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Патент USA US3053526

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Sept. 1l, 1962
3,053,524
L. D. HOADLEY ET AL
TUYERE AND BosH COOLING SYSTEM
Filed Sept. 24, 1959
\
lo
I
BY
RICHÀRD H. MORGAN
ATTORNEYS
3,053,524
f.
United States Patent O ” 1C@
Patented Sept. 11, 1962
I
2.
3,053,524
entire tuyere and bosh areas of the furnace Wall. Adja
cent to each tuyere 5 the tuyere breast area is cooled by
'I‘UYERE AND BOSH COOLING SYSTEM
Lemuel D. Headley, Dearborn, Robert J. McGrath, Wy
andotte, and Richard H. Morgan, Trenton, Mich., as
Ègrllors to National Steel Corporation, a corporation of
e aware
Filed Sept. 24, 1959, Ser. No. 842,114
3 Claims. (Cl. 266-32)
two symmetrically disposed 'tuyere breast cooling mem
bers or elements 13 and 14 to the left and right respective
ly of the tuyere. In the interest of brevity only tuyere
breast cooling member 13 will be described in detail:
member `13 is divided into three sections, section 15 be
low the tuyere level, vertical section 16 at the side of the
tuyere, and section 17 above the tuyere level. Each sec
The invention relates to an improved temperature con 10 tion is made up of a U-shaped element with the legs
trol structure for blast furnace walls, more specifically,
an improved system for cooling the tuyere breast and bosh
regions of a blast furnace.
Blast furnace structure can generally be divided into
three main parts: ( 1) a lower section known as the
hearth, the bottom portion of which serves as a receptacle
welded to the tuyere breast plate. The sections below
and above the tuyere levels 15 and 1'7 are closed at the
ends and include baffle plates 18 and 19’ respectively.
Section 16 is an open ended U-shaped element connect
ing openings in the legs of sections 15 and 17. Cooling
fluid enters the member v13 at inlet 2t)` and follows the
tortuous path indicated by the flow arrows and exists from
for the molten metal and slag; (2) an intermediate sec
the upper portion of section 17 via the outlet 21. The
tion known as the “bosh,” `an inverted frustrum of a cone
structure of the tuyere breast cooling member 14 is iden
located immediately above the hearth; and (3) an upper
section known as the shaft or stack. The hot blast is sup 20 tical to that of the tuyere breast cooling member 13
but it is symmetrically reversed on the right side of tuyere
plied to the blast furnace through the tuyeres. The
5. The structure of tuyere breast cooling members 13`
tuyeres, usually approximately twenty »in number, are
and 14 is repeated for each tuyere around the circum
distributed symmetrically about the upper portion of the
ference of the furnace.
hearth. The refractory materials employed in the dif
The bosh cooling assembly includes cooling elements
ferent sections of the furnace can vary with conditions 25
22 which are distributed about the circumference of the
to be met in the area. The temperature in the tuyere
furnace at the bosh area. These bosh cooling elements
region is usually the highest found in the blast furnace
are elongated channel shaped elements extending be
and is `approximately 3600° F.; the middle bosh region
tween the tuyere region and the stack region of the fur
temperature is approximately 3000° F.; the upper bosh
region is approximately 2800° F.; and the lower portions 30 nace with their legs welded to the bosh plate and their
ends closed. Each bosh cooling element 22 about the
circumference of the furnace has a lower inlet 23, and an
nace were the thick-wall type and cooling of the refractory
upper outlet 24.
was effected by imbedding hollow cooling plates in the
In FIGURE 1 it can be seen that individual tuyere
thick refractory wall at regular intervals. More recently, 35 breast cooling elements are connected in a special arrange
ment to individual bosh cooling elements via individual
thin-wall refractories made of carbon have been used in
of the stack are at approximately 2100° F. In the past, the
common refractories used in the hotter regions of the fur
these hotter portions of the blast furnace structure.
When the thin-wall refractories are employed a heavy
conduit means. Thus, tuyere breast cooling member 13
is connected by pipe 25 to a bosh cooling element 22
circumferentially displaced relative to Ituyere breast cool
steel-plate jacket surrounds the refractories, lending sup
port to the blast furnace structure. Cooling such blast 40 ing member 13 and preferably relative to the tuyere
cooled by this same member 13. The cross sectional
furnace structure, especially in the tuyere and bosh areas,
as presented complex problems beyond the scope of con
areas of members 13 and 14 and elements 22 are such
that the desired velocity of water is maintained through
ventional cooling means.
It is therefore an important object of the invention to
out each path through them.
provide improved cooling for the tuyere breast and bosh 45
In the operation of the improved cooling system of the
regions of blast furnaces employing thin-wall refractories.
invention, the cooling medium, usually water, travels
In the accompanying drawings:
sequentially through a tuyere breast cooling member, a
FIGURE l is a view in elevation of a portion of the
conduit and a bosh cooling element. For example, water
cooling system for the tuyere breast land bosh areas of a
enters -tuyere breast cooling member 13 through the in
50 let 2.0, follows a tortuous path around the baffle 18,
blast furnace, in accordance with the invention,
FIGURE 2 is a view in vertical section of a portion
travels upwardly lalong the tuyere 5 through section 16,
of a blast furnace wall between `the hearth and stack sec
passes through section 17 following the tortuous path
tions taken on the line 2--2 of FIGURE l, and
defined by bafñe 19, and exits through outlet 21; pipe 2‘5
FIGURE 3 lis a partial horizontal section of the cooling
connects outlet 2.»1 with inlet 23- of a bosh cooling element
system of a portion of the bosh area taken on the line 55 22; »the cooling medium then travels upwardly through
3-3 of FIGURE 1.
the bosh cooling element 22 to an outlet 24 located at
In the blast furnace illustrated in FIGURES 1 to 3
the upper region of the bosh cooling element. Each
inclusive, thin wall refractories 4 are used in the tuyere
tuyere breast cooling member has 1a drain and clean-out
region of the furnace. The refractories '4 are supported
plug 27 and each bosh cooling element has drain and
in the region of the tuyeres 5 by the tuyere breast plate 6. 60 clean-out plugs 28 and 29 located for proper drainage and
A steel jacket 7, herein termed a bosh plate, supports the
cleaning of the respective elements as needed.
thin-wall bosh refractories 8. The stack area of the fur
The cooling system of the invention has peculiar ad
nace has thick wall refractories 9 With cooler plates 10
vantages in blast furnace operation. In the blast furnace,
imbedded therein. The tuyere breast cooling assembly,
molten and other particulate matter drain downwardly
designated generally as 11, is welded to the tuyere breast 65 through the blast furnace in contact with the refractory
plate 6. The bosh cooling assembly designated general
Walls. By having the tuyere breast cooling elements and
ly 12, is welded to >the bosh plate 7. In this manner the
the bosh cooling elements circumferentially displaced
tuyere breast plate and the bosh plate act »as part of the
furnace cooling system.
around the blast furnace, itis possible to clean one series
how the tuyere breast cooling assembly and bosh cooling
assembly cooperate to control the temperature of the
placement ofthe series-connected cooling elements results
Referring to FIGURE 1, it can be seen more clearly 70 of cooling elements without developing a hot spot or
damaging the furnace lining. The circumferential dis
3,053,524
3
in the vertical path traveled by furnace material crossing
two cooling zones in the furnace. Portions of this ver
tical path `are cooled by elements from separate series
connected flow passages.
In this way, an extended por
tion of the vertical path traveled by the particulate matter 5
is never Without cooling. Further, an advantage of em
ploying the plurality of cooling passages disclosed is that
hot spots, due to some phenomenon in the furnace opera
tion or a defect in the cooling system, can be readily and
accurately located by an observation of the temperature
of the exit cooling medium and remedial action can be
a plurality of tuyere breast cooling elements Welded
to the steel jackets at the tuyere area of the furnace,
a plurality of bosh cooling elements welded to the
steel jacket at the bosh area of the furnace, and
conduit means connecting tuyere breast cooling ele
ments in series with bosh cooling elements to define
coolant passageways extending in series over the
tuyere breast and bosh areas in which the series con~
nected tuyere breast and bosh cooling elements do
not lie in the same vertical plane normal to the blast
furnace wall.
3. In combination with a blast furnace wall including
directed to the area Where needed. Finally, by passing the
water through both tuyere breast coolers and bosh coolers
in series, full advantage of the cooling action of the
a tuyere area and a bosh area located thereabove, a tern
perature control system for tuyere and bosh areas of the
minimum amount of water can be obtained while main 15 furnace comprising
taining a check on the furnace wall temperature in a local
ized Zone throughout the circumference of the furnace.
It is to be understood that the form of the invention
tuyere breast cooling elements having multiple sec
tions deñning a coolant ñow path around each blast
herewith shown and described, is to be taken as a pre
ferred example and that various changes in the shape, 20
size, and >arrangement of parts may be resorted to without
departing from the spirit of the invention. Reference will
be had to the subjoined claims for a definition of the
limits of the invention.
What is claimed is:
25
1. In combination with a blast furnace Wall having a
thin wall type carbon refractory lining with steel jacketed
tuyere `and bosh areas, a temperature control system for
the tuyere and bosh areas comprising
30
a plurality of bosh cooling elements covering the bosh
area of the furnace,
a plurality of conduits connecting individual tuyere
breasts in series with individual bosh cooling elements
to form separate series connected cooling passages
in which the individual tuyere breast cooling ele
the bosh area of the furnace, and
conduit means connecting individual tuyere breast cool
ing elements in series with individual bosh cooling
elements to define separate series connected coolant
ñow paths in which the individual tuyere breast cool
ing elements and individual bosh cooling elements
do not lie in the same vertical plane normal to the
blast furnace Wall.
References Cited in the ñle of this patent
a plurality of tuyere breast cooling elements covering
the tuyere area of the furnace,
furnace tuyere,
a plurality of bosh cooling elements disposed around
35
ments and the individual bosh cooling elements con
nected in series do not lie in the same vertical plane
40
normal to the blast furnace wall.
2. In combination with a blast furnace wall having a
UNITED STATES PATENTS
277,638
320,586
499,188
591,524
614,381
769,665
2,396,976
2,697,598
and bosh areas, -a cooling system which is externally
1883
1885
1893
1897
1898
1904
Whitehurst __________ __ Mar. 19, 1946
Affleck _____________ .__ Dec. 21, 1954
FOREIGN PATENTS
thin-wall type refractory lining and steel jacketed tuyere
mounted on the steel jacketed areas comprising
Wendt ______________ __ May 15,
Probert _____________ __ June 23,
Giroux _______________ _, June 6,
Burgers _____________ -_ oct. 12,
Gaines ______________ __ Nov. 15,
McGee _______________ __ Sept. 6,
339,972
Great Britain _________ __ Dec. 17, 1930
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