US2393707A

US2393707A - Furnace wall

Info

Publication number: US2393707A
Application number: US505674A
Authority: US
Inventors: Gustav A Rehm
Original assignee: Riley Power Inc
Current assignee: Riley Power Inc
Priority date: 1943-10-09
Filing date: 1943-10-09
Publication date: 1946-01-29
Anticipated expiration: 1963-01-29

Description

-Patented Jan. 29, 1946 UNITED STATES PATENT OFFICE FURNACE v'vA'LL Gustav A; Ream, Worcester, Mas-.-,assignor to Riley Stoker Coi-poration, Worcester, Mass, a

corporation of Massachusetts Appiieatian October 9, 1943, serial No. 565,6l4

3 Claims:

This invention relates to iurnace walls, and more particularly to walls of the Water cooled type adapted for use with steam boiler furnaces.

One highly satisfactory prior construction for this purpose comprises a row of upright Water tubes exposed on one side tothe heat of the furnace and covered on the other side by a layer of refractory material, a layer of heat insulating material, and an outer casing of steel plates. However, this construction is expensive, since a considerable ,weight of steel is required, and much labor is involved in the manufacture and erection of the casing. Great care must be taken to ensure tight joints between the plates so that air leakage through the wall will be prevented;

It, is accordingly one object of the invention to provide a comparatively inexpensive furnace wall construction which will require no steel plate" casing and yet will be thoroughly efiective in preventing air leakage into the furnace.

It is a further object of the invention to pro: vide a furnace wall construction which can be erected in a simple and expeditious manner.

It is a further object of the invention to pro vide' a furnace wall construction which will remain free from buckling and distortion resulting from changes in temperature.

With these and other objects in view, as will be apparent to those skilled in the art, the invention resides inthe combination of parts setforth in the specification and covered by the claimsap'pendedhereto. I 7

Referring to: the drawings illustrating one embodiment of the invention, and in whichlike reference numerals indicate like parts:

Fig. 1 is a vertical section through a furnace wall,- thesection being taken-on'the line of l=l of Fig. 2;

Fig. 2 is a section taken on the line 22 of Fig. Bis a fragmentary elevation ofthecutside of the wall;

Fig. 4- is an enlarged fragmentary view showingthe detailed constructionv of certain parts;

Fig. 5 is a vertical section through a modified wall construction, the section being taken on the line 5 5 of Fig. 6';

- Fig 6 is a section on the line 6'-'-6 of Fig. 5;. and

Fig. '7 is a fragmentary elevation of the out side of the w'a'll.

The embodimentillustrated in Figs. 1- to 4 mclusive comprises a row of closely spaced vertic'al' water tubes to which are connected at their lower ends to a horizontal header H and at their upper ends to a horizontal header [2. Steam releas'er tubes l4 extend upwardly from the upper header [2. The end portions of the water tubes ID are bent and staggered at their connections with the headers, and. the spaces between these bent portions are filled sa isfactory a is w res b o e e arteries- These tubes I ll form the inner lining of a f;uifw an a t ey i rc edite n w heat of the furnace. In accordancje with the usual practice, water is supplied continuously tq the lower header I by suitable means not showni so that an upward circulation may be maintained through the tubes. N H u On the outer side'of tjhe row of water wall b s .10 es s r id a layer pr h a i sulating material ll which is preierably lsupported-independently of the water tubes In the particular embodiment illustrated this material rests upon a horizontal shelf l8 which projects inwardly from a horizontalbeam l9 loeated near the; lower header I l, An upper horizontal beam 2 r dm h u er der .1? a m-the e two beams I9 and 2! are connected by a series of spaced vertically elongatedupright buckstay members 22 of 1- cross section arranged with their central webs perpendicular to the plane' ot the wall and their inner flanges engaging the insulation ll; These buckstays 22 form a framework within which there is built a brick wall 24; this wall engaging the insulation ll to provide lateral support therefor. The brick wall 24 i s formed entirely of stretchers, laid in mortar with the jointsstaggered: in the normal manner, the thickness ofthe wall being equal to the widtlr of the" bricks. The lowermost; course of bricks is laid in channel members 25 which are supported on the lower beam 19 with their flanges extend-' in-g upwardly; The bricks extend between the" flanges of ,the buckstay members 22,- as best shown in Fig. 2, so that these members provide lateral support forthe' brickwork, Vertical ropes 26- (Fig. 4) of asbestos or the like may be in-i stalled between the brickwork and the central webs of the buckstays to provide a' seal against air leakage and at the same time allow for ex pension of the lzzrickworlr;

Each" vertical section of the brick wall 24 is preferably divided into panels by means of hori' zontalbeams 28 of I cross section located the plane of the wall, with the central webs of the beams horizontal and their flanges strad= dling the brickst provide improvedlateral sup port therefor. These beams 28' are free to float vertically their weight being carried solely by the brickwork; The 'endsof the beams are cobed; as best shown- Fig". 4, to'fit between the flanges of the buckstays 22 for free vertical sliding movemerit relative thereto.

In constructing thiswall, the tubes and struc: tural steel" work will first be erected, whereupon: the insulation and: brickwork will be installed, starting at the bottom and: working upwardly.- As each panel of brickworkiscompleted; mortar will-be" applied-on the top otth'e'upper course ofbricks. and one of the beams 28 willbe placed on the mortar. Mortar will then be applied to the top ofythis beam, and the nextzcourse of" bricks will be laid on this mortari The brick! work may be constructed of any desired type of bricks, and need not be expensive. For example,

' ordinary red brick or ,a cheap grade of fire brick may be used, since the insulation will protect the bricks from high temperatures; The brickwork serves to'provi'de lateral support forthe insula:

tion and to form a comparatively tight seal vertically, their weight being carried .solely by I the brickwork. The ends of the beams are coped -to fit between the flanges of the buckstays 52 for free vertical sliding movement relative thereto.

' 'It will be noted that the wall of Figs. 5 to 7 is similar to that of Figs. 1 to 3 in all essential against the leakage of air into the furnace. The 7 construction is such as to allow the brickwork to expand freely independently of the buckstays 22,

7 so that the dangerof cracking will be avoided.

" In Figs. 5 to 7 inclusive there is shown a somewhat modified'construction comprising a row'of vertical water tubes 40 which'are spaced apart more widely than the tubes H) 'of Figs. 1 and 2. 7

These tubes 40 are connected at their lower ends to a horizontal header 4| and at their upper ends to a horizontal header 42. Steam releaser tubes 44 extend upwardly from the upper header 42.

- tiles 46 between the tubes and the insulation.

Because of the wider spacing of these water wall tubes 40, there is no ne'cessity for staggering their end portions, and they'are accordingly connected to the headers in single lines; These tubes 4% form the inner lining ofa furnacewall, and they are. exposed to the radiant heat of the furnace. In accordance with the usual practice, water is supplied continuously to the lower header 4| by suitable means .(not shown) so that an upward circulation may be maintained through the tubes. r

.The wide spacing of the wat'er wall tubes 40' renders it inadvisable to apply insulating material-directly to the outer side thereof, since such material is not well adapted towithstand exposur to high radiant heat and to slag deposits I R fromburning fuel. Accordingly'a layer of refractory -material 46 is provided directly outside of the tubes, this layer preferably being constructed 'of shiplap firebricktiles. These tiles rest-upon a horizontal shelf 4'I'which projects inwardly from a horizontal beam 48 located near the lowerchamber 4l.-- Outside of the tiles 41 there is. provided a layer of heat insulating materia'l50 which is likewise supported by. the shelf 41. An upper horizontal beam 5| is' located near. the upper header 42, and this beam is connected to the lower beam 48 by a series of spaced verticallyelongated upright buckstay members 52 of --I cross section arranged with their central webs perpendicular to the plane of the'wall and their inner flanges engaging the insulation 50. These buckstays 52' form a framework within which there is built a brick wall 54, this wall engagingthe insulation to provide lateral support therefor. The brick wall '54 is formed entirely of stretchers, laid in mortar with the joints staggered in the usual manner, the thickness of the wall being equal to the width of the bricks. The lowermost course of bricks is laid on the lower beam. 4Band held in place laterally by angle bars 55 fastened to the'beam'.= The bricks extend-between the flanges of the buckstay. members:5'2, as best. shown, in Fig. 6, so that these members provide lateral support for the'brickwork. Vertical ropes 56 of asbestos or the like Both walls are comparatively inexpensive to construct, and adapted for long periods of satisfactory service under difiicult operating conditions. No steel casing is required. 1 a

While the buckstay members 2252 and the floating beams 2858fhave been described as'of I'cross section, this wording when used in the claims is not to be given an unduly limited interpretation but is intended to includesuch equivalents as H beams having wider flanges than ordinary I beams, as well as members built up of channels, angles or the like to providea substantially I or H cross section.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is: f V I 1. A furnace wall comprising an'inner row of water wall tubes, a layer of heat insulating'material outside of the water tubes, a series of spaced vertically "elongated upright buckstay members outside of the insulating material, brick-- work located between th'e'buckstay members and providing lateral support for the insulating material, and horizontal beams dividing the brickwork into panels, the buckstay members'engaging the ends of" the beams'to support the same against movement outwardly of the wall, and the beams being slidable vertically" relative tothe buckstay members.

members outside of the insulating material, brickwork located between the buckstay members and providing lateral support for the insulating material, and horizontal beams of I cross section dividing the brickwork into panels,the beams being provided with horizontally positioned center webs andvertically extending flanges straddling the brickwork, and the ends of the beam beingin vertical sliding'engagement with the buckstays.

3. A furnace wall comprising an inner row of water wall tubes, a layer of heat insulating material outside of the water tubes, a s er'ies of spaced uprightbuckstay members of I cross section outside of the insulating materiaL-the buckstay members having central webs/perpendicular to the plane of the wall and laterally projecting flanges, brickwork located between the buckstay members to provide lateral support for the insulating material, the brickwork extending" between the flanges .of the buckstay members, and horizontal beams ofsI'cross section dividing the brickwork into panels, the beams being provided with horizontally positioned central webs and vertically extending flanges straddling the brickwork; and the ends of the beams being coped .to fit between the flanges of the buckstay members for vertical sliding movement relative thereto;