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March 22, 1938.
2,112,202
C. E. LUCKE
STEAM BOILER
Filed Oc‘t. 5, 1935
4 Sheets-Sheet l
,
A
`
INVENTOR.
Char/e5 E. VLuc/fe
>
March 22, 1938.
C. E. LUCKE
. 2,112,202
STEAM BOILER
Filed oct. 3. 19:55
i
0O/amo,J0
4 sheets-sheet 3
_4
60
33
/56
/6
Z
23
13?'
5
J7
45
l
6.5
INVENTOR.
Char/es E. Lacke
R
ATTORNEY.
March 22, 1938. '
C, E, LUCKE
STEAM BOILER
` Filed Oct. 3,
2,112,202
r
1935
'
l 4 Sheets-Sheet 4
55
INVENTOR.
Char/g5 E, [uc/(è
lä
ATTORNEY.
I. Patented Mar. 22, 1,938u
UNITE-o STATES PA'rENTtoFFIcE
STEAM BOILER
Charles E. Lucke, New York, N. Y., Aassigner to
The Babcock & Wilcox Company, Newark,
N. J.. _a corporationof New Jersey
` Application October 3, 1935, serial No. 43,321
_7.1'1 Y Claims.
(ci. 122-336)
Fig. 4 is a view similar to Fig. -1 of a modi;
This invention..relates in general to the con
struction of steam generating umts, and more
particularly tosteam generating units in which
flcation;
a water cooled furnace is located wholly at one
5-5 of'Fig. 4; and
_ 5 side of the main tube bank of a two-drum steam
boiler. _Steam generating units of this type are
i mainly characterized by their relatively low
Fig. 5 is a horizontal section taken on the line
‘
.
‘
’
'
Figs. 6 and '7 are views similar to Fig. k1 of two
other modifications.
`
`
In the embodiments of my invention illustrated
cost of manufacture and maintenance, small in the drawings, the boiler settings are sub
lfloor space and headroom requirements, and rel- ï stantially rectangular in horizontal and vertical
10 atively wide >range of capacity operation at high' cross-section, being formed by vertical side walls
emciencies.
‘
.
-
.
.
A main object ofmy invention is the provision
of a steam `generating unit of the character de
scribed with an improved location of the fuel
>burning means in one of the furnace walls -ex
_tending longitudinally of the main tube bank
with the fueli discharged having a length oi'
travel in the furnace through a path directed so
as to cause .substantially the entire furnace vol
20 ume to be filled with fuel burning in suspension
at various stages of combustion` and the initial
10
Ill and I2, end walls II and I3, a top wall or roof
I4, and a bottom wall or floor I5, hereinafter,
specincally described.- In the unit shown in Fig'.
2, the horizontal distance between the side Walls
Ill-and I2l is substantially greater, than between 15
the end walls. II and I3, but this ratio will vary
with thefsize of the unit'.
"
‘I'he pressure parts of .the steam boilers shown .
in Figs. 1-5 and 7 include a horizontally elongated `
upper steam and water dru'm I6 `and a lower wa
ter` drum I1 in axial alignment therewith, both
of which extend the full distance .between the side
_of heat radiation from the, higher temperature. wallsII and I3 and adjacent to but spaced from `
the side wall I2. The drums I6 and I1 are con
section of 4the path, thus insuring complete com
bustion of the fuel in suspension in the furnacel nected> by a vertically disposed bank of substan
. portionv of the path to receive asubstantial amount
at a high rateof heatfrelease. Anotherl mai'n
object of my invention is the provision in a steam
generating unit of the character described of ~a
baille systemA for ‘the tube bank which will cause
a heating gas ñow relative to the tubes of the
tube bank isuch as to effect a high rate of heat
tially straight water tubes I8 extending between
and `having their ends radially connected to the Y
-drum walls at both sides of the vertical plane in
cluding the longitudinal axes of the drums. As
shown in Figs. 1 and 2, the innermost longitu
dinal tube‘rowv Iii'l is spaced from the adjacent
`wanner throughout the tube bank, a 10W draft, tube row a substantially greater distance than
loss inthe unit, and a rapid rate of fluid circula-4
tion through the tubes, whereby a relatively high
steaming capacity and generating efñciency can
¿be easily maintained in operation.
that between the remaining longitudinal rows of
the tube bank.
4
I
c
'
A row of water tubes I9 extends laterally from
fthe lower drum Il to a longitudinal header 20 ‘
f '
at the bottom of the side wallv Il), the spaces be-‘
tween the tubes being closed by refractory ma
y ticularity in4 the claims annexed to and forming a. v terial 2l constructed to form a floor I5. JA row ol’v
tubes 22 extends upwardly from the‘header 2li to
40 part of this speciiication. For- a better under
a similarly arranged top header 23. The spaces
standing oflv the invention, its operating advan
_ tages and specific objects attained by its use, between the tubes 22 are filled with refractory
reference should be had tothe accompanying' material to form the inner portion of the sidel
drawings and descriptive matter in which I have wall I0. A corresponding row of roof tubes 24
illustrated and described preferred embodiments ' vconnects the header 23 to the upper drum I6, with
The various features of novelty which charac
terize my invention are pointed out with par
>of my invention.
>Of the drawings:
c
_
vthe spaces between the tubes closed by refrac
'
'
_
_
- tory material to form the underside of the top
.
Fig. 1 is a somewhat diagrammaticisectional
elevation of one form of my invention taken on
the line I-I of Fig. '2;
l»
"
Fig.Y 2 is a horizontal section taken on the line
2--2 of -Fig. l.;v
`
’
`
Fig. 3 is a horizontal section taken on the line
5."
2-3 oi' Fig. l;
wall I4. 'I'he end walls II and I3 are each pro'
vided at their inner- sides with a row of cooling
tubes 25 extending between upper and lower
transverse headers 26 and 21 respectively,.havirig
their inner ends connected to the drums I6 and
Il respectively by nipples-28. The walls I0, II,
I3, I4, and> I5 and tube bank collectively deñne
the limits of the boiler furnace 32, wholly lo
55
2
aliases
cated at one side of the tube bank I 8 and be
tween the vertical limits of the drums I3 and I1.
'I‘he construction of the walls I t, II, I3 and I4
with a substantial amount of exposed tube sur
face permits the ratio of cold surface to total
wall surface and to furnace volume to be varied
from the high temperature gases. At the oppo
site side of the drum I 'I is a dust hopper 45, which
receives dust swept oil' the drum by the gases
or separated out of the heating gases above the
over a relativelydwide range to secure the most
hopper.
effective mean furnace temperature for different
operating conditions and for different sizes of
The side wall I2 is as shown, spaced throughout
its'extent from the outer side of the tube- bank
furnaces.
4
.
'I'he boiler furnace shown in Figs. 1-3 is adapted
for the burningof various fluid fuels, such as
pulverized fuel, oil, or gas, in suspension, and is
particularly suitable for the burning of pulverized
15 coal. The provisions for this purpose preferably
consist of one or more ñat ñame burners 3 I, such
as the multiple outlet pulverized fuel burner
shown in a pending application of Ervin G.
Bailey, Serial No. 484,739, ñled Sept. 27, 1930,
mounted in corresponding burner ports 32 formed
in the roof I4 intermediate the ends of the fur
nace and adjacent the drum I6. The nozzle out
lets of each fuel burner are positioned within an
air box 33 opening to the corresponding burner
25 port and the fuel streams pass between corre
sponding roof tubes 24, to produce a longitudi
nally elongated stream of mixed pulverized coal
and air. Each fuel burner is downwardly directed
With its axes of discharge intersecting the side
30 Wall IIl adjacent its lower end, whereby the fuel
stream tends to follow a flame path initially di
rected toward the side wall Ill, but curving down
wardly above the iioor I5 towards the tube bank
I8, whereby substantially all of the furnace
35 volume will be effectively utilized by the elongated
flame path so provided to permit substantially
'complete combustiondof the fuel stream before
reaching the tube bank. The fuel stream thus
passes through the furnace in a direction trans
versely of the tubebank, i. e., the fuel burner is
located in a furnace wall extending longitudinally
of the tube bank with its axis of discharge in a
vertical plane transverse to that wall.
f
The specific construction of the furnace bottom
I 5 will mainly depend upon the mean furnace
temperature desired to be maintained and the
ash fusion temperature of the pulverized fuel to
be used. The furnace shown in Figs. 1 and 2 is
designed for dry ash removal. For this reason
50 the furnace bottom is constructed to provide a
40
relatively fiat horizontal floor for receiving the
ash separating from the burning fuel. The de
posited ash may be periodically removed from the
floor by pushing or blowing the same into an
en Cn ash pit 35, constructed in the iìoor adjacent the
end wall I I, .as shown in Fig. 2. Clean-out open
ings 36 are provided in the walls II and I3 at the
ñoor level andin the ash pit to facilitate removal
ofthe deposited ash.
(30
for holdingmaterial, such as deposited furnace
dust, to protect the upper surface of the drum
'
The fuel burner arrangement described is es
pecially adapted for an advantageous heating gas
flow relative to the tube bank I8. As shown in
y Fig. 1, the tube bank I3 is provided with a baille
system consisting of a tube baille 40 extending
downwardly from the upper drum I6 and formed
by providing the upper half of the tubes I8'
with studs 4 I, and filling the corresponding inter
tube spaces with refractory material 42, as shown
in Fig. 3. The lower end of the baiiie 40 has a
downwardly inclined lateral extension 43 ter
minating adjacent the outer side of the tube bank.
lThe lower ends of the tubes I8' are also provided
with refractory embedded studs to form a short
tube baille 44 which protects that side of the lower
drum from furnace radiation and forms a pocket
~ I8. A baille d6 extends horizontally from the
wall I2 across most of the tube bank I8 at a level
intermediate the bafi‘ie extension 43 and the upper
drum I6, whereby the bailles 4I), 43, and 46 in
conjunction with the side walls II, I2, and I3 de
fine three serially connected superposed gas
passes 50, 5I, and 52 extending transversely of
the tube bank I8, with the passes 50 and 5I pro
gressively tapering and connected by a gas turn
ing and equalizing space 53 between the tube bank
I8 and wall I2, and the passes 5I and 52 con 20
nected by a gas turning and equalizing space 54
between the tube baille 40 and the main portion of
the tube bank. 'At the side of the upper drum I6
opposite the furnace and in communication with
the outer end of the gas pass 52 is arranged a 25
heating gas outlet 55 controlled by one or more
dampers 56. The heating gases from the fur
nace will thus flow transversely of the tubes I8
throughout their height through gas passes hav
ing flow areas proportioned for a low draft loss. 30
and highly effective heat transfer by reason of
the mass ñow conditions.A The passage of the
hottest gases ñrst across the lower portions of the
tubes effects a rapid iìuid circulation in the tubes
I8, because the average fluid density in the tubes 35
due to the presence of steam in the water will be
reduced over a greater vertical height of tube
compared with the water in downcomer tubes.
The steam generated in the boiler passes out of
the upper drum I6 through outlet connections 63 40
leading to a looped tube self-draining superheater
formed by a pair of longitudinally extending hori
zontal headers di and 62 located adjacent the
drum I1 and connected by nested rows of looped
tubes 63 positioned in the gas pass 50 in the space
between the tubes I8' and the adjacent row of
tubes I3. The superheater tubes are arranged in
position to receive a portion of their heat by radi
ation from the furnace chamber through the
spaces between the tubes I8’. The nested super 50
heater tube rows are preferably spaced to provide
a uniform transverse spacing of the tube legs
and the tubes are bent at their- lower ends to
pass between the tubes I8'.
In operation, the streams of pulverized fuel and
air are discharged downwardly over a substantial
portion of the furnace length in a path initially
directed towards the side wall I0 and then curv
ing towards the'lower portion of the tube bank.
Combustion of the fuel is substantially completed 60
before the stream reaches the tube bank, andthe ash separated in suspension drops to the fur
nace floor normally in a dry condition, The por
tions of the tubes I8’ in front oi.' the superheater
further cool any ash particles in suspension and
also protect the superheater tubes from an ex
cessive amount of radiant heat. The gases then
pass over the superheater tubes and the remain
ing portion of the tube bank and turn upwardly
through the space 53 into the gas pass 5I. The 70
space 53 effectively maintains a uniform distribu
tion òf the heating gases and permits ash par
ticles separating from the heating gases to drop
directly into the ash hopper 45. The gases then
pass inwardly through the second pass SI to the
3
2,1 12,202
zontal extension 46h between the _tube bank and
Any ash deposited> on the baille l side wall I2,-the baille system thus defining three
space 5t which functions in the same manner as
the .space 53.
superposed serially connected gas passes 50', 5I',
extension 43 can be blown into the ash hopper.
The ~gases thenl pass outwardly vthrough the top
is primarily distinguished from the form shown'.-
and 52'. `'I'he >setting space made available
above the baille extension 46h and'below the top
wall iii at the outer side of the gas pass 52 .is
advantageouslyv utilized for an auxiliary ñuid
in Figs. 1 to 3 by the different provisions for
heater 10, such as an economizer or lair heater.
. gas pass 53 to the' heating gas outlet 55.
„ The modification illustrated in Figs. 4 and 5
treating the Iincombustible ash residue of the The steam boiler construction illustrated in Fig.
In Fig. 4 the furnace bottom is shown as _,7, like those shown in Figs. 1-6, provides a rela 10
designed for thecollection of the ash in a molten 'tively long flame path in the fluid _cooled fur
condition, the tubes i9 being covered by a layer nace in _a direction transversely of the tube bank
of slag resistant material B5 shaped to support and effects a .passage of the heating gases trans
a pool of molten slag which can be continuously versely of the tubes in the tube bank for sub
stantially their entire length. Alb of the de 15
or intermittently ‘ tapped through a slag tap
opening 66 located> in the side wall ii. In view scribed forms of my-invention are adapted for
oi’ the molten condition of the ash particles in manufacturing in a- range of sizes having sub
10 fuel.
suspension the tubes it’ and the _nextadjacent
stantially the same overall eiiiciency.
row of tubes i8 of the tube bank have their
While in accordance with the provisions of the
statutes I have illustrated and described herein 20
,20 lower portions bent to form a slag screen at the
_
As shown
_ _ in _ the best forms of my invention now known to
Figs. 4 and 5, the portions of the tubes it’ be- - me, those skilled in the art'will understand that
changes may be made in the form of the appa
_low the vertical portion of the baille 40 are alter
-furnace side of the superheater.
ratus disclosed without departing from the spirit
of the invention covered byvmy claims, and’ that 25
nately bent inwardly to varying extents to form
spaced rows of tubes ita and ith.
Alternate
certain features of my invention may sometimes _
- tubes in the laterally adjacent row of tubes i8,
be used to advantage without a corresponding use
which is alsospaced from the remaining rows,
have their `lower portions bent inwardly in front
»of other features.
of the superheater to form a third row .of screen
tubes isc.
I
claim:
'
'
,
-
i
1. A two-drum steam boiler comprising sub 30
stantially parallel upper and lower horizontal
drums, a bank of' vertically disposed water tubes
The bent portions of this row 'of
`tubes aid in supporting and cooling angularly
arranged tile pieces 43’ forming the inner por
tion'oi the baille extension 43.
In Fig. 6 I have illustrated another >modifica
connecting _said drums, side, top >and bottom
walls defining a furnace Wholly at one side 01‘
and open along its length to said tube bank and
tionl in which the tube bank it is constructed
and arranged similarly to that of Fig.` 4, but in closed at its lower end, a heating gas outlet at
Fig. 6 the Awalls ii, i3, It, and i5 are extended the opposite side of, said tube bank, cooling tubes
' toincrease the width of the furnace. Theiloor extending from said lower drum to the outer
tubes `i9 are also bent at their outer ends to side wall of said furnace and along said outer
.40 provide an elevated portioniof the furnace floor ’ side wall and top wall to said upper drum, fuel 40
burner means mounted in one of said furnace
in which is formed a burner port 32’ for a sub
stantially upwardly directed fuel burner'ßi'. As
diagrammatically indicated in Fig. 6, the fuel
.
stream initially passes through a vertical flame
path along the outer side of the furnace and
then downwardly toward the lower portion oi.’
the tube bank. The lower lportion .of the _fur
nace door receives substantially all of the ash
separating in the furnace'and the furnace and
50 door may be designed for the reception and re-l
moval of the'ash therefrom in“ dry form as
walls in position to discharge a stream of fuel ‘
in a direction transversely of said tube bank and
to cause the gases of combustion to approach
said tube bank substantially throughout the
length thereof,»a baille system for said tube bank
45
arranged to form a plurality _of serially con
nected superposed gas passes providing a gener
ally vertical flow of gases relative to said tube
bank and a substantially transverse ilow oi'gases 50
over the tubes of said tube bank throughout
shown in Figs. 1 ¿and 2 or in a molten condition their lengths, and a group of looped superheater
tubes arranged within and substantially parallel as shown in Fig. 4.
’
_
„ -In Fig. 'I I have illustrated another form of to the tubes >of said tube bank across the first
my invention in which the drums it and i'i are _ gas pass traversed by the combustion gases.
laterally oii’set and the tube bank it correspond
2. A two-drum steam boiler comprising sub
ingly inclined, leaving the furnace 3b’ _substan-l stantially parallel upper and lower horizontal
tially trapezoidal in vertical cross-section as dis
tinguished from the rectangular formation in
im Figs. 1, 4, >and 6. In this form, the upper header
`28 is eliminated and the portion ofthe top wall
it above the furnace is relatively short. The
fuel burner Sie. is rarranged to discharge verti
cally downward through a burner port`32El in
ct the top wall. 'I'his furnace construction is espe
.
' cially suitable for the collection'of slag deposits
drums, a bank of vertically disposed water tubes
connecting said drums and arranged at both sides of the plane including the longitudinal axes of 60
said drums, side, top and bottom walls definingv
a .furnace wholly> at one side of and open alo-ng
its length to said tube bank and closed at its
lower end, a heating -gas outlet along the opposite
side of said tube bank, cooling tubes extending
from said lower drum to the outer side wall of
in a molten condition on the bottom and their 'said furnace and`> along` said outer side wall and
removal 'through a slag tap opening 66a. The ' top wall to said _upper drum, fuel burner means
mounted >in one of said furnace walls at a point
baille system for the tube bank is arranged sub
stlntially as shown in Figs. 1, 4, and 6 to pro- f intermediate the length of vsaid drums and ar 70
Avide a similar fiow of heating- gases relative to> ranged to discharge a stream of fuel in a direc
tion transversely 'of said tube bank' and to cause
the tube bank. 'I'he baiiie extension 43a is ar
ranged horizontally instead of inclined, . while the gases ofA combustion to approach said tube
‘the superposed baille 46° is downwardly inclined
across the tube bank and _providedswith a hori
bank substantially throughout the length thereof
and adjacent one of said drums, Maille system.
4
10
2,112,202
for said tube bank arranged to form a plurality
tubes of said tube .bank throughout their lengths
of serially connected superposed gas passes pro
viding a generally verticalJ flow of gases relative
to said tube bank and a substantially transverse
flow of gases overfthe tubes of said tube bank
.throughout their lengths, and a group of looped
superheater tubes arranged within and substan
tially parallel Ato the tubes of said. tube bank
across the first gas pass traversed by the com
will be effected.
bustion gases.
,
.
3. A two-drum steam boiler comprising‘sub
stantially parallel upper and lower horizontal
drums with their axes in vertical alignment, a
bank of vertically disposed water tubes connect
15 ing said drums and arranged at both sides of the
plane including the longitudinal axes of said
drums, side, top and bottom walls defining a fur
f nace wholly at one side of and open along its
length to said tube bank and closedl at its lower
end, a heating gas outlet along the opposite side
of said tube bank adjacent said upper drum,
cooling tubes extending from said lower drum
to the outer side wall of said furnace and along
said outer side wall and top wally to said upper
25 drum, fuel burner means mounted in one of said
furnace walls at a point intermediate the length
of said drums and arranged to discharge a stream
of fuel in a direction transversely of said tube
bank and to cause the gases of combustion to ap
30 proach said tube bank substantially throughout
the length thereof and adjacent one of said
drums, a baille system lfor said tube bank ar
ranged to form three serially connected super
posed gas passes providing a generally vertical
35 flow of gases relative to said tube bank and a
substantially transverse flow of gases over the
tubes of said tube bank throughout their lengths,
said baille system including means forming a
vertical baille extending from one of said drums
to a level intermediate the height 0f said tube
bank, a rearward extension on said baille separat
ing the first and second gas passes; and a hor
izontally arranged baille extending inwardly from
the outer side of said tube bank intermediate the
height of said vertical baffle and separating the
second and third gas passes, and a group of
looped superheater tubes arranged substantially
parallel to the tubes of said tube bank across the
first gas pass.
50
`
4. A two-drum steam boiler comprising sub
stantially parallel upper and lower horizontal
drums, a bank of vertically disposed Water tubes
connecting said drums, side, top and bottom walls
defining a furnace wholly at one side of said
tube bank and closed at its lower end ad
joining said lower drum by a fluid cooled floor, a
top wall and arranged to downwardly discharge
astream of fuel in a direction transversely of
said tube bank and causing the gases of combus
tion to approach the lower portion of said tube
bank substantially throughout the length there
of and adjacent said lower drum, and a baille
system for saidl tube bank arranged to form a plu
rality of superposed serially connected gas passes,
the lowermost of which opens directly to said
furnace throughout the length thereof above
said lower drum, whereby a generally upward
flow of gases relative to said tube bank and a
substantially transverse flow of gases over the
tubes of said tube bank throughout their lengths
will be effected.
'
6. A two-drum steam boiler comprising sub 30
stantially parallel upper and lower horizontal
drums, a bank of water tubes connecting said
drums, side, top and bottom walls defining a. fur
nace wholly at one side of said tube bank and
closed at its lower end, a heating gas outlet along '
the opposite side of said tube bank, cooling tubes
extending from said lower drum to the outer side
wall of said furnace and along said outer` side
wall and top wall to said upper drum, fuel burner
means mounted in said bottom wall and arranged 40
to upwardly discharge a stream of fuel between
said cooling tubes in a direction transversely of
said tube bank and causing the gases of combus
tion to approach said tube bank throughout the '
length thereof, and a baiiie system for said tube 45
bank arranged to form a plurality of superposed
serially connected gas passes, the lowermost of
which opens to said furnace throughout the
length thereof, whereby a generally upwardilow
of gases relative to said tube bank and a- sub 50
stantially transverse flow of gases „over the tubes
of said tube bank throughout their lengths willv
be effected.
'7. A two-drum steam boiler comprising sub
lower drum to the outer side wall of said furnace
and along said outer sideïwall and top wall to
said upper drum, fuel burner means mounted in
a furnace wholly-at one side of said tube bank
and closed at its lower end, a heating gas outlet
tube bank, cooling tubes extending from said
65
drum to the outer side wall of said furnace and
along said outer side wall and top wall to said
upper drum, fuel burner means mounted in said
stantially -»parallel upper and lower horizontal
drums, a bank of vertically disposed water tubes
connecting said drums and arranged at both sides
of_ the plane including the longitudinal axes of
said drums, side, top and bottom walls defining
heating gas outlet at the opposite side of said
Ían
'
5. A two-drum steam -boiler comprising sub
stantially parallel upper and lower horizontal
drums, a bank of vertically disposed water tubes
connecting said drums, side, top and bottom walls
defining a furnace wholly at one side of said
tube bank and closed at its lowerend adjoining
said lower drum by a fluid cooled floor, a heating
gas outlet along the opposite side of said tube 10
bank, cooling tubes extending from said lower
no
one of said furnace walls and` arranged to dis- ' along the opposite side of said tube bank and
adjacent said upper drum,icooling tubes extend
charge a stream of fuel in a direction transversely
ing from said lower drum l)to the outer side wall
of said tube bank causing the gases of combus
tion to approach therlower portion of said tube
bank substantially throughout the length there
of and adjacent said lower drum, and a baiile
system for said tube bank arranged to -form a
of said furnace and along said outer side wall and 65
top wall to said upper drum, fuel burner means
mounted in one of said furnace walls and ar
ranged to discharge a. stream of fuel in a direc
tion transversely of said tube bank and to cause
plurality of superposed serially connected gas the gases of combustion to approach said tube
passes, the lowermost of which opens directly A bank substantially throughout the length there 70
to said furnace throughout the length thereof of and adjacent one of said drums, a baille sys
above said lower drum, whereby a generally up
tem for said tube bank arranged to form a plu@
ward iiow of gases relative to said tubebank and rality of superposed gas passes, providing agen-jv ` Y
75 a substantially transverse ñow of gases over `the erally vertical flow ot gases relative to said tubéfif
3,112,202
bank and a substantially transverse i‘low of gases
over the tubes of said tube bank throughout their
lengths, and the innermost tubes in said bank
having portions bent and spaced to form a slag
screen for the tubes in the first pass.
8. A two-drum steam boiler comprising sub
stantially parallel upper and lower horizontal
drums, a bank of vertically disposed water tubes
connecting said drums and arranged at both sides
lo of the plane including the longitudinal axes of
said drums, side, top and bottom walls defining a
furnace wholly at one side of said tube bank and
closed at its lower end, a heating gas outlet along
the opposite sideof said tube bank, cooling tubes
15 extending from said lower drum to the outer
side wall of said furnace and along said outer
side wall and top wall to said upper drum, fuel
burner means mounted in said top wall adjacent
said upper drum and arranged to discharge a
stream of fuel in a direction transversely of said
tube bank and to cause the gases of combustion
to approach the lower portion of said tube bank
substantially throughout the length thereof and
adjacent said lower drum, a baiiie system for
25 said tube bank arranged to form a plurality of
superposed gas passes providing a generally up
ward flow of gases through said tube bank and a
substantially transverse flow of gases over the
tubes of said tube bank throughout their lengths,
30 and the innermost tubes in said bank having
their lower ends spaced to form a slag screen for
tically disposed water tubes connecting said
drums and having transversely spaced inner__and
outer sections, a group of looped superheater
tubes extending vertically within the space be
tween said inner and outer tube bank sections,
water tubes extending laterally from said lower
drum to the opposite side Wall of said rsetting and
upwardly along said side wall and across to said
upper drum and defining a ñuid cooled furnace
chamber at one side of and open along its lengthV 10
to said tube bank inner section, a. heating gas
outlet at the opposite side of said tube bank, fuel
burner meansmounted in one of said setting
walls at a point intermediate the ,length of said
drums and arranged to discharge a stream of fuel 15
into said furnace chamber in a direction trans
versely of said tube bank whereby the combus
tion gases approach said tube bank inner section
substantially throughout-the length thereof, the
tubes in said tube bank inner section being ar 20
rangedto form a protecting screen between said
furnace chamber and said superheater tubes, and
a baille system for said tube bank arranged to
form a plurality of serially connected _superposed
gas passes across said tube bank outer section 25
providing a substantially transverse flow of gases
over the tubes of said outer section substantially
throughout their lengths.
»
11. A two-drum steam boiler comprising walls .
forming a setting of substantially rectangular 30
horizontal cross-section, upper and lower drums
4at one side of said setting having their longitudi
'i
9.A A two-drum steam> boiler comprising upper nal axes in vertical alignment, a bank of verti
and lower horizontal drums, a bank of vertically cally disposed water tubes connecting said drums
disposed water tubes connecting said drums and and divided into a pair of transversely spaced 35
arranged at both sides of the plane including inner and outer sections, a group of looped super
the tubes in the first pass.
f1.7
the longitudinal axes of said drums, side, top
and bottom walls defining a furnace wholly at
-one side of said tube bank and closed at its lower
end, a heating gas outlet along the opposite side
of said tube bank, fuel burner means .mounted
in one of said furnace walls and arranged to dis
charge a stream of fuel in a direction trans
versely of said tube bank and to cause the gases
of combustion to approach said tube bank> sub
stantially throughout the length thereof, a baf
fle system for said tube bank arranged to form
three superposed gas passes providing a generally
upward flow of gases relative to said tube bank
heater tubes extending vertically within the space
between said tube bank inner and outer sections,
water tubes extending laterally fromv said lower
drum to the opposite side wall of said setting and 40
along said side wall and across to said upper drum
and deñning a 'fluid cooled furnace chamber
wholly at one side of said tube bank- and open
along its length to said tube bank inner. section,
a heating gas outlet along the opposite side of 45
said tube bank outer section adjacent said upper
drum, fuel burner means arranged to discharge
a stream of fuel between said wall water tubes
into said furnace at a point intermediate the
length of said drums and in a direction trans 50
the tubes of said tube bank throughout their~ versely of said tube bank and whereby the com
lengths, said baiiie system including .a vertical bustion gases approach said tube bank substan
baiiie extending downwardly from said upper. tially throughout the length thereof, the tubes
drum along the inner side of said tube bank,` a in said tube bank inner section being arranged to
lateral extension of s‘aid baiile separating the first form a protecting screen between said furnace 55
and second passes, and a horizontally arranged chamber and said superheater tubes, and a baf->
baffle extending inwardly across said tube bank fle system for said tube bank including an L
and separating the second and third passes, said shaped baiiie extending downwardly from said
Vertical baille being widelyspaced from the main upper drum and transversely across said tube
bank outer section and a horizontally extending 60
co portion of said tube bank to provide a gas turn
and a substantially transverse ñow of gases over
ing and equalizing space connecting the second
bank being 'spaced from the adjacent wall to form
baffle extending inwardly partly across said tube
bank outer section' above the transverse section
of said L-shaped baille to form a plurality of se
a gas turning and equalizing space therebetween
connecting the ñrst and second gas passes, and
an ash hopper below said last mentioned space.
l0. A two-drum steam boiler comprising walls
tube bank outer section providing a generally 65
vertical ñow of gases relative to said outer sec
tion and a substantially transverse flow of gases
and third gas passes, the outer side of said tube
rially connected superposed gas passes across said -
forming a setting of substantially rectangular
over the tubes thereof substantially throughout
horizontal cross-section, upper and lower drums
adjacent one side of said setting, a bank of ver
their lengths.
'
`
‘
CHARLES E. LUCKE.
’
70
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