US3156218A

US3156218A - braun

Info

Publication number: US3156218A
Authority: US
Publication date: 1964-11-10
Anticipated expiration: 1981-11-10

Description

Nov. l0, 1964 o. l.. BRAUN 3,156,218

FORCED CIRCULATION WATER-COOLED FURNACE DOOR Filed Oct. 2. 1961 MUNI im# INVENTOR.

OTW/N L. BRAUN www A TTORNE YS United States Patent Oifce 3,156,2l8 Patented Nov. 10, 1964 Ottnln l.. llrnun. l'lthhurph. l'n., nsslzznnr to Reliance Steel Products Company` hiclecsport, la., n corporation ol' Pennsylvania Filed Oct. 2, i961. Ser. No. 141,371 2 Clnlmfl (Cl. 122-498) This Invention relates to a forced circulation watercooled furnace door nnd. more particularly. to a furnace door having structural members which both .ftrengthen and serve as fluid conduits to'cool the door.

Open-hearth furnace doors arc generally exposed to the intense heat of the furnace combustion zone. and to teuer withstand the high temperature exposure a refractory linlng is positioned on the door inner face. lt has l-een found nccenary ln order to prevent heat destruction of the lining to cool the door and lts lining ly circulating water between the metal portion of the door. which anrmally is provided with an integral reservoir. and the lining. Studs or tubes are embedded within the refractory material. and water ls circulated through these tubes to and from the reservoir ln the metal or main body por tlnn of the door. 'l'hcse tubes are fastened to the door main body portion in such a manner that th: tulcs anchor the refractory lining onto the door inner face.

llcretofore. the refractory lined. water-cooled doors had a useful life which was seriously limited hecause of the incfllcieney of the door cooling system. That is. thi.` water contained within the main body portion and the tuhes within the refractory lining rapidly become heated to an elevated temperature. Circulating this heated water between the jacket or reservoir and within the tubes failed to maintain the temperature of the refractory material and the door metal to the low level or decree required to eliminate the destruction of the materials comprising the door.

ln my copending npplleation Serial No. 142.276 for a Forced Circulation Water-Coolcd Door. filed October' 2.

i96l, which is assigned tn the assignee of the instant application. there is provided n plurality of tubes which lock the lining in position on a furnncc door. and which form n part of n forced circulation water-cooling system. Water' is introduced into the door under pressure. and n constant volume of cool water ls forced through the doorcooling system. The water ls continuously forced out of the door nl n rnle of flow which maintains the temperature of the water within n designed range. As a result of the forced circulation of water in the novel door cool ing system. thr.` service life of the door ls prolonged for a period exceeding that of the prior nrt doors.

This invention utilizes the forced circulation principle for cooling n furnace door much the same as that dis closed and claimed in my above-cited copcnding application. The general nature of the opcn-hcarth furnace door is well known to include an inner and an outer facc which nre in parallel spaced relationship. The marginal portions of both door faces are flanged. with the inner face flange being iaturned to form a supporting surface for a refractory lining which is cast in situ on the door inner face. Tite flanges nrc joined together at their edges with one flange being directed toward the other such that thc flanges on the faces of the door are spaced apart to Iitl form a water jackct or reservoir. Tubes. hollow studs` or other conduit members extend from the door inner face into the lining and hold it in place on thc door inner face. The door jacket and tubes are filled with water. and in the` known doors. the water is circulated hy convection current to and from-the jacket through the tubes.

An object ofthe present invention is to provide n forced circulation water-cooled furnace door having n monolithic refractory lining secured on the door inner face hy emlcdded hollow keys arranged on the door to furnish maximum support for the lining.

Another object is the provision of a watercooling system for a furnace door having hollow elements which support a refractory lining on the door a'rd which are designed to conduct water under pressure through the system to achieve maximum cooling eflciency.

A forced circulation water-cooled furnace door illustrating certain features of the present invention may in clude a door having a water chamber and refractory lining as above-described and having door reinforcing hollow keys which are embedded within the refractory lining. The keys are connected to a water inlet for receiving water under pressure. and empty into the door water chamber from which the water is exhausted through an outlet passing through an inner face flange.

A complete understanding of the invention may lie had front the following detailed description of n specific. cnibodiment thevrof when read in conjunction with tho appended drawings. wherein:

FIG. l is an elevational view of the door inner face without the refractory lining applied thereto;

FIG. 2 is a longitudinal crossscction of the door taken along the vertical centerline ll-ll of FIG. l. with rcfractory material in place on the door inner face;

FlG. 3 is an enlarged fragmentary cross-sectional view of the door taken along line lll--lll of FIG. l which illustrates the connection of a lransvcrse hollow rib with n channel;

l-`lG. i depicts in an enlarged fragmentary cross sectional view taken along line lV--lV of FIG. l a connection between a vertically extending hollow rih and a water chamber; and

FIG. 5 shows the coupling of an inlet pipe and u channel in n cross-sectional view taken along line V-V of FIG. l.

Referring to the drawings. wherein like reference charnclcrs designate like or corresponding parts throughout the .several views. thereV is shown in FIGS. l and 2 n furnace door generally designated number Il. An outer door face l2 of heat resistant metal. for example. has its marginal portions 1.1 turned rearwardly to form n continuous peripheral flange 14. Latcrally spaced from thc outer face l2 and in parallel relationship therewith is a door inncr face 15 having its marginal portion 16 directed rearwardly. inwardly, and then outwardly to form a flange 17.

As best shown in FIG. 2. thc parallel spacing of thc faces and their flanges defines the formation of a water jacket 18 within which are arranged transverse channels 19 having their edges scaled ftxedly to thc door inner face l5. The channels 19 nrc of suflicicnt length to ezts tend or to overhang the water jacket flange portion 2l. I"lG. 5. and are cach connected to a water inlet pipe 2.. located in the portion 21 by a conduit 23. A duplicate water pipe 22 is located in the jacket portion 2l on the left side of the door ns viewed in FIG. l: as circum- .stances dictate. the water may be introduced into lh.` door from either one or both of the pipes 22. The lower end 24 of each pipe 21 is restricted in diameter and open .such that cool water may le forced directly toward the bottom of the door ll. At the .same time. water is fed through the conduits 2J to transverse channels lf) without nn appreciable loss of water pressure in the channels l) caused by the feeding of water through the open end 24 ofthe pipe 22. Clean-out plugs 2S are located inthe lowermost corners 26 of the door ll.

Keys or ribs 27 are positioned on the door inner face l5 and are joined at their ends 28 tothe flanr'e t7 of the inner face l.'-' The keys or rihs 17 are trapcroidal in crmvscclion. i510. 4. and extend across the inner fave l5 from the inner fiance 17 at one location to the inner flange t7 nt an opposed location. as shown in tt( t` Similar keys or ribs 19 are arranged between the two substantially transserse tihs 27. and between the upper farms-ene rih and the inncr flange 17. iloth ribs 2') are closed at their upper and lower ends .il hy their rigid connection with the flange t7 and with the rihi 17.

The small structural channels ll communicate with the two transverse ribs 27 via apertures .l1 passed through the inner face or plate l5. and the rihs 27, in turn. opsn into the water jacket flange portion 2t through suitable ports JJ through the inner flange t7. The water jacket I8 is flow-connected to the vertical keys or ril-s 1*? through vertical slots M prosded thronph the inner face l5. Water outlets JS extend through the door outer flange i7 into the jacket lll.

The tratto-cru: rihs 27 are upwardly inclined from their midpoint. for example. toward the flange i7 with the lowermost point being at the juncture of the rils 27 willi the structural channels l). The recess .ifi letcrern the tlOOr inner llattjte i7 is filled with n refractory material J7. which is cast ln situ and hardened within the recess. As shown best in FIG. 5. the inner flange 17 ovcrhane the material J7 at its periphery which contacts the flange, thus supporting the lining .ltl within the rece in sonic measure.

The

hollow keys

27 and 29 provide the maximum support of the lining .lll onto the inner face l5 within the rece J6 hy virtue of the trapemidal croswection of the keys nnd their special arrangement on the inner face. The upwardly extending transverse keys 27 sustain the lining JB on the inner face t5. and combined with the vertical keys 29. maintain the lining rigidly on the door. The heya are embedded within the material J7 as tite lining is cast In place.

As is conventional with open-hearth furnace doors, littlng inps J9 nre provided on the upper surface of the door. and a furnace inspection opening H and lining inspection ports 41 are standard fcaturcx Having: described the preferred embodiment of the invention. its operation maybe understood readily. Assumlng the door ll is to he placed in position on an activi.` furnace, a water line, not shown. is connected to one of the water pipe\ 22. the pipe not used leing plugged. Water is introduced into the pipe 22. which is connected to a hose and flows under pressure through conduits 2J into the structural channels t9. Water also flows through the pipe open end 24 into thc jacket lll in the flange portion 2l at the bottom section of the door.

From the structural channels I9 the forced circulation water enters the hollow keys 27 through apertures 32 in thc inner face 15, and flows through the keys 27 upwardly and transversely toward the marginal flangc portion 2l ofthe jacket lll. Die water then is fed through the ports 33 in the flange t7 into the jacket lli. The vertical keys 29 receive water from the jacket t3 and rctnrn thc water through thc saine slots J4. and the heated water is forced through thc outlet 35 and removed from Ito til)

thc door by suitable connection with a hose or pipe, not shown.

The` forced circulation of water through thc hollow keys ol the door which are embedded in the refractory material 37 of the lining J3 maintains lin,` mctal and rcfiactory material of the door at a tcmpclaturc where thc deleterious ellects of the furnace heat nre reduced, thus prolonging the life of the door. 'l'he configuration of the rihs affords maximum `support of the refractory lining. and maximum heat exchange between the water and the heated refractory material is also achieved hy the large contact area provided between the rils and the refractory lining.

lt is manifest that the above-described embodiment of tite n\cntion is merely illustrative and that numerous modifications may lc made within the spirit und .scope of the invention. Further. it will le understood that the .selection of one inlet pip.; andone outlet in the circulation system is only an example of one` type of arrangement which may irc operated tlpott in practicing the invention. and that the invention is not limited to use with one pipe and one outlet. but that both pipes and outlets may lc toed in the circulation system simultaneously, or any combination thereof` \\hat is claimed is:

i. A furnace door comprising an inner plate. an oulcr plate in spaced parallel relation with the inner plate. inarcinal flanccs extending from thc` plates and rearwardly turncd ith the inncr plate flange encoding for a first jortoa inwardly and then for a .second portion outwardly to join the outcr plate flanpc sealnjtiy. a water jacket defined ly the spaced piatcs and flanges. the inner plat': and its flange first portion defining a central recess. hollow keys of trapc/nidal cross-section .spaced within the recess and scaled to the inner platt.` and to thc inner plate first flange portion, the keys opening at their ends into thc jacket between the marginal flanges of thc plates. structural channels fixed sealingly to th.` inner plate and positioned within the jacket. the channels being in communication with the keys via apertures through the inner platc. the keys within the recess being located to anchor a refrnetory eapalle of being applied in the recess to cover the inner plate and the keys. a water inlet flow connected lo the channels and in communication with the jacket. and a water outlet connected to the outer plate and in communication with the jacket vfherehy water forced through the inlet flows through the channels and to thc jacket simultaneously. from thc channels to thc keys. and from the keys to the outlet in the sequence named.

2. A furnace door having a top. sides and a bottom comprising` .spaced inner and outer plates forming between them a water jacket. the plates having inwardlyturned flange portions joined together to provide n rccessed inner face on the door with a hollow marginal flange thereabout. a water inlet pipe extending down .said ma ginal tlangc at one side of thc door toward the bottom 1nd having a restricted discharge terminal at the end thereof .spaced from thc` bottom. a pair of spaced trnnsvcrsely-extending channels welded to the inner platc inside the water jacket. cach channel forming a water conduit transversely across the door. a connection for each such conduit to lsaid water inlet pipe. a pair of .spaced hollow keys extending transversely across the recessed inner face ofthe door. each key forming a water conduit that extends continuously across the exposed face of thc inner plate, the ends of thc hollow keys opening into the hollow flange at each side of thc door, one such hollow key being in communication at its center with the conduit provided by one of .said channels through a port in the` inner plate whereby water from lsaid channel may flow into the hollow key at thc` center and flow laterally into the flange at each side of the door, thc other of said hollow keys hcing in `similar communication with thc other of said channels, the door also having a hollow vettical key in the recessed area between the two transverselyextending keys which is in flow cow'nunieation with the space between the plates throughout substantially its entire length. a similar vertical key between the upper of the siid tranxverse1yextentling keys and the` marginal tlangc at 'he top of the door in similar tlow eonnnunieation along its length with the space between the two plates. an outlet connection nt the top of the` door and n refractory material lilling the recess and covering the keys.

References Cited in the file of this patent U N ITED STATES PATENTS Williams DCC. 15, 1931 Sticker May 1 |951 Reighart Dec. 16. 195K Robinson Feb. (i, 1962 FOREIGN PATENTS Germany Sept. 27. 1956

Claims

1. A FURNACE DOOR COMPRISING AN INNER PLATE, AN OUTER PLATE IN SPACED PARALLE RELATION WITH THE INNER PLATE, MARGINAL FLANGES EXTENDING FROM THE PLATES AND REARWARDLY TURNED WITH THE INNER PLATE FLANGE EXTENDING FOR A FIRST PORTION INWARDLY AND THEN FOR A SECOND PORTION OUTWARDLY TO JOIN THE OUTER PLATE FLANGE SEALINGLY, A WATER JACKET DEFINED BY THE SPACED PLATES AND FLANGES, THE INNER PLATE AND ITS FLANGE FIRST PORTION DEFINING A CENTRAL RECESS, HOLLOW KEYS OF TRAPEZOIDAL CROSS-SECTION SPACED WITHIN THE RECESS AND SEALED TO THE INNER PLATE AND TO THE INNER PLATE FIRST FLANGE PORTION, THE KEYS OPENING AT THEIR ENDS INTO THE JACKET BETWEEN THE MARGINAL FLANGES OF THE PLATES, STRUCTURAL CHANNELS FIXED SEALINGLY TO THE INNER PLATE AND POSITIONED WITHIN THE JACKET, THE CHANNEL BEING IN COMMUNICATION WITH THE KEYS VIA APERTURES THROUGH THE INNER PLATE, THE KEYS WITHIN THE RECESS BEING LOCATED TO ANCHOR A REFRACTORY CAPABLE OF BEING APPLIED IN THE RECESS TO COVER THE INNER PLATE AND THE KEYS, A WATER INLET FLOW CONNECTED TO THE CHANNELS AND IN COMMUNICATION WITH THE JACKET,