US2552830A

US2552830A - Furnace wall construction

Info

Publication number: US2552830A
Application number: US42944A
Authority: US
Inventors: Ernest C Witzke
Original assignee: Combustion Engineering Superheater Inc
Current assignee: Combustion Engineering Inc
Priority date: 1948-08-06
Filing date: 1948-08-06
Publication date: 1951-05-15
Anticipated expiration: 1968-05-15

Description

May 15, 1951 E. c. WITZKE 2,552,330

FURNACE WALL CONSTRUCTION Filed Aug. 6, 1948 I 2 Sheets-Sheet l ilHiB 1 Fig.4

: Willi H INVENTOR /2 Ernest G. Wiizke KMZ- -AMW m ATTORNEY May 15, 1951 E. c WITZKE 2,552,830

FURNACE WALL CONSTRUCTION Filed Aug. 6, 1948 2 Sheets-Sheet 2 Fig. 2.

Fig. 3.

INVENTOR' Ernest C. Wit ke:

l2 5 Kw! it.

ATTORNEY Patented May 15, 1951 UNITED STATES PATENT OFFICE FURNACE :l ISTRUCTlON rnesne assignments, to Gombustionllngineermg-Superheater, -Inc., a. corporation of Delaware Application August 6, 194s, seria 1No. 42,944 5 Claims. (01. i22-23'5) This invention "relates to furnace walls and -'r'nore particularly to the construction of water cooled furnace walls adapted for use -with. steam generators.

My invention is particularly designed to. keep all 'df the steam generating tubes lining the ins' e surfaces of furnace walls in predetermined "alignment and insure adefinite directionof expansion of thefurnace walls with respect to each other. Furthermore my construction is. particularlyhew and useful in the erection of the furnaceiwall tubes in that the wall tubes and their 'stifiening means do not require accurate prealignment before assembling them, thereby incurring a substantial saving in the time and cost of erection.

It is accordingly'one object of my invention to provide novel furnace wall construction which will sup ort thefurnace wall tubes in spaced alignment while permitting definite directional expansion resulting from changes in temperature.

ItIisa furtherobject of the invention to providea novel f urnace wall construction which can be erected in a simple expeditious manner and "at a relatively low cost.

With these and other objects in view as will be a parent to those skilled in the art, the invention r'esides in the combination. of parts set forth the specification and covered by the-claims appended hereto.

In the drawings:

Fig. 1 a sectionsthrough -the-cornerof two adjacent walls of a water cooled furnace taken "ontheli'ne I--I of Fig. 2.

Fig. 2 is a fragmentary 'section taken on the line l -+2 of Fig. 1.

Fig; 8 is a fragmentary section taken. on the line 3--3 of Fig. 1.

Fig. dis adiagr'aniinatic'plan section of wall support showing anchor point I2" controlling horizontal expansion of buckstay I5.

The-embodimentillustrated in Figs. 1 to 3 mprises-rows ofclosel y spaced vertical water tubes '-I{=and 2 lining the-innerwalls of the furnace 3. These tubes are connected at their lower and upper ends into headers I (not shown) which in turn are connected by tubes (not shown) into the circulation or the boiler in a well known fn'anner. The tubes I-are arranged in alignment adjacent the walls while the tubes 2 are corner tubes and p'ro'vid'e a conti'nuity of water cooled surface within the @rurnace.

Each of 'the tubes -I and 2 provided with 'a rauialiy projecting-plate 3 4 or 5 welded thereto aitspace'd-iiitervals longitudinally of the'tube and on the side of the tuberemote'from -thefurnace interior. The 'platesfi3, 4-and 5 arearrangedso 'that'one of 'their edges, in this instance their top edges, lie substantially in a plane normalto the tube. Each

plate

3, 4 and 5 is provided with a slot 6 (see Figs. 2-3) adjacent its top'edge and the tube for the reception of the flange of an angle 1. The slots 6 of all of the plates 3, 4 and '5 are in substantial alignment. Some of the :plates "4 and 5 extend out from the tubea-greater distance than thexremaining plates 3 for reasons to be described below.

"One flange 'of the angles 1 is supported by or adjacent the top edges of the

plates

3, 4 and 5 while the other leg extends into the slot 6 of the plates adjacent the tubes I and 2. The angles Textend for the full Width of the-furnace wall and ineet the angles 1 of the adjacent wall at the corners of the furnace. The-angles I provide-a means for maintaining all of the tubes in alignment and after erection. are welded to the

plates

3, 4 and 5 at their contact withtheedges of the slot 6. In this manner the angles 1 in conjunctionwith plates 3, 4 --and '5 not only maintain alignmentxof the tubes ina wall but also serve to maintain a continuity of support for all the aligned tubes and serve as well as to maintain. the spacing of the tubes. By'so supporting the tubes, the angles 1 supplement the main support ofthe tubes from the header.

The angles 1 of adjacent walls meet withtheir to'p surfaces in the same plane and are provided with a joining plate 8 fastened to their top sur- .face as by welding. An inside clip angle 9 fastens the vertical flanges of these anglestogether as'by means of rivets or bolts. There is provided at the outer edges of said joining plate 8 a corner angle I-fl normal to said plate and fastened thereto as by welding, A diagonal rib aids in stiffening the corner-structure formed by plate 8 and-angle ID. The topof said angle I 0 isflush with the bottom ofsaid plate 8. The combination of angles land 10 and the corner plates 8 thus forms a fixed structure surrounding the entirefurnace at a predetermined location adjacent the tubes I and 2.

"Asmentioned abovecertainof the plates 4 and "firexte'nd from the tubes I and 2 for a greater distance than the remaining plates 3. Such plates are shown in Figures 2 and 3; Fig. 3 show- "ing-the plate extending-from the corner tubes 2. Theedges of thee longerplates' i and 5 remote from the tubes I and'2 are in substantial alignment-an'd serve tocarry the bucksta'ys II, in this instance in the for-m of an H beam, surrounding welding. The buckstays I I are then free to move with respect to the structure supporting tubes by sliding in the slots I4 within the clips I2 and I3.

The ends of the buckstays at the corners of a furnace are not fastened together but are free to move, thereby accommodating the difference of expansion between the walls and the buckstays The top clips I3, adjacent-the corners of the clips I2 just below the clips I3 (again see Fig. 3)

have their slots I4 of sufficient width to accommodate the bottom portion of corner angle In and the flange I5 of the H beam I I.

To protect'the angle I from the radiant heat of the furnace which heat may pass between the gaps provided between tubes I and tubes I and 2, I'preferably provide fillers I6, such as rods, which are welded to at least one of the adjacent tubes and may extend only for a small distance beyond the angle I.

In constructing this wall support, the tubes I, 2 will first be erected, being supported by the headers (not shown) in a well known manner. These tubes have previously provided in the shop with the

plates

3, 4 and 5 which extend outwardly therefrom and are all in substantial alignment transversely of the tubes. Then the angles I are placed into the slots 6 of the plates 3, 4 and '5 thereby aligning the tubes, and the ends of the angles of adjacent walls are aligned and fastened to the corner plates 8. The tubes are now properly spaced apart and the angles I are then welded to the

plates

3, 4 and 5. Fillers It may now be tacked welded to the tubes.

Preferablythe bottom clips I2 are now aligned with respect to their slots [4 and welded to the

plates

3, 4 and 5 so as to provide a support for the flanges I5' of buckstays II. After the buckstays I I have been brought into place, the upper clips I2 and I3 are mounted on the flanges I5 and welded to the

plates

3, 4 and 5.

In Fig. 2 is shown by way of example, a fragment of one form of wall construction I! extending between the tubes I outwardly to a parallel plane passing through the inner face of the flange I5 of buckstay'II. It comprises an inner heat resisting refractory I8 adjacent the tubes I, backed by insulation I9 and covered on the outside by a plastic coating 20. A reinforcing 2|, such as" expanded metal lath, holds the layers of refractory, insulation or plastic in position. Such a construction may extend around all of the walls of the furnace and the angles I and plates '3, 4 and 5 are buried therein so that no air or gas leakage passes through the wall.

Any tendency of the tubes to misalign is prevented by the angles I and any pressure tending to bow the Wallis also resisted by the angles I and is further resisted by the reinforcing buckstays II since these two are held in spaced apart relation by the plates '4 and 5 and the associated clips I2 and I3. Furthermore the corner construction comprising the plates "8 and the angles I0 welded thereto'm'aintains the furnace shape by their welded union with the adjacent wall angles I and their retention of the buckstays II by means'of the welded on clips I3.

To prevent longitudinal misplacement of buckstay II with respect to the remaining wall structure, it may be welded to a certain clip I2, preferably located at the middle of the buckstay or wall (as shown diagrammatically by Fig. 4). Said clip will then serve as :an anchor point from which the buckstay may moveineither direction.

By my novel combination of parts set forth above, I provide a furnace wall construction which can be erected in a simple expeditious manner and at a relatively low cost. Nor does it require accurate alignment of shop attachments to the tubes as minor errors and inaccuracies can be compensated for on erection without extra field work. There is no field welding to the tubes thus eliminating the possibility of injuring tube tion has been shown and described, it will be understood that changes in construction, combination and arrangement of parts may be made without. departing from the spirit and scope of the inventionasclaimed. 1

What I claim is:

1. A plastic furnace wall comprising an inner row of water tubes, an outer layer of plastic refractory material, aligned in a row that extends transversely across said water tubes, each of said plates be.- ing fastened to its individual tube in a position longitudinal of the axis of said tube, and extending outwardly therefrom, each of said plates being provided with a slot extending substantially parallel to and at a predetermined dis,- tance from the tubes, and an angle iron one leg of which extends into said slots for engagement with said plates thereby aligning and spacing all of the tubes in the row, said tubes plates and angles being embedded in said r fraotory material layer and forming a unitary wall structure;

2. Plastic furnace walls each comprising an inner row of water tubes, an outer layer of plastic refractory material, a multiplicity of plates aligned in a row that extends transversely across said water tubes, each of said plates being fastened to its individual tube in a position longitudinal of theaxis of said tube and ex.- tendingoutwardlytherefrbm, each of said plates being provided with a slot extending substan tially parallel to and at a predetermined distance from the tubes, ananglte. iron one leg of which extends into said slots for engagement with said plates thereby: aligning and spacing all of the tubes inthe' row, the other legs of said angle irons of adjoining walls being in the same plane, and a corner plate welded toeach of said angle irons, said tubes, plates, angle irons and corner plates being embedded in said plastic refractory layer and forming a unitary wall structure.

3. A plastic furnace wall comprising an. inner row of Water'tubes, an outer layer of a plastic refractory material,- a multiplicity of plates aligned in a row that extends transversely across said water tubes, each of said plates be;- ing' fastened to its individual tube in a position longitudinal of the axis of said tube, and ex:- tending outwardly therefrom, each of said plates being provided with a slot extending substan: tially parallel to andat a predetermined dis; tance from the tubes, an angle iron one leg of which extends into said 'slots for engagement with 'said'plates thereby aligning and spacing allof the-tubes in thejrow, said tubes, plates a multiplicity of plates and angles being embedded in said plastic refractory layer and forming a unitary wall structure, some of said plates extending outwardly for substantially the same distance from certain of said tubes and further than the remaining plates, a buckstay extending transversely of the tubes adjacent the outer edges of said farther extending plates and having a flange substantially parallel to said edges, and clips provided with slots loosely fitting over the edge of said flange and welded to said farther extending plates thereby providing freedom for longitudinal expansion of said inner Wall structure with respect to said buckstay.

4. A plastic furnace wall comprising an inner row of water tubes, an outer layer of plastic refractory material, a multiplicity of plates aligned in a row that extends transversely across said water tubes, each of said plates being fastened to its individual tube in a position longitudinal of the axis of said tube and extending outwardly therefrom, each of said plates being provided with a slot extending substantially parallel to and at a predetermined distance from the tubes, an angle iron one leg of which extends into said slots for engagement with said plates thereby aligning and spacing all of the tubes in the row, said tubes, plates and angles being embedded in said plastic refractory layer and forming a unitary wall structure, some of said plates extending outwardly for substantially the same distance from certain of said tubes and further than the remaining plates, a buckstay extending transversely of the tubes adjacent the outer edges of said farther extending plates and having top and bottom flanges substantially parallel to said edges, and top and bottom clips provided with slots loosely fitting over the edges of said flanges and welded to said farther extending plates thereby supporting said buckstay from said wall structure and providing freedom for longitudinal expansion of said inner wall structure with respect to said buckstay.

5. A plastic furnace wall comprising an inner row of water tubes, an outer layer of plastic refractory material, a multiplicity of plates aligned in a row that extends transversely across said water tubes, each of said plates being fastened to its individual-tube in a position longitudinal of the axis of said tube and extending outwardly therefrom, each of said plates being provided with a slot extending substantially parallel to and at a predetermined distance from the tubes, an angle iron one leg of which extends into said slots for engagement with said plates thereby aligning and spacing all of the tubes in the row, said tubes, plates and angles being embedded in said plastic refractory layer and forming a unitary Wall structure, some of said plates extending outwardly for substantially the same distance from certain of said tubes and further than the remaining plates, a buckstay extending transversely of the tubes adjacent the outer edges of said farther extending plates and having top and bottom flanges substantially parallel to said edges, top and bottom clips provided with slots loosely fitting over the edges of said flanges and welded to said farther extending plates thereby supporting said buckstay from said wall structure and providing freedom for longitudinal. expansion of said inner wall structure with respect to said buckstay, and anchoring means for said buckstay comprising certain clips Welded to said buckstay from which the buckstay may expand.

ERNEST C. WITZKE.

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

UNITED STATES PATENTS Number Name Date 1,717,751 Baker June 18, 1929 1,856,036 Bennett Apr. 26, 1932 1,858,489 Foltz May 17, 1932 1,880,187 Drake Sept. 2'7, 1932 1,890,170 Van Brunt Dec. 6, 1932 1,900,443 Harter Mar. 7, 1933 1,904,189 Bailey et al Apr. 18, 1933 1,970,585 Toomey Aug. 21, 1934 2,061,404 Kerr Nov. 17, 1936 2,305,611 Frisch Dec. 22*, 1942 FOREIGN PATENTS Number Country Date 294,202 Great Britain Sept. 12, 1929 342,188 Italy July 24, 1936