US1541486A - Furnace roof - Google Patents

Description

une 9,1925. y y 1,541,486`

B. DOBxE FURNACE ROOF Filed April 23, 1923 3 Sheets-Sheet l B, DOBIE FURNACE ROOF June 9, 1925. m 1,541,486

Filed April 23, 1923 3 Sheets-Sheet 2 lune 9. 1925. 1,541,486

- B. DOBIE l FURNACE ROOF Filed April 255, 1923- 3 Sheets-Sheet 3 l Z5 Z/ Patented June 9, 1925.

y 1,541,486` PATENT oFEICE`.-T-*

BRADLEY DoBIE, or ELMHURsT, NEW YORK, AssIGNoR To AMERICAN ARCHj COMPANY, A CORPORATION F DELAWARE.

FURNACE ROOF.

Application md April as, 1923." serial No. 633,906.

I of which the fdllowing is a specification.

' My invention relates to furnace roofs, and is especially concerned with furnaces of cir` `cular form or the like,typiied'by oil still furnaces. Besides simplicity, relatively low cost and-facility 'of'.construction, the pre-l ferredV embodiment of thev invention here shown` affords the advantage of supporting the roof independently ofthe refractory furnace lining or wall,-with .freedomjfonindependent expansionl and contraction without lateral` stress or strain'onsuch wall,-` obviates allrisk of collapse of the roof, mininiizes spalling and other local deterioration, and allows the roof to be quickly repaired or replaced (in 'wholeor inv part) with the least trouble and expense.; It also offers the advantage thatstandard parts (already commerciallyV available) can be employed. v

How these and other advantages can be realized Ithroughthe invention in a novel manner `will appear from my description hereinafter of the best construction for the purpose that is vknown to me.A

Inthe drawings, Fig. 1 fs a somewhat diagrammatic illustration of an oil still furnace, in vertical mid-section as indicated'by the line 1-1 in Fig. 2,.,with the intermediate portion broken out and omitted.

` Fig. 2 is a plan view of the furnace, with part of the actual roof omitted to make other features of construction clearer.

Fig. 3 is a fragmentary side View with the outer shell of the furnace wall broken open to expose certain features of the roof construction. 't Fig. 4 is a fragmentary view somewhat similar to the upper portion of Fig. 1, 4but showing more details,certain parts being in section as indicatedI by the line 4-4 in Fig. 5. l Y

Fig. 5 is a fragmentary plan view of the roof proper and certain associated parts below the line 5 5 in Fig. 4.

In the present instance, there is shown an upright cylindrical still drum 10 supported in the usual manner, and a surrounding cylindrical furnace wall or shell 11. This Wall 11 consists of a metallic shell proper 12 with a refractory lining 13in the form of a wall of the usual construction spaced in'- ward from said shell 12 to afford. a thermo.- insulative dead air space. As'here shown, the still drum 10' extends above the refractory lining 13 (and, indeed, alsov above the metallic shell 12), and only the space between wall 11 and drum 10 is roofed over.

VThe refractory roof 15 here illustrated (see, especially,.Figs. 1 and L1) has the form of a flat pitched dome with a large opening in its center for the drum 10; in' other words, it is virtually a minor'zone of a sphere of very large radius. It is also domebuilt in that circumferentially adjacent refractory brick composing it divide or abut along substantiallyror approximately radial planes. As shownv in Figs. 2 and 5, indeed,

the brick are arranged both convergently and annularly. Instead,however, of being supported byarching interaction with 'the refractoryy inner'wall or lining 13, this'dome 15 isl supported quite independently, by sus- VVKpension from the overlying and circumjacent frame and shell structures 16, 12.

As here shown, the roof 15 is composed of ran annular sries of radial rows of brick 17 and 18. The rows 17 are of uniform' width, being composed of standard bung brick (such as .are now inv use-for roofing metallurgical furnaces) with their undercut heads engaged between curved rods 19, 19 themselves secure-d at opposite ends yby clamps 20 in the usual manner. These radial bungs 17 are suspendedv at their ends by means of hanger rods21 attached to the clamps 20 and=having at their upper ends lanchor pieces 22 to take over the vertical' anges of supporting members23 and l24 consisting of angle bars bent to ring form, one-rather close around the drum 10 and the other inside the shell 12. .Thebrick 18 intermediate the bungs 17 rest on the latter, and have shoulders 25 on their ends "(Fig. 3) for engaging in corresponding rabbets of the bung brick. Thesevbricks 18 are successively shorter and shorter from the outlside inward, so that each row as a Wholel is of sector-like or triangular shape in plan.

Besides the rings 23 and 24, the supporting structure 16 f comprises a polygonalI frame consisting of I beams 26, 26 resting on the flanged top of the shell 12 and other I beams 27, 27 extending between them. On the sides of the square thus circumscribed around the drum rests the inner p ring 23, while the outer ring 24 restson the nitely sealing against the drum 10. At its outer edge, the roof is sealed with the top of the wall in any suitable manner, as

by a .packing 30` of sand, asbestos. wool faced with crushed fir'ebrick and ireclay, or other material. At its periphery, the roof 15 proper is engaged by arow of inclinedfaced f abutment brick 31-resting on sealing material 32 (suoli as asbestos wool) just outside the topmost shoulder of thel wall 13. lfhe brick 31 are surrounded by a flat metal binder ring A33 (here shown as divided into quadrant segments), which serves as a means for holding or crowding the brick 17, 18 convergently together toward the drum 10, and for holding the roof 15 in place generally. Inward pressure is exerted on the segments of thering 33 by appropriately located push rods 34, which are yieldingly urged inward by helical compres-l sion springs 35 in tubular casings 36 themselves sustained .by the circumjacent shell structure 12.l

l claim:

l. ln a furnace of the character described, the combination with an upright drum and a surrounding furnace wall, of a furnace roof around said dr'um sealed therewith and with said wall, but supported independently of either.

2. ln a furnace of thecharacter described, the combination with an upright drumand a wall varound said drum, of a dome-built suspended refractory brick roof for their interspace, with means 'for holding y the brick of said roof convergently together toward the drum. 3. ln a furnace of the character described, the combination with an upright drum and a surrounding refractory wall, of a framework over the interspace between them supported independently of said wall, and a refractory roof for said interspace sealed with dr'um and wall, and composed of brick suspended from said framework.

4. In a furnace o-f the character described, the combination with an upright drum and a surrounding wall, of a roof for said furnace sealed' with said drum and wall, and comprising an annular series of refractory bungs converging toward said drum and suspended by their inner and outer ends.

5. -n a furnace of the character described, the combination with an upright drum, a

surrounding refractory wall, and a `circumjlacent supporting structure, of a polygonal framework circumscribing said drum carried by said supporting structure, with inner and outer supporting rings adjacent la refractory 'wall around said drum, of a suspended refractory roof for the interspace supported independently of thevreholding means circumjacent and peripherally engagingsaid roof sustained against its horizontal thrust independently of said wall.

7 In a fnrnaceof the character described, the combination with an 'upright drum and a refractory lined metal shell around said dr'um, 'of a suspended refractory roof for said furnace around said drum supported from said'shell.

8. A furnace of the character desc'ribed comprising a metal shell and a refractory lining therewithin, a supporting structure carried by said shell, a dome-built roof of refractory brick suspended lfrom said structure within said shell and sealed to said refractory lining, and means pushing inward from said shell von the periphery of said roof to hold its brick tightly together.

9. A refractory Yfurnace roof comprising an annular series ofconvergent suspended rows of bricks.

10. A refractory furnace roof comprising an annular series of converging suspended bungs, and intermediate sector-like rows of brick resting on said bungs.

11. Av refractory furnace roof comprising a framework with annular supporting members one within another, and. an annular series of radial bungs suspended from said annular members.

12. .A dome-built refractory furnace roof lil() for yieldingly pushing inward on the latter to crowd the brick together.

13. A refractory furnace roof comprising an annular series of convergentrows of suspended brick, a peripherall'y surrounding segmental binder ring, and means for exert-A" ing inward pressure on the ring'segrnents to hold the brick together.

14:. A circular furnace roof comprising in combination, an overhead supporting structure, a plurality of radially disposed rows of `bricks carried by said structure, a

segmental ring at the periphery of the rows,

80 fractorywall but sealed therewith, and

ring to hold the bricks in contact with one another during expansion vand contraction of the roof.

15. A circular furnace roof comprising in combination, an overhead supporting structure, a plurality ot' radially disposed rows of bricks carried by` saidV structure,. and means for yieldingly pressing said bricks together to maintain them in contact with one another during expansion and contraction.

16. Ina furnace roof, a plurality of rows of suspended bricks radially arranged, a plurality of rows of intermediate bricks suspended from the former, and means yieldingly pressing thev bricks together tov maintain them in Contact With one another during expansion and contraction, the bricks being formed and arranged to constitute a substantially ,circular roof.

In testimony whereof,

I have here'unto signed my name. i

BRADLEY DOBIE.

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