US2550729A - Furnace door - Google Patents

Description

May 1, 1951 J. E. STICKER, JR 2,550,729

FURNACE DOOR Filed 001;. 17, 1945 www J.

Patented May 1, 19H51 lessepE., Sticken; Steubenville.; Ohio; assigfnori:v I of one.finali?. to JohnfL. 'Iatmarty Steubenville;

Applicatimoetpbesiv, 1945,serialgNo- 622,847-

4Theinverntionarelates todoors iforfurnacesrandf more particularlyxto1aA water cooledLdooraesper-v i. cially, adapted .for use i upon:1..open. hearth; fun-r.- naces, i melting.l furnaces .iand'fthe' like,v where. the inner surface. .ofi therdoor yis exposedito. extremely highx temperatures.

It is `commonpractice toaprovide. Watercooled: doorsV `for Y open hearth :furnaces and similar. fura naces, saidI u doors comprising ay shell i formingia f. Water .-j acket'; overv vthe aoutersiderof .the door`V with# inturned marginal rails .providingapocketzupons the yinner 'side ofthedcior,` which isfl-led Withxa suitable `refractorysuch .as Jre Lclay,` brick Lor a refractory cementor plastic; providing.` afrefrace l tory vinner surface :for i. the-door. which iis exposed to; theextreme. heatof the furnace.

In actual use this refractory lining is quicklyv4 burnedouaburning away rst at the central portion of the door while themarginal portions of the refractory-liningV adjacent to the water cogledfmarginal rails of fthedoor remainsubstantially intact. 1

The average life of suchr a refractory lining in open hearthdoors is about twenty heats, after' Which/the door must be removed from the/furnace, the old burned-outrefractory lining-v removed and the door-relined with; suitablerefr-actory material before-it-isf-replaced-upon the furnaceQ-. .Y` 'Y This requires considerable-laborjas Well-asre-A fractory material` Atoreline the-- doors andf-keep theml in condition -fcruse,A addingfconsiderably to -thef` expense of maintaining-Y the furnace; in

working condi-tion.- i

,The Object Oithefpresent invention is t provide awater cooled doorforuse on open heaijfth.,V

rested thatlthelife' furnacesand the like, so consW y V y of the refractory 'lining Will""b'e many times the life of the lining of the conventionl furnace door.

Another object is to provideV a furnace door comprising a shell forming a water jacket on the exterior side of the door and having Water cooled, inwardly disposed, marginal rails, and one or more Water cooled rails communicating with the water jacket and located upon the inner side of the door so as to divide the same into separate panels lor pockets Which are adapted to be lled with refractory material, with means for circulating cooling Water through the water jacket and through all of said rails.

A further object is to provide a door of this character in Which all of said water cooled rails llaim, (Cl. 12g-49.8) r

are of less thickness toward the outer side of the Y door and are of greater thickness at a point toward the inner side of the door, so as to provide i 2- substantially dovetail pockets togreceiyexand re.- tain the/.refractory lining material.v i The above objects,- together with' '.others., which; Willbe. apparent from the .drawing and:foll'oyvi-ng;V descriptionrbr which. mayv be later referredj'fto maybe attain by constructing'therimprcyecl furnace/door he. manners'. illustrated'fint aocompanyingtldrawing, in which:

Figure;k 1 :is an.I elevation `.of the: inner. side of. an

open hearth furnacedoor constructed lin-acc ancefwith:theinventiori'` Fig:.,2 :a 1horizonta1,.fsectional VView taken as on, thehuela-2,1'Fig.1;v i Fig. :Spavertical sect9121fryieyvtaken .as-.on th lineari-1Figy 1l; .and,: v 2 Fig..y 41afragmenta-ryf:= secticm;A taken as Aon gthe; line 4 -4, Fig. 1; f p The door vincludes a ;,hol1o.v`v` y of.: the. spaced, outer andginner nd'fl I respectively;:whichmayxbefsteeliplates vconnected` inspaced relation: as bythe pipe stays orlspace'rsf I 2 .having their opposite. ends locatedwithin suit-,rif able openings I3 within the Walls II'I and II and: attached thereto A,as 3 by welding; thus- .proyiding av Water jacket zor,.,chamloeroyerthe ,outer 4side of the.4 doorfasyindicated eat* IA. l y 4 l Thegdooris providediaround-itsma nah p n Y with the inwardly. disposed', water f ooleclj. r ls indicated l generallyr. at I5; anda; com'1nunieatiiigvr withthe water jacketIlI; s o tha Waterpcirculated I therethrouglrfromctheinletI6 o the'outlet; ia'I. will also becirculated throughssaid-imarginal.rails. The :inner.,sidewalls tI irofv the :marginal rails I 5:; are4 pref erablyfinclinedas.shownin r, the vdrawing` foriafpurposertoxbe later explained Withithefzexception .ofatheinclined innerkwalls 1 I8 :of thefrnarginalifrailal` the. construction thus f ar. described J is g substantially-:the conventional form -cofgopen hearthfrfurnace door; theimarginal Water cooled rails forming a pocket upon the inner side of the door Which is filled with any suitable refractory material exposed to the heat of the furnace.

This refractory lining rapidly deteriorates under the high temperatures to which it is subjected, burning away rst at the central portion of the door, While the marginal portions of the refractory lining adjacent to the Water cooled rails I5 remain substantially intact.

The present invention contemplates a construction which prevents this rapid burning away of the refractory lining and lengthens the life of the same to many times the life of the refractory lining in the conventional door construction.

This may be accomplished by providing one or cooled rail is shown in the drawing, and this inl vertical position, it is pointed out that one or any desired number of intermediate water cooled rails maybe provided and may be located either vertically, horizontally or diagonally as conditionsV may require. l Y

In the form of the invention illustrated in the drawing, a single hollow, Water cooled rail I9 is provided through the vertical center of the inner side of the door, extending from the upper marginal rail to the enlarged chamber 20 communicating with the lower end of the vertical rail I9 and with the lower marginal rail of the door, and formed by the arched plate 2l which surrounds and is spaced from the pipe stay or spacer 22, having its ends located within suitable openings in the back wall I and in the front Wall 23 of the rail I9. The pipe 22 thus forms a peep hole through which the interior of the furnace is visible so that the condition of the metal bath may be observed therethrough.

The intermediate rail I9 communicates with the water jacket I4 through the slots 24 and the straight portion of this rail communicates with the enlarged chamber 20 through the opening 25. The upper end of the rail I9 communicates with the upper marginal rail I through the opening 26 and the lower end of the enlarged chamber 20 communicates with the lower marginal rail I5 through the opening 2'I.

With this construction the inner side of the door is divided into two similar pockets which may be lled with suitable refractory material such as lire clay, KN plastic refractory cement, brick or other suitable refractory as indicated at 28.

These pockets being of dove tail form, will tend to better retain the refractory lining therein and as the refractory sections I'I are of considerably less width than in the conventional door, it has been found in actual use that the refractory lining does not burn out as quickly as in the conventional door but lasts many times the life of the refractory lining in the conventional door.

After considerable use of the improved furnace doors in a steel plant, it has been found that where the conventional door had to be relined after an average of twenty heats, doors con- ,structed as disclosed herein will retain the lining in condition for use for an overall average of between one hundred and fifty and one hundred and seventy-five heats and in some in- Hthese rails are illustrated and described as preferably of substantially dove-tail shape, it should be understood that the rails may be of any cross sectional shape, such for instance as pipe either round or flattened, or other cross sectional shape which will form a suitable conductor for the cooling mechanism.

I claim:

A furnace door comprising a hollow metal shell forming a water jacket over the entire outer side of the door, inwardly disposed, hollow, water cooled rails at the marginal edges of the door and communicating with said water jacket, intermediate, inwardly disposed, hollow water cooled rail means extending to the inner side of the door and communicating with said water jacket and dividing the inner side of the door into separate pockets, refractory material filling said pockets, a transversely disposed tubular member located through the door from the outer side tothe inner side thereof and providing an opening entirely through the door, and a water jacket surrounding said tubular member and communicating with the intermediate rail means and with one of said marginal rails whereby said opening is water cooled throughout its entire length.

JESSE E. STICKER, JR.

REFERENCES CITED The following'references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 48,446 Rogers June 27, 1865 387,419 Jordan Aug. 7, 1888 869,575 Johnson Oct. 29, 1907 1,168,648 Knox Jan. 18, 1916 1,690,606 Williams Nov. 6, 1928 1,690,619 Christy Nov. 6, 1928 2,259,900 Loxterman Oct. 2l, 1941 2,355,142 Bulmer Aug. 8, 1944 2,360,855 Dow et al. Oct. 24, 1944 FOREIGN PATENTS Number Country Date 492,432 Germany Feb. 21, 1930

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