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Патент USA US3034494

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May 15, 1962
3,034,485
R. H. EVANS ETAL
TUBULAR WALL CONSTRUCTION
Filed June 24, 1959
6 Sheets-Sheet 1
_
BY
INVENTORS
Rlchard H. Evans
Leslie R Purple
ATTORNEY
__
May 15, 1962
R. H. EVANS ETAL
3,034,435.
TUBULAR WALL CONSTRUCTION
Filed June 24, 1959
6 Sheets-Sheet 2
g plio/c
6 LT
.
“<5
——//9
_ INVENTORS
By
Richard H. Evans
Leslie P. Purple
ATTORNEY
May 15, 1962
R. H. EVANS ETAL
3,034,485
TUBULAR WALL CONSTRUCTION
Filed June 24, 1959
6 ‘Sheets-Sheet 3
,
IINVENTORS
v
Rlchard H.Evans
Leslle P. Purple
ATTORNEY
May 15, 1962
R. H. EVANS ETAL
3,034,485
TUBULAR WALL CONSTRUCTION
Filed June 24, 1959
6 Sheets-Sheet 4
_ INVENTORS
BY
Rlchard H. Evans‘
Leslie P. Purple
ATTORNEY
May 15, 1962
R. H. EVANS ETAL
3,034,485
TUBULAR WALL CONSTRUCTION
Filed June 24, 1959
6 Sheets-Sheet 5
May 15, 1962
R. H. EVANS ETAL
3,034,485
TUBULAR WALL CQNSTRUCTION
Filed June 24, 1959
6 Sheets-Sheet 6
F/G. 7.
INVENTORS
Richard H. Evans
BY
Lesl'ge‘P.‘ Purple
ATTORNEY
I
United States Patent 0
1 r.
1C€
1,
,
3,034,485
Patented May 15', 1962
2
vapor generating and the vapor superheating tube lengths;
3,034,485 '
and
TUBULAR WALL CONSTRUCTION
.
FIG. 7 is a sectional side elevation taken on the line
Richard H. Evans, Leatherhead, and Leslie P. Purple,
London, England, assignors to Bahcock & ‘Wilcox, Lim
ViI—Vll of FIG. 6.
'
‘ HQ. 1 shows an upper part of a furnace wall includ
ited, London, England, a company of Great Britain
ing vertically extending vapor generating tube lengths 101
Filed June 24, 1959, Ser, No. 822,481
Claims priority, application Great Britain Get. 17, 1953
7 Claims. (Cl. 122-510)
‘which over a lower part of the wall are tangentially ar
ranged and which are provided on their outer sides in
usual manner with buckstays (not show) by which the
This invention relates to tubular vapor generating and 10 tubes are maintained in alignment with one another and,
vapor heating units and ,more particularly to units
Where-bent from the plane of the wall, at their desired
adapted to generate steam at high pressures and to super ' > spacing. A nun sheet metal casing 1:12, FIG. 2A, is dis
heat the steam to high temperatures. In order to attain
posed on the side of the tube lengths 101 remote from
a required high temperature of superheat, the use of a
the furnace chamber 103 to preclude the escape of gases
section of radiant superheater may prove desirable or 15 ‘from the furnace chamber and is welded to channels 119
necessary. The section of radiant superheater may con
provided on certain of the tube lengths 101 at spaced
veniently be suspended from above but the temperatures
intervals. The tube lengths 101 are connected at their
and pressures to which the tubes of the superheater are
lower and upper ends to suitable inlet and outlet headers
raised render them liable to become distorted unless guide
(not shown) respectively.
'
or positioning means are provided.
20
An object of the invention is the provision of a fur
na'ce Wall including both vapor generating and vapor
superheating tube lengths, in which the superheating tube
lengths are maintained in position, but from which the
superheating tube lengths may readily be removed.
Superheating tube lengths 105, suspended from above
in conventional manner and extending down the upper
part of the furnace wall, are disposed in groups of six
at regular intervals across the furnace wall face. Thus
every fourth vapor generating tube length 101 (desig
25 nated 101D) remains in the general plane of the furnace
The above object and other features and advantages
wall. Of the three remaining tube lengths 101A, 101B,
are attained in a vapor generating and vapor heating unit
and 1tl1C in each set of four, the center tube length 101B
is bent outwardly from the plane of the wall at one level
and its two ?anking tube lengths 101A, 101C are bent
having a furnace chamber with a wall including ,a row
of upright vapor generating tube lengths with suitable
positioning means adapted to maintain the tube lengths in 30 outwardly in a similar manner at a somewhat lower level.
alignment with one another. Vapor superheating tube
The three tube lengths 101A, 101B, 101C above the
lengthsare disposed adjacent the vapor generating tube
higher of these two levels extend tangentially side by side
lengths and arranged to be exposed to radiant heat from
to the top of the furnace wall.
7
the furnace chamber, the superheating tube lengths be
Each group of six superheating tube lengths lies in
ing maintained in position adjacent vapor generating tube 35 one of the spaces so formed in the furnace wall face as
lengths by coupling means which accommodate axial
a straight row of tangentially arranged tube lengths hav
movements of the superheating tube lengths relative to
ing their sides towards the furnace chamber arranged co
the vapor generating tube lengths due to di?erential
planar with the furnace chamber sides of the adjacent
thermal expansion. The coupling means are such that a
vapor generating tube lengths 101D. The‘lower. ends
superheating tube length may be uncoupled from the 40 of the superheater tube lengths 105 are welded to hollow
vapor generating tube lengths by an axial movement fol
stubs provided on a distributor 1&6 and, with the tube
lowed by a movement inwards of the furnace chamber.
lengths 191A, 101B and 101C bent in this manner, aper
According to the present invention, a group of at least
tures 107, 108 and 109 (see FIG. 4) are left'respectively
two of the superheating tube lengths extends between
between tube lengths 101D and 101A, tube lengths 101A
two spaced vapor generating tube lengths and the cou 45 and 101C, tube lengths 101C and ltllD and these facili
pling means, including a runner member, connects to all
rate the passage of the tube lengths 105 through the fur
the superheating tube lengths of the group.
'
nace wall.
The invention will now be described, by way of ex
Thus, identifying the superheater tube lengths 105 of
ample, with reference to the accompanying partly dia
a group from left to right of FIG. 4 by the reference
grammatic drawings in which:
FIG. 1 isa view of a fragmentary part of the furnace
face of a furnace wall incorporating both vapor generat
ing and vapor superheating tube lengths.
FIGS. 2A and 2B are sectional side elevations of a
50 numerals 105A to 1055‘, tube lengths 105A, 105C extend
sidewardly through the aperture 107, tube lengths 1053
and 105E extend ?rst under the center vapor generating
tube 13113 and then through the aperture 108, while the‘
tube lengths 105D, 105E‘ extend sidewardly through the
fragmentary portion of the vertical lower and'upper parts 55 aperture 1S9. It will be noted that none of these tubes
respectively of the wall taken on the line II—-II of FIG.
rise towards the distributor 106, and therefore they can
1, FIG. 2B being drawn to a larger scale than FIG. 2A.
be fully drained.
FIG. 3 is a sectional plan view of a fractional part
The sheet metal casing 102 extending over the part of
of the wall taken on the line III-J11 of FIGS. 1 and 213.
the furnace Wall provided with the superheating tube
FIG. 4 is a sectional plan view taken on the line 1V—IV 60 lengths terminates above the distributor 106. To seal
of FIG. 1.
.
the Wall in the region of the distributor 106 against the
FIGS. 5 and 6 are sectional plan views similar to the
escape of hot furnace gases a two part cowl 117, 118 is
plan view of FIG. 3, but respectively showing two modi
?ed arrangements of positioning means coupling the
provided. Each part of the cowl is L-shaped in trans
verse cross-section. The upper part 117 is secured in’
3,034,485
means ‘133 passes over the tops of theguide'members
139 at each of the vertically spaced coupling means. The
bar 133A is then removed laterally enabling the second
tight manner to a Cl12111116l_'121 welded to the upper end
of a part of the casing 102 which extends below the dis
tributor 106 and'to a ?n 122 extending from the distribu
tor. Below the distributor 106 the casing is welded to
channels 121 welded to the'tubes 101. The ends of the
space between the cowls and the furnace wall are closed 10
in any suitable manner.
are of 11/2 inches outside diameter. .
bar 13313 to be moved in the direction of the furnace
chamber to disengage the stirrups 131 from the vertical
slots 144 and then withdrawn laterally from the stirrups.
The six superheating tube lengths are then unconnected
with one ranotherand can be replaced with new tube
lengths, by a reversal of the above process, these new
tube lengths then being welded at their ends to the stubs
’ In theiembodiment of the invention illustrated, the
vapor generating tube lengths 101,11‘ave an outside di
ameter of 3 inches, the superheating tube lengths 105
4
be swung forwardly into the furnace chamber 103., By
moving the superheating tube lengths upwardly, the bar
gas-tight manner to a channel 119 to which is welded the
lower end of the adjacent part of the casing 102, and part
117 is also Welded to a‘ ?n 120:extending from the dis
tributor 106. The lower cowl is similarly secured in gas
provided on the headers.
_.
'
'
'
i
‘
The arrangement shownin FIG. 5 is'applicable to a
15 furnace wall in which the superheating tubellengths ex
Coupling means for maintaining the superheating tube
tendnot only down an upper part of the furnace wall but
lengths in position adjacent the vapor generating, tube
also down to the foot of that wall. In such a case there is
. no need to bring the superheating tube lengths 105A’ to
1055" laterally out trough the wall between the vapor gen
lengths while accommodating axial movements of the
superheating tube lengths relative to the vapor generat
ing tube lengths due to differential thermal expansion are
indicated generally at 130 in FIGS. 23 and 3. Such cou
pling means are provided at vertically spaced intervals
along the superheating tube lengths, and in the embodi
ment illustrated occur at intervals of 8‘ feet.~
erating tube lengths. This then permits the three vapor
generating tube lengths 1101A’, 101B’ and 101C’ to re
‘ main quite close to the remaining vapor generating‘tube
-_ lengths 101D, giving a relatively thin wall. The vapor
generating tubeilengths 101A’, 10113’ and 101C’ are
Referring to the embodiment of FIG. 3, each coupling 25 spaced apart and diametrically opposite ?ns 301 provided
me'ans'comprisessix G-shaped stirrups or brackets 131: 1 on the tube length 101B and rearwardly directed ?ns 303
welded severally to, the six superheating tube lengths 105,
the stirrups extending away from the furnace chamber 103
' provided on the tubelengths 101D substantially close the
head portion 135 having near its opposite ends shoulders
137 facing the furnace chamber for engaging two guide
Of the six superheating tube lengths 105A’ to \105F',
tube lengths 105B’ and 105E’ are providedwith C-shaped
members 139 welded respectively to two of the vapor
stirrups 131 through whichris threaded a bar or runner
inter-tube-length spaces between the tubes 101 and thus
screen the thin metal casing ‘102 from heat radiated by the
and tie bar or runner means 133 extending through the
.
'
stirrups 131, the runner means 133 being formed with a 30 superheating tube lengths. '
generating tube lengths 101D. The guide members 139
133' having shoulders 137' arranged to contact guide
connected to tubes 101D extend toward one another to 35 members 139' Welded to the vapor generating tube lengths
101D. superheating tube lengths 105A’, 1050* are se
reduce the free space between these tube lengths. .
cured to superheating tube lengths 1105B’ by short lengths
7 Thus each guide member 139 is in, the form of 1a rec
of rod 305 which extend in the same direction as the
tangular strip having a thickness of 1/2 inch and 7 inches
long, the presence of these guide members thus reduc
tube lengths and are welded to' the tube length 105B’
ing the free space between the two-tube lengths 101]) in
the region of the coupling ‘means from 9‘ inches to 8
those tube lengths remote from the furnace chamber 103.
inches. The head portion 135 has an overall length of
' The guide member 139' is eight inches long and the cou
pling means are repeated at vertical distances of 8 feet.
8% inches. The space 143, FIG. 2B, inside each bracket
and either tube length 105A’ or 1105C’ on the side of
superheating tube lengths 105D’ and 105F' are similarly
or C-shaped stirrup 131 has a height of 31/2 inches and _
a depth of ‘2% inches, and the barpmeans 133 have a
height of 21/2, inches. The bar means is in the form of
two bars 133A and 133-B, the former being disposed closer
to the furnace chamber 103. The bar 13313 which is 1%
inches thick, forms the head portion 135 and is pro
vided on its outer side with three vertical slots 144 for
accommodating two of the stirrups 131. The bar 133A,
that nearer the furnace chamber, is % inch thick.
With the arrangement of vapor generating tube lengths
101 and superheating tube lengths 105 and coupling means
130 described above, the occurrence of differential thermal
expansion between two superheating tube lengths 105
of the same group is ‘accommodated by the arrangement
of C-stirrups 131 and the bar means 133; Diiferential
thermal expansion between the superheating tube lengths
coupled to superheating tube length 105E’. . Since the
. stirrups 131 do not ?t within grooves in bar .133’, this
bar may be slid freeof the stirrups once the superheating
tube lengths have been movedgupwardly and forwardly
into the furnace chamber, so releasing the tube lengths
570
105A’ to ‘10513’;
a
,
‘FIGS. 6 and 7 show an arrangement in which, of the
six superheating tube lengths 105A” to 105F", the center
four tube lengths 1053" to 105E” are provided with
brackets or G-shaped stirrups 131 ?tted severally into
slots 144" in bar 133B", and each of the end tube lengths
105A", 105F" is connected to the adjacent tube length
10513" or 105E" by hinges 461 arranged'with their axes
parallel to those of the tube lengths. Thus the hinge 461
joining lengths 105E”, 105F" comprises three tubular
105 and the vapor generating tube lengths 101 is accom 60 members ‘461A, 461B, 461C threaded on a hinge pin
461D secured by a weld 463' to the upper member 461A.
modated by sliding movement of the bar means 133‘ rela
The hinge ‘461 is disposed on the side of the superheating
tive to the guide members 139. Such movement will not
be suf?cient for the bar means to pass beyond the guide
tube lengths remote from the furnace chamber, the mem
members 139, so that at all times the superheating tube
bers 461A, 461C being welded to the tube length 105E"
lengths 105 are held in alignment with one another by
and the member 461A being welded to the tube length
the bar means 133 and held in place relative to the
105E". Apart from these features, the construction of
' vapor generating tube lengths 101 by the coupling means.
FIG. 5 is similar to that of FIG. 3 and the same numerals
When it is desired to replace one of the superheating
are used to denote similar parts.
.
tube lengths which has deteriorated in service, all six
In the various embodiments ofgthe invention described
tubes of that group are disconnected at their ends from 70
above the coupling means between the superheating tube
the associated headers or distributors, this involving
lengths and the vapor generating tube lengths permit dif
ferential thermal expansion of those tube lengths and'per
mit the removal of superheating tube lengths from the
so that the lower ends of the superheater tube lengths can 75 wall, after cutting of their ends, by a vertical movement
cutting ‘each tube length at each end adjacent, the stub
provided on the header. The superheating tube lengths
105 are then moved vertically upwards about three inches,
8,034,485
5
6
followed by an outward movement into the furnace cham
ber.
means accommodating longitudinal movement of said
vapor heating tubes relative to said vapor generating
tubes and to each other as occasioned by the differential
thermal expansion therebetween, said coupling means in
While the instant invention has been disclosed with
reference to a particular embodiment'thereof, his to be
appreciated that the invention is not to be taken as limited
to all of the details thereof as modi?cations and varia
tions thereof may be made without departing from the spirit or scope of the invention,
What is claimed is:
cludinga guide member attached to each of said generat
ing tubes so as to extend longitudinally thereof and in
wardly into the space formed between said generating
tubes to reduce the distance therebetween, a bracket con
nected to eachrof said vapor heating tubes on a portion
'
1. In a vapor generating and heating unit, a boundary 10
wall portion including a plurality of transversely spaced
longitudinally extending vapor generating wall tubes ar
ranged substantially tangent to the plane of said bound
ary wall portion, a plurality of longitudinally extending
vapor heating tubes occupying the space formed between 15
said spaced vapor generating tubes, said vapor heating
tubes having an outer side, a readily detachable coupling.
means for maintaining said vapor heating tubes in rela
tive alignment to each other and to said vapor generating
tubes, said coupling means including aligned brackets
mounted on the outer side of said vapor heating tubes,
and a tie bar slidably received in said brackets and having
end shoulder portions arranged to abuttingly engage said
spaced vapor generating tubes for guiding the movement
of said vapor heating tubes relative said generating tubes 25
during thermal expansion and contraction thereof.
2. The invention as de?ned in claim 1 wherein said
thereof opposite the portion thereof tangent to the plane
of said wall, and a tie means adapted to be slidably re
ceived in said brackets for maintaining said vapor heat
ing tubes in coplanar alignment, said tie means including
a bar means having shoulder portions to accommodate
said. guide members for maintaining said aligned vapor
heater tubes in position relative to said generating tubes.
6. In a vapor generating and heating unit, a tubular
Wall de?ning a boundary portion of a furnace chamber,
said tubular wall comprising a row of longitudinally ex
tending vapor generating tubes arranged substantially
tangent to the plane of said wall, a portion of some of
the vapor generating tubes in said row being outwardly
displaced out of the plane of said wall intermediate the
length thereof to form a space between a pair of'vapor
generating tubes extending in the plane of said wall, a
plurality of vapor heating tubes extending longitudinally
in said space between said vapor generating tubes, said
tie bar brackets have a C-shaped formation with opposed
leg portions connected to said vapor heating tubes.
vapor heating tubes being substantially tangent to the
plane of said wall and supported in said space independ
ently of said generating tubes, a detachable coupling
means for maintaining said vapor heating tubes in rela
tive coplanar alignment in the space formed between
said pair of vapor generating tubes, said coupling means
accommodating relative thermal expansion of said vapor
3. In a vapor generating and heating unit, a tubular
wall arrangement de?ning a boundary wall portion of a
chamber, said tubular wall including a pair of spaced,
longitudinally extending, vapor generating wall tubes ar
ranged tangent to the plane of said wall, a plurality of
longitudinally extending vapor heating tubes occupying
35
the space formed between said vapor generating tubes,
said vapor heating tubes being disposed substantially
means including aligned brackets connected to said vapor
heating tubes, a tie bar extending transversely of said
vapor heating tubes and slidably received in said brackets,
and said tie bar having end shoulder portions arranged
to abuttingly engage said spaced vapor generating tubes
for maintaining said vapor heating tubes in alignment
relative to each other and to said spaced vapor generating
tubes.
7. In a vapor generating and heating unit, a tubular
45 wall de?ning a boundary portion of a furnace chamber,
tangent to said plane of said wall, and coupling means to
maintain said vapor heating tubes in relative alignment
to each other and to said vapor generating tubes, said
coupling means accommodating longitudinal movement
of said vapor heating tubes relative to said vapor generat
ing tubes and to each other as occasioned by the differen
tial thermal expansion therebetween, said coupling means
generating and vapor-heating tubes, and said coupling
including a guide member attached to each of said gen
erating tubes so as to extend inwardly into the space
said tubular wall comprising a row of longitudinally ex
formed between said generating tubes to reduce the dis
tending vapor generating tubes arranged tangent to the
tance therebetween, a plurality of brackets, each of said
plane of said wall, a portion of some of the vapor gen—
backets'being connected to one of said vapor heating tubes
erating tubes in said row being laterally displaced out of t
on a portion thereof opposite that portion of the tubes 50 the plane of said wall intermediate the length thereof
tangent to the plane of said wall, and a tie means adapted
to form a space between a pair of vapor generating tubes
to be received in said brackets for maintaining said vapor
extending in the plane of said wall, said laterally dis
placed portion of the generating tubes extending longi
heating tubes in coplanar alignment, said tie means in
cluding a bar means having shoulder portions to accom
modate said guide members for maintaining said aligned
vapor heater tubes in position relative to said generating
tubes.
4. The invention as de?ned in claim 3 wherein said
bar means is provided with a plurality of notches longi
55
tudinally in a plane spaced from and substantially paral
lel to the plane of said wall outwardly of said chamber,
a plurality of vapor heating tubes extending longitudinal
ly in the space formed ‘between adjacent pairs of spaced
vapor generating tubes, said vapor heating tubes being
substantially tangent to plane of said wall and supported
tudinally spaced along the outer edge portion thereof 60 in said space independently of said generating tubes, and
readily removable coupling means for maintaining said
and adapted to embrace said brackets, and a second bar
vapor heating tubes in relative coplanar alignment in the
extending transversely within said brackets and disposed
space between said pair of vapor generating tubes, said
between the vapor heating tubes and said bar means to
coupling means accommodating for relative thermal ex
hold said bar means-in position.
5. In a vapor generating and heating unit, a tubular wall 65 pansion of said vapor generating and vapor heating tubes,
said coupling means including a guide member longi
arrangement de?ning a boundary wall portion of a cham
tudinally attached to the spaced pair of said generating
ber, said tubular wall including a pair of spaced, longi
tubes extending tangent to the plane of said wall, said
tudinally extending, vapor generating wall tubes arranged
tangent to the plane of said wall, a plurality of longi
guide means extending inwardly into the space formed
tudinally extending vapor heating tubes occupying the 70 between said pair of vapor generating tubes to reduce
space formed between said vapor generating tubes, said
the distance therebetween, a plurality of C-shaped brack
vapor heating tubes being disposed substantially tangent
ets, each of said brackets having opposed leg portions
to sm'd plane of said wall and coupling means to main
and a connected bight portion, and the leg portions of
tain said vapor heating tubes in relative alignment to each
each of said C-shaped brackets being connected to one
other and to said vapor generating tubes, said coupling 75 of said vapor heating tubes to form a closed loop there—
3,034,485
I
a
with, each of said brackets being connected in transverse
, alignment to a portion of said vapor heating tubes op
posite the ‘portion thereof tangent to the plane of said
wall, and a tietmveans adapted to be slidably received in
the loop’ formed by said brackets for maintaining said
vapor heating tubes in coplanar alignment, said tie means
v
,
8
'
remainder of said’ loop, said second bar including an ‘edge
portion tangent torsaid vapor heating tubes. _
w 7
. , References Cited in the ?le of this patent
UNITED STATES PATENTS
including a ?rst bar’ extending transversely through said
‘1,802,750
‘2,228,953’
Black _____, __________ -Q Apr. 28, 1931
Hackett _________ __.,__,___ Jan. 14, 1941
loops between said guide means and occupying only a
portion of said loopg'said ?rst bar including an edge
portion tangent to said displaced tubes, ‘and a second ‘bar’, 10
extending transversely ‘of said loops and occupyingvthe
2,244,144
Drewry ___'_' ________ __,__ June 3, 1941
2,354,222
2,681,641
2,834,324
Shellenberger _______-__V__ July 25, 1944
Andrew et a1. __,___'___'____ Iune_22, 1954
myr
Schoessow _____ _'_ ____ __ May 13, 1958
Haw;,v,
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