Process of and Apparatus for Burning Cement, Lime, and the like in Blast Furnaces.
Year: 1899

page_text: Date of Application, 25th Feb., 1899
Complete Specification Left, 21st Nov., 1899-Accepted, 6th Jan., 1900
* PROVISIONAL SPECIFICATION.
A Process of and Apparatus for Burning Cement, Lime, and the like in
Blast Furnaces.
I, PAUL RUNGE, of No. 1, Dorfstrasse, Jatznick, Vorpommern, in the Kingdom
of Prussia and Empire of Germany, Manager, do hereby declare the nature of
this invention to be as follows:-
In burning cement, lime and the like in blast furnaces, the difficulty has
always presented itself that the material has become baked upon the walls of
the furnace in that portion of the same in which the stalactite formation of the
cement, which is necessary to ensure successful burning, takes place, thereby in
many ways exercising a prejudicial effect upon the working of the furnace.
Attempts have been made to prevent the material from being caused to adhere
in this manner, by arranging a cooling pipe around the outer wall of the furnace,
and by injecting water within the furnace upon the completion of the burning.
operation. This procedure, however, presents serious defects from two points-
of view. In the first place it is not possible to produce efficient cooling through
the stone walls of the furnace, which are bad conductors, and in the second
place, the water striking against the highly heated inner walls of the furnace
rapidly deteriorates them.
This invention relates to a method of and device for enabling these defects to
be obviated. It consists in providing within the furnace, at the zone of highest
temperature, and consequently where dropping of the material takes place, a
cooling device which here forms the furnace wall itself, thereby entirely obviating
any adhesion of the material by baking.
The apparatus comprises an admission aperture for the material to be burned,
a preliminary heating chamber confined laterally by the Chamotte lining. In.
this latter are situated the apertures of six passages arranged around the furnace
and serving to supply fuel when necessary.
Below this is the dropping zone of the material to be burned, the
walls of which are constructed of a material which is a good conductor of heat
such as iron or other suitable metal, and form a cooling chamber. It consists
in one form of an annular iron vessel having double walls, closed below and
open above and provided with an admission pipe, a discharge pipe, and a water
gauge. This cylinder is built into the furnace in such a manner that its upper
edge remain free, so that when it becomes filled the water may flow over the
edge and sprinkle the material in the furnace. Beneath this cooling chamber
the furnace widens out in such a manner as to facilitate the dropping of the
material from the dropping zone so that it may not be liable to adhere to the
walls after leaving the cooling chamber.
The operation of une apparatus is as follows:-
Through the admission aperture the material to be burned is arranged in
layers with the fuel and enters the preliminary heating chamber. The supply
of water to the annular iron rossol is regulated in such a manner that it is

page_text: completely filled, but so that no overflow takes place. Whilst the material is
slowly falling in the dropping zone and becoming heated to such an extent that
partial forming of stalactites takes place, owing to the cooling effect produced
upon the walls, adhesion of the material upon then by baking cannot take place.
When it is considered that the burning operation has been carried far enough
the supply of water is increased so as to produce an overflow into the furnace.
As the cylinder is built into the furnace in such a manner that its edge is
exactly horizontal, this overflow takes places-uniformly around its circumference,
the water flowing over the metal walls, thereby sprinkling the stalactiform cement
and absolutely obviating any possibility of its becoming baked upon the walls.
After this has been effected, the cement is withdrawn at the foot of the furnace
in the usual manner and the sprinkled mass readily follows. As the cooling
chamber, even when the water boils, can never be heated beyond 100° C., and
seeing that the furnace walls flare outwardly beneath the cooling chambers the
interior of the furnace cannot possibly be injured by the water flowing into the
furnace.
'T'
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.
A Process of and Apparatus for Burning Cement, Lime, and the like in
Blast Furnaces.
I, PAUL RUNGE; of No. 1, Dorfstrasse, Jatznick, Vorpommern, in the Kingdom
of Prussia and Empire of Germany, Manager, do hereby declare the nature of
this invention and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement:-
In burning cement, lime and the like in blast furnaces, the difficulty always
met with has been that the material becomes baked to the walls of the furnace
in that portion of the same in which, the sintering of the cement, which is
necessary to ensure successful burning takes place, thereby in many.
exercising a prejudicial effect upon the working of the furnace.
T
ways
Attempts have been made to prevent the material from being caused to adhere
in this manner, by arranging a cooling pipe around the outer wall of the furnace,
and by injecting water within the furnace after the completion of the burning
operation. This procedure, however, presents serious defects from two points
of view. In the first place it is not possible to produce efficient cooling through
the stone walls of the furnace, which are bad conductors of heat, and in the second
place the water striking against the highly heated inner walls of the furnace
rapidly deteriorates them.
This invention relates to a method of and device for enabling these defects to
be obviated. It consists in providing within the furnace, at the zone of highest
temperature, and consequently where sintering of the material takes place, a
cooling device which here forms the furnace wall itself, thereby entirely obviating
any adhesion of the material. by baking.
The invention is illustrated in the accompanying drawing in which :
Figure 1 is a central section through a blast furnace with my improved 'device.
applied thereto, and
Figure 2 is a perspective view of the cooling chamber detached

page_text: Referring to the said drawing A is the admission aperture for the material to
be burned, B is the preparatory heating zone confined laterally by the Chamotte
lining in which are provided, apertures communicating with channels K
arranged around the furnace and serving to supply fuel when necessary.
Dis the sintering zone of the material to be burned, the walls of which are
constructed of a material which is a good conductor of heat such as iron or other
suitable metal and form a cooling chamber F. It consists in the constructional
form shown in the drawing, of an annular iron vessel having double walls, closed
at the bottom and open at the top and provided with an admission pipe G, a
discharge pipe H, and a water gauge I. This cylinder is built into the furnace
in such a manner that its upper edge remains free, so that when it becomes filled
the water may flow over the edge and quench the material in the furnace.
Beneath this cooling chamber the furnace widens out in such a manner as to
facilitate the dropping of the material from the sintering zone so that it may
not be liable to adhere to the walls after leaving the cooling chamber.
The operation of the apparatus is as follows:
The material to be burned is fed through the apertures A in alternate layers
with the fuel, and enters the preparatory heating zone B. The supply of water
to the cooling chamber is regulated in such a manner that it is completely
filled, but so that no overflow takes place. Whilst the material is slowly falling
in the sintering zone and becoming heated to such an extent that partial sintering
of the same takes place, adhesion of the material to the walls by baking cannot
take place, owing to the cooling effect produced by the water. When it is
considered that the burning operation has been carried far enough the supply of
water is increased so as to produce an overflow into the furnace. As the cylinder
is built into the furnace in such a manner that its edge is exactly horizontal, this
overflow takes place uniformly around its circumference, the water flowing over
the metal walls, thereby quenching the sintered cement and absolutely obviating
any possibility of its becoming baked to the said walls.
After this has been effected the cement is withdrawn at the foot of the furnace
in the usual manner and the chilled cement readily follows. As the cooling
chamber, can never be heated beyond 100° C. even when the water boils, and
seeing that the furnace walls flare outwardly beneath the cooling chamber the
interior of the furnace cannot possibly be injured by the water flowing into the
furnace.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:-
_
1. A method of burning cement, lime and the like in a blast furnace charac-
terized by the fact that the material in the sintering zone is cooled by the walls
of a cooling chamber built into and forming part of the walls of the said zone
so as to prevent the baking of the material to the walls of the furnace, the
arrangement being such as to allow of water being caused to flow down the walls
at the completion of the process of burning, so as to quench the burnt cement in
the interior of the kiln.
2. A. furnace having its sintering zone cooled by water as claimed in Claim 1,
characterized by a cooling tank provided with an inlet and outlet pipe, permitting
of the flow of water into the kiln.
IT
0011
1000
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C,
Agents for the Applicant.