A METHOD OF UTILIZING THE HEAT OF CEMENT KILN GASES
Year: 1877

page_text: LETTERS PATENT to Carl Pieper, of Dresden and Berlin, for the Invention of
"A METHOD OF UTILIZING THE HEAT OF CEMENT KILN GASES."
▲ com-
munication from Fritz Schott, of Heidelberg, Baden, and August Nagel and
Reinhold Kaemp, of Hamburg, Germany.
Sealed the 24th May 1878, and dated the 29th November 1877
PROVISIONAL SPECIFICATION left by the said Carl Pieper at the Office
of the Commissioners of Patents on the 29th November 1877.
CARL PIEPER, of Dresden and Berlin. "A METHOD OF UTILIZING THE HEAT
OF CEMENT KILN GASES." A communication from Fritz Schott, of Heidelberg,
Baden, and August Nagel and Reinhold Kaemp, of Hamburg, Germany.
The object of this Invention is to utilize the heat of cement kiln gases in a direct
and more effective manner than by the methods hitherto applied. Usually these kilns
are charged with the prepared material for making cement, and the moisture con-
tained, in the same is evaporated at the beginning of the burning process.
Subsequently the material settles considerably on account of its shrinking and of
the consumption of the layers of fuel, so that the upper part of the kiln becomes
empty. At the same time the temperature of the combustion gases passing upward
rises to a considerable degree. For utilizing this heat, several attempts have been
made to draw off the gases as is done with blast furnaces, but comparatively with
ill success, caused by the interruptions in the working of the kiln and by the lower,
and moreover varying temperature of the gases from the same..
According to the method which I have invented, the substances to be dried or
heated are introduced into the upper part of the kiln, after the materials exposed to
the burning process have settled to a sufficient amount. For this purpose the said
substances, especially raw materials for making cement, are placed on trucks, or
platforms, which are lowered into the kiln by chains and suitable, mechanism, and

page_text: openings are provided in the walls of the kiln for drawing the trucks or platforms
out again.
Also, rails may be arranged within the kiln for trucks to run on; several tiers
of trucks or platforms can thus be introduced into the kiln at once.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Carl Pieper in the Great Seal Patent Office on the 24th May 1878.
CARL PIEPER, of Dresden and Berlin. "A Method of Utilizing the Heat of
CEMENT KILN GASES." A communication from Fritz Schott, of Heidelberg,
Baden, and August Nagel and Reinhold Kaemp, of Hamburg, Germany.
The object of this Invention is to utilize the heat of cement kiln gases in a direct
and more effective manner than by the methods hitherto applied. Usually these
kilns are charged periodically with the prepared material for making cement, and
the moisture contained in the same is evaporated at the beginning of the burning
process.
Subsequently the material settles considerably on account of its shrinking and of
the consumption of the layers of fuel, so that the upper part of the kiln becomes
empty. At the same time the temperature of the combustion gases passing upward
rises to a considerable degree. For utilizing this heat, several attempts have been
made to draw off the gases, as is done with blast furnaces, but with comparatively
little success, which may be accounted for by the interruptions in the working of
the kiln, and by the lower, and moreover varying temperature of the gases from
the same.
According to the method which my correspondents have invented, the substances
to be dried or heated are introduced into the upper part of the kiln after the
materials exposed to the burning process have settled to a sufficient amount.
For
this purpose the said substances, especially raw materials for making cement,
are placed on trucks or platforms which are lowered into the kiln by chains and
suitable mechanism, and openings are provided in the walls of the kiln for drawing
the trucks or platforms out again.
Also, rails may be arranged within the kiln for trucks to run on; several tiers of
trucks or platforms can thus be introduced into the kiln at once.
On the annexed Sheet of Drawing, two different arrangements are represented for
carrying out the described Invention.
Fig. 1 is a vertical, and Fig. 1a a horizontal section of a cement kiln, in the upper
part of which two or more lines of rails are arranged one above the other. On these g
rails the trucks a and a', loaded with the material to be dried, can be conveyed into
the kiln and out of the same. b is the opening in the wall of the kiln, which can
be closed by a sliding door c.
Fig. 2 represents an outside view, Fig. 2 a plan, Fig. 3 a vertical section, and
Fig. 3ª a horizontal section of a modified arrangement, in which a number of 4
platforms are attached to each other by links or chains f, and lowered into

page_text: the top part of the kiln by suitable machinery, such as represented in the
Drawing. These platforms are successively introduced by either of the upper
doors g, J.
The material on the lowest platform having become dry, the latter is
let down on a truck e, and after being detached from the chain is drawn out of the
kiln by the door h.
The process of drying by means of the described arrangements may begin after
the vapours have ceased to rise from the kiln, and when the combustion gases have
assumed a sufficiently high temperature. At this time the lower opening h for
removing the platforms, will have become free, so that its door can be opened.
The drying may be continued until the burnt cement, which still gives off much
heat, has completely been drawn out of the kiln.
Having thus described the object and nature of this Invention, and the manner
in which it is or may be performed or put in practice, I claim as the essential
feature of the same, the method of utilizing the heat of cement kiln gases by introducing
the materials to be dried or heated into the upper part of the kiln, after the settling
of the cement, substantially as and for the purpose specified.
In witness whereof, I, the said Carl Pieper, have hereunto set my hand and
seal, this Ninth day of May, in the year of our Lord One thousand eight
hundred and seventy-eight.
CARL PIEPER. (L.S.)