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Патент USA US2114224

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April 12, 1938-
D. s. JACOBUS
2,114,224
STEAM BOILER
Original Filed Jan. 2, 1955
v n ,-
.
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Daxigcl SJacobus
.’
Aiioney
2,114.22
Fatentee‘l Apr. E2, 193%
UNITED STATES PATENT OFFICE
2,114,224
STEAM BOILER
David S. Jacobus, Montclair, N. J., assignor to
The Babcock & Wilcox Company, Newark,
vN. J., a corporation of New Jersey -
Original application January 2, 1935, Serial No.
121. Divided and this application May 21,
1936, Serial No. 80,963
16 Claims. (Cl. 123-325)
visions for this purpose are incorporated in the
upper part of each drum 51. A steam and wa
ter separator 40 consisting of a twin. arrange
generating units, and more particularly to gen
erating units’having one or more water tube steam ment of inclined corrugated plate separator sec
‘boilers of the bent tube type including steam ‘ tions extends longitudinally of the drum 51 at
opposite sides of the. vertical axial plane there
heating surface and steam and water separat
of and between the discharge of the circulators
ing provisions.
One object of my invention is the provision 55' and one or more steam outlets 11. The steam
and water separator illustrated is similar to that
of improved steam heating provisions charac
disclosed in a patent of James Fletcher No.
terized by an effective arrangement of the super
heater tubes relative to gas flow, low pressure 2,007,966, granted July 16, 1935. Steam wash
drop in the superheater, and an improved sup ' ing nozzles are arranged in front of each separator section along the length thereof to pro
porting arrangement in a boiler; of the charac
vide a sheet of feed water across the inlets of
ter described.
‘
.
‘
.
A further object is an improved arrangement the separator sections.
The furnace 55 is heated by a pair of oppo
of the circulators for furnace wall heating sur
sitel'y arranged underfeed stokers 55 at opposite
face in a steam generator having two or more
sides of a central ash pit 51. The furnace is
steam boilers receiving heating gases from a com
mon furnace, one of the boilers including steam desirably completely water cooled, rows of ver
tical. tubes 55 extending along its sides directly
heating surface.
_
The various features of novelty which char ' below the boiler units-with the tube row at each
side supported from the corresponding drum 55
acterize my invention are pointed out with par
ticularity in the claims annexed to and forming and connected into the corresponding boiler cir
culation by having its upper ends connected to
a part of this speci?cation. For a better under
the corresponding drum 55 above the normal wa
standing of the invention, its operating advan
tages and speci?c objects attained by its use, ter level therein and its lower ends connecting
reference should be had to the accompanying to the corresponding drum 55 through pipes 59.
drawing and descriptive matter in which I have The portions of the tubes 55 in front of the tubes
illustrated and described a preferred embodiment 50" are bent and spaced to provide a slag screen.
The two remaining sides of the furnace are
of my invention.v '
The figure shown is a partly diagrammatic also provided with water wall sections consist
sectional elevation illustrating ‘one embodiment ing of interconnected bottom headers 19 and top
headers 11 connected by block-covered tubes 12.
of my invention. _
.
_
In accordance with my invention the headers 15
The steam generating unit illustrated com
prises a pair of water tube boiler units above and are connected only to the left hand boiler through
at opposite sides of a common furnace 55. Each downcomers 13 from the mud drum 58 and the
of the boiler units comprises a pair of "upper headers 1| by riser tubes 14 to the steam drum
steam drums 55 and -51 and a lower or mud drum 55 above the normal water level therein.
The superheater included in the left hand boil
55. The drums 51 and 55 are connected by a
substantially vertical bank of tubes 59, while er occupies the space between the ba?les 5| and
53 and will be protected to a large extent from
the drums 55 and 55- are connected by a. di
the radiant heat of the furnace by the ballle 5|
vided bank of tubes 55 arranged in three sec
tions 55‘, 55b, and 55°. Most of the .rows of and intervening tubes. The superheater com
tubes 50“ and 50” are eliminated in the left hand 1 prises an- external inlet header 15 receiving steam
boiler unit and the space occupied by a. return from the drum‘ 51 through conduits v11. The
header 15 is supported as shown by tension mem
bend superheater vhereinafter described. Ver
tical baffles 5|, 52, 53 and 54 are arranged along ‘bers 15 ‘from the setting and aids in‘ supporting
the tube banks to provide a plurality of serially the superheater. The superheater tubes 19 ex
connected passes for heating gases from the tend downwardly from the header 15 in two lon
furnace 55. The drums 55 and 51 are connected gitudinal rows at opposite sides of and support
by only steam circulators 55, and each drum 51 ing the baffle 52. At their lower ends adjacent
thev ba?le 53 the tubes 19 are bent rearwardly
is elevated above the corresponding drum 55.
and extend upwardly into the space between the
> The elevated position of the rear drums 51
provides an adequate space for washing and dry- , baffles 52 and 53 in a return bend nested for
My present invention relates in general to the
construction and operation of high capacity steam
5
10
_
)- l C)
35
40
45
_
50
55 ting the steam generated in the boilers and pro
.
15
35
45
50
mation providing a‘ double ?ow path through as
'2
amazes
each coil in the rear section of the superheater.
Each pair of nested tubes is connected adjacent
' the drum 56 by a Y-fltting 80 into a single tube
8| which extends downwardly along the baiiie
63 to a point adjacent the mud drum 58 and
thence upwardly along the ba?le Si in successive
rearward bends in the space between the baffles
I claim:
I
,
1. A steam generator comprising a furnace, a
plurality of steam generating units having sepa=
rate water circulation systems‘ and arranged at
opposite sides of and receiving heating gases from
said furnace, one of said generating units includ
ing only water heating surface and another gen
SI and 62, terminating in an external outlet
header 82 mounted on the right hand drum 56.
The tubes in each section of the superheater are
thus arranged in a series of parallel flat coils
erating unit ‘including both water heating and
steam heating surface, water heating surface lin
with a double flow through each coil in the rear
section and a single flow through each coil in
nace wall water heating surface into the circula
the front'section. The superheating surface is
15 thus divided into two groups, with the total steam
flow area in the group nearer the furnace with
respect to heating gas flow less than in the other
group. With the described steam ?ow through
the superheater, the pressure drop will be sub
20 stantially lower than if a single flow through
out ‘each coil were employed, and yet a high
velocity steam ?ow will be maintained through
the superheater tubes adjacent the furnace.
The tube legs in each coil and corresponding
25 coils in the front and rear sections are united
in a unitary self-supporting formation by lugs
83 connecting the otherwise unconnected ends
of adjoining tube legs. The unitary coil struc~
tures so formed are supported at their up
30 per ends by'the header l6 and connections 84
between brackets on the first upper looped por
tion of the tube at and the-underside of the
drum 56 and at their lower ends by lugs 85 lat
erally supported by lugs 86 mounted on the up
35 per side of the mud drum 58. With this arrange
ment the superheater coils will be free to expand
downwardly relative to the mud drum.
Each of the boiler units is provided with a top
heating gas outlet flue 8B controlled by dampers
40 89, the position of which may be varied to regu
late the heating gas flow through the correspond
ing boiler unit and thereby control the degree of '
steam superheat. In this construction the boiler,
superheater and furnace wall heating surface
45 is arranged and proportioned in such a way that
by regulating the flow of heating gases through
. the two boilers a uniform temperature of super
heated steam may be obtained over a wide range
of load conditions, with substantially the same
draft losses at full load through the boilers and
the same heating gas exit temperatures at ap
proximately half-load.
In the type of steam generator shown the‘
dampers for the boiler which includes the super
heater are normally moved to their closed posid
tion in starting up to avoid overheating of the
superheater tubes. With the present construc
tion however, there is little danger of overheating
of the superheater tubes, as the connection of
60 most of the furnace wall heating surface into the
superheater boiler circulation will accelerate the
circulation in that boiler and cause it to heat up
rapidly.
This application is a division of my prior appli
65 cation, Serial No. 121, ?led Jan.»2, 1935.
While in accordance with the provisions of the
statutes I have illustrated and described herein
the best form of my invention now known to me,
those skilled in the art will understand that
70 changes may be made in the form of the appa
ratus disclosed without departing from the spirit
of the invention covered by my claims, and that
certain features of my invention may sometimes
be used to advantage without a corresponding use
of other features.
'
ing the walls of said furnace, and conduits ar
10
ranged to connect a major portion of said fur- '
tion system of said generating unit including
steam heating surface.
2. A steam generator comprising a furnace, a 15
pair of steam generating units having separate
water circulation systems and arranged at op
posite sides of and receiving" heating gases from
said furnace, one of said generating units includ
ing only water heating surface and the other gen 20
erating unit including both water heating and
steam heating surfaces, plurality of water wall
sections lining the walls of said furnace, and con
duits arranged to connect the majority of said
water wall sections into the circulation system of 25
said generating unit including steam heating sur
face.
-
3. A steam generator including a steam super
heater comprising a series of vertically extend~
ing return bend tubes divided into front and rear
sections with respect to the heating gas ?ow path,
the return bend tubes in said rear section being
arranged in parallel nested rows and the return
bend tubes in said front section being of the same
flow area as the tubes in said rear section and $5
arranged in a single row and each directly con
nected to a plurality of tubes in said rear section
by a Y-?ttlng, and means for passing steam to
be superheated ?rst through said rear section.
4. A steam generator including a steam super 4.0
heater comprising a series of vertically extending
return bend tubes divided into front and rear sec
tions, the return bend tubes in said rear section
being arranged in parallel nested rows and the
return bend tubes in said front section being ar 45
ranged in a single row and each connected to a
plurality of tubes'in said rear section, and a ba?le
extending substantially between said front and
rear superheater sections and locating said front
section in a downflow gas pass and said rear sec
50
tion in an up?ow gas pass serially connected to
said down?ow gas pass.
5. A steam generator including a pair of ver
tically spaced drums, a bank of steam generat
ing tubes connecting said drums and bent to 55
provide a substantial space between adjacent
rows thereof, and a steam superheater compris
ing a series of return bend tubes positioned in
said space and divided into'front and rear sec
tions,‘ the return bend tubes in said rear section
being arranged in parallel nested rows and the
return bend tubes in said front section being
arranged in a single row and each connected to a
plurality of tubes in said rear section.
6. A steam generator including a pair of verti 65
cally spaced drums, a bank of steam generating
tubes connecting said drums and bent to provide
a
substantial
space between
adjacent
rows
thereof, a ba?le dividing said space into front and 70
rear vertical gas passes, and a steam superheater
comprising a series of return bend tubes posi
tioned in said front and rear gas passes, the re
turn bend tubes in said rear gas pass being ar-_
ranged in parallel nested rows and the return 75
3
2,114,224 . a
bend tubes in said front gas pass being arranged
front and rear coils into a self-supporting unitary
structure, and means for supporting each unitary
structure
comprising a pivotal supporting connec
of tubes in said rear gas pass.
7. A steam generator including a pair of verti- . tion between said structure and the upper drum
cally spaced drums, a bank of steam generating and a supporting connection between said struc
tubes connecting said drums and bent to provide ture and the lower drum constructed to permit
a substantial space between’ adjacent rows there-_ downward expansion of said structure relative‘ to‘
’
of, a steam superheater comprising a series of said lower drum.
12. In a steam boiler receiving heating gases
Y in a single row and each connected to a plurality =
return bend tubes positioned in said space, means
10 connecting said return bend tubes into a self-sup
from a furnace, a steam superheater comprising. 10
a plurality of return bend ‘coils in the flow path
of said heating gases, each of said coils having a
porting unitary structure, and means for pend
entlysupporting said unitary structure from the plurality of tube'portions, the portion nearest
under side‘ of the upper ‘drum.
the furnace being formed of a single tube having
8. A ‘steam generator including upper andv a bifurcation at one end and a portion farther
15 lower drums, a bank of steam generating tubes from said furnace being serially connected to said
connecting said drums and bent to provide asub
?rst portion and formed of a pair of tubes joined
stantial space between adjacent rows thereof, to the bifurcated end of the first mentioned tube,
a steam superheater comprising a series of return and means for passing steam to be superheated
bend tubes positioned in said space and arranged first through the tube portion farther from said 20
20 in parallel ?at coils, means connecting the tube
legs in each coil into a self-supporting unitary
13. In a steam boiler receiving heating gases
structure, and means for supporting the unitary ‘ from a furnace, a steam superheater comprising
structures so formed from said upper and lower a plurality of ?at return bend coils in the ?ow
path of said heating gases, each of said coils hav 25
9. A steam generator including upper and lower ing a plurality of tube portions, the portion near
25
drums, a bank of steam generating tubes con
est the furnace being formed of a single tubev
necting said drums and bent to provide a sub
having a bifurcation at one end and a portion
stantial space between adjacent rows thereof, a farther from said furnace being serially con
steam superheater comprising a series of return nected to said first portion and formed of a pair 30
30 bend tubes positioned in said space and arranged ofnested tubes, each of the same flow area as
in parallel ?at coils, means connecting the tube said single tube, joined to the bifurcated end of
legs ineach coil into a self-supporting unitary and in the same plane as the ?rst mentioned
structure, and means for supporting each unitary tube, and means for passing steam to be super
structure comprising a pivotal supporting con
heated ?rst through the tube portion farther 35
35 nection between said structure and the upper from said furnace.
'
drum and a supporting connection between said
14. In a steam boilerv receiving heating gases
structure and the lower drum constructed to per ' from a furnace, a steam superheater comprising
mit downward expansion of said structure rela
a plurality of return bend coils in the ?ow path
tive to said lower drum;
>
of said heating gases, each of said coils having, 40
10. A steam generator including upper and a plurality of tube portions, the portion nearest
40
lower drums, a bank of steam?generating tubes the furnace being formed of a single tube having
connecting said drums and bent to provide a a bifurcation at one end and a portion farther
substantial space between adjacent rows thereof, from said furnace being serially connected to said
a steam superheater comprising a series of return ?rst portion and formed of a pair of tubes joined 45
45 bend tubes positioned in said space and divided to the bifurcated end of the ?rst mentioned tube,
into front and rear sections, the return bend and a baiiie extending between said tube portions
'tubes in said rear section being arranged in par
and locating said portions in different passes of
allel ?at coils with nested tubes in each coil and the heating gas ?ow path.
' ,
the return bend tubes in said front section being
.15.'A steam generator including a pair 'of ver 50
50 arranged in parallel ?at coils with a single tube tically spaced drums, a bank of generating tubes‘
in each coil and each connected to a plurality of connecting said drums, a steam superheater in
tubes in a corresponding coil in said rear section, cluding a group of return bend superheating
means connecting corresponding front and rear tubes extending adjacent said tubef-bank and Y
coils into a self-supporting unitary structure, and having portions adjacent said ‘upper and lower 55
furnace,
drums.
‘
.
_
‘
55 means for supporting the unitary structures so
formed from said upper and lower drums.
11. A steam generator including upper and
lower drums, a bank of steam generating tubes,
connecting said drums and bent to provide a
60 substantial space between adjacent rows thereof,
a steam superheater comprising a series of re
turn bend tubes positioned in said space and
divided into front and rear sections, the return
bend tubes in said rear section being arranged‘
65
,
in parallel ?at coils with nested tubes in each
coil and the return bend tubes in said front sec
drums, and means for supporting said steam su
perheating tubes from said upper and lower
drums.
,
'
;
16. A steam generator including a-pair of ver
tically spaced drums, a bank of generating tubes 60
connecting said drums, a steam superheater in
cluding a group of vertically disposed return bend
superheating tubes extending adjacent said tube
bank, means for supporting said superheater
tubes at their upper ends, and means for sup
65
porting the lower ends of said superheater tubes
from said lower drum, said last‘ named means
tion being arranged in parallel ?at coils with a being constructed to permit thermal expansion
single tube in each coil and each connected to and contraction of said superheater tubes rela
a plurality of tubes in a corresponding coilin tive to said lower drum.
70
70 said rear section, a header positioned above and
connected to said coil sections, a tension support
DAvm' s. JACOBUS.- '
for said header, means connecting corresponding
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