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Патент USA US2129900

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Sept. 13, 1938.
M. w. ‘BARNES
2,129,900
HEATING’ OF FLUIDS
Filed Jan, 20, 1934
0
0
0
INVENTOR
MAR N W; BARNES
g 5 TORNEY
Patented Sept. 13,1938
’
I
UNITED STATES PATENT OFFICE
‘2,129,900
_ HEATING or FLUIDS
Marion W. Barnes, Chicago, Ill., assignor to Uni
versal Oil Products Company, Chicago, 111., a
corporation of Delaware
Application January 20, 1934, Serial No. ‘707,535
3 Claims. (01:122-356)
This invention particularly refers to improvemerits in the heating of ?uids which is particularly well adapted to subjecting hydrocarbon oils
to the high temperatures required for their pyro- '
5 lytic conversion, although it is not limited to such
use and may be employed to advantage in the
heatingof liquid, vapors and gases generally as
well as mixtures of the same,
I have previously disclosed an improved type
l0 of furnace for the heating of ?uids having two
independently ?red combustion zones each con-
of the furnace is separated from combustion
zones 5 and 6 by relatively short suspended walls
1 and 1’ whereby the main furnace structure is
divided into three separate heating zones » 4, 5
and 6.
5
A plurality of suitable ?ring tunnels such as
indicated at 8 are provided at each end of the
furnace and a. combustible fuel-air-mixture of
any suitable form is supplied by means of burn
ers 9 through ?ring compartment ill of tunnels 10
8 to each of the combustion zones 5 and 6. Any
taining ?uid conduits supplied predominantly
desired portion of the air vrequired for combus
with radiant heat, the heating conditions in each 'tion as well as any desired quantity of excess air
being independently controlled, and having a, may be supplied to each of the combustion zones
15 centrally located ?uid heating zone separated through ducts II and II' of ?ring tunnels 8 15
from each combustion zone by a bridge wall and which, in the case illustrated, are located respec
containing a ?uid conduit around which the com- tively' above and beneath ?ring compartments l0. .
bustion gases from both combustion zones pass Excess air may also be admitted; when desired,
in a downward direction thereby supplying ?uid
through ?ring tunnels l0.
'
20 heat thereto.‘ The present invention embodies
improvements to this general type of furnace
structure, comprising locating the fluid heating
bank adjacent the roof of the furnace 'above
and at substantially right angles to the source of
25 heat. I have found that this arrangement augments the natural draft conditions in the furnace, since the movement of the gases through
It will be noted that in the furnace structure 20'
here illustrated there are no obstructions in the
direct path of ?ow of the combustion gases from
?ring tunnels 3 t0 the fluid heating Z0118 4; Walls
‘I and_'l' preferably extending, only a relatively
short distance below roof 2 su?lcient to‘provent 25
the sweep of hot combustion gases along the roof
of the furnace to ?uid heating zone 4 but not suf
the furnace due to the stack draft is in harmony
with the natural tendency of the heated gases to
30 rise. This largely eliminates eddy currents and
the back-wash of gases along the ?uid conduit
and results in a more de?nite separation of radiant and convection‘ heat than in any other fur-
?cient to obstruct or retard the free ?ow of gases
through the combustion zones into the ?uid heat
ing zone- It will also be noted that ?ring tlm- 30'
nels 8 are elevated, in the preferred embodiment \
here illustrated, sufficiently to prevent the sweep
of hot combustion ‘gases along the ?oor 0f the
nace of the so-called “open radiant” type. This
35 eliminates any dangerous and excessive superimposing of convection and radiant heat in the ?uid
vfurnace. In this manner predominantly'radiant
heat is imparted to the fluid Conduits along the 35
roof and ?oor of the combustion zones with a
conduits located within the combustion zones and
minimum of superimposed convection heat. The .
permits better control of the heating conditions
in each of the three heating zones. The improved
general direction of ?ow'of the hot combustion
gases from ?ring tunnels l0 through combustion
40 form of furnace of the present invention eliminates expensive bridge wall construction, underground ?ues and considerably decreases the
height of the main furnace structure.
The features of the present invention and their
zones 5 and 8 tofiuid heating zone 4 is indicated 40
by the arrows in the figure. The hot combus
tion gases from both Combustion Zones commih
gle within and beneath ?uid heating zone 4 and
pass upward therethrough to a suitable ?ue I2 45
45 advantages will be more apparent with reference
leading to a stack, not shown.
to the accompanying diagrammatic drawing and
the following description thereof, the single ?gure
of the drawing being a cross-sectional elevation
of one speci?c form of furnace embodied by the
50 present invention.
Referring to the drawing, the main furnace
structure comprises end walls I and l’, a roof 2,
a ?oor 3 and side walls which do not appear in
.
A ?uid conduit l3 comprising, in the case illus
trated, a single horizontal row of horizontally dis
posed tubes I4 is located adjacent the floor of
combustion zone 5 and a similar ?uid conduit 15,
also comprising, in the case illustrated, a single 50
horizontal row of horizontally disposed tubes l4,
is located adjacent the ?oor of combustion zone 6.
Another ?uid conduit l6 comprising, in the case
the particular view shown. A centrally located » illustrated, a single horizontal row of horizontally
55 ?uid heating zone E extending-through the roof
disposed tubes I4 is located adjacent the roof of 55
2
2,129,900
combustion zone 5 and a similar ?uid conduit I‘!
tion zone of the furnace will be found-particu
also comprising, in the case illustrated,‘ a single
horizontal row of horizontally disposed tubes I4
is located adjacent the rbof of combustion zone 6.
larly' advantageous whenever it is desirable to
maintain different heating conditions in the lat
ter. stages of heating as compared to those em
ployed in the previous heating stages. As an
example of its practical application this ?ow may
Another ?uid conduit l8 comprising a plurality
of horizontally parallel rows of horizontally dis
posed tubes “ is located within ?uid heating
be employed for the reforming of light distillates,
zone 4, Although not illustrated in the drawing, such
as those containing a substantial proportion
the tubes I4 of each of the banks l3, l5, l6, l1
of materials within the boiling range of motor
10 and I8 extend across the entire width of the vari
fuel, wherein it- is desirable to ?rst heat the distil
ous heating zones and terminate in suitable head
ers or return bends, ‘preferably located outside
the heated zone.
late to the desired?conversion temperature and
‘then to maintain the stream of heated distillate
It will be understood that two
at or near the maximum temperature previously
attained for a predetermined time.
or more rows of tubes may, when desired, be
15 employed in any or all of the ?uid conduits l3,
I claim as my invention:
I5,- I 6 and I1 although preferably when more
spaced that the projected surface of each is ex
posed to direct radiation from the ?ames and
20 hot combustion gases in combustion zones 5 and6.
It is also within the scope of the invention, when
desired, to eliminate the portions of ?uid conduits '
I3 and - l5 located beneath ?uid heating zone 4
_
1. In combination with a furnace having end
than a single row is utilized the tubes are so
walls, a roof and a ?oor, means forming a con
vection heating zone extending upwardly from a
the central portion oi’ the furnace roof, heating
tubes in said zone, .additional heating tubes in
the end portions of the furnace proper on the
opposite sides of said zone, means for ?ring the
furnace above the ?oor in opposite directions
and indicated in the drawing at I3’ and I5’, . through
the end walls substantially horizontally
Elimination of .these tubes will
toward
the
central portion of the furnace, means
serve. to substantially increase the heat imparted
to tube bank l8 and‘ particularly the lower 2 or 3 for removing combustion gases from the convec
tion heating zone, and means for passing ?uid
rows of this bank. _
As indicated by the arrows on the drawing, the serially through the tubes in said zone and in the
25 respectively.
furnace proper on the opposite sides of said zone.
2. In combination with a furnace having end 30
row of tubes in tube bank l8, ?owing in series
through. adjacent tubes in the same row and walls, a roof and a ?oor, means for ?ring the
through the adjacent rows of tubes in a general furnace through the end walls and above the
direction counter-current to the direction of ?ow ?oor in opposite, substantially horizontal direc
tions toward the central portion of the furnace,
35 of combustion gases through this zone of the
furnace, emerging from the lower row ‘of tubes means forming an outlet duct for combustion 35
in bank I 8 and entering the end tube of roof ‘gases through the central portion of the furnace
30 oil or other ?uid toibe heated enters the upper
bank l1 adjacent tube bank l8, ?owing in series
roof, heating tubes in said duct, additional heat
through adjacent tubes in bank IT in a general ing tubes in the furnace proper on both sides of
said duct, and disposed’ substantially at right
direction counter-current to the direction of ?r
ing, emerging from the end tube of bank I‘! angles to the direction of ?ring, and means for
adjacent the end wall of the furnace and enter a passing ?uid serially through the ?rst-mentioned
ing the last tube at the same end of ?oor bank tubes and said additional tubes.
3. In combination with a furnace having end
l5, ?owing in series through adjacent tubes in
45 this bank in a general direction concurrent to the‘ walls, a roof and a ?oor,,means for ?ring the
direction of ?ring, ?owing then in series through furnace through the end walls and above the
adjacent tubes in
?oor bank H in a general di- '
rection countercurrent to the direction of ?ring,
emerging from the end tube of bank l3 adjacent
50 the other end wall of the furnace and entering
the last tube at the same end of roof bank l6,
?owing in series through adjacent tubes in this
?oor in opposite, substantially horizontal direc 45
tions toward the central portion of the furnace,
means forming an outlet duct for combustion
gases through the central portion of the furnace
roof, heating tubes in said duct, roof tubes in
the upper portion of the furnace on the opposite 50
sides of said duct, additional heating tubes in
the end portions of the furnace adjacent the
bank in a general direction concurrent to the
_ direction of ?ring and being discharged from the
end tube of bank I 6 adjacent bank I8 and from . furnace ?oor, said roof tubes 'and additional tubes
the furnace.
This general type of ?ow wherein the same
stream of ?uid passes through the ?uid conduits .
~in one combustion zone of the furnace and then
60
through the ?uid conduits in the_otherrcombus
being disposed substantially at right angles to the
direction of firing, and means for passing ?uid
serially through the ?rst-mentioned tubes, the
roof tubes and said additional tubes.
MARION w. BAnNns.
60
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