Improvements in Rotary or Revoluble Furnaces or Kilns for Burning Cement, Lime and like Materials.
Year: 1899

page_text: Date of Application, 17th June, 1899-Accepted, 19th Aug., 1899
CUALI LEIE DIEVITICAL
Improvements in Rotary or Revoluble Furnaces or Kilns for Burning
Cement, Lime and like Materials.
I, FRIEDRICH C. W. TIмм, of 16, Oberstrasse, Hanover, in the Empire of
Germany, Engineer, 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:.
-
Revoluble furnaces for burning cement consist of a fireclay cylinder which is
surrounded by an iron casing. When the goods have been sufficiently fired or
finished in this cylinder they bake fast on to the walls, so that there is only the
option of either not quite finishing the substances and thus avoiding the baking-
on, or of taking the baking-on as an unavoidable necessity. Against this there
is only one means namely a thorough cooling of the walls of the furnace or kiln.
This invention has for its object an improved rotary or revoluble furnace
specially adapted for utilising this means.
The furnace consists of an iron or steel drum which may be left entirely
This
without a fireclay lining or be provided with one of small thickness.
drum is surrounded at a certain distance by a second closed iron casing which
travels round with it. Cool air or other suitable cooling material is forced
through the. corresponding cylindrical annular chamber by means of a suction
or blast device.
In the accompanying drawings,
Figure 1 is a longitudinal section of this improved kiln;
Figure 2, a cross section;
Figures 3 and 4 are detail views.
The material to be
The
b is the inner and c the outer casing of the furnace.
burned falls through a preliminary heater a and passes from thence into the
revolving drum which is set at an inclination. The firing is assumed to be
effected by means of a gas generator in such a way that the flame emerging from
a nozzle e strikes against the revolving material which is to be burned.
means for cooling the furnace flows then in the direction indicated by the arrows.
Care must therefore be taken that the drum does not bend between its supports
and that when in a heated condition the necessary momentum for producing its
revolution is transmitted to it, that is to say, that it does not revolve by itself.
Further care must be taken that an expansion of the drum furnace in the
direction of its longitudinal axis and also radially can take place without damage.
This is attained in the following manner:-
On the inner side of the supporting or running rings h, three of which are
shown in Figure 1, and of which the centre one is used for driving, iron supports t
are fixed which have a cylindrical base formation, Figure 2. The drum furnace
rests against the inner flange faces of these supports in such a way that each
time that a support is in the lowest position during the rotation the drum rests
thereon. Any rotation of the drum inside the series of supports may be
prevented by projections d, Figure 2. If it be desired that the part of the
drum which is uppermost at the time shall also be supported by suspension by

page_text: the support which is at the time uppermost, this can also be attained by suitably
engaging the projections d over both arms of the support flanges, as shown in
Figure 3. If no further attachment between the furnace wall and the support
be employed; free opportunity is afforded for the longitudinal expansion of same.
The radial expansion may however take place by a bulging out arising seg-
mentally between each two supports. This would not be possible if the travel-
ling or bearing rings directly enclosed the drum casing.
The cooling medium must be conveyed from the cylindrical annular chamber
into a stationary also annular chamber. This is done preferably by connecting
flange rings 7 (Figures 1 and 4) which bear or rub against fixed cylindrical pro-
jections of the end chamber or vice versa. The medium may be conveyed in
any suitable manner further from the annular chamber thus formed.
The intro-
duction of the cooling medium into the cooling casing may take place in similar
manner.
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 revoluble furnace or firing kiln for cement, lime and like substances
consisting of a metal cylinder with or without a comparatively thin lining and
surrounded by a second cylinder, a cooling medium which acts on the kiln walls,
being introduced to flow between the two cylinder walls, with the object of
preventing the material to be burnt from baking on to the inner walls of the
kiln by a successful cooling of the kiln walls, substantially as described.
2. A revoluble furnace or firing kiln of the kind described characterized by
supports being located in the supporting or running rings with the outer casing
arranged in separate cylindrical segments between said supports which however
enclose the furnace casing in such a way that they prevent its bulging outward
or inward whilst admitting its longitudinal expansion, and giving room for its
radial expansion by allowing seginental bulgings between each two supports,
substantially as described.
3. A revoluble furnace or firing kiln of the kind described, characterized by
the revoluble casing surfaces being provided with flange rings to bear or rub
against cylindrical projections of a stationary annular chamber or vice-versa
with the object of conveying the cooling medium from the revolving annular
cooling chamber into the stationary annular chamber, substantially as described.
Dated this 16th day of June 1899.
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Agents for the Applicant.