US2808816A - Fluid cooled wall - Google Patents

Description

Oct. 8, 1957 L. LANGVAND FLUID COOLED WALL Origmal Filed March 12, 1946 I INVENTOR [Var L.

Langvand ATTORNEY United rates PatentO l 1. 2,808,816 FLUID ceornn WALL Ivar L. Langvand, Barberton, Ohio, assignor to The Babcock & Wilcox Company, Rockleigh, N. L, a corporation of New lersey Original application March 12, 1946, Serial No. 653,843, now Patent No. 2,633,831, dated April 7, 1953. Divided and this application April 3, 1953, Serial No. 346,592 a 4 Claims. (Cl. 122-235) in close succession therealong so as to afford a large available area of heat absorption surface for a given area of interior furnace wall surface; Openings are provided between tubes in the wall so as to permit access to the interior of the chamber for purposes of inspection or for the insertion of tools for removing slag or other accumulations from surface areas within the chamber. For each of such openings a novel form of closure means is provided, suitably in the form of a door having its supporting structure in heat transfer engagement with tubes adjoining the wall opening.

The present application is a division of my copending application Serial No. 653,843, filed March 12, 1946, now Patent No. 2,633,831. 1

The various features of novelty which characterize the invention are pointed out with particularity in the claims wall opening 134. vAn adjoining tube 135 is similarly bent, although to a lesser degree,'to provide a straight length portion 136 displaced inwardly from the row, as shown in Fig. 2, ma plane normal to the plane'of the row, thereby defining theextent of intertube space required to accommodate the obliquely positioned bent tube portion 132, the displaced portion 136 of tube 135 being maintained parallel to tubes 11afor a suflicient distance to clear the bends in tube 131. For wall tubes of three inches outside diameter, as in the present embodiment, each tube bend is made on a centerline radius of eighteen inches to provide both the outwardly displaced vtube portion 132 and the inwardly displaced tube portion 136.

A plate 137 shaped as in Fig. 3 is welded to tube 131 along the curved plate edge 138'to substantially close the gap between the bent-out portion 132 of tube 131 and the bent-in portion 136 of tube 135, plate 137 having a straight inner edge 139 formed with slots 141 therein for resilient engagement with the straight length tube portion 136. Plates 142 arewelded to tube 131, at the opposite side from plate 137, along the curved plate edges 143, to close the gap between tube bend 132 and tube 11a at the opposite side of opening 134 from tube 135, the plates 142 having horizontal edges 145 longitudinally separated along tube 131 a distance equal to the eflective height of opening 134 as determined by. the height of the door frame opening 146. Each plate 142 is formed with a slotted straight inner edge 147 for resilient engagement with the associated wall tube 11a.

The closure unit for wallopening 134 includes an inner door frame casting 149 formed with a longitudinal projection 150 having a curvedrecess surface 151 conformannexed to and forming a part of this specification. For

a better understanding of the invention, its operating ad vantages and specific objects attained by its use, reference should be had to the accompanying drawings and descriptive matter in which a specific embodiment of the invention is illustrated and described. 1

Of the drawings: a

Fig. 1 is a fragmentary horizontal section of a furnace wall embodiment of the invention;

Fig. 2 is a sectional side view related to Fig. 1, taken along line 22;

Figs. 3 and 4 are fragmentary views related to Fig. 1, taken along lines 33 and 4-4 respectively showing certain wall tube formations;

Fig. v is a fragmentary plan view, similar to Fig. 1, showing a modified .furnacewall construction; and

Fig. 6 is a projected side view of Fig. 5 showing elements included therein.

Figs. 1 and 2 show a furnace wall construction in which parallel tubes or tube lengths 11a are arranged in closely spaced contacting relationship along the inner side or face of an outer boundary Wall 11. Openings are formed between tubes of the row, for inspection or lancing, for example, suitably by bending portions of tubes adjacent the locations at which such openings or ports are to be provided. The construction also includes suitable closures for such openings.

In detail, and referring first to Figs. 14, a lance door construction is shown in conjunction with contacting parallel tubes 11:: arranged upright and associated with an outer wall 11 of a combustion chamber, the same general construction being applicable to other locations in the same wall or in other walls of similar formation. A wall tube 131 has a portion of its length bent outwardly from the row of tubes 11a, as shown at 132 in Fig. 3, in a plane oblique to the plane of the row at an angle of from 55 to 60 degrees, for example, to provide the desired extent of ing to and bearing against a straight tube 111; at one side of the opening, the body portion of the frame having a curved recess surface 152 conforming to and bearing against the bent-out tube portion 132 at the opposite side of the opening. Inner framev 149 is secured to the wall by studs 153 and 154 extending through top and bottom flanges 156 and screwed into nuts 157 welded to wall tubes, each stud 153 extending through a flange portion 158 parallel to the tube row and engaging a nut welded to a tube 11a adjacent the opening, and each stud 154 extending through a flange portion 159 inclined to the tube row at about twenty degrees and engaging a nut welded to the displaced portion '136 of tube 135, the assembly including nuts attached to the outer ends of the studs.

The outer frame 161 and horizontally swinging door 162 are of the type disclosed inU. S. Patent 2,383,032, I. Abernethy, datedpAugustZl, 1945, the door 162 having a latch 163 rotatable in a vertical plane and engaging catch 164 on the frame. In the specific form herein disclosed, door 162 is fitted with an insulating plug 165 of unsymmetrical cross section extending a considerable distance into and substantially filling the door frame opening 146 to protect the adjoining walls and door from furnace heat, the plug 165 comprising a sheet metal retainer 167 filled with suitable heat insulating material 163. The inner and outer door frames 149 and 161 are secured together by cap screws 169 and 171 along opposite sides, screws 169 at one side extending into outer frame 161 through side flange 172 of inner frame 149, and screws 171 at the opposite side extending into the outer frame through a thicker inner frame portion. Inner frame 149 includes an integral lug 173 extending into the outer frame opening closely adjacent a side wall thereof throughout the height of the opening. 7

It will be noted that the centerline of door frame open ing 146 is laterally ofliset from the centerline of wall opening 134 toward the side occupied by wall tube 11a thereby rendering the described assembly particularly useful for lancing operations along an adjacent combustion chamber 7 wall, not shown; for example, a wall at an angle to wall 11 toward the side occupied by tube 135.

Figs. and 6 illustrate a modified construction wherein an innerv door frame 149a is secured to straighttubes 11a at oppositesidesofwall opening 134, thereby simplifying fabrication and assembly. of the-frame required. 'Ilubes 131'and135 haveportions displaced from the row as before and similarly received in framerecesses .151.and 152. Inthis form, the flange portion 159a is in a plane with flange portion158 parallel to the. tube. row, andstuds 153 of equal lengthsare insertedthrough holes 175 therein for securing thetframe to-straight tubes 110: at opposite sides of the wall opening, there beingno attachment to the displaced portion 136 of .tube. 135. -Cap screws169 and 171 extendthrough holes.176 and 177respectivelyfor securing inner. frame 149atojoutenfranie 161.

While in accordance. with the provisions of thestatutes I have illustrated and describedherein specific forms of my invention now known to me. thoseskilled in. the art will understand that changes may be made inthe. form of the apparatus disclosed withoutdeparting from the spirit of the invention covered by' my claims, and that certain features of myv invention maysometimesbe used to advantage Without a corresponding use of other features.

What is claimed-is:

1. In a furnace wall comprising a row of parallelsubstantially contacting tubes, means defining an:opening. in said wall comprising two adjoiningtubes.of-said-wall respectively having portions offset toward opposite sidesof said row into positions at a singleside of said opening, one of said two tubes havingits offset portiombentvtoward the outer side of said row in a plane oblique tosaid row and theother of said two tubes having .its otfsetpon tion bent toward the inner side of said row in arplane intersecting said first named. plane, .a door. frame. disposed at the outer side of saidrow. and'providing. communication with said wall opening, .said. frame having awallportion atone side of said-opening. engaging the outwardly oifset portionof said-onetube and. having. an opposing wall portionengaging a separate. tube of said row at the opposite side. of saidlopeningmeans securing said door frame to wall tubes disposedat'opposite sides of said opening, said securing means-includinga detachable connectionextending from. said:frame to. said. separatewall tube, and a secondidetachable-connection extending from said frame to a tube of. said row otherthan saidtubebent in saidintersectingtplane.

the axes of the offset portions of said adjoining tubes intersecting each other, a frame having an interior passage adapted to register with said opening and having portions thermally engaging portions of some of said fluid cooled tubes at opposite sides of said opening, said engaged tube portions including the oifsetportion of at least one of said adjoining tubes, said frame being secured to tubes at opposite. sides of said opening, and. a door for said opening mounted onsaid frame.

3. In combination, a furnace wall having contiguous fluid cooled tubes arranged in a row, means defining an opening in said'wall comprising adjoining tubes of said row disposed on the same side of said opening, each of said adjoining tubes having an intermediate offset portion formed by bends the axes of which lie in substantially a single vertical plane, the vertical planes determined by the axes of the offset portions of said adjoining tubes intersecting each other. at a pointexteriorly of the furnace, a frame having an'interior passage adapted'to register with said opening and-having portions thermally engaging portions of some of said fluid cooled tubes at opposite sides of said opening, said engaged tube portions including the ofiset portionof atleast one of.said adjoining tubes, said frame" being secured to tubes. at opposite sides of said opening; and a door'for said opening mounted on said frame andhaving a plug of heat insulating material arranged toprojectinto said passage when the door is in its closed position.

4. In; combination, a furnace wall having contiguous fluid cooled'tub'es' arranged'in a row, means defining an opening 'in'said'wallcomp'rising adjoining tubes of said row disposedonthesame side of said opening, eachof saidadjoining tubes having an intermediate offset portion formed by bends the aXes of .which lie in substantially a single. vertical plane, the vertical planesdetermined by the axes of the offset portions of said adjoining tubes intersecting each other at a point exteriorly of the furnace, a frame having an interior passage adapted to register with said opening and having portions thermally engaging portions of some of said fluid cooled tubes at opposite sides of said'opening," saidengaged'tube portions including the offset portion of; at'least one of said adjoining tubes, said frame being secured to'tubes at opposite sides of said opening other thansaid adjoining tubes, and a door for said opening mounted onsaid frame and havingaplug of heat insulating material arranged to project into said 2. In combination,- a furnace wall having contiguous fluid cooledtubes. arranged ina .row, means defining-an opening in said=wall.comprising adjoining tubes of. said row disposedonthe same side of: saidwopening, each' of said. adjoining, tubes having an intermediate offset portion formed. by bends theiaxes of which lie-in substantially a Single vertical plane, the vertical planes determinedby passage when the door is in its closed position.

References Cited in the file of this patent

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