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Патент USA US3051474

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Aug. 28, 1962
|_. WALTHER
3,051,463
COOLING MEANS FOR HOT BLAST STOVES
Filed March 3, 1961
/ FIGJ
/16’
.1
___.
INVENTOR.
LUDW IG
WALTHER
Bymmk
ATTORNEY
United grates
fire
3,051,463
Patented Aug. 28, 1962
1
2
3,051,463
from the following description considered in connection
with the accompanying illustrative drawings.
In the drawings:
COOLING MEANS FOR HOT BLAST STOVES
Ludwig Walther, Duren, Rhineland, Germany, assignor to
FIG. 1 is a schematic representation of a hot blast
stove showing the stove and some of its valves and con
Zimmermann 8: Jansen, G.m.b.H., Duren, Rhineland,
Germany, a corporation of Germany
Filed Mar. 3, 1961, Set‘. No. 93,144
duits leading thereto, illustrating the invention;
FIG. 2 is a schematic representation as seen by viewing
FIG. 1 along the direction of arrow 2; and
The present invention relates to improvements in hot
FIG. 3 is a fragmentary view partly in section, and
blast stoves of the type that are used to provide a stream 10 on a larger scale, showing the details of the burner shut
of hot blast to a blast furnace.
off valve and the passage of the cooling air therethrough
A hot blast stove of this type usualy operates cyclically
and into the stove, seen from the direction of arrow 3
between two other different conditions thereof, namely,
in FIG. 2.
an “On Gas” and an “On Blast” condition. During
Referring now to the drawings, and particularly to
the “On Gas” condition, the stove is being heated by 15 FIG. 1 and 2, reference numeral 10‘ indicates a hot blast
means of a gas-air mixture which is consumed in the
stove of the type which is used for providing hot blast to
combustion chamber of the stove causing resultant hot
a blast furnace. When such stove 10 is “On Gas,” air
flue gases to heat up the checker work of the'stove be
is introduced through conduit 12, gas through conduit
fore exiting through a chimney. During the “On Blast”
14, and the mixture passes through the burner shut-off
condition, cold air is forced through the stove, thereby 20 valve 16 into stove 10'. The combustion of this gas-air
passing through the checker work which has been pre
mixture produces very hot ?ue gases which pass through
viously heated during the “On Gas” condition. This
checker work 18 of the stove, heating the latter, and
cold air is thus being heated by the checker work and
then these ?ue gases escape through a chimney valve,
leaves the stove as hot air or hot blast ready to go into
schematically shown at 20. The solid arrows in FIG. 2
25 indicate the path of the air-gas mixture and ?ue gases
the blast furnace where it is required.
For a hot blast stove to be enabled to assume the
when the stove is “On Gas.”
“On Gas” condition, it is usually equipped with a burner
When stove 10 is “On Blast,” cold blast from the cold
which has a flame for igniting the gas-air mixture, 8.
blast main 22 passes through cold blast valve 24 into,
burner shut-off valve which functions to isolate the
stove 10, as at 25, where it is heated by the checker
8 Claims. (Cl. 263-19)
burner from the hot blast stove, and a chimney valve
work 18 and then leaves the stove through hot blast
through which the ?ue gases exhaust after heating the
valve 26 into hot blast main 2%, on its way to the blast
checker work. For the stove to assume the “On Blast”
furnace. The dot-and-dash arrows in FIG. 1 indicate
condition, it is usually provided with a cold blast valve
the path of the air blast when stove 10‘ is “On Blast.”
through which cold air is admitted into the stove, and
It will be understood, of course, that when stove 10 is
with a hot blast valve through which the heated air blast
“On Gas,” burner shut-off valve 16 and chimney valve
leaves the stove prior to its being introduced into the
26 are open, while cold blast valve 24 and hot blast
furnace. When a hot blast stove is “On Gas,” its burner
valve 26 are closed, and when stove ‘10 is “On Blast,”
shut-off valve is open, while its cold blast valve and hot
cold blast valve 24 and hot blast valve 26 are open, while
blast valve are closed. 0n the other hand, when the
burner shut-off valve 16 and chimney valve 20‘ are closed.
stove is “On Blast,” the burner shut-off valve is closed, 40 As can be seen from FIG. 1 and FIG. 2, burner shut
while the cold blast valve and hot blast valve are open.
off valve 16 is in very close proximity to hot blast valve
In constructing stoves of this type, it is common to have
26. Accordingly, the heat from the hot blast valve 26,
the burner shut-off valve in relatively close proximity
caused by the fact that the hot blast temperature at that
to the hot blast stove. This common occurrence is due
point is approximately 1000° C., is easily transmitted to
to good design practice dictated by the usual locations 45 the burner shut-off valve 16.
of the hot blast main, gas and air mains. There is,
The resulting heat rise in the burner shut-off valve 16
however, a problem which arises from such an arrange
must be dissipated and for that reason it becomes neces
ment. More speci?caly, the temperature at the hot blast
sary to cool the burner shut-off valve while the stove is
valve when a stove is “On Blast” is often in the area
in the “On Blast” condition. Toward that end, there is
of 1000" C. The heat at the hot blast valve is therefore 50 provided a conduit 30 through which some of the cold
transmitted to the burner shut-off valve when the latter
air passing through cold blast valve 24 is bypassed and
is in close proximity thereto. This resulting temperature
introduced into the burner shut-off valve 16, as best seen
rise at the burner shut-off valve is highly undesirable,
in FIGS. 1 and 2.
‘for obvious reasons, and it therefore ‘becomes necessary
Referring to FIG. 3, there is shown on an enlarged
to provide means for cooling the burner shut-off valve, 55 scale the gas shut-off valve 16 into which the cold air is
and particularly the valve plate thereof. Conventional
introduced. Gas shut-off valve 16 comprises an upper
cooling means for performing this function are well
housing 132 which houses a link 34, operated by an elec~
known, such as water cooling in the usual way. These
trical drive unit 36. Linkage 34 is operatively connected
conventional cooling means, however, have proved to
to valve plate ‘38 for raising and lowering the same in open
be costly and relatively cumbersome.
It is therefore an object of the present invention to
provide new and improved means for cooling the burner
shut-off valve of a hot blast stove.
60
ing and closing, respectively, the gas shut-off valve. As
shown in FIG. 3, the valve plate 38 is in the closing posi
tion thereof. Bypass conduit 36 terminates in a nozzle
type part 46* which passes through an opening in upper
Another object is the provision in a hot blast stove
housing 32. As shown in FIG. 3, all the cold air by
of means for air-cooling the burner shut-off valve, utiliz 65 passed through conduit 30‘ enters upper housing 32 and
ing air from the cold blast main for the stove.
passes through the stove side of valve plate 38, cooling the
Another object is the provision of means for cooling
same. Thereafter, this cooling air enters the stove proper
the burner shut-off valve by automatically introducing
10, cooling burner head ‘39 of stove 10, the path of the
cold blast into said valve only when the stove is in the
cooling air being indicated by the dashed arrows. It‘ will
“On Blast” condition.
be noted that the supply of air passing through conduit
The above and other objects, features and advantages
30 for cooling valve 16, originates from the cold blast
of the present invention will be more fully understood
main 22. More speci?cally, this supply of air comes from
3,051,463
3
4
cold blast main 22 and passes through cold blast valve
24 before being bypassed in conduit 30‘. In this way,
cold air is fed to the burner shut-off valve only when cold
Having ‘thus described my ‘invention, what I claim and
desire to secure by Letters Patent, is:
1. In a hot blast stove adapted to supply hot blast to a
blast furnace and being periodically changed between an
blast valve 24 is open. This condition occurs only when
“On Gas” condition thereof in which the stove checker
the stove is “On Blast,” and that is the only time when it
work is heated by the combustion of an air-gas mixture
is desired to have the burner shut-off valve cooled in the
and an “On Blast” condition thereof in which cold air is
manner indicated above. When stove 10 is in the “On
introduced into the stove, passes by the checker work to
Gas” condition, cold blast valve 24 is necessarily closed
be heated thereby, and exits from the stove as hot blast
and burner shut-oif valve 16 is open to permit the air and
gas mixture‘ coming from conduits 12 and 14 to pass 10 destined for the blast furnace, said stove having a cold
blast valve through which said cold air originating from
therethrough on the way to the stove where such mixture
a cold blast main passes before entering the stove and a
is consumed. Thus it is seen that providing cooling air as
hot blast valve through which the air heated by the checker
described above can occur only at a time when stove 10
work exits the stove when :the stove is in the “On Blast”
is “On Blast.” This is a safety precaution which is ab
solutely necessary, and which is obtained automatically in 15 condition, said stove also having a burner shut-off valve
through which an air-gas mixture enters the stove, when
the arrangement in accordance with the invention. In
actual practice, the respective valves of a stove are inter
the latter is in the “On Gas” condition, where combustion
thereof takes place for heating said checker work; the im
provement comprising means for cooling the burner shut
determined sequence whereby the cold blast valve of the
stove is opened only after the burner shut-off valve has 20 off valve, said cooling means comprising conduit means
having an inlet adapted to be in ?uid communication with
been closed. An apparatus for interlocking the valves of
a stove in this manner is fully disclosed in Patent No.
said cold blast main through which cooling air from the
cold blast main is introduced and having an outlet con
2,931,635, issued April 5, 1960, and assigned to the as
signee hereof. As a further safety device, bypass conduit
nected to said burner shut-off valve through which said
30 may be provided with a one-Way valve 42 to prevent 25 cooling air is introduced into the burner shut-off valve
any back ?ow of gas, when the stove is “On Gas,” from
for cooling the latter, and means for preventing said cool
the burner through conduit 30 into the stove, underneath
ing air from being introduced into said burner shut-off
the checkerwork, and out through the chimney valve into
valve at any time that the latter is open and has an air-gas
the stack. The cooling air which is forced into burner
mixture passing therethrough.
shut-0E valve 16 through conduit ‘30 while the stove is
2. In a hot blast stove adapted to supply hot blast to a
“On Blast,” enters stove 10. This cooling air is heated
blast furnace and being periodically changed between an
by the hot checker work 18 and then exits through the hot
“On Gas" condition thereof in which the stove checker
blast valve 26, in the same way as the bulk of cold air
work is heated by the combustion of ‘an air-gas mixture
which is introduced into the stove through cold blast valve
and an “On Blast” condition thereof in which cold air is
24 at 25.
35 introduced into the stove, passes by the checker work to
The amount of cold blast going into a stove through
be heated thereby, and exits from the stove as hot blast
point 25 is determined by the heat requirements of such
destined for the blast furnace, said stove having a cold
stove. What is of great import in the cooling means for
blast valve through which said cold air originating from
the burner shut-off valve, according to the invention, is
a cold blast main passes before entering the stove and a
the fact that the amount of cold air bypassed through con
hot blast valve through which the air heated by the checker
duit 30 is a function of the amount of cold blast fed into
work exits the stove when the stove -is in the “On Blast”
the stove. In this way, it will be seen that the cooling sys
condition, said stove also having a burner shut-0E valve
tern is a self-regulating one. More speci?cally, if more
through which an air-gas mixture enters the stove, when
cold blast is introduced into the stove for purposes of being
the latter is in the “On Gas” condition, where combustion
heated and becoming hot blast, then similarly more cold 45 thereof takes place for heating said checker work; the
air will be bypassed in conduit 30‘ for cooling the burner
improvement comprising means for cooling the burner
shut-off valve 16 and more particularly, for cooling valve
shut-off valve, said cooling means comprising conduit
plate '38 and upper housing 32 thereof, as well as burner
means having an inlet adapted to be in ?uidcommunica
head 39. The cooling system, therefore, is seen to be
tion with said cold blast main through which cooling air
automatically self-regulating and also automatically placed
from the cold blast main is introduced and having an out
in operation when the need for cooling arises. In other
let connected to said burner shut-01f valve through which
words, as soon as stove 10 goes into the “On Blast” con
said cooling air is introduced into the burner shut-off
dition, cold air is available in proportion to the heat re
valve for cooling the latter, said conduit means inlet be
quirements of the stove, for cooling the burner shut-0E
ing disposed between the cold blast valve and the stove
valve.
55 whereby said cooling air is introduced into said burner
Itis therefore seen that the cooling means in accord
shut-off valve only when said cold blast valve is open.
ance with the invention is extremely simple and economi
3. In a hot blast stove adapted to supply hot blast to a
locked so that the valves of a stove are operated in a pre
cal in-construction in that it utilizes as the cooling me
dium the same air which is made available from the cold
blast furnace and being periodically changed between an
blast main during the normal operation of the stove. Fur
work is heated by the combustion of an air-gas mixture
“On Gas” condition thereof in which the stove checker
thermore, the cold blast valve which is part of the stove
system now serves the additional function of controlling
the cold air to be furnished as the cooling medium for the
hot blast valve. The resulting simplicity and economy
of this construction, together with the automatic regulat
ing and safety features thereof render the system im
mensely valuable for performing its intended function.
While I have shown and described the preferred em
bodiment of my invention, it will be understood that the
invention may be embodied otherwise than as herein spe
ci?cally illustrated or described, and that in the illustrated
embodiment certain changes in the details of construction
and in the form and arrangement of parts ‘may be made
and an “On Blast” condition thereof in which cold air is
introduced into the stove, passes by the checker Work to
be heated thereby, and exits from the stove as hot blast
destined vfor the blast furnace, said stove having a cold
65
blast valve through which said cold air originating from
a cold blast main passes before entering the stove and a
hot blast valve through which the air heated by the check
er work exits the stove when the stove is in the “On Blast”
condition, said Steve also having a burner shut-0E valve
through which an air-gas mixture enters the stove, when
the latter is in the “On Gas” condition, Where combus
tion thereof takes place for heating said checker work;
the improvement comprising means for cooling the burner
shut-off valve, said cooling means comprising conduit
without departing from the underlying idea or principles
of this invention within the scope of the appended claims. 75 means having an inlet adapted to be in ?uid communica
3,051,463
.
tion with said cold blast main through which cooling air
from the cold blast main is introduced and having an out
let connected to said burner shut-off valve through which
said cooling air is introduced into the burner shut-off valve
for cooling the latter, and means in said conduit means to
prevent any ?ow therein in the direction of said inlet, and
means for preventing said cooling air from being intro
duced into said burner shut-01f valve at any time that the
latter is open and has an air-gas mixture passing there
through.
v
t
6
,
01f valve at any time that the latter is open and has an air
gas mixture passing therethrough.
6. In a hot blast stove adapted to supply hot blast to a
blast furnace and being periodically changed between an
“On Gas” condition thereof in which the stove checker
work is heated by the combustion of an air-gas mixture
and an “On Blast” condition thereof in which cold air is
introduced into the stove, passes by the checker work to
be heated thereby, and exits from the stove as hot blast
destined ‘for the blast furnace, said stove having a burner
head, said stove having a cold blast valve through which
said cold air originating from a cold blast main passes be
fore entering the stove and a hot blast valve through
_ which the air heated by the checker work exits the stove
and an “On Blast” condition thereof in which cold air 15 when the stove is in the “On Blas ” condition, said stove
also having a burner shut-0E valve through which an air
is introduced into the stove, passes by the checker work to
gas mixture enters the stove, when the latter is in the “On
be heated thereby, and exits from the stove as hot blast
Gas” condition, where combustion thereof takes place for
destined for the blast furnace, said stove having a cold
heating said checker work, said burner shut-off valve hav
blast valve through which said cold air originating from a
cold blast main passes before entering the stove and a 20 ing a valve plate, said cold blast valve and hot blast valve
being open and said burner shut-off valve being closed
hot blast valve through which the air heated by the checker
when the the stove is “On Blast,” said cold blast valve and
work exits the stove when the stove is in the “On Blast”
hot blast valve being closed and said burner shut-oil? valve
condition, said stove also having a burner shut-off valve
being open when the stove is “On Gas”; the improvement
through which an air-gas mixture enters the stove, when
the latter is in the “On Gas” condition, where combustion 25 comprising means for cooling the burner shut-o?? valve,
said cooling means comprising conduit means having an
thereof takes place for heating said checker work; the im
inlet adapted to be in ?uid communication with said cold
provement comprising means for cooling the burner shut
blast main through which cooling air from the cold blast
off valve, said cooling means comprising conduit means
main is introduced and having an outlet connected to said
having an inlet adapted to be in ?uid communication with
said cold blast main through which cooling air from the 30 burner shut-off valve through which said cooling air is in
troduced into the burner shut-off valve for cooling the
cold blast main is introduced and having an outlet con
latter, and means for directing said introduced cooling air
nected to said burner shut-off valve through which said
past the stove side of the burner shut-off valve plate, past
cooling air is introduced into the burner shut-01f valve for
the
burner head, and into the stove where said introduced
cooling the latter, said conduit means inlet being disposed
between the cold blast valve and the stove whereby said 35 air is heated by the checker work and exits as hot blast
4. In a hot blast stove adapted to supply hot blast to a
blast furnace and being periodically changed between an
“On Gas” condition thereof in which the stove checker
work is heated ‘by the combustion of an air-gas mixture
cooling ‘air is introduced into said burner shutoif valve
only when said cold blast valve is open, and means in said
conduit means to prevent any flow therein in the direction
of said inlet.
5. In a hot blast stove adapted to supply hot blast to a
blast furnace and being periodically changed between an
“On Gas” condition thereof in which the stove checker
work is heated by the combustion of an air-gas mixture
through the hot blast valve, said conduit means inlet being
disposed between the cold blast valve and the stove where
by said cooling air is introduced into said burner shut
off valve only when said cold blast valve is open, when
the stove is in the “On Blast” condition.
7. In a hot blast stove adapted to supply hot blast to
a blast furnace ‘and being periodically changed between
an “On Gas” condition thereof in which the stove checker
work is heated by the combustion of an air-gas mixture
and an “On Blast” condition thereof in which cold air is
introduced into the stove, passes by the checker Work to
be heated thereby, and exits from the stove as hot blast
destined for the blast furnace, said stove having a cold
and an “On Blast” condition thereof in which cold air is
introduced into the stove, passes by the checker work to be
heated thereby, and exits from the stove as hot blast des
tined for the blast furnace, said strove having a burner head,
said stove having a cold blast valve through which said
blast valve through which said cold air originating ‘from
cold :air originating from a cold blast main passes before
entering the stove and a hot blast valve through which the 50 a cold blast main passes before entering the stove and a
hot blast valve through which the air heated by the checker
air heated by the checker work exits the stove when the
Work exits the stove when the stove is in the “On Blast”
stove is in the “On Blast” condition, said stove also hav
condition, said stove also having a burner shut-off valve
ing a burner shut-off valve through which an air-gas mix
through
which an air-gas mixture enters the stove, when
ture enters the stove, when the latter is in the “On Gas”
the latter is in the “On Gas” condition, where combus
condition, where combustion thereof takes place for heat
ing said checker work, said burner shut—off valve having
tion thereof takes place for heating said checker work,
said burner shut-off valve having a valve plate, said cold
blast valve and hot blast valve being open and said burn
being open ‘and said burner shut-off valve being closed
er shut-cit being closed when the stove is “On Blast,”
when the stove is “On Blast,” said cold blast valve and hot
said cold blast valve and hot blast valve being closed and
60
blast valve being closed and said burner shut-off valve be
said burner shut-oif valve being open when the stove is
ing open when the stove is “On Gas”; the improvement
“On Gas”; the improvement comprising means for cooling
comprising means for cooling the burner shut~o? valve,
the burner shut-off valve, said cooling means comprising
said cooling means comprising conduit means having an
conduit means having an inlet adapted to be ‘in fluid com
inlet adapted to be in fluid communication with said cold 65 munication with said cold blast main through which cool
blast main through which cooling air from the cold blast
ing air from the cold blast main is introduced and having
main is introduced and having an outlet connected to said
an outlet connected to said burner shut-off valve through
which said cooling air ‘is introduced into the burner shut
burner shut-off valve through which said cooling air is in
oif valve ‘for cooling the latter, and means for directing
troduced into the burner shut-off valve for cooling the lat
said introduced cooling air past the stove side of the
ter, and means for directing said introduced cooling air
burner shut-‘0E valve plate and into the stove where said
past the stove side of the burner shut-off valve plate, past
introduced air is heated by the checker work and exits as
the burner head, and into the stove where said introduced
hot blast through the hot blast valve, and means in said
air is heated by the checker work and exits as hot blast
conduit means to prevent any ?ow therein in the direc
through the hot blast valve, and means for preventing said
cooling air from being introduced into said burner shut 75 tion of said inlet.
a valve plate, said cold blast valve and hot blast valve
3,051,463
7
8. In a hot blast stove adapted to supply hot blast to a
blast furnace and being periodically changed between an
“On Gas’? condition thereof in which the stove checker
work is heated by the combustion of an air-gas mixture
8
vfor cooling the burner shut-elf valve, said cooling means
comprising conduit means having an inlet adapted to be
in ?uid communication with said cold blast main through
which cooling air ‘from the cold blast main is introduced
and an “On Blast” condition thereof in which cold air
is introduced into ‘the stove, passes by the checker work
and having an outlet connected to said burner shut-0E
to be heated thereby, and exits from the stove as hot
blast destined for the blast furnace, said stove having a
cold blast valve through which said cold air originating
from a cold blast main passes before entering the stove
and a hot blast valve through which the air heated by the
burner shut-off valve for cooling the latter, and means for
directing said introduced cooling air past the stove side
of the burner shut~olt valve plate and into the stove where
said introduced ‘air is heated by the checker work and
checker work exits the stove when the stove is in the “On
valve through which said cooling air is introduced into the
exits as hot blast through the hot blast valve, said con
duit means inlet being disposed between the cold blast
valve and the stove whereby said cooling air is introduced
into said burner shut-off valve only when said cold blast
valve is open, when the stove is in the “On Blast” condi~
Blast” condition, said stove also having a burner shut
off valve through which ‘an air-gas mixture enters the
stove, when the latter is in the “On Gas” condition, where
combustion thereof takes place for heating said checker
tion, and means in said conduit means to prevent any
work, said burner shut-off valve having a valve plate, said
?ow therein in the direction of said inlet.
cold blast valveyand hot blast valve :being open and said
References Cited in the ?le of this patent
burner shut-off valve being closed when the stove is “On
Blast,” said cold blast valve and hot blast valve being 20
UNITED STATES PATENTS
closed and said burner shut-o? valve being open When the
1,768,880
Beardsley ____________ __ July 1, 1930
stove is “On Gas”; the improvement comprising means
2,048,696
Hel-lan ______________ __ July 28, 1936
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