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Патент USA US2105821

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Jan. 18, 1938.
2,105,821l
R. M. PARSONS
FURNAC E
lF‘ilecì Aug. 20, 1936
5 Sheets-Sheet 1
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INVENTOR .
. `/ïa//f/nï faisons
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BY .
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RNEY
Jan. 18, 1938.
R. M. PARSONS
2,105,821
FURNACE
Filed Aug. 42O, V1936
3 Sheets-Sheet 2
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BY
Jan. 1s, 193s. ^
R. M. PARSONS
2,105,821 ' _
FÚRNACE
Filed Aug». 20, 1936
3 Sheets-Sheet 3
INVENTOR
Fal/4h
/ï fàravm
BY
ORNEY
Patented Jan. 18, i938
2,105,821
unirse srArE-s
.
PATENT OFFICE
2,105,821
FUBNAUE'
Ralph M. rai-sons, chicago, nl., assignor fo The
Ralph M. Parsons Company, Chicago, Ill., a
corporation of Delaware
Application August 20, 1936, Serial No. 96,939
10 Claims.
(Cl. 122-356)
This invention relates to furnaces and more
particularly `to tube stills for use in oil cracking
and reñning plants.
In one embodiment, the invention is applied
5 to a furnace having a vertically elongated corn
bustion chamber'containing a bank of radiant
heat-tubes and a convection chamber disposed
above the combustion vchamber in alignment
therewith. The burners are located at the bottom
10 of the combustion chamber so that the combus
tion gases are caused to pass upwardly over the
various tubes in the combustion and convection
chambers and are withdrawn from the top of
_ the convection chamber.
10
An object of the present invention is to pro
vide an improved means for mounting and sup
porting the tubes in the combustion and convec
tion chambersof a furnace of the above type.
Another object is to improve the details of con
20 struction and method of operation of such a
furnace.
`
I
Various other objects and advantages will be
apparent as the nature of the invention is more
fully disclosed.
.
Y
`
A feature of the invention consists in the pro
vision of a supporting frame located outside of
i
invention a's shown is applied to a furnace hav
ing a combustion chamber I0 provided with side '
walls I I and end walls I2, and a convection cham
ber I3 of smaller cross section than the combus
tion chamber Il) located directly thereover. The
convection chamber I3 is provided with side walls
Id which may be joined to the side walls II 'by
sloping sections I6. A hood I'I is mounted above
the convection chamber I3 and is adapted to con
duct the exhaust gases to a stack I8. The walls
II and I2 may be supported upon side and end
foundations 2l and ‘22, respectively. A ñoor 23
may be supported by a plurality of transverse
beams 2d resting upon the side foundations 2|
and central piers 25. Between the side founda 15
tions 2! and the central piers 25, rows of burners
26 and 27 are provided, which are inclined to
ward the side walls so as to direct the ñame
against said walls for heating' the same to radi
ance. The burners 26 may be provided with a 20
ñared central passage 28 through which gaseous
fuel and air for combustion are passed. The
burners 2l may have a similar central passage 29
formed therein which communicates with a jet
30 supplied with liquid fuel and air or steam for 25
atomizing from pipes 3l. Air for combustion is
the furnace walls and carrying trusses which supplied to the passages 29 from ducts 32, which
support the various tubes. Both the convection receive the air from ducts (not shown) extending
tubes and the radiant heat tubes are carried in ‘ upwardly along the side walls of the furnace. and
terminating at the top of the side walls. It is 30
tube sheets which are hung from the above men
to be understood that the burners 2S and 2l
tioned trusses. The radiant tube sheets are sus
may be used alternately depending upon whether
pended below the convection tube sheets and ex
tend vertically down the center of the combustion liquid or gaseous fuel is to be employed.
The lower part`~ of the side walls II, against
chamber to support the radiant heat tubes in a
position to receive radiant heat from both of the which the ñame from the burners is directed, muy 35
be thicker than the upper part of said walls which
furnace walls.
`
y
Various other features consist in the details are not required to withstand the same intensity
of heat and are not relied upon to absorb the radi
of construction and combination of parts, here
inafter more fully set forth.
40
’ ant heat and to re-radiate the same to the radiant
`
Although the invention is capable of various
uses, it will be understood from the following de
scription and the accompanying> drawings, in
which one embodiment thereof is set forth for
purposes of illustration.
us Ll
In the drawings:
_
Fig. 1 is a vertical, longitudinal section through
a furnace embodying the present invention;
Fig. 2 is a transverse section taken along the
line 2-2 of Fig. 1;
50
‘
Fig. 3 is 'a transverse section of the furnace
taken along the line 3-3 of Fig. l;
y
v
Fig. 4 is a partial section taken along line
d-¿I of Fig. l showing details of the anchor for
the end tube sheets;
Fig. 5 is a section taken along the line 5-.-5
of Fig. 4; and
Fig. 6 is a perspective showing the arrangement
of the supporting truss and the means for sus
pending the tube sheets therefrom.
Referring to the drawings more in detail, the
heat tubes, to be described. The side walls It 40
of the convection chamber I 3 may be of still
thinner construction as they are subjected only to
convection heat. The walls may have an outer
covering 35 of impervious material, such as sheet
rockor any material which will prevent escape of 45
air' or combustion gases. If desired, the walls
may be made of monolithic refractory cement in
which case they are substantially air and gas tight ~
and the outer lining may not be required.
For supporting the walls Ill and I 6, and the 50
various tube sheets to be described, there is pro->
vided a framework comprising side buck stays 36
and end buck stays 31 which may rest upon the
foundations 2l and 22, respectively. The side
walls II may be anchored to the side buck stays 55
36 at convenient points' by suitable means not
shown.
.
'
A set of vertical truss members 40' and inclined
truss 'members 4I are positioned adjacent the
side walls i4 and the sloping walls IG of the fur
60
2
2,105,821
nace. Suitable means, not shown, may be pro
vided to secure the walls to these truss members.
The vertical truss members 40 form a part of a
vertical truss comprising a top plate 42, bottom
plate 43 and bracing members 44. The tops of
. the buck stays 36 are joined by the cross members
45 to the top plate 42 to form an upper horizontal
truss. The upper ends of the inclined members
4| are joined to the side buck stays 36 by hori
10 zontal members 46. Longitudinal member 41
joining the side buck stays 36 at the point of at
tachment of the horizontal members 46 forms,
in conjunction therewith, a lower horizontal
truss. The various truss members are preferably
15 joined together by welding to form a rigid struc
ture.
End and intermediate convection tube sheets
50, and 50a, respectively, are provided carrying
convection tubes 5I and located in the convection
chamber I3. These convection tube sheets 50,
56a are provided with hangers 52, 52a, respec
tively, which extend over and seat in channels 53
carried by a longitudinal plate 54 secured to the
top plate 42.
-
25
The lower convection tubes 58 in the convection
chamber are carried by end and intermediate
lower tube sheets 59 and 59a, respectively, which
are provided with hangers 60 and 60a, respec
tively, extending through the walls I4 and rest
30 ing between gussets 6| on the ends of the hori
zontal members 46 and on the bottom plate 43.
Lugs 6 la are formed on the hangers 60 and 60a to
engage the ends of the horizontal members 4B for
positioning the hangers. The intermediate lower
35 tube sheets 59a carry suspended radiant tube
sheets 62 which are formed with brackets 63
projecting alternately on opposite sides of the
tube sheets 62 so as to support the two rows of
radiant heat tubes 64 in staggered relationship.
The end tube sheets 59 carry end radiant tube
sheets 65 which are provided with apertures 66
in which the radiant heat tubes 64 are mounted.
The end radiant .tube sheets A65 are formed in
a plurality of sections which are joined together
45 by links 61. Each section may be provided at
its lower end with a flange 68 which engages a
yoke 69 carried by an angle iron 10 which ex
tends through the end wall i2 and is supported by
the end buck stays 31. The lower ends of the
50 radiant tube sheets 62 and 65 are joined by longi
tudinal members 12 having forks 13 formed at
the ends thereof which are seated over lugs 14
formed on the various tube sheets 62 and 65.
The yokes 69 serve to anchor the end tube sheets
high temperature to which they are subjected,
are preferably made of alloy steel.
It is to be ,
understood that suitable heat insulation may be
used over the faces of the various tube sheets, if
desired.
'
-
It will be noted that by suspending the radiant
tube sheets from the lower tube sheets 59, all sup
ports at the bottom of the furnace are eliminated
and the supply of 'radiant heat from the walls of
the furnace to the tubes is unimpeded. In this
construction the maximum tube area is utilized
for heat transferred and a maximum quantity of
heat is thus transferred to the oil without caus
ing overheating or carbonization thereof. Fur
thermore, a substantial saving of weight is
effected since the suspended tube sheets can be
made lighter than tube sheets which are sup
ported only at the bottom. The radiant tube
sheets extend from a point near the bottom of the
combustion chamber to the convection tube 20
sheets, thereby dividing the combustion chamber
into two sections and causing the gases from the
two rows of burners to pass upwardly on opposite
sides of the radiant heat tubes before the gases
are allowed to converge into the convection chain
ber. The tubes 58 carried in the lower tube
sheets 59 receive both radiant heat and the heat
of convection, whereas the radiant heat tubes84
receive principally radiant heat and the convec
tion tubes 5l receive principally heat of con
vection.
30
This furnace is particularly adapted for oil
cracking, the arrangement of the tubes being such
that high temperatures can be employed and
maximum heating eiiiciency obtained. The sus
pended tube sheets arefree to expand as required,
the flanges B8 sliding in the yokes S9 for this
purpose. The anchors for the end tube sheets
and the members connecting the bottoms of the
various tube sheets form a rigid and strong sup 40
porting structure for the tubes which is cheap and
convenient to install and repair.
It- is to be noted that the tubes 58 are arranged
in a bank having inclined sides which are di»
rectly in the path of the combustion gases and
are also exposed to the radiant heat from the
furnace walls. These tubes protect the convection
tubes 5| from the intense radiant heat and, be
_cause of their independent support, can be re
placed without disturbing the convection tubes.
The suspended radiant heat tubes are located
at the center line of the combustion chamber
between the two rows of burners so as to receive
heat from both side walls. The burners are in
55 65 in position against the end Walls I2 of the - clined toward the side walls to prevent direct
furnace, whereas the longitudinal members 12 impingement of the flame on the above tubes.
serve to secure the lower ends of radiant tube The location of the burners and the direction of
sheets 62 and thereby form a comparatively rigid the flame can be varied according to the particu
supporting structure for the radiant heat tubes 64. lar furnace. In some instances, particularly in
It will be noted that the intermediate radiant large furnaces, the burners may direct the flame 60
tube sheets 62 are also formed in a plurality of vertically or somewhat toward the tubes provided
sections which are joined together by links 15.
the spacing is such as to prevent overheating
In the above construction, the radiant tube or burning out of the tubes.
sheets are suspended from the lower tube sheets
Although a specific embodiment of the inven
59, the latter being hung on the framework of tion has been shown for purposes of illustration,
the furnace independently of the upper tube it is to be understood that it is adapted to vari
sheets 50. The weight of all of the tubes is ac
ous 'uses and changes and modifications may be
cordingly carried by the furnace framework in
made therein without departing from the scope
dependently of the furnace walls. The inde
of the invention which is to be limited only in
pendent suspension of the upper and lower tube accordance with the following claims when in
sheets distributes the weight on the framework terpreted in view of the prior art.
and also permits independent removal of the tube
What I claim is:
sheets for purposes of inspection or repair. The
l. In a furnace of the class described, side
upper tube sheets 5D may be made of cast iron, Walls defining a combustion chamber, additional
whereas the lower tube sheets 59, because of the side walls defining a convection chamber located 75
2,105,821
directly above said combustion chamber, a frame
work located entirely outside of said walls, a
~ bank of convection tubes in said convection cham
3.
of said tube sheets being located adjacent said
end walls and means extending through said end
walls to anchor the lower ends of said last tube
ber, tube sheets suspended from said framework
sheets to said framework.
and carrying said tubes, a vertical bank of radi
ant heat tubes located at‘the center of said com
bustion chamber, tube sheets for said radiant
6. In a furnace ofthe class described, side and
end walls forming a vertically elongated combus
-tion chamber, a vertically extending bank of
horizontal radiant heat tubes located in the cen
ter thereof and dividing the combustion chamber
heat tubes suspended from said framework inde
pendently of said ñrst tube sheets, and rows of
10 burners on opposite sides of said bank of radiant
heat tubes to direct a flame upwardly between
said bank and said first side walls.
2. In a furnace of the class described, side
walls defining a combustion chamber, additional
15 side walls defining a convection chamber located
,
,
'
into two sections, burners located in both sec 10
tions for supplying heat to both sides of said bank
of radiant heat tubes, a framework located out
>side of the furnace walls, a row of tube sheets
carrying said radiant heat tubes, hangers secured
to said tube sheets, said hangers extending
through said side walls and being secured to
work located entirely outside of said walls, a bank ’ said framework to' suspend said bank of radiant
of convection tubes in said convection chamber, heat tubes within said combustion chamber, cer
directly above said combustion chamber, a frame
tube sheets suspended from said framework and
20 carrying said tubes, a vertical bankof radiant
heat tubes located at» the center of said combus
tion chamber, radiant tube sheets carrying said
radiant heat tubes, hangers associated with said
radiant tube sheets, said hangers extending
25 through the side walls and .being supported by
said framework independently of said` first tube
sheets, and rows of burners onv opposite sides of
said bank of radiant heat tubes to direct a ñame
upwardly between said bank and said iirst side
walls.
.
3.A In a furnace of theclass described, side and
end walls forming a vertically elongated combus
tion chamber, a vertically extending bank of
horizontal radiant heat tubes located in the cen
35 ter thereof and dividing the combustion cham
ber into two sections, burners located in both sec
tions for supplying heat to both sides of said
bank of radiant heat tubes, a framework located
outside of the furnace walls, hangers extending
40 through said side walls and secured to said frame
work and tube sheets carried by said hangers to
suspend said radiant heat tubes within said com
bustion chamber.
`
`
-
„
4. In a furnace of the class described, side and
15à
tain of said tube sheets being located adjacent
said end walls, flanges formed at the lower ends 20
. of said last mentioned tube sheets and anchor ' '
means secured to said framework to slidably en
gage said ñanges whereby expansion of said tube
sheets is permitted.
’7. In a furnace of the class described, side and 25
end walls forming a vertically elongated combus
tion chamber, a vertically extending bank of
horizontal radiant heat tubes located in the cen
ter thereof and dividing the combustion chamber
into two sections, burners located in both sec 30
tions for supplying heat to both sides of said
bank of radiant heat tubes, a framework located
outside of the furnace walls, a row of tube sheets
carrying said radiant heat tubes, hangers se
cured to said tube sheets, said hangers extend,~
ing through said side walls and'being secure'd
to said framework to suspend said bank of ra
diant heat tubes within said combustion cham.
ber, certain of said tube sheets being ~located
adjacent said end walls, said last mentioned tube
sheets `comprising a plurality of vertically dis
placed sections serially joined together and means
extending through said end walls to anchor each`
section of said framework.
,
8. A sectional suspended tube sheet comprising
45 end walls forming a vertically elongated combus
a plurality of vertically displaced plates serially
tion chamber, a vertically extending bank of hor
izontal radiant heat tubes located in the center . joined together, a supporting framework, a hang
thereof and dividing the combustion chamber er attached to the top section to suspend the same
into two sections, burners located in both sections
50 for supplying heat to both s_ides of said bank of
from said framework, yokes attached to said
framework and vertical ñanges carried by each 50
section engaging said yokes to anchor the sec
radiant heat tubes, a framework located outside
of the furnace walls, a row of tube sheets carry
4tions to said framework.
ing said radiant heat tubes, hangers secured to-said tube sheets, said hangers extending through
bustion chamber, a supporting truss on opposite
55 said side walls and being secured to said frame
work to suspend said bank of radiant heat tubes
within said combustion chamber, and means ex
tending through said end walls to anchor the
lower ends of said tube sheets to said framework.
60
5. In a furnace of the class described, side and
end walls forming a vertically elongated combus
tion chamber, a vertically extending bank' of hor
izontal radiant heat tubes located in the center
thereof and dividing the combustion chamber
65 into two sections, burners located in both sec
tions for supplying heat to both sides of said
bank of radiant heat tubes, a framework located
outside of the furnace walls, a row of tube sheets
carrying said radiant heat tubes, hangers se
70 cured to said tube sheets, said hangers extending
through‘said side walls and being secured to said
framework to suspend said bank of radiant heat
tubes within said combustion chamber, certain
9. In a furnace of the class described, a corn
sides thereof, a tube sheet carrying a bank of 55
tubes, hangers on opposite sides of said tube
sheetengaging said trusses to suspend the tube
sheet therefrom, and an additional tube sheet
hung from said first tube sheet and carrying a
bank of radiant heat tubes located at the center 60
of said combustion chamber to receive heat
equally from both side walls thereof.
10. A suspended tube sheet comprising an
elongated plate having tube-carrying means, a
supporting framework, a hanger attached at the
top of `the tube sheet to suspend the same from
said supporting framework, a vertical flange at
the lower end of said plate'and a yoke perma
nently secured to said framework and having a
flange engaging behind said first flange to slid 70.
ably anchor the lower part of said tube sheet to
the framework.
'
.
RALPH M. PARSONS.
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