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Патент USA US2403432

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„My 9, 1946.
JP. w. Pos1-ER. .JR
VAPOR GENERATING APPARATUS
`
Filed April 22, 19,42
2,403,432
4 sheets-sheet 1
.INVENTOR
July 9, 1946.
P. w. FOSTER, JR
2,403,432
VAPOR GENERATING APPARATUS
Filed April 22, 1942
4 Sheets-Sheet 2
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ATTORNEY
July 9, 1946.
P. W. FOSTER, JR
VAPOR GENERATING APPARATUS
, 1942
2,403,432
4 Sheets-Sheet 3
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INVENTOR
F0572?/al
ATTORNEYA .
ik.
Juäy 9, 1946.
P. w. FOSTER, JR
,403,432
VAPOR GENERA'I‘INGA APPARATUS
Filed April 22, 1942
4 sheets-sheet 4
24
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INVENTOR
PELL W’ 59572-7? fe.
ATTONEY .
"
Patented July 9, 1946
2,403,432
UNITED 'STATES PATIENT OFFICE
2,403,432
VAPOR GENERATIN G APPARATUS
Pell W. Foster, Jr., Englewood, N. J., assignor to
Foster Wheeler Corporation, New York, N. Y., a
corporation of New York
Application April Z2, 1942, Serial No. 440,052
7 Claims.
(Cl. 196-110)
This invention relates to heating, and more par
ticularly to apparatus for the generation of vapor
and heating of fluids.
In present methods of refining hydrocarbon
oils, the oils are charged through a still to impart
thereto the necessary heat to elTect their frac
tionation or‘conversion, which usually comprises
a plurality of tubular members through which
2
or less diagrammatically apparatus embodying
one form of the invention;
Fig. 2> is a transverse lvertical sectional view
taken on the line 2_2 of Fig. 1;
Fig. 3 is a transverse vertical sectional view of
a portion of apparatus embodying another form
of the invention;
Fig. 4 is a transverse vertical sectiona1 View of
the oil to be heated is passed, the members being>
disposed in a separately ñred furnace. In frac 10 a part of apparatus of a further form of the in
vention;
\
tionation, for example, oil heated in the still is
Fig. 5 is _a transverse vertical sectional view
passed through fractionating apparatus wherein
showing more or less diagrammatically appara
the hydrocarbon oil mixtures are separated into
tus embodying another form of the invention;
fractions of relatively narrow boiling point
Fig. 6 is a transverse vertical sectional view
ranges. It is necessary in present processes to
provide steam for various steps of fractionation,
for example to operate a distillation unit or to
revaporize some of the fractions before passing
` them through other
15 more orless diagrammatically showing appara
tus embodying a further form of the invention,
and
'
Fig. 7 is a sectional view taken on the line 'I-T
fractionating apparatus for
of Fig. 6.
separation into further fractions. The steam 20.r
Like characters of reference refer to like parts
generating apparatus and the still are generally
throughout the several views.
separate units and are separately .'ñred.
Referring to Fig. 1, the reference numeral I0
The present invention providesA apparatus in
designates a setting which includes vertical front
which the still and the steam generating appara
tus receive heat from gases of combustion `from 25 and rear walls I2 and II respectively, a side wall
I3, and a similar opposite side Wall 38. A roof
the same furnace. This construction results in
I4 extends across the top of the setting. A ver
a highly eflicient unit for heating oil and produc
tical partition I5 extends from the bottom ~of the
ing steam since the unit may be operated with
a minimum amount of air for combustion and a
setting to a point short of the roof thereof form
consequent breaking down of the oil which re
sults in the production of undesirable substances.
jacent the bottom of the furnace chamber I6, the
consequent high elliciency without the danger 302 ing _a furnace chamber I6 between the partition
I5 and the front wall I 2, and a gas passage I1
of overheating the oil processed in the still and
It is possible with ~the present invention to supply
heat to the still at a’ rate which is within a maxi
mum allowable limit without waste of heat since
between the partition and the rear Wall II.
Ad
passage I'I is divided into two separate passages
I9 and 20 as shown in Fig. 2. The furnace cham
ai ber I6 is fired by burners ZI positioned in the
side wall I3 adjacent the bottom of the furnace
chamber I6.
reducing the heat absorption in the still _tubes
A horizontal steam and Water drum 2.2 is posi
and thereby keeping the temperature of the oil
tioned
the roof I4 and over the furnace
in the still tubes within the maximum limit. Lo- 4i);r chamberabove
I6. A row of downcomer tubes 23 are
calized overheating in any still tube is prevented
disposed along the inner surface of wall I2.
by means of the present invention.
,
These tubes extend from the bottom portion of
The present invention provides apparatus inl
the drum 22 across a’portion of the chamber I6
which steam may be generated at a low or a high
adjacent the roof I4 and thence vertically down
pressure and in which suiîicient steam for the` 425i wardly along the wall I2 to the header 24 adja
operation of a distillation unit is produced by
cent the bottom of the chamber. A row of steam
means of heat produced in the still furnace which
generating tubes 25 similar to the row of tubes
obviates the expense in the construction and cp
23 also extends from the lower portion of the
eration of a separate steam unit.
The invention will be understood from the fol- 501; drum 22 horizontally across a portion of the roof
Hll in spaced relationship to the downcomers 23
lowing description when considered in connec
thence vertically downwardly in spaced relation
tion with the accompanying drawings formingV a
ship to the tubes 23 to the header 24. The tubes
part thereof and in which: ’
23 and 25 are separated by refractory material
Fig. 1 is a transverse vertical sectional view
26.`
The_surface of the partition I 5 toward the
taken on the line I-I of Fig. 2, showing more 66?
heat is absorbed by the steam generating tubes
furnace chamber I6 is lined with a row of steam
2,403,432
generating tubes 21 which extend from the lower
portion of the drum 22 at an inclined angle along
a portion of the roof I4 thence vertically down»
wardly along the partition I5 to the bottom of
the furnace chamber. The tubes are then bent
4
_header 44 is connected to the upper portion of
steam and water drum 22 through conduits 41.
The waste heat boiler tubes 43 are disposed in
the .passage 2l! in the same manner as tubes 42 are
positioned in the passage I9. The bottom of the
bank of tubes 43 is connected to an inlet header
48, which header is in communication with the
bottom portion of the drum 22 through conduits
49 while the top of the bank of tubes 43 is con
nected to an outlet header 5i) which is in turn
terial and are spaced from a bottom 29 of the 10 connected to the upper portion of the drum 22
chamber I6. Alternate tubes 21 are bent inward
by means of conduits 5I. Gases of combustion
ly toward the chamber I6 between the top of the
are withdrawn from the passage I1 and passages
partition I5 and roof I4 thereby forming a screen
I9 and 20 and discharged into a flue, not shown,
through which gases of combustion pass from the
by means of the fan 52.
chamber I6 into the passage I1. The side wall
In operation, water from the drum 22 flows
I3 is lined by a plurality of steam generating
downwardly through the downcomer tubes 23
tubes 30 which extend from the drum 22 vertically
Y along the wall I2 of the setting into the header
downwardly along said wall to a point short of
24. Upon firing the furnace chamber I5 by means
the burners 2l at which point the tubes are con
of the burners 2I, steam is generated in the tubes
nected to a header 3l. Tubes 30 form a row ex 20 25 adjacent the wall I2 and tubes 21 along the
tending between the wall I2 and partition I5, said
partition I5 and the bottom of the chamber I6,
tubes being horizontally spaced.
the steam rising through said tubes into the
A bank of superheater tubes 32 is positioned at
drum 22. Gases of combustion flowing upwardly
the top of the passage I1 adjacent the roof I4
through the chamber I6 generate steam in the
of the setting. The tubes extend transversely
tubes 3l), which steam passes upwardly into the
of said passage and as shown, the bank comprises
drum 22. The still tubes 35 adjacent the roof of
a plurality of horizontally spaced tubes each tube
the chamber I6 absorb heat from the gases of
being reversely bent to form a vertical row of
combustion in the chamber I6 and also from said
superimposed passes for vapor. Each tube ex
gases as they flow through the opening between
tends from an inlet header 33 downwardly to an 30 the top of the partition and the roof i4 into the
outlet header 34. The inlet header 33 is con
passage I1. Suñicient heat is absorbed from the
nected to the steam and water drum 22 by means
gases of combustion by the tubes 25, 21 and 3!) to
of a conduit 35.
reduce the temperature thereof so that there will
A row of still tubes 36 is disposed adjacent the
be no danger of overheating the oil flowing
roof I4 of the setting I0 substantially out of the 35 through the tubes 36. The gases of combustion
path of gases nowing from the chamber I6 into
from the chamber I6 pass downwardly in the
the passage I1. The tubes extend horizontally
passage I1, nrst passing over the superheater
between the walls II and I2 and are positioned
tubes 32 and thence over the bank of still tubes
side by side in spaced relationship to form a row
40. Since oil to be heated enters the tubes @i5 at
of tubes between the side walls I3 and 38. The 40 the bottom of the bank thereof, the now of gases
tubes 36 are serially connected and, as shown, oil
over the bank is countercurrent to the flow of oil
to be treated enters the row through a conduit
through the tubes. Heated oil from the tubes 46
31 connected to the tube 36 nearest the side wall
passes into the tubes 36 through the conduit 3l'.
I3 and passes serially through the tubes to an
Placing of the superheater ahead of the bank of
45
outlet 39 connected to the tube 36 nearest the
still tubes 4l) in respect to the now of gases obvi
wall 38.
ates the danger of overheating the oil flowing
A bank of still tubes 40 is arranged in the pas
through the tubes 4D. After passing over the
sage I‘I beneath the superheater tubes. The tubes
tubes 49, gases of combustion now from the pas
40 extend horizontally between the side wall I3
sage -I1 into the passages i9 and 23 and thence
50
and the opposite side wall 38 the tubes being sup
over the tubes 42 and 43 in said passages respecu
to extend horizontally across the bottom of the
chamber I6 to the header 24. The portion of the
tubes 21 extending across the bottom of the cham
ber are covered by a sheet 28 of refractory ma
ported at their opposite ends by said walls. The
tubes 40 are arranged in vertically and horizon
tally spaced rows, the tubes of each horizontal
row being serially connected.
Each horizontal
row of tubes is serially connected with the next
adjacent horizontal row. The bank of tubes 4I)
is connected to the still tubes 36 by means of the
conduit 31. Oil is fed to the bottom row of tubes
31 through a conduit 4I. The tubes 40 are sup«
ported intermediate their opposite ends by a tube
plate 40’. Banks of waste heat boiler tubes 42
and 43 are respectively positioned in passages I9
and 2U. The tubes 42 extend substantially hori
zontally acrossthe passage I9, between the wall
38 and the wall of the passage I9 opposite thereto
and comprise a plurality of horizontally spaced
tively thereby generating steam in said tubes.
Steam generated in the tubes 43 passes into the
header 50, thence through the conduits 5i into
the drum 22, while steam generated in the tubes
42 passes into the header 44 and ñows through
the conduits 41 into the drum 22. Steam in the
drum 22 passes through the conduit 35 and inlet
header 33 into superheater tubes 32 where it .is
superheated and passed to a point of use through
the outlet header 34.
In the form of the invention shown in Fig. 3,
a row of vertically extending still tubes 53 is dis- >
posed along the wall I2 of the chamber I5. The
ends of the tubes 36 adjacent the wall II are
serially connected while the opposite ends of the
tubes are connected to the upper ends of the
tubes each tube being reversely bent to form a
tubes 53. The lower ends of the tubes 53 are
Vertical row of spaced superimposed passes. The
serially connected. Oil to be heated will, there
opposite ends of the tubes 42 are respectively
fore, enter one of the tubes r36, ilow horizontally
supported by the side wall 38 and the wall of the 70 therethrough into one of the tubes 53 thence
passage I9 opposite thereto. Tubes 42 are con
downwardly in said tube to the bottom thereof
nected at one end to an outlet header 44 and at
whence it flows to the next tube 53. From the
the opposite end to an inlet header 45. The inlet
said next tube 53, the oil flows back to the tube
header 45 is connected to the steam and water
36 connected thereto whence it passes serially
drum 22 by means of conduits 46 while the outlet 75
2,403,432
through the other tubes 36 and 53. In this forml
of the invention, all steam generating tubes are
omitted from the walls of the furnace chamber
I6 with the exception of the tubes 30 adjacent the
wall I3 in which tubes steam is generated. In
other respects, the operation of this form of the
invention is similar to that of the form- shown in
the tubes 53 between said tubes and the burners
2I. The tubes 'II are positioned adjacent the
spaces between the tubes 53 so that eachtube
II shades the tubes 53 on opposite sides of said
tube from gases of combustion from the burners
2l, as shown in Fig. 7. The water wall tubes 'II
I Figs. 1 and 2.
In the form of the invention shown in Fig. 4, a
group of serially connected, horizontally extend
ing still tubes 54 are disposed on the Wall I3 of
the chamber I6, While a group of steam generat
ing tubes 55 extend along the wall I2 and roof I4
to the steam and water drum 22. A row of tubos
56 extends along the surface of the partition I5,
10
are connected into the circulation system of the
heater in the same‘manner as the tubes 25 in
the form of the invention shown in Fig. 1 of the
drawings.
At their upper ends, the tubes 1I
are connected to the steam and water drum 22
and at their lower ends are connected to a header
12. Downcomer tubes ‘I3 separated from the oil
tubes 53 by means of the refractory material '14,
are connected to the lower portion of the steam
and Water drum at theirupper ends and to the
header 12 at their lower ends. With the use of a
invention, oil to be heated enters the tubes 54
row of tubes ‘II to screen the still tubes 53 from
at 51 and flows serially through said tubes from
which the heated oil passes at 58. If desired, the 20 radiant heat of the gases of combustion from the
burners 2I, the heat kabsorption rate of the oil
oil may be preheated in a convection heated
heating tubes is decreased thereby obviating the
section of tubes such as the tubes‘llû shown in
Fig. 1.
.
possibility of overheating the oil therein.- An in
creased ñring rate to increase the rate of steam
As shown in Fig. 5, the waste heat boiler may
generation in the heater may be used in the
be heated by gases of combustion from an
chamber I6 without damage to the oil in the still
auxiliary furnace. In the form of the invention
tubes. It will be understood that the particular
shown in Fig. 5, the passage I'I is extended to a
location and arrangement of the row of screenv
point adjacent the bottom of the furnace cham
tubes 'II may be Varied in accordance with the
ber I6 and is in communication at the bottom
amount of heat to be absorbed thereby to main
thereof with the bottom of a furnace chamber 59 ’
tain the amount of heat absorption of the tubes
through a passage 60. The front of the chamber
53 within a maximum safe allowable limit so that
59 is formed by the wall II, while the rear is
the oil therein will not be overheated.
formed by a wall 6I. The chamber is fired by a
The use in a furnace of steam generating surburner 62 positioned in one side wall 63 of the
face together with Itubes through which oil to be
chamber. A bank 64 of horizontally extending
heated is passed provides apparatus in which high
steam generating tubes 65 is positioned in the
eiliciency is obtained without danger of overheat
chamber 59 above the burner 62. The bottom of
not shown in this View, on the side of the parti
tion toward the chamber I6. In this form of the
ing the oil since a minimum amount of air for
the bank of tubes is connected to an inlet header
combustion is required. The still tubes will not be
66 while the top of the bank is connected to an
outlet header G'I. The inletv header 66 is in comH 40 overheated due tothe absorption of heat by the
steam generating surface. Absorption of heat by
munication with the bottom of the drum 22
the steam generating surface controls the tem~
through conduits 68 while the outlet header $37 is
perature of the gases of combustion so that it is
connected with the upper portion of the drum by
not necessary to reduce the temperature thereofv
the conduits 69. The chamber 59 is in communi
before the gases pass over the convection heated
cation with the fan 52 through a passage 1U. In
other respects, the construction and arrangement
of the apparatus shown in Fig. 5 is similar to th
form of the invention shown in Fig. l.
4.”
'
In the operation of the form of the invention
shown in Fig. 5, gases of combustion passing from
the passage I'I flow into the chamber 59, through
the passage 59 where these gases mix with the
gases of combustion in the chamber 59, whence
still tubes by introduction of air or the recircula
tion of flue gases. With apparatus including oil
heating and also steam generating surface in one
furnace; suiiicient steam is produced in one unit
for the operation of a distillation unit without
the necessity of a separate steam generating unit
resulting in a ysaving of the cost of construction
and operation of a separate steam generating unit.
Positioning steam generating vtubes and still tubes
said mixture of gases are drawn over the group
64 of waste heat boiler tubes 65 and through the 55 in the same furnace and placing additional still
tubes and water heating tubes in a position to
passage 'In by the fan 52 which discharges the
recover waste heat from the gases of combustion
gases into a nue. With the apparatus of this
results in an overall fuel efficiency of the furnace.
form of the invention, steam may be generated
Although the invention has been disclosed as
in the apparatus independently of the furnace I 6
by ñring the burner 62,
60
In the form of the invention shown in Fig. 6, a
row of spaced vertically extending still tubes 53
is disposed along the wall I2 of the chamber Is
in the same manner as in the apparatus shown
Yin Fig. 3. Also, as in the form of the invention
shown in Fig. 3, the ends of the tubes 36 are 65
serially connected while the opposite ends of the
embodied in apparatus for heating petroleum and
generating steam, the invention is applicable to
the heating of various types of oil and the genera
tion of other forms of vapor. It is to be under*
stood that changes may be made in the form, lo
cation and relative arrangement of parts of the
apparatus shown and described herein, without
departing from the principles of the invention,
which is not to be limited excepting by the scope
of the appended claims.
’
tubes 53. The lower ends of the tubes 53 are
What is claimed is:
serially connected. The now of oil to be heated in 70
1. Vapor generating apparatus comprising a
the tubes 53 and 36 is the same in the form of
setting having enclosing Walls including substan
the invention shown in Fig. 3 hereinbefore de
tially vertically extending side walls, a substan
scribed. ’I‘he tubes 53, in the form of the inven
tially horizontally extending roof anda bottom,
tion shown in Fig. 6, are screened by a row of
a Vapor and liquid drum disposed above the roof,
spaced water wall tubes 'II spaced inwardly from
tubes are connected to the upper ends of the
75 a partition extending substantiallyvertically 'in
2,403,432
the setting between the side walls to a point short
of the roof dividing said setting into a heating
chamber and a heat absorbing chamber, means
in the lower portion of the heating chamber for
3. Vapor generating apparatus comprising a
setting having enclosing walls including substan
tially vertically extending side Walls, a substan
tially horizontally1 extending roof and a bottom,
a `vapor and liquid drum disposed above the roof,
producing a stream of products of combustion for
flow through the heating chamber and thence
through the heat absorbing chamber, a vapor
generating section in the heating chamber com
prising a row of spaced tubes extending substann
tially vertically along at least one side wall of the
chamber, another row of spaced tubes extending
a partition extending substantially vertically in
the setting between the side Walls to a point short
oi the rool dividing said setting into a heating
chamber and a heat absorbing chamber, means
substantially vertically adjacent the heating
chamber side of the first-mentioned row of tubes
and in spaced relationship to said side wall and
the ñrst-mentioned‘irow of tubes, the ñrst-men
tioned row of tubes and said other row of tubes
being connected in circulation with the drum, tu
bular members in the heat absorbing chamber,
said tubular members being in communication
with a source of oil supply, and other tubular
members extending substantially horizontally
across the top of the chambers closely adjacent
the roof and along said at least one side wall of
the heating chamber in the space between the
first-mentioned row and said other row of spaced [C Ci
tubes and in radiant heat absorbing relationship
to the products of combustion ñowing through
the chamber, said other tubular members being
connected with said first-mentioned tubular
in `the lower portion of the heating chamber for
producing a stream of products of combustion for
ilovv through the heating chamber and thence
through the heat absorbing chamber, a vapor
generating section in the heating chamber com->
prising a plurality of downcomer tubes extending
:substantially vertically along the chamber side of
least ene side wall of the chamber, spaced up'
comer tubes extending substantially vertically
adjacent said one side wall and in ispaced' re-lationship to the downcorner tubes, said upcomer
and downcomer tubes being connected to the
drum at the upper-portion thereof and connected
together at the lower portion thereof, tubular
members in the heat absorbing chamber, said
tubular members being in communication with a
source of oil supply, other tubular members ex
members, the other tubular members extending «
along said side wall being disposed opposite the
spaces between the tubes of said other row oi
tubes, the tubes of said other row of tubes being
so arrangedas to partially shade the other tubular members along said side wall from the stream
of products yof combustion and thereby reduce the
heat absorption rate of said members.
8
said side Wall from the stream of products of com
bustion and thereby reduce the heat absorption
rate `of said members.
'
2. Vapor generating apparatus comprising a
setting having enclosing Walls including substan~
tially vertically extending side walls, a substan
tially horizontally extending roof and a bottom, a
vapor and liquid drumfdisposed above the roof, a
partition extending substantially vertically in the
setting between the side Walls to a point short of
thefroof dividing said setting into a heating cham“
ber and a heat absorbing chamber, means in the
lower portion of the heating chamber -for pro»
ducing a stream of products of combustion for
flow through the heating chamber and thence
tending substantially horizontallyv across' the top
of the chambers closely adjacent the roof and
along said at least one side wall of the heating
chamber in the space between the upcomer and
downcomer tubes and in radiant heat absorbing
relationship to the products of combustion flow
ing through the chamber, said other tubular
members being connected with said first-men
tioned tubular members., the other tubular mem
bers extending along said side wall being disposed
opposite the spaces between the vupcomer tubes,
the upcomer tubes being so arranged as to par
tially shade the other tubular members' along
said side wall from the stream of products of
combustion and thereby reduce the heat absorp
tion rate of said members, and a baffle Wall posi
tioned between the other tubular members ex
tending along said one wall and the downcomer
tubes.
4. Vapor generating apparatus comprising a
setting having enclosing walls including side
through the heatV absorbing chamber, a . vapor 60 walls, a roof and a bottom, a vapor and liquid
generating section in the heating chamber com
drum disposed above the roof, a partition extend
prising a plurality of downcomer tubes extending
ing from the bottom of the furnace to a point
substantially vertically along at least one side wall
short of the roof dividing said setting into a heatu
of the chamber, spaced upcomer tubes extending
ing chamber and a heat absorbing chamber,
substantially vertically adjacent said one side wall
means in the lower portion- of the heating cham~
and in spaced relationship Vto the downcomer
ber for producing a stream of products of com
tubes, said upcomer and downcomer tubes being
bustion for flow through the heating chamber
connected to the drum at the upper portion
and thence through the heat absorbing chamber,
thereof and connected together at the lower por
a vapor generating section in the heating cham
tion thereof, tubular members in the heat absorb 60 ber comprising a plurality of downcomer tubes
ing chamber, said tubular members being in com
extending along at least one side Wall of the
munication with a source oi oil supply, and other
tubular members extending substantially horizon
chamber, spaced upcomer tubes extending adja
cent said one side wall and in spaced relationship
tally across the top of the chambers closely adja
to the dewncomer tubes, said upcomer and down
cent the roofvand along said atleast one side wall 65 comer tubes being connected to the drum at the
of the heating chamber in the space between the
upper portion thereof and in communication with
upcomer and downcomer tubes >and in radiant
each other at the lower portion thereof, tubular
heat absorbing relationship to the products of
members in the heat absorbing chamber, said
combustion iiowing through the chamber, said
tubular members being in communication with a
other tubular members being connected with said 70 source'of oil supply, and other tubular members
first-mentioned tubular members, the other tubu
extending across the top of the chambers closely
lar lmembers extending along said side wall being
adjacent the roof and along said at least one side
disposed opposite the spaces betweenthe upcomer
wall of the heating chamber in the space beta/veen>
tubes, the upcomer tubes being so arrangedv as to
the upcomer and downcomer tubes and »in radiant
partially shade the other tubular membersalong 75
2,403,432
heat absorbing relationship to the products of
10
other tubular members being connected with said
first-mentioned tubular members, the other tubu
lar members extending along said side wall being
ing section in the chamber comprising a row oi'
spaced tubes extending along at least one side
wall of the chamber, another row of spaced tubes
extending adjacent the chamber side of said
disposed opposite the spaces between the upcomer
first-mentioned row of tubes and in spaced rela- `
combustion flowing through the chamber, said
tionship to said side wall and the mst-mentioned
row of tubes, the first-mentioned row of Vtubes and
to partially shade the other tubular members
said other row of tubes being connected in circu
along said side wall from the stream of products
of combustion and thereby reduce the heat ab 10 lation with said drum, a row of tubular members
in communication with a source of oil supply and
sorption rate of said members.
disposed along said at least one side wall of the
5. Vapor generating apparatus comprising a
chamber in the space between the iirst-men
setting having enclosing walls including side
tubes, the upcomer tubes being so arranged as
walls, a roof and a bottom, a vapor and liquid
drum disposed above the roof, a partition ex
tending from the bottom of the furnace to a point
short of the roof dividing said setting into a heat---
ing chamber and a heat absorbing chamber,
tioned and said other row of spaced tubes and in
radiant heat absorbing relationship to .the prod
ucts of combustion from said ñring means, the
tubular members extending along saidnlside wall
being disposed opposite the spaces between the
tubes of said other row of tubes, the tubes of said
means in the lower portion of the heating cham
ber for producing a stream of products of com-_’ 20 other row of tubes being so arranged as‘to par..
tially shade the tubular members along said side
bustion for flow through the heating chamber
wall from the stream of products of combustion
and thence through the heat absorbing chamber,
and thereby reduce the heat absorption rate of
a vapor generating section in the heating cham
said members.
ber comprising a row of spaced tubes extending
7. Vapor generating apparatus comprising a
along at least one side wall of the chamber, an
'setting having enclosing walls including substan
other row of spaced tubes extending adjacent the
tially vertically extending side walls, alvapor and
heating chamber side of said first-mentioned row
liquid drum in the setting, means for firing the
of tubes and in spaced relationship to said side
chamber, a vapor generator in the heating cham
wall and the first-mentioned row of tubes, the
ber comprising a plurality of downcomer tubes
ñrst-mentioned row-of tubes and said other row-
of tubes being connected in circulation with said 30 extending substantially vertically along at least
one side wall oi’ the chamber, spaced upcomer
drum, tubular members in the heat absorbingtubes extending substantially vertically adjacent
chamber, said tubular members being in commu
said one side wall and in spaced relationship to
nieation with a source of oil supply, and other
the downcomer tubes, said upcomer and down
comer tubes being connected to the drum at the
tubular members extending across the top of the»
chambers closely adjacent the roof and along
said at least one side wall of the heating cham
ber in the space between the iirst-mentioned row
and said other row of spaced tubes and in radiant
upper portion thereof and connected together at
the lower portion thereof, a row of substantially
heat absorbing relationship to the products of
combustion ilowing through the chamber, said
other tubular members being connected with said
first-mentioned tubular members, the other tubu
lar members extending along said side wall being
nication with a source of oil supply and disposed
40 along said at least one side wall of the chamber
in the space between the downcomer and up
comer tubes and in radiant heat absorbing rela
vertically extending tubular members in commu
row of tubes being so arranged as to partially
tionship to the products of combustion flowing
through the chamber, the tubular members ex
tending along said side wall being disposed oppo
site the spaces between the upcomer tubes, the
shade the other tubular members along said side
upcomer tubes being so arranged as to partially
disposed opposite the spaces between the tubes of
said other row of tubes, the tubes of said other
shade the tubular members along said side wall
and thereby reduce the heat absorption rate of 50 from the stream of products of combustion and
thereby reduce the heat absorption rate of said
said members.
members, and a baille wall positioned between the
6. Vapor generating apparatus comprising a
tubular members extending along said one wall
setting having enclosing walls forming a furnace
and the downcomer tubes.
chamber, a vapor and liquid drum in the setting,
wall from the stream of products of combustion
means for firing said chamber, a vapor generat
55
PELL W, FOSTER, JR,
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