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Патент USA US2082696

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Patented June 1, 1937
UNITED STATES PATENT OFFM'ICI'ES'Y'S
2,082,696
COMBUSTION
AIDING MEANS ‘
William R.>Hulbert, Daniel R. Schock, and Frank
E. Thompson, Chicago, Ill., assignors, by di
rect and mesne assignments, to Olga. Craven
Hulbert, Chicago, Ill.
Application May 29, 1933, Serial No. 673,465
8 Claims.
This invention relates to means for aiding com
bustion in'furnaces and the like of the type in
which a body member exposed to the heat of the
furnace is adapted to discharge a commingled
5 blast of steam, air and furnace gases into the
furnace.
An object of the present invention is to pro
vide an improved apparatus of the above type
to accomplish the novel results herein set forth
l0 and with this‘ end in view the improved means
includes a heat‘ exchange body member directly
exposed to the heat of the ?rebox and provided
with an extended path therethrough for atmos
pheric air, whereby the air is preheated before
15 its discharge from the body member and before
contact with the steam, a passage intermediate
its length for admitting gases from the ?rebox
to the. body for commingling with the preheated
air before said discharge and means for com
20 mingling steam under pressure and at a high
velocity with the preheated air and ?rebox gases
subsequent to ‘preheating of the air and prior
to the discharge of the commingled preheated
air, ?rebox gases and steam from the body
25 member.
In our improved means we thus provide that
the steam is progressively raised in temperature
Within the device to maintain and enhance its
potential energy.
30
.
i
In the accompanying drawing, Figure 1 is a
horizontal sectional view through a corner por
tion of a furnace ?re-box and through a highly
advantageous form of the present combustion
device.
35
.
Fig. 2 is a vertical sectional view on the broken
line 2—2 of Fig. 1, the section being on the mid
dle line of the device;
Fig. 3 is an enlarged cross-sectional view on‘
the line 3——3_of Fig. 2; and
40
.
(01. 110-52)
a pair of openings I1 into the hollow interior
of tube l4. At vl8 the space between‘tubes‘ i2
and
I4 is
open:
>
-
'
r
"
-‘
A pipe l9, used to hold parts together, is held
rigid with the outer end of the body [0 'by‘a'rpa‘ir “5
of nuts 20 and ‘2| threaded on the ‘pipe and clamp
ing between'them the ?at end 22 of body Ill.v This
pipe l9 passes loosely through ‘the outer sup
port l6, and the nut 24 threaded at the outer end
of pipe‘ l9 draws upon the body illl and causes
the upper and lower stops 26,‘ 26, Fig.2 (one
shown dotted‘ in Fig. 1) against the ?xedstop
or tube l2, and thus the body Ill is held rigidly.
The body may be adjusted, by loosening'nut ‘21,
so as to direct its out?ow-higher or lower ‘with
respect to the fuel bed.
_
i .
l '- l '
The pipe 21 within pipe 19 leads "to the‘st'eam
supply through pipe connections‘ 21a. A‘ cover
28 protects the air entrance and‘has ‘an‘intake
opening at 29, Fig; 2.
' ‘
'1
'
'
The body I0‘ has a pair of openings‘ 30 admit
ting outer .air into the hollow interior‘ at end
portion 3|, which hollow interior‘divii'des into two
branches 32, and these come together in the hol
low discharge end or nozzle 33-.
-
'
-
‘
these end and side walls merge into the outer
shell of the body, all the walls of which are ‘inte
gral with each other.
Vertical passageways
opens into dischargepassageway 33a by a‘ tube
38 Aintegral
supportwith
40 extends
end wall
between
‘35.1
side
‘1 l walls» 36'iand
'l
3"- and is integral therewith, and'azpipe illt'ex
tends through this support ‘40pandrhas‘at-its
free end a stream jet nipple 42 having a- jet
ori?ce at 43 and outwardly-?aring walls 44.‘ Pipe
4| connects with steam pipe 21 at 45.‘
"
'
The? body It] becomes highly heated by the
gases playing about it and by radiant'hea't of
the ?re and ?re-box walls, and the heat ‘of body
ill heats the air passing through it. At .the
fractory metal. Cast iron would serve, although
reduced passageways 32 the furnace heat is ap
plied on all sides of substantially narrow and
elongated bodies of air, thus heating the airin
and a highly refractory material is preferred.
For application in the corner ‘of the ?re-box the
body H1 is specially shaped. It changes its direc
50 tion at l I so as to extend at its outer end at right
angles to front wall I3 of the ?re-box and in
line with the inner iron tube vI 2 imbedded rigidly
in that wall. Also imbedded in wall I3 is the
outer iron tube l4 having the ?ange I5 and the
55 diametric cross piece 16 which medially de?nes
20
Within? the enlarged middle part“ of the body
is a substantially vertical passageway 9 de?ned
by end walls 34, 35 and side wa1ls36, 31,‘ and
Fig. 4 is a vertical sectional view through the
‘steam nozzle and associated parts.
The device illustrated comprises?rst a hollow
elongated bulbous body Ill, cast from highly re
45 there are other much more refractory metals and
other materials available in the open market,
15
i'
tensively just before it is commingled with steam
and furnace gases.
‘1
The steam jet nipple is in vertical intermediate
passageway 9. The part Ma of pipe 4! is exposed
to the furnace gases in thatrpassagewayfandithe
temperature of the steam is thereby raised.
One of the important achievements is that .the
amount of steam used is greatly reduced. This
is due to the unusually ,large proportion of ' air 55
2
2,082,696
entrained for discharge into the ?rebox. It will
be noted from the dotted lines in Fig. 2 how the
diverging
steam-and-furnace-gas
impinges
against the inner surface of discharge nozzle
33, with the result that the maximum amount of
air is drawn in through the passageways 32.
The rate of travel of the air is very high, and we
introduce into the ?re-box a very much larger
amount of air, in a given time, than according
10 to any such device heretofore, and this is done
discharge end portion of the device.
2. A combustion-aiding device of the character
described comprising a hollow body having an
intake for air and a discharge portion providing
a discharge passageway, said body having walls
de?ning an intermediate transverse passageway
for furnace gases, said intermediate passageway
having an opening into said discharge passage
with a greatly reduced quantity of steam. This
air is also more intensely heated than hereto
way coaxial with the discharge passageway, and
a pipe for steam having a steam jet nipple in said
fore, and, through the commingling of the steam,
intermediate passageway and being directed to
ward said opening.
pre-heated air and furnace gases, the oxygen
15 present is rendered highly available for its de
sired action.
The operation is as follows: Steam issues at
‘high velocity as a comparatively ?ne jet from
steam nozzle 42, the jet being somewhat smaller
than what has been usual in devices of this
general class. For example, in a device of given
general proportions, where a prior device will
employ a nozzle throat of about a quarter of an
inch in diameter we will use a nozzle having a
25 jet ori?ce of Venturi formation with a throat of
about an eighth on an inch in diametenwhile
producing the superior results herein pointed
out, such as enhancing the velocity of the steam,
etc.
30
The jet ori?ce 43 is desirably of a diameter
at its smallest point of about an eighth of an
inch, some variation being permissible up to say
7/32 of an inch in some instances, with a well
rounded approach to this smallest diameter, and
35 from this smallest diameter ?ares outwardly
therefrom at an appropriate angle of divergence,
as shown, whereby the ori?ce is of Venturi con
?guration to best control both pressures and
velocities for the purposes of this invention.
The steam pressure in pipe 4| may be varied
at valve 50 according to the needs for different
installations or from time to time. Furnace gas~
es are entrained at steam jet nipple 42 in pro
portion to the pressure used, at this point the
45 steam being regenerated by the furnace gases
and potential energy being restored to the steam,
and the commingled steam and such gases flow
through the steam-and-furnace-gas tube 38.
This action entrains pre-heated air from the
50 passageways 32, and this air is there commingled
with the steam-and-furnace gases, and the com
mingled hot air, steam and furnace gases issue
through the ?nal discharge passageway 33a of
discharge nozzle 33.
55
box gases in said intermediate passageway and
commingle them with such steam and air in the
Various changes and modi?cations may be
made without departing from the invention, and
we contemplate as being included in these im
provements all such changes, variations and de
partures' from what is thus speci?cally illustrated
60 and described as fall within the scope of the ap
pended claims.
We claim:
1. A combustion-aiding device of the character
described comprising a hollow body adapted to
65 extend into a ?re-box and being open at one end
portion to receive air and open at the other end
portion to discharge into the ?re-box, said body
being enlarged intermediate its ends and having
walls at said enlarged portion dividing the hol
70 low interior of the body into branches thereat,
said walls also de?ning a transversely-arranged
intermediate passageway for ?re-box gases, said
intermediate passageway opening into the dis~
charge end portion of the device, with means
75 providing a jet of steam directed liq @Iltrain ?re
3. In combination with a ?re-box wall, an 15
inner anchoring member and an outer anchor
ing member held by the ?re-box wall and de
?ning the end portions of an air passageway
formed through the wall, a combustion-aiding
device seated against said inner member, pipe
means secured to said device and extending to
said outer member, with means holding said
pipe means to the outer member, and a steam
pipe extending through said pipe means and
25
into said device.
4. In a combustion-aiding device of the char
acter described, the combination including a hol
low metallic body of highly refractory material
for exposure at least in part directly to the ra~
diant heat of a ?rebox, said body having an in
take portion and a discharge portion angular
thereto providing therethrough a materially ex
tensive pathway for the passage of outer air
through the body into the ?rebox, whereby said
air is highly preheated before discharge thereof 35
from the body, a passageway through the body
intermediate its length for admitting gases from
the ?rebox thereinto for commingling with the
preheated air before said discharge, and means
for commingling steam under pressure and at 40
high velocity with said preheated air and ?rebox
gases in said body in the vicinity of the discharge
end of said pathway and subsequent to preheat
ing of the air but prior to discharge of the com
mingled preheated air, ?rebox gases and steam 15
from the body.
5. In a combustion-aiding device of the class
described for use with a furnace ?rebox, the
combination of a hollow body having walls of a
sinuous character exposed within the ?rebox to 50
?rebox heat to become highly heated thereby,
said body having a bulbous enlargement inter
mediate its length and a restricted discharge
nozzle of somewhat Venturi formation, a steam
jet nipple also of somewhat Venturi formation 55
within the body coaxial with the discharge nozzle
but terminating in said bulbous enlargement
short of the discharge nozzle, means associated
with the bulbous enlargement immediately ad~
jacent the steam jet nipple for the passage into 60
the bulbous enlargement of furnace gases, and
means for passing air into the bulbous enlarge
ment from the end of the body opposite the dis
charge nozzle whereby commingled steam, pre
heated air and furnace gases are discharged to
65
gether from the said nozzle into the ?rebox.
6. As an article of manufacture, an elongated
hollow body of highly refractory metal, said body
having a somewhat Venturi-shape discharge por 70
tion at one end thereof, an inlet portion at‘ the
other end having its axis at an angle to the axis
of the discharge portion, and an intermediate
somewhat bulbous portion, web-like members
extending across the inlet portion and the bulb 75
3
2,082,696
ous portion respectively for supporting a central
steam pipe, and a passageway into the bulbous
portion adjacent the said support which extends
through said bulbous portion.
7. Combustion-aiding means of the class de
scribed comprising, in combination with a fur
nace or the like, a hollow heat exchange body ex
posed to the heat of the furnace ?re-box, means
for admitting outer air through said body into
the ?re-box including an extended pathway
through said body for preheating the air pass
ing therethrough, a passage in said body inter
mediate its length for admitting gases from the
?re-box for commingling with the air in the
body, and means for commingling steam within
the body under pressure at a high velocity with
the preheated air and ?re~box gases subsequent ‘
to preheating of the air and prior to discharge
of the commingled preheated air, ?re-box gases
20 and steam from the body.
8. Combustion-aiding means of the class de
scribed comprising, in combination, with a fur
nace or the like, a hollow body exposed to the
heat of the furnace ?re-box, means for admitting
outer air through‘ said body into the ?re-box in
cluding an extended pathway through said body,
said body having walls of a sinuous character
whereby the direction of said air is changed in
said body and said air is preheated before the
discharge from said body, a passage in said body
intermediate its length for admitting gases from 1O
the ?re-box for commingling with the air in the
body, and means for commingling steam within
the body under pressure at a high velocity with
the preheated air and ?re~box gases subsequent
to preheating of the air and prior to discharge
of the commingled preheated air, ?re-box gases
and steam from the body.
WILLIAM R. HULBERT.
DANIEL R. SCHOCK.
FRANK E. THOMPSON.
‘
20
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