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Патент USA US3060916

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Oct. 30, 1962
3,060,904
R. H. EVANS
VAPOR GENERATORS
Filed July 27, 1960
2 Sheets-Sheet 1
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INVENTOR.
Rlchard Henry Evans
BY
ATTORNEY
Oct. 30, 1962
R. H. EVANS ‘
3,060,904
VAPOR GENERATORS
Filed July 27, 1960
2 Sheets-Sheet 2
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. INVENTOR.
Richard Henry Evans
BY
ilnited I'tates Eatent
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Miéh?dd
Patented Oct. 30, 1962
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The invention has particular application to a forced
3,!!69994
Richard Henry Evans, Surrey, England, assignor to liab
VAPOR GENERATORS
cecir & Wiicox, Limited, London, England, a com
pany of Great Britain
?ow tubulous boiler having circuits connected in parallel
for the flow of Working medium and an upright furnace
chamber space with walls lined by tube lengths of the
circuits, wherein the tubulous lining has sections extend
Fiied July 27, 1960, Ser. No. 45,724
€Ilaims priority, appiication Great Britain .Fuiy 3t), 1959
5 ?lm’rns. (Cl. 122—235)
ing over respective zones one above the other and each
ample, in the superheater tubes of a natural circulation
of the said sets are connected with superjacent transfer or
formed by horizontal or substantially horizontal tube
lengths of the respective circuits arranged in groups pro
viding sets of adjacent tube length ends distributed around
This invention relates to vapor generators having wall 10 a furnace chamber space, the sets of tube length ends
tubes arranged to operate with forced ?ow of the work
each include inlet ends and outlet ends and upright trans
ing medium therethrough. Such tubes are found, for ex
fer' or connector tubes leading to the inlet ends of each
boiler provided with a superheater including tubes lining
'a furnace chamber wall area or in a forced ?ow, once
through'boiler with tubes lining furnace chamber walls.
More particularly, the invention is related to a forced
flow tubulous boiler having circuits connected in parallel
for flow of working medium and an upright furnace cham
connector tubes ‘leading from the outlet ends of the set,
15 the said transfer or connector tubes constituting part of
suspension means for the sections.
In one application of the present invention, as shown
in FIGURES l and 2, a group I of six upright transfer
or connector tubes 1A, 1B, 1C, 1D, 1E and IF, extends
ber space with walls lined by tube lengths of the circuits, 20 upwardly to one set 2 of six tube lengths 2A, 2B, 2C, 21),
wherein the tubulous lining has sections extending over
2E and 2F at a location and another group 3 of six
respective zones one above the other and each formed by
transfer or connector tubes 3A, 3B, 3C, 31), 3E and SF
horizontal or substantially horizontal tube lengths of the
extends upwardly from the other set 4 of six tube lengths
4A, 4B, 4C, 4D, 4E and 4F at the location. The sets 2
25 and 4 of tube lengths ‘extend horizontally in opposite
respective circuits, the tube lengths of the circuits being
distributed in the zones in a manner adapted to give-ap
proximately equal heat inputs to the circuits.
In a vapor generator with horizontal or substantially
directions from opposite sides of an aperture 5 which is
embraced by connecting means 6 mechanically connect;
horizontal furnace chamber wall tubes it is important
ing the respective groups 1 and 3 of transfer or con
that the tubes should be drainable and the mode of tube
nector tubes which extend upwardly to and upwardly from
displacement of contiguous tubes at necessary fluid heater 30 the said sets 2 and 4 of tube lengths. The connecting
cleaner or the like apertures in a wall normally employed
means 6 together with the groups 1 and 3 of transfer or
with vertical wall tubes cannot be used since there result,
connector tubes form parts of wall suspension means.
in tubes displaced in such manner, slugs of liquid which
The connecting means are of elongated diamond shape
cannot be drained.
in elevation, the diamond shaped elevation having its
The present invention comprises a vapor generator with 35 longitudinal axis vertical and being secured at its acute
drainable parallel tube circuits arranged for force flow of
the working medium therethrough and providing hori
zontal or substantially horizontal tube lengths lining a
furnace chamber or/ and gas pass wall area and so ar
ranged that sets of tube lengths extend in opposite direc
angled ends 6A and 6B by respective tie members 7 and
8 in the form of upright plates to cranked portions 9 and
_10 of the groups 1 and 3 of transfer or connector tubes.
The connecting means 6 are centrally apertured between
40 front and rear faces so that the access passageway 5 ex
tions at the wall from a location at which an aperture
tends normally or substantially normally to the sets 2 and
passes through the wall.
4 of tubes.
In one application of the invention each tube circuit
The tube lengths of the two sets 2 and 4 are so shaped
includes tube lentghs disposed at different heights in the
at their adjacent extremities as substantially to screen
wall, the circuits are so arranged that pairs of sets of 45 the connecting means 6 from the furnace. Thus, above
tube lengths extend in opposite directions from different
and below the aperture 5, corresponding tube lengths of
locations in the wall and at least at one of the said loca
the two sets 2 and 4, such as the tube lengths 2A and 4A
tions an aperture passes through the wall.
below the aperture, are at their extremities contiguous,
When apertures through the wall are required for the
as is seen in FIGURE 2, while, at the sides of the aper
passage of lances or sootblowers the required number of 50 ture 5, the extremities of corresponding tube lengths, such
apertures will be provided at locations chosen as suitable
as tube lengths 2, 2C, 4, 4C, as seen in FIGURE 2, are
for the lances or sootblowers.
The invention Will now be described, by way of ex~
appropriately spaced to help in de?ning an aperture 11
at the wall axially aligned with the passage 5 through
the member 6. Each tube length is connected to a cor
responding transfer or connector tube by a curved part
FIGURE 1 is an outside elevation of part of the wall
projecting away from the furnace chamber to a location
of a furnace chamber at a location where sets of hori
at a side of the connecting means 6 and downwardly or
zontal wall tubes enter and leave the wall by way of re
upwardly to the part of the transfer or connector tube
spective groups of upright transfer tubes and an access
welded to the connecting means 6. Thus the tube length
passageway for a sootblower is provided, the wall casing 60 26 is connected to tranefer tube 10 by a curved part
ample, with reference to the accompanying partly dia
grammatic drawings, in which:
being omitted;
FIGURE 2 is a setcion on the line 2-2 of FIGURE I,
viewed in the direction of the arrows, parts of the wall
casing and insulation being shown;
FIGURE 3 is an outside elevation similar to that of
FIGURE 1 showing two vertically spaced locations at
120 projecting away from the furnace chamber side of
the sets 2 and 4 of wall tubes, to a location at the side
of the connecting means 6 and then downwardly to con
nect by way of a cranked portion with the transfer tube
1C. The curved parts, such as the curved part 12C of
tube 2C, extend away from the furnace chamber hori
which access passageways for sootblowers are provided,
zontally or at such an inclination as to ensure drainability
tubes entering the wall at the lower location and leaving
of the tubes.
the wall at the upper location; and
FIGURE 4 is a section on the line 4—4 of FIGURE 3
viewed in the direction of the arrows, parts of the casing
As shown, on opposite sides of the connecting means
6, the'connections between the sets 2 and 4 of horizontal
wall tubes and the groups 1 and 3 of upright tube parts
and insulation being shown.
include upright tube parts such as 1D’, 1E’, 1F’, 3Df,
'
3,060,904
3E’, and 3F’ which extend parallel or substantially paral
lel to the upright axis of the diamond shaped connecting
means 6. It will be appreciated that these portions on
opposite sides of the connecting means could be bent to
follow the sloping sides of the connecting means to pro
A
tubes of the groups 31 and 35 associated with correspond
ing sets. 33 and 37 of tube lengths at the two locations,
and the other member 42 being welded to the cranked
parts 32A and 36A of the transfer or connector tubes
of the groups 32 and 36 associated with the other corre
vide better cooling thereof, while maintaining the free
drainability of the tubes.
sponding sets 34 and 38 of tube lengths at the two loca
Referring to FIGURE 2, the transfer tube parts sur
At the apertures 43 and 44, the tube lengths of adja
rounding the connecting means 6 are enclosed by an ex
tions.
.
cent sets and the associated transfer or connector tubes
tension 13 of the skin casing 14 of the Wall tubes. The 10 are formed in a similar manner to that described above
extension 113 is connected at its inner edges to the casing
in connection with the embodiment of FIGURES 1 and
14 by suitable ?exible sealing strips 15, and has upright
2. Thus the tube lengths of the sets 33 and 34, and of
sides 16 and upper and lower parts, corresponding to the
the sets 37 and ‘38 are so shaped at their adjacent ex
contours of the cranked portions 9 and 10 of the groups
tremities as substantially to screen the parts of the con
of transfer tubes as indicated in FIGURE 1 by broken 15 necting means 39 adjacent the apertures 43 and 44 from
lines 17.
the furnace. Above and below each of the apertures 43
At the outer end of the connecting means 6, the exten
and 44, corresponding outermost tube lengths of the sets
sion 13 is provided with a ?at closure plate 18, secured to
are contiguous at their extremities, while at the sides of
the extension and to the connecting means 6, the plate 18
the apertures extremities of corresponding tubes are ap
.being centrally apertured at 19 to expose the access pas 20 propriately spaced to help in de?ning the associated aper
sageway 5. Suitable removable closure means, in the
ture. Each tube of the sets 33, 34, 37 and 38 is con
form of a cover plate 25 suitably secured, as by bolts,
nected to a corresponding transfer tube of the associated
to the member 6, are provided for closing the passageway
group by a curved part projecting away from the furnace
5 on withdrawal of a sootblower tube. The extension 13
chamber to a location at a side of the tension member
and the casing 14 are provided externally with a layer 25 41 or 42 remote from the apertures. The curved parts of
of heat insulating matetrial 20 in normal manner.
the tube lengths extend away from the furnace horizontal
The invention has particular application to a boiler
ly or at such an inclination as to ensure drainability of
wherein the furnace chamber includes a ?ring zone at
which at least one furnace chamber wall is provided
the tube lengths.
,
At the apertures 43 and 44, respective aperture de?ning
with burner ports in the neighborhood of which the wall 30 plates 45 and 46 are provided, welded at their peripheries
is lined with a group of upright tubes and pair of hori
to the tube extremities bounding the associated apentures.
zontal or substantially horizontal tube lengths lining the
The plates 45 and 46 are centrally apertured and at the
walls between the sides of the group or groups of up
apertures inner ends of respective access tubes 47 and
right tubes are so arranged that the tube lengths of each
48 are connected to the plates, the tubes 47 and 48
pair extend 'in opposite directions from each of the adja
extending outwardly normal to the wall and between the
cent pairs of ends which are substantially equidistantly
tension members 41 and 42 of the connecting means 39.
spaced from opposite sides of the group of upright tubes
The tubes 47 and 48 terminate at their outer ends ad
or from adjacent sides of different. groups of upright
jacent outer edges of the tie members 41 and 4-2, to which
tubes and each tube length of the pair extends to and
the tubes are Welded and are suitably welded to an outer
from one of the said sides.
Clearly such a construction
may be modi?ed by substituting for each pair of hori
casing part 49, as seen in FIGURE 4, which serves to
provide a closure to the skin casing 50 of the furnace
zontal or substantially horizontal tube lengths a pair of
Wall. The casing part 49 comprises an upright vertically
sets of horizontal or substantially horizontal tube lengths.
elongated U section casing member having side parts 51
Moreover, a similar construction may be adopted, for
embracing the parts of the ‘transfer tubes on opposite
example, at an upper region of a furnace chamber from 45 sides of the connecting means 39. Inner edges of the
which extends a lateral gas pass, thevadjacent pairs of
side parts 51 are suitably connected with the skin casing
sets of ends then being substantially equidistantly spaced
from the gas outlet from the furnace chamber or from
the gas outlet from the lateral pass.
In another application of the present invention shown
in FIGURES 3 and 4, groups 31 and 32 of six transfer
or connector tubes extend upwardly to respective sets of
tube lengths of two sets 33 and 34 of six tube lengths at
one location, groups 35 and 36 of six transfer or con
nector tubes extend upwardly from respective sets of tube
lengths of two sets 37 and 38 of six tube lengths at a
second location immediately above but spaced from the
50 by upright V section ?exible sealing strips allowing
relative horizontal movement between the side parts 51
and the skin casing 50. Above and below the connecting
means 39, the casing part 49 is suitably connected to
respective vertical casing parts serving to encase the up—
right transfer tube groups 35 and 36, and 31 and 32.
At the outer ends of the access tubes 47 and 48, the casing
part 49 is suitably apertured for access to the tubes which
provide access means for sootblower tubes. Removable
closure means, in the form of cover plates 26, are suit
ably provided and secured at the outer ends of the access
?rst location and connecting means 39 embrace respec
tubes'47 and 48, for closing the apertures on removal of
tive apertures 43 and 44 at the locations. The connect
the associated sootblowers.
,
ing means 39 extend past tube lengths 40 of other sets 60
It will be appreciated that an access aperture need not
of tube lengths intermediate the two locations and me
be provided at both locations of an arrangement such as
chanically connect the respective groups 31 and 32, and
is described in connection ‘with FIGURES 3 and 4, but
35 and 36 of transfer or connector tubes which extend
may only be provided at one of the locations. It will
upwardly to the sets 33 and 34 of tube lengths at the
be understood that, in such circumstances, the tube lengths
?rst location and upwardly from the tube sets 37 and 65 at the location where no aperture is provided will be
38 at the second location and the connecting means 39
contiguous at their extremities.
and the groups 31, 32, '35 and 36 of transfer tubes to
It will be appreciated that when the transfer or con
gether form part of wall suspension means.
The connecting means 39 comprise two spaced parallel
nector tubes serve as part of the suspension means of a
wall, the upright transfer or connector tubes are ar
tension members 41 and 42 in the form of plates extend 70 ranged in vertically extending sets distributed around the
ing normally to the wall and vertically between cranked
furnace chamber. It therefore follows that the locations
parts 31A, 32A, 35A and ‘36A of respective groups 31, 32,
chosen for the apertures may be selected from locations
35 ‘and 36 of transfer or connector tubes to which the
distributed at frequent intervals both across the Wall and in
members are welded, one member 41 being welded to the
the height of the wall. It will be further understood
cranked parts ‘31A and 35A of the transfer or connector 75 from the above description that the apertures are pro
3,060,904
5
vided without interfering with the drainability of the wall
tubes.
'
My invention may also be applied to a tubulous natural
circulation boiler having an upright furnace chamber the
walls in the lower region of which are lined with upright
vapor generating tubes and the walls in an upper region
of which are lined with vapor heating tubes connected in
a number of parallel circuits each of which includes hori
zontal or substantially horizontal tube lengths arranged
in zones one above the other in a manner adapted to re
sult in approximately equal heat inputs to the circuits,
the said tube lengths being supported by upright tubes
6
3. In combination with a wall including a vertical
row of contiguous horizontally extending drainable ?uid
cooled tube lengths arranged for parallel ?ow of ?uid
therethrough and providing a boundary for a chamber
con?ning high temperature gases, means forming an open
ing in said wall and comprising two sets of said tube
lengths extending in opposite directions and disposed on
opposite sides of said opening, each of the tube lengths
of both of said sets having one end disposed contiguous
10 to said opening, a frame having an interior passage adapted
to register with said opening, a ?rst group of upwardly
extending ?uid cooled connector tubes disposed in most
part exteriorly of said wall and about one side of said
connected in circuit with the upright vapor generating
tubes. It will be appreciated that the present invention
frame and directly connected to said one ends of one of
may be applied in the said upper region in the provision 15 said sets of tube lengths to provide continuity between
of apertures {through the furnace chamber walls.
each connector tube and its corresponding tube length,
While in accordance with the provisions of the statutes
a second group of upwardly extending ?uid cooled con
I have illustrated and described herein the best form and
nector tubes disposed in most part exteriorly of said wall
mode of operation of the invention now known to me,
and about the opposite side of said frame and directly
those skilled in the art will understand that changes may
connected to said one ends of the other set of tube lengths
be made in the form of the apparatus disclosed without
to provide continuity between each connector tube of
departing from the spirit of the invention covered by our
said second group and its corresponding tube length,
claims, and that certain features of my invention may
means for supporting said sets of tube lengths including
sometimes be used to advantage without a corresponding
means mechanically connect-ing said frame to said ?rst
use of other features.
What is claimed is:
1. In combination with a wall including a vertical row
of contiguous horizontally extending drainable ?uid cooled
25 and second groups of connector tubes, and closure means
for said opening associated with said frame.
4. In combination with a wall including a vertical row
of contiguous horizontally extending drainable ?uid cooled
tube lengths arranged for parallel ?ow of ?uid there
tube lengths arranged for parallel ?ow of ?uid there
through and providing a boundary for a chamber con
30 through and providing a boundary for a chamber con
?ning high temperature gases, means forming an opening
?ning high temperature gases, means forming an open
in said wall and comprising two sets of said tube lengths
ing in said wall comprising two sets of said tube lengths
extending in opposite directions and disposed on opposite
extending in opposite directions and disposed on opposite
sides of said opening, each of the tube lengths of both
sides of said opening, the tube lengths of one of said sets
of said sets having one end disposed contiguous to said 35 having their inlet ends disposed contiguous to said open
opening, a frame having an interior passage adapted to
ing, the tube lengths ‘of the other of said sets having their
register with said opening, a ?rst group of upwardly ex
outlet ends disposed contiguous to said opening, a frame
tending ?uid cooled connector tubes disposed in most
having an interior passage adapted to register with said
part exteriorly of said wall and about one side of said
opening, ‘a ?rst group of ?uid cooled connector tubes
frame and directly connected to said one ends of one of
disposed in most part exteriorly of said wall and about
said sets of tube lengths to provide continuity between each
‘one side of said frame and extending upwardly to and di
connector tube and its corresponding tube length, a sec
ond group of upwardly extending ?uid cooled connector
tubes disposed in most part exteriorly of said wall and
about the opposite side of said frame and directly con
nected to said one ends of the other set of tube lengths
to provide continuity between each connector tube of said
second group and its corresponding tube length, and
closure means for said opening associated with said frame.
2. In combination with a wall including a vertical
row of contiguous horizontally extending drainable ?uid
cooled tube lengths arranged for parallel flow of ?uid
rectly connected to the inlet ends of said one set of tube
lengths to provide continuity between each connector
tube and its corresponding tube length, a second group of
?uid cooled connector tubes disposed in most part ex
teriorly of said wall and about the opposite side of said
frame and extending upwardly from and directly con
nected to said outlet ‘ends of said other set of tube lengths
to provide continuity between each connector tube of
said second group and its corresponding tube length, and
closure means for said opening associated with said frame.
5. In combination with a wall including a vertical
therethrough and providing a boundary for a chamber
row of contiguous horizontally extending drainable ?uid
con?ning high temperature gases, means forming an open
cooled tube lengths arranged for parallel ?ow of ?uid
ing in said wall and comprising two sets of said tube 55 therethrough and providing a boundary for a chamber
lengths extending in opposite directions and disposed on
con?ning high temperature gases, means forming a ?rst
opposite sides of said opening, each of the tube lengths
opening in said wall and comprising two sets of said
of both of said sets having one end disposed contiguous
tube lengths extending in opposite directions and disposed
to said opening, a frame having an interior passage adapted
on opposite sides of said opening” means forming a sec
to register with said opening, a ?rst group of upwardly 60 ond opening in said wall at a higher elevation than said
extending ?uid cooled connector tubes disposed in most
?rst opening and comprising another two sets of said tube
part exteriorly of said wall and about one side of said
lengths extending in opposite directions and disposed on
frame and directly connected to said one ends of one of
opposite sides of said second opening, the tube lengths of
said sets of tube lengths to provide continuity between
said ?rst named sets having their inlet ends disposed
each connector tube and its corresponding tube length, a 65 contiguous to said ?rst opening, the tube lengths of said
second group of upwardly extending ?uid cooled con
second named sets having their outlet ends disposed
nector tubes disposed in most part exteriorly of said wall
contiguous to said second opening, a ?rst frame having an
and about the opposite side of said frame and directly
interior passage adapted to register with said ?rst open
connected to said one ends of the other set of tube lengths
ing, a second frame having an interior passage adapted to
to provide continuity between each connector tube of 70 register with said second opening, a ?rst group of ?uid
said second group and its corresponding tube length,
cooled connector tubes disposed in most part exteriorly
means for supporting said sets of tube lengths including
of said wall and on opposite sides of said ?rst frame
means mechanically connecting said ?rst and second
and extending upwardly to and ‘directly connected to said
groups of connector tubes, and closure means for said
inlet ends of said ?rst named sets of tube lengths to pro
opening associated with said frame.
75 vide continuity between each connector tube and its cor
3,060,904
responding tube length, a second group of ?uid cooled
connector tubes disposed in most part exteriorly of said
Wall and on opposite sides of said second frame and
extending upwardly from and directly connected to’ said ‘
outlet ends of said second named sets of tube lengths 5
to provide continuity between each connector tube of said
second group and its corresponding tube length, and ciosure means for each of said openings associated with the
corresponding frame.
References Qited in the ?ie‘of' thisipatent
m
' UNITED STATES PATENLS
2,125,557
Jackson _____________ __ Aug 9, 1938
2’357’302
Kerr et a1‘ """"""" " Sept‘ 5’ 19%
2,896,591
Schmedter —--, ————————— -— July 23, 1939
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