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Патент USA US2405461

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Patented Àug. 6, 1946
UNrLrEo stars `rsnf
2,405,461 Y
John H. Sprow, Jackson, Ohio
Application August 22, 1945, Serial No. 612,015l
5 Claims.
(C1. 26e-41)
My invention relates to blast furnace tuyères. "
It has to do, more particularly, with va tuyère
for inserting a combination concentrated stream
of air, as well as a stream of air which has a
which will permit furnishing of a certain quantity
of air but in varied velocities to the» material in
the furnace.
Another object of my invention is to provide
spreading effect, into a blast furnace.
a tuyère which has two dimensions'in cross
In the past, many attemptsY have been made
sectional diameter which provides for a penetrat
to provide a blast furnace with a tuyère `having
ing blast and a spreading blast wln‘le at the same
a blast of air which will penetrate to the’center
time maintaining the same total quantity of air
of the furnace and, at the same time, will permit
inserted in the furnace.
the spreading of air around the sides of the 10
Another object of my invention is to provide a
furnace in order to aid in the reduction of the
tuyère having its inner side wall surface divided
ore and fuel at that point as well as at the center.
into four sectional units, two of said units being
In other words, a tuyère which furnishes a pene
spaced closer together than 4the other two units
trating blast of air that does not have a, spread
yet forming no obstruction to the blast of air
ing iiow. To overcome this difficulty, it has been 15 inserted from the blast main.
necessary to make and position tuyères of two
Another object of> my invention is to provide a
sizes in the furnace in order to accomplish this
tuyère which will more eiiiciently reduce thema
uniform reduction ` of materials placed in the
terial in the furnace by a uniform distribution
blast furnace. The main diñiculty in using two
of air blast to the center of `the furnace as well
sizes of tuyères is that it cuts down the overall
as around the sides thereof.
blast into the furnace and thus reduces the
Another object of my invention is to provide a
eii‘iciency of the furnace. Various devices have
tuyère which will have a penetrating blast action
been inserted in tuyères for varying cross-sec
and at the same time substantially reduce the
tional size, but they> have quite generally re
formation of ypilasters around the sides of the
sulted in the formation of back pressure and 25 bosh portion of the furnace.v
ineñ‘icient blasting. At the present time, narrow
Another object of my invention is to provide a
tuyères are placed along vside of wide-nosed
tuyèere having at least two diameters in cross
tuyères in thel bosh of the blast furnace. The
section which will facilitate a reduction of the
narrow tuyères give the penetrating blast while
ore uniformly throughout the furnace.
the wide-nosed tuyères give a fan-like spreading 30 Various other objects and4 advantages will be
action for aiding in the reduction o-f the mate
apparent from the following detailed description
ral at> thesides of the furnace. Even with the
and the drawing where-in similar characters of
great number of tuyères now positioned in the
reference designate corresponding parts and
furnace, there is still an uneven distribution, and
where the narrow tuyères appear inthe furnace, 35 Figure 1 is a front end View of the tuyère, con
pilasters or slag deposits form around the sides
structed according to my invention, taken along
of the furnace adjacent> the narrow-nosed tuyère.
line l-l of Figure 2.
This formation of the pilasters greatly'reduces
Figure 2 is a vertical sectional view of the
the life of the individual tuyère, therefore, neces
tuyère taken along line 2~--2 of Figure l.
sitating replacements sooner than ordinarily ex 40
Figure 3 is a rear end View of the tuyère taken
pected. Furthermore, as indicated above, the " along line 3-3 of Figure 2 and showing the
use ofthe narrow or small-nosed tuyère reduces
plugged opening for water cooling the tuyère.
the amount of air forced into the furnace and
Figure ‘l is a fragmentary perspective View of
this reduction is noticeable in the resulting prod
the ` tuyère, partly in section, illustrating the
uct. All blast furnaces have certain capacities, 415 marked taper of one of the sections of the inside
and if any element, either fuel, ore or air, is " surface.
varied, it vitally aiiects the operation of the fur
Figure 5 is a side elevational View of the lower
nace. To overcome the above difficulties, appli
end of the blast furnace showing the location
»cant has devised a tuyère having -the following
of the tuyères with reference/to `the bosh and
advantages over present-day tuyères.
One of the objects of my invention is to provide '
Figure 6 is a top -plan View of the tuyères in
a tuyère which is capable of furnishing both a
Iplace in theblast furnace taken along line ’SQ-6
penetrating and spreading blast in a furnace. ~
of Figure 5'and showing thetwoff'old distribution »
Another object of my invention is to provide a
of the air blast.
.tuyère of varying cross ‘sectionl'at -thelnose end u55
Referring to theV drawing, more- particularly to
Figure 2, I illustrate a hollow tuyère I of frustro
conical shape. The tuyère I is tapered toward
For example, if the particular furnace require
the nose end 2.
ments call for a more penetrating blast, the
tapered segment 6 can be made 4-inches in diam
The tuyère I is provided with a conventional
water jacket 3 for keeping the inner wall sur
faces cool and said water jacket is supplied with
a steady stream of water through a plurality of
orifices 4 shown at the rear end thereof of the
tuyère in Figure 3.
duce the proper blast of air required within the
eter, and the wider portion 5, 6-inches in diam
eter. It will be seen that this area will be of the
same ratio as that of a 5-inch tuyère and still re
tain the velocities and penetration characteris
tics of the tuyère.
While I show in Figure 1 the vertical diameter
the widest, it is understood that the tapered diam
-The inner wall surface of the tuyère is so
formed as to provide four longitudinally extends
ing wall segments each of which varies in width
throughout; its length. These segmentsjconsti
tute the diametrically opposed pair „of Walls 5
and the diametrically opposed pair of walls 6
which pairs are located at rightH-anglestdeach
eter 6 can be positioned along the vertical axis
and have the Widest diameter portion of the
tuy'ère'nose 'along the horizontal axis. This type
of. tuyère may be rotated to different positions at
intervals so 4that pilasters which form adjacent
the narrow-nosed portion 6 of the tuyère can be
burnt off by positioning the wide-nosed portion
other. Along the longitudinal edges of the walls
‘à there are provided the shoulders 6a that taper
rearwardly from the nose 2 to a point where
they 'converge with the walls 5, as athâa.A Thus, 20 5 of the tuyère and turning the narrow-nosed
portion tò’the .position where the widèëñòsëd 'p'ör
as shown in Figure l, the walls 6 :converge towards
tion had been. Furthermore, Ywhile I 'show ‘the
tuyère nose as being divided 'into quarter ség
each other at the nose resulting in a reduction of
the diameter of the nose at this area. ‘Conse
quently, there results a tuyère which has a- narrow
me'nts, it is understood that I also wish 'to ‘use
a tuyère wherein a plurality of varying diameters
nose portion and 'a wide nose portion ¿at~ right
angles to eachother. The diameter of ¿the rear
end'of 'the tuyère, however, is uniform. This wall
arrangement in a single tuyère produces'a 'com
bination tuyère blast which will have -both ’a -pen
etrating and a spreading action which must usu
aregpresent at the'nose'end and not necessarily
limited to two, as shown'in the c’l'ravvin'g.` Itis
understood that the tuyère can be divided‘into
a v‘number of other segments which may have
characteristics similar to- the present type of
tuyère shown inthe aèco'mpanyiñg drawing. 'Aït
ally be accomplished by having vboth'a wide-nose
and a narrow-nose tuyère.
is ßimportant. that the degree of Ataper Yof the
smaller diameter Vsegment atthe 'nose endbef-_vei'y
In other words, the tuyère lI illustrate in the
figures of the drawing will permit a blast of air
- slight along -the Wall of 4the -tuyère «so that `it
comesuto a fine point at the -back ‘end of the tuyère.
If the taperNi's too marked, back Apressureswill be
created in the tuyère which are definitely unde
siderable. It is myrintention, therefore, _that -the
tapered >segments coincide with ¿the Acircular 'sur
face ofthe sider Wall 5 at the .point "5a, at >the
into the furnace of the type shown vin Figure 6
which has 'a concentratedstream to the center
and also a spreading stream which allovvs‘a uni
form distribution 4of the charge ‘of vair‘over Vthe
entire interior area of the furnace. AS will bev
seen `from Figure 2, ‘the tapered wall segment 6
rear end of the tuyère. _»At‘th'e nose endof the
tuyereLI disclose a thickened portion shown best
varies in kcross-sectional diameters‘ofV the tuyère
and the air passing through v‘the tuyère will be
concentrated by the narrower "diameter along
invFigure ‘l >by Athe numeral 6.
_A nI/_t will AIce apparent _from lthe-above description
thai-,_1 have provided a tuyère having many ad
vantages over >present-day tuyëres in use in blast
furnaces. AThis tuyère has the equivalent-flow
o_fV air _as -both a Ywide or narrow-nosed tuyère
the horizontal axis dueto 'theïn’ar’row‘nosed por- ¿
-tioned formed by the tapered`wall segment `(â and
the air ‘passing alongthe regulartapered wallipor
tion 5 will Aproduce va spreading action. I thus
provide a tuyère which is in'eifeot‘equiva‘lent of
and >also’retains the proper amount ofair blast
two tuyères of varying sizes.
YI have found that vtapering the two 'equal Vseg 50 required for the type furnace >in use. ÀThe varia
tion _of the cross-sectionalearea ofmywtuyereperf
ments of the wall portion of a tuye'rein this
manner does not form -back pressures upon the
blast main 3 shown in Figure 5. Pipes 1 "are
connected to the rear ends of the tuyeres 1 vand to »_'î
the blast main 8 which is suspended yabout the 55
furnace by means of the hangers '9.
In Figure 5 of the drawing, I show the loca
tion of the tuyeres I at the bottom of the bosh
of the furnace just‘above vthe hearth. I also pro
vide openings I0 and II which are ofthe `lcon
ventional type taps for flowing the slag andthe
molten metal out of the furnace 'at intervals.
larly adaptable to preventthe Vformation of rpilas
ters around the nose ofthe tuyère andfalsof-mai-nf
of the furnace. »Anotheradvantageof my tuyère
is that it »is simple in construction y-and does-not
form back pressure as >do -other tuyères having Vre
stricted nose end openings., Many other 4advan
tages will be-apparent from »theabove description,
Figure '6 illustrates the spread of air as ‘well as `
the spreading blast.
o_re_ in a more efficient manner. ¿It‘willïbe seen
that this tuyère is so designed -thatfitïis »particu
tain a concentrated blast vof --airdnto the center
the concentrated blast which reaches tothe-center i «
of the furnace._ The tapered wall segments ‘E fof
the tuyère furnish the means for 'the ’concen
trated blast while 'the 'wall segments 5 furnish
mits both a penetrating and «aspreadingblast of
air'into a furnace thus aiding the reduction of »the
the drawing and the following claims.
y Having thus 'described my invention, what I
claim is:_
l. iA» -blast furnace tuyère »of -frustroeconical
shape îhaving «a circular' 'rear end` portion "andqa
nose end portion having -oppositely spaced r`cir
70 cular arcs formed >by taperingY parts rof’the »wall
With this arrangement, I am able to vary fthe '
blast in velocity and still maintain’th'e same'cross
sectional area of tlie‘tuyère by making the diam
eteriof the 'wallrportions indicatediby'the seg
ments 5, one-half inch larger than `the‘usual
intermediate ‘the vrear e'n'dfandA the'fnose en'di‘thus
formingthe saidcoricentriciarcs ófvaryiiig widths
so fas `to4 vary' the 'velocity 'and ldirection "of -the
rtuyère 'size 4and -by >reducing the' àdiameter `of ‘the " f Fair inserted "in ‘the ’rear end 'of‘ 'the ltuyère' 'to ' be
wall 6, one-half inch. This enables me to pro
75 forced into the blast furnace.
2. A tuyère of the type described comprising a
tapered wall portion, a second wall portion ta
pered to a greater degree than Said first-men
tuyère presents two diameters for inserting air in
varying velocities and directions.
4. A tuyère of the type described having a cir
tioned wall portion, saidrwall portions forming
cular rear end portion and a nose portion includ
segments of a circle which vary the diameter of
ing concentric arc segments of varying diameters,
the nose end of the tuyère, said segments hav
the inner wall of said tuyère including wall seg
ing similar segments oppositely disposed and ta
ments arranged in pairs of oppositely disposed
pered in the same degrees, respectively, as said
walls, the walls of some of said pairs converging
first two-mentioned segments so that the diam
towards each other and towards the tuyère axis to
eter of the tuyère at the nose end presents two
agreater extent than other of said pairs.
diameters for inserting air in varying velocities
5. A tuyère of the type described having a nose
and directions.
portion including sections which are relatively
3. A tuyère of the type described comprising a
angularly disposed and are of varying widths so
tapered wall portion, an additional wall portion
as to direct the tuyère blast differently, the inner
tapered to a greaterdegree than said first-men 15 wall of said tuyère including wall sections ar
tioned wall portion, said wall portions forming
ranged in pairs of oppositely disposed Walls, the
segments of a circle which vary the diameter of
walls of some of said pairs converging towards
the nose end of the tuyère, said segments having
>each other and towards the longitudinal center
similar segments oppositely disposed and tapered
line of the tuyère to a greater extent than other
in the same degree, respectively, as said ñrst 20 of said pairs.
mentioned segments so that the nose end of the
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