Year: 1895

page_text: Date of Application, 30th May, 1895-Accepted. 6th July, 1895

page_text: E is an open-ended cylinder, which is enclosed within the shell casting A., and
projects into each stuffing box B1 B2. The ends of this cylinder, which project into
the stuffing boxes, are preferably turned true externally, and the cylinder is suitably
mounted on the hollow axle or shaft E', which passes through the stuffing
boxes C C. The stuffing boxes are provided with asbestos rope packing, which
is inserted in the spaces e¹ e', and serves to make a gas and air-tight joint. The
axle E is mounted on anti-friction bearings F, carried by standards F' bolted
to the base plate, or in any other convenient manner, and rotary motion is
communicated to the axle by worm and worm wheel or other gearing F² operated
from any prime mover.
The cylinder E is set at a suitable inclination, and to overcome the end thrust,
I cause the closed lower end of the hollow axle E' to run in contact with an
anti-friction roller f carried by a massive casting G.
At its upper end, the axle E' turns in a stuffing box H, which may be formed in
one with the casing H' of a rotary fan or exhauster H2 mounted on the end of a
shaft H³, which has its bearings in a standard H4, and is driven by a pulley H' on
the end of the shaft. The casing H¹ is connected at bottom, or wherever the
outlet may be, with one side of a purifier J by a pipe, and to the other side of
the purifier may be connected a pump or second exhauster (not shown) in
communication with a holder or reservoir for the gas.
When the cylinder is of great length, it may be provided at the centre of its
length with a wheel K, which runs on antifriction rollers K', suitably carried,
and serves to support the cylinder at its centre, thus preventing sag or bending.
In operating the apparatus, a fire is lighted in the grate, the products of
combustion passing round outside the cylinder to the chimney A³, as seen in
Fig. 5.
The material to be dried, and from which the carbonic acid gas is to be driven
off, is fed into the hopper C2 in any convenient manner, and is allowed to flow out
of the hopper into the cylinder E at such a speed that the hopper will always
contain a sufficient quantity or head of pulverised material to form an air seal.
The cylinder is rotated and the material is taken up by internal fins E*, and
caused to gradually travel along the cylinder (in a manner well understood) to the
opposite end, whence it passes out by the spout D. The material falls into a
trough L provided with an Archimedian screw, which carries it forward to an
elevator (not shown), that conveys it to the calcining furnace or elsewhere. The
valve in the spout regulates the outflow, so that a sufficient quantity or head of
the material is contained in the spout, to form an air seal, as before mentioned with
respect to the supply hopper.
During its progress along the cylinder, the pulverized material becomes dry by
contact with the heated walls thereof, and carbonic acid gas is disengaged. This
gas is drawn off by the suction of the exhanster H2 through openings M formed in
the bollow axle, and is forced through the purifier J, from which it is passed to a
holder, for storage purposes.
The purifier J contains water to arrest particles of dust which may be drawn
with the gas, and the gas is caused to take a zigzag path by means of baffle plates,
which alternately stand out from and dip into the water.
By means of the above described apparatus, I provide for a continuous and
automatic feed and delivery of the material to be treated, and I prevent the
entrance of air to the cylinder, and the escape of the gas generated, except through
the hollow axle, notwithstanding the open ends of the cylinder.
It will be obvions that the cylinder may be heated, it desired, by either liquid or
gaseous fuel, though solid fuel is indicated in the drawings.
I am aware that an inclined open-ended cylinder has been used in calcining
cement-making material, and I therefore make no claim for such a cylinder per se.
I am also aware that ores have been desulphurized in an externally-heated rotating
cylinder mounted on a hollow perforated axle, through which the gases passed,
and I make no claim for a cylinder so heated and a perforated hollow axle so

page_text: employed, per se. I am also aware that gases have been drawn off from an ore
roaster, and passed through a purifier or condensing vessel, and I make no claim
for such a combination of parts, per se. nor do I make any claim for the combination
of an externally-heated roasting cylinder with a hollow axle, a condensing vessel,
and a pump; nor do I claim a continuous feed to and delivery from an open-ended
internally-heated cylinder, which I am aware has been used; but I am not aware
that it has ever been proposed to externally heat an open-ended cylinder, to and
from which there is a continuous feed and delivery, in such a manuer that the gases
given off from the material under treatment can be collected for future use, without
the admixture of air; and it is which constitutes the essential feature of my
invention, more especially for obtaining carbonic acid gas, but which may be also
used for obtaining other gases or vapors.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. An apparatus for drying cement-making and other carbonic acid containing
materials, and driving off and collecting, in the form of gas, the carbonic acid
contained therein, as shown and described, and consisting of a shell casting forming
a combustion chamber, a fire place within the shell, an inclined open-ended rotating
cylinder, stuffing boxes in the ends of the shell, into which the ends of the cylinder
project, a feeding hopper on one stuffing box and a delivery spout on the other,
regulating valves to the feeding hopper and the spout, whereby a head of the
material is maintained in the parts to form an air seal, a hollow perforated axle
on which the said cylinder is mounted, and through which the carbonic acid gas
generated is drawn off, an exhauster in connection with the end of the hollow
axle, and means for rotating the hollow axle, all combined and arranged
substantially as set forth.
2. An apparatus for obtaining carbonic acid and other gases or vapors from
cement-making and other materials, and consisting of an externally heated open-
ended cylinder, stuffing boxes to receive the open ends of the cylinder, means for
continuously feeding material to and delivering from the cylinder without
admitting air, means for drawing off from the cylinder the gases generated, and
means for rotating the cylinder in the stuffing boxes.
3. An apparatus for treating cement making and other materials, to obtain
carbonic acid therefrom, and consisting of an externally-heated open-ended cylinder,
stuffing boxes to receive the ends of the cylinder, means for drawing off the gases
generated, and means for rotating the cylinder in the stuffing boxes.
Dated this 28th day of May 1895.
NEWTON & SON,
Agents for the Applicant.