the strains and distortiondue to temperature changes and permits the variation of direction of gas and air in the furnace by the substitution of'a single inner or upper sec tion, instead of an entire port. As is usual,

the'single gas-port is locatedbetween and somewhat lower than the air ports to effect the better-mixture and promote the combustion of the fuel. With these provisions for controlling and directing the flow of air and gas, it will be noted that I can entirely dispense with the usual combustion chambers; the ports discharging directly into the furnace chamber but a few feet from the edge of the bath. Moreover, the deflecting or reverberatory roof may be dispensed with, as well; both changes securing considerable economies in first cost.

The arrangement of the converging and downwardly inclined deflecting ports, shown in plan in Fig. in end elevation in Fig. 5 and inv sectional side elevation in Figs. 2 and 7, illustrates the manner in which the air andfuel may be concentrated upon or directed toward any desired part of the hearth; and whenonce thus directed, it will be maintained there; because no fusing or cutting back can occur at the discharge ends of the ports to dissipate or. deflect the incoming currents. I

The general arrangement. of tines and re generators shown is a common one in furnaces of this type, and my improved port construction can be readily applied to existing furnaces; but I do not intend to limit myself to the arrangement.- shown; as it is evident that my construction readily lends itself to the introduction of the gas and air at any other point of the furnace chamber WlllCh may be found desirable.

V d l a lhe advantages of my invention result from the lower first cost, increased durabilit-y, ease of repairs, and certainty of opera- I tion; but principally from the uniformity of working, at a maximum efficiency, for

-much longer periods than in furnaces of ordinary construction.

I am aware that furnaces have been pro: vided w1th movable ports of refractory material. some of which have been provided with partial water-jackets; but such constructions in no degree obviate the ultimate destruction of the lining, which results in the clogging of the uptakes and dispersion or deflection of the incoming currents.

I am also aware that water-cooled metal twyers have been used in blast-furnace practice: but such twjvers have no deflecting action, are not subjected to the high heat of outtiowing gases upon reversal and are not made sectional, for purposes similar to those above set forth.

What I claim is V 1. A. regenerative furnace having metal ports provided with a smooth and even interior contour and deflected in such a mannc' as to direct the air and gas upon the bath at any desired point I .2. A regenerative furnace having watercooled metal cud walls and water-cooled metal deflecting ports entering through said. walls. I i

3. A port construction for regenerative reversing furnaces, composed wholly of metal, and having means for circulating cooling fluid about said port.

4. A c'louble-walled port for regenerative reversing furnaces, composed wholly of metal, and having means for circulating cooling iluid between said walls.

5. A deflecting double-walled port for re.

posed wholly of metal and having'means for circulating a cooling fluidabout Saidsec'tibii to protect it from the heat of thefurnace.

7. A double-walled, sectional metal port for regenerative reversing furnaces, said sections each having interfitting ends, and means for circulating water between. the

.walls of said sections.

8. A furnace having converging ports opening directly. into the furnace chamber; said ports being composed wholly of metal, having double walls, and being provided with. means for circulating water between said walls whereby the direction of the fuel and air supplies may be maintained constant within the furnace chamber.

9. A furnace having water-cooled breastwalls and sectional, metal portsentering through said breast walls.

10. A furnace having water-cooled breastwalls, said walls having a comparatively thin coating of refractory material; in combination with double-walled, water-cooled metallic deflecting-ports entering directly breast-walls.

11.. A metallic port for a regenerative reversing furnace, composed of metal sections.

12. A sectional metallic port for a regenerative reversing fnrnace, each of said sections having a: periphery coincident with the periphery of the-port.

13. A sectional metallic port for a regenerative reversing furnace, each of said sections having a. periphery coincident with'the periphery of the port, and having means for circulating a cooling fluid about the Walls of said section.

14. A deflecting, double walled, watercooied metallic port. for regenerative reversing furnaces.

15. A sectional, deflecting, double-walled, water-cooled metallic port for regenerative furnaces, the metal walls of tlie port-sections enchhm'ing a periphery coincident with the periphery of the port.

16. A metallic port for a regenerative, re-

versing furnace composed of metal sections 20 JACOB B. MCKENNAN.

\Vitnesses Jomv G. HINKEL, W. I). GnoEsBEcK.

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