US1680365A

US1680365A - Regenerative open-hearth furnace

Info

Publication number: US1680365A
Application number: US58268A
Authority: US
Inventors: Stewart J Cort; Burns Timothy; Robert S A Dougherty; Charles E Lehr
Original assignee: Individual
Current assignee: Individual
Priority date: 1925-09-24
Filing date: 1925-09-24
Publication date: 1928-08-14
Anticipated expiration: 1945-08-14

Description

LQSSS S. J. CCJRT ET AL REGENERATIVE OPEN HEARTH FURNACE Filed SeptA 24, 1.925 3 Sheets-Sheet l Aug. Mr, w28.

INVENTORS Ya/@f2 Aug M, w28., ll

s. J. com ET AL.

REGENERATIVE OPEN HEARTH FURNACE Filed Sept. 24, 1925 5 Sheets-Sheet 2 m amig@ 25'. SWTTORNEYS S. J. CORT ET AL REGENERATIVE OPEN HEARTH FURNACE Filed Sept. 24, 1925 3 Sheets-Sheet 5 Q20 lIl,

STEWART J. conT, or B ETBLEHEM, rnifmsrnv;

NEW Yonx; AND ROBERT s. A. noUGHEBTY am) HEM, rENNsYLvANLA.

S E. LEER, 0F BETHLE- OPEN-HEABTH FUBNAOE. 1

Application lea September 24, 1925. Serial No. 58,268.

Our invention. relates .toY furnaces, l.and Fig. 9 is a horizontal sectional View taken more particularly to furnaces of the iegenalong the line IX-IX of Fig. 1; erat-ive open hearth type, and it has for an Figs. 10, 11 and 12 are detail views shoW- 55 Object to provide an improved Water cooled ing features of our improved water-cooled liner and damper structure for the purpose throat liner; and,

of. prolonging the life thereof. Figs. 13 and'lll are detail and fragmentary In the construction of open hearth furviews of our improved roof beam structure. naces, it lhas been proposed to provide the Referring now to the accompanying draw-V 60 ends thereof with resilient or monkey walls ings for a better understanding of our indefining converging diverging passages afvention, we show a furnace or melting chamfording communicationbetween the furnace ber, .at 10, which is comprised by the hearth chamber and the gas and air ports. In 11, parallel vside walls 12, converging end .order to better control a furnace ofthis AWalls 13, and an intermediate roof section 65 type, ithas beenJproposed to provide-damp- 14, and end chambers, at 15, comprised by? l5 ers ateach end thereof, a' damper being disbottoms 1.46, converging side Walls 17 and posed at the throat of each oft-he converging roof sections 18.' The

side walls

13 and 17 divergingl passages. Y Owing to the high at each end of the furnace converge in optemperatures -of products of combustion Posite directions and are connected'by the 70 passing through a converging diverging throats 19. V

passage, both the Walls thereof, as,well asY The end chambers 15 serve in a wellits damper, are likely to be burned out. Aol known manuel' as mixing or combustion cordingly, therefore, it isan object of our chambers, gas being supplied thereto by the invention to provide a furnace of this type gas upta e 20 and air being supplied thereto 75 which shall have a water cooled beam strucby the air uptake 21.

`1:11115 extending horizontally `:icl-oss the top The efECVe area, f a tllIOat 19 tffOId-v of the,` furnace and in the region of the ing communication .between the end chamthroat., this Structure being provided with a; bers 15 and the yfurnace Chamber 10 S Varied damper slot, through which is movablewa' 0r controlled by vmeans of a transversely 80 damper having a water-cooled rim, and the lmovable damper "23, which is movable beam structure having secured thereto liners lll'Ollgll all Opening' in the 1 OOf 0f the ful" which are adapted to extend downwardly in nace by a Cable 24 passing over a sheave 25, opposed relation t0 edges gf the damperv and the cable being" COIlleCted t0 any suitable to define Water-cooled sides for the passage. 4Operating mechanism well-known vto those 35 These and other objects are accomplished Y Skilled in the art and constituting no part by our invention as willbe apparent from of our present invention.

the Vfollowing description and the accom- The damper. illustrated iS of a; type Old Pauying drawings, forming a pal-fof this m the art and it preferably comprises a cenapplication, in which: j tralbody .or core of refractory material- 9o Fig. 1 is a fragmentary and longitudinal consisting of brickwork 26 surrounded by a 0 sectional view 0f a ful-'nagev embgdying fea- Water-cooled frame 27, the latter being supturcs of our invention; plied with a perforated tube 28 connected Fig. 2 is a transverse sectional view take to a source of compressed air and serving along theline III- II of Fig. 1; to stir up sediment inthe frame 27. The 95 Fig. 3 is afragmentary plan view of the vframe is connected by

tubes

29 and 30 to a apparatus illustrated in Fig. 1; Y cross bar 31, the latter being attached to the Fig. 4 is a sectionalfview of adamper; cable 24 already referred to. The tubes 29 Fig. 5 is a transverse sectional'view 0f the and 30 also serve as outlet conduits .for the damper rim; rims, such tubes being connected to a com- 100 Fig. 6 isA adetail view of fastening'means mon conduit 32 and the latter communicatso 'for securing the damper hood in place; ing by a khose connection 33V with aconduit 34 liigs.` 7 and 8` are detailviews o f fasteiif leading to the exhaust collectorv 35. The ing means forythe damper hood cover; tuibe 29 has arranged therein a smaller tube duits being 36 which communicateswith a flexible hose-- to 'the supply manifold 39. AEach liner is provided with an outlet 48 at its upper end and the outlets are lconnected to discharge conduits 49, which lead to the exhaust re Vceiver 35. V- y,

The lower ends of the liners 44 are-held Iin place in suitable recesses 50 in the floor fit against shoulders 51 provided at the'side Wallsbef or bottom 16 and preferably tween transverse roof beams 53, to be more particularly hereinafter described. The liners are preferably provided with laterally extending vertical spending vertical grooves in the beams 53. From the structure described, it will be apparent that our improved liners 44 are 'readily removable from the furnace, it being only necessary to-detac-h the conduit connections 47 and 49 and lift the liners upwardly. The pairs of` cooperating -beams 53 delinerdamper entrance spaces 56 for the dampers 23 and serve to support the

roof sections

14 and 18 in a manner to be referred Each of the beam sections 53 is preferably L-'shaped 'for the major portion of the length thereof' and ea'ch section is provided with water cooling conduit openings 57 communicating with the manifold 39 and discharging to the exhaust receiver 35, the conarranged near the surfacesof the beams which define the damper entrance opening and near the bottom sides of the lbeams which are exposed to the heat of the furnace so as to effectively cool the beams `and to oppose burning/out thereof due to the heat of the furnace.

The beams 53 'are opposite and complementary in design so as to provide the damper entrance openings 56 a'nd jopposed vertical slots 55 to receive the jtongues 54 ofthe liners. Outsidev of the liners, the beams are provided with attaching portions V58 which are adapted to be attached by bolts or rivets 59 to opposed buckstays 60. The

beams 53 of a pair Amay furthermore beV secured together by suitable bolts or keys 61.

i 53 are arranged As illustrated, the pairs of beam members to extend transversely of thefurnace above the throat portions 19 thereof, such throat portionsbeingprovided ribs 54' which fit corre.

' openings 72 alPP by opposed reentrant or monkey wallscomprised by the converging

wall portions

13 and 17. The buckstays 60 are arranged exteriorly of the furnace and lit against the outside of the reentrant walls and serve to reinforce the latter. In addition to the buckstays 60, the furnace is alsoequipped with otherbuckstays 63 spaced wider apart for reinforcing the walls of the furnace.

The beam structures, comprised by the pairs of complementary beam members 53 serve to divide' the' furnace roof into a plurality of sections, whereby a section may be removed or repaired without disturbing other sections. -Where the roof of the furnaceis a unitary piece of masonry construction, Yit will be apparent that repairs and replacements cannot be. localized to isolated sections but that the entire roof must generally be replaced. Our transverse beam structure, therefore, affords. a roof construction such that the end sections 18 may be replaced or repaired without affecting the central section 14, and the latter section may be removed or repaired without affecting the end sections. As illustrated, the roof section l18 is inclined slightly downwardly toward the furnace lateral thrust is imposed upon the transverse beam structure. The transverse beam structures, therefore, not only serve to isolatethe roof into a plurality of sections but also serve to support or resist any lateral thrusts incident tothe design of the roof sections. l

In order to minimize theleakage of gases through .the space 56 and around the damper 23, we provide a hood at 65, which extends above the roof of the furnace. and constitutes a pocket or receptacle for enclosing the damper when the latterV is elevated. The hood is preferably comprised byv a metallic shell 66 which embraces refractory material 67, the latter delining a damper ocket or receptacle 68. The shell 66 is provided with flange means 69 at the bottom, the flange means 69 rest-ing on the beams 53 and being preferably secured to the latter by detachable key means 70, such as illustrated in Fig. 6. The key means' referred to may be eomprised by bolts 71 which pass 'through in the beam members 53 and registering openings 7 3` in the flange means 69, the bolts being providedwvithV transverse slots to receive wedge keys 73. From the structure described, 'it will, therefore, be arent that the hoods 65'may be readily attached and detached from the beam structures. f y r The shells 66 are preferably provided with anges 75 near 'the tops upon which lit the top sections7 6, the latter being notched at 77 to receive L`vsliaped ke s 78 li 1n openings 79 in the llangesi 5 and` hel il place by transversely extending wedges 80 as shown in Fig. 8. The cover for the. hood chamber 10, whereby is preferably madein complemental sections in order to provide for its ready attachment and removal. In removing the hood construction, the complemental parts 76 of a cover are first removed, then the damper is elevated up through the opening or pocket 68 and above the hood structure 65, whereupon the keys 70 may be removed and the hood structure taken off.

From the foregoing description, it will be apparent that ve have provided a furnace having reentrant monkey walls with watercooled or heat resisting liners in order t0 protect such. walls at points most likely to burn out. It will also be apparent that we have provided transverse beam structures which are water-cooled, such beam structures serving to define damper entrance openings, to divide the furnace roof into a plurality of sections and to serve as tying means for opposed buckstays 60, the latter cooperating to afford lateral support for the reentrant monkey walls. In addition, it will also be seen that we provide a hood construction for the damper, whereby only openings for the

conduits

29 and 30 must be provided and the leakage of gas around thei damper to the outside is effectively limite While we have shown our invention in but one form, it will be obvious to those skilled in the art that it is not so limited, but is susceptible of various other changes and modifications without departing from the spirit thereof, and we desire, therefore, that only such limitations shall be placed thereupon as are imposed by the prior art or as are specifically set forth in the appended claims.

Having thus described our invention, what we claim,1 as new and desire to secure by Letters Patent is:

1. In a regenerative furnace, in combination, a pair of opposed buckstays, watercooled beams secured to opposite sides of the buckstays, and water-cooled members having key and slot connections with the beams.

2. In a regenerative furnace, in combination, a pair of opposed buckst-ays, spaced water-cooled beams secured to the buckstays and having opposed vertical slots near each end, and water-cooled members havin tongues at their upper ends fitting in the slots.

3. In a regenerative furnace, an arched roof structure comprising two masonry sections and an intermediate section, said intermediate section including a water-cooled horizontal and transverse beam structure, and means maintaining said beam Structure in engagement with one -of said masonry sections in a manner to resist end movement of one masonry section toward the intermediate section.

In a'regenerative furnace, an arched roof structure comprising two masonry sections and an intermediate section, said intermediate section including a water-cooled horizontal and transverse beam structure, and means maintaining said beam structure in engagement with one of said masonry sections in a mannerto resist end movement of one masonry section toward the intermediate section, said means including opposed buckstays at opposite sides of the furnace attached to said transverse beam structure.

In testimony whereof I hereunto affix my signature this 21st day of Sept., 1925.

v STEWART J. CORT.

In testimony whereof I hereunto affix my signature this 4th day of September, 1925.

TIMOTHY BURNS.

In testimony whereof- I hereunto afiix my signature this 21st day of Sept., 1925.

ROBERT S. A. DOUGHERTY.

In testimony whereof I hereunto afiix my signature this 21st day of September, 1925 CHARLES E. LEHR.