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Feb. 28, 1950
GAS BURNER OF
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Patented Feb. 28, 1950
2,499,218
UNITED STATES PATENT OFFICE
2,490,218
ons mmm or' mTYPEINWRICH
LDIIBUSTION IS ACCOMPLISHED IN
A BEFBACTCBY LINE!) CGMBUSTION
CHAMBEB
Frederic 0. Beal. Philadelphia, Pa., asllgnor to
Sein (iorporation oi' America, Philadelphia, Pa.,
a corporation o! Pennsylvania
Application September 26, 1946, Serial No. 699,415
l
2 Claims. (CL 158-105)
This invention relates to burners of the type
having a refractory lined combustion chamber in
which practically complete combustion of a combustible gaseous mixture is accomplished and
irom which heated products of combustion are
discharged at a. relatively high velocity through
a restricted outlet in the form of a high temperature gas stream.
It ls an object of the invention to provide an
improvement in burners of this type. particularly to obtain better distribution of the high temperature heating gases produced by the burner.
I accomplish this by providing a hollow partitioned body to form two combustion chambers
whose restricted outlets are closely adjacent to
one another so that work during its movement
past the outlets at close range thereto is iirst
heated by one high temperature gas stream and
immediately thereafter is heated by the other
high temperature gas stream.
Further. the combustible gaseous mixture is
supplied to the inlets of the combustion chambers
from separate hollow manifolds to each oi' which
2
combustible gas mixture is supplied to the cham
bers l2 and I4.
dependently controlling the supply of combustible
gaseous mixture toeach combustion chamber, the
One end oi’ a hollow open-ended metallic shell
i! is removably secured at 26 to the base mem
5 ber Il. The shell I6 envelops and snugly holds
in position a hollow refractory body 2l having
a partition 22 which divides the interior thereof
into two combustion chambers 22 and 26 extend
ing alongside each other. As shown, the hollow
l0 refractory body 2| comprises a number of refrac
tory parts formed of any suitable material. such
as silicon carbide or beryllium oxide, which are
united together in any suitable manner, as by
a high temperature air-hardenable cement, for
i5 example. In order that the refractory body 2l
will be rigidly held within the shell I9. a layer
26 of air-hardenable cement may be applied to
the'exterior surface of the refractory body bei'ore
the latter is positionedinthe shell.
20 The combustible gas mixture delivered to the
inlet chambers or manifolds I2 and Il liows
therefrom through apertured screen members 26
and 2l which may be formed of beryllium oxide,
i'or example, and positioned at the inlet ends of
25 the combustion chambers 23 and 24. In this way
the combustible gaseous mixture is subdivided
into a multiplicity of small jets. In burners of
character and physical properties of the high tern-
the general type being described, practically
the gaseous mixture may be independently supplied at a controlled rate and pressure. By in-
perature gas streams may be individually regucomplete combustion of the gas jets may be ac
lated whereby each gas stream will precisely ef- 30 complished in the combustion chambers 23 and
feet the desired heating of the work during its
24, as will be described presently, and the high
. movement past the outlets.
temperature gases produced therein and consist
The above and other objects and advantages
ing substantially entirely of heated products of
of the invention will be more fully understood
combustion, are discharged through restricted
upon reference to the following description and 35 outlets 28 and 29 as high temperature gas streams.
accompanying drawing forming a part oi’ this
When the burner I0 is relatively cool and at a
specification, and of which:
low temperature, it is placed in operation by ini
Fig. 1 is a vertical sectional view, taken at line
tially supplying combustible gaseous mixture
I-l of Fig. 2, of a burner embodying the inven- - through the conduits I5 and I6 at a relatively low
tion;
40 pressure which may be equivalent to a, pressure
Fig. 2 is a sectional viewl taken at line 2_2 of
corresponding to about 5 or 6 inches of water
Fig. l, to illustrate the burner more clearly; and »
column. for example, so that the gaseous mix
Fig. 3 is an end view looking toward the re-
ture discharged from the combustion chambers
23 and 2l can be ignited to Produce and main
Refel‘l'ing t0 the drawing. the gas burner I6 45 tainilames at the outlets 28 and 29.
embodying the invention includes a. hollow metalWhen he llames are being maintained at the
lic base member l I formed to provide two chamoutlets 26 and 26, the pressure of the gaseous mix
bers l2 and I4. The chambers I2 and I4 serve
ture supplied through the conduits IB and i6
as inlet manifolds for a combustible gaseous mlxmay be momentarily reduced suiilciently to cause
ture which is delivered thereto from a suitable 50 the flames to backiire through the outlets 28 and
source of supply through conduits i6 and I6 oon
26 onto the apertured screen members 2B and 21
nected to the inlets oi' the chambers. In the con
in the combustion chambers 23 and 2l. When
duits I6 and I6 are connected manually operable
this occurs a plurality of llames are produced and
valves l1 and I8, respectively, for individually
maintained at the upper ends of the small aper
controlling the pressure and rate at which the 66 ture formed in the screen members 26 and 21.
Y stricted outlets of the burner illustrated in Fig. l.
9,409,810
When the names are being maintained within
the combustion chambers I8 and 14 at the top sur
iaces- oi' the apertured-screen members 2l and
I1. the pressure oi the
us mixture supplied
through the conduits Il and-‘ii maythen be in
creased. Aiter a short interval of time the names
portions o! the rods or illaments are heated to a
temperature just short of the fusing temperature
without any danger of distorting or otherwise
adversely aii'ecting the rod or filament by the
lvelocity at which the gas stream impinges the
work. After such preheating of the glass ilia
ment or rod, it is then made ready to be heated
to its fusing temperature by the portion of the
gas stream at the maximum velocity and maxi
inner refractory linings that these surfaces are
temperature tor the most emcient produc
heated to high incandescent temperatures. The 10 mum
tion oi glass übers.
heating of the inner refractory linings to a highly
The burner Il of the invention is especially
incandescent condition and radiant heat there
suitable
for the production o! glass ilbers from
from promotes substantially complete combustion
rods or tllaxnents as well as other heating appli
oi the gaseous mixture in the combustion spaces ' cations
where precise control o! the heating of
23 and Il before the mixture reaches the outlets 15 work is necessary
and desirable in the initial and
2l and 2|. From the outlets 28 and Il are dis
maintained at the top surfaces ot the screen
members It and 21 edect such heating of lthe
charged gas streams at temperatures nearly equal
to the temperatures in the combustion spaces 23
.
final heating stages. By providing the burner
it having two combustion chambers I8 and Il
alongside oi each other. and independently con
and 2l.
By way of example and without limitation, the 20 trolling the supply oi' combustible gaseous mix
ture to each chamber. the temperature and veloc
heated products of combustion may be discharged
ity at which the gas streams are discharged from
from the combustion spaces 23 andV 2l through the
the outlets 28 and 2l can be accurately con
restricted outlets 2l and 29 at elevated tempera
trolled. In this way, when work or elongated ex
tures over a wide temperature range up to 2900°
is fed at close range to the outlets 28 and Il,
F. and higher, when a combustible gaseous mix 25 tent
as indicated in dotted lines at Il in Fig. 2. the
ture of air and ordinary gas, such as city gas
temperature and physical properties oi’ each gas
havinga B. t. u. rating of about 550 B. t. u. per
stream can be independently regulated to eßect
cubic foot. for example, is supplied at a delivery
the desired initial heating by the gas stream dis-l
pressure in the neighborhood oi.' three pounds per
irom the outlet I! into which the work
square inch. Under such operating conditions 30 charged
initially passes; and the ñnal heating by the gal
the pressure in the combustion chambers 2t and
stream discharged from the outlet It into which
24 may vary over a wide range up to a pressure
the work immediately passes from the iirst gas
corresponding to 'I0 inches oi water column and
stream.
a'ppreclably above that of atmospheric pressure.
In the embodiment of the invention illustrated.
The heated gases may be discharged from the 35
burner It through the outlets 2B and I9 over a
wide velocity range up to a maximum velocity
of 1000 feet or more per second.
the outlet 2B is more restricted than the outlet Il.
Hence, by supplying the combustible gas mixture
to the chamber 2l at a pressure less than that at
which the gas mixture is supplied to the combus
In certain heating applications heating of work
entirely by a single gas stream does not utilize the 40 tion chamber 2l, the heating gases will be dis
charged irom the combustion chamber 24 at a
high temperature gases emciently. This is par
lower temperature and at a lower velocity than
ticularly true when work oi elongated extent is
the heating gases discharged from the combus
moved continuously into the gas stream at close
tion chamber 23. This regulation of the temper
range to the restricted outlet to be heated from
ature and velocity at which the heating gases are
the ambient temperature to a desired elevated
discharged from the outlets 2l and Il can be
temperature. In such cases the portion oi the
positively controlled by independent adjustment
gas stream into which the work initially passes
of the valves I1 and il.
is in a sense acting to preheat the work. When
heating of the work is accomplished by a single
It will now be understood that an improve
ment has been provided ‘in which etllcient dis
gas stream, all of the high temperature gases 50 tribution of the high temperature heating gases
forming the gas stream are at the same high tem
produced and developed in a single burner is ob
perature and high velocity and at optimum values
tained. In the illustrated embodiment ot the
determined by the maximum temperature to
invention, the outlets 28 and 29 are relatively
which the work must be heated. While a portion
close together whereby the gas streams dis
of such gas stream can be employed to effect pre 65 charged therefrom brush against each other and
heating of the work, experience has shown that
in effect form a single large gas stream. In
such high temperature gases into which the work
this way, the work, after it once passes into the
initially passes are not eillciently utilized.
gas stream, will always be enveloped in an at
Thus, in certain heating applications it is not
mosphere of the heating gases during its move
necessary for the high temperature gases, in the 60 ment past both of the outlets 2l and I8.
portion of the gas stream into which the work
While a particular embodiment of the im- y
initially passes, to be discharged from the burner
proved burner of the invention has been shown
outlet at the same high velocity as the gases in
and described, it will be obvious to those skilled
the portion of the gas stream into which the work
in the art that modifications and changes may
ilnally passes to be heated to the desired elevated 65 be made without departing from the spirit and
temperature. In many instances the work is
scope of the invention as pointed out in the fol
heated more eillciently in its initial stage by dis
lowing claims.
charging the heated gases against the work at a
What is claimed is:
reduced velocity and at a reduced temperature.
l. A burner comprising structure including a
One example o! such heating is that of heating 70
partitioned hollow body which provides two com
glass filaments or rods which are continuously
bustion chambers having inlets at one end and
i'ed into the high temperature gas streams for
restricted
outlets at the opposite ends, means
producing glass ilbers. The portion o! the gas
providing two hollow manifolds each of which is
stream into which the glass illaments are initially
in communication with a different one of the
ted is desirably such that successive longitudinal
8,499,313
chambers at the inlet ends thereof, means to
control individually the supply o! a combustible
mixture to each manifold whereby a combustible
gaseous mixture maybe independently supplied
thereto at a controlled rate and pressure. means
forming the inlets of the chambers providing a
number of small passages for subdividing into
a plurality of iets the gaseous mixture entering
the chambers from the manifolds, the outlets
and inner wall surfaces of the chambers being
formed entirely of high temperature refractory
material whereby substantially complete com
a controlled rate and pressure. means at the
inlets of thc chambers providing a number o!
small passages for subdividlng into a plurality
Vof ,iets the gaseous mixture entering the cham
bers from the manifolds. the outlets and inner
wall surfaces of the chambers being formed en~
4tirely of high temperature refractory material
whereby substantially complete combustion of
the iets may be eil'ected in the chambers, and
the outlets being disposed closely adjacent to one
bustion of the ,iets may be effected in the cham
another so that the heated gases discharged
from the chambers in the form of high tem
peraturc gas streams may be applied to work
bers, and the outlets being disposed closely ad
at close range to the outlets in such a manner
,iacent to one another so that the heated gases
that work during its movement past the outlets
will be impinged by the gas streams in succes
discharged from the chambers in the form of
high temperature gas streams may be applied
to work at close range to the outlets in such
a manner that the work during its movement
past the outlets will be lmpinged by the gas
streams in succession.
1A burner comprising structure providing
two hollow bodies disposed alongside one an
other whlch form two combustion chambers hav
ing inlets at one end and restricted outlets at
the opposite end, means providing two hollow
manifolds each of which is in communication
with a different one of the chambers at the inlet
sion.
REFERENCES CITED
The following references are of record in the
i‘lle of this patent:
UNITED STATES PATENTS
Number
Name
Date
1,782,683
Giacomino ______ __ Nov. 25, 1930
2,367,119
Hess ______________ -_ Jan. 9, 1945
end thereof, means to control individually the
supply of a combustible mixture to each mani- 3o Number
fold whereby a combustible gaseous mixture
498,295
may be independently supplied thereto forming
,
FREDERIC O. HESS.
FOREIGN PATENTS
Country
Date
Germany ________ __ May 21, 1930
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