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Патент USA US3083966

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April 2, 1963
H. T. STIRLING
3,083,956
CONTINUOUS RADIANT FURNACE SINTERING MACHINE
Filed Dec. 31. 1957
3 Sheets-Sheet 1
INVENTOR.
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April 2, 1963
H. T. STIRLING
3,083,956
CONTINUOUS RADIANT FURNACE SINTERING MACHINE
Filed Dec- 31. 1957
3 Sheets-Sheet 2
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April 2, 1963
H. T. STIRLING
3,083,956
CONTINUOUS RADIANT FURNACE SINTERING MACHINE
Filed Dec. 51, 1957
3 Sheets-Sheet 3
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3,083,956
Patented Apr- 2, 1953
2
1
3,083,956
CONTINUOUS RADIANT FURNACE
SINTERKNG MACHINE
Harold T. Stirling, l’ittsburgh, Pa., assignor to Koppers
Company, Inc., a corporation of Delaware
Filed Dec. 31, 1957, Ser. No. 706,518
2 Claims. (Cl. 266-21)
nozzles are set in the upper half of the exit wall of the
furnace so as to have their axial centers at a level to
impinge or project through the middle of the vertical
height of the entrance wall of the housing rather than on
to ‘the bed on the strand, to spread out and cover a large
area.
A system as thus devised has been in actual use and
found performing in its expected superior manner for
This invention relates in general to apparatus for sinter
preventing hot spots in the bed while satisfactorily ac
ing and heat hardening beds of solid material, and more
complishing the aforesaid advantages over non-radiant
particularly to improvements which promote uniform dis 10 type continuous sinter strand furnace systems. The in
tribution of the heat and thus prevent hot spots in the
vention is not limited in all its aspects to sintering of ore
sinter bed, in an apparatus of the continuous sinter strand
as such, as above-described but is equally applicable to
type with a radiant type ignition furnace for tiring or
heat hardening other strand bed materials, such as ?y ash,
heating the top of a bed on the strand of pallets as they
pass continuously over a wind box for exhausting the gases
from the alletbed.
More especialli, the invention is directed to an im
ferrous and non-ferrous materials requiring pelletizing,
in the form of green pellets or bailed ?nes, with and
without admixture with fuels to provide the heat for
hardening or fusing, as in the formation of lightweight
provement attaining this end in apparatus of this general
aggregate.
type which heretofore have had for their main operating
In addition to the general objects recited above, the
20
characteristic, a downwardly opening refractory lined
invention has for further objects such other improve
radiant heat chamber with vertical walls, and arched roof
ments or advantages as may be found to obtain in the
parallel or transverse to the strand travel, and a row of
apparatus hereinafter-described and claimed.
fuel burner nozzles set in the ‘brickwork of the exit walls
In the accompanying drawings forming a part of this
of the furnace at an angle so that the direction of ?ame
speci?cation and showing, for purposes of illustration,
25
is countercurrcnt to the strand travel with the flame im
the best mode of embodying and practicing the invention.
pinging on the bed and spreading out to cover a large
area of the bed on the pallets as they pass under the
FIGURE 1 is a side elevational view of a continuous
sinter strand apparatus with the novel furnace features
ignition furnace.
In operation, such system is of particular advantage
therein;
systems ‘because with this radiant type system it is possi
ble ‘to operate by burning blast furnace gas, coke oven
line 2C~2C of FIGURE 3;
FIGURE 3 is front elevational view partly in section,
FIGURE 2 is an enlarged vertical sectional view of the
over non-radiant type continuous sinter strand furnace 30 novel parts of FIGURE 1, the section being also on the
gas, or mixed ‘blast furnace and coke oven gas, and in so
doing considerabiy increasing the sintering per square foot
of grate ares, dec
the hot sinter returns to about one
taken on the lines 3B—3B and 3A-—3A of FIGURE 2.
Referring to the drawings:
There is shown a standard sintering machine of the
fourth, reduce dust in the discharge area considerably,
continuous sinter strand type of the endless conveyor
strengthen and harden the top of the sinter bed, as well as
type comprising an upper strand 10, pallets 11, and a
reduce ‘the amount of coke in the mix, and increase the
lower strand or run 12 mounted for rotation by means
blast furnace production considerably with a still better
of sprocket wheels 13. In the upper run or strand the
quality of sintcr produced by the use of this type of igni 40 pallets ride along rails 14 by means of rollers 15 and
tion burner over other types of non-radiant heating sinter
return on rails 14'. Wind boxes 16 are arranged longi
ing furnaces.
tudinally below the upper strand 10, which as usual are
A drawback to such system has been that the distribu
provided with dust collecting hoppers 17 and are also con
tion of heat is not uniform and as a result hot spots are
formed in the sinter bed due, apparently, to the arched
formation of the roof of the furnace in conjunction with
the angle of impingement of the flame on the bed by the
burners to spread the flame out to cover a large area.
The primary aim of the present invention is the modi
?cation of this sintering furnace system in a manner to
retain its aforesaid advantages while eliminating these
disadvantages in a manner to promote uniform distribu
tion of the heat from the burner nozzles, thus preventing
hot spots in the sinter bed.
Accordingly, the present invention provides for the
purpose a continuous sinter strand system with a radiant
ignition furnace as aforesaid but having as a novel operat
ing characteristic an entrance ‘wall shortened relative to
the exit wall of the furnace and a generally ?at roof in
nected to a stack through a gas line 18 as well as sealed
by wear bars 19 and seal bars 20 in the conventional
manner.
As shown on the drawings, the conveying strand 10
moves to the left and sinter mixture is fed to the pallets
at a region to the right, in FIG. 2 and to the left in FIG.
I, of the dead plate 21 by sinter mixture feed means in
the form of a vibrating feeder pan 22 which deposits the
mix evenly and gently on the pallets throughout the full
width of the strand. Just before the feeder 22 a surge bin
23 is provided as a hearth layer feed means to lay down
a hearth layer on the grate. The top of the bed 108- is
ignited or, as with the present invention here, subjected
to a ?rst stage ignition at a region after the feeder ‘22 by
means of a radiant type ignition furnace 24.
The prepared bed 1.0a travels under the furnace 24 and
clined ‘from ‘the top of the exit wall down to the top of 60 out over further wind boxes and is fully sintered by the
the entrance wall, so that the roof slopes downwardly in
time it reaches the discharge end of the machine at the
a direction countercurrent to the direction of the strand
left as shown on the drawings.
under the downwardly open mouth of the furnace cham
The structure thus far described is typical of this type
ber.
of sintering plant and hence need not be described in fur
Another novel feature is that this radiant ignition fur
ther detail.
nace can ‘be raised or lowered or put on a slope if desired
while operating, in order to get optimum ‘burning without
shutting down.
In previous practice, the furnace 24 generally consisted
of an arc-shaped steel shell with a refractory lining com
prising vertical walls and an arc-shaped roof paralleling
With this change, the ‘burner nozzles are still in the exit
70 or transverse to the line of travel of the upper run, with
wall of the furnace at an angle to direct the flame into
a row of burner nozzles 25 set in the brickwork in the
the furnace countercurrent to the strand travel, but the
exit wall 26 of the furnace with the angle of the burners
3,083,956
4
3
particular form and manner but may be variously em
bodied Within the scope of the claims hereinafter made.
I claim:
and spreading out to cover a large area. In operation the
1. Apparatus for continuous sinter bed radiant furnace
operator aims to attain complete ignition across the bed
‘and burns enough gas to obtain a black top while avoid 5 heating, comprising: wind box means, a continuous strand
of sinter pallets mounted for movement across the wind
ing fusing of the surface of the bed to such an extent
boxes of said means, ‘means for continuously advancing
that bed permeability is disadvantageously affected.
the strand of pallets, hearth layer feed means to lay down
Ignition time should be approximately one minute, de
a hearth protective layer on the strand of pallets, sinter
pending on sintering plant operation. Therefore, if the
mixture feed means for feeding sinter mixture to the
sintering machine is long and can travel at a great rate
bed after the hearth layer feed means, a downwardly
of speed, for instance, 24 feet per minute, the furnace
opening refractory lined radiant heat chamber in posi
would be 24 feet x width of pallet or strand.
tion over the strand after the sinter mixture feed means
When the ignition furnace area is to be 24 feet x 12
for ?ring a bed on the strand and constituted of confront
feet, instead of having a single furnace 24 feet long, two
mg vertical tall and shorter walls, a generally ?at refrac
of the radiant type furnaces, each as long as the width
tory roof on an incline from the top of the tail wall to
of the strand, preferably are used in the series.
tht top of the short wall, a fuel nozzle set in the upper
In accordance with the present invention, the furnace
half of the tall Wall and ?xed at an angle in said tall wall
24 is constituted of a rectangular metallic framework 27
to have the central axis of the nozzle at a level to project
having a shorter refractory lined vertical entrance ‘wall
through the short wall above the base thereof and means
28 composed of horizontal courses of refractory brick and
to discharge the fuel so that its ?ame impinges on the short
a higher exit wall 26 of the same material, both mounted
wall above the base thereof and avoids direct impringe
on water cooled lintels 29. The chamber space between
said walls is unenclosed from their tops down forming
merit of the ?ame on the sinter mixture, whereby the ra
a downwardly opening radiant heat chamber 30. The
diant heat from said chamber ignites said sinter mixture
on said hearth layer.
top of the chamber is closed off by a generally ?at roof
31, downwardly inclined or sloped from the top of the
2._ Apparatus for continuous sinter bed radiant furnace
heating, comprising: the combination with wind box
exit wall 26 to the top of the entrance wall 28 and the
two opposite sides of the chamber are closed off by ver
means, a continuous sinter strand of pallets mounted for
tical walls 32 formed of refractory brick in superposed
continuous movement across the wind boxes of said
horizontal courses supported by water cooled lintels 29 30 means, means for continuously advancing the sinter
in the same manner as the vertical exit and entrance
strand, of sinter mixture feed means for feeding sinter
?xed so that the direction of the ?ame is countercurrent
to the strand travel, with the ?ame impinging on the bed
walls 26, 28. The furnace chamber area is as Wide as the
mixture to the bed, and a downwardly opening refractory
strand and as long, in the direction of travel of the strand,
lme radiant heat chamber in position over the sinter strand
after the sinter mixture feed means for firing the top of
as the width of the strand or upper run.
The inclined ?at roof 31 is constituted of interlocked 35 a bed thereon, with confronting vertical refractory en
vertical tile in a single course which are suspended from
trance and exit walls enclosed at the top by a refractory
a roof support 33 separate from the furnace frame sup
roof, and with fuel nozzles set in the exit wall and ?xed
port 34. Expansion joints 35 are provided for the in
at an angle to discharge ?ame into the chamber above the
clined roof which is also provided with three thermo
bed, characterized by said entrance wall being shorter
couple holes 36. The burner nozzles 25 are of the comb 40 than the exit wall, said roof being a generally ?at one
block type set in neck brick 27 in the upper half of the
inclined downwardly from the top of the exit wall to the
exit wall 26. These are ?xed for ?ring at an angle, to
top of the entrance wall, said fuel nozzles being set in tht
have their longitudinal axes 38 on a line, or at level to
project through, or impinge at, about the middle of the
vertical height 39 of the vertical entrance wall 28. These
nozzles 25 are fed with air through line 40 and gas
through line 41 of ?exible hose from air and gas headers
(not shown). The gas may be either coke oven gas or
blast furnace gas, or a mixture of these two gases.
The framework 27 is supported at the four corners
upper half of the exit wall at an angle ?xed to have the
central axes of the nozzles at a level to project through
‘the middle of the vertical height of the exit wall and
means to discharge the fuel so that its ?ame impinges on
the short wall above the base thereof and avoids direct
impmgemtnt of the ?ame on the sinter mixture, whereby
the radiant heat from said chamber ignites said sinter
mixture on said hearth layer.
of the furnace from the support 34 by four jacks in the
form of a turn buckle pivotally connected at their tops
to the framework 34 and likewise pivotally connected at
their lower ends to the framework 27.
In operation the ?ring is effected at a rate in corre
spondence with that above-described with the same or
better results, except that the distribution of heat is more
uniform, ?ame impingement directly on the top of the
bed 10“ avoided, thus preventing hot spots in the sinter
bed 10'“. Rotation of the turnbuckles at the corners raises GO
or lowers the furnace from and to the top of the bed on
the upper strand.
The invention as hereinabove set forth is embodied in a
References Cited in the ?le of this patent
UNITED STATES PATENTS
916,397
1,540,205
1,827,773
1,984,747
2,409,072
2,750,272
Dwight ______________ __ Mar. 23,
Cousin _____________ __ June 2,
Beasley _____________ __ Oct. 20,
Klencke _____________ __ Dec. 18,
Shallock _____________ _- Oct. 8,
Lellep _______________ __ June 12,
1909
1925
1931
1934
1946
1956
FOREIGN PATENTS
318,197
Great Britain __________ __ Feb. 27, 1930
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