US2398622A - Reverberatory furnace - Google Patents

Description

April 146, 1946. T. cRNczlcl-lA REVERBERATORY FURNACE Filed Aug. 24, 1942 Patented Apr. 16, 1946 2,398,622L ECI?.`

REVERBRATORY FURNACE;

Tony Crncich, Noranda, Quebec,.Canada,.assgnor to' M'. H..Dtri'ck' Company, a corporation of' Delaware ApplicationiAugustV 24, 1942, Serial-No; 456,110 InrCanada September 24,1942.-

2 lalfns:

This t invention4 re1atestoi furnace' construction,

and to. refractory sections or blocks' for" use in` furnace cons'truction;b and-1 morey particularly to` members inthe side Wal-l construction of reeverberatory furnaces.

In such a furnace, the cli-argeremployedu which` con sists'o'f not` roasted calcines'; is tedrdownwardly through fettlingpipesspacedlongitudinally along eachy side of,` the' furnace at: oneend thereof, and

tends to buildup andsubstantially cover the' side.. walls. The chargefis progressivelyl fedl into thefnrnace andv melted by powdered coal: burners,7

narily employed for the topportions of theside walls, which: results inthe side walls'being rapidly burned. out when not covered by the furnace charge.

A principal ologect4 of the. present invention is the provision of arelatively largeV refractory sec.- tion or block whichis adapted to bev-employedin building up or repairing the upper `portion of the side walls of a. reverberatory furnace.`

Another-' important object. ofA the invention. is the provision off such. a refractory section which is suspended from and supported. by the frame members normally employed" for supporting. the roof of the. furnace..

A further important object of" the invention is the provision off a refractory section orv block which comprisefsa block of basic magste material, to' which has beenI added a;- suitable binder', and which is supported by projections' extending Fig.y 2` is af` vertical, longitudinal section taken substantially on" line 2d2 of EigureA 1;

ig; 3` is a top plan View of the improved refractory section or bl'ock of thepresent inven` tion;`

Fig. 4 is a front View of the improved-refractory section or block of the present invention; andV Fig..5' is. aside view of. the improved refractory section or block of the present invention;

ReferringA more particularly tothe drawing, part of a reverberatoryf furnace is disclosed therein which comprisesa plurality of vertical support-1A ing' members or backstays II which are arranged in longitudinally spaced relationship to each other in two' rows. Extending across and supported by the opposed backst'ays II are' a. plurality of lon` gitudinarlly spaced, horizontallydisposed supporting'members' or beams I2. Supported bythe beams t2A and extending' transversely thereof and longitudinally of` the furnace are a 'plurality of arch suspension beams I3, from which tile` or brick supports Id are suspended 'by'suitable suspension; rodsA I5. Each ofgthe' brick' supports I4 carries alplurality of refractory bricks Ito'form a suspended roof structure for the furnace.A This roof structure is substantialy' identicalto that disclosed Canadian Patent No. 381,931,- issued June 6', 1939, to CharlesfF. Pollen..

A.v charge floor I'I is` disposed ab'ove the furnace ro'o'f inA well-known manner, andis provided with' suitable openings adjacentl and spaced inwardly' from.. each of the rows: of backstays II', within which` are disposed' calcine bins I8. A calci-ne car I9 of usual construction is mounted for longitudinal movement above each of the bins ilit.` Aplurality of fettling pipes 2| extend downfrom the block, preferably by a bent' wireembedded in the' magnesit filler.. ri such construclfion a reinforcing plate is" preferably employed' in the central portion of' the block.

Another' important object of the invention is to' greatly reduce thel operating cost of a rever'- be'ratory furnace and materially to increase` the facility of repairing the' same' by'p'roviding large, suspended, refractory. sections orblo'cks" from the upper portion of tliesid'e walls vof the furnace'.

Numerous' other" objects' and' advantages of the invention will b 'e' apparent it is betterl understood from the following'descriptiozi, which', when taken in connection with the accompanying drawing, discloses apreferred embdinint'- of the in" verition'.

In the" drawing',

Figure 1`A is a" transversevertioalf sectional: view, with parts:` broken away', threugn a portion# ofv a reverberatory furnace, and showing the use of the present invention;

war'dl-y in longitudinally spaced relationship from each calcine bin I8 to a point slightly below the refractory bricks I6 of the suspended roof structure of the furnace, and the usual fettl-ing opera'tors platform 22' is' provided along the outer side-ofeach row' of backstays II'. Theside Walls of th'e reverberatory furnace are supported by the .backstays' IIA and normally comprise silica bricks 231 which are laid in the usual manner, although'. being shown in Figs. 1 and 2 as solid wall structures.

In the operation of.` such a reverberatory'fur-- nace,-Y thefcharge employed consists of hot roasted calcines which are fed' from the cars I9 to the bins II3', and through the fettlingy pipes' ZI into the' interior of the? furnace. The charge is progressively fedinto the furnace, and tends to build up and substantially cover the side walls 2'3, as shown at 2'4 in Fig. 1. The charge 24 is melted by powdered co'al burners' (not shown), and they melted charge flowsto the end of the furnace opposite that at whichthe burners and fettling. pipes 2l' arel disposed, where the molten slag and matte are tapped from the furnace.

The upper portions of the side walls 23 are frequently exposed, particularly between the longitudinally spaced fettling pipes 2|, and are thus c Y the temperature of the furnace normally ranges in the neighborhood of 2700 F. In the prior art constructions, silica brick is ordinarily employed for these upper portions of the side walls.

The present invention contemplates the provision of a number of relatively large refractory sections or blocks, indicated generally by the reference numeral 25, as the upper portions of the side walls 23 of the furnace. In actual practice, each refractory section or block is preferably approximately 36 in height, 15" wide and 9" thick. These sections are disposed directly above the refractory bricks 23 and extend to a point adjacent the lower surfaces of the outer roof refractories I6.

As will best be seen from Figures 2 to 5, each Vrefractory section 25 comprises a block of nonacidic or basic refractory material 21, preferably magnesite (magnesia), which is mixed with any suitable binder. If desired, chrome Acan be used with magnesite as the plastic basic material. A metal supporting member or wire 28 is embedded in the basic refractory material, and the wire preferably has the shape indicated in Figures 2 and 4, with outwardly vcurved end portions disposed adjacent the bottom of the block 25 and an upper looped or bent-back portion extending above the upper edges of the block.' The wire 28 comprises the means by which the refractory section or block 25 is suspended and held in proper position.

The block 25 is preferably provided with a reinforcing plate 29. This reinforcing plate or Vsubject to an extremely high temperature, since with 'the usual .procedure of laying the silica brick 23.`

, The refractory sections 25 also have the material advantage of use as repair units in reverberatory furnaces in which they have not been originally installed. In such a construction, if a piece of one of the side walls `burnsI out, it is necessary merely to clear a hole of suicient size to receive one or more of the refractory sections 25 and position the latter therein. In this regard, as well Y as in an initial installation, the relatively large metal sheet 29A extends centrally of thethickness of the block and preferably extends throughout the height and width of the block.

Suspension rods 30, which are substantially similar to the suspension rods l5, are suspended from the outer beams I3, as shown in Figure 1,

provide outward extensions of the suspended roof structure.

With the above described construction, the upper portions of the side walls of the refractory furnace will withstand the extremely high heat to which they are exposed fora much longer period of time than is normally the case when the silica bricks 23 are employed for such portions of the Walls. The magnesite, or magneSite and chrome, material of which the blocks arey made, will withstand a high temperature for a much greater length of time than the silica brick 23.V A very appreciable saving in operating cost of 4the furnace is thus effected, since repair or replacement of the upper portions of the side Walls will be greatly reduced. The present construction has the further advantage of facilitating any repair or replacement of the upper portions of the side walls of the furnace which may become necessary after a period of long usage. This is due to the face that the suspending of the refractory sections or blocks 25 greatly simplifies the installation thereof in comparison relatively large refractory sections suspend size of the refractory sections or blocks 25 is of primary importance.

The production of the refractory sections or blocks 25 without an outside metal covering or container is also of importance in that it avoids the use and expense 'of such metal containers, which metal is of course burned away during the operation of the furnace.

The improved refractory sections or blocks 25 of the present invention can be formed in molds, and the refractory material such as magnesite can be either hand tamped or can be tightly packed together with an air hammer, after suitably positioning therein the suspension wire 23, and the-reinforcing plate 29 where such plate is employed.

It is thought that the invention and many of its attendant advantages will be understood from the'foregoing description, and it will be apparent that various changes may be made in the form, construction and arrangement of the parts without departing from the spirit and scope of the invention or sacrificing all of its materia1 advantages7 the form hereinbefore described being merely a preferred embodiment thereof.

I claim: v

l. In a reverberatory furnace provided with supports; av plurality of refractory blocks suspended from said supports to form a roof structure, and side walls comprising lower xed portions of refractory brick and upper portions forming a continuation 0f said lower portions and extending therefrom to said roof structure, said upper portions being constituted by a plurality of relatively large refractory sections suspended from said supports, each of said sections comprising a block of non-acidic refractory material and a ,suitable binderutherefor, a metal reinforcing plate embedded in said block and extending substantially from top to bottom thereof in parallel relation to the heat receiving face of the block, and a supporting member embedded in and extending from said refractory block to provide means for suspending said refractory section. 2. In a reverberatory furnace provided with supports, a plurality of refractory blocks suspended from said supports to form a roof structure, and side Walls comprising lower fixed portions of refractory brick and upper portions forming a continuation of said lower portions and extending therefrom to said roof structure, said upper portions being constituted by a plurality f d from said supports, each of said sections compril,ing a block of non-acidic refractory material and a suitable binder therefor, a reinforcing plate positioned in said block and extending substanextendingfrom said refractory block to provide means for suspending said refractory section.

TeNY CRNCICH.

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