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Патент USA US2131080

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Sept. 27,1938.
Q s_ TURNER-
‘2,131,080 '
STEAM GENERATING AND SUPERHEATING APPARATUS
Filed Dec. 17, 1954 v
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‘ Sept. 27, 1938.
‘2,131,080
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STEAM GENERATING‘AND ~SUPJ‘EIEJH-IEATING APPARATUS
Filed Dec. 1'7, 1954
7 Sheets-Sheet 2
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Sept. 27, 1938.
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STEAM GENERATING AND SUPERHEA'II'ING APPARATUS
F/‘iled Dec. 17, 1954 '
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‘STEAM ‘GENERATING AND SUPERHEATING APPARATUS
Filed Dec. 17, 1954
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Sept. 27, 1938.
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STEAM GENERATING AND SUPERHEATING APPARATUS
Filed Dec. 17, 1934
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STEAM GENERATING AND SUPERHEATING APPARATUS
INVENTOR. '
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Sept. 27, 1938.
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2,131,080
STEAM GENERATING AND SUPERHEATING APPARATUS
Filed Dec. 1'7, 1954
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ATTORNEY .
2,131,080
Patented Sept. 27, 1938
UNITED STATES PATENT OFFICE
2,131,080
STEAM GENERATING AND SUPERHEATING
APPARATUS
Charles S. Turner, Detroit, Mich.
Application December 17, 1934, Serial No. 757,741
15 Claims. (Cl. 122-481)
A further important object is the provision of
This invention relates to heat absorbing and
vapor generating apparatus, and although par
ticular consideration is given to water tube steam
boilers, it will be seen to be readily adaptable
5 to other heat exchanging apparatus. An im
portant object of the 'invention is the provision
of improved means for conducting steam, or other
fluid to be heated, transversely through a bank
or screen of tubes spaced on close centers, such
10 as constitute the so-called water walls which
frequently form part of the generating system
of a boiler,
In the past, in boilers of the variety incorpo~
rating water walls, it has been considered im
possible from a practical standpoint to introduce
cross tubes through that portion of the furnace
bounded by the water walls, for the reason that
the water wall tubes have been commonly spaced
too close together to permit the projection. of
20 cross tubes of suitable size therebetween. It is
often desirable, however, that a slag screen be
positioned in a portion of the furnace directly
above the ?re and appurtenant that part of the
combustion chamber ordinarily bounded by such
25 water walls. It has further been recognized that
such position would be an ideal one for a radiant
an improved hollow Wall block for supporting
the tubes of a water wall, which wall block is
formed to also support and serve as a connecting
manifold for transverse superheater or slag tubes ~
5
extending through and across the space between
oppositely disposed Water walls bounding a com
bustion chamber.
'
A further object is the provision of' improved
means whereby transverse superheater assem
blies of the character indicated may be supported
by and projected across and through vertical
water wall assemblies yet allowed to expand and
contract independently of the water walls through
_ 15
.which they extend.
Still another object is the provision of improved
manifold and header means for such a radiant -
superheater assembly, so arranged as to provide
double pass of steam to be superheated across the
space between and through the water walls.
‘
A still further object is the improvement of
the water protected and regulated superheater
constructions disclosed in my co-pending patent
applications, Serial Nos. 512,675, and 590,108,
?led January 31, 1931 and February 1, 1932, re 25
spectively,- and the provision of novel means
superheater, provided practical means were avail
whereby superheaters incorporating the inven
able for protecting such superheater against
tions therein disclosed may be projected through '
burning out. Slag screens in the form of simple
water tubes have in the past been so positioned
by running the water wall tubes to lesser heights
than those to which they would otherwise extend,
and projecting the slag screen tubes across there
above, but as a practical matter it has been found
35 impossible to either extend the slag screen tubes
across and through the water wall itself, or to
similarly inter?t and adequately protect the tubes
of a superheater positioned in like fashion in the
combustion chamber and extended through wa
40 ter walls.
An important object of this invention, there
fore, is to provide means whereby protected radi
ant superheater tube assemblies and/or slag
and across the space bounded by vertical water
walls in the portion of a furnace directly above
the ?re.
It is also an object to provide in such con
structions a novel combined wall block and head
er arranged to conduct steam or otherv ?uid
(either or both) longitudinally and laterally
through the spaces between water wall tubes and
to and from conductors located inside the area
bounded by the water walls.
I further aim to provide an improved water
cooled and regulated superheater tube assembly
in which a novel arrangement of tubes pro
vides for protection of the steam tubes by the
water tubes at one stage of operation, and pro
screen tubes may be projected directly across and v tection of the water tubes by the steam tubes at
45 through the water wall portions of a furnace,
in such manner that steam and water fed to
and taken off from said tubes pass directly
through and substantially perpendicular to the
water walls, without interfering with the action
,50 of or flow in the water walls and in a manner
another stage.
'
Other objects and advantages will be apparent
from the following description wherein reference
is made to the accompanying drawings illustrat
lng preferred embodiments of my invention and
wherein similar reference numerals designate
allowing full and unrestricted ?ow through the similar parts throughout the several views, '
In the drawings:
superheater and/or slag screen elements; as well
Figure 1 is a somewhat diagrammatic vertical
as to allow the provision of a superheater of the
sectional elevation of a “straight through” cross
indicated character of virtually any desired ca
55 pacity, or a slag screen of any desired size.
drum boiler incorporating vertical water walls
45
2
..
2,131,080
bounding the combustion chamber, in which the
principles of my invention are applied in the in
stallation of slag tubes projected directly through
the water walls and across the combustion cham
ber.
Figure 2 is a fragmentary vertical section show
ing a portion of the water wall in elevation, taken
substantially on the line 2—2 of Figure 1 and
looking in the direction of the arrows.
Figures 3 and 4 are horizontal and vertical sec
tions respectively, taken substantially on the lines
3—3 and 4-4 respectively of Figure 2 and looking
in the direction of the arrows.
Figure 5 is a fragmentary View similar to Fig
15 ure 2 of another form of my invention applied
to a superheater construction.
Figure 6 is a vertical section taken substantially
on the line 6—6 of Figure 5 and looking in the
20
direction of the arrows.
Figure 7 is an enlarged cross section of one of
the superheater elements, taken substantially on
the'line 'l-—'| of Figure 6.
Figure 8 is an enlarged side elevation, vpartly
broken away, of the upper end of a somewhat
25 modi?ed superheater installation.
Figure 8a. is a detailed section taken sub
stantially on the line 8la—8a.‘ of Figure 8.
Figure 9 is a view similar to Figure 8 show
ing a suitable lower end construction for such a
30
superheater.
Figure 10 is an end view taken substantially as
indicated by the arrow I0‘ of Figure 9;
Figure 11 is a cross section of one of the super
heater units, taken substantially on the line
35 ll—ll of Figure 9, and looking in the direction
of the arrows.
Figure 12 is a cross section taken substantially
on the line l2-l2 of Figure 9, and looking in the
direction of the arrows;
Figure 13 is a fragmentary assembly view show
ing in side elevation and somewhat diagram
matically a superheater construction of this
character and the appurtenant furnace portions
and connections.
Figure 14 is a cross section taken substantially
on the line I4—I4- of Figure 13, and looking in
the direction of the arrows.
Figure 15 is a view similar to Figure 9 of an
other and modi?ed lower end construction usable
50 in such a superheater.
Figure 16 is a vertical section taken substan
tially on the line l6-|6 of Figure 15 and looking
in the direction of the arrows, showing also» a
45
somewhat
modi?ed tube assembly
structure
55 which may be used; and
Figure 1'7 is a cross section taken substantially
on the line I1—l1 of Figure 15 and looking in
the direction of the arrows.
Referring now to the drawings, Figure 1 will
60 be seen to show a cross drum boiler of well
known form, serving to illustrate a typical ?eld of
application of my invention. The furnace is
shown provided with a grate 21 adapted to sup
port a ?re bed, the combustion chamber 25 be
65 ing bounded by water walls formed by tubes
28-29, while boiler tubes 30 extend across. the
top of the combustion chamber in conventional
fashion, between inlet and outlet headers 3l-32.
combustion chamber, other portions have been
illustrated somewhat diagrammatically. The
water wall tubes 28-29 are shown as discharg
ing at their upper ends into headers 31-38, and
supplied at their lower ends through water inlet 5
header 3!}. As indicated in Figures 2 and 3, the
spaces between the water wall tubes are narrower
than their outside diameters, so that it would be
impossible to project simple cross tubes of like
size through the spaces between them. The 10
water wall tubes are shown supported and
shielded principally by wall blocks 42 of con
ventional construction, which may be cemented
to the tubes in the customary fashion and bolted
in place as by means of studs 44 and straps 45 15
or in any other usual or suitable manner.
Spaced at desired intervals and similarly sup
ported among the conventional wall blocks 42 are
special hollow blocks 50 arranged in opposed
pairs in such manner as to support between the 20
elements of each pair one or more slag screen
water tubes as 52 projected across the combus
tion chamber therebetween and secured to and
opening into the interior of the blocks, as by
being terminally ?tted into suitable (undesig- v25
nated) openings in ‘the exposed faces of the
blocks, to which they are welded as at 53. Such
slag screen cross tubes are ordinarily spaced
farther apart than are the tubes of the water
wall, and the special hollow blocks are of course ~30
only used at the locations in which it is desired
to place cross tubes, but however spaced and dis
posed, the special blocks preferably conform in
external contour to the regular blocks 42, at least
in their back portions which engage the water4=35
wall tubes, and are held in place similarly to
assist in the support and protection of the wa
ter wall tubes, as by studs 58 and straps 59.
The fronts of the blocks, facing the combustion
chamber, are of course considerably wider than 40
their rear faces, which are limited by the spac
ing of the water wall tubes, and in order to
provide full flow through the spaces between such
tubes, and unrestricted supply to and offtake
from the cross tubes, I preferably elongate the 45
special blocks vertically, thus lengthening ver
tically that portion of the hollowed chamber
therein extending between the adjacent water
wall tubes, and providing a relatively narrow
passage 54a of extended height connected to and .
forming part of the interior chamber 54, as best
50 "l
shown in Figures 3 and 4. To the rear faces of
blocks 50 a plurality of tubes as 55-65 may be
connected, projecting rearwardly into supply and
o?take headers, as 56 and 51. The manner in 55
which these are arranged and held in place (as
by welding, at 58—69) is best shown in Figure 4
showing the inlet end on a larger scale. The out
let end and connections may of course be similar
ly arranged. The use of a plurality of connect-"60
ing tubes 55-65 enables handling the full capac
ity despite the restricted size of the tubes, which
is of course limited by the width of the portion
54a.
The inlet header 56 is shown as connected to 65
a mud drum 39 of the water wall, while outlet
header 5‘! conducts the steam generated in the
slag screen tubes 52 to steam drum 34 through a
A steam drum 34 serves to collect the steam gen
connecting pipe 6|.
erated in the boiler, while the ?ue 35 is located
directly above a portion of the combustion cham
her.
Since the present invention is primarily con
cerned with those portions of the furnace con
taining the vertical water walls and bounding the
It will be appreciated that by virtue of this~70
construction it is possible to project not only slag
tubes, but tubes of virtually any desired char
'
acter through closely spaced water wall tubes,
without interfering with free ?ow through either,
and in» a manner permitting the useof cross tubes-#75
2,181,080
of capacity as great as or greater than the water
wall tubes. The sizes of the chambers in the
hollow blocks may of course be varied as desired,
and the number and proportions of the connect
ing tubes changed in accordance with the capac
ity of the cross tubes.
_
Figures 5, 6 and 7 disclose another applica
tion of certain of these principles, enabling in
stallation of a water regulated superheater in a
The
superheater shown is of the general construction
and intended to be operated in the manner dis
closed in my copending applications Serial Nos.
10 ?re chamber surrounded by water walls.
15
20
25
30
35
40
‘
'
>
3
ing off the saturated steam generated in the wa
ter tube, and for feeding into tubes 11 the steam
to be superheated.
_
A throttle valve as 85 is disposed in the water
inlet, and may be automatically regulated in re
sponse to the effluent steam temperature as by
means of thermostat 86, acting through valve“
regulating means diagrammatically illustrated at
81, connected to and controlled by the thermo
stat.’ The valve is so constructed and the regu
10
lating means so adjusted that during normal
steam?ow the water in the central tube 16 is I
held at a reduced level (or, more properly, “effec
512,675 and ‘743,068, ?led January 31, 1931 and tive level”) in said tube 16, but within the com
September 7, 1934, respectively. The vertical bustion chamber, while the proportions and rela
15
water wall tubes are designated 28a, and the con
tive positionings of the tubes 16-" and of the
ventional solid wall blocks by which they are heat bridging weld portions 18 are such that in
principally supported and shielded 4211; At suit
those parts of the superheater units wherein
able intervals, and preferably intersp-aced with water (principally) is contained in the central
the solid wall blocks, are a plurality of hollow tube, the absorption of heat from the exterior
wall blocks 50a so positioned in pairs on oppo
surface by such water is sufficiently rapid to carry
site sides of the combustion chamber as to be ' away virtually all the radiant heat impinging
adapted to support between them one or more upon the surface, and so prevents superheating
water regulated superheater tube assemblies, as of steam within the tubes 11 in such area. Above
T5, projected across the combustion chamber the water lever, however, the central tube con
25
and disposed at an angle to the horizontal,
tains practically nothing but saturated steam,
Each superheater unit consists of a central
(and that in reduced quantities due to the low
tube 76 having a ?uted exterior, the peripheral water level) the heat absorbing power of which
?utes being proportioned to accommodate a plu
is insufficient to conduct away more than a very
rality of longitudinal tubes T! which are ?tted small proportion of the radiant heat impinging
30
thereinto and welded in place, as at 18. As is
upon the exterior. Superheating accordingly
best shown in Figure 7, the weld portions 18 takes place in such portions, and it will be ap
bridge the spaces between the outer tubes 17 parent that by so throttling the water supply as
and integrate them with the peaks of the ?utes, to change the water level within the central tubes
providing integral heat bridges between such 16, the effective superheating area may be varied
tubes and the central ?uted tube along such and the temperature of output steam thereby 35
welded paths only, while since the inter?tted por
controlled. The thermostat and valve regulating
tions between the welds are non-integral, the mechanism may be so arranged as by varying
cleavage between them prevents ready heat this level to maintain any desired output steam
transference therebetween. The flutes and the temperature, or valve 85 may, if desired, be regu
tubes Tl ?tted thereinto are preferably helically lated by hand.
spiralled about the central tube to equalize the
Preferably hand operating means as 89 is pro
radiant heat impingement on and heat absorp
vided whether or not thermostatic regulation is
tion in the several tubes 11. Tubes 11 are ordi
45 narily used for the conduction of steam to be
superheated, while the water or other ?uid for
temperature control is passed through the cen
tral tube 16.
The inlet and outlet ends of the superheated
50 assembly may be of similar construction. One
end (the lower or water inlet end) only is there
fore illustrated in Figure 6. As there shown,
the water tube '16 may be projected directly
through the wall block 500. and connected to- a
55 water supply pipe as '19, while the steam tubes
‘ll may open into an inner chamber as 80 within
the block, to which are connected steam tubes
81. It will be seen that the tubes 76—8I may be
arranged in vertical alignment and so accom
60 modated in the narrow space available at the
rear of the block, while the frontal area of the
blocks and so the proportions of the superheater
unit connected thereto may be of virtually any
desired size, being limited only by the maximum
65 practicable size of the face of the block.
Al
though the steam may be run in either direction
through the steam tubes 11, it will be assumed
that in construction shown in the drawings, the
steam to be superheated is fed downwardly
70 through steam pipes 8| and then into outlet
steam header 82, while the water for tempera
ture regulation is fed into the same end of the
assembly through pipe 16-19. At the other
(higher) end of the assembly (unshown), like
75 coupling arrangements may be provided for tak
incorporated, in order that upon starting the,
boiler, before steam in normal quantities has
begun to flow through the superheater tubes 11, 45
the central tube ‘16 may be completely ?ooded and
the superheaterthus protected againstdestruc
tion during the period of high heat before the
commencement of steam ?ow. When steam
commences to ?ow, such hand regulated portion,‘ 50
which constitutes a bypass, may be closed, where
upon evaporation within the central tube will
quickly reduce the level therein to the proper one
to provide the superheating area which will fur
nish output steam at the proper temperature, 55
which level will be maintained and varied by the
thermostatic regulating means to hold the super
heated steam at the set temperature. Although
differences in constructional features and appa 60
ratus and installation will be perceived, the de
scribed method of operation will be recognized
as that disclosed and claimed in my copending
application Serial No. 512,675, ?led January 31,
1932, issued May 14, 1935, as Patent No. 2,000,906. 65
A somewhat modi?ed superheater, shown in
Figures 8 to 14 inclusive, comprises one or more
superheater units each constituted of alternate
water and steam tubes 16b and 11b assembled
in the manner best indicated cross sectionally 70
in Figure 11. As there shown the steam tubes
11b are provided along opposite sides ‘with re
entrant channels so proportioned that when two
of ‘such tubes are arranged side by side with the
channels in opposed parallelism, a water tube as 75
23313086
16b of suitable size may be ?tted therebetween
and in-the'space formed. by the opposed channels
in such manner as torbe almost but not quite
completely enclosed. .The space remaining, de
?ning the-spacing of adjacent steam tubes by the
wall .blocks are such that an enlarged head por
inter?tted water» tube, is preferably closed by
tion projects into the combustion chamber and
welds as 1812- which are thus disposed at and com
overhangs the water wall tubes to assist in shield
ing said‘ tubes and provide the required header
plete‘ the surface of the assembly. The welds
also provide integral‘ heat bridging means be
10 tween the outer surfaces and those portions of
the enclcsedwater tube nearest thereto, while the
cleavage between the other inter?tted but un
connected portions (1%) of the water and steam
tubes prevent ready heat‘ exchange therebe
1:5 tween.
In the unit shown in Figure 11 four of such
channeled steam tubes 11b and ?ve of the inter
?tted Water tubes 16b are incorporated. The
outer faces of the end water tubes 16?) are
20 shielded by a plurality of smaller steam tubes as
90, which are welded thereto and to the adjacent
steam tube 11b in a manner clearly shown in the
25
formed as- vertically elongated hollow wall blocks
shaped to ?t between and welded to the water
wall tubes 28b; as at 53b. The cross-sectional
contour and internal construction of the hollow
capacity, while a thinner tapered or “?sh-tailed” , ,
rear portion of each projects through the space
between adjacent water wall tubes 28b to con
duct steam and cooling water through the space
between the tubes of the water walls. The steam
tubes terminate in and are welded to openings
(undesignated) in the exposed faces of the com
bined header and wall block elements H5, H6,
as'at I5I. To the rear and opposite ends of the
thinned back portions of the header blocks sup
ply and olf-take steam pipes I20-I2I are welded
or otherwise connected, which pipes are ?attened 20
as shown in Figures 8a and 13 to conform in
width to the narrowed rear portions of the header
drawings, and for a purpose which will presently
appear.
blocks.
The vertical elongation of the superheater unit
by arranging the tubes one above another in
portions I64>of header blocks II5-I I6 which pro 25
ject through and‘ from the water wall an outlet
water header as I65 is shown carried, being in
dicated as secured thereto by ?shplates I66 and
this manner facilitates the use of tubes which
are small enough to enable the assembly to slid
ably ?t between the water wall tubes through
30 which and the furnace wall the unit is to be
Upon the aligned vertically extending back’
clamping bolts I67. The sides of portion I64 are ,
grooved as at 20I to receive the angular ?anges
installed, while yet providing the desired super
202 which extend along the edges of the fish
heating surface in a most compact form. Such
superheating surface is of course Variable by
plates, and apertured as at 200 to provide com
municating channels for the water tubes 161),
varying the number or tubes in a unit as well as
which are projected through the hollow interior __
by varying the number of units, while the effec
tive surface may be subjected to constant con
trol by water level regulation as in the embodi
ment previously described.
of the header blocks and into sealed engagement‘ 35
with such channels. The channels in turn ter
minate in open ends in the rear wall of portion
I04, against which end wall a similar cooperat
ing‘ coupling portion I69 is carried by the header
Two such units are shown arranged in series
40 in the embodiment illustrated in Figures 8 to 14
inclusive, which serially arranged-units are gen
erally designated I00 and IIlUd. They are prefer
ably disposed at an angle to the horizontal, and
may be longitudinally slidable with respect to
V45 the furnace and water walls at least at one end,
as above stated, to allow for expansion and con
traction.
Slidability of the units at their lower ends is
provided by allowing the tube assemblies to slide
50 freely between the water wall tubes 28!), and in
suitable openings (undesignated) in the wall of
the furnace. The slidable support at this end
may be-furnished by a pad as I0l, welded to the
bottom of the portion which‘ projects through the
wall, the pad being in turn slidable in the wall
upon a cross beam- I02 having a suitably inclined
top web. The lower ends of the steam tubes
which project from the furnace wall support
and are connected by a ?oating vertical cross
header H35, in openings (undesignated) in which
they are welded or otherwise suitably sealed, as
at I06. The cross header will presently be de
scribed in greater detail.
At their upper ends the steam tube 111) of one
65 unit (the upper in the shown construction)’ are
connected to an inlet steam header H5, while
the steam tubes of the lower unit‘ I00a discharge
into outlet header II6, from which the super
heated steam may be delivered' to its destination
through a ‘steam pipe as‘ I21. The steam to be
superheated may thus be conducted from header
H5 downwardly through unit I00 and cross
header I05 tounit I000 through which it' ?ows
upwardly to discharge header “6-.
The inlet and outlet-headers I’I-5'eI-I6 are-shown
I65 and provided with registering apertures 205,
adapted to be clamped in coacting relation in
the manner clearly shown in Figure 14. The
joint so formed may be ground or gasketed as at
201. The discharge from the water tubes of all
of the tubes I'I6 of both units is thus handled 45
vby the single outlet header I65.‘ Such discharge,
which is ordinarily saturated steam, may be con
ducted to the steam drum of the boiler (un
shown) or other desired destination through
steam coupling I19.
50
A water inlet header I I0 is carried at the lower
end of the assembly by the ?oating cross header
I05‘, being mounted on the back of such header
in the manner best shown in Figures 9 and 10.
Headers I05, I I0 are provided with ?anges as II2 55
through which bolts III are passed to secure
them together. The walls formed by such flanges
are apertured as at II 3, I I4 to tightly receive the
ends of water tubes 16b, which are projected
therethrough into sealed engagement with they 60
water header. Water is supplied through sup
ply pipe ‘I9b, (Figure 13) and through the agency
of a thermostatically or otherwise suitably con
trolled‘ throttle valve as I23 the in?ow of cooling
water‘ may of course be regulated to hold the‘ 65
water at a reduced level within the assembly but
inside the zone of heat absorption, as in the em
bodiment previously described, providing similar
water-regulated action. The entire assembly of
headers I'05'-I I0 at the‘ lower end ?oats with the 70
free lower ends of the units which are free to
move longitudinally under expansion and con
traction, and beam element I02 may be contin
ued’ and snugly ?tted about all sides of the ele
ment to frame‘ it closely‘ enough to prevent un
75
2,131,080
desirable air leakage, as shown in Figure 12, the
framing portion I02 being bolted as at 581) to
What I claim is:
ears 5% welded to the water wall tubes 28b. '
The smaller steam tubes 90 carried along the
exposed edges of the units are so proportioned
that the heat paths to the water tubes to which
they are welded, from their areas most remote
therefrom are short enough to allow complete
absorption by water within water tubes of all
10 radiant heat impinging upon steam tubes 90 when
the latter are empty of steam.
The possibility
»
1. In a boiler, in combination with saturated
steam generating means and a source of water
supply, a water wall structure including a plu
rality of spaced tubes arranged appurtenant a
heating chamber, a water-regulated superheater
comprising a tubular assembly extended at an
angle to the horizontal across said heating cham
ber and having combined supporting and supply
portions connected thereto and mechanically 10
connected to the water wall'and also provided
with coupling portions connecting them outside
the chamber to said saturated steam generating
of building up dangerous temperatures which
might destroy the steam tubes 90 is thus obviated
by the protection afforded them by the water
15 tubes. On the other hand, however, the steam
tubes 90, when steam is ?owing therethrough in
means and said source of water supply, and
normal amounts and the water level is reduced
in the water tubes to which they are welded, pro
I 2. In combination with a furnace having a
assistingin holding the Wall structure against
outward movement.
j
'
combustion chamber and water walls bounding
the same, said Water walls comprising a plurality
would otherwise be likely to occur because of of spaced tubes arranged in common planes
the presence of insufficient saturated steam spaced from each other across said combustion
therein, the units being normally so designed chamber, tubular heat absorbing elements of
(for obvious reasons of economy) that during greater width than the spacing between said
ordinary operation at full steam flow the water water wall tubes, said heat absorbing elements
25 level is at a very low point and almost the entire extending across the combustion chamber be
surface of- the superheater thus rendered active, tween spaced portions of saidwater walls, and
while the quantity of saturated steam generated means supporting the tubular heat absorbing ele
is also reduced due to the small quantity of water ments and for providing ?uid conductive con
tect the water tube against destruction, which
present.
30'
35
40
45
50'
55
,
20"
nection thereto through said water wall, compris
In Figures 15 to 1'7 inclusive another modi?~ ing hollow supportingblock elements having pore a
cation somewhat similar to that last described 'tions thinned and extended through the spaces‘
is shown, in which at the lower end of the as
between said water wall tubes but elongated in
sembly a similarly elongated combined wall block the direction in which said tubes extend, cou
and header portion I60 is provided which serves pling means connected to said thinned portions
as a cross header connecting the steam tubes
outside the water walls, said heat absorbing ele
Ill-I90 of the upper and lower units ZOO-200a ments being connected to and supported by said
respectively, in a manner analogous to the con
elements inside the water walls.
nection between units lll0-I Ulla provided by head
3. In combination with a furnace having a
er H15 in the embodiment last described, al
combustion chamber and water walls bounding
though it will be appreciated that inthe present the same, said water walls comprising a plurality 40
instance the steam is transferred directly through of spaced tubes certain of which are arranged in
the hollow interior of element I60, ‘which is lo
separate wall formations spaced from each other
cated partly inside the combustion chamber and across said combustion chamber, tubular heat
generally in a common plane with rather than absorbing elements of greater width than the
outside the water wall.
spacing between said water wall tubes, hollow
The water inlet header I650 may be carried by supporting block elements having portions 45
and. on the back of the steam cross header I500 thinned sufficiently to extend and extended
in similar fashion to the method of securing the through the space between the water wall tubes
upper water header to the backs of the aligned but elongated in the direction in which said tubes
inlet and outlet headers H5, H6, as shown in extend, said block elements being opposedly ar
Figure 17, in which View parts analogous to those ranged across the combustion chamber, and said 50
previously described have been given like refer
heat absorbing elements being supported and con
ence numerals with the addition to each of the nected to said block elements inside the water
letter “0”. Detailed re-description is accordingly walls and extending across the combustion cham
believed unnecessary. It will be understood that ber at an angle to the horizontal, and coupling
when the header assemblies are carried by the means outside the combustion chamber connect 55
water wall tubes at both ends, as contemplated ed to said thinned portions of the block elements
in this embodiment, the superheater assemblies for providing fluid conducting connections
may be of greater width. As indicated in Figure
16, their proportions might be such that they
4. As a new article of manufacture, a shielding
could not be ?tted between the water tubes 280 wall block for spaced generallyparallel water
by which the header block [600 is carried, and wall tubes and the like, said block having a face
this embodiment is accordingly especially suited portion wider than. its rear portion and the latter‘
thereto.
for use where the water wall tubes are spaced
65 on unusually close centers.
Whichever embodiment of cross header is used,
a drain for condensate is preferably provided, as
at lTlb-l‘l'lc.
While it will be apparent that the illustrated
70 embodiments of my invention herein disclosed
are well calculated to adequately ful?ll the
objects and advantages primarily stated, it is to
be understood that the invention is susceptible
to variation, modi?cation and change within the
75 spirit and scope of the subjoined claims.
‘
_
adapted to extend, between such tubes, the in
terior of the block having a hollowed chamber
extending from said wider face portion through
65
said narrower rear portion, said face and nar
rowed rear portions having coupling openings
therein communicating with said chamber, for
conducting ?uid through the spaces between said
tubes, the opening in the narrowed rear portion
being elongated in the direction of extension of
the
tubes.
'
>
'
5. As a new article of manufacture, a shielding
wall block for spaced generally parallel water 75
6
2,131,080
wall tubes and the like, said block having a face
portion wider than its rear portion,_the narrower
rear portion being adapted to extend between
such ‘tubes, the interior of the block being hol
lowed and the face of said block being provided
with a plurality of openings between which the
hollowed interior provides a communicating
chamber which extends longitudinally of and be
tween such tubes.
10
6. In combination with a furnace having a
‘ heating chamber through which gases of com
bustion may travel in a predetermined direction,
a. water-regulated radiant superheater assembly
extending across said heating chamber and across
15 the path of gas travel at an angle to the hori
conducted transversely through the spaces be
tween said water wall tubes.
7
11. In combination with a boiler,‘ a combustion
chamber, water walls bounding said chamber in
cluding a plurality of spaced water wall tubes
lying substantially parallel to the direction of
travel of heated gases from the combustion cham
ber, anda water~regulated superheater construc
tion including a tube assembly extending across
thecombustion chamber at an angle to the hori 10
zontal, steam and water headers connected to the
ends of said tube assembly, the tubes of said
assembly comprising superheating steam tubes
and water-regulating tubes'metallically integral
with each other and arranged in generally 00-‘ 15
zontal, said assembly comprising’ alternated
steam and water tubes and having avwater tube
planar relation, the planes of said assemblies
along its edge ?rst contacted by the gases, and a
travel, and means for conducting fluid to and
plurality of smaller steam tubes carried by and
arranged to shield that surface of said Water tube
which would otherwise be exposed to such gases,
said smaller steam tubes being integrated to such
surface whereby an unbroken heat bridge is pro
from the tubes of said 'superheater .assembly
transversely through the spaces between said 20
vided between them and said water tube.
'
25
7. In combination with a boiler, a combustion
' chamber, walls bounding said chamber including
a water wall comprising a plurality of spaced
being substantially parallel to the paths of gas
water wall tubes.
-
’
12. In a boiler, in combination with saturated
steam generating means and a source of water
supply, a water wall structure including va vplu
rality of spaced tubes arranged appurtenant a 25
heating chamber, a water-regulated superheater
comprising a tubular assembly extended at 1an
tubes, a water regulated superheater construction 7 angle to the horizontal across said heating cham
including a plurality of substantially parallel tube
extending across the combustion
30 assemblies
chamber at an angle to the horizontal, headers
connected to each end of ‘said assemblies ar
ranged outside said walls and connected to the
assemblies through said spaced tubes, said tube
35 assemblies extending transversely with respect to
tween the water wall tubes.
35
‘ the water wall tubes and being secured thereto
13. Heat absorbing apparatus comprising in
at one extremity, and at the other extremity
slidable therethrough.
combination with a plurality of spaced tubes ar-'
ranged around a substantially enclosed area,
tubular heat absorbing elements of greater width
than the spaces between saidtubes and'extending 4.0
across said area,»and coupling portions for said
elements having portions of reduced width to‘
8. In combination with a boiler, a combustion
40 chamber, walls bounding said chamber including
a water wall comprising a plurality of spaced
' tubes, a water regulated superheater construc
tion including a plurality of substantially par
allow their projection, and being projected,
allel tube assemblies extending across the com
through the spaces between said tubes, and por
tions carried by said coupling portions outside 4.5
and overhanging the backs of said tubes to brace
45 bustion chamber at an angle to the horizontal,
headers connected to said assemblies arranged
outside said walls and connected to the assemblies
through said spaced tubes, the assemblies being
interspaced with relation to the tubes, and the
50 portions extending between the latter being slida
ble with relation thereto at least at one end, the
header portions overhanging the outside of said
water wall to brace the same against explosion
pressures.
55
ber and having combined supporting and supply
portions connected thereto and mechanically 30
connected to the water wall to assist ‘in bracing
said water wall structure, and also to support said
assembly, said portions being reduced in width
in their parts extending through the ‘(spaces be
9. Superheating apparatus as set forth in claim
8 in which said tube assemblies comprise alter
nate steam andrwater tubes welded together to
form individual wall sections, and said wall sec
tions are positioned within and across the com
60 bustion chamber with their, general planes par
allel to the direction of gas travel.
10. Superheating apparatus as set forth in
claim 8 in which said tube assembliescomprise
alternate steam and water tubes welded together
65 to form individual wall sections, and said wall
~ sections are positioned within and across the
combustion chamber with their general planes
parallel to the direction of gas travel, and to the
direction in which the water wall tubes extend,
70 ?uid for the tubes of said wall sections being
the same against outward movement.
14. Heat absorbing apparatus comprising in
combination with a water wall portion including
a plurality vof spaced ‘tubes arranged around a' 60.
chamber, tubular heat absorbing elements vex
tending across said chamber and having con
necting portions projected through the spaces
between said tubes, and being carried by said
Water wall portions and provided withholding 55
means to assist in the bracing-of said water wall
portions.
.
15. Heat absorbing apparatus comprising in
combination with a plurality 'of spaced tubes'ar
ranged around a substantially enclosed area, 60
tubular - heat
absorbing
elements
extending
across said area and having connecting portions
projected through the spaces between'said tubes,
and portions carried by said connectingportions
outside and overhanging the backs of said‘tubes 65
to brace the same against outward movement,
the connecting portions and said elements being
supported by the tubes.
‘
CHARLES S. TURNER.
70
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