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Патент USA US2134000

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Oct. 25, 1938.
D, H_ N, MAYO,
Filed NOV. 28, 1934
6 Sheets-Sheet 1
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Oct. 25, 1938.
Filed Nov. 28, 1934
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Oct. 25, 1938.
Filed NOV. 28, 1954
6 Sheets-Sheet 4
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Oct. 25, 1938.
Filed Nov. 28, 1954
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Oct. 25, 1938‘
Filed Nov. 28, 1934
6 Sheets-Sheet 6
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Patented Oct. 25, 1938
Dana H. N. Mayo, Ridgewood, N. J., assignor to
rI’he- Babcock & Wilcox Company, Newark,
N. J., a corporation of New Jersey
Application November 28', 1934, Serial No. 755,078
3 Claims.‘ (Cl. 122—235)
This invention is concerned with wall construc
In a speci?c form it relates to improvements
in apparatus through .which ?uids or gases pass
5 at different pressures and temperatures. It is
Fig. 13, and looking in the direction of the ar
Fig. 15 is a partial section of a side wall.
Referring to Fig. 1 of the drawings, there is
shown a furnace from which hot gases pass across '
exempli?ed herein as a steam boiler heated by steam generating tubes and then through an
furnace gases at pressures differing to an unusual up-pass 20. Under the effect of the induced draft
' fan 22 the gases are next drawn through the
degree in adjoining gas passes.
The invention will be readily understood from down-pass 24 and the outlet 26 to the air heater
the description of the steam boiler shown in the 28. They are drawn through the fan and blown
through the exhaust conduit 30 to -a stack.
accompanying drawings, in which:
The gas pressures within the furnace and the
Fig. 1 is a vertical sectional view of a Water tube
steam boiler associated with a slag tap‘ furnace. gas passes are sub-atmospheric throughout, and
the pressure at the outlet 26 is much less than
Fig. 2 is a partial side elevation of the instal
lation of Fig. 1, showing the exterior of the boiler the pressure at the bottom of the up-pass. It 15
is also to be appreciated that these pressure re
casing and the position of the ?uid cooled parti
tion which extends through and completely sep
arates two parts of the casing.
Fig. 3 is a View in the nature of a section taken
20 on a horizontal plane at a level below that of the
boiler drum.
Fig. 4 is a partial View in the nature of an ele
vation, showing the wall or casing construction
at the juncture of the vertical and inclined parts
25 of the ?uid cooled partition.
Fig. 5 is a section on the line 5-5 of Fig. 4
showing the structure associating the vertical
part of the ?uid cooled partition with the high
temperature casing on one side and. the low tem
30 perature casing on the other.
Fig. 6 is a section similar to that of Fig. 5, but
taken on the section line 6—6 of Fig. 4, and show
ing the structure along the inclined part of the
?uid cooled partition.
Fig. 7 is a View on the line 1—'l of Fig. 8 in
the nature of an end elevation of the downtake
header side of’ the boiler, with the exterior cas-v
ing removed.
Fig. 8 is a section‘ taken on a plane indicated
by the section line 8-8 of Fig. 7.
Fig. 9 is a partial side elevation indicating the
relationship of the joint cooling tubes and the
lationships mustbe maintained if a uniformly
high combustion‘rate is to be effected in the fur
nace and a uniformly high gas velocity secured
in the gas passes. Any substantial gas leaks 20
from the up-pass directly into the outlet or into
the lower part of the down-pass would quickly
impair the effectiveness of the apparatus because
of the destructive action of‘ the high temperature
gases. Without said destructive action, such leak
age would result in e?iciency losses.
'The. gases in the up-pass have temperatures
higher than those in the down-pass, and hun
dreds of degrees higher than the water, or water
and steam mixture in the circulating system of 30
vthe boiler. Therefore, any physical parts of the
apparatus which are separately affected by these
different temperatures must be permited to have
relative movement. This invention involves parts
which cooperate to prevent the above described
destructive action, but are so situated that they
tend to separately approach the three different
orders of temperatures mentioned. One ofthese
parts is the casing section forming walls of the
up-pass 20, ‘and a second is the casing section
forming walls of the down-pass 24. The third
part is the ?uid cooled partition 32 which sep
downtake headers of the steam generating sec-I arates the casing sections and is movable rela
tive to them.
Pie U!
Fig. 10 is a section taken on the line IO-Hl of
Fig. 9, and showing the ?uid cooled expansion
joint seal at a corner‘ alongside the boiler down
take headers.
Fig. 11 is a partial side elevation indicating
The manner in which the casing sections are 45
related to the partition 32 is well illustrated in
Fig. 6, of the drawings. This ?gure indicates a
section through the junction of the casing sec-'
tions with the partition wallwhich is protected
on its up-pass side by cooling tubes 34 having'?ns
5.0 the construction at the boiler mud drum. '
v36 welded thereto. These ?ns afford supports for
Fig. 12 is a section taken on the line l2-l2 of ' the panels 38 and the interposed refractory 40.
Fig. 11 and showing the corner seal at a level
between the mud drum and the lower ends of the
downtake headers.
Fig. 13 is a view in the nature of an elevation,
showing the relationships of the parts near the
tops of the downtake headers. -
Fig. 14 is a view, partly in elevation and partly
.60 in vertical section, taken'on the line |4-—l4 of
At the edges of the partition the refractory '42
is additionally held in position and protected by
a welded ?n 44 preferably disposed at a right angle
to the ?n 36.
The seal tube 46 is preferably made rigid with
the partition by a Weld 48 secured to the panel
construction‘ or to a plate 49 rigid therewith.
Baf?e mix may be placed between this plate and 60
the tube, and in all similar sealing positions. This
tube also carries an expansion joint and gas seal
juncture of the vertical and inclined portionsiof
the partition 32.
structure including the angles 50, 52, 54 and 56
The partition cooling tubes 34 are connected
which are preferably rigid with a bar or ?n 58
vinto the boiler circulation as indicated in Fig. 2.
They, are directly connected at their lower ends 5
to the downtake headers H4, while the seal tubes
46 extend downwardly along the sides of the end
headers and are connected at their lower ends
to the mud drum H6, as shown particularly in
Fig. '7 of the drawings. The upper ends of all of
welded to the tube at 60. The angle 56 has one
?ange 62 welded to a ?llet 64 which is in turn
welded to the tube 46 and positioned parallel to
the ?n 58. Battle mix may be positioned between
the tube 46 and the?ange 62 as heat resisting
10 material also acting as a ?ller.
One ?ange of the angle 50 is parallel to the
?ange 62 and spaced therefrom to provide a pas
sage in which the ?ange 66 of the ?oating angle
may slide with a reasonably close ?t to prevent
15 excessive leakage of air into the furnace. The
to a header H8 which is located at the top of
the partition. This header is connected to the
steam space of the drum I20 by circulators I22.
other ?ange 68 of the ?oating angle ‘is guided
pended from the framework I24 by loops I26 and
between an inclined buckstay ‘I0 and a bar 12
?xed thereto. On the other side of the ?n 58
there is a similar arrangement of elements co
rods I28.
operating with the ?oating angle 14.
The buckstay "I6 preferably supports a wall ‘I8
which is a part of the casing section for the down
pass 24, and the wall 80, a part of the up-pass
casing section, which is thicker than the wall ‘I8
25 because it is exposed to furnace gases at higher
temperatures. The latter wall is guided by the
buckstay ‘I0, and an expansion joint gas seal is
provided between the buckstay and the wall. As
shown, this seal consists of wall members form
30 ing channels 82 and 84 which slidably receive
?anges 86 and 88 preferably secured, respectively.
to. the buckstay ‘I0 and the seal tube 46. The
flange 88 is apart of a ?oating angle the other
?ange of which slides in a guideway formed by
the'tube 46 and a' bar 90 spaced from the tube
but welded to it along one edge.
Sealing strips or clips 92 secured to the ?oat
ing angles 66 and “complete the gas sealing
structure. Asbestos packing may be placed un
40 der these strips and at all similar sealing posi
. It will be noted that the parts rigid with the
partition form therewith a complete wall ex
tending between and. completely separating the
45 confronting ends of the walls ‘I8 and 80.
expansion joint gas seals are separate and are
located on opposite sides of the partition. With
this arrangement of elements, gas leaks direct
from the up-pass 20 to the lower pressure down
50 pass 24 are prevented. In the event that a leak
occurs the gas movement will be from the at
mosphereinto the furnace and the wall parts
the tubes 34 and the seal tubes 46 are connected
The drum and the circulators are shown sus-‘ 15
In the up-pass and the down-pass separated
by the partition tubes 34 banks of ?uid heat
exchange tubes are shown. The cooler gases in 20
the down-pass contact with the tubes of the
economizer I30. These tubes are connected to
an inlet header which receives feed water from
any convenient source. At their other ends they
are connected to the water space of the drum 25
I20 through the intermediacy of the outlet head
er I34.
In the up-pass there are located two ?uid heat
ers I36 and I38. These heaters may be super
heaters connected in series-or in parallel, or one 30
of them may be a reheater. The tubes of these
heaters are shown extending through the ex
terior wall I40‘ of the up-pass 20 to inlet headers
I42 and I44 on one side, and to outlet headers
I46 and I48 on the other side. All of these head; 35
ers are preferably in vertical alignment and are
supported by the saturated steam tubes I50 and
I52 arranged in rows on opposite sides of the
header.’ These tubes are shown to be supported
by suspension rods I54 and I56 from the frame 40
work I24. They are connected at their lower
ends to the header I42 and at their upper ends
to the steam space of the drum I20.
The downtake headers I I4 are connected to the
water space of the drum I20 by downtake circu 45
lators I58 as shown in Figs. 1 and. 15 of the draw
ings. These circulators are preferably positioned
in two spaced rows where they cross thevoutlet 26.
With this arrangement there is no excessive flow
resistance imposed upon the gases by the down 50
take circulators. Along their upper parts they
support refractory material which forms the
will not be subject to the destructive action of rearward wall I60 of the down-pass 24.
_ As shown particularly in Figs. '7 and 8, the end
high temperature gases.
Fig. 5 of the drawings illustrates the manner downtake header is joined to thevseal tube at
in which the vertical section of the partition is intervals. This juncture is effected by ?ns I 62
associated with the separate casing sections. It and I64 which are welded together in overlapping
is similar to disclosure of Fig. 4 and will be . relationship as indicated more particularly in
readily understood to be a continuation of the Fig. 8. Fig. 10 also shows this structure in detail.
Fig. 4 structure. The wall 93 is in a somewhat Here, the seal tube 46 has metallic studs I66
welded thereto in radial positions and embedded
lower temperature gas zone than the wall 80, in refractory material I68 exposed to the furnace
and hence is not as thick. ,
gases at the juncture of the wall 80 and the wall
_ Fig. 4 illustrates the junction of the vertical formed by the inside surfaces of the downtake
buckstays H0 and H2 with the inclined buck
stays ‘I0 and 16. ‘These parts, as well as the
Oppositethe ?n I64 there is shown the expan
expansion joint parts between them, are shown sion joint ?n I10. The latter is preferably welded
as being mitered so as to form a single straight to the tube 46 and is positioned to have a sliding
?t within a passage I12 formed by the buckstay
line joint, butit is to be understood that sep
arate mitered sections of these parts might be I14 and the angle I'I6. This arrangement of
added to the joint so as to make it a two-line elements permits the pressure parts, including
joint. In this latter event the juncture of the the seal tubes and the downtake headers, to move
buckstays and their attached parts would ap
relative to the casing sections and the buckstays,
proach the curvature of the seal tube ‘46 which without excessive leakage of gases from the
75 is shown as having a gradual curvature at the furnace.
Fig. 7 shows the mud drum extending out be
yond the end headers I I4 for connection with the
seal tubes 46 and a blow-off connection I80.
wardly of these connections the mud drum is
joined with the separate headers II4 by nipples
I‘I8 which are preferably expanded into ?uid tight
relationship therewith.
As shown in Fig. 12 the nipples I18 have ?anges
I82 welded thereto at opposite sides. These
10 ?anges overlap ?anges I83 welded to the seal
tubes, and similar elements are provided through
out the length of the mud drum to complete a
wall which may maintain refractory material
similar to that shown at I68.
Fig. 12 also shows the angles I84 and I86 be
tween which the ?llet I88 may be welded to form
a closed passage receiving the ?n I10 with a slid
ing ?t and gas sealing relationship. These angles
are ?xed to a slotted buckstay I90 which appears
ported wall consisting of a metal panel section
256 and refractory material 258. This wall is
preferably supported upon the wall tubes 260
which are connected to the header 262. Extend
ing upwardly from the position of the member 5
252 is a part of the top supporting wall, including
a panel construction 264 and refractory 266. At
the junction of these two Walls the upper part
268 of the lower wall is shown as overlapping a
refractory footing 210. These parts are placed 10
and arranged as shown in order that the bottom
supporting wall may expand freely in an upward
What is claimed is:
1. In a water tube steam boiler, a horizontally 15
inclined bank of steam generating tubes, uptake
and downtake header constructions at opposite
ends of the tubes, a wall above said bank sub
jected to furnace gases at both sides, wall tubes
cooling said wall and connected to the down
The downtake headers are connected to the ' take header construction, a cross header forming
uptake headers I92 by horizontally inclined steam a mud drum extending transversely below the
generating tubes I93 which extend across the downtake header construction and extended be
path of hot gases passing from the furnace I96. yond the sides of said construction, means es
The latter is indicated as a slag tap furnace ?red tablishing direct communication between the
by burners I88 and 200 supplied with secondary cross header and the downtake header construc
air through the chamber 202. These burners tion, and tubes extending along the edges of said
preferably direct fuel streams between wall tubes wall and connected to the ends of the cross head
206 connected at their ends to headers 208 and ers extended beyond said construction, said lat
2I0. Similar wall tubes 209 join the headers 208 ter tubes being also otherwise connected into the
and 2I2 on one side of the furnace, and 2 I4 and boiler circulation.
2. In a water tube steam boiler, a steam and
2I6 on the other side of the furnace. The water
tubes are preferably covered with refractory as water drum, a bank of inclined steam generat
ing tubes, uptake and downtake headers at op
are the floor tubes 2I8. When a slag pool col
lects in the furnace it may be tapped through posite ends of said bank of tubes, means con
necting said headers to the drum, an angled bail‘le
the opening 220.
The headers 2I0 and 2I6 are connected into positioned above said bank of tubes so as to sep
the boiler circulation by tubes 222 and 224 and arate two gas passes and including parallel water
there may be similar tubes connecting the lower tubes extending from thetops of the downtake
headers with the drum I20. Similar connections headers toward the opposite side of the boiler and
226 and 228 are provided for the headers 230 then upwardly, said baffle including seal tubes
and 232 of a furnace screen formed by inclined having their upper ‘portions parallel to said water
tubes and their lower portions extending along
tubes 234 connecting the} headers 230 and 232.
The hot gases from the furnace pass through side the downtake headers beyond the lower end
the ?ue or outlet 26 to a dust hopper 240 located of the baflle, means connecting said water tubes
at the base of the air heater 28. Any material to the drum, means closing the spaces between
collecting in this hopper may be withdrawn the parallel water tubes and said additional tubes,
and a mud drum positioned below the lower ends
through the discharge tube 242.
of the downtake headers and connected to them,
Referring to Fig. 3 of the drawings the parti
tion 32 is shown between the front and rear walls the seal tubes having their lower ends connected
I40 and I60. Beyond the wall I40 is an exterior to the ends of the mud drum.
7 3. In a ?uid heat exchange system, upright
casing having the panel wall 244, and a similar
exterior casing wall 246 is shown spaced from sectional headers at one side of a gas pass, sec
tional side walls de?ning opposite sides of the
the wall I60. Fig. 2 shows a .side wall connect
gas pass, a convection section including a bank
ing the walls 244 and 246. It includes the buck
stays I I0 and H2 and other vertical members 248 of tubes connected to headers and extending
across the gas pass, a baffle wall extendingup
and 250 of an outside insulating panel wall con
struction as well as the horizontals 252, 254 and wardly above an intermediate portion of the
tubes of said bank and laterally outwardly beyond
the inner surfaces of said side walls, spaced wall
In the structure indicated in Fig. 2 of the draw
ings the exterior wall is preferably of insulating cooling tubes communicating with said headers
panel construction and the wall sections A B C D and de?ning said ba?le wall, side seal tubes paral
E, and F G H H’ I J K are unitarily suspended lel to wall tubes and positioned at the vertical
from the load carrying structure at the top of margins of the baffle wall, said seal tubes ex
the installation. These sections thus expand tending into spaces between confronting and ad
downwardly, as do the pressure parts of the boiler. jacent sections of the side walls and extending
Along the line K H’ H there is preferably located downwardly alongside the outermost of said
an expansion joint, permitting this expansion headers, means connecting the convection section
and the seal tubes into the ?uid circulation of the
and the upward expansion of the panel wall sec
tion L M O P R which is preferably supported system, and refractory means closing the spaces
between said wall tubes and between the wall
by the water tube side wall of the furnace.
tubes. and the seal tubes.
In Fig. 15 of the drawings the horizontal struc
tural members 252 and 254 are shown. Between
these members there is positioned a bottom sup
20 in both of Figs. 10 and 12.
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